分段组合式厌氧反应器预警性能

Performance of early-warning of compartmentalized anaerobic reactor

摘要:

采用模拟有机废水，研究了分段组合式厌氧反应器 (Compartmentalized anaerobic reactor，CAR) 的预警性能。试验结果表明：高效厌氧反应器的运行稳定性低于常效厌氧反应器。在高效工况下，进水的化学需氧量 (Chemical oxygen demand，COD) 浓度的小幅提升 (平均相对标准偏差为8.08％) 可引起出水COD浓度 (平均相对标准偏差为32.95％) 和出水挥发性脂肪酸 (Volatile fatty acids，VFA) 浓度 (平均相对标准偏差为40.46％) 的大幅增加。容积负荷饱和度和VFA饱和度与反应器工况密切相关，可用于厌氧反应过程的预警。常负荷工况下 (容积负荷饱和度和VFA饱和度低于0.89与0.40)，反应运行性能稳定；满负荷工况下 (容积负荷饱和度和VFA饱和度趋近1)，反应运行性能波动增大；超负荷工况下 (容积负荷饱和度和VFA饱和度超过1)，反应运行性能恶化。

Abstract:

Early-warning of compartmentalized anaerobic reactor (CAR) was investigated in lab-scale. The performance stability of CAR at high loading rate was worse than that at common loading rate. At high loading rate, the fluctuation of effluent chemical oxygen demand (COD) concentration and volatile fatty acids (VFA) concentration was larger than that of influent COD concentration. The average relative standard deviation of effluent COD concentration and VFA concentration was 32.95% and 40.46% respectively, while that of influent COD concentration was 8.08%. The saturation of volumetric loading rate (SVLR) and VFA (SVFA) could be used to alarm the performance of anaerobic reactors. The working performance was good when the CAR was operated at normal organic loading rate (OLR), in which SVLR and SVFA were below 0.89 and 0.40 respectively. The fluctuation of performance became larger when the CAR was operated at OLR near saturation, in which SVLR and SVFA were close to 1. The performance of CAR was deteriorated when the SVLR and SVFA were more than 1.