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用低温酸析法处理G盐生产过程中产生的废母液,研究温度和pH条件对处理效果的影响.首先分别以R盐和G盐配制的模拟废水为研究对象,发现R盐酸析效果明显,其酸析效果随温度的降低而升高,随pH的升高而降低;而G盐没有出现酸析现象.然后,以实际G盐废母液为研究对象,在-12℃条件下冷冻12h,其COD去除率为55％,其酸析出的固体主要成分为R盐;计算可得每升实际G盐废母液可以回收纯度为51％的R盐111.3 g.以每天处理10 m3废水工程为例,该低温酸析工艺所需的电功率为8.41 kW,废水处理工程的静态投资回收期为0.48年.结果表明,通过低温酸析法对实际G盐废母液中R盐进行资源化回收是有效、可行的.“,”The mother liquor from the G salt production process was treated by a low-temperature acidulation precipitation technology,while the influences of temperature and pH on the processes were studied.The simulated wastewater was prepared with R salt and G salt,respectively.The results showed that the acidulation precipitation of R salt increased with decreasing temperature,but decreased with increasing pH.However,the acidulation precipitation of G salt was negligible.When the actual G salt mother liquor was frozen for 12 hours at -12 ℃,the removal rate of COD was 55％,and the main composition of the crystalline solid was R salt.According to the calculation,treating the real G salt mother liquor could recover 11 1.3 g per liter solid,of which the purity of R salt was 51％.In a case study,treating wastewater of 10 m3 · d-1,the energy consumption was 8.41 kW,and the static payback time of wastewater treatment engineering was 0.48.As a result,it was found that low-temperature acidulation precipitation was effective and feasible for recovering R salt from the real G salt mother liquor.