生物炭
生物固体
环境科学
固碳
废水
污水处理
废物管理
生命周期评估
温室气体
热解
制浆造纸工业
环境工程
环境化学
化学
生产(经济)
二氧化碳
生态学
生物
工程类
宏观经济学
经济
有机化学
作者
Kyle A. Thompson,Kyle K. Shimabuku,Joshua P. Kearns,Detlef R.U. Knappe,R. Scott Summers,Sherri M. Cook
标识
DOI:10.1021/acs.est.6b03239
摘要
Micropollutants in wastewater present environmental and human health challenges. Powdered activated carbon (PAC) can effectively remove organic micropollutants, but PAC production is energy intensive and expensive. Biochar adsorbents can cost less and sequester carbon; however, net benefits depend on biochar production conditions and treatment capabilities. Here, life cycle assessment was used to compare 10 environmental impacts from the production and use of wood biochar, biosolids biochar, and coal-derived PAC to remove sulfamethoxazole from wastewater. Moderate capacity wood biochar had environmental benefits in four categories (smog, global warming, respiratory effects, noncarcinogenics) linked to energy recovery and carbon sequestration, and environmental impacts worse than PAC in two categories (eutrophication, carcinogenics). Low capacity wood biochar had even larger benefits for global warming, respiratory effects, and noncarcinogenics, but exhibited worse impacts than PAC in five categories due to larger biochar dose requirements to reach the treatment objective. Biosolids biochar had the worst relative environmental performance due to energy use for biosolids drying and the need for supplemental adsorbent. Overall, moderate capacity wood biochar is an environmentally superior alternative to coal-based PAC for micropollutant removal from wastewater, and its use can offset a wastewater facility's carbon footprint.
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