| The most traditional approach used for removing pollutant in wastewater is activated sludge processes. Since existing processes, however, have limited abilities in removing nutrient salt so are not able to satisfy the criteria of water quality which is being strengthened. Therefore, current approaches propose the treatment systems which are able to be used for removing the nutrient salt. The target plant of this paper is equipped with night soil treatment system using Bacillus sp; This system is fully able to utilize the previous facilities which are used in activated sludge process, and also has high efficiency in removing not only organic materials but also pollutant such as T-N, T-P nutrient salt. In this paper, I studied for finding the optimized operation conditions in night soil treatment using Bacillus sp. suitable for this plant. As a result, DO represented 1∼2㎎/ℓ when MLSS in aerobic digestion tanks of this system is 8000㎎/ℓ∼10000㎎/ℓ and the removal efficiency of T-N, BOD, COD, SS shows very high, greater than 95%, 98%, 92%, 98% respectively. Therefore, it can be known that the maintenance of MLSS and DO in aerobic digestion tanks is very important. Also, a number of Bacillus sp. grown up to FILAMENT are detected in FLOC, and more Bacillus sp. of endospore near to aerobic digestion tanks 4. The number of Bacillus sp. in aerobic digestion tanks is 10^5∼10^6㎖^(-1). |
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