Acid mine drainage (AMD) is among the most serious threats to water and the typical alkali-based treatment costs are high. This study’s main objective was the establishment of a highly efficient biological process using an upflow anaerobic sludge blanket (UASB) reactor to treat AMD based on a shorter hydraulic retention time (HRT) and lower organic matter input. The process was evaluated for a long-term operation (739 days) in terms of the influence of HRT (14–24 h), metal addition, sulfate loading rate (0.5–2.6 g SO₄²⁻ l⁻¹ d⁻¹), and the COD/SO₄²⁻ ratio (0.67–1.0) using ethanol as the only electron donor at a pH of 4.0. Neutral effluent pH was achieved throughout the time apart from operational modifications. The reduction in HRT from 24 to 16 h and an increase in the sulfate loading rate (SLR) up to 2.25 g SO₄²⁻ l⁻¹ d⁻¹ improved the sulfate removal to (92.1 ± 1.8)% with 80% chemical oxygen demand (COD) removal. However, the sulfate reduction was less than 80% when the HRT and SLR was changed to 14 h and 2.6 g SO₄²⁻ l⁻¹ d⁻¹, respectively. The oxidation of organic matter by sulfate reduction was greater than 50% regardless of the conditions imposed but the use of ethanol to treat AMD was more efficient when either the HRT was 16 h (1.5 g SO₄²⁻ l⁻¹ d⁻¹) in the presence of Fe, Zn, and Cu or the HRT was 14 h (2.6 g SO₄²⁻ l⁻¹ d⁻¹) but the COD/SO₄²⁻ ratio was reduced to 0.67. The fully optimized conditions of the UASB reactor were set at an HRT of 16 h, SLR of 1.5 g SO₄²⁻ l⁻¹ d⁻¹, and a COD/SO₄²⁻ ratio of 1.0.

中文翻译：

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UASB反应器处理酸性矿山排水的长期性能：硫酸盐上样速率，水力停留时间和COD / SO42-比率的影响。

酸性矿山排水（AMD）是对水的最严重威胁，典型的基于碱的处理成本很高。这项研究的主要目的是建立一个高效的生物工艺，该工艺使用上流厌氧污泥床（UASB）反应器，以较短的水力停留时间（HRT）和较低的有机质输入量为基础，处理AMD。根据HRT（14–24 h），金属添加，硫酸盐加载速率（0.5–2.6 g SO ₄ ^2-  l ^-1  d ^-1）的影响，评估了该工艺的长期运行（739天）。，以及COD / SO ₄ ²⁻pH值为4.0时使用乙醇作为唯一的电子给体的比率（0.67–1.0）。除了进行操作修改外，在整个时间内均达到了中性废水的pH值。在HRT至16小时的还原从24和2.25克的增加硫酸盐加载速率（SLR）向上SO ₄ ^2- 升^-1  d ^-1提高硫酸盐除去至（92.1±1.8）％，用80％的化学氧去除需求（COD）。然而，硫酸盐还原是当HRT和SLR改变为14小时和2.6g小于80％SO ₄ ^2- 升^-1  d ^-1， 分别。的有机物由硫酸盐还原该氧化是不管所施加的条件大于50％，但使用乙醇来治疗AMD是更有效的时，无论是HRT为16小时（1.5克SO ₄ ^2- 升^-1  d ^-1）在铁，锌，和Cu或HRT的存在是14小时（2.6克SO ₄ ^2- 升^-1  d ^-1），但COD / SO ₄ ^2-比降低到0.67。UASB反应器的完全优化的条件设定在16小时的HRT，1.5克SO SLR ₄ ^2- 升^-1  d ^-1，和COD / SO ₄ ^2-比为1.0。