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Enhancing Pore-Water Drainage in Coastal Soft Soils: Enzymatic Degradation and Hydraulic Performance of Straw-PLA Vertical Drains
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Engineers are testing a plant-based alternative (straw and biodegradable plastic) to the plastic drains typically used to dry out and stabilize soft, waterlogged soil at coastal construction sites, swapping out materials that can shed harmful microplastics into rivers and oceans. This study found that special enzymes can speed up the breakdown of these eco-friendly drains in a controlled way, helping them work effectively without leaving behind long-lasting plastic pollution. For consumers, this matters because it points toward construction methods that reduce microplastic contamination in waterways, which is linked to concerns about microplastics entering
Prefabricated vertical drains are critical for accelerating pore-water pressure dissipation and consolidating water-saturated soft soils in coastal and riverine environments. Straw drainage boards, composed of agricultural straw and polylactic acid (PLA), offer an alternative to traditional plastic drains, mitigating potential water pollution and microplastic accumulation in sensitive aquatic ecosystems. However, their slow natural biodegradability can impact long-term hydraulic performance and post-construction settlement. This study investigates the enzymatic degradation characteristics of straw–PLA drainage boards to optimize their hydraulic behavior and degradation in simulated water-saturated soft soils. We explored the effects of various bio-enzymes, specifically cellulase and alkaline protease, on the structural integrity and hydraulic properties of the drainage boards. Our results demonstrate that both enzymes significantly alter the water flow capacity of the boards, indicating accelerated degradation. Furthermore, a synergistic effect was observed when cellulase and alkaline protease were applied concurrently, leading to more pronounced degradation. The findings suggest that enzyme-enhanced degradation offers a promising strategy to optimize the hydraulic performance of drainage boards, facilitating more effective pore-water pressure dissipation and rapid soil consolidation in offshore and coastal engineering projects.
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This review examines whether biodegradable plastics, often marketed as eco-friendly alternatives, actually break down safely in the environment. The evidence shows that biodegradable plastics often fragment into microplastics rather than fully decomposing, and these biodegradable microplastics can harm soil organisms, marine life, and disrupt nutrient cycles. The findings suggest that simply switching to biodegradable plastics may not solve the microplastic pollution problem and could introduce new environmental risks.
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Researchers reviewed how microplastics accumulate in soil and break down biologically, finding that certain microorganisms can form biofilms on plastic surfaces and use enzymes to slowly degrade the polymers — though conditions like pH, temperature, and moisture must be optimized and new plastic-degrading microbes need to be identified before this approach can be widely applied.
Microbial Strain Engineering for Microplastics Removal in Soils
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This book chapter reviews how microbial strains can be engineered or selected for enhanced plastic-degrading capability, examining the enzymes involved in polymer breakdown and the prospects for deploying engineered microbes in soil remediation applications.
Aging of biodegradable microplastics and their effect on soil properties: Control from soil water
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Researchers studied how biodegradable microplastics made from PLA and PBAT break down in different soil types under varying water conditions. They found that while these plastics aged more in dry and alternating wet-dry conditions, flooded conditions caused bigger changes to soil chemistry, including increased dissolved organic carbon. The study suggests that even biodegradable plastics can meaningfully alter soil properties, and the effects depend heavily on moisture conditions.
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