摘要
以厌氧絮状污泥接种,投加少量颗粒活性炭(GAC),处理高浓度自配水的上流式厌氧生物反应器在无沼气循环下,经18天运行即实现了污泥颗粒化,按反应区容积计算的有机负荷(OLR)达到15 kgCOD.m-3d-1,COD去除率为87%;启动沼气循环,在气体上升流速约2.1 m.h-1的条件下,几乎所有颗粒污泥在2天内发生解体;但继续沼气循环,经过在OLR约为36 kgCOD.m-3d-1下连续运行49天反应器内又重新形成了颗粒污泥;随后,反应器的OLR迅速提高到并保持在90 kgCOD.m-3d-1左右,稳定运行18天,COD去除率在95%以上;沼气循环可强化反应器内的混合程度,使其离散系数D达到0.368。
The pedonnance of a lab-scale anaerobic granular sludge bed reactor with biogas recirculation treating synthetic wastewater was investigated in this paper. Without biogas recirculation, the sludge granulation was achieved within 18 days in this up-flow anaerobic bio-reaetor, which was seeded with anaerobic floeeulent sludge together with some granular activated carbon （GAC）, the organic loading rate （OLR） of 15 kg COD·m^-3d^-1（based on the volume of reaction zone） and the COD removal efficiency of over 85% were achieved respectively. After the start of biogas reeireulation with a gas up-flow velocity of about 2.1m·h^-1, almost all granular sludge in the reactor was broken within 2 days, but the sludge re-granulation was achieved again within the following 49 days while keeping the OLR of 36 kgCOD·m^-3d^-1. Thereafter, the OLR was rapidly increased to and maintained at about 90 kgCOD·m^-3d^-1 and the COD removal efficiency was steadily over 95%. The biogas recirculation could enhance the mass tnmsfer rate in the bulk liquid in the reactor, and the dispersion coefficient D in the reactor was as high as 0.368.
出处
《中国沼气》
2006年第3期6-10,共5页
China Biogas
基金
国家"863"计划课题(2002AA601190)
关键词
沼气循环
厌氧生物反应器
厌氧颗粒污泥
颗粒活性炭
biogas recirculation
anaerobic bio-reactor
anaerobic granular sludge
granular activated carbon
