An automatically controlled alternate oxic-anoxic process for small municipal wastewater treatment plants

Bolzonella, D, Battistoni, P, de Angelis, A and Boccadoro, R (2003) An automatically controlled alternate oxic-anoxic process for small municipal wastewater treatment plants. Industrial & Engineering Chemistry Research, 42 (3), 509-515. (doi:10.1021/ie020376g).

Abstract

A patented automatic control device was applied to management of an alternate oxic-anoxic process in a small wastewater treatment plant (700 PE). The control system enabled the optimal time-length of the aerobic and anoxic phases to be determined by analyzing the dissolved oxygen and the oxidation-reduction potential data. Moreover, also a time set point was introduced to establish the maximum length for the two phases. Results showed high performances in biological nitrogen removal (0.7-5.2 mg of NO₃-N L^-1 in the effluent) and a reliable control of the treatment process also during wet weather events. In comparison with extended aeration plants of similar size, lower energetic consumption was observed, generally <200 Wh PE^-1 day^-1. The automatic control device was a reliable system that gave a good performance in a small wastewater treatment plant with low investment and managing costs.

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