Fabrication of Wood-Plastic Composites as Biocarriers in Moving Bed Biofilm Reactors

N.D. Vu1,2,*,, T.T.T. Bui1,, Q.T. Pham1,, M.N. Nguyen1,, V.T. Nguyen1, and T.A.H. Nguyen3,

1Faculty of Chemistry, VNU University of Science, Vietnam National University, Hanoi, Vietnam

2Research Center for Environmental Technology and Sustainable Development, VNU University of Science, Vietnam National University, Hanoi, Vietnam

3Master’s Program in Environmental Engineering, VNU Vietnam Japan University, Vietnam National University, Hanoi; Luu Huu Phuoc St., Nam Tu Liem Dist., Hanoi, Vietnam

*Corresponding author: Tel: +84 0936187622; E-mail: vungocduy@hus.edu.vn

Abstract

In present study, a novel biocarrier was fabricated from wood and high density polyethylene (HDPE) using a single screw extruder. The effect of wood:plastic mass ratio on physico-chemical properties of the obtained wood plastic composite (WPC) was evaluated. While the tensile and flexural strengths were decreased, the sample density was increased with higher wood contents. The wood:plastic mass ratio of 1:1 was considered as the best for the production of WPC biocarriers. The role of this material in moving bed biofilm system was tested in a batch mode reactor having volume of 2 L with 20% filling by the biocarrier. The treatment efficiencies of organic matter, ammonia and phosphate were enhanced nearly two times. The results are attributed to heterogenous and porous surface of WPC, which enhances bacteria adhesion and pollutant removal. It demonstrates that WPC can be a potential biocarrier for use in moving bed biofilm reactors (MBBRs).

Keywords

Biocarrier, Wood plastic composite, Moving bed biofilm reactor, Wastewater treatment, Kinetics.

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