gach2o2降解二级出水中溶解性有机物-gac h2o2 degrades dissolved organic matter in secondary effluent.docxVIP
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gach2o2降解二级出水中溶解性有机物-gac h2o2 degrades dissolved organic matter in secondary effluent
对GAC/H2O2降解5h后的二级出水溶解性有机物的性质进行分析,发现亲水性物质降解的比率高于疏水性有机物的比率;各分子量区间的有机物量都有所减少,但是从所占比例来看,小分子量的有机物所占比例有所增加。(4)研究了GAC的重复利用能力。GAC的重复使用实验证明:GAC在经过两次回用后UV254的降解率为32%,COD的降解率为14%,较第一次分别减少了22%和8%。可见降解效果随着GAC的回用次数增加而降低,但是回用的GAC仍然具有一定的催化能力。GAC/H2O2/UV连续实验表明,连续运行60h 后,GAC/H2O2/UV体系的降解能力逐渐减弱,但在60h时仍然能够降解二级出水中的部分有机物。通过测定GAC表面酸性含氧官能团,表明反应后GAC表面酸性含氧官能团增加,可能是导致其催化能力下降的原因之一。关键词:活性炭催化、过氧化氢、紫外、二级出水、溶解性有机物、化学需氧量H2O2oxidationofdissolvedorganicmatterin secondary effluentcatalyzedbyGACAbstractWastewaterreuseattractsmoreandmoreattentionasaneffectivemethodto rationallyutilizefreshwaterresources.Secondaryeffluenttreatedbythesewage treatmentplantcandirectlydischargeintothewater,however,thesecondaryeffluent whichcontainscomplexbio-refractorydissolvedorganicmattercannotbedirectly usedas asecurityreusewater.Ithasbeenwelldevelopedtodegradatebio-refractoryorganicmatterindrinking waterandfactorywastewaterbyadvancedoxidationprocesses(AOPs).Granular activatedcarbon(GAC)/peroxidehydrogen(H2O2)andultraviolet(UV)/H2O2are attributabletoAOPs.Inthisstudy,thedissolvedorganicmatterinsecondaryeffluent isdegradatedbyGAC/H2O2aswellasGAC/H2O2/UV.Thespecificcontentsareas follows:Theeffectsofdegradationofthe dissolved organicmatterinsecondary effluentbyGAC/H2O2wareresearchedinthispart. Theresultsshowedthat the degradationratebyGAC/H2O2 washigherthanthatseparatelybyGACorH2O2.Intheconditions ofthat1.0g/LGAC(coal,columnar,specificsurfacearea1200m2/g),0.3mL/LH2O2(w/w,30%),pH=2,thedegradationratioof chemicaloxygen demand(COD) reached22%andtheremoval ofabsorbanceat254nm(UV254) reached54%.DifferentGAChaddifferentadsorptioncapacityorcatalyticability. DegradationratefirstincreasedandthendecreasedwiththedosageofH2O2.The degradationrateincreasedwiththedosageofGAC.Thedegradationofdissolved organicmatter tookplaceintherangeofpH=2topH=10.Theacidicconditionwas relativelybetter thanbasiccondition.Tostrengthenthedegradation ofdissolvedorganicmatterinsecondary effluentandimprovetheutilizationofH2O2,UVwasappliedto thesystemof GAC/H2O
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