The present study investigated the applicability of direct contact membrane distillation (DCMD) in the treatment of a reverse osmosis concentrate (ROC) from petrochemical wastewater. Three commercial flat sheet membranes made of polyethylene or polytetrafluoroethylene, having different contact angles, pore sizes, porosities, and thicknesses, were supplied by Aquastill with the following membrane designation: Standard, Oleophobic and Teflon. Firstly, the different DCMD membranes were characterised in experiments with deionised water. Then, tests with ROC, with a temperature setting to 60 °C in the feed and 20 °C on the distillate side, were performed in full recirculation mode (along 250 h operating time) and in concentration mode (along 72 h operating time, achieving volumetric concentration factors around 10). The DCMD performance, in terms of flux and quality of the distillate, was evaluated during all experiments under different operating conditions. After obtaining the results, all membranes satisfactorily achieved a final water recovery ratio close to 90 %, as well as high rejection factors (above 99.5 %) for all parameters analysed. They also produced high quality water with low electrical conductivity (around 2–7 μS cm–1). All conditions met the requirements for water reuse in the petrochemical sector. In this case, to treat wastewater with the tested characteristics, the oleophobic membrane from Aquastill presented better efficiency, with a minimum water vapour flux reduction and a water recovery ratio of 90 %.
|Original language||English (US)|
|Journal||Journal of Water Process Engineering|
|State||Published - Jan 9 2021|
Bibliographical noteKAUST Repository Item: Exported on 2022-06-14
Acknowledgements: This project was founded by CNPq (CNPq/BRICS-STI-2-442229/2017-8), RFBR (№ 18-58-80031), DST (DST/IMRCD/BRICS/PC2/From waste to resources/2018 (G)), NSFC (51861145313), NRF (No: 116020). The authors wish to acknowledge the Brazilian funding agencies (FINEP, FAPERGS, and CAPES). The assistance in assembling the DCMD equipment, provided by Prof. Dr. Suzana Pereira Nunes (KAUST), was greatly appreciated. The authors also wish to acknowledge Joana Carvalho (Aquastill b.v.) to gently provide the membranes and for providing information of the membranes characteristics and manufacturing process.
This publication acknowledges KAUST support, but has no KAUST affiliated authors.
ASJC Scopus subject areas
- Waste Management and Disposal
- Process Chemistry and Technology
- Water Science and Technology