DingYuhao,ChengCheng,XiaoHuan,et al.Purification Efficiency of Rainwater by Bioretention Facility with Biochar-Chalcopyrite Composite Substrate[J].China Water & Wastewater,2026,42(17):123-130.
生物炭-黄铜矿基质生物滞留设施净化雨水效能
- Title:
- Purification Efficiency of Rainwater by Bioretention Facility with Biochar-Chalcopyrite Composite Substrate
- Keywords:
- bioretention facility; rainwater runoff; chalcopyrite; biochar; sulfur autotrophic denitrification
- 摘要:
- 为了提升生物滞留设施对雨水的净化效果，选取生物炭与黄铜矿作为复合基质，探究生物炭和黄铜矿的污染物泄漏与吸附特征，并分析该复合基质生物滞留设施对污染物的去除效能。结果表明，黄铜矿介导的硫自养反硝化在脱氮过程中发挥了重要作用。适量添加生物炭可以避免黄铜矿表面金属覆盖层的形成，从而显著提升总氮去除效率。在均添加10%黄铜矿的条件下，掺杂10%生物炭的试验组在5 d干旱期下的总氮去除率达到（39.8±1.3）%，较未添加生物炭的试验组提升了12.3%。此外，基质的含磷量是影响除磷效果的重要因素，由于生物炭是磷的泄漏源，其在淹没区的添加并未对PO43--P的去除产生积极作用；相比之下，黄铜矿对PO43--P表现出较强的吸附能力，且不会发生磷泄漏，显著提升了设施的除磷效果，是一种具备应用潜力的除磷基质。
- Abstract:
- To enhance the purification performance of bioretention facilities for rainwater treatment, biochar-chalcopyrite was selected as a composite substrate. The pollutants leaching and adsorption characteristics of biochar and chalcopyrite were investigated, and the pollutants removal efficiencies of the bioretention facility packed with this composite substrate were evaluated. The results showed that chalcopyrite-mediated sulfur autotrophic denitrification played an important role in the nitrogen removal process. The addition of an appropriate amount of biochar prevented the formation of a metal coating layer on the chalcopyrite surface, thereby significantly improving total nitrogen removal efficiency. Under the condition of 10% chalcopyrite addition in all treatments, the experimental group amended with 10% biochar achieved a total nitrogen removal rate of (39.8±1.3)% during a 5-day drought period, which was 12.3% higher than that of the treatment without biochar addition. Furthermore, the phosphorus content of the substrate was identified as a critical factor affecting phosphorus removal performance. Since biochar acted as a phosphorus leaching source, its incorporation into the submerged zone did not exert a positive effect on PO43--P removal. In contrast, chalcopyrite exhibited strong adsorption capacity for PO43--P without phosphorus leaching, thus significantly enhancing the phosphorus removal efficiency of the facility and showing promise as a potential phosphorus-removing substrate.
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