Egg processor
Ogden Water were approached by an existing customer who had another site elsewhere in the country which required assessment and ultimately, an effluent treatment plant. The site processes and washes eggs on a very large scale, so the wash waters require treatment prior to discharge to sewer.
After consultations and design discussions, the plant was designed, installed and is now full operational, undergoing regular service visits as part of the ongoing service package.
The plant consists of a newly-created sump and pumping station, rotary drum filtration unit, balancing and pH correction, chemical treatment and a DAF unit.
Pumping station
Heavy duty pumps were installed above-ground for ease of maintenance at the new effluent reception sump ready to feed the rest of the treatment plant.
Filtration
The pumps feed an rotary drum screen filter which is deisgned to remove gross debris such as feathers, cable ties, wrappers and sediment. The filter is highly automated and incorporates a wash cycle to reduce the required manual maintenance and intervention.
Balancing and pH correction
Due to the volumes of effluent produced by the factory, a 30m3 balancing tank was required.
The tank includes recirculation pumps to maintain a homogenous effluent quality and radar level control.
One of the recirculation manifolds also serves as pH correction - this contains pH monitoring and automated chemical dosing pumps to maintain a pH value within the consent limits.
Double-bunded chemical storage tanks were also installed for completion.
Chemical treatment and DAF
The pH is remonitored and readjusted if required in a serpentine pipework setup and a coagulant and polymer are both added to split any solids away from the background water of the effluent.
This chemically-treated effluent is then fed into the DAF unit, where the solids are floated using a specialist aeration pump and skimmed from the surface of the unit. The treated water then discharges under gravity, to drain.
This gives site 95% solids reduction across the system, with <50mg/L suspended solids and <1000mg/L sCOD to discharge
Monitoring compliance
As part of the consent to discharge from the local water authority, a 24hr, refrigerated composite sampler is required by law, along with a flow meter, calibrated and correctly installed to MCERTs standards.
These requirements are consistent, no matter where in the country you are located.
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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.
