高温污泥厌氧消化器的启动

污泥厌氧消化是最常用的污泥减量化和稳定化技术,高温消化污泥稳定快,但我国缺乏启动和运行经验,故进行了高温厌氧消化器处理剩余活性污泥的中试启动试验.所采用的消化器为内循环消化器,它属于升流式反应器.依赖回流沼气控制反应器的水力状况.启动采用了分步适应的策略,促进厌氧细菌适应温度、反应器构型和处理对象的变化.主要措施有:启...

Start-Up of a Thermophilic Anaerobic Sludge Digester

Anaerobic digestion is one of the most widely-used technologies of the sludge reduction and stabilization, in which thermophilic digestion has advantage of fast stabilization. But it is lack of operation experience in China. Thus start-up of a thermophilic anaerobic sludge digester treating excess activated sludge was investigated. The digester was an internal circulation anaerobic sludge digester. It belongs to upflow reactor and its hydrodynamic conditions can be controlled by backflow biogas. A multistep strategy was applied to the start-up to enhance anaerobic bacteria to adapt the changes of temperature, reactor and treated sludge, including: to feed the digester with easily-degraded glucose to enhance bacteria reproduce at the first beginning with COD organic loading of 2.4 kg/(m³·d); to accelerate the internal circulation; to control pH within a optimal range; to gradually increase excess sludge flow rate as well as to initiate pydrohydrolysis to enhance hydrolysis. The start-up took 63 days and when it finished, the VSS organic loading reached 1.60 kg/(m³·d), the average VSS biogas rate was 0.51 L/g,i.e. 15.3 m³/m³ sludge (96% water content), VSS and SS removals were 60.8% and 45.8%. This shows that the strategy is valid.