随着环境法规继续变得更加严格，行业面临着采用新技术来处理排放到下水道的废水。使用金属加工液的行业可能会发现很难满足其公共处理厂（POTW）规定的化学需氧量（COD）水平。金属加工液的COD本来就很高。这是因为流体由复杂的有机化合物组成，难以破坏。讨论了降低金属加工液COD的方法。详细讨论了各种方法的性能和局限性。所有研究的方法都是在通过超滤进行初步处理之后进行的。彻底检查的技术包括化学氧化、催化剂紫外线、膜技术和生物降解。本文概述了技术、性能和应用

AS ENVIRONMENTAL REGULATIONS CONTINUE TO BECOME MORE STRINGENT, INDUSTRY IS FACED WITH IMPLEMENTING NEW TECHNIQUES TO TREAT WASTE WATER THAT IS DISCHARGED TO THE SEWER. INDUSTRIES USING METALWORKING FLUIDS MAY FIND IT DIFFICULT TO MEET THE CHEMICAL OXYGEN DEMAND (COD) LEVEL MANDATED BY THEIR PUBLICLY OWNED TREATMENT WORKS (POTW). METALWORKING FLUIDS HAVE AN INHERENTLY HIGH COD. THIS RESULTS FROM THE FLUIDS BEING COMPRISED OF COMPLEX ORGANIC COMPOUNDS THAT ARE DIFFICULT TO DESTRUCT. METHODS OF REDUCING THE COD OF METALWORKING FLUIDS ARE DISCUSSED. THE PERFORMANCE AND LIMITATIONS OF VARIOUS METHODS ARE DISCUSSED IN DETAIL. ALL METHODS INVESTIGATED ARE FOLLOWING PRIMARY TREATMENT BY ULTRAFILTRATION. TECHNIQUES THOROUGHLY EXAMINED WERE CHEMICAL OXIDATION, ULTRAVIOLET LIGHT WITH CATALYSTS, MEMBRANE TECHNOLOGIES, AND BIODEGRADATION. THIS PAPER PROVIDES A SUMMARY OF TECHNOLOGY, PERFORMANCE, AN