| Development of an evaporation crystallizer for desalination of alkaline organic wastewater before incineration |
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| 作者姓名： | 马静颖 马增益 严建华 倪明江 岑可法 |
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| 作者单位： | [1]Clear Energy and Environment Engineering Key Laboratory of MOE, Institute of Thermal Power Engineering Zhejiang University, Hangzhou 310027, China [2]City Construction Department, Zhej iang College of Construction, Hangzhou 311231, China |
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| 摘 要： | A wastewater evaporation-desalination pretreatment method was introduced to remove the Na^＋ and K^＋ salts in volatile organic compounds （VOCs） wastewater before it was fed into the incinerator. VOCs in the wastewater were volatilized in the evaporation system and then the vapor was combusted in an incinerator. Simulated phenol wastewater containing sodium chloride was evaporated and concentrated and sodium chloride was crystallized in different parameters. The experimental results showed that the higher initial concentration of sodium chloride increases the ratio of volatilization of VOCs, which was due to the effect of “salting out” （a decrease in the solubility of the nonelectrolyte in the solution, or more rigorously, an increase in its activity coefficient, caused by the salt addition （Furter and Cook, 1967））. When evaporation speed was increased from 1.67 ml/min to 2.73 ml/min, the total removal coefficient of sodium chloride was about 99.88%-99.99%. This pretreatment procedure eliminates the slag phenomenon caused by Na^＋ and K^＋ salts during wastewater incineration, so the incinerator could operate continuously, and the wastewater evaporation could increase the heat value of wastewater, and the operation cost would be reduced.
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| 关 键 词： | 盐分废水 有机化合物 氯化钠 蒸发作用 脱盐处理 |
| 收稿时间： | 2005-04-18 |
| 修稿时间： | 2005-07-08 |
Development of an evaporation crystallizer for desalination of alkaline organic wastewater before incineration |
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| Ma Jing-ying,Ma Zeng-yi,Yan Jian-hua,Ni Ming-jiang,Cen Ke-fa.Development of an evaporation crystallizer for desalination of alkaline organic wastewater before incineration[J].Journal of Zhejiang University Science,2005,6(10):1100-1106. |
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| Authors: | Ma Jing-ying Ma Zeng-yi Yan Jian-hua Ni Ming-jiang Cen Ke-fa |
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| Institution: | (1) Clear Energy and Environment Engineering Key Laboratory of MOE, Institute of Thermal Power Engineering, Zhejiang University, 310027 Hangzhou, China;(2) City Construction Department, Zhejiang College of Construction, 311231 Hangzhou, China |
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| Abstract: | A wastewater evaporation-desalination pretreatment method was introduced to remove the Na and K salts in volatile organic compounds (VOCs) wastewater before it was fed into the incinerator. VOCs in the wastewater were volatilized in the evaporation system and then the vapor was combusted in an incinerator. Simulated phenol wastewater containing sodium chloride was evaporated and concentrated and sodium chloride was crystallized in different parameters. The experimental results showed that the higher initial concentration of sodium chloride increases the ratio of volatilization of VOCs, which was due to the effect of "salting out" (a decrease in the solubility of the nonelectrolyte in the solution, or more rigorously, an increase in its activity coefficient, caused by the salt addition (Furter and Cook, 1967)). When evaporation speed was increased from 1.67 ml/min to 2.73ml/min, the total removal coefficient of sodium chloride was about 99.88％～99.99％. This pretreatment procedure eliminates the slag phenomenon caused by Na and K salts during wastewater incineration, so the incinerator could operate continuously, and the wastewater evaporation could increase the heat value of wastewater, and the operation cost would be reduced. |
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| Keywords: | Salty wastewater Volatile organic compounds (VOCs) Sodium chloride Evaporation Crystallization Desalination |
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