Department of Chemistry, University of Science & Technology of China, Hefei 230026, China; State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150090, China.
Bioresour Technol. 2013 Dec;149:38-43. doi: 10.1016/j.biortech.2013.09.041. Epub 2013 Sep 17.
Efficient decolorization of reactive blue 13 was achieved by a combined use of anaerobic sludge and zero-valent iron (ZVI), and the underlying mechanism of this process was elucidated, Addition of 1.0 g/L ZVI into sludge accelerated the decolorization, with the decoloration ratio after 1-h treatment increased by 29.4% compared with the sum of the individual systems, indicating a synergy between the sludge and ZVI. Meanwhile, substantial changes in sludge morphology and microbial community were observed. The increased dye removal by ZVI was mainly attributed to: (1) a directly chemical reduction and aggregation; and (2) creation of a more favorable pH and anaerobic environment for microorganisms. The acid production by acidogens also partially offset the pH rise in ZVI corrosion and would alleviate ZVI deactivation. This work might offer valuable implications for the optimization and practical application of ZVI-anaerobic sludge processes for treatment of azo dyes or other recalcitrant pollutants.
厌氧污泥和零价铁（ZVI）的联合使用实现了活性蓝 13 的高效脱色，阐明了该过程的潜在机制。向污泥中添加 1.0 g/L 的 ZVI 可加速脱色，与单独体系的总和相比，1 小时处理后的脱色率提高了 29.4%，表明污泥和 ZVI 之间存在协同作用。同时，观察到污泥形态和微生物群落发生了重大变化。ZVI 增加的染料去除主要归因于：（1）直接的化学还原和聚集；以及（2）为微生物创造了更有利的 pH 值和厌氧环境。产酸菌的产酸也部分抵消了 ZVI 腐蚀过程中 pH 值的升高，从而缓解了 ZVI 的失活。这项工作可能为优化和实际应用 ZVI-厌氧污泥工艺处理偶氮染料或其他难降解污染物提供有价值的启示。
