資源描述：
《鐵鹽預(yù)混凝對(duì)微濾膜污染的影響》由會(huì)員上傳分享，免費(fèi)在線閱讀，更多相關(guān)內(nèi)容在教育資源-天天文庫(kù)。
1、第40卷第10期北京工業(yè)大學(xué)學(xué)報(bào)Vol．40No．102014年10月JOUＲNALOFBEIJINGUNIVEＲSITYOFTECHNOLOGYOct．2014鐵鹽預(yù)混凝對(duì)微濾膜污染的影響王錦，羅東平，曹成艷(北京交通大學(xué)土木工程學(xué)院，北京100044)摘要:針對(duì)混凝－微濾工藝，為優(yōu)化鐵鹽預(yù)混凝條件及揭示不同凝聚體特性對(duì)膜污染的影響，分析了三氯化鐵(ferricchloride，F(xiàn)C)和聚合硫酸鐵(polymericferricsulfate，PFS)在不同投加量(0.1、0.2、0.4、0.6mmol/L)和混凝pH(4.5、5.5、6.5、7.5)條件下對(duì)水中天然有機(jī)物－腐植酸的去
2、除率和膜污染的影響規(guī)律．實(shí)驗(yàn)結(jié)果表明:當(dāng)酸性pH4.5～5.5電性中和機(jī)理為主時(shí)，PFS低投藥量(0.1～0.2mmol/L)凝聚體顆粒大而密實(shí)，膜過濾中通量下降緩慢，膜污染程度輕，此時(shí)聚鐵水解產(chǎn)物的高電荷比單鐵更有利于電中和;中性pH6.5～7.5卷掃混凝時(shí)，F(xiàn)C高投藥量(0.4～0.6mmol/L)緩解膜污染的作用更明顯，此時(shí)單鐵水解產(chǎn)物卷掃混凝形成凝聚體的顆粒粒徑更大．可見，混凝凝聚體顆粒大小與結(jié)構(gòu)特性，是膜污染的直接影響因素，大而密實(shí)的顆粒有利于增加膜通量，同時(shí)提高出水水質(zhì)．關(guān)鍵詞:混凝;微濾;腐植酸;Zeta電位;顆粒粒度;膜污染中圖分類號(hào):X254文獻(xiàn)標(biāo)志碼:A文章編號(hào):02
3、54－0037(2014)10－1547－07InfluenceofIronSaltsPre-coagulationonFoulingofMicrofiltrationMembraneWANGJin，LUODong-ping，CAOCheng-yan(SchoolofCivilEngineering，BeijingJiaotongUniversity，Beijing100044，China)Abstract:Tooptimizetheironpre-coagulationconditionandclarifytheinfluenceofdifferentaggregatescharact
4、eristicsonmembranefoulingforcoagulation-microfiltration(MF)process，pre-coagulationconditionsofferricchloride(FC)andpolymericferricsulfate(PFS)atdifferentcoagulantdosages(0.1，0.2，0.4，0.6mmol/L)andcoagulationpHvalues(4.5，5.5，6.5，7.5)wereanalyzedtorevealmembranefoulingmechanismsandhumicacidremoval．Ｒ
5、esultsshowthatunderacidicpH4.5－5.5ofelectricalneutralizationcoagulationcondition，thelowerPFSdosage(0.1－0.2mmol/L)hasthebettercoagulationeffect，whichtheagglomerateshavelargerparticlesizeandhigherfractaldimensionformorehighpositivechargeproducedbypolymericferrichydrolysisproductshaveanadvantageinch
6、argeneutralizationincomparisonwithFC．Thusmembranefluxdeclinationissloweddownandmembranefoulingisalleviated．UnderneutralpH6.5－7.5ofsweepcoagulation，thehigherdosage(0.4－0.6mmol/L)ofFCissuperiortoreducemembranefouling，ashydrolysisproductsofFCisliabletoproducelargerparticlesinsweepcoagulation．Particl
7、esizeandstructuralcharacteristicsofthecoagulationagglomeratesdirectlyaffectthemembranefouling，thelargerparticlesizeandhigherfractaldimensionaresuperiortoincreasemembranefluxandsimultaneouslyimprovewaterquality．Keywords
