水耕植物过滤法对溶解性氮磷去除的影响因子_李先宁

第35卷第5期2005年9月东南大学学报(自然科学版)JOURNALOFSOUTHEASTUNIVERSITY(NaturalScienceEdition)Vol.35No.5Sep.t2005水耕植物过滤法对溶解性氮磷去除的影响因子李先宁1宋海亮1吕锡武1西村修2稻森悠平3(1东南大学土木工程学院,南京210096)(2日本东北大学土木工程系,仙台980-77)(3日本国立环境研究所,筑波305-0053)摘要:为改善水耕植物过滤法(HBFM)对溶解性氮、磷的去除效果,通过室内模拟试验定量分析HBFM试验床中植物吸收、底泥释放及生物脱氮3个影响因子的作用.试验结果表明:底泥NH4+-N释放速率滤床上游高出中游及下游的1.6～3倍;水相的高溶解氧条件抑制了底泥释放PO43--P;试验床中植物平均氮吸收量、底泥平均氮释放量和微生物平均脱氮量分别为352.9,492.8和153.1mg/(m2d),植物吸收与微生物脱氮量之和近似等于底泥氮释放量.因此合理控制底泥清除周期减少底泥释放量,是提高HBFM溶解性氮、磷去除能力的重要途径之一.关键词:水耕植物过滤法;植物吸收;底泥释放;生物脱氮;人工湿地中图分类号:X171.4;X524文献标识码:A文章编号:1001-0505(2005)05-0792-05Factorsaffectingdissolvednitrogenandphosphorusbyhydroponicbio-filtermethodLiXianning1SongHailiang1LüXiwu1OsamuNishimura2YuheiInamori3(1CollegeofCivilEngineering,SoutheastUniversity,Nanjing210096,China)(2DepartmentofCivilEngineering,TohokuUniversity,Sendai980-77,Japan)(3NationalInstituteforEnvironmentalStudies,Tsukuba305-0053,Japan)Abstract:Therolesofplantabsorption,sedimentreleaseanddenitrificationwerequantitativelyana-lyzedbyindoorsimulatingtestsinordertoimproveremovaleffectofhydroponicbio-filtermethod(HBFM)fordissolvednitrogenandphosphorus.Accordingtothetestresults,theNH4+-Nreleasefromsedimentmainlyoccursinupperpast,anditsreleaserateis1.6to3timeshigherthanthatinmiddleandlowerpas.tThereleaserateofPO43--Pbysedimentissmallbecauseofthehighlevelofdissolvedoxygeninfilterbedwaterphase.Theaverageabsorptionrateofnitrogenbyplants,nitro-genreleaseratefromsedimentanddenitrificationrateare352.9,492.8and153.1mg/(m2d)re-spectively.Thesumofnitrogenremovedbydenitrificationandplantassimilationisapproximatelyequaltotheamountreleasedbysedimen.tReducingthenutrientquantityreleasedbysedimentthroughmanipulatingtheperiodfordiggingupsedimentisnecessarytoenhanceremovalabilityofHBFMfordissolvednitrogenandphosphorus.Keywords:hydroponicbio-filtermethod;plantabsorption;sedimentrelease;denitrification;con-structedwetland收稿日期:2004-10-22.基金项目:国家高技术研究发展计划(863计划)资助项目(2002AA601012-1A)、国家自然科学基金资助项目(50378014)、江苏省自然科学基金资助项目(BK2004075).作者简介:李先宁(1964—),男,博士,副