The combination of technologies including ultrasonic disintegration, aerobic composting and earthworm treatment was used to dispose the residual sludge of wastewater treatment plant in order to evaluate the effect of ultrasonic pretreatment on the degradation of organic matter and heavy metals. The results showed that the ultrasonic pretreatment technology had synergistic effect on the degree of sludge humification. The optimal TOC value of kinetic constant was 0.0084d-1, which was 2.1times higher than that of the control group. The average growth rates of humic acid and HA/FA were 97.4% and 191.5%, respectively, which were 1.26and 1.37 times higher than that of the control group. Meanwhile, it has a mitigating effect on the heavy metals accumulation in earthworm treatment stage and no significant effect on the heavy metals speciation in other stages. At the end of vermicomposting, the average proportion of non-steady state of heavy metals (Zn, Cu, Pb, Ni, Cd, Cr, Hg, As) decreased by 28.3%, 29.5%, 29.1%, 35.2%, 3.3%, 25.3%, 36.4%, 21.9% compared with at the end of the aerobic composting stage, respectively.
郑西朋, 曹洲榕, 陈钰, 杨顺生. 超声波对污泥蚯蚓堆肥有机质和重金属的影响[J]. 中国环境科学, 2019, 39(4): 1654-1663.
ZHENG Xi-peng, CAO Zhou-rong, CHEN Yu, YANG Shun-sheng. Study on the influence of ultrasonic technology on sludge earthworm composting. CHINA ENVIRONMENTAL SCIENCECE, 2019, 39(4): 1654-1663.
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