The factory processes both chickens and turkeys and produces an annual wastewater discharge volume of approximately 400 megalitres per annum. The effluent was treated with an inorganic coagulant and polymer combination with limited effectiveness for COD reduction. High COD levels in the effluent equate to high Mogden charges and therefore cost savings would be realised through better COD removal in the process.
Biochemica initially performed screening work through jar tests. The incumbent chemistries were tested against other viable alternatives and a survey of the existing plant and operating parameters was also undertaken in order to understand the existing process.
A more effective coagulant chemistry was identified and improvements to the existing dosing setup were made. A suitable polymer was also selected for the process and both chemistries implemented into the process. The process improvements can be seen in Table 1.
Table 1 Incumbent chemistry performance versus Biochemica performance (actual plant data)
|Parameter||Influent||Incumbent Discharge||Biochemica Discharge|
|COD (mg/l)||2,200 – 4,300||1,900||540|
|TSS (mg/l)||2,300 – 2,700||870||120|
Improved the process performance through a better chemical programme as well as some minor process alterations, and yielded considerable potential annual savings (Table 2).
Table 2 Annual savings in Mogden charges using Biochemica Solution
|Setup||Unit charge per m3||Volume discharge p.a.||Annual discharge costs|
|Biochemica Treatment||£0.71||405,473 m3||£287,885.83|
|SAVING PER ANNUM||£235,174.34|
Benefits of Biochemica Solution:
- Delivered significant annual savings
- Increased process efficiencies (e.g. COD and TSS)
- Maximised process efficiency through regular site service visits as part of solution offering
- Offered potential to re-use treated water back into factory process