PROCESS FOR BIOLOGICAL PURIFICATION OF SEWAGE CONTANING HARDLY BIODEGRADABLE DETERGENTS

摘要

The process for biological purification of sewage containing hardly biodegradable non-ionic detergents consists in subjecting the sewage containing nonylphenolethoxylate having an ethoxylation degree n=10 of non-ionic detergents and other contaminants as oil products and heavy metals to which biogene with phosphorus and ammonia salts are added, in a ratio CBO5 : N : P of 100 : 5 : 1 to an aerobic process of biological purification in an installation with a support for microorganisms, preferably of a submerged biofilter type, with a support of volcanic tufa, with recirculation, to which the selected bacterial strain inoculum is added, said bacterial strain being obtained by a natural process in a quantity of 200 gnsu/ cube meter of installation, the hydraulic retention time of the installation being of 20 ...24 h.