DEEP TANK TYPE WASTE WATER TREATMENT UTILIZING SULFATE REDUCING BACTERIA

摘要

PURPOSE: To provide a deep tank type waste water treating method which utilizes sulfate reducing bacteria and does not allow hydrogen sulfide to escape to the outside of a treating chamber. CONSTITUTION: A deep reaction vessel 1 is divided to an anaeration zone 3 and aeration zone 4 communicated with each other at the bottom ends by a perpendicular partition wall 2. An anaerobic treatment by the sulfate reducing bacteria is executed by supplying raw water S to the top part of the anaeration zone 3 and bringing the water into contact with the sulfate reducing bacteria while allowing the water to fall in the zone, by which even the org. compds. hardly decomposable by aerobic microorganisms are decomposed. The raw water S after the anaerobic treatment is admitted from the bottom end of the deep reaction chamber 1 into the aeration zone 4 where the metabolite of the anaeration treatment is decomposed down to the inorg. matter by the aeration treatment. The hydrogen sulfide generated at the time of the sulfate reduction in the anaeration zone 3 is dissolved in the raw water S and while the hydrogen sulfide is held in the water system, the raw water is sent to the aeration zone where the hydrogen sulfide is oxidized to sulfuric acid ions. The hydrogen sulfide having smells is thus prevented from being released outside the reaction chamber 1.