Zhou Xu, Jiang Guangming, Wang Qilin, Yuan Zhiguo
Advanced Water Management Centre, The University of Queensland, St. Lucia, Queensland 4072, Australia.
Sci Rep. 2015 Jan 6;5:7516. doi: 10.1038/srep07516.
Improvement of sludge dewaterability is important for reducing the total costs for the treatment and disposal of sludge in wastewater treatment plants. In this study, we investigate the use of hydrogen peroxide as an oxidizing reagent for the conditioning of waste activated sludge. Significant improvement to sludge dewaterability was attained after the addition of hydrogen peroxide at 30 mg/g TS and 28 mg/g TS under acidic conditions (pH = 3.0), with the highest reduction of capillary suction time being 68% and 56%, respectively, for sludge containing an iron concentration of 56 mg Fe/g TS and 25 mg Fe/g TS, respectively. The observations were due to Fenton reactions between the iron contained in sludge (indigenous iron) and hydrogen peroxide. For the sludge with an insufficient level of indigenous iron, the addition of ferrous chloride was found to be able to improve the sludge dewaterability. The results firstly indicated that indigenous iron can be utilized similarly as the externally supplied iron salt to improve sludge dewaterability through catalyzing the Fenton reactions.
提高污泥脱水性能对于降低污水处理厂污泥处理和处置的总成本至关重要。在本研究中，我们研究了使用过氧化氢作为氧化剂对废弃活性污泥进行调理。在酸性条件（pH = 3.0）下，添加30 mg/g TS和28 mg/g TS的过氧化氢后，污泥脱水性能得到显著改善，对于铁浓度分别为56 mg Fe/g TS和25 mg Fe/g TS的污泥，毛细吸水时间的最大降幅分别为68%和56%。这些观察结果归因于污泥中所含铁（原生铁）与过氧化氢之间的芬顿反应。对于原生铁含量不足的污泥，发现添加氯化亚铁能够改善污泥脱水性能。结果首先表明，原生铁可与外部供应的铁盐类似地用于通过催化芬顿反应来提高污泥脱水性能。
