UASB反应器处理链霉素废水启动及运行性能

采用上流式厌氧污泥床(UASB)反应器处理链霉素生产废水,研究了中温条件下反应器启动和稳定运行中废水处理性能及厌氧污泥颗粒化过程。结果表明,通过逐步提高链霉素废水进水比例和负荷,可以实现UASB反应器的启动和稳定运行,并对高浓度链霉素实际废水具有良好的处理性能,COD去除率稳定在80%以上,COD去除负荷达7.2 kg/(m3·d),CH4产生量达到6.2 L/d。UASB反应器启动运行过程中,链霉素废水对污泥活性具有抑制影响,造成短期反应器运行性能明显下降,而后很快恢复。同时高负荷链霉素废水造成甲烷产率降低。污泥性状变化显著,污泥形态逐渐转变为颗粒态,污泥粒径增大,出现大量0.5~1.0 mm颗粒污泥,污泥VSS/SS比值升高,污泥沉降性明显增强,比产甲烷活性显著升高,表明污泥开始实现颗粒化。

Start-up and performance of UASB reactor treating streptomycin wastewater

The start-up and performance of a mesophilic up-flow anaerobic sludge blanket (UASB) reactor used to treat streptomycin wastewater were investigated and the sludge granulation during start-up and stable operation of the reactor was also explored. The results indicated that the successful start-up and the stable operation of the UASB reactor could be realized by increasing the ratio and organic loading rate (OLR) of streptomycin wastewater in the influent. The COD removal rate was above 80%, and the OLR removed and the methane production reached up to 7.2 kg/(m³·d) and 6.2 L/d, respectively, indicating the efficient and stable treatment of high-strength streptomycin wastewater in the UASB reactor. The streptomycin wastewater showed the inhibition effect on sludge bioactivity during the reactor start-up, resulting in short-term performance deterioration of the reactor, then recovered soon. The decreased methane yield was also observed at high OLR of streptomycin wastewater. The sludge characteristics varied greatly during start-up and stable operation of the reactor. The inoculated flocculent sludge transformed to granular sludge gradually. The sludge diameter, sludge VSS/SS ratio and sludge settleability increased. A large amount of granular sludge with diameter of 0.5~1.0 mm emerged. The specific methanogenic activity also increased significantly. These results showed sludge granulation happened.