基于磷酸盐还原工艺的解体污泥活性恢复研究

The Activities Recovered of Disintegrated Sludge Based on Phosphate Reduction Technology

目的探究导致磷酸盐还原污泥解体的原因和恢复方法,为进一步研究磷酸盐还原污泥的特性及系统恢复提供借鉴.方法在进行解体污泥恢复试验之前一次性加入助凝剂硫酸亚铁,维持3d后,通过3组试验进行解体污泥的恢复研究.3组方案分别通过改善环境pH值、营养物质比例以及温度,考察恢复过程中污泥性质和水质指标的变化,并对这些变化进行分析.结果加入硫酸亚铁后,反应器内污泥污泥膨胀指数(SVI)迅速降低,但维持到第2天后SVI值再次升高甚至超过初始状态.在进行污泥活性恢复的3组试验中,第Ⅰ组调整pH值,经过30 d的运行,SVI值依然超出污泥膨胀限值的0.66倍,水处理效率依然较差.第Ⅱ组调整营养比例,在22 d内污泥解体现象得到缓解,但污泥活性尚未恢复.第Ⅲ组调整温度,系统到运行20 d,污泥趋于稳定,处理效率得到明显提升,污泥解体现象得以解决.结论硫酸亚铁可以短时间缓解污泥解体现象,但不能从根本上解决污泥解体问题.污泥解体是由于温度改变造成的,pH值和营养比例不是造成污泥解体的主要原因,调节温度至理想条件是恢复污泥解体活性的最佳方法.

This paper aims to exploration the reason and recovering method of the disintegrated sludge of phosphate reduction technology,f or further study the properties of phosphate reduction and its system recovery. Before the disintegrated sludge recovered test,certain amount of the coagulant ferrous sulfate was added to maintain three days. The recovery of disintegrated sludge was carried out by three groups of experiments. Three groups were selected by improving the environmental pH, the proportion of nutrients and the temperature. During the recovery process, the changes in sludge property and water quality indicator were examined and analyzed. As a result,afteradding ferrisulfas, the SVI value in the reactor is rapidly reduced,but after the second day, the SVI value increases again or even beyond the initial state. In the 3 groups of experiments,after adjusting the pH value in the first group, the SVI still exceeds 0. 66 times of the sludge bulking limit after 30 d of operation,and the water treatment efficiency is still poor. After adjusting the ratio of the nutrients in the second group, the disintegration of the sludge has been alleviated in 22 days,but the activity of sludge has not yet been restored. In the third group,after raising the temperature, the sludge characteristics tend to keep constant after 20 d of operation,and the efficiency is significantly improved. The disintegrated sludge has been effectively controlled. So, the ferrisulfas can relieve the problem of disintegrated sludge,but it cannot fundamentally solve the problem of sludge disintegration.The disintegration of the sludge was caused by temperature change. The pH value and the nutrient ratio are not the main reasons for the disintegration of the sludge. The best method to restore the activity of the disintegration sludge is to adjust the temperature to the ideal condition.