As for the maleic anhydride wastewater treatment process, the specific process is as follows:

（1）中和絮凝-压滤沉淀段。原水储罐混合废水经离心泵送入中和絮凝沉淀池，在搅拌条件下加入定量固体氧化镁粉和中性絮凝剂。调节pH值8.0，离心泵将悬浮液输送程控自动密封压滤机。

(1) Neutralization flocculation pressure filtration sedimentation section. The mixed wastewater from raw water storage tank is sent to neutralization flocculation sedimentation tank by centrifugal pump, and quantitative solid magnesium oxide powder and neutral flocculant are added under mixing conditions. Adjust the pH value to 8.0, and the centrifugal pump will deliver the suspension to the program-controlled automatic sealing filter press.

（2）蒸发阶段过程。中和池滤液送入效应蒸发器，滤液蒸发浓缩后进入中和池。

(2) Evaporation stage process. The filtrate from the neutralization tank is sent to the effect evaporator, and then enters the neutralization tank after evaporation and concentration.

（3）膜处理部分。蒸发后，两级蒸发液经过微滤和纳滤处理。淡水透光率达85%，COD在500毫克/升以下。浓水进入一级，淡水由三层反渗透膜分离。膜分离装置设计处理能力为5.0m3/h，淡水4.25m3/h，水约占总量的85%。处理后COD不超过60毫克/升，BOD不超过30毫克/升。为保证污水处理系统平稳运行，调整废水预处理投加量，降低投加负荷，调整中和剂、絮凝剂的加入时间和搅拌时间。在团簇效应的作用下，废水絮凝剂颗粒大量增加，有效降低了处理后的COD指标。

(3) Membrane treatment part. After evaporation, the two-stage evaporation liquid is first treated by microfiltration and nanofiltration. The light transmittance of fresh water reaches 85% and COD is below 500 mg / L. The concentrated water enters the first stage, and the fresh water is separated by three layers of reverse osmosis membrane. The designed treatment capacity of the membrane separation unit is 5.0m3/h, fresh water is 4.25m3/h, and water accounts for about 85% of the total. After treatment, COD shall not exceed 60 mg / L and BOD shall not exceed 30 mg / L. In order to ensure the stable operation of the sewage treatment system, adjust the dosage of wastewater pretreatment, reduce the dosage load, and adjust the addition time and mixing time of neutralizer and flocculant. Under the effect of cluster effect, the flocculant particles of wastewater increase greatly, which effectively reduces the COD index after treatment.

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