Abstract: A decontamination method of solid-state material contaminated by radiocesium comprising bringing the solid-state material containing radiocesium in contact with a first processing solution and preferably eluting cesium ion from the solid-state material to the liquid phase under the presence of potassium ion or ammonium ion.

Abstract: A decontamination method of solid-state material contaminated by radiocesium comprising bringing the solid-state material containing radiocesium in contact with a first processing solution and preferably eluting cesium ion from the solid-state material to the liquid phase under the presence of potassium ion or ammonium ion.

Abstract: A method and a device for obtaining electric energy efficiently from a hydrous organic substance by suppressing the activation overvoltage of an anode low and thereby obtaining a sufficiently low anode potential. The power generating device comprises an anaerobic region (4) including microorganisms which can grow under anaerobic conditions, solution or suspension containing an organic substance, an electron mediator and an anode (1), an aerobic region (5) including molecular oxygen and a cathode (3), and a diaphragm (2) defining the anaerobic region (4) and the aerobic region (5), wherein a closed circuit (6) is formed by connecting the anode (1) and the cathode (3) electrically with a power utilization apparatus, and oxidation reaction of microorganisms using the organic substance in the anaerobic region (4) as electron donor and a reduction reaction using oxygen in the aerobic region (5) as electron acceptor are utilized.

Abstract: Disclosed are a biological power generator comprising an anaerobic region containing microorganisms capable of growth under anaerobic conditions and an anode having an electron mediator immobilized thereon and having a standard electrode potential (E0?) in a range of ?0.13 V to ?0.28 V at pH 7, an aerobic region containing molecular oxygen and a cathode, and a diaphragm that defines the anaerobic region and the aerobic region, as well as a method of treating organic waste by making use of the biological power generator.

Abstract: A clarification method and apparatus, which can reliably remove heavy metals, including their sparingly soluble fractions, from a contaminated solid material containing the heavy metals, such as soil, sludge, sediments, wastes, or incineration ash, are provided. A reaction vessel 2 is divided into an anode zone 10 containing an anode A, and a cathode zone 20 containing a cathode C, by a diaphragm M provided between the anode A and the cathode C. The cathode zone 20 is supplied with a contaminated solid material containing heavy metals via a contaminated solid material supply means 22, an acidic substance or an alkaline substance via an acidic substance or alkaline substance supply means 24, and in some cases, water via a water supply means 26.

Abstract: Power generation is performed by immobilizing an electron mediator having a standard electrode potential (E0?) at pH 7 in the range of ?0.13 V to ?0.28 V to one of a pair of electrodes to form an anode 1 and electrically connecting the other electrode as a cathode 3 to the anode 1 to form a closed circuit, bringing the anode 1 into contact with microorganisms capable of growing under anaerobic conditions and a solution or suspension 4 containing an organic substance to advance the oxidation reaction by microorganisms using the organic substance as an electron donor, separating the cathode 3 and the solution or suspension through an electrolyte membrane 2 to advance the reduction reaction using oxygen as an electron acceptor at the cathode, and accelerating the oxidation reaction in the biological system.

Abstract: A method for purifying matter contaminated with a halogenated organic compound is disclosed. The method includes the step of adding a reducing agent and a nutritional source for a heterotrophic anaerobic microorganism to the contaminated matter. The reducing agent is reduced iron, cast iron, iron-silicon alloy and so on, or a water soluble compound. A combination of chemical reactions with microorganisms allows to decompose the halogenated organic compound. The nutritional source including an organic carbon and 20 to 50 percent by weight of an oxidized form of nitrogen is added, thereby preventing by products of the decomposition such as generation of noxious gases and decoloration of soil. A method includes the steps of mixing a reducing agent and a nutritional liquid with the contaminated matter, wherein the mixing step including a step of adjusting the contaminated matter at pH ranging from 4.5 to 9.

Abstract: A nutrient solution is reduced with a reducing agent, and introduced into a contaminated object. Alternatively, groundwater reduced with a reducing agent is introduced into the contaminated object. Groundwater is contacted with the reducing agent while being circulated between an aquifer and a housing. A nutrient source for heterotrophic anaerobic microorganism may also be introduced into the contaminated object. The contaminated object contaminated with halogenated organic compounds can be purified efficiently and easily.

Abstract: A method for purifying matter contaminated with a halogenated organic compound is disclosed. The method includes the step of adding a reducing agent and a nutritional source for a heterotrophic anaerobic microorganism to the contaminated matter. The reducing agent is reduced iron, cast iron, iron-silicon alloy and so on, or a water soluble compound. A combination of chemical reactions with microorganisms allows to decompose the halogenated organic compound. The nutritional source including an organic carbon and 20 to 50 percent by weight of an oxidized form of nitrogen is added, thereby preventing by products of the decomposition such as generation of noxious gases and decoloration of soil. A method includes the steps of mixing a reducing agent and a nutritional liquid with the contaminated matter, wherein the mixing step including a step of adjusting the contaminated matter at pH ranging from 4.5 to 9.

Abstract: A method for purifying matter contaminated with a halogenated organic compound is disclosed. The method includes the step of adding a reducing agent and a nutritional source for a heterotrophic anaerobic microorganism to the contaminated matter. The reducing agent is reduced iron, cast iron, iron-silicon alloy and so on, or a water soluble compound. A combination of chemical reactions with microorganisms allows to decompose the halogenated organic compound. The nutritional source including an organic carbon and 20 to 50 percent by weight of an oxidized form of nitrogen is added, thereby preventing by products of the decomposition such as generation of noxious gases and decoloration of soil. A method includes the steps of mixing a reducing agent and a nutritional liquid with the contaminated matter, wherein the mixing step including a step of adjusting the contaminated matter at pH ranging from 4.5 to 9.

Abstract: A process for treating a water containing chlorinated organic compounds, wherein a microorganism is introduced from a degradation tank to a separation tank and an energy source is supplied to the microorganism separated in the separation tank. A water-treatment apparatus having a structure capable of continuously introducing water to be treated through a degradation tank, a separation tank and a reactivation tank. A loss of the energy source such as methane or propane discharged from the separation tank can be reduced. A water-treatment apparatus having a degradation tank and a separation tank, wherein a microorganism can be cultivated in the separation tank. The reactivation tank can be omitted, whereby the entire size of the apparatus can be reduced.