高压脉冲电解-压滤联合实现城市污泥深度脱水
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摘要
设计了一种新型的聚丙烯/不锈钢绝缘复合电极及装置,采用高压脉冲电解-压滤联合处理城市污水厂离心污泥深度脱水,考察了脉冲电场强度、机械压力和处理时间对污泥脱水性能指标-比阻(SRF)和滤饼含水率的影响,并测定处理前后滤液中COD、胞外聚合物(EPS)和重金属离子的含量。结果表明:以7. 5 k V/cm电场强度,50 k Pa机械压力联合处理污泥15 min,污泥比阻由10. 8×10~(12)m/kg降低至4. 47×10~(12)m/kg,泥饼含水率由85. 60%降低至57. 83%;污泥滤出液蛋白质、多糖、SCOD浓度增大为原来的290. 2%、350. 1%、1070. 4%。高压脉冲电解-压滤法可有效破解污泥EPS并降低污泥含水率。
A new combinative technology of pulse electric field( PEF) electrolysis-filter pressing was designed for deep dewatering of municipal sludge. The novel system was composed of polypropylene/stainless steel insulation composite electrodes and devices. In the study,the effects of pulsed electric field intensity,mechanical pressure and treatment time on the performance index of sludge dewatering( specific resistance to filtration( SRF)) and the water content of filter cake were studied. In addition,the content of COD,extracellular polymeric substances( EPS) and heavy metal ions in filtrate before and after treatment were also measured. The results showed that,under the combinative treatment of 7. 5 k V/cm( electrical field intensity),50 k Pa( mechanical pressure) for 15 min,the SRF of the sludge decreased from 10. 8×10~(12) m/kg to 4. 47×10~(12) m/kg,and the water content of the mud cake decreased from 85. 60% to 57. 83%. And the concentration of protein,polysaccharide and SCOD in sludge filtration increased to 290. 2%,350. 1% and 1070. 4% of the original concentration respectively. The PEF-filter pressing can effectively break EPS and reduce the water content of the sludge.
A new combinative technology of pulse electric field( PEF) electrolysis-filter pressing was designed for deep dewatering of municipal sludge. The novel system was composed of polypropylene/stainless steel insulation composite electrodes and devices. In the study,the effects of pulsed electric field intensity,mechanical pressure and treatment time on the performance index of sludge dewatering( specific resistance to filtration( SRF)) and the water content of filter cake were studied. In addition,the content of COD,extracellular polymeric substances( EPS) and heavy metal ions in filtrate before and after treatment were also measured. The results showed that,under the combinative treatment of 7. 5 k V/cm( electrical field intensity),50 k Pa( mechanical pressure) for 15 min,the SRF of the sludge decreased from 10. 8×10~(12) m/kg to 4. 47×10~(12) m/kg,and the water content of the mud cake decreased from 85. 60% to 57. 83%. And the concentration of protein,polysaccharide and SCOD in sludge filtration increased to 290. 2%,350. 1% and 1070. 4% of the original concentration respectively. The PEF-filter pressing can effectively break EPS and reduce the water content of the sludge.
引文
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[2] Mohammadi A R,Mehrdadi N,Bidhendi G N,et al. Excess sludge reduction using ultrasonic waves in biological wastewater treatment[J]. Desalination,2011,275(1):67-73.
[3] Zhan T L,Zhan X J,Lin W A,et al. Field and laboratory investigation on geotechnical properties of sewage sludge disposed in a pit at Changan landfill,Chengdu,China[J]. Engineering Geology,2014,170(4):24-32.
[4]李辉,吴晓芙,蒋龙波,等.城市污泥脱水干化技术进展[J].环境工程,2014,32(11):102-107.
[5]王硕,陈晓光,陈宇,等.城市污水处理厂污泥深度脱水技术研究进展[J].环境科学与技术,2015,38(增刊2):186-190.
[6]梁波,陈海琴,关杰.超声波预处理城市剩余污泥脱水性能研究进展[J].工业用水与废水,2017,48(4):1-6.
[7]谭林立,许航,刘珊,等.真空电渗给水污泥脱水机理的研究[J].环境科技,2017,30(1):1-4.
[8]蔡佳骏,王晓霞,孙贤波,等.超声波参数对剩余污泥中SCFAs和EHCs释放的影响[J].环境工程,2016,34(1):86-90.
[9] Lee J K,Shin H S,Park C J,et al. Performance evaluation of electrodewatering system for sewage sludges[J]. Korean Journal of Chemical Engineering,2002,19(1):41-45.
[10]翟君.污泥的弱超声电渗透脱水技术的研究[D].天津:天津大学,2014.
[11]赵武奇,殷涌光,王忠东.高压脉冲电场杀菌技术研究现状及发展[J].农业工程学报,2001,17(5):139-141.
[12]王满生,曾新安.欧姆加热杀菌与脉冲电场杀菌比较分析[J].中国农业科技导报,2015,17(5):49-54.
[13]中国国家环境保护总局.城市污水处理厂污泥检测方法:重量法CJ/T 221—2005[S].北京:中国环境科学出版社,2005.
[14]中国国家环境保护总局.化学需氧量测定:重铬酸盐法GB 11914—89[S].北京:中国环境科学出版社,1989.
[15]黄廷林,聂小保,张刚.水厂生产废水污泥比阻测定的影响因素分析及方法改进[J].西安建筑科技大学学报(自然科学版),2005,37(3):297-300.
[16]王佩芬,池源,王丽波,等.蒽酮-硫酸比色法测定南瓜籽多糖含量[J].食品研究与开发,2014(24):121-125.
[17]裴显庆.用考马斯亮蓝染色方法测定蛋白质含量[J].肉类研究,1990(1):36-37.
[18]冯国红,马赫,李云涛,等.城市污泥脱水特性的试验研究[J].能源环境保护,2018,32(1):20-23.
[19] Zhang Q,Qin B L,Barbosa-Cánovas G V,et al. Inactivation of Escherichia coli for food pasteurization by high-strength pulsed electric fields[J]. Journal of Food Processing&Preservation,1995,19(2):103-118.
[20]唐海,沙俊鹏,欧阳龙,等. Fe(Ⅱ)活化过硫酸盐氧化破解剩余污泥[J].化工学报,2015,66(2):785-792.
[21] Yang M,Hu X,Ning P,et al. Research progress in extracellular polymeric substances applied to biological wastewater treatment[J].Industrial Water Treatment,2011(7):7-12.