Municipal Wastewater Treatment - with high Fats, Oils and Grease

Case Study #1

Flow 2,000,000 / day average dry weather flow, high peak loadings - Water retention time 8 hours.

Sludge retention time of 5-7 days.

Problem: Poor biological treatment throughout the plant due to sludge carry over. High levels of grease and fats.

Treatment: The recommended daily dose was applied directly into every channel of the plant. See table below.

Results: The following averages were achieved after 6 months of treatment. The amount of oxygen required to run the plant was reduced by 30%. There was a significant reduction in grease and fats.

	BOD	BOD	COD	COD
	Influent	Effluent	Influent	Effluent
Before Treatment	460	95	580	135
Month 1	460	85	600	95
Month 2	440	38	560	80
Month 3	480	30	620	60
Month 4	560	28	680	62
6 month average	460	28	520	55
With treatment
	mg/L	mg/L	mg/L	mg/L

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