Assessment of Potential Risk to Aquatic Organisms by Zinc Originating from Swine Farm Effluent in a Rural Area of Japan

JARQ : Japan Agricultural Research Quarterly
ISSN 00213551
書誌レコードID(総合目録DB) AA0068709X
48-03-05.pdf393.46 KB

Commercial swine production can cause local water pollution if effluent water containing high levels of nitrogen (N), phosphorus (P), pathogen and heavy metals is discharged, but the actual status remains poorly documented. We thus selected zinc metal (Zn) as a tracer and conducted water quality observations in a rural river of Japan to reveal the significance of mid-sized swine farms on Zn pollution there. Results showed that one farm was the major contributor of Zn load in watershed, corresponding to 82% of total Zn load at a normal stage of water, which was apparently attributable to insufficient wastewater treatment at the farm. Consequently, the Zn concentration at the outlet was estimated at 37 μg L-1, revealing a significant ecological risk at 9.1% to aquatic organisms. We then analyzed the effectiveness of improved wastewater treatment of the farm and found that it had a plausible capacity to keep Zn concentration at the outlet below the environmental quality standard level (30 μg-Zn L-1) and the ecological risk at a safety level (<5%) as well. Based on these results, we concluded that since a swine farm could be a significant source of pollutants in rural areas, appropriate treatment of wastewater would be essential to sustain the potential pollution by Zn.

作成者 ITAHASHI Sunao KASUYA Masahiro SUZUKI Ryoji ABE Kaoru BANZAI Kenji

ecological risk

water quality

公開者 Japan International Research Center for Agricultural Sciences
国立情報学研究所メタデータ主題語彙集(資源タイプ) Journal Article
開始ページ 291
終了ページ 298
DOI 10.6090/jarq.48.291
権利 Japan International Research Center for Agricultural Sciences
言語 eng