Effect of PAC and PAFC on the performance and operation of inner loop continuous sand filter treating petrochemical secondary effluent
WANG Ya-ning1,2, WU Chang-yong2, ZHOU Yue-xi2, LIU Heng-ming1, ZHU Chen2,3, CHEN Teng4
1. School of Marine Science and Technology and Environment, Dalian Ocean University, Dalian 116023, China;
2. Research Center of Water Pollution Control Technology, Chinese Research Academy of Environmental Sciences, Beijing 100012, China;
3. School of Environmental and Municipal Engineering, Lanzhou Jiaotong University, Lanzhou 730070, China;
4. School of Environmental Science and Engineering, Chang'an University, Xi'an 710064, China
The inner loop continuous sand filter (ILCSF) is often used as the pretreatment process for the removal of SS and COD during the advanced treatment of biological secondary effluent. ILCSF can guarantee the operation stability of the following connected advanced treatment unit. In this study, poly aluminum chloride (PAC) and poly aluminum ferric chloride (PAFC) were used as the coagulant and the performance and operation of ILCSF were investigated. The results showed that when the dosages of PAC and PAFC ranged from 5to 30mg/L, the removal of SS and COD increased at the beginning and then decreased when the dosage was over 10mg/L. The optimized coagulant dosage was 10mg/L for PAC and PAFC. The removal rates of SS and COD were 49.7% and 12.9% for PAC and 50.6% and 13.8% for PAFC on the optimized dosage. The ILCSF could preferentially remove the macromolecular organic matters with the relative molecular weight higher than 3k. However, the ILCSF has the poor ability to remove the dissolved organic matters (DOM). The dissolved organic carbon (DOC) removal rate was lower than 5% even on the optimized conditions. The dose of PAFC was more suitable for the stable operation of ILCSF than dose of PAC. The viscosity of the mixture dosing PAFC was lower than that of dosing PAC. In this study, the optimized dosage of PAFC was determined with the value of 10to 15mg/L. It could guarantee the high removal rate of SS and the stable operation of the ILCSF.
王雅宁, 吴昌永, 周岳溪, 刘恒明, 朱晨, 陈腾. PAC和PAFC对内循环连续砂滤器处理石化二级出水的影响[J]. 中国环境科学, 2016, 36(12): 3625-3630.
WANG Ya-ning, WU Chang-yong, ZHOU Yue-xi, LIU Heng-ming, ZHU Chen, CHEN Teng. Effect of PAC and PAFC on the performance and operation of inner loop continuous sand filter treating petrochemical secondary effluent. CHINA ENVIRONMENTAL SCIENCECE, 2016, 36(12): 3625-3630.
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Sudoh R,Islam M S,Sazawa K,et al.Removal of dissolved humic acid from water by coagulation method using polyaluminum chloride (PAC) with calcium carbonate as neutralizer and coagulant aid[J].J.Environ.Chem.Engin.,2015,3(2):770-774.
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Wu C,Gao Z,Zhou Y,et al.Treatment of secondary effluent from a petrochemical wastewater treatment plant by ozonation-biological aerated filter[J].J.Chem.Technol.Biotechnol.,2015,90:543-549.
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