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首页> 外文期刊>Journal of Environmental Management >Development of an innovative decentralized treatment system for the reclamation and reuse of strong wastewater from rural community: Effects of elevated CO_2 concentrations
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Development of an innovative decentralized treatment system for the reclamation and reuse of strong wastewater from rural community: Effects of elevated CO_2 concentrations

机译：开发创新的分散处理系统以回收和再利用农村社区的浓废水：CO_2浓度升高的影响

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In a previous study, a soil-plant-based natural treatment system was successfully developed for post-treatment of anaerobically digested strong wastewater full of potential nutrients (nitrogen, phosphorus, and potassium). For upgraded performance, an innovative decentralized treatment system was further developed, in which an anaerobic digestion stage and a natural treatment system stage are placed within a greenhouse. This allows the CO_2 generated by the processing of wastewater and biogas consumption to be sequestrated within the greenhouse for elevating its concentration level and potentially enhance nutrient removal and recovery from the applied wastewater. To investigate the feasibility of the system, a bench-scale experiment was conducted using CO_2 chambers. Valuable Kentucky bluegrass was planted in two soil types (red ball earth and black soil) at three CO_2 concentrations (340 ppm, 900 ppm, and 1400 ppm). The results confirmed the positive effects of elevated CO_2 concentration on the biomass production and turf quality of Kentucky bluegrass as well as the resulting higher nutrient recovery efficiencies. More importantly, it was demonstrated that the elevated CO_2 concentration significantly stimulated the soil nitrifying microorganisms and thus improved the nitrogen removal efficiency (a critical issue in ecological wastewater treatment). A CO_2 concentration of 1400 ppm is therefore recommended for use in the system. The mechanism underlying this phenomenon was shown to be an indirect effect, in which the higher CO_2 concentration first positively influenced growing plants, which then stimulated the soil nitrifier communities. The effects of soil type (a design parameter) and hydraulic and nutrient loading rates (an operational parameter) on system performance were also examined. The results favored black soil for system establishment. Based on the findings of this study, our proposed system is thought to have the potential to be scaled up and adopted by rural communities worldwide for the reclamation and reuse of strong wastewater, addressing the agricultural non-point source pollution, and achieving the sustainable development.
机译：在先前的研究中，成功​​开发了一种基于土壤植物的自然处理系统，用于厌氧消化的，富含潜在养分（氮，磷和钾）的强废水的后处理。为了提高性能，进一步开发了创新的分散处理系统，其中在温室内放置了厌氧消化阶段和自然处理系统阶段。这允许在温室中隔离由处理废水和沼气消耗产生的CO_2，以提高其浓度水平并潜在地提高养分的去除和从施用废水中的回收率。为了研究该系统的可行性，使用CO_2室进行了台式规模的实验。将宝贵的肯塔基州蓝草种植在两种土壤类型（红球土和黑土）中，三种二氧化碳浓度分别为（340 ppm，900 ppm和1400 ppm）。结果证实了升高的CO_2浓度对肯塔基州早熟禾的生物量生产和草皮质量以及所产生的更高的养分回收效率具有积极影响。更重要的是，事实证明，升高的CO_2浓度可显着刺激土壤硝化微生物，从而提高脱氮效率（生态废水处理中的关键问题）。因此，建议在系统中使用1400 ppm的CO_2浓度。事实证明，这种现象的潜在机制是间接的，其中较高的CO_2浓度首先对生长中的植物产生积极影响，然后刺激了土壤硝化器群落。还检查了土壤类型（设计参数）以及水力和养分加载速率（运行参数）对系统性能的影响。结果有利于黑土建立系统。根据这项研究的结果，我们提出的系统被认为有潜力被全球农村社区扩大规模并采用，以回收和再利用强废水，解决农业面源污染并实现可持续发展。 。

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