This study intended to assess the performance of a sulfidogenic activated carbon-bed bioreactor (SACB) receiving high concentrations of hexavalent chromium (Cr⁶⁺). SACB was tested for 126 days at moderate temperature (20 °C) with a synthetic feed carrying ethanol as carbon source while employing a hydraulic retention time of 24 h. Excellent sulfidogenic performance was obtained during both nonCr⁶⁺ added and 100 mg L⁻¹ Cr⁶⁺ added periods. Sulfate reduction and carbon oxidation performances initially were 99% and 93%, respectively, and introduction of 100 mg L⁻¹ Cr⁶⁺ to the feed at pH 4.0 resulted in only 3% reduction for both performances. During initial testing period, alkalinity generation was 99% of the theoretically expected value, and effluent pH increased up to 8.2 from pH 6.7. During the Cr⁶⁺ fed period, average alkalinity concentration was 2316 mgCaCO₃ L⁻¹ while pH increased to 8.2 from pH 4.0 with additional acidity consumption during Cr⁶⁺ reduction by the biologically generated sulfide. Effluent Cr⁶⁺ concentration remained below 0.5 mg L⁻¹ with an average of 0.13 mg L⁻¹, whereas average total chromium concentration in the effluent remained ≤0.2 mg L⁻¹. Batch studies were carried out to better understand stoichiometry and kinetics of Cr⁶⁺ reduction with biogenic sulfide.

本研究旨在评估接受高浓度六价铬 (Cr ⁶⁺ )的硫化活性碳床生物反应器 (SACB ) 的性能。SACB 在中等温度 (20 °C) 下进行了 126 天的测试，合成原料携带乙醇作为碳源，同时采用 24 小时的水力停留时间。在不添加Cr ⁶⁺和添加 100 mg L ^-1 Cr ⁶⁺期间都获得了优异的硫化性能。硫酸盐还原和碳氧化性能最初分别为 99% 和 93%，并引入 100 mg L ^-1 Cr ⁶⁺在 pH 4.0 时添加到进料中，两种性能仅导致 3% 的降低。在初始测试期间，产生的碱度为理论预期值的 99%，出水 pH 值从 6.7 升至 8.2。在 Cr ⁶⁺供给期间，平均碱度浓度为 2316 mgCaCO ₃ L ^-1而 pH 值从 pH 4.0 增加到 8.2，并在 Cr ⁶⁺被生物生成的硫化物还原期间消耗额外的酸度。出水Cr ⁶⁺浓度保持在0.5 mg L ^{-1 以下}，平均为0.13 mg L ^-1，而出水平均总铬浓度保持≤0.2 mg L ^-1. 进行批量研究以更好地了解使用生物硫化物还原Cr ^{6+ 的}化学计量和动力学。