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Exploring the influence mechanisms of polystyrene-microplastics on sewage sludge composting
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Researchers conducted a 30-day composting experiment adding 0%, 0.5%, and 1% polystyrene microplastics to sewage sludge to examine how PS-MPs affect the composting process. They found that PS-MP additions reduced compost temperature, microbial biomass carbon, and volatile solid degradation by 2.6-4.8%, suggesting interference with microbial decomposition activity during sludge treatment.
To explore the influence mechanisms of polystyrene-microplastics (PS-MPs) on sewage sludge composting and put forward relevant composting adjustment strategies, a 30-day sewage sludge (SS) composting experiment was conducted by adding 0%, 0.5%, and 1% (w/w) PS-MPs. The addition of PS-MPs reduced compost temperature, microbial biomass carbon (MBC), and the degradation of volatile solids (2.6%-4.8%), and inhibited the activities of key enzymes (β-glucosidase and alkaline phosphatase) but increased urease activity in the thermophilic phase. Moreover, PS-MPs altered the relative abundance of dominant bacteria and changed the relevance of main enzymes and bacterial communities. Moreover, high levels of PS-MPs inhibited the contribution of dominant bacterial to alkaline phosphatase and β-glucosidase. Redundancy analysis revealed that PS-MPs affected the composting process mainly through reduced MBC at the mesophilic phase and temperature at the thermophilic phase. Thus, regulating MBC and temperature in specific phases could help overcome the adverse effects of PS-MPs on composting.
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Researchers found that polystyrene microplastics in sewage sludge affected the anaerobic digestion process used to treat waste, with low concentrations slightly boosting methane production but high concentrations reducing it by up to 11%. The microplastics disrupted key bacterial communities and enzyme activities needed for proper waste breakdown. This matters because wastewater treatment plants handle enormous volumes of microplastic-laden sludge, and impaired digestion could reduce treatment effectiveness and release more pollutants into the environment.
Occurrence, analysis of microplastics in sewage sludge and their fate during composting: A literature review
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This literature review synthesizes data on microplastic concentrations in sewage sludge from wastewater treatment plants across 18 countries, finding concentrations ranging from 7,910 to 495,000,000 particles per kilogram dry weight. The review discusses fate during composting and recommends inoculation with plastic-degrading microbes and high-temperature composting as promising remediation approaches.
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Researchers examined how adding polyethylene microplastic particles to sludge affects vermicomposting performance. The study found that higher microplastic concentrations reduced the efficiency of organic matter removal, impaired composting quality, and caused oxidative stress and neurotoxicity in earthworms, with bacterial diversity also declining in heavily contaminated treatments.
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Researchers tested the effect of polystyrene microplastics and their leached chemical additives on anaerobic digestion systems, finding that microplastic presence reduced methane generation efficiency and disrupted microbial community function.
Pyrolysis behavior of sewage sludge coexisted with microplastics: Kinetics, mechanism, and product characteristics
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Researchers investigated the co-pyrolysis behavior of sewage sludge mixed with polyethylene and polylactic acid microplastics. They found that the presence of microplastics improved the overall pyrolysis performance and altered the composition of the resulting bio-oil and gas products. The study suggests that understanding how microplastics in sewage sludge affect thermal treatment could help optimize waste processing at wastewater treatment plants.
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