Fe(Ⅱ)和Fe(Ⅲ)混凝-微濾去除廢水中As的對(duì)比研究.pdf

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1、化學(xué)工程師Sum2l2No．5ChemicalEngineer2013年第5期文章編號(hào)：1002—1124(2013)05—0032—04：環(huán)境：工Fe(1I)和Fe(1]I)一微濾去除縋廢水中的對(duì)比研究范先媛，黃青b劉紅(武漢科技大學(xué)a．資源與環(huán)境工程學(xué)院；b．耐火材料與高溫陶瓷國家重點(diǎn)實(shí)驗(yàn)室培育基地，湖北武漢430081)摘要：以混凝一微濾工藝處理5mg·L--的模擬含砷廢水，對(duì)比了FeSO和Fe(s0)混凝劑的效果。結(jié)果表明：Fe(Ⅱ)比Fe(Ⅲ)有更好的混凝效果，對(duì)As(V)的混凝一微濾去除率可達(dá)到99．21％，并且無論Fe(Ⅱ)還

2、是Fe(Ⅲ)，對(duì)As(V)的去除率均高于As(Ⅲ)。Fe(Ⅱ)和Fe(Ⅲ)水解產(chǎn)物的Zeta電位、紅外吸收光譜和x一射線衍射測試分析表明其表面電位和結(jié)構(gòu)基本相同，電中和能力相當(dāng)。比表面積和粒度分布測試結(jié)果顯示相對(duì)于Fe(Ⅲ)，F(xiàn)e(Ⅱ)水解產(chǎn)物的粒度較小，比表面積較大，說明Fe(Ⅱ)比Fe(Ⅲ)混凝效果好的原因主要是能對(duì)砷起到更好的吸附作用。掃描電鏡(sEM)圖表明鐵鹽混凝處理As(V)所形成的絮體粒度比處理As(Ⅲ)所形成的大，因此，將As(m)預(yù)氧化為As(V)可使混凝除砷絮體更易從水中分離。關(guān)鍵詞：re(Ⅱ)；re(III)；混凝一微

3、濾；除砷中圖分類號(hào)：X703．5文獻(xiàn)標(biāo)識(shí)碼：AArsenicremovalfromwaterbyFe(H)andFe(Ⅲ)FANXian—yuan，HUANGQing~，LIUHong~(a．CollegeofResourceandEnvironmentalEngineering；b．HubeiProvinceKeyLaboratoryofCeramicsandRefractories．WuhanUniversityofScienceandTechnology，Wuhan430081，China)Abstract：FeSO4andre2(S

4、O4)3wereappointedasthecoagulantstocomparethearsenicremovalfromthesyntheticwastewaterthatcontained5mg／Larsenicbycoagulation-microfiltrationprocess．TheresultsshowthatFe(H)hasbettercoagulation-microfihrationefficiencythanFe(Ⅲ)，andthel~mova]efficiencyofarsenic(V)reached99．21％．

5、Thearsenic(V)removalefficiencywashigherthanarsenic(Ⅲ)。nomatterFe(H)orFe(Ⅲ)．There—suhsofzetapotential，infraredabsorptionspectroscopyandX-raydifractionsuggestthatthesurfaceelectricpo-tentialandstructureofFe(Ⅱ)andFe(11)hydrolysisproductswerealmostsame，andthecharge-neutralizin

6、ga—bilitywereequa1．TheresultsofparticlesizedistributionandspecificsurfaceareashowthatcomparedwithFe(II1)，theparticlesizeofFe(II)hydrolysisproductsweresmallerandthespecificsurfaceareawereslightlylarg—er，whichindicatedthemainreasonofFe(Ⅱ)havingbettercoagulation—microfihratio

7、nefficiencythanFe(II)wasthatFe(Ⅱ)hadbetteradsorptionwitharsenic．Thescanningelectronmicroscope(SEM)showthattheflocspatti-clesizeofarsenic(V)werebiggerthanarsenic(11I)，therefore，As(1lI)wasoxidizedtoAs(V)canberemovedmoreeffectivelyfromwater．Keywords：Fe(H)；Fe(HI)；coagulation-m

8、icrofiltration；arsenicremoval與金屬伴生的含砷礦物在金屬的提取過程中采用混凝一微濾相結(jié)合的工藝【4．]處理含砷廢進(jìn)入環(huán)境，構(gòu)成工業(yè)含砷廢水的重要來源。