曝停比对两级SBBR处理猪场废水厌氧消化液的影响
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摘要
采用两级串联序批式生物膜法(SBBR)处理猪场废水厌氧消化液,设置运行模式a、b和c,其曝停比分别为1.5 h∶0.5 h(1级反应器)—2 h∶1 h(2级反应器)、1 h∶1 h—1.5 h∶0.5 h和1 h∶1 h—2 h∶1 h,总曝气时间分别为9.5、9.5和8.0 h,考察不同模式对废水处理效果和同步硝化反硝化等氮素转化情况的影响。结果表明,在温度为24～27℃、曝气阶段ρ(DO)控制在2.5～3.0 mg.L-1、进水ρ(COD)和ρ(NH3-N)分别为700～800和90～100mg.L-1条件下,各反应器均具有一定的脱氮能力,其中模式a效果最好,TN和NH3-N去除率分别为58.5%和68.2%。说明在两级串联SBBR反应器中,高曝停比—低曝停比的串联方式更有利于猪场废水厌氧消化液污染物的去除。通过调节每级曝气时间可将反应控制在同步硝化反硝化阶段,适当延长1级反应的曝气时间以及在2级反应初期设置1 h厌氧阶段可明显提高废水处理效果。
Two-stage Sequencing Batch Biofilm Reactors were used to process anaerobically digested pig farm wastewater.The installation was designed to have 3 operation modes,a,b and c,that is,in Mode a,the aeration/non-aeration ratio 1.5 h ∶0.5 h for the first stage reactor and 2 h ∶1 h for the second stage reactor,and the total aeration time 9.5 h;in Model b,1 h ∶1 h and 1.5 h ∶0.5 h,and 9.5 h,and in Model c,1 h ∶1 h and 2 h ∶1 h,and 8.0 h,to investigate effect of aeration/non-aeration ratio on treatment of wastewater and simultaneous nitrification and denitrification of nitrogen.Results show that when the operation had the temperature controlled in the range of 24-27 ℃,ρ(DO) at 2.5-3.0 mg·L-1 during the aeration period,ρ(COD) and ρ(NH3-N) at 700-800 and 90-100 mg·L-1,respectively in the influent,Model a was the highest in efficiency with TN and NH3-N removal rate being 58.5% and 68.2%,respectively,indicating that the combination of high aeration/non-aeration ratio with low aeration/non-aeration is more conducive to removal of pollutants in anaerobically digested pig farm wastewater.
Two-stage Sequencing Batch Biofilm Reactors were used to process anaerobically digested pig farm wastewater.The installation was designed to have 3 operation modes,a,b and c,that is,in Mode a,the aeration/non-aeration ratio 1.5 h ∶0.5 h for the first stage reactor and 2 h ∶1 h for the second stage reactor,and the total aeration time 9.5 h;in Model b,1 h ∶1 h and 1.5 h ∶0.5 h,and 9.5 h,and in Model c,1 h ∶1 h and 2 h ∶1 h,and 8.0 h,to investigate effect of aeration/non-aeration ratio on treatment of wastewater and simultaneous nitrification and denitrification of nitrogen.Results show that when the operation had the temperature controlled in the range of 24-27 ℃,ρ(DO) at 2.5-3.0 mg·L-1 during the aeration period,ρ(COD) and ρ(NH3-N) at 700-800 and 90-100 mg·L-1,respectively in the influent,Model a was the highest in efficiency with TN and NH3-N removal rate being 58.5% and 68.2%,respectively,indicating that the combination of high aeration/non-aeration ratio with low aeration/non-aeration is more conducive to removal of pollutants in anaerobically digested pig farm wastewater.
引文
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[15]方芳,杨国红,郭劲松,等.DO和曝停比对单级自养脱氮工艺影响试验研究[J].环境科学,2007,28(9):1976-1980.
[16]蒋山泉,郑泽根,肖海文,等.序批式生物膜(SBBR)同步硝化反硝化特性研究[J].安全与环境学报,2008,8(4):68-72.
[2]徐谦,余桂珍,向俐云.北京市规模化畜离养殖场污染调查与防治对策研究[J].农村生态环境,2002,18(2):24-28.
[3]张颖,邓良伟.猪场废水厌氧消化过程中的除磷效果[J].生态与农村环境学报,2012,28(1):93-97.
[4]田宁宁,王凯军,李宝林,等.畜禽养殖场粪污的治理技术[J].中国给水排水,2002,18(2):71-73.
[5]孟海玲,董红敏,朱志平,等.运行条件对膜生物反应器处理猪场厌氧消化液效果的影响[J].农业工程学报,2008,24(9):179-183.
[6]王欢,裴伟征,李旭东,等.低碳氮比猪场废水短程硝化反硝化厌氧氨氧化脱氮[J].环境科学,2009,30(3):815-820.
[7]曹玉成,张妙仙,单胜道.MBBR处理猪场废水厌氧消化液的研究[J].环境工程学报,2008,2(5):591-594.
[8]段焱,邓仕槐,朱春兰,等.悬浮填料SBR处理畜禽废水效果研究[J].安全与环境工程,2010,17(4):9-12.
[9]马文静.SBBR工艺及影响因素探讨[J].科技情报开发与经济,2010,20(10):148-149.
[10]龙北生,刘红,肖国拾,等.两级SBR工艺去除磷、氮及有机物效能分析[J].环境科学,2009,30(9):2609-2614.
[11]元新艳,沈恒根,孙磊,等.两级序批式膜生物反应器处理生活污水的研究[J].中国给水排水,2010,26(15):95-98.
[12]王荣娟,杨朝晖,曾光明,等.不同供氧策略对SBBR反应器实现短程硝化厌氧氨氧化的影响分析[J].环境科学学报,2007,27(11):1809-1817.
[13]吴长航,金云霄,冯传平,等.SBBR处理不同C/N值城市污水的脱氮除磷性能[J].中国给水排水,2010,26(23):105-108.
[14]朱春兰,邓仕槐,肖鸿,等.新型SBBR处理畜禽废水脱氮实验研究[J].环境工程学报,2010,4(7):1525-1528.
[15]方芳,杨国红,郭劲松,等.DO和曝停比对单级自养脱氮工艺影响试验研究[J].环境科学,2007,28(9):1976-1980.
[16]蒋山泉,郑泽根,肖海文,等.序批式生物膜(SBBR)同步硝化反硝化特性研究[J].安全与环境学报,2008,8(4):68-72.