BAM Federal Institute for Materials Research and Testing, Division 4.4 Thermochemical Residues Treatment and Resource Recovery, Unter den Eichen 87, D-12205 Berlin, Germany.
Environ Sci Technol. 2013 Jan 2;47(1):563-7. doi: 10.1021/es300610e.
Sewage sludge ash (SSA) is a prospective phosphorus source for the future production of recycling P-fertilizers. Due to its high heavy metals contents and the relatively low P plant-availability, SSA must be treated before agricultural utilisation. In this paper SSA was thermochemically treated with PVC in a bench-scale rotary furnace in order to remove heavy metals via the chloride pathway. PVC has a high Cl-content of 52-53% and a high heating value that can be beneficially used for the thermochemical process. Large amounts of waste PVC are already recovered in recycling processes, but there are still some fractions that would be available for the proposed thermochemical process, for example, the low quality near-infrared(NIR)-fraction from waste separation facilities. Heavy metals were effectively removed at temperatures in the range of 800-950 °C via the gas phase by utilisation of PVC as Cl-donor. The resulting P plant-availability was comparable to SSA thermochemically treated with MgCl(2) as Cl-donor if MgO was used as an additive (Mg-donor). A further increase of the plant availability of phosphorus was achieved by acid post-treatment of the thermochemically treated SSA.
污水污泥灰（SSA）是未来生产回收 P 肥料的潜在磷源。由于其重金属含量高，而 P 植物利用率相对较低，因此在农业利用之前，SSA 必须进行处理。本文采用 PVC 在实验室规模的旋转炉中对 SSA 进行热化学处理，通过氯化物途径去除重金属。PVC 的氯含量高达 52-53%，热值高，可用于热化学过程。大量的废 PVC 已经在回收过程中得到回收，但仍有一些废 PVC 可用作拟议的热化学过程，例如废物分离设施的低质量近红外（NIR）废 PVC 。在 800-950°C 的温度范围内，通过利用 PVC 作为 Cl 供体，通过气相有效去除重金属。如果使用 MgO 作为添加剂（Mg 供体），则与用 MgCl(2) 作为 Cl 供体处理的 SSA 的植物可利用磷相当。通过对热化学处理的 SSA 进行酸后处理，进一步提高了磷的植物利用率。
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