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. Abridged Project Methodology 15 th October 2013 Graham Mann.

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1 . Abridged Project Methodology 15 th October 2013 Graham Mann

2 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




6 Effluent Treatment 1. Physical Filtration: Traditional wedge wire screens minimum solid capture = 1 mm Revolutionary Ogden Water FilSys minimum solid capture = 50 microns Settlement: Heavier material sinks to the bottom Flotation: Less dense material floats to the surface

7 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 to air (micro bubbles) for enhanced flotation (Dissolved Air Flotation)

8 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.

9 Effluent Treatment Reasons to treat: Compliance Cost saving Water re-use

10 Example Effluent Treatment Projects Physical – Filtration System plant: 1,200 m3/day of effluent COD 1,500 mg/l Solids 2,000 mg/l. Budget £120,000. Chemical – Dissolved Air Flotation plant: 480 m3/day of effluent COD 4,500 mg/l Solids 1,000 mg/l. Budget £80,000.

11 Effluent Treatment Biological – MBR plant with RO for water recovery: 400 m3/day of effluent COD 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.

12 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

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