顺酐废水处理工艺一般是：顺酐工艺废水-集水井-隔油调节池-EBR反应器(铁碳微电解)-破乳反应池-气浮系统-缓冲水池-混凝沉淀池-配水池-IC反应器-一阶氧化-中间沉淀池-二阶氧化池-二级沉淀池-臭氧氧化池-生物滤池-清水池，由于其中含有较多的难降解有机物，经过现有技术进行生物降解后仍很难达到排放标准，并且造成废水处理费用高。

The general treatment process for maleic anhydride wastewater is as follows: maleic anhydride process wastewater - collection well - oil separation regulation tank - EBR reactor (iron carbon micro electrolysis) - demulsification reaction tank - air flotation system - buffer tank - coagulation sedimentation tank - water distribution tank - IC reactor - first stage oxidation - intermediate sedimentation tank - second stage oxidation tank - second stage sedimentation tank - ozone oxidation tank - biofilter - clean water tank. Due to the high content of difficult to degrade organic matter in it, After biodegradation with existing technology, it is still difficult to meet the discharge standards and results in high wastewater treatment costs.

现有技术中处理顺酐废水时，把顺酐废水中的马来酸异构为富马酸，然后降温结晶得到富马酸，同时降低废水中有机物含量，但是此方法仅适用于水吸收法顺酐工艺，而不适用普遍使用的有机溶剂吸收法。

In the existing technology, when treating maleic anhydride wastewater, the maleic acid in the wastewater is isomerized into fumaric acid, which is then cooled and crystallized to obtain fumaric acid while reducing the organic matter content in the wastewater. However, this method is only applicable to the water absorption method of maleic anhydride process, and not to the commonly used organic solvent absorption method.

另外，有人提出一种顺酐废水处理的新工艺，即使用碱性萃取剂回收其中的马来酸和富马酸，降低废水中的有机物，然后再去生化处理废水，但是废水中六氢化邻苯二甲酸二异丁酯(DIBE)或者邻苯二甲酸二丁醋(DBP)的可生化降解性比富马酸、马来酸等要低很多，其主要是针对废水中的有机酸性物质的回收处理，但该方法对于废水中的难降解有机物如DIBE或者DBP没有考虑，废水难降解有机物含量依然较高，亦难以进行生化处理，主要依靠其他水稀释处理达标排放。可见，顺酐废水处理工艺需要进行改进。

In addition, some people have proposed a new process for treating maleic anhydride wastewater, which uses alkaline extractants to recover maleic acid and fumaric acid, reduce organic matter in the wastewater, and then treat the wastewater through biochemical treatment. However, the biodegradability of Diisobutyl Hexahydrophthalate (DIBE) or Dibutyl Phthalate Acetate (DBP) in the wastewater is much lower than that of fumaric acid, maleic acid, etc, It mainly focuses on the recovery and treatment of organic acidic substances in wastewater, but this method does not consider the difficult to degrade organic compounds such as DIBE or DBP in wastewater. The content of difficult to degrade organic compounds in wastewater is still high, and it is also difficult to carry out biochemical treatment. It mainly relies on other water dilution treatments to meet the discharge standards. It can be seen that the treatment process of maleic anhydride wastewater needs to be improved.

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