TECHNOLOGY FOCUS - ENVIRONMENT - Preferred Method: The calcium sulfate and formic acid which are produced by reacting a strong acid such as sulfuric acid on calcium formate at high temperature high pressure are used as construction raw material, soil conditioner or water purifying agent, and for direct formic acid fuel-cell-electric power generation, respectively. The calcium formate which is produced as intermediate product is used for agricultural material such as flower thinning agent, photo-oxidation damage preventing agent and fertilizer.Similarly, potassium sulfate and formic acid produced by reacting a strong acid such as sulfuric acid on potassium formate at high temperature high pressure are used as fertilizer, and for direct formic acid fuel-cell-electric power generation, respectively. The potassium formate which is produced as intermediate product is used for snow ice preventing agent, feed additive, photo-oxidation damage preventing agent and fertilizer.Sodium sulfate and formic acid produced by reacting a strong acid such as sulfuric acid on sodium formate at high temperature high pressure are used as detergent raw material, glass-making feedstock and bath agent, and for direct formic acid fuel-cell-electric power generation, respectively. The sodium formate which is produced as intermediate product is used for snow ice preventing agent and photo-oxidation damage preventing agent. The hydrogen gas and methane gas in gas of suppressed carbon monoxide concentration generated by partial oxidation of the organic waste material is used for hydrogen fuel battery for electric power generation. The carbonaceous residue generated by partial oxidation of the organic waste material is used for fertilizer and soil conditioner.The carbon material or coke produced in process for generating mixture gas is superheated at 1000degreesC and water vapor is generated. The low molecular organic substance such as formic acid produced from the organic waste material using pressurized hot water method and supercritical water method, is used for direct organic fuel cell electric power generation. The generated residue is used as fertilizer or heat source.The organic waste material containing wooden and herbal organic waste material such as activated sludge, food industry waste material, used paper, organic refuse is subdivided and ground. The produced hydrogen gas (or formic acid) is used for electronic supply source of fuel-cell electric power generation by carrying out hydrogen fermentation (or formic acid fermentation), the low-molecule organic substance containing liquid neutralized by alkali substances such as sulfuric acid saccharified calcined lime or potassium hydroxide or low-molecule organic substance containing liquid obtained by pressurized-hot-water processing.The residue produced by solid-liquid separation before electric power generation is used as a heat source (for combustion), a soil improvement material, a muddy water suppression material, a fine erosion suppression material, a composting raw material or construction material. Excrement organic substance waste material such as activated sludge, wooden and herbal organic substance waste material such as rice straw and mowed grass, food industry waste material, used paper, kitchen garbage and organic substance waste material (combustible wastes) containing plastics, is ground and subjected to acid saccharification.The low-molecular organic substance content liquid obtained by neutralizing low-molecular organic substance content liquid by alkali water such as calcium oxide and potassium hydroxide or pressurization hot water processing after carrying out acid saccharification with the sulfuric acid, ethanol production microbe used for broad application containing a direct organic substance fuel cell, nucleotide fermentation microbes such as organic-acid production microbe such as lactic acid and succinic acid, an amino-acid-fermentation microbe, an inosine, nucleic acid, bioactive substance production microbe such as microbial protein-peptide production microbe, inosine by inoculating and cultivating a bioactive protein-peptide producing microbe or a plant growth promotion microorganism (PGPR, a mycorrhiza fungi, nitrogen fixation microbe), and organic acids, bioactive substances such as ethanol, amino acid, and an antibiotic, bioactive protein and peptide, an industrial enzyme, microbial protein (SCP), a pro-biotic agent, organic substance waste material residue generated according to solid-liquid separation is used as a heat source (for combustion), soil improvement material, cloudy water control material, detailed erosion control material, composting material or construction material, and simultaneously production of pro-biotic agent and raw food fertilizer is carried out.The heavy metal-containing soil, salt accumulation soil, harmful-substance contaminant-containing soil or problem soil, foodstuff waste material containing plant material and harmful substance which are grown by waste-water are used for electric power generation.