Abstract
The strong alkaline fluids of the night soils separated from the chemical treatment were nutralized by aeration.With the aeration of 30l/1l sample/hr. for 24hr., pH was reduced from 12.0 to 8.4 and total nitrogen was reduced from 2369ppm to 879ppm. With the aeration of 50l/1l sample/hr. for 16hr., pH was reduced from 11.8 to 8.2 and total nitrogen was reduced from 1740ppm to 833ppm. With the aeration of 450l/1l sample/hr. for 2hr., pH was reduced from 11.0 to 8.0 and total nitrogen was reduced from 2135ppm to 600ppm.The above separated fluids was digested anaerobically at 30°C with sludge obtained from a digestion tank. In the separated fluids after 15 days of digestion, BOD was reduced to approximately 200ppm (reduction rate: ca. 90%), COD was reduced to approximately 250ppm (reduction rate: ca. 20%), Volatile acid alkalinity was reduced to approximately 250ppm (reduction rate: ca. 80%).
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