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《【环境工程专业】【毕业论文+开题报告+文献综述】制革厂铬鞣废液预处理方法及回用方案研究》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
1、(20届)毕业设计制革厂铬鞣废液预处理方法及回用方案研究II摘要本文以毛皮铬鞣废液为研究对象,探寻其循环利用的方法。通过絮凝法和滤料过滤法处理铬鞣废液,控制实验条件,使铬鞣废液的有机物含量大大降低,而对废液中铬含量影响甚小,从而达到铬鞣废液可以回用的目的。研究结果表明:采用絮凝法,以浓度为10%的絮凝剂聚合氯化铝(PAC)处理铬鞣废液,其投加量为254mg/L,pH值为4.07时,对CODcr的去除率可达到19.95%,絮凝前后的铬含量分别为10.334g/l、9.260g/l;采用滤料过滤法,以硅胶为滤料时,对CODcr的去除率可达到44.50%,过滤前后的铬含量分别为10.334g/l
2、、9.145g/l;以活性炭(粗、细)为滤料时,对CODcr的去除率分别可达到59.29%、59.02%,过滤前后的铬含量分别为10.334g/l、9.336g/l和10.334g/l、9.145g/l;当河沙为滤料时,对CODcr的去除率为4.88%,过滤前后铬浓度分别为10.334g/l、9.145g/l。通过比较,从经济性和实用性等各方面考虑,认为絮凝法是铬鞣废液循环利用的最佳方案。关键词:铬鞣废液;PAC;过滤法;循环利用IIPretreatmentandrecyclingschemeforchormetanningtannerywastewaterAbstractInthispa
3、per,furwastechrometanningastheresearchobject,toexplorewaysofitsrecycling.Flocculationandfilterthroughfilterchrometanningwastewatertreatmenttocontroltheexperimentalconditions,sothatliquidchrometanningsignificantlyreducetheorganiccontent,whiletheimpactofwastewaterinverysmallchromium,chrometanningino
4、rdertoachievethereuseofwastewater.Theresultsshowthattheuseofflocculationtoflocculantchloride(PAC)whatconcentrationis10%todealwithwastechrometanning,thedosageof254mg/L,pHvalueof4.07whentheremovalrateofCODcrcanreach19.95%,chromiumbeforeandafterflocculationwere10.334g/l,9.260g/l.Theuseoffiltrationmed
5、iatogelasafilterwhentheremovalrateofCODcrcanreach44.50%,thechromiumcontentbeforeandafterfiltrationwere10.334g/l,9.145g/l.Toactivatedcarbon(coarseandfine)forthemedia,theremovalrateofCODcrcanreach59.29%,respectively,59.02%,thechromiumcontentbeforeandafterfiltrationwere10.334g/l,9.336g/land10.334g/l,
6、9.145g/l.WhenthesandforthefiltermaterialwhentheremovalrateofCODcrfor4.88%,chromiumconcentrationbeforeandafterfiltrationwere10.334g/l,9.145g/l.Bycomparison,formtheeconomyandpracticability,andotherconsiderations,thatchrometanningwastewaterflocculationisthebestrecyclingprograms.Keywords:Chrometanning
7、waste;PAC;Adsorbent;RecyclingII目录1绪论11.1我国皮革产业现状11.2浙江皮革产业现状21.3毛皮加工铬鞣工序及废水特征21.3.1铬鞣的作用21.3.2铬鞣使用的化工材料31.3.3铬鞣产生的废水性质及废水量31.4相关研究的最新成果及动态41.4.1直接循环利用法41.4.2聚脂PS药剂法41.4.3加碱沉淀法41.4.4离子交换法51.4.5萃取回收法51.5研究内容及意义51.5