内循环回流比和碳源投加量对两段进水A/O工艺去除重油加工污水氮污染物的影响
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摘要
为了提高传统重油加工污水处理厂氮污染物的去除效率,实现碳、氮污染物的协同脱除,本文结合现场生化装置运行参数和前期研究成果,构建了两段进水A/O工艺中试实验装置和运行参数。侧线实验在一个重油加工污水处理厂开展,以水解酸化单元出水为处理对象。控制工艺条件:分段进水比例为7:3、外循环回流比1、溶解氧浓度(缺氧区0.1～0.4 mg/L,好氧区3.5～4.5 mg/L),重点考察第1段A/O内循环回流比R值、第2段A/O反硝化段外加碳源(葡萄糖)量对装置氮污染物去除效果的影响。研究结果表明,适当增加内循环回流比和碳源投加量,可以明显提高两段A/O工艺的总氮去除能力,并且不会降低有机污染物的去除效果。研究确定,最佳内循环回流比R值为0.5,碳源投加量为30 mg/L。在此条件下,总氮去除率可达84.7%,出水总氮质量浓度可以控制在10 mg/L以下,实现了重油加工污水深度脱氮。
In order to improve the removal efficiency of nitrogen pollutants in traditional heavy oil processing waste water treatment plants and achieve synergistic removal of carbon and nitrogen pollutants, based on the operation parameters of the biochemical device on site and the previous research results, a pilot test device and operation parameters in a two-step-feeding anoxic/oxic(A/O) process was constructed in this paper. The side-line experiment was carried out in a heavy oil processing wastewater treatment plant with the effluent of the hydrolysis acidification unit as the treatment target. Control process conditions, the ratio of step-feed influent water is 7:3, the reflux ratio of external circulation is 1, dissolved oxygen concentration(0.1～0.4 mg/L in the anoxic zone, 3.5～4.5 mg/L in the aerobic zone), pay more attention to the effects of the reflux ratio R of internal circulation of the first-stage A/O and the amount of additional carbon source(glucose) in the denitrification stage of the second-stage A/O on the removal efficiency of nitrogen pollutants. The results show that a proper increase of the reflux ratio in internal circulation and the carbon source addition can significantly improve the total nitrogen removal capacity of the twostep-feeding A/O process and will not reduce the removal efficiency of organic pollutants. The optimum reflux ratio R value of internal recycling is 0.5, and carbon source addition is 30 mg/L, under which the removal rate of total nitrogen can reach 84.7%, and the total nitrogen mass concentration of effluent can be controlled below 10 mg/L, thus realizing the deep denitrification of heavy oil processing wastewater.
In order to improve the removal efficiency of nitrogen pollutants in traditional heavy oil processing waste water treatment plants and achieve synergistic removal of carbon and nitrogen pollutants, based on the operation parameters of the biochemical device on site and the previous research results, a pilot test device and operation parameters in a two-step-feeding anoxic/oxic(A/O) process was constructed in this paper. The side-line experiment was carried out in a heavy oil processing wastewater treatment plant with the effluent of the hydrolysis acidification unit as the treatment target. Control process conditions, the ratio of step-feed influent water is 7:3, the reflux ratio of external circulation is 1, dissolved oxygen concentration(0.1～0.4 mg/L in the anoxic zone, 3.5～4.5 mg/L in the aerobic zone), pay more attention to the effects of the reflux ratio R of internal circulation of the first-stage A/O and the amount of additional carbon source(glucose) in the denitrification stage of the second-stage A/O on the removal efficiency of nitrogen pollutants. The results show that a proper increase of the reflux ratio in internal circulation and the carbon source addition can significantly improve the total nitrogen removal capacity of the twostep-feeding A/O process and will not reduce the removal efficiency of organic pollutants. The optimum reflux ratio R value of internal recycling is 0.5, and carbon source addition is 30 mg/L, under which the removal rate of total nitrogen can reach 84.7%, and the total nitrogen mass concentration of effluent can be controlled below 10 mg/L, thus realizing the deep denitrification of heavy oil processing wastewater.
引文
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[17]项敏,陈东辉,黄满红.回流比对分段进水A2/O工艺脱氮除磷影响的小试研究[J].广州化工, 2011, 39(12):127-130.[XIANG M,CHEN D H, HUANG M H. Effect of return ration on the step feed A2/O process for nitrogen and phosphorus removel[J]. Guangzhou Chemical Industry, 2011, 39(12):127-130.]
[18]李长刚,阎光绪,郭绍辉,等.污泥回流比对两段进水A/O工艺处理重油加工污水效果的影响[J].环境工程学报, 2018, 12(10):1-7.[LI C G, YAN G X, GUO S H, et al. Effect of sludge reflux ratio on performance of two step-feed A/O process in treating heavy oil refining wastewater[J]. Chinese Journal of Environmental Engineering, 2018, 12(10):1-7.]
[19]王海东,王淑莹,彭永臻.进水负荷对硝化菌与异养菌竞争关系的影响[J].中国给水排水, 2006, 22(23):26-29.[WANG H D,WANG S Y, PENG Y Z. Influence of applied loading on competition between nitrifiers and heterotrophs[J]. China Water&Wastewater,2006, 22(23):26-29.]
[2]夏晓蓉,邹圣武.重油加工路线的优化及实践[J].中外能源, 2014, 19(06):74-79.[XIA X R, ZOU S W. The optimization and practice of heavy oil processing schemes[J]. Sino-Global Energy, 2014, 19(06):74-79.]
[3]车鑫博.劣质重油加工污水臭氧催化氧化技术研究[D].北京:中国石油大学(北京), 2011.[CHE X B. Study on tinpot oil processing wastewater treatment by ozone catalytic oxidation[D]. Beijing:China University of Petroleum(Beijing), 2011.]
[4]刘月佳.劣质重油加工污水中有机污染物组成分析[D].北京:中国石油大学(北京), 2012.[LIU Y J. Study on analysis of organic pollutants in heavy oil refinery wastwater[D]. Beijing:China University of Petroleum(Beijing), 2012.]
[5]王鑫.委内瑞拉重油加工点源废水污染物组成分析及数据库研究[D].北京:中国石油大学(北京), 2012.[WANG X. Analysis and database research on the pollutant composition of Venezuela heavy oil processing point source wastewater[D]. Beijing:China University of Petroleum(Beijing), 2012.]
[6]王江.提高重油加工污水可生化技术研究[D].大连:大连理工大学, 2015.[WANG J. Research on improving biodegradabiIity of heavy oil processing wastewater[D]. Dalian:Dalian University of Technology, 2015.]
[7]孙海.我国未来运输能源可持续化发展的路径选择[J].科学管理研究, 2009, 27(3):64-68.[SUN H. Path selection of sustainable development of china’s future transportation energy[J]. scientific management research, 2009, 27(3):64-68.]
[8]王社平,于莉芳,韩光辉,等. A/O工艺分段进水生物脱氮技术分析[J].工业用水与废水, 2006, 37(1):7-9.[WANG D P, YU L F,HAN G H, et al. Analysis of A/O step-feed biological denitrogenation process[J]. Industrial Water&Wastewater, 2006, 37(1):7-9.]
[9]ZHUGB,PENG YZ, WUS Y,etal.Simultaneous nitrification and denitrification in step feeding biological nitrogen removal process[J]. Journal of Environmental Sciences, 2007, 19(9):1043-1048.
[10]王伟,彭永臻,孙亚男,等.分段进水A/O工艺流量分配方法与策略研究[J].环境工程学报, 2009, 3(1):89-92.[WANG W, PENG Y Z, SUN Y N, et al. Study of influent flow distribution methods and strategies in step-feed A/Oproces[J]. Chinese Journal of Environmental Engineering, 2009, 3(1):89-92.]
[11]王伟,王淑莹,孙亚男,等.分段进水A/O工艺外碳源投加控制策略的比较研究[J].环境科学, 2009, 30(3):792-797.[WANG W, WANG S Y, SUN Y N, et al. External carbon addition control strategies of step-feed A/O process[J]. Environmental Science, 2009,30(3):792-797.]
[12]CAO G H, WANG S Y, PENG Y Z, et al. Biological nutrient removal by applying modified four step-feed technology to treat weak wastewater[J]. Bioresource Technology, 2013, 128:604-611.
[13]CHUNG J, KIM G, SEO K W, et al. Effects of step-feeding and internal recycling on nitrogen removal in ceramic membrane bioreactors, and their hydraulic backwashing characteristics[J]. Separation and Purification Technology, 2014, 138:219-226.
[14]祝贵兵,彭永臻,王淑莹,等. A/O工艺与分段进水两种生物脱氮工艺的比较研究[J].东南大学学报(英文版), 2008, 1(4):528-531.[ZHU G B, PENG Y Z, WANG S Y, et al. Comparative study of two biological nitrogen removal processes:A/O process and step-feeding process[J]. Journal of Southeast University(English Edition), 2008, 1(4):528-531.]
[15]ZHU G P, PENG Y Z, MA B, et al. Optimization of anoxic/oxic step feeding activated sludge process with fuzzy control model for improving nitrogen removal[J]. Chemical Engineering Journal, 2009, 151(1):195-201.
[16]PENG YZ,GESJ.Enhanced nutrient removal in three types of step feeding process from municipal waste water[J].Bioresource Technology, 2011, 102(11):6405-6413.
[17]项敏,陈东辉,黄满红.回流比对分段进水A2/O工艺脱氮除磷影响的小试研究[J].广州化工, 2011, 39(12):127-130.[XIANG M,CHEN D H, HUANG M H. Effect of return ration on the step feed A2/O process for nitrogen and phosphorus removel[J]. Guangzhou Chemical Industry, 2011, 39(12):127-130.]
[18]李长刚,阎光绪,郭绍辉,等.污泥回流比对两段进水A/O工艺处理重油加工污水效果的影响[J].环境工程学报, 2018, 12(10):1-7.[LI C G, YAN G X, GUO S H, et al. Effect of sludge reflux ratio on performance of two step-feed A/O process in treating heavy oil refining wastewater[J]. Chinese Journal of Environmental Engineering, 2018, 12(10):1-7.]
[19]王海东,王淑莹,彭永臻.进水负荷对硝化菌与异养菌竞争关系的影响[J].中国给水排水, 2006, 22(23):26-29.[WANG H D,WANG S Y, PENG Y Z. Influence of applied loading on competition between nitrifiers and heterotrophs[J]. China Water&Wastewater,2006, 22(23):26-29.]