abridged project methodology 15 th october 2013 graham mann
TRANSCRIPT
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
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.
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