Liu Ji-bao, Ni Xiao-tang, Wei Yuan-song, Tong Juan, Wang Ya-wei
Huan Jing Ke Xue. 2014 Sep;35(9):3455-60.
To improve anaerobic digestion and dewatering of sludge, impacts of sludge pretreated by microwave (MW) and its combined processes on sludge anaerobic digestion and dewatering were investigated. The results showed that microwave and its combined processes could effectively enhance anaerobic sludge digestion. Not only the cumulative methane production in the test of the MW-H2O2-alkaline (0. 2) was increased by 13. 34% compared with the control, but also its methane production rate was much higher than that of the control. Compared with the single MW process, the addition of both H2O2 and alkaline enhanced the solubilization of particle COD( >0. 45 micron) , indicating that synergistically generated soluble organics were faster to biodegrade which resulted in the enhancement of anaerobic digestion. The MW-acid process was effective in improving sludge dewaterability, e. g. , Capillary Suction Time (CST) at only 9. 85 s. The improvement of sludge dewatering was significantly correlated with sludge physical properties such as zeta potential, surface charge density and particle size. Under different sludge pretreatment conditions, the sludge dewatering after anaerobic digestion was similar, though the difference of sludge dewatering to some degrees was observed for pretreated sludge.
为提高污泥的厌氧消化和脱水性能，研究了微波（MW）及其联合工艺预处理污泥对污泥厌氧消化和脱水的影响。结果表明，微波及其联合工艺能有效增强厌氧污泥消化。与对照组相比，MW-H2O2-碱性（0.2）试验中的累积甲烷产量不仅提高了13.34%，而且其甲烷产率也远高于对照组。与单一微波工艺相比，同时添加H2O2和碱增强了颗粒态化学需氧量（>0.45微米）的溶解，表明协同产生的可溶性有机物更易于生物降解，从而增强了厌氧消化。MW-酸工艺在改善污泥脱水性能方面效果显著，例如，毛细吸水时间（CST）仅为9.85秒。污泥脱水性能的改善与污泥的物理性质如ζ电位、表面电荷密度和粒径显著相关。在不同的污泥预处理条件下，厌氧消化后的污泥脱水情况相似，尽管预处理污泥在一定程度上存在脱水差异。
