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.
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机译：污泥脱水性的提高对于减少废水处理厂中污泥处理和处置的总成本很重要。在这项研究中，我们调查了过氧化氢作为氧化剂用于处理废活性污泥的方法。在酸性条件下（pH = 3.0）加入30 mg / g TS和28 mg / g TS的过氧化氢后，污泥的脱水性得到了显着改善，毛细管抽吸时间的最大减少分别为68％和56％ ，分别用于铁含量为56 mg Fe / g TS和25 mg Fe / g TS的污泥。观察结果是由于污泥中的铁（本地铁）和过氧化氢之间发生了Fenton反应。对于天然铁含量不足的污泥，发现添加氯化亚铁能够改善污泥的脱水性。结果首先表明，可以通过催化Fenton反应，与外部供应的铁盐类似地利用原生铁，以提高污泥的脱水性。
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