Wastewater treatment method and wastewater treatment system
A technology for wastewater treatment and water treatment, which is applied in gaseous discharge wastewater treatment, water/sewage treatment, neutralized water/sewage treatment, etc. It can solve the problems of expensive iron metal particles, high equipment costs, and high sludge disposal costs. Achieve the effect of reducing operating costs and reducing equipment costs
Pending Publication Date: 2021-11-26
三菱重工动力环保有限公司
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Problems solved by technology
However, the iron metal particles used for reduction are expensive, and the reaction tank itself is large, resulting in high equipment costs.
In addition, the method of reducing iron metal particles produces about 10 times more sludge than biological treatment, so the cost of sludge disposal is also high.
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[0027] Hereinafter, one embodiment of the wastewater treatment method and the wastewater treatment system of the present invention will be described with reference to the drawings.
[0028] The waste water treatment method of this embodiment treats waste water discharged from a facility that vaporizes fuel containing selenium (Se) in a reducing atmosphere. So-called selenium-containing fuels are, for example, coal. The so-called equipment for gasifying selenium-containing fuel in a reducing atmosphere is, for example, coal gasification power generation equipment.
[0029] In coal gasification equipment, coal is dry-distilled in a reducing atmosphere to generate combustible gas. In the exhaust gas from coal gasification power plants, selenium and cyanogen (CN) are contained. By bringing the exhaust gas into contact with water, selenium and cyanogen contained in the exhaust gas are dissolved in water.
[0030] In wastewater from coal gasification power plants, selenium is for...
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The purpose of the present invention is to provide a wastewater treatment method which removes selenium by oxidation and which reduces the total concentration of selenium in treated water while keepings costs lower than in conventional methods, and to provide a wastewater treatment system. In this wastewater treatment method, an iron agent is added to wastewater that contains selenium and cyanogens to form first aggregates; the first aggregates are removed by solid / liquid separation to obtain first treated water; a second iron agent is added to the first treated water and an acid is added to the first treated water to obtain acidic water; an oxidizing agent is added to the acidic water to oxidize the selenium, and thereafter, a coagulant is added to form second aggregates; and the second aggregates are removed by solid / liquid separation to obtain second treated water.
Description
technical field [0001] The invention relates to a wastewater treatment method and a wastewater treatment system for treating wastewater containing selenium and cyanide. Background technique [0002] Wastewater from coal-fired power plants contains a variety of harmful components. Therefore, treatment to remove harmful components from wastewater is performed to meet discharge standards. [0003] In power generation using coal as fuel, there are coal-fired power generation that has been used conventionally, and coal gasification power generation that has been developed to improve the efficiency of coal power generation. In coal-fired power generation, coal is burned in an oxidizing atmosphere, and steam generated by combustion heat is used for power generation. In coal gasification power generation, coal is dry-distilled under low-oxygen conditions to generate pyrolysis reaction to generate combustible gas, which is used to generate electricity. [0004] In coal-fired power...
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IPC IPC(8): C02F1/52C02F1/58C02F1/72
CPCC02F9/00C02F1/5245C02F2101/106C02F1/66C02F1/722C02F1/56C02F1/683C02F2101/18C02F2103/18Y02W10/37C02F2101/16
Inventor 田井贵士安西政秋小川尚树上原良介
Owner 三菱重工动力环保有限公司