Abstract Developing biosolids-based composts or soil blends suitable for use in urban areas is increasingly common. End uses for compost vary and can include use as a soil conditioner for existing turf, to establish new turf, for tree planting, in urban agriculture, and for use along highway right-of-ways. The carbon benefits/costs of biosolids compost were modeled for King County, Washington. Soil carbon sequestration was highest for use on disturbed soils such as new housing developments, neglected urban soils, or highway right-of-ways (–1.1 Mg CO2eq per Mg compost) and lowest for use in well-tended yards or other highly maintained landscapes (–0.036 Mg CO2eq per Mg compost). Compost use for tree growth, calculated over a 30-year period, added above-ground sequestration benefits ranging from –1.53 Mg CO2eq per Mg compost for a mature tree grown on a healthy soil to –4.58 Mg CO2eq per Mg compost for a newly planted tree grown on a disturbed site. Assuming a 20 km haul distance, transport costs ranged from 0.005 Mg CO2eq per Mg compost for delivery in a 5 Mg truck to 0.09 Mg CO2eq per Mg compost for pick up in a personal vehicle. Ecosystem services associated with different end uses for compost in urban areas also vary. This model suggests that while uses for biosolids compost will likely be varied, for a program as a whole, significant carbon benefits can be expected.

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城市地区堆肥使用的碳核算

摘要 开发适用于城市地区的基于生物固体的堆肥或土壤混合物越来越普遍。堆肥的最终用途各不相同，可以包括用作现有草皮的土壤调节剂、建立新草皮、植树、城市农业和高速公路沿线使用。生物固体堆肥的碳效益/成本以华盛顿州金县为模型。土壤碳封存在扰乱土壤上使用最高，例如新住房开发、被忽视的城市土壤或高速公路通行权（每 Mg 堆肥 –1.1 Mg CO2eq），而在精心照料的院子或其他高度维护的景观中使用最低（–0.036 Mg CO2eq 每镁堆肥）。在 30 年期间计算的用于树木生长的堆肥使用增加了范围从 –1 的地上封存效益。对于生长在健康土壤上的成熟树木，每 Mg 堆肥需要 53 Mg CO2eq，而对于生长在受干扰场地上的新种植树木，每 Mg 堆肥需要 –4.58 Mg CO2eq。假设运输距离为 20 公里，运输成本范围从 0.005 Mg CO2eq/Mg 堆肥在 5 Mg 卡车中运送到 0.09 Mg CO2eq/Mg 堆肥在个人车辆中提取不等。与城市地区堆肥的不同最终用途相关的生态系统服务也各不相同。该模型表明，虽然生物固体堆肥的用途可能会有所不同，但对于整个计划而言，可以预期显着的碳效益。09 Mg CO2eq 每 Mg 堆肥，用于在私人车辆中提取。与城市地区堆肥的不同最终用途相关的生态系统服务也各不相同。该模型表明，虽然生物固体堆肥的用途可能会有所不同，但对于整个计划而言，可以预期显着的碳效益。09 Mg CO2eq 每 Mg 堆肥，用于在私人车辆中提取。与城市地区堆肥的不同最终用途相关的生态系统服务也各不相同。该模型表明，虽然生物固体堆肥的用途可能会有所不同，但对于整个计划而言，可以预期显着的碳效益。