Ogden Water have supplied water treatment services and equipment to one of the UK's leading healthcare product manufacturers for several years.
The site have recently invested in several major plant upgrades, including a new DAF unit, storage tanks and a sludge press.
The full system includes:
- Primary filtration using a rotary drum screen (RDS)
- Balancing tank to maintain a consistent incoming effluent quality
- Automated chemical dosing and mixing
- Chemical storage tanks
- Dissolved Air Floatation (DAF)
- Chemical supply
- Sludge tank
- Sludge press
The system is set up with duty/standby equipment where feasible to provide a layer of protection and reassurance and also make maintenance much easier.
At a run rate of 15-20m3/hr, total suspended solids are reduced by more than 95% from a typical concentration of 2000mg/L in the raw effluent to less than 100mg/L in the treated water to discharge. COD levels are down from 9000mg/L in the raw effluent to around 2000mg/L in the treated water.
From these values, the cost reductions based on the MOGDEN formula are:
|Cost per m3||Cost per day||Cost per year|
The newly-installed sludge press saves previous high costs for disposal of sludge. Instead, the water is removed from the sludge with a press, leaving a solid cake which can be removed in the skip shown below.
Previous costs = 4x 28Te tanker disposals per week = £4000 per week = £208,000 per year.
This gives a return on investment for the sludge press of less than 12 months.
The site also benefits from treatment chemical supply and a monthly service visit from Ogden Water, which includes sampling and analysis, equipment inspection and calibration, recommendations for optimisation and advice on how to maximise efficiency with the treatment plant as a whole.