β-环糊精在活性污泥调理中的应用
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摘要
以东北某城市污水处理厂产生的剩余活性污泥为研究对象,采用β-环糊精(β-CD)作为化学调理剂对污泥进行调理,以改善污泥的脱水性能。以污泥比阻(SRF)为主要指标考察了投药量、pH值和搅拌强度对污泥过滤脱水性能的影响,并比较了β-CD和聚丙烯酰胺(PAM)两种调理剂的调理效果。实验结果表明:β-CD在温度为25℃,pH为7,混合阶段以150 r/min的速度快速搅拌1 min,反应阶段以50 r/min的速度慢速搅拌5 min,投加量为30.66 mg/g·干污泥时,对活性污泥的调理效果最佳,污泥比阻由5.92×10~(13)降至0.53×10~(13) m/kg。相同调理条件下,PAM或β-CD的投加量均为其各自的最佳投加量时,PAM的调理效果略优于β-CD。
The excess activated sludge of Northeast sewage treatment plant was taken as the research object.β-cyclodextrin(β-CD)was used as chemical conditioner to improve dewatering performance of sludge.The effects of dosage of conditioners,the initial pH of sludge and stirring intensity have been investigated depending on the specific resistance to filtration(SRF)of sludge.The dewaterability of activated sludge conditioned by PAM and β-CD were also compared.The results show that the optimal parameters of β-CD were that the reaction temperature was 25 ℃,the sludge initial pH was 7,rapid stirring time was 1 min with 160 r/min at mixing stage,slow stirring time was 5 min with 50 r/min at reaction stage,the dosage was 30.66 mg/g·dry sludge.The SRF of sludge decreased from 5.92×10~(13) m/kg to 0.53×10~(13) m/kg.Under the same parameters,the dewaterability of activated sludge is better by PAM than β-CD.
The excess activated sludge of Northeast sewage treatment plant was taken as the research object.β-cyclodextrin(β-CD)was used as chemical conditioner to improve dewatering performance of sludge.The effects of dosage of conditioners,the initial pH of sludge and stirring intensity have been investigated depending on the specific resistance to filtration(SRF)of sludge.The dewaterability of activated sludge conditioned by PAM and β-CD were also compared.The results show that the optimal parameters of β-CD were that the reaction temperature was 25 ℃,the sludge initial pH was 7,rapid stirring time was 1 min with 160 r/min at mixing stage,slow stirring time was 5 min with 50 r/min at reaction stage,the dosage was 30.66 mg/g·dry sludge.The SRF of sludge decreased from 5.92×10~(13) m/kg to 0.53×10~(13) m/kg.Under the same parameters,the dewaterability of activated sludge is better by PAM than β-CD.
引文
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[28]LIU H,YANG J K,SHI Y F,et al.Conditioning of sewage sludge by Fenton's reagent combined with skeleton builders[J].Chemosphere,2012,88(2):235-239.
[2]WANG W,LUO Y X,QIAO W.Possible solutions for sludge dewatering in China[J].Frontiers of Environmental Science & Engineering in China,2010,4(1):102-107.
[3]WAKEMAN R J.Separation technologies for sludge dewatering[J].Journal of Hazardous Materials,2007,144(3):614-619.
[4]TONY M A,ZHAO Y Q,TAYEB A M.Exploitation of Fenton and Fenton-like reagents as alternative conditioners for alum sludge conditioning[J].Journal of Environmental Sciences,2009,21(1):101-105.
[5]于晓,李衍博,张文哲,等.化学调理法改善污泥脱水的研究进展[J].工业水处理,2018,38(11):1-6.
[6]严伟嘉,孙永军,冯丽颖,等.污泥调理技术研究进展[J].土木建筑与环境,2015,37(增):41-45.
[7]蒋波傅,佳骏,蔡伟民.污泥化学调理研究现状[J].上海化工,2007,32(1):4-7.
[8]陈今朝,黄广英.多糖类天然高分子絮凝剂在污泥处理中的应用[J].中国资源综合利用,2016,34(6):35-38.
[9]GODOS I,GUZMAN H O,SOTO P A,et al.Coagulation/flocculation-based removal of algal-bacterial biomass from piggery wastewater treatment[J].Bioresource Technology,2011,102:923-927.
[10]PENDASHTEH A R,FAKHRU’L-RAZI A,MADAENI S S,et al.Membrane foulants characterization in a membrane bioreactor(MBR)treating hypersaline oily wastewater[J].Chemical Engineering Journal,2011,168:140-150.
[11]顿咪娜,胡文容,裴海燕,等.壳聚糖在活性污泥和消化污泥调理中的应用[J].武汉理工大学学报,2009,31(6):86-91.
[12]周国强,欧阳仡欣,郭宏伟,等.污泥调理对其脱水性能的实验研究[J].环境工程,2015,33(增):570-573.
[13]LUO H J,NING X A,LIANG X J,et al.Effects of sawdust-CPAM on textile dyeing sludge dewaterability and filter cake properties[J].Bioresouce Technology,2013,139:330-336.
[14]金建华,苗兆静.污泥脱水中PAC与PAM联合使用的试验研究[J].江苏环境科技,2006,19(2):4-6.
[15]GLOVER S M,YAN Y D,JAMESON G J,et al.Dewatering properties of dual-polymer-flocculated systems[J].International Journal of Mineral Processing,2004,73:145-160.
[16]叶何兰,叶锦韶,钟子嘉,等.微生物絮凝剂的污泥脱水性能研究[J].环境化学,2009,28(3):414-417.
[17]杨阿明,张志强,王学江,等.高效微生物絮凝剂用于污泥脱水及其动力学研究[J].中国给水排水,2007,23(9):24-27.
[18]BOLTO B,GREGORY J.Organic polyelectrolytes in water treatment[J].Water Research,2007,41:2301-2324.
[19]CHOI C W,YOO S,OH I,et al.Characterization of an extracellular flocculating substance produced by a planktonic cyanobacterium Anabaena sp.[J].Biotechnology Letters,1998,20(7):643-646.
[20]梁海燕,李姝静,周威.环糊精包结作用下水溶液共聚合制备疏水改性阳离子聚丙烯酰胺及其絮凝效果研究[J].高分子通报,2013(6):44-50.
[21]郑建斌,陶福芳,张宏芳.β-环糊精的示波行为及其应用[J].西北大学学报,2005,35(6):727-730,740.
[22]谢德明,孙尉翔.环糊精-高聚物超分子类生物材料的研究进展[J].材料科学与工程学报,2006,24(4):623-626.
[23]BRADLEY H H,MALYUBA A,TUAN L,et al.Sludge dewatering with cyclodextrins[J].Water Research,2007,41:1201-1206.
[24]李海丰,王光辉,于荣.环糊精在环境治理中的应用研究进展[J].环境污染与防治,2007,29(1):844-853.
[25]郑瑛,项生昌,柯培玲.β-环糊精交联聚合物的合成及其在水处理中的应用[J].合成化学,2001,9(6):514-517.
[26]吴纯德,范瑾初.环糊精在水处理中的研究及应用[J].水处理技术,1998,24(3):167-170.
[27]万耀强.城市污水处理厂污泥过滤脱水性能的试验研究[D].郑州:郑州大学,2007.
[28]LIU H,YANG J K,SHI Y F,et al.Conditioning of sewage sludge by Fenton's reagent combined with skeleton builders[J].Chemosphere,2012,88(2):235-239.
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