Influence of Filter Cloth on the Cathode on the Electroosmotic Dewatering of Activated Sludge

Abstract

Abstract: The mechanical dewatering of activated sludge is troublesome due to its high compressibility of solids. The dewatering can be enhanced dramatically by the use of electroosmosis,in which an electric field is applied to the sludge cake.In this study,the influence of filter cloth on the cathode on the dewatering of activated sludge was investigated.It was found that thicker filter cloth led to lower water removal from the sludge cake,so a stainless steel cathode net with small pore size instead of filter cloth was applied,which improves the dewatering efficiency and reduces the electric power consumption.Moreover,water absorbent materials were helpful to remove the water from the sludge cake.For the electroosmotic dewatering at 7 kPa and 24 V·cm^-1,the water content in the sludge cake decreased to 60% (by mass) with the average 0.075 kW·h·kg^-1 of water removed by using the cathode net.

Key words: activated sludge, eletroosmotic dewatering, filter cloth, cathode

摘要： The mechanical dewatering of activated sludge is troublesome due to its high compressibility of solids. The dewatering can be enhanced dramatically by the use of electroosmosis,in which an electric field is applied to the sludge cake.In this study,the influence of filter cloth on the cathode on the dewatering of activated sludge was investigated.It was found that thicker filter cloth led to lower water removal from the sludge cake,so a stainless steel cathode net with small pore size instead of filter cloth was applied,which improves the dewatering efficiency and reduces the electric power consumption.Moreover,water absorbent materials were helpful to remove the water from the sludge cake.For the electroosmotic dewatering at 7 kPa and 24 V·cm^-1,the water content in the sludge cake decreased to 60% (by mass) with the average 0.075 kW·h·kg^-1 of water removed by using the cathode net.

关键词: activated sludge, eletroosmotic dewatering, filter cloth, cathode

YU Xiaoyan, ZHANG Shuting, XU Hui, ZHENG Lei, L黊uebin, MA Degang. Influence of Filter Cloth on the Cathode on the Electroosmotic Dewatering of Activated Sludge[J]. , 2010, 18(4): 562-568.

于晓艳, 张书廷, 徐辉, 郑磊, 吕学斌, 马德刚. Influence of Filter Cloth on the Cathode on the Electroosmotic Dewatering of Activated Sludge[J]. , 2010, 18(4): 562-568.

References

1 Lo,I. M. C.,Lai,K .C. K.,Chen,G.H.,“Salinity effect on mechanical dewatering of sludge with and without chemical conditioning”,En-viron.Sci.Technol.,35 (23),4691-4696 (2001).
2 Mihoubi,D.,“Mechanical and thermal dewatering of residual sludge”,Desalination,167(15),135-139 (2004).
3 Deng,W. Y.,Yan,J.H.,Li,X. D.,Wang,F.,Zhu,X.W.,Lu,S. Y.,Cen, K. F.,“Emission characteristics of volatile compounds during sludges drying proces”,J.Hazard.Mater.,162(1),186-192(2009).
4 Yoshida,H.,Shinkawa,T.,Yukawa,H.,“Water content and electric potential distributions in gelatinous bentonite sludge with electroosmo-tic dewatering”,J.Chem.Eng.Japan,18(4),337-342 (1985).
5 Yoshida,H.,“Practical aspects of dewatering enhanced by elec-tro-osmosis”,Drying Technol.,11(4),787-814 (1993).
6 Chen,G.H.,Mujumdar,A.S.,“Application of electrical fields in de-watering and drying”,Dev.Chem.Eng.Mineral Process.,10(3/4), 429-441(2002).
7 Alasheh,S.,Jumah,R.,Banat,F.,Alzoubi,K.,“Direct current elec-troosmosis dewatering of tomato paste suspension”,Food Bioprod. Process.,82 (C3),193-200(2004).
8 Weber,K.,Stahl,W.,“Improvement of filtration kinetics by pressure electrofiltration”,Sep.Purif.Technol.,26(1),69-80(2002).
9 Curvers,D.,Maes,K.C.,Saveyn,H.,De Baets,B.,Miller,S.,van der Meeren,P.,“Modelling the electro-osmotically enhanced pres-sure dewatering of activated sludge”,Chem.Eng.Technol.,62(8), 2267-2276(2007).
10 Larue,O.,Wakeman,R.J.,Tarleton,E.S.,Vorobiev,E.,“Pressure electroosmotic dewatering with continuous removal of electrolysis products”,Chem.Eng.Sci.,61(14),4732-4740(2006).
11 Hwang,S.C.,Min,K.S.,“Improved sludge dewatering by addition of electro-osmosis to belt filter press”,J.Environ.Eng.Sci.,2(2), 149-153(2003).
12 Kondoh,S.,Hiraoka,M.,“Commercialization of pressurized elec-tro-osmotic dehydrator(PED)”,Water Sci.Technol.,22(12), 259-268(1990).
13 Lee,J.E.,Lee,J.K.,Choi,H.K.,“Filter press for electrodewatering of waterworks sludge”,Drying Technol.,25(12),1985>-1993(2007).
14 APHA,Standard Methods for the Examination of Water and Waste-water,American Public Health Association,Baltimore(1995).
15 Ma,D. G.,Zhang,S.T.,Ji,M.,Liu,L.L.,“Optimization of operating condition for sewage sludge dewatering by electro-osmosis technol-ogy”,China Water&Wastewater,21(5),36-38(2005).(in Chinese)
16 Yukawa,H.,Chigira,H.,Hoshino,T.,Iwata,M.,“Fundamental study of electroosmotic filtration”,J.Chem.Eng.Jpn.,4(4),370-376 (1971).
17 Reddy,K.R.,Urbanek,A.,Khodadoust,A.P.,“Electroosmotic dewa-tering of dredged sediments:Bench-scale investigation”,J.Environ. Manage.,78(2),200-208(2006).
18 Zhou,J. X.,Liu,Z.,She,P.,Ding,F. X.,“Water removal from sludge in a horizontal electric field”,Drying Technol.,19(3/4),627-638 (2001).
19 Hong,J.L.,Hong,J.M.,Otaki,M.,Jolliet,O.,“Environmental and economic life cycle assessment for sewage sludge treatment proc-esses in Japan”,Waste Manage.,29(2),696-703(2009).
20 Zhang,B. G.,Li,L.,Zhang,Z. T.,Zong,Y. B.,Fang,Y.F.,“Experi-mental study on sludge drying rate and energy consumption”,Dry-ing Technology&Equipment,5(5),220-224(2007).(in Chinese)

[1]	Runze Chen, Yuran Chen, Xuemin Liang, Yapeng Kong, Yangyang Fan, Quan Liu, Zhenyu Yang, Feiying Tang, Johnny Muya Chabu, Maru Dessie Walle, Liqiang Wang. Oxidative exfoliation of spent cathode carbon: A two-in-one strategy for its decontamination and high-valued application [J]. Chinese Journal of Chemical Engineering, 2023, 59(7): 262-269.
[2]	Yunke Wang, Yongjia Li, Yenan Zhang, Guozheng Zha, Feng Liang, Yongnian Dai, Yaochun Yao. Influence of synergistic effect of LiNi_0.8Co_0.15Al_0.05O₂@Cr₂O₅ composite on the electrochemical properties [J]. Chinese Journal of Chemical Engineering, 2021, 33(5): 327-336.
[3]	Xiaodong Tang, Qiankun Guo, Miaomiao Zhou, Shengwen Zhong. Direct regeneration of LiNi_0.5Co_0.2Mn_0.3O₂ cathode material from spent lithium-ion batteries [J]. Chinese Journal of Chemical Engineering, 2021, 40(12): 278-286.
[4]	Chengyi Ai, Tingting Li, Rongzheng Ren, Zhenhua Wang, Wang Sun, Jinsheng Feng, Kening Sun, Jinshuo Qiao. Barium-doped Pr₂Ni_0.6Cu_0.4O_4+δ with triple conducting characteristics as cathode for intermediate temperature proton conducting solid oxide fuel cell [J]. Chinese Journal of Chemical Engineering, 2021, 39(11): 269-276.
[5]	Haifeng Yu, Zhaofeng Yang, Huawei Zhu, Hao Jiang, Chunzhong Li. Nitrogen-doped carbon stabilized LiFe_0.5Mn_0.5PO₄/rGO cathode materials for high-power Li-ion batteries [J]. Chinese Journal of Chemical Engineering, 2020, 28(7): 1935-1940.
[6]	Abrar Khan, Raja Arumugam Senthil, Junqing Pan, Yanzhi Sun. A facile preparation of 3D flower-shaped Ni/Al-LDHs covered by β-Ni(OH)₂ nanoplates as superior material for high power application [J]. Chinese Journal of Chemical Engineering, 2019, 27(10): 2526-2534.
[7]	Abdellah Benzaouak, Nour-Eddine Touach, V. M. Ortiz-Martínez, M. J. Salar-García, F. Hernández-Fernández, A. P. de los Ríos, Mohammed El Mahi, El Mostapha Lotfi. Ferroelectric solid solution Li_1-xTa_1-xW_xO₃ as potential photocatalysts in microbial fuel cells: Effect of the W content [J]. Chin.J.Chem.Eng., 2018, 26(9): 1985-1991.
[8]	Kiros Hagos, Chang Liu, Xiaohua Lu. Effect of endogenous hydrogen utilization on improved methane production in an integrated microbial electrolysis cell and anaerobic digestion: Employing catalyzed stainless steel mesh cathode [J]. Chin.J.Chem.Eng., 2018, 26(3): 574-582.
[9]	Alexandros D. Kotzapetros, Panayotis A. Paraskevas, Athanasios S. Stasinakis. Design of a modern automatic control system for the activated sludge process in wastewater treatment [J]. Chin.J.Chem.Eng., 2015, 23(8): 1340-1349.
[10]	Qin Lu, Haiyan Wu, Haoyan Li, Dianhai Yang. Enhanced biological nutrient removal inmodified carbon source division anaerobic anoxic oxic process with return activated sludge pre-concentration [J]. Chin.J.Chem.Eng., 2015, 23(6): 1027-1034.
[11]	Xianli Shi, Li Deng, Fangfang Sun, Jieyu Liang, Xu Deng. Key factors governing alkaline pretreatment of waste activated sludge [J]. Chin.J.Chem.Eng., 2015, 23(5): 842-846.
[12]	Yan Cui, Shengming Xu . High tap density of Ni₃(PO₄)₂ coated LiNi_1/3Co_1/3Mn_1/3O₂ with enhanced cycling performance at high cut-off voltage [J]. Chin.J.Chem.Eng., 2015, 23(1): 315-320.
[13]	ZHANG Guangming, WAN Tian, GAO Feng, DONG Shan. Impacts of Power Density on Heavy Metal Release During Ultrasonic Sludge Treatment Process [J]. Chin.J.Chem.Eng., 2014, 22(4): 469-473.
[14]	Yinguang Chen, Hui Mu, Xiong Zheng. Chronic Response of Waste Activated Sludge Fermentation to Titanium Dioxide Nanoparticles [J]. , 2014, 22(10): 1162-1167.
[15]	YANG Kedi, TAN Fangxiang, WANG Fan, LONG Yunfei, WEN Yanxuan. Response Surface Optimization for Process Parameters of LiFePO₄/C Preparation by Carbothermal Reduction Technology [J]. Chin.J.Chem.Eng., 2012, 20(4): 793-802.