Department of Civil and Environmental Engineering, University of Alberta, 7-263 Donadeo Innovation Centre for Engineering, Edmonton, Alberta T6G 1H9, Canada; College of Environmental Science and Engineering, Hunan University, Changsha 410082, PR China; Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha 410082, PR China.
Department of Civil and Environmental Engineering, University of Alberta, 7-263 Donadeo Innovation Centre for Engineering, Edmonton, Alberta T6G 1H9, Canada.
Bioresour Technol. 2019 Aug;285:121351. doi: 10.1016/j.biortech.2019.121351. Epub 2019 Apr 15.
The source diverted blackwater treatment is receiving growing attention as an alternative to conventional energy intensive wastewater management and treatment systems. Blackwater, containing concentrated organic materials, can be anaerobically digested to recovery bioenergy. However, the methane recovery from blackwater is often inhibited by the presence of high free ammonia (FA) in blackwater. In order to improve the methane production in blackwater, nano-scale zero valent iron (nZVI, 35 nm or 50 nm) or micro-scale zero valent iron (mZVI, 200 μm) at different dosages (i.e., 0.5, 1, and 10 g/L) were applied respectively in the anaerobic digestion (AD) reactor for blackwater treatment. The results demonstrated that low doses (0.5-1 g/L) of nZVI slightly improved methane (CH) production, possibly due to a reduced oxidation-reduction potential (ORP) and improved hydrolysis-acidification in the nZVI supplemented systems. However, a lower biochemical methane potential (BMP) of blackwater was observed with high doses (10 g/L) of nZVI which induced a pH increase (>8.5) in AD reactor leading to a higher FA inhibition of CH production. In contrast, the effect of mZVI on blackwater AD system was not significant. The study demonstrated the successful application of nZVI for improving AD of blackwater, however, which requires dosage control.
作为传统高能耗废水管理和处理系统的替代方案，源分离黑水（厕所污水）处理越来越受到关注。黑水含有浓缩的有机物质，可以进行厌氧消化以回收生物能源。然而，高游离氨（FA）的存在常常抑制了从黑水中回收甲烷。为了提高黑水的甲烷产量，分别在不同剂量（0.5、1 和 10g/L）下向厌氧消化（AD）反应器中添加纳米零价铁（nZVI，35nm 或 50nm）或微纳米零价铁（mZVI，200μm）。结果表明，低剂量（0.5-1g/L）的 nZVI 略微提高了甲烷（CH）产量，这可能是由于氧化还原电位（ORP）降低和 nZVI 补充系统水解酸化改善所致。然而，高剂量（10g/L）的 nZVI 导致 AD 反应器 pH 值升高（>8.5），从而对 CH 产量产生更高的 FA 抑制作用，观察到黑水的生物化学甲烷潜力（BMP）较低。相比之下，mZVI 对黑水 AD 系统的影响不显著。该研究证明了 nZVI 成功地应用于改善黑水的 AD，但需要控制剂量。
