木塑轻骨料生态浮岛的制备与性能OA

To promote high-value utilization of wood waste,using wood flour made from waste wood and wood-plastic(WP)aggregate made from recycled polyethylene granules,together with calcium sulfoaluminate(CSA)cement to pre-pare wood-plastic lightweight aggregate ecological floating islands(WPC-EF).Using the plastic-to-cement ratio(P/C)as the primary control variable,quantified alkalinity,mechanical properties,porosity,permeability,biofilm attach-ment,and wastewater purification performance.The results showed that,as P/C increased,the concrete alkalinity de-creased from 9.1 to 8.1.Compressive strength followed a pattern of increasing first and then decreasing,reaching a maximum at P/C=0.5,where the 3-28 d strengths increased form 2.65 MPa to 7.81 MPa.With increasing P/C,con-nected porosity increased from 22.9%to 44.3%,and total porosity increased from 35.7%to 53.7%.The permeability coefficient reached its maximum(4.85 cm/s)at P/C=0.5,coinciding with the highest biofilm mass and the most ad-vanced community development.For wastewater treatment,the specimen with P/C=0.5 exhibited the best overall re-moval performance,achieving removal efficiencies of 72.15%,86.7%,and 83.1%for NH4+-N,TN,and TP,respec-tively.In summary,P/C=0.5 provides a favorable balance between load-bearing capacity and ecological function,offer-ing effective technical support for the preparation and engineering application of ecological floating islands.