Regeneration of copper-loaded pine bark biochar using simultaneous bio-sulfide precipitation of copper
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Published:2023-04-08
Issue:5
Volume:72
Page:577-592
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ISSN:2709-8028
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Container-title:AQUA — Water Infrastructure, Ecosystems and Society
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language:en
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Short-container-title:
Author:
Bashir Misbah1,
Mohan Chander1,
Annachhatre Ajit P.1ORCID
Affiliation:
1. 1 Indian Institute of Technology, Mandi, Himachal Pradesh, 175005, India
Abstract
Abstract
This research investigated adsorption of copper from aqueous solution onto the pine bark biochar, removal of adsorbed copper by bio-sulfide precipitation, and simultaneous regeneration of pine bark biochar adsorbent. A sulfidogenic reactor was established and operated under anaerobic conditions. During the sulfidogenic phase, COD:SO42− was gradually increased from 24:1 to 4:1. Use of sulfide-rich effluent from bio-sulfide reactor at neutral pH yielded above 99% copper removal from the aqueous solution. In the experiment's second stage, pine bark biochar was prepared through slow pyrolysis at 650 °C from pine bark residue that had a carbon content of 81% and a surface area of 368 m2/g. This biochar was then used in subsequent experiments. Initially, copper was adsorbed onto the biochar under neutral pH at contact time of 6 h. Maximum biochar adsorption capacity of 106 mg/g of copper was obtained. Finally, biochar was regenerated by precipitating the adsorbed copper as copper sulfide using sulfide-rich effluent from the sulfidogenic reactor. Complete recovery of adsorbed copper from biochar as copper sulfide precipitates were obtained was also confirmed by EDX-SEM analysis of biochar and precipitates. Regenerated biochar could be reused as an adsorbent in the subsequent adsorption cycle.
Funder
Ministry of Education, India
Subject
Management, Monitoring, Policy and Law,Pollution,Water Science and Technology,Ecology,Civil and Structural Engineering,Environmental Engineering
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