Adsorption recovery of phosphorus in contaminated water by calcium modified biochar derived from spent coffee grounds

Ying Liu; Shuyan Wang; Jiangbo Huo; Xinbo Zhang; HaiTao Wen; Dan Zhang; Ying Zhao; Dejun Kang; Wenshan Guo; Huu Hao Ngo

doi:10.1016/j.scitotenv.2023.168426

Adsorption recovery of phosphorus in contaminated water by calcium modified biochar derived from spent coffee grounds

Sci Total Environ. 2024 Jan 20:909:168426. doi: 10.1016/j.scitotenv.2023.168426. Epub 2023 Nov 7.

Authors

Ying Liu¹, Shuyan Wang¹, Jiangbo Huo¹, Xinbo Zhang², HaiTao Wen¹, Dan Zhang¹, Ying Zhao³, Dejun Kang⁴, Wenshan Guo⁵, Huu Hao Ngo⁶

Affiliations

¹ Joint Research Centre for Protective Infrastructure Technology and Environmental Green Bioprocess, School of Environmental and Municipal Engineering, Tianjin Chengjian University, Tianjin 300384, China; Tianjin Key Laboratory of Aquatic Science and Technology, Tianjin Chengjian University, Jinjing Road 26, Tianjin 300384, China.
² Joint Research Centre for Protective Infrastructure Technology and Environmental Green Bioprocess, School of Environmental and Municipal Engineering, Tianjin Chengjian University, Tianjin 300384, China; Tianjin Key Laboratory of Aquatic Science and Technology, Tianjin Chengjian University, Jinjing Road 26, Tianjin 300384, China. Electronic address: zxbcj2006@126.com.
³ State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China.
⁴ College of Civil Engineering of Fuzhou University, Fuzhou University, Fuzhou 350108, China.
⁵ Joint Research Centre for Protective Infrastructure Technology and Environmental Green Bioprocess, School of Environmental and Municipal Engineering, Tianjin Chengjian University, Tianjin 300384, China; Centre for Technology in Water and Wastewater, School of Civil and Environmental Engineering, University of Technology Sydney, Sydney, NSW 2007, Australia.
⁶ Joint Research Centre for Protective Infrastructure Technology and Environmental Green Bioprocess, School of Environmental and Municipal Engineering, Tianjin Chengjian University, Tianjin 300384, China; Centre for Technology in Water and Wastewater, School of Civil and Environmental Engineering, University of Technology Sydney, Sydney, NSW 2007, Australia. Electronic address: ngohuuhao121@gmail.com.

PMID: 37944608
DOI: 10.1016/j.scitotenv.2023.168426

Abstract

Phosphate recovery from water is essential for reducing water eutrophication and alleviating the phosphorus resource crisis. In this study, spent coffee grounds and CaCl₂ were used as raw materials and a modifier, respectively, to create a novel calcium modified biochar (MBC) for removing phosphorus from water. The modified biochar (MBC) was the best at removing phosphorous when the modifier concentration was 1.5 M with theoretically maximum adsorption capacity of 70.26 mg/g. MBC also performed well in the wide pH range of 3-11 under different phosphorus concentration gradients, with phosphorus removal efficiency of more than 50 %. According to kinetic analysis, the adsorption process at low phosphorus concentrations (50-100 mg/L) can be more properly described by the pseudo-first-order model, while the pseudo-second-order model best describes the adsorption process at high concentrations (200-600 mg/L). The thermodynamic analysis indicated that the adsorption process was spontaneous and endothermic. Characterization results revealed that surface precipitation, complexation, and ligand exchange were the dominant mechanisms of phosphorus adsorption. MBC has great potential to recover phosphorus from wastewater.

Keywords: Adsorption; Mechanism; Modified biochar; Phosphorus; Spent coffee grounds.

MeSH terms

Adsorption
Calcium / analysis
Charcoal / chemistry
Coffee
Kinetics
Phosphorus* / analysis
Water
Water Pollutants, Chemical* / analysis

Substances

Phosphorus
Calcium
biochar
Coffee
Water Pollutants, Chemical
Charcoal
Water