人工湿地系统中填充基质对磷的吸附能力_陈晓

人工湿地系统中填充基质对磷的吸附能力陈晓1,贾晓梅3,侯文华1,2*,汪群慧1,31.哈尔滨工业大学市政环境工程学院,黑龙江哈尔滨1500902.中国环境科学研究院水污染控制技术研究中心,北京1000123.北京科技大学土木与环境工程学院,北京100083摘要:人工湿地中填充基质对磷的吸附、沉淀作用是湿地系统的主要除磷机制,探明基质对磷的吸附能力对人工湿地系统设计至关重要.分别利用吸附试验和柱吸附试验考察了宝钢钢渣、首钢钢渣、水淬渣和陶粒4种基质对磷的吸附能力,同时进行了浸出液毒性鉴别试验.吸附试验表明,基质对磷的吸附符合Langmuir和Freundlich模型(R2为01956~01989),采用Langmuir模型预测的基质磷吸附量为21274~31637mgPg.在为期144d的柱吸附试验中,填充宝钢钢渣和首钢钢渣的试验柱对磷有良好的去除效果,而填充水淬渣和陶粒的试验柱在90d左右达到吸附饱和状态.在试验期内,基质的累积磷吸附量:宝钢钢渣为71921mgPg,首钢钢渣为71495mgPg,水淬渣31317mgPg,陶粒为11627mgPg.浸出液毒性鉴别试验表明,4种基质均有较高的环境安全性,由于2种钢渣和水淬渣具有较高的磷去除效率和便宜的价格,在湿地系统中具有广泛的应用价值.关键词:湿地;基质;磷;吸附能力;柱吸附试验中图分类号:X13112文献标志码:A文章编号:1001-6929(2009)09-1068-06PhosphorusAdsorptionCapacityofFilterMediainConstructedWetlandsCHENXiao1,JIAXiao-mei3,HOUWen-hua1,2,WANGQun-hui1,31.SchoolofMunicipalandEnvironmentalEngineering,HarbinInstituteofTechnology,Harbin150090,China2.ResearchCenterofWaterPollutionControlTechnology,ChineseResearchAcademyofEnvironmentalSciences,Beijing100012,China3.SchoolofCivilandEnvironmentalEngineering,BeijingUniversityofScienceandTechnology,Beijing100083,ChinaAbstract:Adsorptionandprecipitationofphosphorus(P)onfiltermediaisamajorPremovalmechanisminconstructedwetlands.Therefore,determiningthePadsorptioncapacityoffiltermediaisvitaltothedesignofwetlandsystemswithhighPremovalefficiency.AdsorptionandcolumnexperimentswereconductedtodiscoverthePadsorptioncapacityoffourfiltermedia.Meanwhile,extractiontoxicityidentificationofthefiltermediawascarriedouttoensurethesafetyofthemedia.TheadsorptionexperimentshowedthattheLangmuirandFreundlichmodelsdescribedtheadsorptiondatawell(R2=01956-01989),withanestimatedPadsorptioncapacitybytheLangmuirmodelbetween21274and31637mgPg.Duringthe144dayscolumnexperiment,thecolumnsfilledwithBaogangandShougangslagshadrelativelyhigherremovalrates,whilethecolumnsfilledwithShuicuislagandzeolitereachedPsaturationafterabout90days.TheaccumulatedPadsorptioncapacityfromthecolumnexperimentwasasfollows:Baogangslag71921mgPg,Shougangslag71495mgPg,Shuicuislag31317mgPgandzeolite11627mgPg.Duetothe