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首页> 外文期刊>Environmental Science & Technology >Environmental Benefits and Burdens of Phosphorus Recovery from Municipal Wastewater
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Environmental Benefits and Burdens of Phosphorus Recovery from Municipal Wastewater

机译：环境效益和市政废水中磷的回收负担

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摘要

The environmental benefits and burdens of phosphorus recovery in four centralized and two decentralized municipal wastewater systems were compared using life cycle assessment (LCA). In centralized systems, phosphorus recovered as struvite from the solids dewatering liquid resulted in an environmental benefit except for the terrestrial ecotcxicity and freshwater eutrophication impact categories, with power and chemical use offset by operational savings and avoided fertilizer production. Chemical-based phosphorus recovery, however, generally required more resources than were offset by avoided fertilizers, resulting in a net environmental burden. In decentralized systems, phosphorus recovery via urine source separation reduced the global warming and ozone depletion potentials but increased terrestrial ecotoxicity and salinization potentials due to application of untreated urine to land. Overall, mineral depletion and eutrophication are well-documented arguments for phosphorus recovery; however, phosphorus recovery does not necessarily present a net environmental benefit. While avoided fertilizer production does reduce potential impacts, phosphorus recovery does not necessarily offset the resources consumed in the process. LCA results indicate that selection of an appropriate phosphorus recovery method should consider both local conditions and other environmental impacts, including global warming, ozone depletion, toxicity, and salinization, in addition to eutrophication and mineral depletion impacts.
机译：使用生命周期评估（LCA），比较了四个集中式和两个分散式市政废水系统的环境效益和磷回收的负担。在集中式系统中，从固体脱水液中以鸟粪石的形式回收的磷除对陆地生态风险和淡水富营养化影响类别以外，还对环境产生了好处，其电力和化学品使用被运营节省量和避免的肥料生产所抵消。然而，基于化学的磷回收通常需要的资源比避免使用的肥料所抵消的资源要多，这导致了净环境负担。在分散系统中，通过尿源分离回收磷可减少全球变暖和臭氧消耗的潜力，但由于将未经处理的尿液施用到土地上，会增加陆地生态毒性和盐碱化潜力。总体而言，矿物质消耗和富营养化是磷回收的有据可查的论据。然而，磷的回收并不一定带来净的环境效益。虽然避免肥料生产确实减少了潜在的影响，但磷的回收并不一定能抵消过程中消耗的资源。 LCA结果表明，选择合适的磷回收方法除了要富营养化和减少矿物质消耗外，还应考虑当地条件和其他环境影响，包括全球变暖，臭氧消耗，毒性和盐碱化。

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  • 来源
    《Environmental Science & Technology》 |2015年第14期|8611-8622|共12页
  • 作者

    Zenah Bradford-Hartke; Joe Lane; Paul Lant; Gregory Leslie;

  • 作者单位

    School of Chemical Engineering, The University of New South Wales, Kensington 2052, Sydney, New South Wales, Australia;

    School of Chemical Engineering, The University of Queensland, St. Lucia 4072, Brisbane, Queensland, Australia;

    School of Chemical Engineering, The University of Queensland, St. Lucia 4072, Brisbane, Queensland, Australia;

    School of Chemical Engineering, The University of New South Wales, Kensington 2052, Sydney, New South Wales, Australia;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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  • 正文语种 eng
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