title: Electrocoagulation-integrated hybrid membrane processes for the treatment of tannery wastewater.
abstract: Three different combinations of treatment techniques, i.e. electrocoagulation combined with microfiltration (EMR), membrane bioreactor (MBR) and electrocoagulation integrated with membrane bioreactor (hybrid MBR, (HMBR)), were analysed and compared for the treatment of tannery wastewater operated for 7 days under the constant trans-membrane pressure of 5 kPa. HMBR was found to be most suitable in performance as well as fouling reduction, with 94 % of chemical oxygen demand (COD) removal, 100 % chromium removal and 8 % improvement in percentage reduction in permeate flux compared to MBR with only 90 % COD removal and 67 % chromium removal. The effect of mixed liquor suspended solids on fouling was also investigated and was found to be insignificant. EMR was capable of elevating the flux but was not as efficient as HMBR and MBR in COD removal. Fouling reduction by HMBR was further confirmed by SEM-EDX and particle size analysis.
authors: Department of Chemical Engineering, A.C. Tech. Campus, Anna University, Chennai, 600025, India.
authors: Keerthi
authors: V
authors: V
authors: Vinduja
authors: N
authors: N
authors: Balasubramanian
mesh_terms: D057919:Biological Oxygen Demand Analysis; D019149:Bioreactors; D008567:Membranes, Artificial; D013633:Tanning; D014865:Waste Disposal, Fluid / Q000379:methods*; D062065:Wastewater / Q000737:chemistry*; D014874:Water Pollutants, Chemical / Q000032:analysis*; D018508:Water Purification / Q000379:methods*
chemical_list: D008567:Membranes, Artificial; D062065:Wastewater; D014874:Water Pollutants, Chemical
references: Bioresour Technol. 2008 Dec;99(18):8559-64
references: 18499451
references: Water Res. 2001 Jul;35(10):2435-45
references: 11394778
references: J Hazard Mater. 2006 Apr 17;131(1-3):73-8
references: 16243434
references: Environ Sci Technol. 2010 May 1;44(9):3298-304
references: 20355694
references: J Environ Sci Health A Tox Hazard Subst Environ Eng. 2004;39(7):1881-90
references: 15242134
references: J Environ Sci (China). 2007;19(12):1409-15
references: 18277642
references: J Environ Sci Eng. 2006 Jul;48(3):213-20
references: 17915787
references: Water Sci Technol. 2005;51(6-7):27-34
references: 16003958