Optimization of a continuous flow electrocoagulation as pretreatment for membrane distillation of the waste stream in vinyl ester resin production

Yuan Hu, Weihan Liang, Ming Xie, Gang Chen, Ching Yoong Loh, Manhong Huang, Jinli Qiao

Research output: Contribution to journalArticlepeer-review

1 Citation (SciVal)

Abstract

Vinyl ester resin production wastewater (VERW) contains high concentrations of organics particularly, methacrylic acid and bisphenol A, which are hazardous chemicals and harmful to the aquatic environment. Therefore, there is an urgent need to properly treat the effluent before discharge into the aquatic system. In this work, direct contact membrane distillation (DCMD) was explored as an advanced treatment of the VERW pre-treated by a continuous flow electrocoagulation (EC) and peroxi-electrocoagulation (PEC) processes. Optimization of EC and PEC processes were investigated and the DCMD performance was evaluated. Results showed that the optimal value of current density and polyacrylamide (PAM) dosage was 15 mA/cm2 and 1 mg/L, respectively in the EC process. For the PEC process, the optimal addition of hydrogen peroxide (H2O2) dosage was four times of the chemical oxygen demand (COD) concentration of EC effluent. The COD of VERW was effectively removed via EC followed by PEC (EC-PEC), resulting in the significant alleviation of membrane fouling during DCMD filtration of VERW. The initial flux of DCMD filtration of VERW pre-treated via EC-PEC improved by 35%, compared that only pre-treated by EC. Moreover, the concentration factor (CF) of the DCMD system reached up to 8.1 and the conductivity of distillate was less than 33.2 μS/cm. Hence, the EC and membrane distillation hybrid process paves a new way for the effective treatment of waste steam from resin production.

Original languageEnglish
Article number124004
JournalSeparation and Purification Technology
Volume318
Early online date4 May 2023
DOIs
Publication statusPublished - 1 Aug 2023

Bibliographical note

Funding Information:
The authors would like to thank the financial support from Natural Science Foundation of Shanghai (No. 20ZR1400100 ).

Keywords

  • DCMD
  • EC
  • Peroxi-electrocoagulation
  • Saline high organic wastewater
  • VERW

ASJC Scopus subject areas

  • Analytical Chemistry
  • Filtration and Separation

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