Deodorization of exhaust gas from wastewater and night‐soil treatment plant by activated sludge

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Abstract
A new deodorizing process using an activated sludge tank was developed and its efficiency and practicality were investigated for the odorous gases emitted from a wastewater treatment plant and a night‐soil treatment plant. Equipment for the experiment was installed in each actual treatment plant site and continuously operated for a few months. The efficiency of deodorization was evaluated by measuring concentrations of main odorants contained in air at the gas‐inlet and the outlet of a deodorizing tank. Though large variation of the odorant concentrations was found in the influent gas during each experiment, the performance was relatively stable and high removal rates of the odorants were obtained at all times. In the wastewater treatment plant, aromatic hydrocarbons and dimethyl sulfide, which were main odorants, were removed from the odorous gases at the rate of about 90% or more by activated sludge tank. On the other hand, in the night‐soil plant, hydrogen sulfide and ammonia in the odorous gases were removed at the rate of about 96% and 100%, respectively. This high deodorizing efficiency of night‐soil odor was kept on condition that a loading of hydrogen sulfide into the deodorizing tank was controlled below 7 mg/g‐MLSS/day.

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