臭氧对陶瓷膜污染的控制及深度处理污水的效果
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摘要
采用规模为20 m~3/d的臭氧/陶瓷膜—生物活性炭组合工艺对污水进行深度处理,考察了除污效果以及膜污染控制方式。在臭氧投加量为5 mg/L、陶瓷膜运行通量为80 L/(m~2·h)的条件下,臭氧/陶瓷膜单元的处理效果最佳。对比臭氧投加量为5和0 mg/L两种试验工况,臭氧直接作用于陶瓷膜表面能够有效减轻膜污染。在22 h运行期间,臭氧投加量为5 mg/L条件下,跨膜压差比较平稳,而投加量为零时,跨膜压差增加了25 k Pa。3种组合工艺的对比结果表明,臭氧/陶瓷膜—生物活性炭工艺出水水质最好,对COD、COD_(Mn)、TOC、DOC、UV_(254)、色度的去除率分别为53%、63%、44%、38%、71%和100%;其次是臭氧—生物活性炭工艺,相应的去除率分别为39%、41%、30%、30%、56%和84%;最后是陶瓷膜—生物活性炭工艺,去除率分别为35%、41%、27%、21%、51%和85%。臭氧/陶瓷膜—生物活性炭组合工艺存在显著的协同作用,能控制膜污染,提高膜通量,改善处理效果。
A pilot-scale study for ozone/ceramic membrane-biological activated carbon( BAC)combined process was conducted to evaluate the pollutant removal performance and the membrane fouling control for advanced wastewater treatment. The results showed that the treatment efficiency of ozone/ceramic membrane process would be optimal when adding 5 mg/L of ozone and keeping flux at 80 L/( m~2·h).Moreover,ozonation could alleviate membrane fouling effectively. The transmembrane pressure kept stable during 22 hours operation at the ozone dosage of 5 mg/L. However,the transmembrane pressure would increase by 25 k Pa once ozone dosage was zero. In three combined processes,the effluent quality of ozone/ceramic membrane-BAC was the best,and the removal rates of COD,COD_(Mn),TOC,DOC,UV_(254) and chromaticity were 53%,63%,44%,38%,71% and 100% respectively. Followed by ozone-BAC process,the removal rates of the above indicators were 39%,41%,30%,30%,56% and 84%respectively. The removal effect of ceramic membrane-biological activated carbon was the worst,with removal rates of 35%,41%,27%,21%,51% and 85% respectively. There were some synergistic effects in the ozone/ceramic membrane-biological activated carbon,which resulted in alleviation of membrane fouling,higher membrane flux and improved treatment efficiency.
A pilot-scale study for ozone/ceramic membrane-biological activated carbon( BAC)combined process was conducted to evaluate the pollutant removal performance and the membrane fouling control for advanced wastewater treatment. The results showed that the treatment efficiency of ozone/ceramic membrane process would be optimal when adding 5 mg/L of ozone and keeping flux at 80 L/( m~2·h).Moreover,ozonation could alleviate membrane fouling effectively. The transmembrane pressure kept stable during 22 hours operation at the ozone dosage of 5 mg/L. However,the transmembrane pressure would increase by 25 k Pa once ozone dosage was zero. In three combined processes,the effluent quality of ozone/ceramic membrane-BAC was the best,and the removal rates of COD,COD_(Mn),TOC,DOC,UV_(254) and chromaticity were 53%,63%,44%,38%,71% and 100% respectively. Followed by ozone-BAC process,the removal rates of the above indicators were 39%,41%,30%,30%,56% and 84%respectively. The removal effect of ceramic membrane-biological activated carbon was the worst,with removal rates of 35%,41%,27%,21%,51% and 85% respectively. There were some synergistic effects in the ozone/ceramic membrane-biological activated carbon,which resulted in alleviation of membrane fouling,higher membrane flux and improved treatment efficiency.
引文
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[2]范小江,雷颖,韦德权,等.臭氧/陶瓷膜集成工艺的饮用水安全性研究[J].中国给水排水,2014,30(15):44-49.Fan Xiaojiang,Lei Ying,Wei Dequan,et al.Study on drinking water safety of integrated process combining ozonation with ceramic membrane[J].China Water&Wastewater,2014,30(15):44-49(in Chinese).
[3]崔继超,李占川,胡永琪,等.全自动陶瓷膜稠厚器及其在轻质碳酸钙生产中应用[J].无机盐工业,2016,48(5):58-59.Cui Jichao,Li Zhanchuan,Hu Yongqi,et al.Application of automatic ceramic membrane thickener in production of precipitated calcium carbonate[J].Inorganic Chemicals Industry,2016,48(5):58-59(in Chinese).
[4]Zhu B,Hu Y,Kennedy S,et al.Dual function filtration and catalytic breakdown of organic pollutants in wastewater using ozonation with titania and alumina membranes[J].J Membr Sci,2011,378(1):61-72.
[5]Zhang J L,Yu H T,Quan X,et al.Ceramic membrane separation coupled with catalytic ozonation for tertiary treatment of dyestuff wastewater in a pilot-scale study[J].Chem Eng J,2016,301:19-26.
[6]卜庆杰,文湘华,黄霞.新型膜-生物反应器在不同通量下的膜污染特性研究[J].环境污染治理技术与设备,2005,6(3):85-90.Bu Qingjie,Wen Xianghua,Huang Xia.Study on the fouling characteristics of a novel MBR operated under different fluxes[J].Techniques and Equipment for Environmental Pollution Control,2005,6(3):85-90(in Chinese).
[7]颜晓飞,武福平,王颖超,等.电絮凝与浸没式超滤工艺联用去除窖水中氨氮和TP的研究[J].水处理技术,2014,40(4):118-121.Yan Xiaofei,Wu Fuping,Wang Yingchao,et al.Study on the removal of ammonia nitrogen and total phosphorus in pit water by combination of electric flocculation and submerged ultrafiltration process[J].Technology of Water Treatment,2014,40(4):118-121(in Chinese).
[8]张奎山,李继,郭召海,等.饮用水预臭氧化工艺对氨氮的影响[J].中国给水排水,2005,21(8):41-43.Zhang Kuishan,Li Ji,Guo Zhaohai,et al.Influence of preozonation process on ammonia nitrogen in drinking water treatment[J].China Water&Wastewater,2005,21(8):41-43(in Chinese).
[9]杨威,田家宇,李圭白.生物活性滤池饮用水除氨氮的影响因素[J].化工学报,2008,59(9):2316-2321.Yang Wei,Tian Jiayu,Li Guibai.Factors influencing ammonia removal of biological activated filter in drinking water treatment[J].Journal of Chemical Industry and Engineering,2008,59(9):2316-2321(in Chinese).
[10]Sathasivan A,Ohgaki S,Yamamoto K,et al.Role of inorganic phosphorus in controlling regrowth in water distribution system[J].Water Sci Technol,1997,35(8):37-44.
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