Constructed wetland modified by biochar/zeolite addition for enhanced wastewater treatment

Abstract

Wastewater treatment for water reuse has received considerable attention owing to water resource shortage. One of the most effective wastewater treatment methods involves the use of constructed wetlands (CWs). In this study, synthetic wastewater was treated by using a biochar/zeolite CW. Phragmites australis (common reed) was translocated into two cylinders (lysimeters) that serve as vertical subsurface flow CWs. One CW (CW1) contained gravels as substrate layer, whereas the other CW (CW2) contained three substrate layers, namely, biochar, zeolite, and gravel layers. Response surface methodology was used for statistical analysis. In this study, CW2 performed better in removing pollutants from wastewater than CW1. At optimum pH (6.3) and retention time (57.4 h), 99.9% (1000 mg/L) COD, 99.9% (1000 mg/L) ammonia, 99.9% (50 mg/L) phenols, 99.9% (50 mg/L) Pb, and 99.9% (50 mg/L) Mn were removed by CW2. During this research, nitrous oxide emission was lower in CW2 than in CW1. (C) 2019 Elsevier B.V. All rights reserved.

Keywords

Biochar; Constructed wetland; Phragmites australis; Wastewater treatment; Zeolite

Published in

Environmental technology & innovation
2019, Volume: 16, article number: 100472Publisher: ELSEVIER

SLU Authors

• Abedi, Tayebeh

  • Department of Forest Genetics and Plant Physiology, Swedish University of Agricultural Sciences
    

Sustainable Development Goals

SDG6 Clean water and sanitation
SDG12 Responsible consumption and production


UKÄ Subject classification

Water Treatment


Publication identifier

DOI: https://doi.org/10.1016/j.eti.2019.100472

Permanent link to this page (URI)

https://res.slu.se/id/publ/103211