原著

公害

水質汚濁

し尿処理

ふん尿処理

混合処理

Urbanization advanced into rural areas has brought about many small scale dairy-farms encircled by residential sections. There arised environmental pollution problems resulted from an inadequate treatment for dung (urine and faeces of ox) and wastewater from cattles adjecent to those small farms. In order to avoid the urgent affairs of environmental pollution, combined treatment of the dung and human nightsoil applying digestion tanks, usually used for only human nightsoil digestion, was considered. In this report, digestion of the nightsoil and dung in combination under aerobic or anaerobic conditions was experimentally carried out, and the fact was observed that the addition of the dung to the nightsoil revealed the high activation on thedigestive progress. There ascertained the reduction of digestion hours, and never experienced the negative actions of dung addition on the digestive progress, throughout this investigation. The results obtained concerning the active components were asfollows: (1) The activation phenomenon of dung on the digestive progress appeared obviously in the beginning stage of mixing both dung and human nightsoil. (2) Both urine and faeces of ox had the active components for the digestive progress. (3) The active components were dialysed with cellophane membrane of 24Å. (4) The active components were inactivated by heating in 100- for 30 minutes. (5) The active components were adsorbed on ion exchange resins of IR-120 or IRA-400.