{"title":"污水污泥热化学处理对其磷浸出效率的影响:浸出行为和机理的启示","authors":"","doi":"10.1016/j.wasman.2024.09.004","DOIUrl":null,"url":null,"abstract":"<div><p>Thermochemical conversion, including hydrothermal processing, pyrolysis and incineration, has become a promising technology for sewage sludge (SS) treatment and disposal. Furthermore, acid leaching is considered as an effective method to recover phosphorus (P) from SS and its thermochemical treatment products. This study has investigated the potential of P reclamation from SS and its thermochemical derivatives, including hydrochar (HC), biochar (BC), and SS incinerated ash (SA). Comparative analyses of physicochemical properties of these derivatives revealed a decrease in hydroxyl and aromatic groups and an increase in aliphatic and oxygen-containing functional groups in HC and BC. Leaching experiments using 1 M sulfuric acid (H<sub>2</sub>SO<sub>4</sub>) and 1 M oxalic acid (C<sub>2</sub>H<sub>2</sub>O<sub>4</sub>) suggested that H<sub>2</sub>SO<sub>4</sub> slightly outperformed C<sub>2</sub>H<sub>2</sub>O<sub>4</sub> in terms of P leaching efficiency. HC achieved 79.1 % optimal leaching efficiency in 60 min using H<sub>2</sub>SO<sub>4</sub>, while BC, SS, and SA required 360 min to achieve comparable efficiency. SS and BC reached optimal leaching efficiency at 74.1 % and 76.2 % in H<sub>2</sub>SO<sub>4</sub>, while SA achieved 80.9 % in C<sub>2</sub>H<sub>2</sub>O<sub>4</sub>. Importantly, HC and SA are more favorable for P extraction using acid leaching, whereas BC tends to be a potential P carrier. Time-dependent kinetics revealed a two-stage leaching process, i.e., fast and slow reaction stages. Shrinking core model indicates product layer diffusion as the primary rate-limiting step in both stages. Overall, these fundamental insights play an important role in practical P recovery through acid leaching of SS derived residues after thermochemical treatment.</p></div>","PeriodicalId":23969,"journal":{"name":"Waste management","volume":null,"pages":null},"PeriodicalIF":7.1000,"publicationDate":"2024-09-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S0956053X24004914/pdfft?md5=278bab8023134680d9a36ffde37e5050&pid=1-s2.0-S0956053X24004914-main.pdf","citationCount":"0","resultStr":"{\"title\":\"Effect of thermochemical treatment of sewage sludge on its phosphorus leaching efficiency: Insights into leaching behavior and mechanism\",\"authors\":\"\",\"doi\":\"10.1016/j.wasman.2024.09.004\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><p>Thermochemical conversion, including hydrothermal processing, pyrolysis and incineration, has become a promising technology for sewage sludge (SS) treatment and disposal. Furthermore, acid leaching is considered as an effective method to recover phosphorus (P) from SS and its thermochemical treatment products. This study has investigated the potential of P reclamation from SS and its thermochemical derivatives, including hydrochar (HC), biochar (BC), and SS incinerated ash (SA). Comparative analyses of physicochemical properties of these derivatives revealed a decrease in hydroxyl and aromatic groups and an increase in aliphatic and oxygen-containing functional groups in HC and BC. Leaching experiments using 1 M sulfuric acid (H<sub>2</sub>SO<sub>4</sub>) and 1 M oxalic acid (C<sub>2</sub>H<sub>2</sub>O<sub>4</sub>) suggested that H<sub>2</sub>SO<sub>4</sub> slightly outperformed C<sub>2</sub>H<sub>2</sub>O<sub>4</sub> in terms of P leaching efficiency. HC achieved 79.1 % optimal leaching efficiency in 60 min using H<sub>2</sub>SO<sub>4</sub>, while BC, SS, and SA required 360 min to achieve comparable efficiency. SS and BC reached optimal leaching efficiency at 74.1 % and 76.2 % in H<sub>2</sub>SO<sub>4</sub>, while SA achieved 80.9 % in C<sub>2</sub>H<sub>2</sub>O<sub>4</sub>. Importantly, HC and SA are more favorable for P extraction using acid leaching, whereas BC tends to be a potential P carrier. Time-dependent kinetics revealed a two-stage leaching process, i.e., fast and slow reaction stages. Shrinking core model indicates product layer diffusion as the primary rate-limiting step in both stages. Overall, these fundamental insights play an important role in practical P recovery through acid leaching of SS derived residues after thermochemical treatment.</p></div>\",\"PeriodicalId\":23969,\"journal\":{\"name\":\"Waste management\",\"volume\":null,\"pages\":null},\"PeriodicalIF\":7.1000,\"publicationDate\":\"2024-09-11\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"https://www.sciencedirect.com/science/article/pii/S0956053X24004914/pdfft?md5=278bab8023134680d9a36ffde37e5050&pid=1-s2.0-S0956053X24004914-main.pdf\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Waste management\",\"FirstCategoryId\":\"93\",\"ListUrlMain\":\"https://www.sciencedirect.com/science/article/pii/S0956053X24004914\",\"RegionNum\":2,\"RegionCategory\":\"环境科学与生态学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q1\",\"JCRName\":\"ENGINEERING, ENVIRONMENTAL\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Waste management","FirstCategoryId":"93","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0956053X24004914","RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"ENGINEERING, ENVIRONMENTAL","Score":null,"Total":0}
引用次数: 0
摘要
热化学转化(包括水热处理、热解和焚烧)已成为一种前景广阔的污水污泥(SS)处理和处置技术。此外,酸浸法被认为是从 SS 及其热化学处理产品中回收磷(P)的有效方法。本研究调查了从 SS 及其热化学衍生物(包括水炭 (HC)、生物炭 (BC) 和 SS 焚烧灰烬 (SA))中回收磷的潜力。对这些衍生物的理化性质进行比较分析后发现,HC 和 BC 中羟基和芳香族官能团减少,脂肪族和含氧官能团增加。使用 1 M 硫酸(H2SO4)和 1 M 草酸(C2H2O4)进行的浸出实验表明,H2SO4 的磷浸出效率略高于 C2H2O4。HC 使用 H2SO4 在 60 分钟内达到 79.1% 的最佳浸出效率,而 BC、SS 和 SA 需要 360 分钟才能达到相当的效率。SS 和 BC 在 H2SO4 中的最佳浸出效率分别为 74.1% 和 76.2%,而 SA 在 C2H2O4 中的最佳浸出效率为 80.9%。重要的是,HC 和 SA 更有利于利用酸浸出提取磷,而 BC 则倾向于成为潜在的磷载体。随时间变化的动力学表明,沥滤过程分为两个阶段,即快速反应阶段和慢速反应阶段。缩芯模型表明,产物层扩散是这两个阶段的主要限速步骤。总之,这些基本见解对于通过酸浸出热化学处理后的 SS 衍生残渣来实际回收磷具有重要作用。
Effect of thermochemical treatment of sewage sludge on its phosphorus leaching efficiency: Insights into leaching behavior and mechanism
Thermochemical conversion, including hydrothermal processing, pyrolysis and incineration, has become a promising technology for sewage sludge (SS) treatment and disposal. Furthermore, acid leaching is considered as an effective method to recover phosphorus (P) from SS and its thermochemical treatment products. This study has investigated the potential of P reclamation from SS and its thermochemical derivatives, including hydrochar (HC), biochar (BC), and SS incinerated ash (SA). Comparative analyses of physicochemical properties of these derivatives revealed a decrease in hydroxyl and aromatic groups and an increase in aliphatic and oxygen-containing functional groups in HC and BC. Leaching experiments using 1 M sulfuric acid (H2SO4) and 1 M oxalic acid (C2H2O4) suggested that H2SO4 slightly outperformed C2H2O4 in terms of P leaching efficiency. HC achieved 79.1 % optimal leaching efficiency in 60 min using H2SO4, while BC, SS, and SA required 360 min to achieve comparable efficiency. SS and BC reached optimal leaching efficiency at 74.1 % and 76.2 % in H2SO4, while SA achieved 80.9 % in C2H2O4. Importantly, HC and SA are more favorable for P extraction using acid leaching, whereas BC tends to be a potential P carrier. Time-dependent kinetics revealed a two-stage leaching process, i.e., fast and slow reaction stages. Shrinking core model indicates product layer diffusion as the primary rate-limiting step in both stages. Overall, these fundamental insights play an important role in practical P recovery through acid leaching of SS derived residues after thermochemical treatment.
期刊介绍:
Waste Management is devoted to the presentation and discussion of information on solid wastes,it covers the entire lifecycle of solid. wastes.
Scope:
Addresses solid wastes in both industrialized and economically developing countries
Covers various types of solid wastes, including:
Municipal (e.g., residential, institutional, commercial, light industrial)
Agricultural
Special (e.g., C and D, healthcare, household hazardous wastes, sewage sludge)