Enzyme treatment improves the performance of laboratory-scale vertical flow constructed wetland. (November 2018)

• Record Type: Journal Article
• Authors: Tang, Ping; Xiang, Zeshun; Zhou, Yongchao; Zhang, Yiping
• Is Part Of: Bioresource technology. Volume 268(2018)
• Page Start: 665
• Page End: 671
• Publication Date: 2018-11
• Subjects: Constructed wetland -- Bioclogging -- Enzyme treatment -- Microbial community; Biomass -- Periodicals; Biomass energy -- Periodicals; Bioremediation -- Periodicals; Agricultural wastes -- Periodicals; Factory and trade waste -- Periodicals; Organic wastes -- Periodicals; Bioénergie -- Périodiques; Déchets agricoles -- Périodiques; Déchets industriels -- Périodiques; Déchets organiques -- Périodiques; Déchets (Combustible) -- Périodiques; 662.88
• DOI: 10.1016/j.biortech.2018.08.048
• Languages: English
• ISSNs: 0960-8524

Abstract

Graphical abstract: Highlight: An enzyme treatment to alleviate bioclogging for CWs is proposed. Enzyme treatment improves the permeability and COD removal rate of CWs. The enzyme preparation can disperse the clogging matter through hydrolyzing polysaccharides. The abundance of Proteobacteria microbes increased by 89.4% after treatment. Abstract: An enzyme treatment was developed and evaluated for its effectiveness in alleviating bioclogging through a laboratory-scale vertical-flow constructed wetland (VFCW) experiment in this study. The enzyme preparation was a combination of α-glucoamylase and β-glucanase. The results show that the enzyme treatment greatly reduced bioclogging, and the peak hydraulic conductivity after treatment increased by a factor of 16, mainly because polysaccharides in the clogging matter were decomposed and the gelatinous clogging matter was dissolved and dispersed. The results also show that the abundance of Proteobacteria microbes increased by 89.4% after the enzyme treatment, although the diversity of the microbial community within the substrate decreased slightly. These microbes can increase the capability of the constructed wetland to purify influent water, and thus the rate of reduction of COD improved. It offers a solution to the problem of bioclogging in constructed wetlands.