期刊
SEPARATION AND PURIFICATION TECHNOLOGY
卷 291, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.seppur.2022.120936
关键词
Landfill leachate concentrate; Electrocoagulation; Electrooxidation; Membrane distillation; Membrane fouling
资金
- National Natural Science Foundation of China [51508153]
- Fundamental Research Funds for the Central Universities [B200202107]
- Priority Academic Program Development of Jiangsu Higher Education Institutions [BK20150813]
This study investigated the treatment of landfill leachate concentrate using integrated processes such as electrocoagulation and electrooxidation. The results showed that these processes were effective in removing organic and inorganic contaminants, and showed improved performance when combined with membrane distillation.
The landfill leachate concentrate is a kind of waste water containing salt and refractory organics produced by the membrane bioreactor-nanofiltration/reverse osmosis process. In the present work, three integrated processes of electrocoagulation (EC)-direct contact membrane distillation (DCMD), electrooxidation (EO)-DCMD and EC-EODCMD were used to treat the leachate concentrate. The results show that the total organic carbon (TOC), Ca2+ and Mg2+ removal rates of the EC process were 40.52%, 98.03% and 88.84%, respectively, under the optimal operating conditions. The TOC removal rate of the EO process was 64.62% under the optimal operating conditions. The removal rates of TOC, Ca2+ and Mg2+ by combined EC-EO process were 82.16%, 99.04% and 94.22%, respectively. When the MD was applied together with the EC and EO steps, the flux improved 23% ~42%, which was confirmed by the SEM-EDS, FTIR and XRD analysis that only quite a small amount of humic acid and fulvic acid substances was observed to be randomly deposited on the membrane surface. During 72 h operation, the permeate had a lower conductivity than 15 mu S/cm, and only a small amount of organic (TOC < 9.6 mg/L) was detected. These results clearly demonstrated that the EC and EO processes can effectively reduce the refractory organics and scaling inorganics, and coupled with MD can synergistically to remove the pollutant that providing a better choice for the treatment of leachate concentrate.
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