PURIFYCATION OF POLLUTED SUBSTANCE BY HALOGENATED ORGANIC COMPOUND

• Main Authors: NIIMURA KOJI, SEKI NAOKI, KATAOKA NAOAKI, SHIMOMURA TATSUO, KITAJIMA NORIMITSU
• Format: Patent
• Language: English
• Published: 21.09.1999
• Edition: 6
• Subjects: CHEMICAL MATERIALS FOR USE IN BREATHING APPARATUS; CHEMICAL MEANS FOR EXTINGUISHING FIRES OR FOR COMBATING ORPROTECTING AGAINST HARMFUL CHEMICAL AGENTS; CHEMISTRY; DISPOSAL OF SOLID WASTE; FIRE-FIGHTING; HUMAN NECESSITIES; LIFE-SAVING; METALLURGY; PERFORMING OPERATIONS; RECLAMATION OF CONTAMINATED SOIL; RECLAMATION OF CONTAMINED SOIL SOIL; TRANSPORTING; TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE

PROBLEM TO BE SOLVED: To prevent the generation of a gas of offensive odor which is generated secondarily in the decomposition of polluted substances and the discoloration of soil to mix a reducing agent and others uniformly in the purification of a large amount of a polluted substance. SOLUTION: In a method for purifying a substance polluted with halogenated organic compounds having a process in which a reducing agent in which standard electrode potential to a standard hydrogen electrode at 25 deg.C is -2400-30 mV and the nutrition source of conventional nutrition type anaerobic microorganisms are added to the polluted substance, the reducing agent is the alloy of reduced iron, cast iron, and an iron-silicon alloy and others or a water soluble compound. The nutrition source contains organic carbon and 20-50 wt.% based on the carbon of oxidized nitrogen. A process in which a nutrient solution and the reducing agent are mixed with the polluted substance, a process in which the pH of the polluted substance is adjusted at 4.5-9.0, and a process in which the mixture is allowed to stand under low ventilation conditions are included.