采用糖蜜作为电子供体的生物硫酸盐还原法去除工业废水中的锌和硫酸盐的中试研究。

Pilot scale investigation of zinc and sulphate removal from industrial discharges by biological sulphate reduction with molasses as electron donor.

机构信息

Environmental Engineering and Management, Asian Institute of Technology, P.O. Box 4, Klongluang, Pathumthani 12120, Thailand.

出版信息

Environ Technol. 2009 Nov;30(12):1229-39. doi: 10.1080/09593330903233901.

DOI:10.1080/09593330903233901

PMID:19950465

Abstract

A biological sulphate reduction process, with molasses as an electron donor, was used for the removal of zinc and sulphate from Rayon industrial wastewater. The process involved reduction of sulphate to sulphide under anaerobic conditions. The sulphide-rich effluent was used to remove zinc as zinc sulphide precipitate. The investigation was conducted at pilot scale with real wastewater from the Rayon industry as feed. The effects of sulphate loading rate and temperature of feeding wastewater were evaluated. The experimental results showed that there was no significant difference in sulphide production when the reactor was operated at 50 +/- 2 degrees C and 65 +/- 2 degrees C. Sulphide production was in the range of 500-515 mg L(-1). In addition, an increase in sulphate loading rate from 6.3 +/- 0.7 kg SO4 m(-3) d(-1) to 14.9 +/- 2.4 kg SO4 m(-3) d(-1) resulted in a dramatic decrease in sulphate removal efficiency. Furthermore, zinc sulphide precipitation at pH 7 removed more than 96% of zinc.

摘要

采用生物硫酸盐还原工艺，以糖蜜作为电子供体，从人造丝工业废水中去除锌和硫酸盐。该工艺在厌氧条件下将硫酸盐还原为硫化物。富硫的废水被用于去除锌，形成硫化锌沉淀。该研究在中试规模上进行，以人造丝工业的实际废水为进料。考察了硫酸盐进料负荷和废水温度的影响。实验结果表明，当反应器在 50±2℃和 65±2℃下运行时，硫化物的生成没有明显差异。硫化物的生成量在 500-515mg/L 之间。此外，硫酸盐进料负荷从 6.3±0.7kgSO4m(-3)d(-1)增加到 14.9±2.4kgSO4m(-3)d(-1)，导致硫酸盐去除效率显著下降。此外，在 pH 值为 7 时进行硫化锌沉淀，可去除超过 96%的锌。