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首页> 外文期刊>Ecological engineering: The Journal of Ecotechnology >Wastewater treatment at the Houghton lake wetland: Soils and sediments
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Wastewater treatment at the Houghton lake wetland: Soils and sediments

机译：霍顿湖湿地的废水处理：土壤和沉积物

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This paper describes the sediment and soils responses in a very long-running study of the capacity of a natural peatland to remove nutrients from treated wastewater. Data are here presented and analyzed from three decades of full-scale operation (1978-2007), during which large changes in the wetland soils occurred. An average of 600,000 m~3 y~(-1) of treated water was discharged each warm season to the Porter Ranch peatland near the community of Houghton Lake, Michigan. This discharge was seasonal, commencing no sooner than May 1 and ending no later than October 31. During the winter half-year, treated wastewater was stored at the lagoon site. This water contained 3.5 mg/L of total phosphorus, and 7 mg/L of dissolved inorganic nitrogen. Nutrients were stored in the 100 ha irrigation area, which removed 94% of the phosphorus (531) and 95% of the dissolved inorganic nitrogen. Phosphorus was stored in new biomass, increased soil sorption, and accretion of new soils and sediments, with accretion being dominant. Peat probings, water level increases and topographical surveys established quantitative measures of soil accretion. Over 30 cm of new soil developed, in which nutrient storage occurred. Phosphorus concentrations in the new soil were approximately 2000 mg P/kg, and the nitrogen concentration was 2-3%DW. The removal of TSS was effective, but minor in comparison to the internal generation and cycling of produced particulates. Later in the project history, the interior portion of impacted area became a floating mat. Sedimentation processes then occurred with no exposure to above-mat detrital processes. Trace element analyses showed no appreciable accumulation of heavy metals, other than the calcium and iron that characterized the antecedent wetland and the incoming water. Biomass cycling models were found to produce reasonable estimates of the measured nutrient accumulations. The light loadings of nutrients to this system produced dramatic effects in the ecosystem, but were lower than the range seen in some other treatment wetlands. Insufficient nitrogen was added to support the new biomass, and nitrogen fixation was identified as a possible compensatory mechanism.
机译：本文对天然泥炭地从处理过的废水中去除养分的能力进行了非常长时间的研究，描述了沉积物和土壤的响应。本文提供并分析了三十年全面运行（1978-2007年）期间的数据，在此期间湿地土壤发生了很大变化。每个温暖的季节，平均有600,000 m〜3 y〜（-1）的水被排放到密歇根州Houghton Lake社区附近的Porter Ranch泥炭地。此排放是季节性的，开始时间不早于5月1日，且不早于10月31日结束。在冬季的半年中，处理过的废水被储存在泻湖中。该水包含3.5 mg / L的总磷和7 mg / L的溶解的无机氮。营养物存储在100公顷的灌溉区域中，该区域除去了94％的磷（531）和95％的溶解无机氮。磷被储存在新的生物量中，增加了土壤的吸收，并增加了新的土壤和沉积物的积聚，其中积聚占主导。泥炭探测，水位上升和地形调查确定了土壤积聚的定量度量。超过30厘米的新土壤被开发出来，其中发生了养分储存。新土壤中的磷浓度约为2000 mg P / kg，氮浓度为2-3％DW。 TSS的去除是有效的，但与产生的颗粒的内部产生和循环相比却很小。在项目历史的后期，受影响区域的内部变成了浮动垫。然后发生沉淀过程，而没有暴露于地垫之上的碎屑过程。痕量元素分析表明，除了钙和铁（其特征是先前的湿地和入水）外，没有重金属的积累。发现生物质循环模型可以对测得的养分积累产生合理的估计。该系统的养分轻负荷对生态系统产生了巨大影响，但低于其他一些处理湿地的范围。添加的氮不足以支持新的生物量，并且固氮被确定为可能的补偿机制。

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