干旱区生态环境知识资源中心(Arid): Evaluation of pilot-scale biochar-amended woodchip bioreactors to remove nitrate, metals, and trace organic contaminants from urban stormwater runoff

Arid

DOI	10.1016/j.watres.2019.01.040
	Evaluation of pilot-scale biochar-amended woodchip bioreactors to remove nitrate, metals, and trace organic contaminants from urban stormwater runoff
	Ashoori, Negin 1,2; Teixido, Marc 1,3; Spahr, Stephanie 1,2; LeFevre, Gregory H.1,4,5; Sedlak, David L.1,3; Luthy, Richard G.1,2
通讯作者	Luthy, Richard G.
来源期刊	WATER RESEARCH
ISSN	0043-1354
出版年	2019
卷号	154 页码:1-11
英文摘要	Stormwater is increasingly being valued as a freshwater resource in arid regions and can provide opportunities for beneficial reuse via aquifer recharge if adequate pollutant removal can be achieved. We envision a multi-unit operation approach to capture, treat, and recharge (CTR) stormwater using low energy, cost-effective technologies appropriate for larger magnitude, less frequent events. Herein, we tested nutrient, metal, and trace organic contaminant removal of a pilot-scale CTR system in the laboratory using biochar-amended woodchip bioreactors following eight months of aging under field conditions with exposure to real stormwater. Replicate columns with woodchips and biochar (33% by weight), woodchips and straw, or woodchips only were operated with continuous, saturated flow for eight months using water from a watershed that drained an urban area consisting of residential housing and parks in Sonoma, California. After aging, columns were challenged for five months by continuous exposure to synthetic stormwater amended with 50 mu g L-1 of six trace organic contaminants (i.e., fipronil, diuron, 1H-benzotriazole, atrazine, 2,4-D, and TCEP) and five metals (Cd, Cu, Ni, Pb, Zn) frequently detected in stormwater in order to replicate the treatment unit operation of a CTR system. Throughout the eight-month aging and five-month challenge experiment, nitrate concentrations were below the detection limit after treatment (i.e., <0.05 mg N L-1). The removal efficiencies for metals in all treatments were >80% for Ni, Cu, Cd, and Pb. For Zn, about 50% removal occurred in the woodchip-biochar systems while the other systems achieved about 20% removal. No breakthrough of the trace organic compounds was observed in any biochar-containing columns. Woodchip columns without biochar removed approximately 99% of influent atrazine and 90% of influent fipronil, but exhibited relatively rapid breakthrough of TCEP, 2,4-D, 1H-benzotriazole, and diuron. The addition of straw to the woodchip columns provided no significant benefit compared to woodchips alone. Due to the lack of breakthrough of trace organics in the biochar-woodchip columns, we estimated column breakthrough with a diffusion-limited sorption model. Results of the model indicate breakthrough for the trace organics would occur between 10,000 and 32,000 pore volumes. Under ideal conditions this could be equivalent to decades of service, assuming failure by other processes (e.g., clogging, biofouling) does not occur. These results indicate that multiple contaminants can be removed in woodchip-biochar reactors employed in stormwater treatment systems with suitable flow control and that the removal of trace organic contaminants is enhanced significantly by addition of biochar. (C) 2019 Elsevier Ltd. All rights reserved.
英文关键词	Stormwater treatment Woodchip bioreactor Biochar Nitrate Trace organic contaminants Metals
类型	Article
语种	英语
国家	USA
收录类别	SCI-E
WOS记录号	WOS:000462104100001
WOS关键词	HEAVY-METALS ; ACTIVATED CARBON ; WATER ; DENITRIFICATION ; SYSTEMS ; BIODEGRADATION ; ADSORPTION ; RETENTION ; BACTERIA ; NITROGEN
WOS类目	Engineering, Environmental ; Environmental Sciences ; Water Resources
WOS研究方向	Engineering ; Environmental Sciences & Ecology ; Water Resources
来源机构	University of California, Berkeley
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/219269
作者单位	1.Natl Sci Fdn, Engn Res Ctr, Reinventing Nations Urban Water Infrastruct ReNUW, Stanford, CA USA; 2.Stanford Univ, Dept Civil & Environm Engn, Stanford, CA 94305 USA; 3.Univ Calif Berkeley, Dept Civil & Environm Engn, Berkeley, CA 94720 USA; 4.Univ Iowa, Dept Civil & Environm Engn, Iowa City, IA 52242 USA; 5.Univ Iowa, IIHR Hydrosci & Engn, Iowa City, IA USA
推荐引用方式 GB/T 7714	Ashoori, Negin,Teixido, Marc,Spahr, Stephanie,et al. Evaluation of pilot-scale biochar-amended woodchip bioreactors to remove nitrate, metals, and trace organic contaminants from urban stormwater runoff[J]. University of California, Berkeley,2019,154:1-11.
APA	Ashoori, Negin,Teixido, Marc,Spahr, Stephanie,LeFevre, Gregory H.,Sedlak, David L.,&Luthy, Richard G..(2019).Evaluation of pilot-scale biochar-amended woodchip bioreactors to remove nitrate, metals, and trace organic contaminants from urban stormwater runoff.WATER RESEARCH,154,1-11.
MLA	Ashoori, Negin,et al."Evaluation of pilot-scale biochar-amended woodchip bioreactors to remove nitrate, metals, and trace organic contaminants from urban stormwater runoff".WATER RESEARCH 154(2019):1-11.