期刊
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
卷 147, 期 -, 页码 346-355出版社
ELSEVIER
DOI: 10.1016/j.psep.2020.09.039
关键词
Biodegradability; Response surface; Toxicity; Wastewater
资金
- Coordenacao de Aperfeicoamento de Pessoal de Nivel Superior - Brasil (CAPES) [001]
- Brazilian National Research Council (CNPq)
- Minas Gerais State ResearchFoundation (FAPEMIG)
The study demonstrates that electrocoagulation with Al and Fe electrodes can improve the biotreatability of acid and alkaline kraft pulp bleaching filtrates, leading to increased biodegradability and reduced biological toxicity.
Bleached kraft pulp mills generate large volumes of effluents usually treated by biological processes that dont remove recalcitrant organic constituents. The present study was undertaken to evaluate the potential of electrocoagulation of acid (AcF) and alkaline (AlF) kraft pulp bleaching filtrates with Al and Fe electrodes to improve their biotreatability. Response surface methodology was used to predict the effects of initial pH, current density, and electrolysis time on biodegradability (BOD/COD). Biodegradability increases of 1.7-2.1-fold were obtained using optimized experimental conditions for each electrode filtrate combination: AcF-Al (pH 7.9, 128 A/m(2), 49 min), AcF-Fe (pH 4.6, 104 A/m(2), 40 min), AlF-Al (pH 3.8, 150 A/m(2), 52 min) and AlF-Fe (pH 6.3, 101 A/m(2), 42 min). Electrocoagulation with Al electrodes was more efficient in removing color, phenols and estrogenic activity, but required longer reaction time and higher current density, while treatment with Fe electrodes resulted in lower toxicity to Daphnia similis. Electrocoagulation of both filtrates before combining them for biological treatment led to 88 % dissolved organic carbon (DOC) removal in a five-day biodegradability test, compared to only 27 % DOC removal from combined raw filtrates. The potential to increase overall pulp mill wastewater treatment efficiency using electrocoagulation prior to biological treatment was demonstrated. (C) 2020 Institution of Chemical Engineers. Published by Elsevier B.V. All rights reserved.
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