Nanofiltration based water reclamation from tannery effluent following coagulation pretreatment

被引:44
作者
Dasgupta, J. [1 ]
Mondal, D. [1 ]
Chakraborty, S. [2 ]
Sikder, J. [1 ]
Curcio, S. [2 ]
Arafat, H. A. [3 ]
机构
[1] Natl Inst Technol Durgapur, Dept Chem Engn, Durgapur 713209, W Bengal, India
[2] Univ Calabria, Dept Informat Modeling Elect & Syst Engn, I-87036 Arcavacata Di Rende, CS, Italy
[3] Masdar Inst Sci & Technol, Dept Chem & Environm Engn, Inst Ctr Water & Environm iWater, Abu Dhabi, U Arab Emirates
关键词
Chromium(VI) removal; Tannery wastewater; Response surface optimization; Nanofiltration; Water reclamation; HEXAVALENT CHROMIUM REMOVAL; HEAVY-METAL IONS; WASTE-WATER; AQUEOUS-SOLUTIONS; FLOCCULATION PROCESS; VI REMOVAL; OPTIMIZATION; PERFORMANCE; SEPARATION; MEMBRANES;
D O I
10.1016/j.ecoenv.2015.07.006
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Coagulation-nanofiltration based integrated treatment scheme was employed in the present study to maximize the removal of toxic Cr(VI) species from tannery effluents. The coagulation pretreatment step using aluminium sulphate hexadecahydrate (alum) was optimized by response surface methodology (RSM). A nanofiltration unit was integrated with this coagulation pre-treatment unit and the resulting flux decline and permeate quality were investigated. Herein, the coagulation was conducted under response surface-optimized operating conditions. The hybrid process demonstrated high chromium(VI) removal efficiency over 98%. Besides, fouling of two of the tested nanofiltration membranes (NF1 and NF3) was relatively mitigated after feed pretreatment. Nanofiltration permeation fluxes as high as 80-100 L/m(2) h were thereby obtained. The resulting permeate stream quality post nanofiltration (NF3) was found to be suitable for effective reuse in tanneries, keeping the Cr(VI) concentration (0.13 mg/L), Biochemical Oxygen Demand (BOD) (65 mg/L), Chemical Oxygen Demand (COD) (142 mg/L), Total Dissolved Solids (TDS) (108 mg/L), Total Solids (TS) (86 mg/L) and conductivity levels (14 mho/cm) in perspective. The process water reclaiming ability of nanofiltration was thereby substantiated and the effectiveness of the proposed hybrid system was thus affirmed. (C) 2015 Elsevier Inc. All rights reserved.
引用
收藏
页码:22 / 30
页数:9
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