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| Study on the influence of ultrasonic technology on sludge earthworm composting |
| ZHENG Xi-peng1, CAO Zhou-rong2, CHEN Yu3, YANG Shun-sheng1 |
1. School of Civil Engineering, Southwest Jiaotong University, Chengdu 610031, China;
2. Chengdu Xingrong Environmental Co., Ltd, Chengdu 610040, China;
3. Southwest Jiaotong University, Faculty of Geosciences and Environmental, Chengdu 610031, China |
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Abstract 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.
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Received: 10 September 2018
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