bureau of public enterprise - saitama prefecture of saitama prefecture and the saitama prefecture...

Saitama Prefecture Bureau of Public Enterprise

Saitama Prefecture's mascot, Kobaton

Table of Contents

■Overview of Saitama Prefecture and the Saitama Prefecture Bureau

of Public Enterprise .......................................................................................... 1

Overview of Saitama Prefecture ................................................................................................. 2

Overview of Saitama Prefecture Bureau of Public Enterprise .................................................... 3

■Water-Related Technologies of Companies in Saitama Prefecture .............. 7

[Water purification treatment-related technology]

No. 01 Maezawa Industries, Inc. - Hybrid membrane system - ................................................ 8

No. 02 Nissui Industry Corporation - Filter material recycle system - ........................................ 9

No. 03 Takemi Corporation - Eco-filtration system - ................................................................ 10

[Measuring instruments]

No. 04 DKK-TOA CORPORATION - Immersion type residual chlorine analyzer Model CWM-160E(S) - ...... 11

No. 05 DKK-TOA CORPORATION - Portable turbidity meter Model TB-31 - ......................... 12

[Valves]

No. 06 Maezawa Industries, Inc. - Lo-Tm - ............................................................................. 13

No. 07 HANNO CO., LTD. - Valve production for water works - ............................................. 14

[Leak detector]

No. 08 FUJI TECOM INC. - Leak noise level logger and digital sound detector - ................... 15

[Operation and control technology]

No. 09 Kanto Service - Water purification plant operation and manipulation service - ............ 16

[Other technology]

No. 10 NAOJI Chemical - Flocculant for water purification PSI (polysilica iron) and recycle model of generated soil - .... 17

No. 11 Totetsu MFG. Co., Ltd. - Rainwater storage universal underground storage system - ................. 18

No. 12 Totetsu MFG. Co., Ltd. - Rainwater intake and initial purification technology - ............ 19

1

Overview of Saitama Prefecture and the Saitama Prefecture Bureau of Public

Enterprise

2

Saitama Prefecture is on the Kanto Plain, and the inland prefecture is surrounded by the Tokyo

metropolitan area and six other prefectures. The prefecture spreads about 103 km east to west and about

52 km north to south. The area is about 3800 square kilometers. About one-third of it is composed of

mountains and the remaining two-thirds are flats. The size corresponds to about one-hundredths of the

national land, and it is the 39th largest among 47 prefectures in Japan.

The population of Saitama Prefecture is about 7.2 million and the 5th largest among 47 prefectures in

Japan. While there are large heavily populated cities, some hilly and mountainous areas address

depopulation issues. There are a wide variety of industries from agriculture and manufacturing to services.

Thus, Saitama is a perfect microcosm of Japan, except for no access to the sea.

The climate is featured by hot, humid summers and dry northwesterly monsoons in winter. The good

climate to live causes relatively infrequent damage from wind and flood and comprises a large number of

clear days compared with other areas in Japan.

Saitama

Gunma

Chiba Tokyo

Tochigi

Kanagawa

Ibaraki

Yamanashi

Saitama Narita Airport

Haneda Airport

Tokyo

30minutes1hour

1.5hour

Prefectural Emblem

The emblem of Saitama Prefecture is a circle composed of 16 comma-shaped beads called magatama. Magatama were valued by people from ancient times as accessories. The circular magatama design represents the sun, development, passion, and vitality.

Saitama New Urban Center viewed from Shiba

River (Saitama city)

Location

Access

Overview of Saitama Prefecture

1.5 hours

3

The Saitama Prefecture Bureau of Public Enterprise implements the tap water supply service, the

Industrial water service and the regional development service.

I. Tap water supply service: Tap water is supplied to 58 cities and towns.

II. Industrial water service: Industrial water is supplied to business sites such as plants in 6

cities in the southeastern area of the prefecture.

III. Regional development service: Industrial complexes are developed and plotted out.

■ Service overview Saitama Prefecture founded the tap water supply service in 1963 in order to correspond to the water

demand due to population growth and rise in living standards as well as take measures to prevent

subsidence caused by overuse of ground water. Seeking surface stream water of rivers for the water

source, the Okubo Water Purification Plant started to supply water to the southern central area of the

prefecture in April 1968.

Later, in order to cope with the increasing water demand, the water supply areas were extended in turn

and new water purification plants were constructed. As of April 1, 2014, five water purification plants supply

about 1.75 million m3 of tap water per day to 58 cities and towns (55 groups). In addition, advanced water

purification treatment facilities have been operated in the Shin-Misato Water Purification Plant since April

2010.

Water purification plant Okubo Showa Gyoda Shinmisato Yoshimi Total

Start of Operation 1968 1976 1986 1990 2005 -

Existing Water

Purification Capacity

1,300,000 m

3/day

350,000 m

3/day

500,000 m

3/day

365,000 m

3/day

150,000 m

3/day

2,665,000 m

3/day

Total Length of Transmission Lines 771 km

Water Resources

Shimokubo Dam, Tonegawa Estuary Weir, Improved Agricultural Channels, Kasumigaura Aqueduct, Watarase Retarding Basin, Kusaki Dam, Kita-Chiba Aqueduct, Arima Dam, Naramata Dam, Urayama Dam, Arakawa Regulating Reservoir, Yanba Dam, Takizawa Dam, Kakkaku Dam, Gongendo Regulating Reservoir, and others

Water Rights 26.115 m3/s

Receiving of Water Organizations 55 Organizations

Population Served 7.16 million

Water Service Diffusion Rate 99.6 %

Water Supply Fee 61.78 JPY/m3

April 2014

Water Resources

Prefectural Purification Plant

Municipal Distribution Reservoirs (55)

Businesses

Homes

Bulk Water Supply

Overview of Saitama Prefecture Bureau of Public Enterprise

I. Tap water supply service

4

■ Service Areas

Shinmisato Water Purification Plant

(365,000m3/day)

Advanced water purification (Ozonation +

Biological activated carbon treatment)

Okubo Water Purification Plant

(1,300,000m3/day)

Showa Water Purification Plant (350,000m

3/day)

Gyoda Water Purification Plant (500,000m

3/day)

Yoshimi Water Purification Plant

(150,000m3/day)

Service Areas

Transmission

5

■ International engineering assistance The Saitama Prefecture Bureau of Public Enterprise started engineering assistance for the Provincial

Waterworks Authority of Thailand (PWA) in 2011 and has dispatched the staff and accepted the trainees to

aim at improvement in water treatment techniques in the water purification plants. It has participated in

JICA projects in Laos since 2012 and dispatched the staff in order to help improvement in the water

service administration performance. For assistance of companies in the prefecture, the overseas

expansion of companies is supported by participation in field surveys conducted by the company and an

evaluation committee of a demonstration project.

Staff dispatch to Thailand

(Participation in an evaluation committee of a

demonstration project of a company in the prefecture)

Staff dispatch to Thailand (Engineering assistance for the Thai PWA)

Know-how on large-scale project operation - The tap water supply service with the largest facility capacity in Japan is operated and stable

management has been maintained for more than 40 years.

- Advanced know-hows on planning necessary for supplying a huge amount of water and water

purification plant operation control have been obtained.

Know-how on water quality control - Each water purification plant conducts coliform and other bacteria tests and inspections on color,

turbidity and odor. In addition, the Water Quality Management Center carries out about 200 items

of detailed examination to confirm safety.

- The Water Quality Management Center obtained ISO 9001 certification in January 2006 to ensure

high reliability of water quality testing and Water Supply GLP accreditation for the 51 tap water

quality standard items in December 2013.

Efficient management - The percent of losses from water intake to supply (water supply to the cities and towns) is only

0.5 %, which means efficient water treatment.

- Population to supply water per staff member is 27,807, which is the largest number among water

work entities in Japan.

Water Supply GLP (Good Laboratory Practice) Water quality inspection departments of water work entities and the registration inspection agency use it to ensure accuracy and reliability

guarantee of tap water quality testing results.

6

The Saitama Prefecture Bureau of Public Enterprise started supplying industrial water in 1964. The

Kakinoki Water Purification Plant and the Okubo Water Purification Plant supply water to the business sites,

such as plants in six cities in the southeastern area of the prefecture where pumping industrial

groundwater is controlled, contributing to industrial development and

prevention of subsidence.

The Saitama Prefecture Bureau of Public Enterprise has developed 36 estates since 1964, including

industrial complexes, distribution business parks and residential estates, to contribute to regional

development. Two industrial complexes are currently prepared.

Tokyo

Industrial Parks

Expressways

Kakinoki Water Purification Plant

Sugito Industrial Park

Kuki - Shobu Industrial Park

Businesses

Factories Hospitals Shopping

Centers

Supply area: 6 cities, 153 business sites

Contract water amount: 195,280 m3/day

Contract charge: 22.53 yen/m3

April 2014

II. Industrial water service

III. Regional development service

7

Water-Related Technologies of Companies in Saitama Prefecture

8

No. 01 Maezawa Industries, Inc. - Hybrid membrane system -

■ Outline

- The original system of Maezawa Industries combines immersion MF membrane treatment with physicochemical treatment or biological oxidation to realize advanced separation involving dissolved components at low cost.

- When the raw water contains coloring organic matter, addition of powder activated carbon and combination with ion-exchange treatment led to more effective treatment than the procedure of coagulation plus membrane filtration.

- Ammoniacal nitrogen or low-concentration BOD components remaining in raw water can be removed by biological oxidization in the immersion tank.

- It allows advanced separation, including removal of dissolved components at low energy and high recovery rate compared with NF and RO. However, the condition of salts cannot be treated.

- The membrane filtration system adopts PTFE hollow fiber membranes. Since the PTFE hollow fiber membranes are original products in Japan and excellent in chemical resistance, the performance can be recovered by strong alkaline washing that is not applicable to membranes of other materials and operation of long-term stability is realized.

■ Applications

- Applicable to drinking water supply facilities and industrial water production facilities.

- It is employed in three water purification plants in Japan, including Takashima city, Shiga

prefecture. In addition, the technique is applied to reclamation facilities in a milk plant in

Japan and copper concentration of plating drain. The wastewater treatment in key

Japanese manufacturers utilizes the system.

- Supported by the NEDO project, a pilot plant was installed in the first water purification

plant in Amata Nakorn Industrial Estate in Thailand for the purpose of producing industrial

water (December 2013) and continuous water flow testing is currently conducted.

- Able to obtain quality utility water from severely polluted raw water at relatively low cost

with small energy.

- Especially effective for purification treatment of more polluted raw water by means of

excellent properties of the hollow fiber PTFE membranes.

■ Contact

膜ﾓｼﾞｭｰﾙ膜ﾓｼﾞｭｰﾙ

MF膜分離溶解性有機物：活性炭吸着、凝集、生物酸化

溶解性ﾏﾝｶﾞﾝ、ｱﾝﾓﾆｱ性窒素：化学酸化（生物酸化）

表流水

膜ろ過水

PTFE製中空糸膜

高度処理水＋ →

PAC粉炭

Cl2 ｴｱｰｽｸﾗﾋﾞﾝｸﾞ（間欠）

C o m p a n y : Maezawa Industries, Inc.

Business: Fabrication, sales and installation of water supply and sewerage system devices and

equipment

Address: Nakamachi 5-11, Kawaguchi-shi, Saitama-ken 332-8556 Japan

T E L : +81-48-253-0061 FAX: +81-48-253-0056

E-Mail: [email protected]

U R L : http://www.maezawa.co.jp/english/Mmain.html

Membrane module + MF membrane separation

→ Advanced treatment water

Soluble organic matter: Activated carbon adsorption, coagulation, biological oxidization Soluble manganese, ammoniacal nitrogen: Chemical oxidization (biological oxidization)

Surface stream water

Fine- sized coal

Surface stream water

Air scrubbing (intermittent)

PTFE hollow fiber membrane

9

No. 02 Nissui Industry Corporation - Filter material recycle system -

■ Outline

Features of filtration basin filter material recycle system

1. Safe operation any place. Only a space for two hoses is required. It works even in narrow,

high or underground places.

2. Integration of a series of works. Removal of the filter material, washing and screening can be

performed sequentially to shorten the construction period.

3. Conservation of resources. A tiny amount of industrial waste is generated from the filtration

sand and gravel to use.

Refre (recovery washing)

1. The recycle process removes adhered matter and useless coagulation, and efficient

manganese sand is obtained.

2. Unnecessary manganese layer is removed to extend the filtration sand life and the period

until the next rehabilitation work, leading to a drastic cost cutting for maintenance and

control.

3. The effective diameter and the uniformity coefficient can be arranged without changing the

particle size.

- Sales and installation of the slow filtration basin Zeputo (sand cleaner)

- Fabrication and installation of the filtration material dropout prevention net

- Overall maintenance of filtration basins, including piping and water-resistant coating

■ Applications - The filter material washing recycle systems for filtration basins were installed in water

purification plants in Japan, including Saitama Prefecture Okubo Water Purification Plant

and the water purification plant for the Ageo city east area in Saitama Prefecture.

- For water purification plants in Southeast Asian countries, the filter material recycle system

can be constructed as an alternative to filter material replacement work or a work for

maintenance and control. The company also provides overall maintenance, such as piping

and water-resistant coating. ■ Contact

C o m p a n y : Nissui Industry Corporation

Business: Filtration basin rehabilitation work, water treatment equipment, filter material analysis service

Address: Kawataya 3812, Okegawa-shi, Saitama-ken 363-0027 Japan

T E L : +81-48-787-7701 FAX: +81-48-787-7702


U R L : http://nissui-industry.co.jp

10

No. 03 Takemi Corporation - Eco-filtration system -

■ Outline

- The slow filtration system using biocenotic actions (biological purification method) purifies water.

- The only energy required for the filtration system is potential energy. - When water is taken from a river and the height is different, water flows down naturally

and no energy is required. - The filtration basin has a simple structure and it is hard to be broken and long-lasting,

which reduces the construction cost. - Water is purified by natural mechanisms and no chemicals such as coagulants are

used. - The facilities can be operated and controlled remotely without attendance of the

facility staff on site. - The electrical power necessary for remote control is obtained by photovoltaic or

hydraulic power generation to operate the facilities. No supply of electricity causes any problems.

■ Applications - Suitable for small to medium-scale suburban water purification plants. - Suitable for the installation environment with difficulty in electrical power supply. - Suitable for small to medium-scale entities that have a few professional engineers

and place heavy burden of control on the staff. ■ Contact

C o m p a n y : Takemi Corporation

Business: Design, installation, and management of eco-filtration, water supply facility works

Address: Sakasegawa 895-3, Minami-ku, Sakai-shi, Osaka-fu 590-0123 Japan [Headquarters]

(Kawataya 3812, Okegawa-shi, Saitama-ken 363-0027 Japan [Kanto business office])

T E L : +81-72-294-9801 FAX: +81-72-294-9802


U R L : http://eco-roka.jp/

監視カメラソーラーパネルＬＥＤ照明

原水

処理水

蓄電池

原水槽

制御盤

緩速ろ過槽

魚類センサー

チャージャ

粗ろ過槽

フィルター

通信装置

Solar panel

Raw water

Raw water

tank

Control panel

Charger Batteries

Communication device

LED illumination

Monitoring camera

Fish sensor

Filter Treated water

Coarse

filtration

tank

Slow

filtration

tank

11

C o m p a n y : DKK-TOA CORPORATION

Business: Manufacturing and sales of analytical instruments and industrial measuring instruments

Address: 29-10, 1-Chome, Takadanobaba, Shinjuku-ku, Tokyo 169-8648 Japan [Headquarters]

(Kitairiso 613, Sayama-shi, Saitama-ken 350-1315 Japan [Sayama Technical Center &

Research and Development Center])

T E L : +81-3-3202-0225 FAX: +81-3-3202-5685


U R L : http://www.toadkk.co.jp/english/index.html

No. 04 DKK-TOA CORPORATION - Immersion type residual chlorine analyzer Model CWM-160E(S) -

■ Outline

The detector is dropped in for measurement. Because pump circulation of sample

water is not required, no consumption of residual chlorine during flowing in the piping or

no delay of measurement is expected. The structure enables a slight adjustment of the

detector fixing position (water depth and position in the tank) to seek the best

measurement point.

Specifications

■ Applications

- Stable water quality monitoring is essential for proper administration and control of

residual chlorine concentration. A reliable residual chlorine analyzer is necessary in

order to supply safe tap water.

- Proper control of residual chlorine concentration is important as a measure for

quality of colored water. Therefore, adequate "water quality monitoring" leads to

suitable supply of water including the removal of manganese.

■ Contact

Measurement range 0 to 2 Measurement unit mg/L Mount method of detector Drop-in type, SUS316 Protection tube length 2.5 m (planned) Cable length 10 m

Transmitter

Detector

12

C o m p a n y : DKK-TOA CORPORATION

Business: Manufacturing and sales of analytical instruments and industrial measuring instruments

Address: 29-10, 1-Chome, Takadanobaba, Shinjuku-ku, Tokyo 169-8648 Japan [Headquarters]

(Kitairiso 613, Sayama-shi, Saitama-ken 350-1315 Japan [Sayama Technical Center &

Research and Development Center])

T E L : +81-3-3202-0225 FAX: +81-3-3202-5685


U R L : http://www.toadkk.co.jp/english/index.html

No. 05 DKK-TOA CORPORATION - Portable turbidity meter Model TB-31 -

■ Outline

The raw water turbidity of each water path is measured for use as an indicator of water

purification.

Specifications

■ Applications

- Since the turbidity of raw water always varies according to the weather and the

season, it is important to know the upstream turbidity numerically. The portable

device is easy to carry and has an immersible sensor for measurement.

■ Contact

Measurement range 0 to 80/800

Measurement unit mg/L

Standard substance Formazine

Detector Drop-in type

Cable length 11 m

Power supply Two AA alkaline/nickel-hydrogen batteries

13

No. 06 Maezawa Industries, Inc. - Lo-Tm -

■ Outline

- The butterfly valve with optimized toothed vane disc.

- Suppress cavitation with the toothed vane disc, converting the water flow into

multiple Jetstream to disperse energy causing damages.

- Stable throttling valve operation with its special designed disc enabling wide range

of flow control characteristics, which was difficult with the conventional disc design.

- Low-dynamic-torque for easy actuation even in the mid-opening angle.

■ Applications

- Suitable for flow control and pressure reduction

- High reliability with proven technology and operation records in the world.

- Standard Specification

Nominal Diameter: 100mm to 1500mm (available in all size up to around 2500mm)

Fluid: Water

Maximum operation pressure: 1.0MPa (1.6MPa)

■ Contact

弁棒

弁体

くし歯

弁箱

C o m p a n y : Maezawa Industries, Inc.

Business: Fabrication, sales and installation of water supply and sewerage system devices and

equipment

Address: Nakamachi 5-11, Kawaguchi-shi, Saitama-ken 332-8556 Japan

T E L : +81-48-253-0061 FAX: +81-48-253-0056


U R L : http://www.maezawa.co.jp/english/Mmain.html

Reducer

Butterfly valve disc for water work Lo-Tm disc

Butterfly valve disc for water work Lo-Tm disc

14

No. 07 HANNO CO., LTD. - Valve production for water works -

■ Outline

Having established in 1958, the company manufactures valves for water works together with Cosmo Koki Co., Ltd., and provides construction using the methods of branching and simplified valve insertion under pressure without water supply suspension.

Specifically, the branch work under pressure uses original divided Tee tubes and a special boring machine to branch existing piping without water supply suspension. The simplified valve insertion work under pressure uses original divided Tee tubes and plugs (valves) to insert the plugs into existing piping without water supply suspension by means of the special boring machine and an inserting machine.

These two work methods are combined to carry out various water service works without cutting off the water supply. Water services in Japan are rarely stopped by water service works.

■ Applications

In foreign countries, both the products and the work methods are applied to the ODA (Official Development Assistance) and other activities through Cosmo Koki Co., Ltd.

The company has mainly developed the business to assist water services including provision of water supply environment for the ODA so far and most of the products are used on the pipelines newly installed. However, with the development of Southeast Asian countries in recent years, each country uses the products in an original way in some cases in addition to ODA activities.

While Japanese water service engineering is regarded as high level in the world, the work methods under pressure are especially interested overseas and the demand is expected to increase more in the future. Introduction of the work methods under pressure can play a role to improve infrastructure services in a reduction of frequency in water stoppage due to water-supply work in foreign countries where urbanization is expected from now.

■ Contact

C o m p a n y : HANNO CO., LTD.

Business: Manufacturing valves for water works

Address: Akanedai 2-2-2, Hannou-shi, Saitama-ken 357-0069 Japan

T E L : +81-42-974-1234 FAX: +81-42-974-5090


U R L : http://www.hanno-ss.co.jp

15

No. 08 FUJI TECOM INC. - Leak noise level logger and digital sound detector -

■ Outline

1. Just push the button! The leak noise is automatically determined.

The Sound Judge unit automatically judges presence of a leak only by pushing the

listening button on electronic listening stick FSB-8D. The simple operation gives

determination of an existing leak in only three seconds.

2. Indication of the judgment by three levels!

The minimum level value retrieved is evaluated by three thresholds to indicate.

These thresholds can be changed according to the survey environment.

3. Logger type capable of recording!

About 2000 judgment results can be recorded on the Sound Judge unit. Furthermore,

the data can be saved on a personal computer using the dedicated accessory

software.

■ Applications

Decrease in the number of experienced leak investigators is an emerging problem also

in Japan. As a result, the person to make request of leak survey becomes difficult to

determine the cost-effectiveness and transparency of the survey result.

In consideration of such situation, the company has promoted development of

investigation devices that keeps the results as the data and easy investigation devices

that anyone can operate.

The Sound Judge unit FSJ-1 can be operated simply by pushing the button and does

not require experiences. In addition, the device records work result of door-to-door

listening as the data.

■ Contact

C o m p a n y : FUJI TECOM INC.

Business: Production and sales of leak detectors and buried object detectors

Address: Kandasakuma-cho 2-20, Chiyoda-ku, Tokyo-to 101-0025 Japan [Headquarters]

(Nobitome 8-6-16, Niiza-shi, Saitama-ken 352-0011 Japan [Technical Development Center,

Training Center])

T E L : +81-3-3862-3196 FAX: +81-3-3866-1979


U R L : http://www.fujitecom.co.jp

16

No. 09 Kanto Service - Water purification plant operation and manipulation service -

■ Outline

The company is proud of its excellent record in the operation and manipulation service for water purification plants in Saitama Prefecture. - The long-term trustee executes entire contract of 24-hour operation control of water purification

plants that cover more than 200,000 people to supply water in Saitama Prefecture (Tokorozawa city: 340,000 people, Kasukabe city: 230,000 people).

- The entire contract means no full-time attendance of the water work entity staff even part time. - The experiences of disasters have led to a number of accumulated know-how. - Since the water distribution amount, the volume of tasks and the capability to deal with emergency

are strongly correlated, we are confident about our techniques. - Many senior engineers with abundant experience to foster younger engineers. - Almost all qualifications required for operation control of water purification plants in Japan are

covered. - More than thirty years of our business accomplishment have supported water service

infrastructures in Japan. - The business system that matches the generation is adopted.

■ Applications - Analyzing the problems on operation control of water purification plants and proposing the

solutions - Planning the capability to deal with emergency in consideration of the properties of the water

purification plant - Proposing more efficient operation - Creating and proposing manuals that reflect the actual water purification plant - Proposing the optimum utilization of human resources - Education and training to work in a water purification plant

■ Contact

C o m p a n y : Kanto Service Business: Contracted business of followings: operation and manipulation of water purification plants;

water meter reading; water bill collection; storage tank cleaning; inspection and maintenance of sewage and rainwater pumps; cleaning, inspection and maintenance of basins and fountain equipment; operation and maintenance of purification tanks; rural community sewerage management; and pump replacement works

Address: 2nd Ozawa Building 4F, Daimon-cho 3-59-2, Saitamashiomiya-ku, Saitama-ken 330-0846 Japan

T E L : +81-48-640-1372 F A X :+81-48-640-1373 E-Mail: [email protected] U R L : http://www.kanto-service.net

17

No. 10 NAOJI Chemical - Flocculant for water purification PSI (polysilica iron) and recycle model of generated soil -

■ Outline

- Major flocculants used in water purification plants are aluminum-based and have

various problems such as anxiety for raw materials and environmental impacts. One

of the possible alternatives is PSI, an iron-based flocculant. The chief components of

PSI are iron and silica and have small effect on environment. Silica is also used for

agricultural materials and the generated soil (flocculation sludge) can be returned to

farmland.

- Regarding actual record of returning to farmland, Ogose town in Saitama Prefecture

used the generated PSI soil that was discharged from the local purification plant for

rice farming (culture soil and paths). The haulm and root grew thick and the unit yield

of brown rice increased.

- For details about the activities of the polysilica iron (PSI) generated soil recycling

model, see the website of the PSI Association:

http://www.psi-npo.jp/document/

■ Applications

- If regions that are richly cultivated with rice, such as Thailand and Vietnam, employ

the PSI generated soil recycling model, some effects including reduction of industrial

waste, increase in rice yield and cost reduction in agricultural materials are

expected.

- In 2010, the Malaysian government officials and water work entities visited Japan for

PSI control training to aim at a reduction in environmental impact caused by

aluminum flocculants.

■ Contact

C o m p a n y : NAOJI Chemical

Business: Production and sales of chemical industrial agents

Address: Hamasaki 1-2-20, Asaka-shi, Saitama-ken 351-0033 Japan

T E L : +81-48-476-3511 FAX: +81-48-487-2829


U R L : http://www.naoji.co.jp/

Left: Test nursery plant Right: Control nursery plant

Left: Control nursery plant Right: Test nursery plant

(Test nursery plant has more roots)

18

C o m p a n y : Totetsu MFG. Co., Ltd.

Business: Production and sales of construction materials

Address: Osaki 3-6-11, Shinagawa-ku, Tokyo-to 141-0032 Japan [Headquarters]

(Shitamachi 1599, Kamoda, Kawagoe-shi, Saitama-ken 350-0844 Japan [Kawagoe Plant])

T E L : +81-3-3493-5911 FAX: +81-3-3493-1470


U R L : http://www.totetu.com

No. 11 Totetsu MFG. Co., Ltd. - Rainwater storage universal underground storage system -

■ Outline

The rainwater storage system comprises plastic storage materials and sheets and has the following features:

(1) Various shapes of large, medium, and small underground storage tanks can be constructed

in a short time. (2) The construction is easier compared with conventional concrete ones, resulting in a

reduction of expenses. (3) The sediment removal control box installed in the previous stage exerts 95% or higher

sediment removal rate and clean rainwater can be stored. (4) The storage material Aqua Palace used as the structural materials inside the storage tank is

not only excellent in pressure resistance and earthquake proof but also allows people to enter inside for inspections and service works.

■ Applications

(1) Effective use of rainwater as a water resource (2) Ensuring emergency utility water (3) Prevention of urban type flood (4) Construction of city with rainwater use (5) Construction of water source substituted for dams and

reservoirs

■ Contact

Sediment removal control box

Inflow of rainwater

Air vent pipe

Cell structure underground water storage tank

Water storage section

External permeable sheet

Water conveyance section

Internal permeable sheet

Backflow prevention valve

Hand pump

Electric pump

Aqua palace

Backflow prevention valve

19

No. 12 Totetsu MFG. Co., Ltd. - Rainwater intake and initial purification technology -

■ Outline

The most important thing to store and use rainwater is the technology of initial purification that

is performed at the same time of water intake. The initial purification has following effects:

- To prevent stored rainwater from going rotten.

- To facilitate advanced use, such as drinking and washing.

- To inhibit generation of mosquitos and algae in the tank.

- Not to cause clogging on the sprinkler nozzle.

- Not to derive failures on the water delivery pumps, extending the service life.

- To prevent clogging on the permeable sheets during rainwater infiltration

Device to take in rainwater that flows down from the roof

Compatible vertical conductor is up to φ75 mm in diameter. Suitable for small to medium scale use of rainwater. Pieces of leaf mold are removed on the strainer on the device top. Most of air pollutant that is dissolved and included and dust are removed inside the device by flow separation.

Device to take in rainwater that flows down from the roof same as I Type.

Compatible with almost all vertical conductors of small to large diameter. Suitable for medium to large scale use of rainwater. Fallen leaves, insects, and small stones are caught by the strainer and most of air pollutant and dust contained in the initial rainwater are led to the initial rainwater pool. Having a water delivery function by natural water pressure, the aboveground installation tank can be put in an arbitrary place.

Totetsu initial water purification device

Flow separation dust remover Bunryu I Type

Flow separation dust remover Bunryu II Type

Leaves and other objects accumulated on the strainer

Sediment is discharged to the outside.

Strainer

Device body

Device body Strainer taken out from the opening

The float elevates as rain falls to block the opening.

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Device to take in surface stream water

The initial purification device takes in and purifies the rainwater that has flown down on the ground surface and got collected in U-shaped gutter and leads it to the underground water storage tank. The pollutant in rainwater is removed in the order of large size to small as the rainwater flows to the screen, the sand settling section and then the earth and sand sedimentation section (the initial rainwater pool).

Device body Water delivery by natural water pressure

Water delivery capacity of Bunryu II Type The development of the Bunryu II Type, which relies on natural water pressure to conduct

rainwater to distant water-storage tanks, makes possible extensive use of large aboveground

tanks. To build this water-delivery system, the A and B sections must be hermetically sealed to

prevent leakage, and all dirt and contaminants must be completely removed inside the device.


Inflow pipe

Lower control box

(Top view)

Inflow

Flow of initial rainwater

Earth and sand sedimentation

section

The inlet to the earth and sand sedimentation section is provided widely.

Discharge (initial rainwater overflow)

PVC pipe About 15 degrees of inclination on the bottom disk

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C o m p a n y : Totetsu MFG. Co., Ltd.

Business: Production and sales of construction materials

Address: Osaki 3-6-11, Shinagawa-ku, Tokyo-to 141-0032 Japan [Headquarters]

(Shitamachi 1599, Kamoda, Kawagoe-shi, Saitama-ken 350-0844 Japan [Kawagoe Plant])

T E L : +81-3-3493-5911 FAX: +81-3-3493-1470


U R L : http://www.totetu.com

■ Application

■ Contact

Initial rainwater is split and most of pollutant and dust in the rainwater are removed.

Pollutant and dust in rainwater are removed when surface stream water is taken from U-shaped gutter and clean rainwater is delivered to the underground tank.

With the fundamental functions same as Bunryu I Type, it delivers water to the rainwater tank distant from the building by natural water pressure (water head difference).

Bunryu I Type Bunryu II Type


General Affairs Division Saitama Prefecture

Bureau of Public Enterprise

Takasago 3-14-21, Urawa-ku, Saitama-shi, Saitama-ken 330-0063 Japan

T E L: +81-48-830-7016 F A X: +81-48-822-9609 E-mail: [email protected]

Oct 2014

Arakawa River water pipe bridge

(Longest water pipe bridge in Japan, Length: 1,101 m)

Oct 2014

bureau of public enterprise - saitama prefecture of saitama prefecture and the saitama prefecture...

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