The coagulant production microbe and that microbial coagulant which possess organicity acid radical quality utilization property and below using this, liquid-waste sludge disposal mannered

摘要

PROBLEM TO BE SOLVED: To obtain a coagulant-producing microorganism capable of producing a microbial coagulant having high coagulation activity at a low cost in a medium containing an organic acid obtained from sewage sludge, etc., as a substrate by separating soil, sludge, etc., with an acetic acid-propionic acid medium as a separation source. SOLUTION: The coagulant-producing microorganism is Citrobacter TKF04 strain (FERM P-16722) proliferative by using an organic acid as a substrate. The microorganism is cultured in a liquid medium prepared by using an organic acid as a substrate and the cultured liquid or the supernatant obtained by removing the microbial cells from the cultured liquid is concentrated and dried by ultrafiltration membrane, etc., or the precipitate is recovered by ethanol precipitation process and the precipitate is desalted (dialyzed) to obtain the objective microbial coagulant. The microbial coagulant produced by the above method is added to the inflow water or treated water of a sewage treatment plant to effect the coagulation and precipitation of sludge and solid material or added to raw sludge or digested sludge to effect the dehydration of the sludge.