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首页> 外文期刊>Water >Improvement of Hydraulic and Water Quality Renovation Functions by Intermittent Aeration of Soil Treatment Areas in Onsite Wastewater Treatment Systems
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Improvement of Hydraulic and Water Quality Renovation Functions by Intermittent Aeration of Soil Treatment Areas in Onsite Wastewater Treatment Systems

机译：通过现场废水处理系统中土壤处理区的间歇曝气来改善水力和水质更新功能

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We tested intermittent aeration of the soil treatment area (STA) of onsite wastewater treatment systems (OWTS) for its ability to restore and maintain STA hydraulic flow and improve the water quality functions of conventional OWTS. Evaluation was conducted on hydraulically-failed conventional OWTS at three state-owned medical group homes in Washington County, RI, USA. Testing was conducted in two phases, with Phase I (before intermittent soil aeration (ISA)) comprising the first 6 months of the study, and Phase II (during ISA) the remaining 7 months. Intermittent soil aeration restored STA hydraulic function in all three systems despite a marked reduction in the STA total infiltrative surface. Soil pore water was collected from 30 and 90 cm below the STA during both phases and analyzed for standard wastewater parameters. Although the STA infiltrative surface was reduced—and the contaminant load per unit of area increased—after installation of the ISA system, no differences were observed between phases in concentration of total N, NO3, total P, or dissolved organic carbon (DOC). Apparent removal rates—which do not account for dilution or differences in infiltrative area—for total N, total P, and DOC remained the same or improved during Phase II relative to the pre-operation phase. Furthermore, intermittent soil aeration enhanced actual removal rates —which do account for dilution and differences in infiltrative area. The effects of ISA on actual removal of contaminants from STE increased with increasing hydraulic load—a counterintuitive phenomenon, but one that has been previously observed in laboratory studies. The results of our study suggest that intermittent soil aeration can restore and maintain hydraulic flow in the STA and enhance carbon and nutrient removal in conventional OWTS.
机译：我们测试了现场废水处理系统（OWTS）的土壤处理区域（STA）的间歇曝气，以了解其恢复和维持STA液压流量并改善常规OWTS的水质功能的能力。在美国RI华盛顿县的三个国有医疗小组房屋中对液压失效的常规OWTS进行了评估。测试分两个阶段进行，第一阶段（在间歇土壤通气（ISA）之前）​​包括研究的前6个月，第二阶段（在ISA期间）包括其余的7个月。尽管STA的总浸润面明显减少，但间歇的土壤通气恢复了所有三个系统的STA液压功能。在两个阶段中，均从STA下方30和90 cm处收集土壤孔隙水，并分析标准废水参数。安装ISA系统后，虽然STA的渗透表面减少了（单位面积的污染物负荷增加了），但是在总氮，NO 3 ，总P，或溶解的有机碳（DOC）。在阶段II中，相对于术前阶段，总氮，总磷和DOC的表观去除率（不考虑稀释度或渗透区域的差异）保持不变或有所提高。此外，间歇性土壤通气提高了实际去除率，这确实说明了稀释和渗透面积的差异。 ISA对实际从STE中去除污染物的影响随液压负荷的增加而增加，这是一种违反直觉的现象，但以前在实验室研究中已经发现。我们的研究结果表明，间歇性土壤通气可以恢复和维持STA中的水力流，并增强常规OWTS中的碳和养分去除。

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