Innovative sponge-based moving bed-osmotic membrane bioreactor hybrid system using a new class of draw solution for municipal wastewater treatment

Nguyen Cong Nguyen, Shiao Shing Chen, Hau Thi Nguyen, Saikat Sinha Ray, Huu Hao Ngo, Wenshan Guo, Po Hsun Lin

Research output: Contribution to journalArticlepeer-review

58 Scopus citations

Abstract

For the first time, an innovative concept of combining sponge-based moving bed (SMB) and an osmotic membrane bioreactor (OsMBR), known as the SMB-OsMBR hybrid system, were investigated using Triton X-114 surfactant coupled with MgCl2 salt as the draw solution. Compared to traditional activated sludge OsMBR, the SMB-OsMBR system was able to remove more nutrients due to the thick-biofilm layer on sponge carriers. Subsequently less membrane fouling was observed during the wastewater treatment process. A water flux of 11.38 L/(m2 h) and a negligible reverse salt flux were documented when deionized water served as the feed solution and a mixture of 1.5 M MgCl2 and 1.5 mM Triton X-114 was used as the draw solution. The SMB-OsMBR hybrid system indicated that a stable water flux of 10.5 L/(m2 h) and low salt accumulation were achieved in a 90-day operation. Moreover, the nutrient removal efficiency of the proposed system was close to 100%, confirming the effectiveness of simultaneous nitrification and denitrification in the biofilm layer on sponge carriers. The overall performance of the SMB-OsMBR hybrid system using MgCl2 coupled with Triton X-114 as the draw solution demonstrates its potential application in wastewater treatment.

Original languageEnglish
Pages (from-to)305-313
Number of pages9
JournalWater Research
Volume91
DOIs
StatePublished - 15 Mar 2016

Keywords

  • Carrier
  • Draw solution
  • Forward osmosis
  • Moving bed
  • Osmotic membrane bioreactor
  • Sponge

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