Specific composition of wastewater from rendering plants requires a sophisticated approach to treatment. COD content up to 10 g/l and nitrogen up to 2.5 g/l leads to many difficulties during treatment with activated sludge process. Performance of such wastewater treatment plants is generally very unstable: severe problems with filamentous and viscous sludge bulking occur due to macronutrient deficiency, nitrification is often inhibited by high ammonia and nitrite content, no sufficient carbon source for denitrification is available, and high temperatures up to 40 °C negatively influence treatment processes. Appropriate control of pH, temperature, biocatalytic nutrient dosage, suitable external carbon source and restriction of inhibitory effects led to the successful operation of four wastewater treatment plants in the region reaching required effluent standards TIN=60 mg/l and COD=200 mg/l.

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