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首页> 外文期刊>Journal of Cleaner Production >Life cycle assessment comparing the treatment of surplus activated sludge in a sludge treatment reed bed system with mechanical treatment on centrifuge
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Life cycle assessment comparing the treatment of surplus activated sludge in a sludge treatment reed bed system with mechanical treatment on centrifuge

机译：生命周期评估将污泥处理芦苇床系统中剩余活性污泥的处理与离心机上的机械处理进行了比较

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摘要

In Denmark, the conventional method for treating sewage sludge is mechanical dewatering and subsequent storage. However, sludge treatment reed bed systems, which are holistic sludge treatment facilities combining the dewatering, mineralisation and storage of sludge, have been more common during the last three decades. Treatment of sludge in a sludge treatment reed bed system can be combined with post-treatment (further dewatering and mineralisation) on a stockpile area. This study aimed to compare the environmental performances of a mechanical sludge treatment method with the sludge treatment reed bed system strategy, using the life cycle assessment approach and a life cycle inventory based on newly generated data obtained from Danish reference facilities. The scenarios based on the different treatment methods were initiated by sludge entering the sludge treatment reed bed system or the centrifuge and terminated by land application of the final sludge product. The environmental impacts caused by the sludge treatment reed bed system strategy were comparable to or lower than those caused by the mechanical sludge treatment method. The impacts on climate change were the same for all the treatment scenarios; however, the conversion of organic carbon and nitrogen into gas species was more efficient in the sludge treatment reed bed system compared to mechanical treatment. Thus, mechanically treated sludge contained more nitrogen, causing higher nitrogen emissions (nitrous oxide, nitrate and ammonia) when applied on land. Furthermore, the impact of resource depletion was higher for mechanical dewatering due to a larger fossil fuel demand related to daily operation and longer transportation distances In this scenario. According to the results of the life cycle assessment, there were no considerable environmental gains made by combining the treatment of sludge in a sludge treatment reed bed system with post-treatment on a stockpile area. However, some practical aspects, which are not expressed in a life cycle assessment, should also be taken into consideration when evaluating the performances of sludge treatment scenarios. (C) 2018 Elsevier Ltd. All rights reserved.
机译：在丹麦，处理污水污泥的常规方法是机械脱水和随后的存储。然而，在过去的三十年中，污泥处理芦苇床系统是一种结合污泥的脱水，矿化和储存的整体污泥处理设施。污泥处理芦苇床系统中的污泥处理可与堆场的后处理（进一步脱水和矿化）结合使用。这项研究旨在使用生命周期评估方法和基于从丹麦参考设施获得的最新数据的生命周期清单，比较机械污泥处理方法与污泥处理芦苇床系统策略的环境性能。基于不同处理方法的方案是由污泥进入污泥处理芦苇床系统或离心机引发的，然后通过最终污泥产品的土地施用终止。污泥处理芦苇床系统策略所造成的环境影响与机械污泥处理方法所造成的环境影响相当或更低。所有治疗方案对气候变化的影响都是相同的；然而，与机械处理相比，污泥处理芦苇床系统将有机碳和氮转化为气体的效率更高。因此，机械处理的污泥含氮量更高，在土地上施用时会导致较高的氮排放量（一氧化二氮，硝酸盐和氨水）。此外，由于在这种情况下，与日常操作相关的化石燃料需求量更大，运输距离更长，因此机械脱水的资源消耗影响更大。根据生命周期评估的结果，将污泥处理芦苇床系统中的污泥处理与储备区的后处理相结合并没有获得可观的环境收益。但是，在评估污泥处理方案的性能时，还应考虑生命周期评估中未表达的一些实际方面。 （C）2018 Elsevier Ltd.保留所有权利。

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