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- W2337662015 abstract "The PWR plants have replaced a secondary side pH control agent to minimize the sludge production in the moisture drain and heater drain systems and the sludge transport into steam generator. The increase of pH in the secondary system water decreased the sludge deposit in steam generator and prolonged the runtime of ion exchange beds in the condensate polishing plant. The extended lifetime of ion exchange resin led to the reduction in the amount of regenerant used and regeneration waste produced. However the concentration of chemical oxygen demand and nitrogen in the regeneration waste was elevated due to the physico-chemical property of ethanolamine.The PWR nuclear power plants did not meet intermittently the criterion of release allowance for contaminants and the discharge standard of wastewater quality, especially for COD and N. The treatment technology may be classified as physical, chemical and biological ways. Ethanolamine can be stripped into gas as a function of temperature and solution pH, and oxidized into carbon dioxide and nitrogen gases by electro-chemical and biological oxidation. The electrolysis was difficult to meet the regulation standard due to the possible production of nitrate and was expensive to achieve the complete breakdown. Therefore the total decomposition or recovery of ethanolamine by physical, chemical, or biological processes is the best way to meet the discharge standard of COD and N." @default.
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- W2337662015 date "2009-09-03" @default.
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- W2337662015 title "ETA recovery process with ion exchange and evaporation" @default.
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