Enhancement of activated sludge dewatering performance with combined peroxyacetic acid oxiution and chemical re-flocculation with inorganic coagulants

被引：0
|
作者：
Cao B. [1 ]
Zhang W. [2 ]
Wang D. [3 ]
Duan J. [1 ]
机构：
[1] School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, Xi'an
[2] School of Environmental Studies, China University of Geosciences (Wuhan), Wuhan
[3] State Key Laboratory of Environmental Aquatic Chemistry, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing
来源：
Zhang, Weijun (zhwj_1986@126.com) | 2016年 / Harbin Institute of Technology卷 / 48期
关键词：
Activated sludge; Chemical coagulation; Dewaterability; EPS; Oxiution; PAA;
D O I：
10.11918/j.issn.0367-6234.2016.02.017
中图分类号：
学科分类号：
摘要：
Extracellular polymeric substances (EPS) in sewage sludge are highly hydrophilic, and the destruction of EPS structure is very essential for the high-performance dewatering process. In this study, the peracetic acid lysis and chemical re-flocculation was used to achieve the volume reduction and dewaterability improvement of waste activated sludge. Moreover, dynamic variations of the floc morphology and EPS properties of sludge were also investigated. The results indicated that PAA treatment had very limited effect on sludge filterability, while filtration drying performance was effectively improved. PAA could effectively solubilize the sludge particle and destroy the protein-like substances, resulting in an efficient releasing of bound water. Sludge dewatering was enhanced under a low pH level after PAA oxiution, ascribing to the higher oxiutive ability of PAA under acid conditions. No integral sludge floc could be observed after PAA treatment at high dosages. Floc reformed after the additive of PAC and ferric chloride, meanwhile both filterability and dewaterability were improved. Furthermore, PAC performed better in improving sludge dewatering performance than ferric chloride due to its high adsorption and bridging abilities. © 2016, Harbin Institute of Technology. All right reserved.
引用
收藏
页码：100 / 108
页数：8
相关论文
共 21 条
  • [1] Vaxelaire J., Cezac P., Moisture distribution in activated sludges: a review, Water Research, 38, pp. 2215-2230, (2004)
  • [2] Liu Y., Fang H.H., Influences of extracellular polymeric substances (EPS) on flocculation, settling, and dewatering of activated sludge, Crit Rev Environ Sci Technol, 33, pp. 237-273, (2003)
  • [3] Mikkelsen L.H., Keiding K., Physico-chemical characteristics of full scale sewage sludges with implications to dewatering, Water Research, 36, pp. 2451-2462, (2002)
  • [4] Niu M., Zhang W., Wang D., Et al., Correlation of physicochemical properties and sludge dewaterability under chemical conditioning using inorganic coagulants, Bioresource Technology, 144, pp. 337-343, (2013)
  • [5] Zhang W., Xiao P., Liu Y., Et al., Understanding the impact of chemical conditioning with inorganic polymer flocculants on soluble extracellular polymeric substances in relation to the sludge dewaterability, Separation and Purification Technology, 132, pp. 430-437, (2014)
  • [6] Neyens E., Baeyens J., Dewil R., Advanced sludge treatment affects extracellular polymeric substances to improve activated sludge dewatering, Journal of Hazardous Materials, 106, pp. 83-92, (2004)
  • [7] Su F., Xing X., Sun X., Reduction of excess sludge by peracetic acid, Journal of Chemical Engineering of Chinese Universities, 18, pp. 471-476, (2004)
  • [8] Sun D., Guo S., Ma N., Et al., Pretreatment of excess sludge by microwave combined with peracetic acid, Environmental Pollution and Control, 33, pp. 50-53, (2011)
  • [9] Zhang H., Lei M., Li Y., Et al., Extraction of extracellular polymeric substances from activated sludge in membrane bioreactor, Journal of Chemical Industry and Engineering (China), 59, pp. 1531-1534, (2008)
  • [10] Frolund B., Palmgren R., Keiding K., Et al., Extraction of extracellular polymers from activated sludge using a cation exchange resin, Water Research, 30, pp. 1749-1758, (1996)
123