A low cost treatment alternative for cheese wastewater is discussed. The problem was to redesign three ponds which were operating below the consents. Discharge rate is 500 m3/day with a high organic load (2,750 kg COD/day). The new system consisted of: a grease trap, an anaerobic UASB type pond, an aerated pond and an effluent polishing pond with water hyacinth. Local technology was used except for the aeration equipment. The project was done at a low capital investment (US$ 330,000) and operational costs (US$ 0.55/m3) which were competitive with current market prices but within the official environmental consents.

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