内循环厌氧反应器的污泥颗粒化过程

污泥颗粒化是高效厌氧反应器的核心技术。为准确掌握反应器的颗粒化规律,定量研究了内循环厌氧反应器中以颗粒污泥碎片为核的污泥颗粒化过程。在文中试验条件下,第48d污泥颗粒化程度(SGR)达到73%,大大缩短了颗粒化时间,且该段时间内SGR的对数与颗粒化时间线性相关性良好。试验结果表明,较高的有机负荷及其产生的较高的水力剪切力有利于污泥的颗粒化过程;若无干扰,颗粒化过程可按照对数颗粒化期、减速颗粒化期和稳定期3个阶段进行。

Sludge granulation with nuclei in an internal circulation anaerobic reactor

Granulation is the core technology in high-speed anaerobic reactors.To control accurately the granulation level,the granulation with granule fragments as nuclei in an internal circulation anaerobic reactor is investigated with quantitative method.The sludge granulation rate(SGR)takes 48 days to increase to 73%,which indicates the granulation is significantly enhanced.Furthermore,the logarithm of SGR during the first 48 days linearly correlates to the granulation time.The results show that high organic loading and high hydrodynamic shear force can accelerate granulation.Without ambient disturbance,the granulation will follow three steps including logarithmic period,decelerating period,and stabilization period.