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順酐廢水處理工藝一般是：順酐工藝廢水-集水井-隔油調節(jié)池-EBR反應器(鐵碳微電解)-破乳反應池-氣浮系統(tǒng)-緩沖水池-混凝沉淀池-配水池-IC反應器-一階氧化-中間沉淀池-二階氧化池-二級沉淀池-臭氧氧化池-生物濾池-清水池，由于其中含有較多的難降解有機物，經過現(xiàn)有技術進行生物降解后仍很難達到排放標準，并且造成廢水處理費用高。

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.

現(xiàn)有技術中處理順酐廢水時，把順酐廢水中的馬來酸異構為富馬酸，然后降溫結晶得到富馬酸，同時降低廢水中有機物含量，但是此方法僅適用于水吸收法順酐工藝，而不適用普遍使用的有機溶劑吸收法。

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，有人提出一種順酐廢水處理的新工藝，即使用堿性萃取劑回收其中的馬來酸和富馬酸，降低廢水中的有機物，然后再去生化處理廢水，但是廢水中六氫化鄰苯二甲酸二異丁酯(DIBE)或者鄰苯二甲酸二丁醋(DBP)的可生化降解性比富馬酸、馬來酸等要低很多，其主要是針對廢水中的有機酸性物質的回收處理，但該方法對于廢水中的難降解有機物如DIBE或者DBP沒有考慮，廢水難降解有機物含量依然較高，亦難以進行生化處理，主要依靠其他水稀釋處理達標排放。可見，順酐廢水處理工藝需要進行改進。

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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