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Softening at production plant Rodenhuis

Ontharding op zuiveringsstation

Rodenhuis te Bergambacht

Ruud Kolpa, research departement

Jan van Eekeren, maintenance departement

10-09-2010

Softening at production plant Rodenhuis 2

Subjects:

Oasen and softening policy

Research at Oasen

ZS Rodenhuis


Supply area

14/09/2010 | Oasen watercompany 4

Oasen: Facts and figures

317.000 customers, 750.000 inhabitants

Water consumption

47 Mm3 water per year

per person: 45 m3 per year

36 municipals

7.200 companies

14/09/2010 | Oasen watercompany 5

Oasen: the organisation

250 employees

60 cars

8 production plants

7 distributions stations

1 water towers

1 mainoffice


Typical Riverbank infiltration purification scheme

(intensive) aeration

filtration (wet/dry)

aeration

filtration (wet/dry)

softening

Carry-over filtration

activated carbon

UV-desinfection


Softening policy of Oasen

Less copper and lead

Beter consumer comfort

Less energy consumption

Less use of washing powder

No use of home softening units

0%

10%

20%

30%

40%

50%

60%

70%

80%

90%

100%

% v

an

het

gep

rod

uceerd

e w

ate

r

1995

2000

2005

2008

(ver

wac

ht)

2010

(ver

wac

ht)

2012

(ver

wac

ht)

Voortgang implementatie ontharding

niet onthard

onthard


Subjects:


Research at Oasen

ZS Rodenhuis

Onderzoek: MJOP2010-2012

01-06-2010

Our knowlegde networkWetsus

Bioclear

TU / IHE

RheinEnergie

01-06-2010

PDAM Pontianak

Problem 1: Aeromonas Summer 2006

12

10% > 1000

28% > 500

Problem 2: hydro biology

0

1

2

3

4

2004

2005

2006

2007

Understanding of mechanisms

Basic Approach Oasen

14

Cleaning network

Optimizing

current purification

Adding

Purification

steps

Short - term

Long - term

Network Purification

Redesign

network

Understanding mechanismsSampling sediment

Why sampling sediment?

• Hypothesis: biology in sediment

• Good indication of total amount of biology in distribution system.

Case study

• Sediment sampled in 3 different areas

• Different treatment plant different water quality

• Different biology?

• ATP, Aeromonas, TSS and other parameters

15

Optimizing current purification:

Reduce ATP / biology /AOC by

• Optimizing filter backwash procedures

• ??

But First: develop new on-line measurements!

• Because old methods are:

– Time consuming (Biofilm monitor)

– Expensive (AOC)

– Not quick enough (ATP, CFU) 16

Improving future purification(research)

Prevent regrowth by improving treatment process

• Remove particles/cells/nutrients

– Membrane filtration

– Ion Exchange

– Biological treatment

17

Cooperation with PDAM Pontianak

Main topics:

-Water quality

-Coagulation and filtration

-Leakage control

-Pipeline materials

-Salt intrusion Kapuas river



Subjects:


Research at Oasen

ZS Rodenhuis


Production plant C. Rodenhuis (<2004)

ZS Rodenhuis: Facts and figures

Source: Bank infiltrated ground water from river Rhine

Raw water quality: Fe: 1,9 mg/l Mn: 0,6 mg/l NH4: 1,0 mg/l

Total hardness: 2,4 mmol/l, Bentazone: 0,11 ug/l.

Production (2007): 11,3 Mm3/a (=1290 m3/h)

Proces scheme:

1. Aeration and filtration: removal of Fe, Mn, NH4

2. Softening: Reduction of total hardness

3. Aeration and filtration: removal of carry-over

4. Activated Carbon filtration: removal of pesticides

5. UV-desinfection: safety barrier. Softening at production plant Rodenhuis 21


Richard Lagendijk


spoellucht

ruw

optioneel


pers

zuig

overstort

By-pass

op

tioneel

Ruw water

Filtraat FF


afvalwater


Filtraat FF

Toevoer FK

1e filtraat

spoelwater

Onthard water

ruw

Impressie zs Rodenhuis6 reactoren à 500 m3/h, NaOH

34

Problemen pelletaftapsysteem

35

Onthardingsreactor – de aspecten

-Natronloog

-Entzand (toevoer)

-Pelletaftap

-Korrelbedbeheer


De pelletaftap


Korrelbedbeheer

Aspecten:

-Gewenste korrelgrootte

-Gewenste expansie

-Eén of tweelagensysteem

-Entzandtoevoer: frequentie en hoeveelheid

-Pelletafvoer: frequentie en hoeveelheid


Simulatiemodel Pelletbedbeheer Rodenhuis

OASEN, CGT, 13 jun

entzand: dosering

(50 kg per 10 000 m3)

Calciumconcentratie IN

Calciumconcentratie UIT

(mmol/l)

aftapregime

(1050 kg per 10 000 m3)

Beginsituatie

aantal korrels + diameters

MODEL

0.00

0.50

1.00

1.50

2.00

2.50

3.00

0.0

0.2

0.4

0.6

0.8

1.0

1.2

1.4

1.6

0 20 40 60 80 100 120 140 160 180 200Dagen

D10 (mm) L

D50 (mm) L

D90 (mm) L

Cu (D60/D10) R

0

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200000

0.0

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0 20 40 60 80 100 120 140 160 180 200Dagen

Bedhoogte rust (m) LBedhoogte bij 350 m3/u (m) LSpec. Opp. (vbv/m3 bed in rust) LTotaal bedoppervlak (m2) R

Korrelgrootteverdeling entzand

Dimensionering reactor

Research anaerobic softening RH

- Advantanges:

- Less sludge, less energy, less process steps

- Experiences / literature:

- Fe or PO4 can cause fluffy pellets

- Pilot research was OK

- Research plan:

- With existing installation

- Dosing curve

- Test for several month


0,0

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1,0

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2,0

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0,00 0,05 0,10 0,15 0,20 0,25 0,30 0,35 0,40 0,45 0,50

dosering natronloog in l/m3 influent

ijze

rge

ha

lte

in

mg

/l

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0,15

0,30

0,45

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0,75

0,90

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ma

ng

aa

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eh

alt

e i

n m

g/l

ijzer mangaan

0,0

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dosering natronloog in l/m3 influent

tota

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ard

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id i

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mo

l/l


Thank you for your attention

Questions ?

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