Waste Valorisation and Contribution to the Circular Economy: The Evaluation of Water Treatment Sludge as a Phosphorus Adsorption Material and its Potential for Agricultural Reuse

IF 3.8 4区环境科学与生态学 Q2 ENVIRONMENTAL SCIENCES

Water, Air, & Soil Pollution Pub Date : 2024-12-21 DOI:10.1007/s11270-024-07699-w

Marcio Yukihiro Kohatsu, Maria do Carmo Calijuri, Renato Zimiani de Paula, Camila Clementina Arantes, Camila Neves Lange, Mariana Neves Ribeiro, Kayllane da Silva Novais, Julia de Morais Alves, Alessandro Lamarca Urzedo, Tatiane Araujo de Jesus

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Abstract

Aluminium-based coagulants are extensively used in water treatment, producing significant quantities of waste sludge (WTS), that poses challenges for landfill disposal. Eutrophication, mainly driven by phosphorus (P) enrichment from wastewater, remains a critical environmental concern in aquatic ecosystems. WTS contains substantial amounts of aluminium (Al), which exhibits a high affinity for phosphate. This study aimed to assess the phosphorus adsorption capacity (qmax) of WTS and its potential for agricultural use. The WTS samples were characterized using various analytical techniques. Kinetic and isothermal experiments were conducted using dried (105 °C) and calcined (650 °C) WTS samples. Characterization revealed crystallinity differences between dried WTS and calcined WTS Kinetic tests, indicating equilibrium times of 16 h for dried WTS and 1 h for calcined WTS. Isothermal tests showed maximum adsorption capacity values at pH 7 of 13.81 mgP g⁻¹ for dried WTS and 52.03 mgP g⁻¹ for calcined WTS, highlighting the enhanced phosphorus removal efficiency of calcined WTS. Phytotoxicity assessments demonstrated that dried and calcined WTS promoted enhancements in germination and root elongation of Lactuca sativa of 20 and 10%, respectively, suggesting its potential agricultural benefit. Therefore, WTS demonstrates promise for tertiary wastewater treatment, contributing to a circular economy by potentially reclaiming phosphorus-rich compounds for agricultural reuse.

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废物增值及其对循环经济的贡献：水处理污泥作为磷吸附材料的评价及其农业再利用潜力

铝基混凝剂广泛用于水处理，会产生大量废污泥 (WTS)，给填埋处理带来挑战。富营养化主要是由废水中的磷（P）富集引起的，它仍然是水生生态系统中一个重要的环境问题。WTS 含有大量铝 (Al)，而铝对磷酸盐有很高的亲和力。本研究旨在评估 WTS 的磷吸附能力（qmax）及其农业用途潜力。使用各种分析技术对 WTS 样品进行了表征。使用干燥（105 °C）和煅烧（650 °C）的 WTS 样品进行了动力学和等温线实验。表征结果显示，干燥 WTS 和煅烧 WTS 的结晶度存在差异动力学试验表明，干燥 WTS 的平衡时间为 16 小时，而煅烧 WTS 的平衡时间为 1 小时。等温测试表明，在 pH 值为 7 时，干燥 WTS 的最大吸附容量值为 13.81 mgP g-1，而煅烧 WTS 为 52.03 mgP g-1，这表明煅烧 WTS 的除磷效率有所提高。植物毒性评估表明，干燥和煅烧的 WTS 可促进乳齿植物发芽和根系伸长，分别提高 20% 和 10%，这表明它具有潜在的农业效益。因此，WTS 在废水三级处理方面大有可为，它有可能回收富含磷的化合物用于农业再利用，从而为循环经济做出贡献。

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来源期刊

Water, Air, & Soil Pollution 环境科学-环境科学

CiteScore

4.50

自引率

6.90%

发文量

448

审稿时长

2.6 months

期刊介绍： Water, Air, & Soil Pollution is an international, interdisciplinary journal on all aspects of pollution and solutions to pollution in the biosphere. This includes chemical, physical and biological processes affecting flora, fauna, water, air and soil in relation to environmental pollution. Because of its scope, the subject areas are diverse and include all aspects of pollution sources, transport, deposition, accumulation, acid precipitation, atmospheric pollution, metals, aquatic pollution including marine pollution and ground water, waste water, pesticides, soil pollution, sewage, sediment pollution, forestry pollution, effects of pollutants on humans, vegetation, fish, aquatic species, micro-organisms, and animals, environmental and molecular toxicology applied to pollution research, biosensors, global and climate change, ecological implications of pollution and pollution models. Water, Air, & Soil Pollution also publishes manuscripts on novel methods used in the study of environmental pollutants, environmental toxicology, environmental biology, novel environmental engineering related to pollution, biodiversity as influenced by pollution, novel environmental biotechnology as applied to pollution (e.g. bioremediation), environmental modelling and biorestoration of polluted environments. Articles should not be submitted that are of local interest only and do not advance international knowledge in environmental pollution and solutions to pollution. Articles that simply replicate known knowledge or techniques while researching a local pollution problem will normally be rejected without review. Submitted articles must have up-to-date references, employ the correct experimental replication and statistical analysis, where needed and contain a significant contribution to new knowledge. The publishing and editorial team sincerely appreciate your cooperation. Water, Air, & Soil Pollution publishes research papers; review articles; mini-reviews; and book reviews.