The PCB wastewater of Dajin Electronic Co. , Ltd is divided into washing wastewater, organic wastewater with high concentration, complexed wastewater, concentrated acid waste liquor etc.

本文介绍的达进电子有限公司PCB废水分为：清洗废水、高浓有机废水、络合废水、浓酸废液等废水。

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Sodium formate from waste alkali liquor was analyzed by perchloric acid nonaqueous titration instead of potassium permanganate method, which caused larger deviation.

采用高氯酸非水滴定法分析废碱液中的甲酸钠，代替了误差较大的高锰酸钾法。

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The method using soluble calcium salt for regeneration of waste electroless nickel plating liquor, in which the lactic acid used as complexing agent and hypophosphite used as redcing agent is studied.

研究了采用可溶性钙盐对以乳酸为络合剂，次磷酸盐为还原剂的失效化学镀镍溶液的再生。

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