The objective of this study was to clarify quantitatively the role of household wastewater as one of the causes of the rapid pollution of nearby water-bodies and to consider the importance of countermeasures at the stage of pollutant load generation. Using mass balance techniques, actual samples and measurements, or by referring to the literature, reliable values of the pollutant load factor of household wastewater were obtained for both the residential and occupational population and after every type of treatment system. Then, to verify the reliability of these values, the flow-out rate of the pollutant load from small river basins was investigated in fine weather. The results show that the proposed values of the pollutant load factor were appropriate, and cesspool night soil and miscellaneous household wastewater are the main causes of the pollution of nearby waterbodies. The results of several experiments show that awareness regarding pollutant load at the stage of its generation, e.g. in cooking and dining, can greatly reduce the pollutant load.

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