ATAD污泥减量稳定化技术研究

The technique of ATAD sludge reduction and stabilization

自热高温好氧消化(auto-heated thermophilic aerobic digestion,ATAD)技术是近年来备受关注的污泥稳定和减量技术,在好氧环境条件下,微生物通过自身的放热反应,将部分热量用以补充系统的能量消耗,其余热量用于提高反应系统的温度,可以达到高温好氧消化污泥的目的。实验采用自行设计的自热高温好氧消化(ATAD)反应器,以西安北石桥污水净化中心的脱水污泥为源泥,采用间歇式反应模式运行,通过改变运行参数,在不同工况下连续检测污泥的VSS、总磷、总氮、氨氮、泥温、COD等指标,确定了系统最佳运行条件为:进泥质量分数5%～8%、曝气量0.4～0.8 L/min、机械搅拌强度120 r/min。按此条件运行,污泥温度可自动升至48℃、VSS的去除率达到40.2%、DHA下降率为94.33%,达到高效灭菌、污泥趋于稳定的目的,但处理后污泥脱水性能变差。

The autothermal thermophilie aerobic digestion process is the most concerned sludge stabilization and reduction technique during these days. Under the aerobic conditions, by the own exothermic reaction of micro - organisms, some parts of heat are using as the supplement of the system energy consumption, others are using to increase the reaction temperature for high -temperature reaction environment. The autothermal thermophilie aerobic digestion （ATAD） reactor used in this research is designed by ourselves and the dewatered sludge of Xi＇ an Beishiqiao wastewater treatment center is as the source. With its intermittent reaction mode , by changing the operating parameters and continuously monitoring VSS, total phosphorus, total nitrogen, ammonia nitrogen, soil tempera- ture, COD and other indicators of sludge, the optimum operating parameters are determined as follows ： the concentration of input sludge is 5% - 8%, the aeration rate is 0.4 L/min to 0.8 L/min, the stirring rate is 120 r/min. Under these conditions, the temperature of sludge could be automatically raised to 48 ℃ , the removal rate of VSS is 40.2% and the decreasing rate of DHA is 94.33%, which could obtain the purpose of disinfection and stabilization, but the dewatering behavior of sludge is declined.