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Membrane Water Treatment
  Volume 8, Number 6, November 2017 , pages 529-541
DOI: https://doi.org/10.12989/mwt.2017.8.6.529
 


Multi- effect air gap membrane distillation process for pesticide wastewater treatment
Bhausaheb L. Pangarkar, Samir K. Deshmukh and Prashant V. Thorat

 
Abstract
    A multi-effect air gap membrane distillation (ME-AGMD) module for pesticide wastewater treatment is studied with internal heat recovery, sensible heat of brine recovery, number of stages and the use of fresh feed as cooling water in a single module is implemented in this study. A flat sheet polytetrafluroethylene (PTFE) membrane was used in the 4-stage ME-AGMD module. The maximum value of permeate flux could reach 38.62 L/m2h at feed -coolant water temperature difference about 52\'C. The performance parameter of the module like, specific energy consumption and gain output ratio (GOR) was investigated for the module with and without heat recovery. Also, the module performance was characterized with respect to the separation efficiency of several important water quality parameters. The removal efficiency of the module was found to be >98.8% irrespective water quality parameters. During the experiment the membrane fouling was caused due to the deposition of the salt/crystal on the membrane surface. The membrane fouling was controlled by membrane module washing cycle 9 h and also by acidification of the feed water (pH=4) using 0.1M HCl solution.
 
Key Words
    membrane distillation; multi-effect air gap membrane distillation; wastewater treatment; pesticide wastewater
 
Address
Bhausaheb L. Pangarkar : Chemical Engineering Department, Sir Visvesvaraya Institute of Technology, Chincholi, Nashik,
(Affiliated to SavitribaiPhule Pune University, Pune), 422 102, India/
Chemical Engineering Department, College of Engineering and Technology, Akola
(Affiliated to the SantGadge Baba Amravati University, Amravati), 444 104, India
Samir K. Deshmukh : Chemical Engineering Department, Priyadarshini Institute of Engineering and Technology, Nagpur, 440 019,India
Prashant V. Thorat : Chemical Engineering Department, College of Engineering and Technology, Akola
(Affiliated to the SantGadge Baba Amravati University, Amravati), 444 104, India
 

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