Harran University, Environmental Engineering Department, Osmanbey Campus, 63000 Sanliurfa, Turkey.
Bioresour Technol. 2010 Dec;101(24):9508-14. doi: 10.1016/j.biortech.2010.07.113. Epub 2010 Aug 2.
Biotreatment of Cu- and Zn-containing synthetic wastewater was studied in sulfate-reducing up-flow (UFBR) and down-flow fluidized-bed reactors (DFBR) at 35 degrees C. The robustness of the systems was studied by stepwise increasing feed metal concentrations (total metal concentrations 25-300 mg/L) and decreasing feed pH (down to 2.0). Lactate was used as a carbon and energy source for sulfate reducing bacteria. After start-up, sulfate reduction and COD oxidation efficiencies were 60-86% and 87-95% in UFBR and, 40-88 and 55-95% in DFBR, respectively. Optimum COD/sulfate ratio for sulfate reduction was 0.85 and 1.25 for UFBR and DFBR, respectively. Approximately 70% and 55% of the electrons produced from lactate oxidation were used for sulfate reduction in UFBR and DFBR, respectively. Sulfide production and metal precipitation capacity of UFBR were higher than those of DFBR, although down-flow regime gave the possibility of metal recovery. Metals were precipitated more than 99% in both reactors. XRF analyses showed that metals were precipitated as metal-sulfides.
采用硫酸盐还原上流式（UFBR）和下流式流化床反应器（DFBR）在 35°C 下研究含 Cu 和 Zn 的合成废水的生物处理。通过逐步增加进料金属浓度（总金属浓度为 25-300mg/L）和降低进料 pH（低至 2.0）来研究系统的稳健性。乳酸被用作硫酸盐还原菌的碳源和能源。启动后，硫酸盐还原和 COD 氧化效率分别为 UFBR 中的 60-86%和 87-95%，DFBR 中的 40-88%和 55-95%。对于硫酸盐还原，最佳的 COD/硫酸盐比分别为 UFBR 和 DFBR 的 0.85 和 1.25。在 UFBR 和 DFBR 中，乳酸氧化产生的电子中约有 70%和 55%分别用于硫酸盐还原。尽管下流式条件提供了金属回收的可能性，但 UFBR 的硫化物生成和金属沉淀能力高于 DFBR。两种反应器中金属的沉淀率均超过 99%。XRF 分析表明，金属以金属硫化物的形式沉淀。
