一个营养敏感流域五个现场污水系统的磷酸盐处理

IF 1.6 4区 地球科学 Q3 GEOSCIENCES, MULTIDISCIPLINARY
C. Humphrey
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引用次数: 2

摘要

过量的磷酸盐(P)负载到地表水增加生产力,有时造成不平衡,导致富营养化和水质退化。废水含有高浓度的磷和其他污染物,对环境健康构成威胁。许多农村地区使用现场废水系统(OWS),但大多数都没有监测去除P的效果。本研究的目的是为了更好地了解OWS在营养敏感流域对磷的处理效率。地下水监测基础设施,包括水井网络和压力表,安装在OWS在北卡罗莱纳州沿海的五个地点。收集了压力表的地下水样本和化粪池的废水样本,分析了磷酸盐和理化参数。结果表明,沟槽下方土壤中磷浓度显著降低(79.7 ~ 99.1%),但OWS附近和35个以上下坡的地下水中磷浓度相似,且相对于背景浓度显著升高。在有沙质土壤的地区,如胡德溪流域,OWS可能是地下水和地表水磷的来源。沙质土壤流域的养分管理政策应包括评估和减少OWS对地表水磷贡献的规定。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Phosphate Treatment by Five Onsite Wastewater Systems in a Nutrient Sensitive Watershed
Excess phosphate (P) loading to surface waters increases productivity sometimes causing an imbalance leading to eutrophication and water quality degradation. Wastewater contains elevated concentrations of P and other contaminants that pose threats to environmental health. Onsite wastewater systems (OWS) are used in many rural areas, but most are not monitored for P removal effectiveness. The goal of this research was to gain a better understanding of the P treatment efficiency of OWS in a nutrient-sensitive watershed. Groundwater monitoring infrastructure, including networks of wells and piezometers, was installed at five sites with OWS in coastal North Carolina. Groundwater samples from the piezometers and wastewater samples from the septic tanks were collected and analyzed for phosphate and physicochemical parameters. Results suggest that significant reductions in P concentrations (79.7 to 99.1%) were occurring in the soil immediately beneath the drainfield trenches, but P concentrations in groundwater near the OWS and more than 35 downgradient were alike and significantly elevated relative to background concentrations. OWS in areas with sandy soils such as the Hoods Creek watershed may be sources of P to groundwater and surface water. Nutrient management policies in watersheds with sandy soils should include provisions for assessing and reducing P contributions from OWS to surface waters.
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来源期刊
Earth Interactions
Earth Interactions 地学-地球科学综合
CiteScore
2.70
自引率
5.00%
发文量
16
审稿时长
>12 weeks
期刊介绍: Publishes research on the interactions among the atmosphere, hydrosphere, biosphere, cryosphere, and lithosphere, including, but not limited to, research on human impacts, such as land cover change, irrigation, dams/reservoirs, urbanization, pollution, and landslides. Earth Interactions is a joint publication of the American Meteorological Society, American Geophysical Union, and American Association of Geographers.
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