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Perspectives on innovative non-fertilizer applications of sewage sludge for mitigating environmental and health hazards
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Researchers reviewed innovative non-fertilizer applications for sewage sludge — a growing waste stream rich in microplastics and chemical contaminants — arguing that repurposing sludge beyond traditional land spreading could reduce environmental and health hazards while recovering valuable resources.
As waste production increases and resources become limited, sewage sludge presents a valuable resource with potential beyond traditional land use and incineration. This review emphasizes exploring innovative non-fertilizer applications of sewage sludges and advocates for viewing wastewater treatment plants as sources of valuable feedstock and carbon sequestration. Innovative uses include integrating sewage sludge into construction materials such as asphalt pavements, geopolymer, cementitious composites, and masonry blocks. These methods not only immobilize heavy metals and mitigate environmental hazards but also support carbon sequestration, contrasting with incineration and land application methods that release carbon into the atmosphere. The review also addresses emerging technologies like bio-adhesives, bio-binders for asphalt, hydrogels, bioplastics, and corrosion inhibitors. It highlights the recovery of valuable materials from sewage sludge, including phosphorus, oils, metals, cellulose, and polyhydroxyalkanoates as well as enzyme production. By focusing on these non-fertilizer applications, this review presents a compelling case for re-envisioning wastewater treatment plants as sources of valuable feedstock and carbon sequestration, supporting global efforts to manage waste effectively and enhance sustainability.
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Sewage sludge as a sustainable fertilizer: Promise, pitfalls, and future directions
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This review examines both the promise and pitfalls of using sewage sludge as a fertilizer, finding that while it reduces agrochemical costs and provides nutrients for crops, it also introduces microplastics, pathogens, and heavy metals into agricultural soils with implications for food safety and public health.
Energy and material assessment of municipal sewage sludge applications under circular economy
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This review examines how municipal sewage sludge can be managed within a circular economy framework, including its energy and material recovery potential. Sewage sludge contains microplastics, heavy metals, and organic contaminants that complicate its safe use as a resource.
Assessing and Mitigating Risks of Emerging Contaminants in Fertilizer Production from Sewage Sludge: Challenges and Opportunities
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Treated sewage sludge (basically processed human waste) is increasingly recycled into fertilizer, but this review of existing research finds it can carry hidden risks like heavy metals, disease-causing germs, microplastics, and drug residues that may end up in soil, water, and potentially our food. The good news is that proper treatment methods, like composting or heat processing, can reduce these dangers, but the researchers stress that current regulations have gaps, meaning stronger oversight and monitoring are needed before this "waste-to-fertilizer" approach can be considered fully safe.
Thermal valorisation of sewage sludge into artificial aggregates: A critical review of processes, environmental performance, and circular bioeconomy implications
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This review of 180+ studies found that sewage sludge can be thermally converted into lightweight artificial aggregates with high compressive strength, with high-temperature sintering effectively immobilizing toxic metals like cadmium, chromium, and lead within the material. This is relevant to microplastic research because sewage sludge is one of the most microplastic-concentrated waste streams, and converting it into stable aggregates offers a pathway to contain both plastic particles and co-contaminant metals in an inert matrix.
Municipal Sludge Resource Recovery: Technologies, Challenges, and Future Directions
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This review paper looks at different ways to treat sewage sludge (the leftover waste from wastewater treatment plants) so it can be reused instead of dumped or burned. It found that one method, called pyrolysis (essentially baking the sludge at high heat without oxygen), is especially promising because it can break down harmful contaminants like microplastics, PFAS ("forever chemicals"), and drug-resistant bacteria genes while turning waste into a useful product called biochar. This matters because sludge is often recycled into fertilizer or soil products, so better treatment methods could reduce the chances of these harmful substances ending up in our
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