Unilever
Unilever is one of the global leaders in the food/condiment, personal care and household product markets with £2 billion in annual sales in the UK alone.
Ogden Water have installed a full, turn-key trade effluent plant for one of their manufacturing sites.
The system includes:
- Extensive double-skinned pipework from the factory to the plant
- Primary filtration using a premium Salsnes screen
- Balancing tank to maintain a consistent incoming effluent quality
- Chemical dosing and mixing
- Chemical storage tanks
- Dissolved Air Floatation (DAF)
- Chemical supply
- Sludge tank
At a run rate of 10m3/hr, total suspended solids are reduced by more than 95% from a typical concentration of 5000mg/L in the raw effluent to less than 100mg/L in the treated water to discharge. COD levels are down from 20,000mg/L in the raw effluent to less than 1000mg/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 | |
| Before treatment | £31.03 | £7448 | £2,718,501 |
| After treatment | £1.98 | £476 | £173,649 |
| Savings | £29.05 | £6972 | £2,544,852 |
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.
