School of Ecology and Environmental Science & Yunnan Key Laboratory for Plateau Mountain Ecology and Restoration of Degraded Environments, Yunnan University, Kunming 650500, China.
School of Ecology and Environmental Science & Yunnan Key Laboratory for Plateau Mountain Ecology and Restoration of Degraded Environments, Yunnan University, Kunming 650500, China; Institute of International Rivers and Eco-security, Yunnan University, Kunming 650500, China.
Bioresour Technol. 2021 Jul;331:125061. doi: 10.1016/j.biortech.2021.125061. Epub 2021 Mar 26.
Granular biochar made from walnut shells was layered into sand-based constructed wetlands (CWs) to treat simulated mining-impacted water (MIW). The results showed that the biochar media exhibited markedly high capacities for metal binding and acidity neutralization, supported notably better plant growth and mitigated metal transfer from the plant roots to the shoots. The addition of organic liquid wastes (domestic sewage and plant straw hydrolysation broth) stimulated biogenic sulfate reduction after 40 d of adaptation to effectively remove multiple heavy metals in the MIW. The microbial community compositions were prominently regulated by organic carbon, with desirable communities dominated by Cellulomonas and Desulfobulbus formed in the CWs for MIW biotreatment. The role of macrophytes in the CWs in MIW treatment was insignificant and was dependent on operation conditions and metal species. A biochar-packed CW system with liquid organic waste supplementation was effective in metal removal and acidity neutralization of MIW.
由核桃壳制成的颗粒状生物炭分层置于沙基人工湿地（CWs）中，以处理模拟采矿影响的水（MIW）。结果表明，生物炭介质对金属结合和酸度中和具有明显高的容量，显著支持植物生长，并减轻了金属从植物根部向茎叶的转移。有机废液（生活污水和植物秸秆水解液）的添加在适应 40 天后刺激了生物成因的硫酸盐还原，有效地去除了 MIW 中的多种重金属。微生物群落组成受有机碳的显著调节，在 CWs 中形成了以纤维单胞菌属和脱硫弧菌属为主的理想群落，用于 MIW 的生物处理。在 MIW 处理中，CWs 中大型植物的作用并不重要，并且取决于操作条件和金属种类。带有液体有机废物补充的生物炭填充 CW 系统可有效去除 MIW 中的金属并中和酸度。
