IMMOBILIZED CARRIER SUITABLE FOR SULFUR-OXIDIZING BACTERIA, IMMOBILIZATION OF SULFUR-OXIDIZING BACTERIA IN IMMOBILIZED CARRIER, CULTURING AND PROPAGATING METHOD FOR SULFUR OXIDIZING BACTERIA IN FIXED BED TYPE BIOREACTOR AND BIOLOGICAL TREATMENT OF WASTE WATER CONTAINING REDUCING SULFUR COMPOUND

摘要

PURPOSE:To culture and propagate sulfur oxidizing bacteria within a short time and lower the treatment facility and treatment cost by combining calcium, regarding a fixing carrier of sulfur oxidizing bacteria for a fixed bed type bioreactor for waste water treatment using sulfur oxidizing bacteria. CONSTITUTION:To prepare a fixing carrier suitable for sulfur oxidizing bacteria to be used for a fixed bed type bioreactor 8, a calcium compound is added to a part of raw materials of the fixing carrier. Consequently, sulfuric acid produced by oxidation of a reductive sulfur compound by sulfur oxidizing bacteria and the combined calcium compound react and thus fine particles of gypsum are formed on the surface of the fixing carrier. The sulfur oxidizing bacteria adhere to the gypsum and are fixed and thus the bacteria are suppressed from lowing out to the treating water from the bioreactor 8. As a result, the sulfur oxidizing bacteria of the bioreactor 8 are kept at high concentration and treatment of waste water containing reductive sulfur compounds can be carried out highly efficiently and the quality of the treating water is improved.