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First Milk Cheese Company

Case Study: First Milk Cheese Company, Haverfordwest, Wales.


Industrial creamery effluent treatment plant.

Estimated capitol coast- £6,000,000. Volumetric consent to discharge – 2400mᵌ per day.
Achieved – 99.9% removal of Nitrates/Phosphates/COD/Solids) – Installation and commissioning of new plant including training of permanent staff with long term support. Advanced chemical dosing systems and significant plant automation.

Case Brief

It was decided that with increasing volumes of waste water being produced and increasing costs due to high demand upon the local sewage treatment works that an independent treatment facility would be built to manage and treat the effluent of the factory and ultimately discharge to the water course.

It was determined that with proper balancing of the effluent that cost effective treatment could be provided with minimal chemical dosing, utilising a DAF clarifier as primary treatment followed by substantial biological treatment.

Consent To Discharge Limitations

  • BOD: 10mg/l
  • TSS: 30mg/l
  • NH4-N: 3mg/l
  • Fe: 5mg/l
  • Al: 1mg/l
  • P: 3mg/l

After a thorough design process construction of the mixed stream treatment works began, ultimately a 1800m3 balancing tank, a 100m3/hour DAF clarifier, 1800m3 of biological treatment (Anaerobic/anoxic/ASP lanes), four 50m3/hour MBR’s, a 2000m3 emergency divert tank and a myriad of chemical dosing and sludge thickening installations were built. Significant automation was designed into the plant in order to treat the range of effluent produced by the factory.

This installation was very successful, with treatment proving to be robust- production is set to increase over the coming years with highly reduced treatment costs!

The significant automation designed into the plant worked very well at reducing the demand on daily operations allowing the training of existing staff to further reduce costs. Emergency procedures have already inhibited numerous issues thanks to this automation.

Conclusion

The effluent quality is well within the consent limits at <1mg/l BOD, <1mg/l SS, 0.007mg/l NH4N, 0.4mg/l P, and 0.496 mg/l Al.

This treatment works has proven so robust that we are now in the process of considering innovative ways to improve the process and reclaim energy.