We can't find the internet
Attempting to reconnect
Something went wrong!
Hang in there while we get back on track
Long-Term Effects of Polyvinyl Chloride Microplastics on Anaerobic Granular Sludge for Recovering Methane from Wastewater
AI summary Read the abstract
Researchers studied the long-term effects of PVC microplastics on anaerobic granular sludge used in wastewater treatment over 264 days. They found that microplastic exposure significantly reduced organic matter removal efficiency by up to 35.5% and decreased methane production by up to 32.3%, while disrupting the protective biofilm around sludge granules. The study demonstrates that microplastic contamination in wastewater can impair the biological treatment processes that cities rely on for waste management and energy recovery.
Polyvinyl chloride microplastics (PVC-MPs) are emerging contaminants affecting biological wastewater treatment processes. However, most of the previous studies mainly focused on their short-term impacts on floc sludge, with little work being conducted to explore their potential effects on more complex anaerobic granular sludge (AGS), which has been widely used for high-strength organic wastewater treatment. In this paper, the long-term effects of PVC-MPs on AGS were investigated via continuous feeding tests that are representative of real wastewater treatment processes. The results of a continuous 264 days test showed that the prolonged exposure of PVC-MPs at 15-150 MPs·L-1 significantly (p = 7.86 × 10-37, 3.44 × 10-43, and 5.29 × 10-46) inhibited the COD removal efficiency of AGS by 13.2%-35.5%, accompanied by a 11.0%-32.3% decreased production of methane and 40.3%-272.7% increased accumulation of short-chain fatty acids (SCFAs). In addition, the PVC-MPs exposure suppressed the secretion of extracellular polymeric substances (EPS), causing AGS and the inside microorganisms to lose the protection of EPS, thereby resulting in granule breakage and decreased cells viability. Aligning with the deteriorated performance, the long-term exposure of PVC-MPs reduced the total microbial populations and the relative abundances of key methanogens and acidogens. A toxicity mechanism assessment revealed that the negative impacts induced by PVC-MPs are mainly attributed to the toxic leachate and excess oxidative stress.
More Papers Like This
Revealing How Polyvinyl Chloride Microplastic Physicochemically Affect the Anaerobic Digestion of Waste Activated Sludge
AI summary Read the abstract
PVC microplastics in sewage sludge change the surface chemistry of sludge flocs, raising the energy barrier between sludge and the microbes that break it down and causing microbial communities to reorganise. At low concentrations PVC initially increases contact efficiency, but at higher concentrations it coats sludge surfaces and blocks microbial access, ultimately reducing methane production in anaerobic digesters — a finding relevant to the performance and safety of wastewater treatment plants receiving plastic-contaminated sludge.
An in-depth analysis of microbial response to exposure to high concentrations of microplastics in anaerobic wastewater fermentation
AI summary Read the abstract
This study investigated how high concentrations of three common microplastic types affect the microbes used in anaerobic wastewater treatment, finding that microplastics reduced methane production by up to 56%. PVC had the most damaging effect on the microbial communities that break down waste, while polyethylene was somewhat less disruptive. The findings matter because impaired wastewater treatment means more pollutants, including microplastics themselves, could escape into waterways that feed human water supplies.
Effects of Microplastics Type, Particle Size, and Concentration on the Anaerobic Digestion of Food Waste and Residual Sludge: Methane Yield, Organic Matter Degradation
AI summary Read the abstract
Researchers co-digested food waste and residual sludge in the presence of polyethylene, polypropylene, and PVC microplastics of varying sizes and concentrations, finding that smaller particles and higher doses increasingly inhibited methane production — with 3 µm PVC at 100 particles/g-TS cutting cumulative methane by 54.6% and halting output entirely by day 17.
Revealing the Mechanisms of Polyethylene Microplastics Affecting Anaerobic Digestion of Waste Activated Sludge
AI summary Read the abstract
Researchers studied how polyethylene microplastics affect the anaerobic digestion of sewage sludge, a common wastewater treatment process. They found that higher concentrations of microplastics significantly reduced methane production by disrupting microbial communities and enzyme activities essential for digestion. The study reveals that microplastic contamination in wastewater systems can undermine the efficiency of sludge treatment and biogas generation.
Ecological Impact of PVC Microplastics on Microbial Communities in Wet Waste Treatment Systems
AI summary Read the abstract
Researchers reviewed how PVC microplastics disrupt microbial communities in wet waste treatment systems through a combination of surface aging, preferential colonization, and time-dependent leaching of chlorinated additives and plasticizers, with chronic stress — rather than acute toxicity — emerging as the dominant mechanism impairing methane production.
Research digests by email
When a large batch of papers lands in the Atlas, we read through it and send a short write-up of what stood out.