[Methodological aspects of hygienic evaluation of small-sized plants safety for biological purification of household waste waters].

The paper deals with the studies of the efficiency of four small-sized plants for biological purification of household waste waters (WW), which were conducted by using a complex of sanitary criteria, such as organoleptic, sanitary-and-chemical and sanitary-and-microbiological parameters of water quality of water objects, such as purified WW reservoirs, and presents a comparative assessment of their efficiency. The used methodological scheme is shown to provide an objective evaluation of the sanitary efficiency of the equipment under test with an compulsory set of regulated and additional integral parameters that should be regarded in combination. It is recommended that preference should be given to WW purification technologies that are effective in removing the environmentally hazardous chemical substances used in household chemistry.