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《大沽排污河底泥释放总氮的影响-论文.pdf》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、第32卷第2期环境科学学报V0I.32.No.22012年2月ActaScientiaeCircumstantiaeFeb.,2012荣伟英,周启星.2012.大沽排污河底泥释放总氮的影响[J].环境科学学报,32(2):326.331RongWY,ZhouQx.2012.InfluencingfactorsoftotalnitrogenreleasefromsedimentsintheDagudrainagefiver[J].AetaScientiaeCircumstantiae,32(2):326.331大沽排污河底泥释放总氮的影响荣伟英,周启星
2、南开大学环境科学与工程学院,环境污染过程与基准教育部重点实验室,天津市城市生态环境修复与污染防治重点实验室,天津300071收稿日期:2011—04—04修回日期:2011.07.05录用日期:2011—07.15摘要:在实验室模拟条件下,考察了上覆水的溶解氧DO、pH值、温度、含盐量及扰动速率等环境因子对大沽排污河底泥释放总氮的影响.结果表明:厌氧条件下底泥释放总氮的强度高于好氧条件和自然条件下的释放强度;上覆水的pH呈中性时底泥释放总氮的强度最大,酸性条件下底泥释放总氮的强度高于碱性条件;升高温度可促进底泥释放总氮;扰动可提高底泥释放总氮的强度,
3、但当扰动速率增加到一定程度时,反_面会抑制总氮的释放,因此,至最后实验结束时,扰动速率为6Or·minI1的体系中底泥释放总氮的能力最强;当实验达到平衡时,含盐量为0mg·L的体系中底泥释放总氮的能力最强.关键词:底泥;总氮;环境因子;上覆水文章编号:0253-2468(20l2)02—326—06中图分类号:X171文献标识码:AInfluencingfactorsoftotalnitrogenreleasefromsedimentsintheDagudrainageriverRONGWeiying,ZHOUQixingMOEKeyLaborato
4、ryofPollutionProcessesandEnvironmentalCriteria,TianjinKeyLaboratoryofEnvironmentalRemediationandPollutionControlCollegeofEnvironmentalScienceandEngineering,NankaiUniversity,Tianjin300071Received4April2011;receivedinrevisedform5July2011;accepted15July2011Abstract:Theeffectofenvi
5、ronmentalfactorsincludingdissolvedoxygen(DO)inoverlyingwateranditspH,temperatureandsalinity,andvelocityofdisturbanceonthereleaseoftotalnitrogenfromsedimentsoftheDagudrainageriverwereinvestigatedundersimulatedtestconditions.Theresultsshowedthatwhenoverlyingwaterwasinanaerobiccon
6、ditions,theintensityoftotalnitrogenreleasewashigherthanthatunderaerobicandnaturalconditions.TheintensityoftotalnitrogenreleasefromsedimentsreachedthehighestlevelwhenpHoftheoverlyingwaterwasneutral,andtheintensityoftotalnitrogenreleasefromsedimentswashigherwhentheoverlyingwaterw
7、asacidicthanalkaline.Anincreaseintemperaturecouldpromotethereleaseoftotalnitrogenfromsediments.Thedisturbanceofoverlyingwatercouldincreasetheintensityoftotalnitrogenreleasefromsediments.However,theintensityoftotalnitrogenreleasedecreasedwhenthevelocityofdisturbancewastoohigh.Th
8、eintensityoftotalnitrogenreleasewashighestwiththeveloc
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