水力停留时间对天然纤维素类固体碳源反硝化滤池处理效果的影响
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摘要
为了有效去除低C/N(质量比)生活污水中的TN,考察了水力停留时间(HRT)对以稻秆、玉米芯和大豆壳等天然纤维素为填料和固体碳源(以下简称碳源)的反硝化滤池的脱氮效果的影响,从COD、TN、TP去除规律和不同阶段释碳速率的变化,分析和比较不同HRT和碳源种类下反硝化滤池的脱氮性能,获得了不同碳源对应的最佳HRT,并探讨了最适碳源种类。以稻秆、玉米芯、大豆壳为碳源时,反硝化滤池的最佳HRT分别为2.0、2.0、4.0h,出水TN分别为0.3、0.2、0.4mg/L,TN去除率均为97.8%以上,此时出水COD、TP分别为37.6～44.9、0.4～0.6mg/L。玉米芯释碳速率低,释碳持久稳定,投加玉米芯为碳源的反硝化滤池在4个月后仍可保持高效、稳定的反硝化脱氮性能。
In order to effectively remove TN from low C/N(mass ratio)domestic sewage,the effect of hydraulic retention time(HRT)on performance of denitrification filter with natural cellulose as filler and solid carbon source,such as rice stalk,corn cob and soybean hull,was investigated.The COD,TN,TP removal efficiency and the carbon release rate of denitrification filter with different carbon sources were analyzed and compared at different HRT.The optimal HRT of each carbon source was obtained,and the proper carbon source was discussed.When rice stalk,corn cob and soybean hull were used as solid carbon sources,the optimal HRT of denitrification filters were 2.0,2.0 and 4.0 h,respectively,and the average effluent TN were 0.3,0.2 and 0.4 mg/L,respectively.All the removal rates of TN were above 97.8%,meanwhile the effluent COD and TP were 37.6-44.9 and 0.4-0.6 mg/L,respectively.Corn cob could maintain stable and low rate carbon release.It was demonstrated that denitrification filter with corn cob as carbon source could achieve high efficiency and stable denitrification performance for more than 4 months.
In order to effectively remove TN from low C/N(mass ratio)domestic sewage,the effect of hydraulic retention time(HRT)on performance of denitrification filter with natural cellulose as filler and solid carbon source,such as rice stalk,corn cob and soybean hull,was investigated.The COD,TN,TP removal efficiency and the carbon release rate of denitrification filter with different carbon sources were analyzed and compared at different HRT.The optimal HRT of each carbon source was obtained,and the proper carbon source was discussed.When rice stalk,corn cob and soybean hull were used as solid carbon sources,the optimal HRT of denitrification filters were 2.0,2.0 and 4.0 h,respectively,and the average effluent TN were 0.3,0.2 and 0.4 mg/L,respectively.All the removal rates of TN were above 97.8%,meanwhile the effluent COD and TP were 37.6-44.9 and 0.4-0.6 mg/L,respectively.Corn cob could maintain stable and low rate carbon release.It was demonstrated that denitrification filter with corn cob as carbon source could achieve high efficiency and stable denitrification performance for more than 4 months.
引文
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[2]GINIGE M P,BOWYER J C,FOLEY L,et al.A comparative study of methanol as a supplementary carbon source for enhancing denitrification in primary and secondary anoxic zones[J].Biodegradation,2009,20(2):221-234.
[3]WU W Z,YANG L H,WANG J L.Denitrification performance and microbial diversity in a packed-bed bioreactor using PCL as carbon source and biofilm carrier[J].Applied Microbiology and Biotechnology,2013,97(6):2725-2733.
[4]LYU W L,HUANG L,XIAO G Q,et al.Effects of carbon sources and COD/N ratio on N2O emissions in subsurface flow constructed wetlands[J].Bioresource Technology,2017,245:171-181.
[5]刘佳,沈志强,周岳溪,等.聚丁二酸丁二醇酯(PBS)为反硝化固体碳源的脱氮特性研究[J].环境科学,2014,35(7):2639-2644.
[6]罗国芝,董明来,刘倩,等.以聚丁酸丁二醇酯为碳源去除含盐水体硝酸盐的研究[J].环境污染与防治,2013,35(3):20-25.
[7]金虎,刘虹,谷风.以可塑淀粉生物降解材料为碳源去除水体中硝酸盐的研究[J].水处理技术,2010,36(12):106-108.
[8]LI G C,CHEN J,YANG T,et al.Denitrification with corncob as carbon source and biofilm carriers[J].Water Science&Technology,2012,65(7):1238-1243.
[9]CAO X,LI Y X,JIANG X Y,et al.Treatment of artificial secondary effluent for effective nitrogen removal using a combination of corncob carbon source and bamboo charcoal filter[J].International Biodeterioration&Biodegradation,2016,115:164-170.
[10]LE H T,JANTARAT N,KHANITCHAIDECHA W,et al.Utilization of waste materials for microbial carrier in wastewater treatment[J].BioMed Research International,2016,2016:1-6.
[11]丁绍兰,谢林花,马蕊婷.壳类生物质释碳性能研究[J].环境污染与防治,2016,38(10):1-5.
[12]THIRD K A,BURNETT N,CORD RUWISCH R.Simultaneous nitrification and denitrification using stored substrate(PHB)as the electron donor in an SBR[J].Biotechnology&Bioengineering,2003,83(6):706-720.
[13]刘梦盈.纤维素降解菌对生物反硝化固体碳源的影响研究[D].重庆:重庆大学,2016.
[14]王雷,席北斗,张列宇,等.序批式生物膜反应器处理农村生活污水的填料对比研究[J].环境污染与防治,2012,34(7):29-35.
[15]吉芳英,白婷婷,张千,等.固体碳源反硝化滤池脱氮效果及沿程生化特性[J].环境工程学报,2017,11(3):1347-1354.
[16]龚珊,吉芳英,张千,等.基于固体碳源反硝化的低碳源污水生物硝化技术[J].中国给水排水,2016,32(9):30-34.
[17]叶姜瑜,项宏伟,王宗萍,等.固体碳源及生物强化CAST工艺处理低C/N生活污水的效果[J].安徽农业科学,2017,45(19):58-61.
[18]LI P,ZUO J N,XING W,et al.Starch/polyvinyl alcohol blended materials used as solid carbon source for tertiary denitrification of secondary effluent[J].Journal of Environmental Sciences,2013,25(10):1972-1979.
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