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- Title
Treatment of Dairy Farm Runoff in Vegetated Bioretention Systems Amended with Biochar.
- Authors
Rahman, Md Yeasir A.; Richardson, Nicholas; Nachabe, Mahmood H.; Ergas, Sarina J.
- Abstract
Nitrogen and fecal indicator bacteria (FIB) in runoff from concentrated animal feeding operations (CAFOs) can impair surface and groundwater quality. Bioretention systems are low impact nature-based technologies that can effectively treat CAFO runoff if modified with an internal water storage zone (IWSZ) or amended with biochar. In this study, the performances of four pilot-scale modified bioretention systems were compared to assess the impacts of (1) amending bioretention media with biochar and (2) planting the systems with Muhlenbergia. The system with both plants and biochar amendment had the best performance, with an average of 5.58 log reduction in E. coli and 98% removal of total nitrogen (TN). All systems treated the first pore volume well as new runoff flushed the treated water from the IWSZ. Biochar improved TN and FIB removal due to its high capacity to adsorb or retain ammonium (NH4+), dissolved organic nitrogen, dissolved organic carbon, and E. coli. Planting improved performance, possibly by increasing rhizosphere microbial activity.
- Subjects
BIOSWALES; FACTORY farms; DAIRY farms; BIOCHAR; ESCHERICHIA coli; RUNOFF
- Publication
Water (20734441), 2024, Vol 16, Issue 10, p1347
- ISSN
2073-4441
- Publication type
Article
- DOI
10.3390/w16101347