Fe~(2+)活化过硫酸盐对市政污泥EPS性能的影响
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摘要
针对污泥难以脱水、处理难度大的问题,通过过硫酸盐高级氧化技术联合造纸污泥作为骨架对市政污泥进行调理,以泥饼含水率、污泥比阻(SRF)、毛细吸水时间(CST)、胞外聚合物(EPS)中蛋白质和多糖的分布关系,以及滤饼和滤液中总氮、总磷含量为指标,研究Fe~(2+)活化过硫酸盐联合造纸污泥骨架构建体对EPS的影响。结果表明:将造纸污泥与市政污泥1∶2混合,再添加过硫酸盐和Fe~(2+),对污泥的调理效果最好,泥饼的含水率由74.52%降至69.57%,SRF降低了66.23%;蛋白质和多糖的分布关系为S-EPS>LB-EPS>TB-EPS,滤饼中总氮所占比例由94.60%下降至65.62%,EPS被有效破解,污泥脱水效果显著改善。
In response to the difficulty in sewage sludge dewatering and treatment, the combination of Fe~(2+)-activated persulfate oxidation and skeleton builders of paper sludge was used to condition the sewage sludge. In this study, moisture content of sludge cake, specific resistance to filtration(SRF), capillary sunction time(CST),the distribution of protein and polysaccharide in the EPS, and the total nitrogen and total phosphorus content in the filter cake and filtrate were used to evaluate the effect of above combination on the EPS. The result showed that when the sewage sludge was mixed with the paper sludge with a ratio of 1:2, the addition of Fe~(2+) and persulfate could result in the best dewaterability effect. The moisture content of sludge cake decreased from74.52% to 69.57%, and the SRF was reduced by 66.23%. The distribution of protein and polysaccharide was S-EPS>LB-EPS>TB-EPS, and the proportion of total nitrogen in cake decreased from 94.60% to 65.62%. The EPS was effectively disrupted, and the sludge dewaterability was significantly improved.
In response to the difficulty in sewage sludge dewatering and treatment, the combination of Fe~(2+)-activated persulfate oxidation and skeleton builders of paper sludge was used to condition the sewage sludge. In this study, moisture content of sludge cake, specific resistance to filtration(SRF), capillary sunction time(CST),the distribution of protein and polysaccharide in the EPS, and the total nitrogen and total phosphorus content in the filter cake and filtrate were used to evaluate the effect of above combination on the EPS. The result showed that when the sewage sludge was mixed with the paper sludge with a ratio of 1:2, the addition of Fe~(2+) and persulfate could result in the best dewaterability effect. The moisture content of sludge cake decreased from74.52% to 69.57%, and the SRF was reduced by 66.23%. The distribution of protein and polysaccharide was S-EPS>LB-EPS>TB-EPS, and the proportion of total nitrogen in cake decreased from 94.60% to 65.62%. The EPS was effectively disrupted, and the sludge dewaterability was significantly improved.
引文
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[3]高廷耀,顾国维,周琪.水污染控制[M].北京:高等教育出版社,2015.
[4]MARIE C,ZHANG Y R,YANG J K.Extracellular polymeric substances and sludge solid/liquid separation under Moringa oleifera and chitosan conditioning:A review[J].Environmental Technology Reviews,2017,6(1):59-73.
[5]毛杰,林珩,郑柏存,等.造纸污泥表面改性的研究[J].中国造纸,2017,36(1):31-35.
[6]SUN W Q,TANG M D,SUN Y J,et al.Effective sludge dewatering technique using the combination of Fenton’s reagent and CPAM[J].Canadian Journal of Chemical Engineering,2018,96(6):1256-1263.
[7]邵永,肖蕾,吴云霞,等.过硫酸钠降解印染有机废水的研究进展[J].应用化工,2017,46(1):180-183.
[8]宋秀兰,石杰,吴丽雅.过硫酸盐氧化法对污泥脱水性能的影响[J].环境工程学报,2015,9(11):5585-5590.
[9]ZHEN G Y,LU X Q,ZHAO Y C,et al.Enhanced dewaterability of sewage sludge in the presence of Fe(II)-activated persulfate oxidation[J].Bioresource Technology,2012,116:259-265.
[10]MA W C,ZHAO L,LIU H L,et al.Improvement of sludge dewaterability with modified cinder via affecting EPS[J].Frontiersof Environmental Science and Engineering,2017,11(6):19-32.
[11]-徐文迪,常沙,明铁山,等.基于硫酸根自由基(SO4·)的污泥预处理技术[J].环境工程学报,2018,12(5):1528-1535.
[12]LI X Y,YANG S F.Influence of loosely bound extracellular polymeric substances(EPS)on the flocculation,sedimentation and dewaterability of activated sludge[J].Water Research,2007,41(5):1022-1030.
[13]赵璐,何婷,丁文欢,等.考马斯亮兰法(Bradford法)测定驼乳中蛋白质的含量[J].应用化工,2016,45(12):2366-2368.
[14]GHOLIKANDI G B,ZAKIZADEH N,MASIHI H.Application of peroxymonosulfate-ozone advanced oxidation process for simultaneous waste-activated sludge stabilization and dewatering purposes:A comparative study[J].Journal of Environmental Mangement,2018,206:523-531.
[15]孟维,汪苹,唐文涛.反硝化聚磷菌在低碳源城市污水脱氮除磷处理中的应用[J].环境科学与技术,2016,39(7):91-95.
[16]吴彦.稻壳基骨架颗粒制备及调理城市污泥脱水作用和机理分析[D].长沙:湖南大学,2016.
[17]LU M C,LIN C J,LIAO C H,et al.Dewatering of activated sludge by Fenton’s reagent[J].Advances in Environmental Research,2003,7(3):667-670.
[18]张昊.基于新型骨架构建体与高级氧化剂的污泥复合调理及脱水研究[D].武汉:华中科技大学,2014.
[19]阚丹,孙静娴,张雯,等.混价铁氢氧化物对无机磷的吸附/沉淀[J].土壤,2012,44(3):520-524.