Wang Youzhao, Pan Yuan, Li Xianjin, Zhang Kuo, Zhu Tong
School of Mechanical Engineering and Automation, Northeastern University Shenyang 110004 China.
RSC Adv. 2018 Dec 17;8(73):42032-42040. doi: 10.1039/c8ra08726a. eCollection 2018 Dec 12.
This study proposed a sludge degradation system comprised of: (i) an ultrasound treatment (UT) system to disintegrate sludge; (ii) an up flow anaerobic sludge blanket (UASB) reactor to degrade the disintegrated sludge; and (iii) a microbial electrolysis cell (MEC) in replacement of a three-phase UASB separator to deeply degrade the disintegrated sludge. The influence of the ultrasound power, the temperature, and the voltage on the sludge degradation process was discussed. The experimental results showed that the UT unit effectively promoted sludge disintegration, thereby leading to deterioration of the quality of the reactor effluent. The temperature and the voltage parameters were found to be key for the anaerobic degradation (AD) process within this system. The volatile suspended solid concentration in the effluent was maintained at 320-380 mg L ( 0.08 times the raw sludge concentration), thereby validating the utilization of MEC as a three-phase separation unit. The total chemical oxygen demand removal was maintained at 61.3% during 5 days of AD upon intermittent exposure of the sludge to the UT unit, thereby showing that the system can effectively degrade solid organic matter. The bacterial community structure of the raw sludge significantly changed, with the high biodiversity of this system increasing the ecological stability. This system can degrade sludge with high efficiency and could be used in further engineering applications.
本研究提出了一种污泥降解系统，该系统包括：(i) 用于分解污泥的超声处理（UT）系统；(ii) 用于降解分解后的污泥的上流式厌氧污泥床（UASB）反应器；以及(iii) 用于替代三相UASB分离器以深度降解分解后的污泥的微生物电解池（MEC）。讨论了超声功率、温度和电压对污泥降解过程的影响。实验结果表明，UT单元有效地促进了污泥分解，从而导致反应器出水水质恶化。发现温度和电压参数是该系统中厌氧降解（AD）过程的关键。出水的挥发性悬浮固体浓度保持在320 - 380 mg/L（为原污泥浓度的0.08倍），从而验证了MEC作为三相分离单元的实用性。在污泥间歇暴露于UT单元的情况下，AD的5天期间总化学需氧量去除率保持在61.3%，从而表明该系统能够有效降解固体有机物。原污泥的细菌群落结构发生了显著变化，该系统的高生物多样性提高了生态稳定性。该系统能够高效降解污泥，可用于进一步的工程应用。
