Reversibility of the structure and dewaterability of anaerobic digested sludge
Reversibility of the structure and dewaterability of anaerobic digested sludge
复制标题
厌氧消化污泥结构的可逆性和脱水性
DOI：
10.1016/j.jes.2015.08.004
复制
发表时间：
2016
影响因子：
6.9
通讯作者：
Xiaoxiu Lun
中科院分区：
文献类型：
--
作者：
Yiqi Sheng;Yili Wang;Wei Hu;Xu Qian;Huaili Zheng;Xiaoxiu Lun
The reversibility of the structure and dewaterability of broken anaerobic digested sludge (ADS) is important to ensure the efficiency of sludge treatment or management processes. This study investigated the effect of continuous strong shear (CSS) and multipulse shear (MPS) on the zeta potential, size (median size,d50), mass fractal dimension (DF), and capillary suction time (CST) of ADS aggregates. Moreover, the self-regrowth (SR) of broken ADS aggregates during slow mixing was also analyzed. The results show that raw ADS withd50of 56.5 μm was insensitive to CSS–SR or MPS–SR, though the size slightly decreased after the breakage phase. For conditioned ADS withd50larger than 600 μm, the breakage in small-scale surface erosion changed to large-scale fragmentation as the CSS strength increased. In most cases, after CSS or MPS, the broken ADS had a relatively more compact structure than before andd50is at least 200 μm. The CST of the broken fragments from optimally dosed ADS increased, whereas that corresponding to overdosed ADS decreased. MPS treatment resulted in larger and more compact broken ADS fragments with a lower CST value than CSS. During the subsequent slow mixing, the broken ADS aggregates did not recover their charge, size, and dewaterability to the initial values before breakage. In addition, less than 15% self-regrowth in terms of percentage of the regrowth factor was observed in broken ADS after CSS at average velocity gradient no less than 1905.6 sec− 1.
