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首页> 外文期刊>Journal of Solid Waste Technology and Management >PRELIMINARY STUDY ON THE POTENTIAL USE OF FLY ASH AS A VENTILA TED IMPROVED PIT LA TRINE ADDITIVE
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PRELIMINARY STUDY ON THE POTENTIAL USE OF FLY ASH AS A VENTILA TED IMPROVED PIT LA TRINE ADDITIVE

机译:潜在使用粉煤灰作为通风改进的谷氨酸添加剂的初步研究

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摘要

This study describes the results of a series of laboratory experiments on aimed at developing of a protocol for the use of fly ash as a pit additive in the ventilated improved pit latrines (VIPs) in South Africa. Model VIP vaults were prepared in the laboratory and filled with syntheticfaecal sludge; and dosed with fly ash in amounts ranging from 5 to 20 % (w/w). The maximum leachable chemical oxygen demand (COD) accounted for 3.2 % of the total organic matter, while the maximum leachable ammonium accounted for 1.4 % of the leachable ammonium present in the synthetic faecalsludge. All phosphate in the synthetic faecal material was leachable. Mixing of the 20 % dose of fly ash into the synthetic faecal sludge resulted a minimum 98.9 % reduction (or about two log units) in the faecal coliform concentration after 28 days of incubation. As a result, addition offly ash can decrease microbial threats to public and environmental health threats from the VIP faecal wastes, but can cause environmental contamination with phosphate. The fly ash dose and the duration of the faecal sludge treatment require further optimisation. Relationship between the chemicalcomposition of the fly ash used as an additive to stabilise the VIP faecal sludge and the leaching of phosphorus from the sludge will also have to be investigated further.
机译:这项研究描述了一系列旨在针对粉煤灰在南非通风改进的坑式厕所(VIP)中使用粉煤灰作为坑道添加剂的协议的实验结果。在实验室中准备了VIP型保管库,并装有合成粪便污泥。并加入粉煤灰,含量为5%至20%(w / w)。最大可浸出化学需氧量(COD)占有机物总量的3.2%,而最大可浸出铵占合成粪便污泥中可​​浸出铵的1.4%。合成粪便中的所有磷酸盐都是可浸出的。孵育28天后,将20%剂量的粉煤灰混合到合成的粪便污泥中,可使粪便大肠菌群的浓度降低至少98.9%(或约两个对数单位)。结果,仅添加灰烬就可以减少VIP粪便废物对微生物的威胁,对公众和环境健康的威胁,但会导致磷酸盐污染环境。粉煤灰的剂量和粪便污泥处理的持续时间需要进一步优化。用作稳定VIP粪便污泥的添加剂的粉煤灰的化学组成与污泥中磷的浸出之间的关系也必须进一步研究。

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