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Abstract

Ammonium is removed from wastewater and transferred into a secondary water circuit. There, the ammonia is oxidized to nitrogen gas in an electrolytic cell. Disclosed is a process-control procedure for minimizing the electricity supplied to the cell, and for ensuring destruction of ammonia down to desired levels. The procedure involves taking pH-readings of the secondary water, and using those pH-readings to determine ammonia levels, and to determine the need for electricity usage to be stepped up or down, and to establish relationships between pH and the progress of the ammonium disposal treatment. The procedure can be used with diverse ways of transferring the ammonia from the wastewater to the secondary water, and with continuous or batch treatment. Instruments for measuring ammonia-concentration directly are expensive, whereas pH-sensors are simple, reliable, and responsive.

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