秸秆碳源对高硝氮含量水体脱氮效果实验研究
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摘要
针对高含氮水体往往存在碳源不足,需要补充碳源的问题,以农林废弃物油菜秸秆作为外加碳源,对不同高含氮的水体进行了生物反硝化脱氮实验研究。结果表明,油菜秸秆在NO_3~--N含量相对较低的水体情况下脱氮效果较好,可以作为良好的缓释碳源,当NO_3~--N的质量浓度为20 mg/L时,脱氮效果最好,NO_3~--N负荷为31 mg/(L·d);当NO_3~--N的质量浓度大于30 mg/L时,因秸秆释碳不足,NO_3~--N去除率减小。不同浓度NO_3~--N水体的NO_3~--N去除率差别较大,但脱氮负荷较为接近,说明高含量NO_3~--N水体的脱氮效果主要与秸秆释碳量有关,受碳源影响。
Aimed at the carbon source of water with high nitrogen concentration is often insufficient so that exogenous carbon source is required. The biological denitrification of water bodies with different high nitrogen content was studied in this experiment, and agricultural wastes, rape straws was added as carbon source. The results showed that the rape straw could be ideal sustainably releasing carbon resource when the NO_3~--N content was relatively low,which obtained the highest NO_3~--N removal rates, when mass concentration of NO_3~--N was 20 mg/L, and the NO_3~--N load was 31 mg/(L·d). When mass concentration of NO_3~--N was higher than 30 mg/L, NO_3~--N removal rates decreased because of the insufficient carbon resource. Though the NO_3~--N removal rates were larger difference when NO_3~--N concentrations were different, but denitrifying loads were close, which meant the denitrification effect of water bodies containing high NO_3~--N content was mainly related to the carbon emission capacity of straw and was controlled by carbon resource.
Aimed at the carbon source of water with high nitrogen concentration is often insufficient so that exogenous carbon source is required. The biological denitrification of water bodies with different high nitrogen content was studied in this experiment, and agricultural wastes, rape straws was added as carbon source. The results showed that the rape straw could be ideal sustainably releasing carbon resource when the NO_3~--N content was relatively low,which obtained the highest NO_3~--N removal rates, when mass concentration of NO_3~--N was 20 mg/L, and the NO_3~--N load was 31 mg/(L·d). When mass concentration of NO_3~--N was higher than 30 mg/L, NO_3~--N removal rates decreased because of the insufficient carbon resource. Though the NO_3~--N removal rates were larger difference when NO_3~--N concentrations were different, but denitrifying loads were close, which meant the denitrification effect of water bodies containing high NO_3~--N content was mainly related to the carbon emission capacity of straw and was controlled by carbon resource.
引文
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[2]ORIOL G,SYLWIA P,IVAN R,et al.Selection of organic substrates as potential reactive materials for use in a denitrification permeable reactive barrier(PRB)[J]Bioresource Technology,2008,99:7587-7596.
[3]文冬光,林良俊,孙继朝,等.中国东部主要平原地下水质量与污染评价[J]地球科学-中国地质大学学报,2012,37(2):220-228.
[4]SAEED T,SUN G Z.A review on nitrogen and organics removal mechanisms in subsurface flow constructed wetlands:Dependency on environmental parameters,operating conditions and supporting media[J]Journal of Environmental Management,2012,112:429-448.
[5]SALILING W J B,WESTERMAN P W,LOSORDO T M.Wood chips and wheat straw as alternative biofilter media for denitrification reactors treating aquaculture and other wastewaters with high nitrate concentrations[J].Aquacultural Engineering,2007,37(3):222-233.
[6]邵留,徐祖信,金伟,等.以稻草为碳源和生物膜载体去除水中的硝酸盐[J].环境科学,2009,30(5):1414-1419.
[7]SOARES M I M,ABELIOVICH A.Wheat straw as substrate for water denitrification[J]Water Research,1998,32(12):3790-3794.
[8]GUTIERREZ-WING M T,MALONE R F,RUSCH K A.Evaluation of polyhydroxybutyrate as a carbon source for recirculating aquaculture water denitrification[J].Aquacultural Engineering,2012,51:36-43.
[9]YANG X L,JIANG Q,SONG H L,et al.Selection and application of agricultural wastes as solid carbon sources and biofilm carriers in MBR[J].Journal of Hazardous Materials,2015,283:186-192.
[10]XU Z X,SHAO L,YIN H L,et al.Biological denitrification using corncobs as a carbon source and biofilm carrier[J].Water Environment Research A Research Publication of the Water Environment Federation,2009,81(3):242-247.
[11]SHAO L,XU Z X,YIN H L,et al.Rice husk as carbon source and biofilm carrier for water denitrification[J].Polish Journal of Environmental Studies,2009,136(4):693-699.
[12]王磊,王亚静,高春雨,等.中国油菜秸秆资源量估算及其资源化利用[C].2015年中国农业资源与区划学会学术年会,2015.
[13]张蓓蓓,马颖,耿维,等.中国油菜秸秆资源的生物质能源利用潜力评价[J].可再生能源,2017,35(1):126-134.
[14]国家环境保护总局《水和废水监测分析方法》编委会.水和废水监测分析方法[M].4版.北京:中国环境科学出版社,2002.
[15]RUIZA G,JEISONB D,CHAMY R.Nitrification with high nitrite accumu-lation for the treatment of wastewater with high ammonia concentration[J].Water Research,2003,37:1371-1377.
[16]WARNEKE S,SCHIPPER L A,MATIASEK M G.Nitrate removal,communities of denitrifiers and adverse effect s in different carbon substrates for use in denitrification beds[J].Water Research,2011,45:5463-5475.
[17]WEN Y,CHEN Y,ZHENG N,et al.Effects of plant biomass on nitrate removal and transformation of carbon sources in subsurfaceflow constructed wetlands[J].Bioresource Technology,2010,101:7286-7292.
[18]ASLANA,T譈RKMANB A.Combined biological removal of nitrate and pesticides using wheat straw as substrates[J].Process Biochemistry,2005,40(2):935-943.
[19]WANG Y,PENG Y,STEPHENSON T.Effect of influent nutrient ratios and hydraulic retention time(HRT)on simultaneous phosphorus and nitrogen removal in a two-sludge sequencing batch reactor process[J].Bioresour Technol,2009,99(14):3506-3512.
[20]BRETTAR I,TR魪MOLI魬RES M,P魪REZ J S.Nitrate elimination by denitrification in hardwood forest soils of the Upper Rhine floodplain-correlation with redox potential and organic matter[J].Hydrobiologia,2002,469(1/3):11-21.
[21]HENDRIKUS J.LAANBROEK,SASKIA G.Competition for limiting amounts of oxygen between Nitrosomonas europaea and Nitrobacter winogradskyi grown in mixed continuous cultures[J]Arch Microbxol,1993,159:453-459.