Department of Civil Engineering and Architecture, University of Pavia, Pavia, Italy.
Department of Civil, Environmental, Architectural Engineering and Mathematics, University of Brescia, Brescia, Italy.
Water Environ Res. 2020 Jan;92(1):11-25. doi: 10.1002/wer.1196. Epub 2019 Aug 21.
The sludge management represents a considerable amount of operational costs for wastewater treatment plants (WWTPs). Issues concerning the treatment and the recovery/disposal of biosolids are gaining importance especially in Lombardy region, where the biosolid landspreading on agricultural soils is a very common practice. The aim of this work was to evaluate the results obtained from a survey carried out on the biosolids/sludge, derived from WWTPs, ingoing to and outgoing from the STPs (sludge treatment plants-authorized for the treatment on behalf of third parties) located in Pavia Province. Moreover, the characterization of agricultural soils that receive the biosolids is carried out. Furthermore, the whole biosolid management chain, from production to landspreading on agricultural soils, was studied, highlighting the critical issues based on the survey results. The results obtained suggested the following actions: (a) the reduction of sludge production in WWTPs; (b) a more "controlled" production in terms of biosolid qualitative characteristics; (c) better "selection" of the sludge ingoing to STPs; and (d) more effective actions to control the "response" of the agricultural soils. Furthermore, full compliance with the best spreading practices on the soils is required, as well as a better use of agronomic skills to obtain a higher resource valorization. PRACTITIONER POINTS: In this work, the characteristics of biosolid spread in agricultural soils in Pavia Province were analyzed. The minimization of sludge production in WWTPs is encouraged in order to reduce critical issues related to biosolid management. The stabilization process in WWTPs should improve in order to obtain a better quality sludge. A better "selection" of the sludge ingoing to STPs and a more effective monitoring of the agricultural soils are encouraged.
污泥管理是污水处理厂（WWTP）运营成本的重要组成部分。与生物固体处理和回收/处置相关的问题在伦巴第地区尤为重要，在该地区，生物固体在农业土壤上的土地施用是一种非常常见的做法。本工作的目的是评估对来自帕维亚省污水处理厂（STP-代表第三方进行处理的获准处理厂）的生物固体/污泥进行调查所获得的结果。此外，还对接收生物固体的农业土壤进行了特性描述。此外，还研究了从生产到农业土壤施用的整个生物固体管理链，根据调查结果突出了关键问题。结果表明需要采取以下措施：（a）减少 WWTP 中的污泥产量；（b）在生物固体质量特性方面进行更“受控”的生产；（c）更好地“选择”进入 STP 的污泥；（d）采取更有效的措施来控制农业土壤的“反应”。此外，需要全面遵守在土壤上进行最佳施用的实践，以及更好地利用农业技能来实现更高的资源利用。从业者要点：在这项工作中，分析了帕维亚省农业土壤中施用生物固体的特性。鼓励减少 WWTP 中的污泥产量，以减少与生物固体管理相关的关键问题。应改善 WWTP 中的稳定化过程，以获得更好质量的污泥。鼓励更好地“选择”进入 STP 的污泥，并更有效地监测农业土壤。
