A nitrification/denitrification process was applied to reject water treatment from sludge dewatering at Bottrop central sludge treatment facilities of the Emschergenossenschaft. On-line monitoring of influent and effluent turbidity, closed loop control of DO and pH, and on-line monitoring of nitrogen compounds were combined to a three level control pattern. Though on-line measurement of substrate and product showed substantial response time it could be used to operate nitrification/denitrification within process boundaries.
B. Teichgräber; Control Strategies for a Highly Loaded Biological Ammonia Elimination Process. Water Sci Technol 1 December 1993; 28 (11-12): 531–538. doi: https://doi.org/10.2166/wst.1993.0693
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