Gongye shui chuli (Mar 2024)

Treatment of pharmaceutical wastewater by combined process of micro- electrolysis-UASB-improved two-stage A/O-sequence batch precipitation

  • ZHANG Jinbiao

DOI
https://doi.org/10.19965/j.cnki.iwt.2023-0221
Journal volume & issue
Vol. 44, no. 3
pp. 190 – 194

Abstract

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The comprehensive wastewater from a pharmaceutical chemical plant in Shandong Province consists of concentrated wastewater,clean wastewater and domestic wastewater. The concentrated wastewater has the characteristics of high COD and high NH3-N,and therefore requires pretreatment after quality separation to meet the water quality standards for the receiving body of the wastewater treatment plant. Firstly,the concentrated wastewater was pretreated with micro-electrolysis. The pretreated concentrated wastewater was mixed with the clean and domestic wastewaters after removing the suspended solids before undergoing subsequent treatment through an UASB-improved two stage A/O-sequence batch precipitation combination process. Engineering practice showed that this process had a good treatment effect on the comprehensive wastewater,resulting in stable operation and a high capacity to handle impact loads. After treatment,the COD,NH3-N and TN of the effluent were reduced to below 200,3 and 20 mg/L,respectively,meeting the secondary standards in Table 4 of the Comprehensive Sewage Discharge Standard (GB 8978-1996) and meeting the water quality requirements of the receiving water body of the sewage treatment plant.

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