Heavy Metals Removal from Swine Wastewater Using Constructed Wetlands with Horizontal Sub-Surface Flow

The removal efficiency of Cu and Zn from swine wastewater was evaluated as effected by three variables: the hydraulic retention time (HRT) (24, 48, 72 and 96 hours), two different plant species (Typha domingensis Pers. and Eleocharis cellulosa) and two different sizes of filter media (5 and 15 mm) using a horizontal sub-surface flow constructed wetland. From the results, a significant difference was observed in the removal efficiency of Cu and Zn with respect to different hydraulic retention times. The best results were obtained in the HRT of 96 hours for Zn where 96% removal of Zn with Typha domingensis Pers. specie with gravel of 15 mm (experimental unit 6) was achieved. For Cu, at 72 hours of HRT, the efficiency was nearly 100% in five of the six study units (1, 2, 3, 5 and 6). In contrast, in experimental unit 4 with gravel of 15 mm and without plants, only 86% Cu removal was achieved.

水平潜流人工湿地脱氮除磷研究进展

总结了水平潜流人工湿地的脱氮除磷机理,分析了进水水质、植物、基质、温度和水力停留时间这5种影响处理效果的主要因素,从不同角度论述了提高脱氮除磷效果所采取的措施,并探讨了水平潜流人工湿地存在的局限性和发展趋势。

碳源自供给潜流人工湿地中反硝化基因与碳氮比的关系

本研究构建了4套碳源自供给水平潜流人工湿地装置,以香蒲生物质发酵液作为外加碳源,考察了生物质发酵液投加量(进水碳氮比CODAdd/NO_3-N=1,2,3,4)与植物(Typha latifolia)对反硝化功能基因nirS、nirK和nosZ的影响。结果表明,三种基因在湿地系统中数量级分别为107~108、105和10~6~10~7拷贝数/g砾石。生物质发酵液能促进含nirS、nirK和nosZ的微生物生长;植物能促进含nirS、nirK微生物生长。