College of Forest Resource and Environment Science, Nanjing Forestry University, Nanjing 210037, Jiangsu, People's Republic of China.
Bioresour Technol. 2011 Nov;102(21):9927-32. doi: 10.1016/j.biortech.2011.08.049. Epub 2011 Aug 19.
The purpose of this study was to remove cadmium (Cd) and mercury (Hg) from non-point source wastewater by a hybrid bioreactor consisting of two different processes (anaerobic-anoxic-aerobic and photoautotrophic). The results showed that the bioreactor could concurrently culture heterotrophic and autotrophic microorganisms, and removed Cd and Hg from the wastewater successfully. The average removal efficiencies were 79% and 66%, respectively for Cd and Hg. The relationship between Cd removal rate and biofilm mass was observed to be significant (p<0.05) during different seasons. The Hg removal was mainly due to the bioaccumulation in macrophytes via a photoautotrophic process. Due to the increase of the bacterial diversity under the rejuvenated conditions modulated by the hybrid bioreactor, the growth conditions of the native bacterial habitat were improved. The results demonstrate that the environmentally benign, easily-deployed, sludge free and cost-effective hybrid bioreactor can efficiently remove Cd and Hg from non-point source wastewater.
本研究旨在通过由两种不同工艺（厌氧-缺氧-好氧和光自养）组成的混合生物反应器，从非点源废水中去除镉（Cd）和汞（Hg）。结果表明，该生物反应器可以同时培养异养和自养微生物，并成功地从废水中去除 Cd 和 Hg。Cd 和 Hg 的平均去除率分别为 79%和 66%。在不同季节，Cd 去除率与生物膜质量之间的关系显著（p<0.05）。Hg 的去除主要归因于通过光自养过程在大型植物中的生物积累。由于混合生物反应器调节的再生条件下细菌多样性的增加，改善了本地细菌栖息地的生长条件。结果表明，环保、易于部署、无污泥且具有成本效益的混合生物反应器可以有效地从非点源废水中去除 Cd 和 Hg。
