4.7 Article

Adsorptive removal of COD from produced water using tea waste biochar

Journal

ENVIRONMENTAL TECHNOLOGY & INNOVATION
Volume 23, Issue -, Pages -

Publisher

ELSEVIER
DOI: 10.1016/j.eti.2021.101563

Keywords

Biochar; Organic pollutants; COD; Adsorption; Produced water

Funding

  1. Universiti Teknologi PETRONAS under YUTP, Malaysia grant with cost center [015LCO190]

Ask authors/readers for more resources

This study investigated the effectiveness of tea waste biochar as an adsorbent for oxidizable organic contaminants in produced water. The combined modified biochar showed higher efficiency in COD removal, with Langmuir adsorption model and pseudo-second-order kinetic model being the most suitable for describing the process, achieving a maximum COD removal efficiency of 95.5%.
This study was conducted to explore the effectiveness of tea waste (TW) biochar (BC) as an adsorbent for the oxidizable organic contaminants measured as chemical oxygen demand (COD) in produced water (PW). BCs were prepared by modifying the TW with single (pre-pyrolysis) and combined (pre and post pyrolysis) treatments using phosphoric acid and hydrogen peroxide solutions. Based on FTIR, XPS, XRD and BET characterizations, the combined modified BC had higher oxygen-containing functional groups (-OH and-COOH), surface area (82 +/- 0.50 m(2)/g) and pore volume (0.08 +/- 0.001 cm(3)/g) compared to single modified BC (60 +/- 0.50 m(2)/g, 0.02 +/- 0.002 cm(3)/g). The Langmuir monolayer adsorption model best fitted both BCs with separation factor R-L < 1, showing favorable adsorption process. The controlling mechanism of the adsorption process was best described by the pseudo-second-order kinetic model with a coefficient of determination value of 0.995. The particle diffusion mechanism was demonstrated by the Weber-Morris plot. Taguchi method was used in Minitab 19 for optimization of operating factors i.e., pH, contact time and BC dosage. Maximum COD removal efficiencies were found to be 89.35 +/- 0.5% and 95.5 +/- 0.5% for single and combined modified BCs, respectively. The study provides a successful approach towards high level of COD removal from PW while reducing the waste generation and protecting the environment. (C) 2021 Elsevier B.V. All rights reserved.

Authors

I am an author on this paper
Click your name to claim this paper and add it to your profile.

Reviews

Primary Rating

4.7
Not enough ratings

Secondary Ratings

Novelty
-
Significance
-
Scientific rigor
-
Rate this paper

Recommended

No Data Available
No Data Available