敏化剂特性及其耦合微波强化污泥破解研究

Sensitizer characteristics and its enhancement performance to sludge decomposition associated with microwave

采用污泥活性炭(SAC)、TiO2/SAC、Fe3O4/SAC作为敏化剂,结合微波处理技术对污泥进行了预处理,通过分析滤液中COD、DNA、氮、磷、有机物的含量及组分,探索微波+敏化剂的最佳处理条件.SAC负载TiO2和Fe3O4后强化了其对电磁波的介电损耗和磁滞损耗,tanδε分别增加了1.8和1.3倍,tanδμ分别增加到0.26和0.67.TiO2/SAC投加量为0.25g/gSS时,样品滤液的COD浓度是1900mg/L,是原污泥和单独微波处理的4.52倍和1.86倍;Fe3O4/SAC投加量为0.35g/gSS时,样品滤液的COD浓度是2540mg/L,是原污泥和单独微波处理的6.05倍和2.45倍,Fe3O4/SAC强化污泥破壁效果更好.此时,样品滤液中TN、TP、蛋白质、多糖浓度分别为原污泥的7.7倍、16倍、7.49倍和71.69倍,微生物胞内和胞外聚合物中的物质大量释放,滤液中的溶解性有机物大大增加.微波+敏化剂的预处理方法有利于对污泥中氮、磷及有机物进行资源化利用与回收.

Sludge activated carbon(SAC),TiO2/SAC and Fe3O4/SAC were used as the sensitizers to enhance the decomposition of excess sludge associated with microwave.Based on the analysis of chemical oxygen demand(COD),DNA,nitrogen,phosphorus and organic matters from the filtrate,the optimal conditions were investigated.After loading TiO2 and Fe3O4 on SAC,the dielectric loss and hysteresis loss of electromagnetic wave were enhanced.When the dosage of TiO2/SAC was 0.25g/gSS,the filtrate COD concentration was 1900mg/L,which increased by factors of 4.52 and 1.86 to the excess sludge and sludge treated by microwave,however,the addition of Fe3O4 is more conducive to the decomposition of excess sludge,the filtrate COD content was up to 2540mg/L,which was 6.05 times and 2.45 times higher than that of excess sludge and sludge treated by microwave.In addition,the filtrate total phosphorus(TP),total nitrogen(TN),protein and polysaccharides concentrations increased by factors of 7.7,16,7.49 and 71.69,indicating that a large amount of intracellular and extracellular polymeric substances released to filtrate and further greatly increased the soluble content of organic matters.The pretreatment method of microwave+sensitizer is beneficial to resource utilization and recovery of nitrogen,phosphorus and organic matters in excess sludge.