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

（1）中和絮凝-壓濾沉淀段。原水儲(chǔ)罐混合廢水經(jīng)離心泵送入中和絮凝沉淀池，在攪拌條件下加入定量固體氧化鎂粉和中性絮凝劑。調(diào)節(jié)pH值8.0，離心泵將懸浮液輸送程控自動(dòng)密封壓濾機(jī)。

(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）蒸發(fā)階段過程。中和池濾液送入效應(yīng)蒸發(fā)器，濾液蒸發(fā)濃縮后進(jìn)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）膜處理部分。蒸發(fā)后，兩級(jí)蒸發(fā)液經(jīng)過微濾和納濾處理。淡水透光率達(dá)85%，COD在500毫克/升以下。濃水進(jìn)入一級(jí)，淡水由三層反滲透膜分離。膜分離裝置設(shè)計(jì)處理能力為5.0m3/h，淡水4.25m3/h，水約占總量的85%。處理后COD不超過60毫克/升，BOD不超過30毫克/升。為保證污水處理系統(tǒng)平穩(wěn)運(yùn)行，調(diào)整廢水預(yù)處理投加量，降低投加負(fù)荷，調(diào)整中和劑、絮凝劑的加入時(shí)間和攪拌時(shí)間。在團(tuán)簇效應(yīng)的作用下，廢水絮凝劑顆粒大量增加，有效降低了處理后的COD指標(biāo)。

(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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