底泥就地稳定化中零价铁(Fe~0)对有机污染物的作用及其对上覆水体水质的影响
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摘要
在实验室模拟静态湖泊体系条件下,通过向实际底泥中投加零价铁(Fe~0),考察反应前后底泥中有机物数量、种类、总有机质含量以及上覆水体溶解氧(DO)浓度、氧化还原电位(Eh)、pH和化学需氧量(CODCr)浓度等指标的变化,探讨Fe~0对底泥有机物的降解效果以及对上覆水体水质的影响.结果表明,投加Fe~0处理80 d后,(1)经GC-MS检测出底泥中易被降解的小分子有机物(分子量小于200)数量明显增多,底泥总有机去除率为44%.(2)上覆水体的DO浓度、Eh和pH都有不同程度的变化.DO浓度从6.6 mg/L迅速下降至0.2 mg/L,Eh从150 mV左右下降至74 mV,pH升高至8.4,此体系易形成厌氧环境;且上覆水体中CODCr低于纯底泥-水体系,上覆水中DO浓度、Eh及pH与CODCr浓度具有一定相关性.综上,底泥中投加Fe~0可有效降解有机物,且不会对上覆水体产生持久、较大的影响.
Based on the laboratory simulates a static lake system,the removal of organic pollutants in sediments using zero-valent iron( Fe~0) for in-situ sediment treatment was studied. The effects of zero valent iron( Fe~0) on the overlying water including DO,Eh,pH and CODCrwere investigated and the effects on the sediments including the number and kinds of organic pollutants,total organic content were discussed. The results showed that with adding Fe~0 for treating 80 days,(1) the amount of low-molecularweight organics( of below200) were increasing apparently which could be easy to degrade detecting by GC-MS. The removal rate of organic content in sediments was around 44%.(2) the value of pH was rising to 8.4,while the Eh was declining from 150 mV to 74 mV and the DO concentration of overlying water depleted dramatically from 6.6 mg/L to 0.2 mg/L. The system formed an anaerobic environment. CODCrconcentration of overlying water was lower than that in pure bottom-water system. In addition,there were certain relations among DO,Eh,pH and CODCrin overlying water. In conclusion,the removal of organic pollutants was effective by adding Fe~0 in the sediments,and this effect on overlying water quality was not permanent and seriously.
Based on the laboratory simulates a static lake system,the removal of organic pollutants in sediments using zero-valent iron( Fe~0) for in-situ sediment treatment was studied. The effects of zero valent iron( Fe~0) on the overlying water including DO,Eh,pH and CODCrwere investigated and the effects on the sediments including the number and kinds of organic pollutants,total organic content were discussed. The results showed that with adding Fe~0 for treating 80 days,(1) the amount of low-molecularweight organics( of below200) were increasing apparently which could be easy to degrade detecting by GC-MS. The removal rate of organic content in sediments was around 44%.(2) the value of pH was rising to 8.4,while the Eh was declining from 150 mV to 74 mV and the DO concentration of overlying water depleted dramatically from 6.6 mg/L to 0.2 mg/L. The system formed an anaerobic environment. CODCrconcentration of overlying water was lower than that in pure bottom-water system. In addition,there were certain relations among DO,Eh,pH and CODCrin overlying water. In conclusion,the removal of organic pollutants was effective by adding Fe~0 in the sediments,and this effect on overlying water quality was not permanent and seriously.
引文
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[17]Xiao LP,Guo Y,Deng ZY.Characteristics of direct black 19 decolorized by the bacterium Pseudomonas fluorescence and Fe0integrated treatment system.Acta Scientiae Circumstantiae,2013,33(9):2504-2510.[肖利平,郭燕,邓志毅等.Fe0/荧光假单胞菌联合处理直接耐晒黑的脱色特性.环境科学学报,2013,33(9):2504-2510.]
[18]Ardo F,Santos A,Romero A et al.Fate of iron and polycyclic aromatic hydrocarbons during the remediation of a contaminated soil using iron-activated persulfate:A column study.Sci Total Environ,2016,566/567:480-488.
[2]Han Q,Xue S,Liu Y et al.Release pathway and influencing factors of dissolved organic matter in river sediments.China Environmental Science,2016,36(12):3737-3749.[韩琦,薛爽,刘影等.河流底泥中溶解性有机物的释放途径及影响因素研究.中国环境科学,2016,36(12):3737-3749.]
[3]Song B,Zeng G,Gong J et al.Evaluation methods for assessing effectiveness of in situ remediation of soil and sediment contaminated with organic pollutants and heavy metals.Environment International,2017,105:43.
[4]Cao M,Ye Y,Chen J et al.Remediation of arsenic contaminated soil by coupling oxalate washing with subsequent ZVI/Air treatment.Chemosphere,2015,144:1313.
[5]Huaping D,Ya C,Guodong S et al.The roles of a pillared bentonite on enhancing Se(VI)removal by ZVI and the influence of co-existing solutes in groundwater.Journal of Hazardous Materials,2016,304(3):306-312.
[6]Sneath HE,Hutchings TR,de Leij FA.Assessment of biochar and iron filing amendments for the remediation of a metal,arsenic and phenanthrene co-contaminated spoil.Environmental Pollution,2013,178(1):361-366.
[7]Ahn JY,Kim C,Kim HS et al.Effects of oxidants on in situ treatment of a DNAPL source by nanoscale zero-valent iron:A field study.Water Res,2016,107:57-65.
[8]Wang XX,Zhang Y,Wang YF et al.Remediation of sediments contaminated with 1,3-dichlorobenzene using zero-valent iron.Research of Environmental Sciences,2009,22(3):289-293.[王新新,张颖,王元芬.零价铁修复1,3-二氯苯污染底泥.环境科学研究,2009,22(3):289-293.]
[9]Dong Y,Zou LP,Zhang XL.Preliminary study on the organics in top sediments of Suzhou Creek in Shanghai.Advances In Water Science,2008,19(4):494-499.[董煜,邹联沛,张晓岚.苏州河上海市区段底泥有机物的初步研究.水科学进展,2008,19(4):494-499.]
[10]Crane RA,Scott TB.Nanoscale zero-valent iron:future prospects for an emerging water treatment technology.Journal of Hazardous Materials,2012,211/212:112-125.
[11]Xu SY,Chen ZL et al eds.Pollution and treatment for sediment of Suzhou River.Beijng:Science Press,2003:1-90.[许世远,陈振楼等.苏州河底泥污染与整治.北京:科学出版社,2003:1-90.]
[12]Zhang K,Li B,Wang DZ et al.Contaminant(CODCr)release from river bottom sediments under flow conditions.Acta Scientiae Circumstantiae,2010,30(5):985-989.[张坤,李彬,王道增.动态水流条件下河流底泥污染物(CODCr)释放研究.环境科学学报,2010,30(5):985-989.]
[13]El-Temsah YS,Sevcu A,Bobcikova K et al.DDT degradation efficiency and ecotoxicological effects of two types of nanosized zero-valent iron(n ZVI)in water and soil.Chemosphere,2016,144:2221-2228.
[14]Wang C,Xi JY,Hu HY et al.Comparision of microbial metabolic characteristics in UV-biofilter treatment process.Acta Scientiae Circumstantiae,2010,30(8):1587-1592.[王灿,席劲瑛,胡洪营等.紫外-生物过滤联合工艺和单一生物过滤工艺中微生物代谢特性的比较.环境科学学报,2010,30(8):1587-1592.]
[15]Zhou HY,Nie YZ,Chen Y et al.Effects of EDTA on the reductive dechlorination of 2,4-D by Pd/Fe.Environmental Science,2016,37(2):595-601.DOI:10.13227/2016.02026.[周红艺,聂亚中,陈勇等.EDTA对Pd/Fe体系还原脱氯2,4-D的影响.环境科学,2016,37(2):595-601.]
[16]Zhou HY,Chen Y,Liang S et al.Catalytic dechlorination of 2,4-D in aqueous solution by nanoscale Pd/Fe in the presence of EDTA.Acta Scientiae Circumstantiae,2017,37(2):671-679.[周红艺,陈勇,梁思等.EDTA优化纳米Pd/Fe对2,4-D的催化脱氯研究.环境科学学报,2017,37(2):671-679.]
[17]Xiao LP,Guo Y,Deng ZY.Characteristics of direct black 19 decolorized by the bacterium Pseudomonas fluorescence and Fe0integrated treatment system.Acta Scientiae Circumstantiae,2013,33(9):2504-2510.[肖利平,郭燕,邓志毅等.Fe0/荧光假单胞菌联合处理直接耐晒黑的脱色特性.环境科学学报,2013,33(9):2504-2510.]
[18]Ardo F,Santos A,Romero A et al.Fate of iron and polycyclic aromatic hydrocarbons during the remediation of a contaminated soil using iron-activated persulfate:A column study.Sci Total Environ,2016,566/567:480-488.