KMnO_4-微波联合作用的污泥破解效果
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摘要
采用KMnO_4或微波单独及联合作用预处理剩余污泥。通过对比破解前后污泥上清液中混合液挥发性悬浮固体浓度/混合液悬浮固体浓度(MLVSS/MLSS)、污泥体积指数(SVI)、污泥破解率(DD)、溶解性蛋白质含量、溶解性多糖含量、含固率等变化,考察KMnO_4或微波单独及联合作用对污泥破解以及污泥特性的影响。结果表明:KMnO_4-微波联合作用相比于单独使用KMnO_4或者微波效果更好,可以进一步提高污泥的破解率,增大有机物的溶出量,影响因素的主次顺序为微波功率、反应时间、KMnO_4投加量。采用联合作用的最佳处理条件为微波功率800 W,反应时间240 s,KMnO_4投加量2 000 mg/L,此时蛋白质和多糖在上清液中的质量浓度分别为229.46和258.47 mg/L。
The sludge disintegration and characteristics under the treatment of KMnO_4, microwave as well as their combined form were investigated by comparing the variation of mixture volatile suspension solid concentration/mixture suspension solid concentration(MLVSS/MLSS), sludge volume index(SVI), sludge disintegration degree(DD), soluble protein, soluble polysaccharide and solid containing rate before and after disintegration. Results showed that the combined treatment of and KMnO_4 and microwave could further improve the cracking rate of sludge and increase the dissolution rate of organic matter.The factors that affected the rate were in the order of microwave power, reaction time, and KMnO_4 dosage. The optimal treatment effect was obtained with the microwave power of 800 W, the reaction time of 240 s, and KMnO_4 dosage of 2 000 mg/L. The mass contents of protein and polysaccharide were 229.46 and 258.47 mg/L, respectively.
The sludge disintegration and characteristics under the treatment of KMnO_4, microwave as well as their combined form were investigated by comparing the variation of mixture volatile suspension solid concentration/mixture suspension solid concentration(MLVSS/MLSS), sludge volume index(SVI), sludge disintegration degree(DD), soluble protein, soluble polysaccharide and solid containing rate before and after disintegration. Results showed that the combined treatment of and KMnO_4 and microwave could further improve the cracking rate of sludge and increase the dissolution rate of organic matter.The factors that affected the rate were in the order of microwave power, reaction time, and KMnO_4 dosage. The optimal treatment effect was obtained with the microwave power of 800 W, the reaction time of 240 s, and KMnO_4 dosage of 2 000 mg/L. The mass contents of protein and polysaccharide were 229.46 and 258.47 mg/L, respectively.
引文
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[2] 《中国环保产业》编辑部.环境保护部发布《2014中国环境状况公报》[J].中国环保产业,2015(6):20.
[3] 孟昭辉,吴凡松,郭婉茜,等.污泥减量化水处理技术的研究现状和进展[J].中国给水排水,2013,29(8):26.
[4] KHURSHEED A,SHARMA M K,TYAJI V K,et al.Specific oxygen uptake rate gradient-aAnother possible cause of excess sludge reduction in oxic-settling-anaerobic (OSA) process[J].Chemical Engineering Journal,2015,281:613.
[5] CHANG C J,TYAJI V K,LO S L.Effects of microwave and alkali induced pretreatment on sludge solubilization and subsequent aerobic digestion[J].Bioresour Technol,2011,102(17):7633.
[6] 魏玉芹.微波-厌氧消化联合工艺处理水解酸化残余污泥的实验研究[D].广州:华南理工大学,2011.
[7] 杨国友,石林,柴妮.生石灰与微波协同作用对污泥脱水的影响[J].环境化学,2011,30(3):698.
[8] WU C,ZHANG G,ZHANG P,et al.Disintegration of excess activated sludge with potassium permanganate:feasibility,mechanisms and parameter optimization[J].Chemical Engineering Journal,2014,240(6):420.
[9] YE F,JI H,YE Y.Effect of potassium ferrate on disintegration of waste activated sludge (WAS)[J].Journal of Hazardous Materials,2012,219-220(12):164.
[10] YE F,LIU X,LI Y.Effects of potassium ferrate on extracellular polymeric substances(E)PS and physicochemical properties of excess activated sludge[J].Journal of Hazardous Materials,2012,199/200(2):158.
[11] 孙德栋,郭思晓,马妮娜,等.微波-过氧乙酸联合作用处理剩余污泥的研究[J].环境污染与防治,2011,33(4):50.
[12] BILGIN O N,AKMEHMET B I.Microwave-assisted chemical oxidation of biological waste sludge:Simultaneous micropollutant degradation and sludge solubilization[J].Bioresource Technology,2013,146(10):126.
[13] LIU J,WEI Y,LI K,et al.Microwave-acid pretreatment:a potential process for enhancing sludge dewaterability.[J].Water Research,2016,90:225.
[14] 刘昌庚,曾成华,伍斌,等.微波-高锰酸钾耦合调理城市剩余活性污泥[J].环境污染与防治,2018,4(2):123.
[15] GUAN S,DENG F,HUANG S Q,et al.Optimization of magnetic field-assisted ultrasonication for the disintegration of waste activated sludge using box-behnken design with response surface methodology[J].Ultrasonics Sonochemistry,2017,38:9.
[16] NOVAK J T,MULLER C D,MURTHY S N.Floc structure and the role of cations[J].Water Science & Technology,2001,44(10):209.
[17] WOJCIECHOWSKA E.Application of microwaves for sewage sludge conditioning[J].Water Research,2005,39(19):4749.
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