高盐度化学制药废水预处理试验研究

第31卷第1期河北科技大学学报Vol.31,No.12010年2月JournalofHebeiUniversityofScienceandTechnologyFeb.2010文章编号:100821542(2010)0120052205高盐度化学制药废水预处理试验研究李再兴1,李萍1,苗志加1,杨景亮1,严伟2(1.河北科技大学环境科学与工程学院,河北石家庄050018;2.河北省农业机械化研究所有限公司,河北石家庄050051)摘要:采用“蒸馏+铁炭内电解+絮凝”工艺对某制药企业排放的废水进行预处理。经过蒸馏脱盐后,综合废水盐度(质量分数,下同)由7.4%降至0.15%;再采用“铁炭内电解+絮凝”工艺进行处理,内电解试验最佳工艺条件:进水pH值为3.0、铁炭比为4∶1(体积比)、停留时间为6h,COD去除率达到26.5%;絮凝试验最佳pH值为9.0,COD去除率达到1.5%。废水经过预处理后,COD去除率达到28.0%,出水COD质量浓度(下同)降至20988mg/L,ρ(BOD)5/ρ(COD)由0.28提高至0.41。预处理出水厌氧可生化性试验表明,当进水COD质量浓度为9000mg/L左右时,容积负荷(COD)为1.0kg/(m3·d),出水COD质量浓度降低至2100mg/L左右,COD去除率达到75.0%。说明该制药废水经过预处理后可生化性显著提高,为后续的生化处理创造了有利条件。关键词:化学制药废水;高盐度;预处理;脱盐;铁炭内电解;絮凝;可生化性中图分类号:X703文献标识码:APretreatmentofchemicalpharmaceuticalwastewaterwithhighsalinityLIZai2xing1,LIPing1,MIAOZhi2jia1,YANGJing2liang1,YANWei2(1.CollegeofEnvironmentalScienceandEngineering,HebeiUniversityofScienceandTechnology,ShijiazhuangHebei050018,China;2.HebeiResearchInstituteofAgriculturalMechanizationCompanyLimited,ShijiazhuangHebei050051,China)Abstract:Thechemicalpharmaceuticalwastewaterwaspretreatedbydistillation+ferric2carbonmicroelectrolysis+floccula2tionprocess.Theresultsindicatethatthesalinityoftheintegratedwastewaterfallsfrom7.4%to0.15%afterdistillation.Thenitwastreatedbyferric2carbonmicroelectrolysis+flocculation,andtheoptimizedconditionsofferric2carbonmicroelec2trolysisarepH=3.0,V(Fe)/V(C)=4∶1andHRT=6h.CODremovalrateis26.5%.TheoptimizedpHvalueoffloccula2tionare9.0andCODremovalrateare1.5%.Afterthesepretreatmentprocesses,CODremovalratereaches28.0%,CODisdecreasedto20988mg/L,andtheratioofBOD5/CODofwastewaterincreasedfrom0.28to0.41.Thentheeffluentofthepretreatmentprocesswastreatedbyanaerobicdigestion.TheresultsshowthatCODdecreasesfrom9000mg/Lto2100mg·L-1andCODremovalrateis75.0%,ThevolumetricCODloadingrateis1.0kg/(m3·d).Thenitcouldbeconcludedthataf2terpretreatment,thebiodegradabilityofthechemicalpharmaceuticalwastewaterisimprovedandsuitableforthefollowingbiotreatment.Keywords:chemicalpharmaceuticalwastewater;highsalinity;pretreatment;de