YAO Jing hua,LIAN Xia,QI Jun,et al. Discharge Characteristics and Removal Efficiency of Heavy Metals in Pharmaceutical Wastewater [J].China Water & Wastewater,2020,36(13):83-88.
Discharge Characteristics and Removal Efficiency of Heavy Metals in Pharmaceutical Wastewater
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第36卷
Number:
13
Page:
83-88
Column:
Date of publication:
2020-07-01
- Keywords:
- pharmaceutical wastewater; heavy metal; chemical API; biopharmaceutical; removal efficiency
- Abstract:
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Characteristics of heavy metal discharge in pharmaceutical wastewater from five chemical active pharmaceutical ingredient (API) enterprises and five biopharmaceutical enterprises located in five provinces and cities were studied. The concentrations of six heavy metals including total mercury, total arsenic, hexavalent chromium, total chromium, total cadmium and total lead in the workshop effluent and the enterprises effluent were analyzed. It was found that the concentrations of heavy metals in effluent of the ten pharmaceutical enterprises were lower than the national discharge standards. Heavy metal with the highest detection rate of API wastewater was total arsenic, followed by total mercury and total chromium. The detection rate of total arsenic in workshop effluent was as high as 100%. Heavy metal with the highest detection rate of biopharmaceutical wastewater was total mercury, followed by total arsenic and total chromium, and the detection rate of total mercury in workshop effluent was as high as 100%. The combined wastewater treatment process of pretreatment, biochemical treatment and advanced treatment were adopted by most enterprises, and most of them had obvious removal effects on total mercury, total arsenic and total chromium. Coagulation together with biological adsorption and flocculation were the main reasons contributing to the heavy metals removal, in which dissolved heavy metal ions were converted into insoluble compounds or stable chelates in the sludge.
Last Update:
2020-07-01