China Petroleum Chemical Corporation

Sinopec Catalyst Co., Ltd.

Zhijian Liu

Tao Wang

Ye Li

Songyuan Gu

Ling Yang

Zhiwei Yuan

Xiping Yin

Hongliang Yi

Jin'ai Gao

Tao An

Fuzu Liu

Yuhua Chen

Zhimin Zhang

Shupeng Xu

Yan Zhou

Hongqi Guo

In a method for treating waste water containing ammonium salts, sodium sulfate crystal is obtained by freezing crystallization, then the pH value of the waste water is adjusted to a specific range, and next sodium chloride crystal and ammonia water is obtained by evaporation. Alternatively, the pH value of the waste water is adjusted to a specific range, then sodium chloride crystal and ammonia water is obtained by evaporation, and next sodium sulfate crystal is obtained by freezing crystallization. This method can recover ammonia, sodium sulfate, and sodium chloride from the waste water.

Apparatus and method for treating waste water containing ammonium salts

Apparatus and methods are related to treating waste water containing ammonium salts, which contains NH, SO, Cl, and Na. In such a method, the pH value of the waste water to be treated is adjusted to a specific range in advance; sodium sulfate crystal and relatively concentrated ammonia are obtained by first evaporation, and then sodium chloride crystal and relatively dilute ammonia is obtained by second evaporation; alternatively, sodium chloride crystal and relatively concentrated ammonia is obtained by third evaporation, and then sodium sulfate crystal and relatively dilute ammonia are obtained by fourth evaporation. Ammonia, sodium sulfate, and sodium chloride from the waste water are recovered so that the resources in the waste water can be reused.

The present invention relates to the waste water treatment field, and discloses apparatus and method for treating waste water containing ammonium salts, which contains NH, SO, Cl, and Na. In the method of the present invention, the pH value of the waste water to be treated is adjusted to a specific range in advance; sodium sulfate crystal and relatively concentrated ammonia are obtained by first evaporation, and then sodium chloride crystal and relatively dilute ammonia is obtained by second evaporation; alternatively, sodium chloride crystal and relatively concentrated ammonia is obtained by third evaporation, and then sodium sulfate crystal and relatively dilute ammonia are obtained by fourth evaporation. The method of the present invention can recover ammonia, sodium sulfate, and sodium chloride from the waste water respectively, so that the resources in the waste water can be reused as far as possible.

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Beijing, China

Zhijian Liu