Issue 9, 2023

Efficient treatment of landfill leachate membrane bioreactor effluent through sequential coagulation–flocculation and electrooxidation

Abstract

This study investigated the performance of sequential chemical coagulation–electrooxidation (EO) processes in treating leachate membrane bioreactor (MBR) effluent. Polyaluminum chloride sulfate (PACS) was selected as the most effective coagulant for the chemical coagulation process, especially for removing suspended solids and color, and the operating parameters were optimized. Under optimum conditions, 79.3% chemical oxygen demand (COD), 81.2% total suspended solids (TSS), 86.1% ultraviolet absorbance at 254 nm (UV254), which represents the relative concentration of aromatic compounds, and 91.3% color removal efficiencies were obtained. The EO process was applied to the coagulation effluent to ensure the discharge limits, where graphite was chosen as the most efficient anode material in terms of both process performance and operating cost. The operating parameters of EO were optimized and under optimum conditions (pH: 7.14, 11 mA cm−2, and inter-electrode distance: 3 cm) in a reaction time of 150 min, 95.4% COD, 50.8% TSS, 81.2% UV254, and 83.6% color removal efficiencies were achieved. The sequential PACS + EO system provided the total removal efficiencies as 98.9% COD, 96.9% TSS, 97.1% UV254, and 99.4% color. The inlet COD was 4950 mg L−1 and the effluent COD of the sequential coagulation–EO process was 47.2 mg L−1. Sequential coagulation–EO process effluent provides receiving environment discharge limits.

Graphical abstract: Efficient treatment of landfill leachate membrane bioreactor effluent through sequential coagulation–flocculation and electrooxidation

Article information

Article type
Paper
Submitted
24 Apu 2023
Accepted
05 Jul 2023
First published
06 Jul 2023

Environ. Sci.: Water Res. Technol., 2023,9, 2253-2262

Efficient treatment of landfill leachate membrane bioreactor effluent through sequential coagulation–flocculation and electrooxidation

M. E. Bayat, O. N. Bilgin, G. Varank, S. Yazici Guvenc and E. Can-Güven, Environ. Sci.: Water Res. Technol., 2023, 9, 2253 DOI: 10.1039/D3EW00290J

To request permission to reproduce material from this article, please go to the Copyright Clearance Center request page.

If you are an author contributing to an RSC publication, you do not need to request permission provided correct acknowledgement is given.

If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given. If you want to reproduce the whole article in a third-party publication (excluding your thesis/dissertation for which permission is not required) please go to the Copyright Clearance Center request page.

Read more about how to correctly acknowledge RSC content.

Social activity

Spotlight

Advertisements