Construction waste (CW) is produced in large quantities, resulting in severe land occupation and resource depletion. This study utilized CW as fillers to construct a denitrification biofilter (DNBF-CW) for treating secondary effluent from wastewater plants. Performance and mechanism were analyzed by water quality, biomass and its distribution, physicochemical characteristics, microbial community structure, extracellular polymeric substances and protein secondary structure analysis. Results indicated that DNBF-CW achieve NO3−-N and chemical oxygen demand (COD) removal efficiencies (RE) of 97 % and 70 %. The β-sheet of DNBF-CW increased from 47 % to 58 %, accompanied by decrease in random curls from 22 % to 0. Post-use CW showed potential as soilless cultivation substrates, boosting germination rates by 42 ± 7 %. Mechanism investigations elucidated that ZX3 improved efficiency by modulating microbial community composition, with Pseudomonas reaching 37 %. This study shows the multiple use of construction waste, which presents a novel, efficient, and eco-friendly solution for water treatment.

中文翻译：

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建筑垃圾作为反硝化生物过滤器填料用于废水中硝酸盐的利用：特性、性能、微生物群落和无土培养


建筑垃圾（CW）产生量大，占用土地严重，资源枯竭。本研究利用CW作为填料构建反硝化生物过滤器（DNBF-CW）来处理污水厂的二级出水。通过水质、生物量及其分布、理化特性、微生物群落结构、细胞外聚合物和蛋白质二级结构分析来分析性能和机理。结果表明，DNBF-CW 对 NO3−N 和化学需氧量 (COD) 的去除效率 (RE) 分别达到 97% 和 70%。 DNBF-CW 的 β 片层从 47% 增加到 58%，随机卷曲从 22% 减少到 0。使用后的 CW 显示出作为无土栽培基质的潜力，使发芽率提高 42 ± 7%。机制研究阐明ZX3通过调节微生物群落组成来提高效率，其中假单胞菌达到37%。这项研究展示了建筑垃圾的多重利用，为水处理提供了一种新颖、高效、环保的解决方案。