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Abridged Project Methodology

15th October 2013

Graham Mann H2O Building Services

Current Situation

An assessment or audit of the waste water being generated is the most important starting point for any project.

This is split into two categories:

1. Discharge consents to ensure compliance is being achieved – typically flow, pH, oils and grease, solids, COD, phosphate, ammonia, heavy metals etc

2. Data regarding chargeable components – flow, solids and COD only for the MOGDEN formula

Typical charts can be seen on the next pages

0 20 40 60 80 1000

2,000

4,000

6,000

8,000

10,000

12,000

14,000 Graph to show weekly flow rate / m3Flow (m3) BROOK ST. PRFlow (m3) BROOK ST. PAFlow (m3) NO.1 BREWERY

0 20 40 60 80 1000

1000

2000

3000

4000

5000

6000

7000

8000Graph to show weekly average COD / mg/l

Cumulative Average COD (mg/l) BROOK ST. PROCESS

Cumulative Average COD (mg/l) BROOK ST. PACKAGING

Cumulative Average COD (mg/l) NO.1 BREWERY

0 20 40 60 80 1000

200

400

600

800

1000

1200

1400

1600Graph to show weekly Suspended Solids / mg/l

Cumulative Average SS (mg/l) BROOK ST. PROCESSCumulative Average SS (mg/l) BROOK ST. PACKAGINGCumulative Average SS (mg/l) NO.1 BREWERY

Effluent Treatment

1. Physical

Filtration:

Traditional wedge wire screensminimum solid capture = 1 mm

Revolutionary Ogden Water FilSysminimum solid capture = 50 microns

Settlement:

Heavier material sinks to the bottom

Flotation:

Less dense material floats to the surface

Effluent Treatment

Ogden Water Ltd.

2. Chemical

An enhancement of physical separation.

Chemicals can be used to:

Increase the chances of capture by binding particles together

Increase the density of the particles through chemical binding

Use of chemical treatment to encourage binding of solids toair (micro bubbles) for enhanced flotation

(Dissolved Air Flotation)

Effluent Treatment

3. Biological

Simple forms of bacteria are used to eat the organic material present in the wastewater.

Through their metabolism, the organic material is transformed into cellular mass, which is no longer in solution but can be precipitated at the bottom of a settling tank.

The water exiting the system is therefore much cleaner.

Effluent Treatment

Reasons to treat:

Compliance

Cost saving

Water re-use

 

Example Effluent Treatment Projects

Physical – Filtration System plant:

1,200 m3/day of effluentCOD 1,500 mg/l Solids 2,000 mg/l. 

Budget £120,000. 

Chemical – Dissolved Air Flotation plant:

480 m3/day of effluentCOD 4,500 mg/l Solids 1,000 mg/l. 

Budget £80,000. 

 

Effluent Treatment

Biological – MBR plant with RO for water recovery:

400 m3/day of effluentCOD 2,500 mg/l Ammonia 200 mg/l. 

Budget £1m. 

Recovered water = 300m3/day

 If greater than 40% is recycled, there is access to grant funding and the possibility of enhanced Capital Allowance to be claimed.

 

Project Methodology and Work Schedule

24 hourly sampling and analysis programme

Laboratory test work – solids removal and effect on COD, pH correction

Budget quotation – funding available, timescales involved etc.

Full draft quotation

Visit to reference sites

Presentation, discussion meetings to finalise the quote

Design, build, install

Service, support and continuous improvement

 

To find out how we can help you reduce your water and sewage costs, please get in touch with H2O Building Services - http://www.h2obuildingservices.co.uk/

Call us at: 0845 658 0948