Godoi Leandro Augusto Gouvêa de, Foresti Eugenio, Damianovic Márcia Helena Rissato Zamariolli
Biological Processes Laboratory (LPB), São Carlos School of Engineering (EESC), University of São Paulo (USP), Av. João Dagnone, 1100, Santa Angelina, São Carlos, São Paulo, 13563-120, Brazil.
J Environ Manage. 2017 Jul 15;197:597-604. doi: 10.1016/j.jenvman.2017.04.027. Epub 2017 Apr 18.
A down-flow fixed-structured bed reactor (DFSBR) was operated for 277 days treating a mixture of synthetic substrates simulating an iron-rich acid mine drainage (AMD) and the soluble fraction of a sugarcane vinasse. The synthetic sugarcane vinasse was used as electron donor for biological sulfate-reduction, resulting in influent chemical oxygen demand (COD) close to 4000 mg L and volumetric organic loading rate of 4.8 g Ld. The influent sulfate concentration was kept close to 2000 mg L (volumetric sulfate loading rate of 2.5 g Ld) while a gradual increase of iron concentration (2-400 mg L) was applied. COD removal efficiencies were higher than 93% and the sulfate removal efficiencies were close to 100%. With the highest iron concentration (400 mg L) applied, the DFSBR achieved 95% of iron removal efficiency. The precipitate collected at the reactor bottom showed increasing concentrations of fixed suspended solids (FSS), as well as an increasing proportion of iron, indicating the possibility of metal recovery from the system. The association between sulfidogenic and methanogenic processes also enables energy recovery from the methane-rich biogas produced.
运行一个下流式固定结构床反应器（DFSBR）277天，处理模拟富含铁的酸性矿山排水（AMD）的合成底物混合物以及甘蔗酒糟的可溶部分。合成甘蔗酒糟用作生物硫酸盐还原的电子供体，进水化学需氧量（COD）接近4000 mg/L，体积有机负荷率为4.8 g/(L·d)。进水硫酸盐浓度保持在接近2000 mg/L（体积硫酸盐负荷率为2.5 g/(L·d)），同时铁浓度逐渐增加（2 - 400 mg/L）。COD去除效率高于93%，硫酸盐去除效率接近100%。在施加最高铁浓度（400 mg/L）时，DFSBR实现了95%的铁去除效率。在反应器底部收集的沉淀物显示固定悬浮固体（FSS）浓度增加，以及铁的比例增加，表明从系统中回收金属的可能性。硫酸盐还原和产甲烷过程之间的关联还使得能够从产生的富含甲烷的沼气中回收能量。
