[Problems of ecology. Technology of submerged biological treatment of sewage]

A technological process is described for the submerged biological treatment of household and industrial sewage and in particular pharmaceutical industry and pooled sewage. The submerged biological treatment of the sewage to the maximum permissible concentrations adopted for the water in fish farming is achieved by the use of submerged and immobilized microorganisms in a multistage process under anaerobic and aerobic conditions and the use of chemically active and inert materials as carriers of the microorganisms inducing certain biological processes. The data on the ecological estimation of the treated sewage by the stages of the technological process are presented.