School of Environment and Civil Engineering, Jiangnan University, Wuxi 214122, China.
J Environ Sci (China). 2013 Oct 1;25(10):2031-40. doi: 10.1016/s1001-0742(12)60268-x.
Two identical full-scale biogas-lift reactors treating brewery wastewater were inoculated with different types of sludge to compare their operational conditions, sludge characteristics, and kinetic models at a mesophilic temperature. One reactor (R1) started up with anaerobic granular sludge in 12 weeks and obtained a continuously average organic loading rate (OLR) of 7.4 kg chemical oxygen demand (COD)/(m3 x day), COD removal efficiency of 80%, and effluent COD of 450 mg/L. The other reactor (R2) started up with residual activated sludge in 30 weeks and granulation accomplished when the reactor reached an average OLR of 8.3 kg COD/(m3 x day), COD removal efficiency of 90%, and effluent COD of 240 mg/L. Differences in sludge characteristics, biogas compositions, and biogas-lift processes may be accounted for the superior efficiency of the treatment performance of R2 over R1. Grau second-order and modified StoverKincannon models based on influent and effluent concentrations as well as hydraulic retention time were successfully used to develop kinetic parameters of the experimental data with high correlation coefficients (R2 > 0.95), which further showed that R2 had higher treatment performance than R1. These results demonstrated that residual activated sludge could be used effectively instead of anaerobic granular sludge despite the need for a longer time.
两个相同规模的沼气提升式反应器采用不同类型的污泥接种，在中温条件下比较其运行条件、污泥特性和动力学模型。一个反应器（R1）在 12 周内用厌氧颗粒污泥启动，获得了 7.4kg 化学需氧量（COD）/（m3 x 天）的连续平均有机负荷率（OLR），COD 去除率为 80%，出水 COD 为 450mg/L。另一个反应器（R2）在 30 周内用剩余活性污泥启动，当反应器达到平均 OLR 为 8.3kg COD/（m3 x 天）时，完成了颗粒化，COD 去除率为 90%，出水 COD 为 240mg/L。污泥特性、沼气成分和沼气提升过程的差异可能是 R2 处理性能优于 R1 的原因。基于进水和出水浓度以及水力停留时间的 Grau 二级和修正的 Stover-Kincannon 模型成功地用于开发实验数据的动力学参数，具有较高的相关系数（R2 > 0.95），进一步表明 R2 具有比 R1 更高的处理性能。这些结果表明，尽管需要更长的时间，但剩余活性污泥可以有效地替代厌氧颗粒污泥。
