In Korea, night soil is treated in private night soil purification tanks, collected night soil treatment plants and as farmyard manure. The systems of night soil disposal, and processes, development and performance of night soil treatment plants with their technical operational problems, are reviewed and analysed to assist in implementation and technical improvement of night soil treatment plants. A great number of night soil treatment plants in Korea have aerobic or anaerobic digestion for primary treatment, and an activated sludge process for secondary treatment. Rural night soil treatment plants are small scale with an average capacity of 18.5 m3/day per plant. The number of toilets collected from is decreasing slightly, but sludge production from private night soil purification tanks is increasing. Therefore, development and extension of night soil treatment plants are very important at present. In many cases, strict control and upgrading of the quality of effluent from collected night soil treatment plants are mandatory. Low-energy systems and reduced-manpower programmes for night soil treatment plants are to be studied and developed as much as possible.

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