Sino-Forest Applied Research Centre for Pearl River Delta Environment, Hong Kong Baptist University, Hong Kong; Department of Biology, Hong Kong Baptist University, Hong Kong.
Sino-Forest Applied Research Centre for Pearl River Delta Environment, Hong Kong Baptist University, Hong Kong; Department of Environmental Science, Periyar University, Salem, India.
Bioresour Technol. 2016 Aug;213:31-38. doi: 10.1016/j.biortech.2016.03.118. Epub 2016 Apr 1.
This study investigated the improvement in dewaterability of activated sludge (ACS) and anaerobically digested sludge (ADS) through bioacidification approach using iron-oxidizing bacterium, Acidithiobacillus ferrooxidans. ACS and ADS were treated with A. ferrooxidans culture with addition of different concentrations of energy substrate, in terms of Fe(2+):sludge solids ratio (0:1, 0.01:1, 0.05:1 and 0.1:1), and the dewaterability was assessed by determining the capillary suction time (CST), time to filter (TTF) and specific resistance to filtration (SRF) of the sludge. The results revealed that the levels of Fe(2+) significantly influenced the sludge acidification (pH⩽3). The CST, TTF and SRF values rapidly decreased in treated sludge, indicating that dewaterability of the sludge was significantly (p<0.05) improved than untreated sludge. This investigation clearly demonstrates that A. ferrooxidans culture, as biogenic flocculant, can be potentially used for improving the sludge flocculation, stabilization and dewaterability.
本研究通过利用铁氧化菌嗜酸氧化亚铁硫杆菌的生物酸化方法，研究了活性污泥（ACS）和厌氧消化污泥（ADS）脱水性能的改善。将 ACS 和 ADS 用嗜酸氧化亚铁硫杆菌培养液处理，并添加不同浓度的能量底物，以 Fe(2+)与污泥固体的比例（0:1、0.01:1、0.05:1 和 0.1:1）表示，通过测定污泥的毛细抽吸时间（CST）、过滤时间（TTF）和过滤比阻（SRF）来评估脱水性能。结果表明，Fe(2+)水平显著影响污泥酸化（pH ⩽ 3）。处理后的污泥 CST、TTF 和 SRF 值迅速下降，表明与未处理的污泥相比，污泥的脱水性能显著提高（p<0.05）。本研究清楚地表明，嗜酸氧化亚铁硫杆菌培养液作为生物絮凝剂，可用于改善污泥的絮凝、稳定和脱水性能。
