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首页> 外文期刊>Compost Science & Utilization >Composting of Aged Reed Bed Biosolids for Beneficial Reuse: A Case Study in New Jersey, USA
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Composting of Aged Reed Bed Biosolids for Beneficial Reuse: A Case Study in New Jersey, USA

机译：老化芦苇床生物固体的堆肥以利于再利用：美国新泽西州的一个案例研究

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Reed beds with Phragmites australis (common reed) have been utilized to decrease the water, nutrient, and volatile solids content of sewage sludge. An efficient disposal/reuse option was sought for reed bed biosolids accumulated over a 15-year period at a wastewater treatment facility in New Jersey, USA. The study facility had 14 reed beds, each with 1000 wet tons capacity, which were full, and so the solids needed to be removed. Because P. australis is considered an invasive species in New Jersey and several other states in the United States, disposal or reuse of solids containing this plant is regulated. Composting was examined as a potential treatment for destroying the plant's reproductive rhizomes. The high temperatures achieved during composting were also tested to determine if regulatory criteria for pathogen reduction could be met, making the composted product suitable for unrestricted land application. Preliminary studies indicated the sludge had stabilized to the point where self-heating did not occur. Among the carbon amendments tested in the laboratory to stimulate compositing activity, Phragmites above-ground biomass was determined to be most suitable. In a field test, Phragmites above-ground biomass was mixed with reed bed biosolids at a 1: 2 (w/w) ratio. The temperatures achieved resulted in complete mortality of Phragmites rhizomes. In laboratory tests, rhizomes placed in a drying oven at 50 degrees C for 24 h, or 55 degrees C for 12 h, showed 100% plant mortality. However, under field conditions pile temperatures could not be maintained long enough for the sludge to meet the USEPA 503 biosolids time-temperature pathogen rule requirements for unrestricted land application, even though sample fecal coliform counts did meet regulatory limits.
机译：芦苇床与芦苇（普通芦苇）已被用于减少污水污泥的水，养分和挥发性固体含量。在美国新泽西州的废水处理设施中，对于15年内累积的芦苇床生物固体，寻求一种有效的处置/再利用选项。研究设施有14张芦苇床，每张芦苇床的容量为1000吨，已满，因此需要除去固体。由于在新泽西州和美国的其他几个州，澳大利亚假单胞菌被认为是一种入侵物种，因此含有该植物的固体的处置或再利用受到监管。堆肥被认为是破坏植物生殖根茎的一种潜在方法。还对堆肥过程中达到的高温进行了测试，以确定是否可以满足减少病原体的管理标准，从而使堆肥产品适用于不受限制的土地应用。初步研究表明，污泥已稳定到不会发生自热的程度。在实验室测试的可刺激复合活性的碳改性剂中，芦苇地上生物量被确定为最合适。在现场测试中，将芦苇地上生物量与芦苇床生物固体以1：2（w / w）的比例混合。达到的温度导致芦苇根茎完全死亡。在实验室测试中，将根茎放在干燥箱中于50摄氏度，24小时或55摄氏度，12小时的条件下，植物死亡率为100％。但是，在田间条件下，即使粪便中的大肠菌群计数确实满足法规要求，也无法将堆温维持足够长的时间，以使污泥无法满足USEPA 503生物固体时间-温度病原体对无限制土地使用的法规要求。

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