电渗透/Fe-过硫酸盐氧化协同强化污泥深度脱水

摘要

Dewatered sewage sludge of sewage treatment plant was studied by self-made experimental device dewatering based on electro-osmotic-advanced oxidation process which would be influenced by the dosage of persulfate, proportion of ferric salt and persulfate, voltage gradient and the thickness of dewatered sewage sludge. The results showed that the combination of electro-osmosis-advanced oxidation technology can improve the dewater ability. The water content can be reduced to below 60% with sludge amount of 140 g, persulfate dosage of 100 mg·(g DS)−1, Fe2+/persulfate of 1:1, mechanical pressure of 17.59 kPa and controlling initial voltage of 11 V·cm−1. Electro-osmotic-advanced oxidation process can ensure fully use of oxidation ability of4SO−i to improve the sludge dewater ability based on the mechanism of reduction of electric field and electronic metastasis reaction, making persulfate fully activated compared with sludge dewatering by activated persulfate. Better than the traditional electro-osmosis sludge dewatering, more amount sludge can be treated one time and sludge cake uniformity can be highly improved for the subsequent transportation and settlement.%利用电渗透和高级氧化技术，采用自制实验装置对城市污水处理厂的脱水污泥进行了脱水研究，系统研究了过硫酸盐投加量、铁盐与过硫酸盐比例、电压梯度、脱水时间和污泥厚度对污泥脱水的影响。结果表明，电渗透-高级氧化复合技术可以改善污泥的脱水性能，在污泥样品为140 g、过硫酸盐投加量为100(mg·g DS)−1、Fe2+与过硫酸盐比例为1：1、机械压力为17.59 kPa、控制初始电压为11 V·cm−1时，污泥的含水率可以降低至60%以下，与单独使用电渗透技术相比，泥饼具有更好的均匀性，便于后续的运输和安置。