高温厌氧膨胀床反应器处理木薯酒精废水试验

Expanded Granular Sludge Bed Treating Cassava Ethanol Wastewater Under Thermophilic Condition

摘要:

实验考察了厌氧膨胀床反应器（EGSB）处理木薯酒精废水的启动、运行和基质产沼气转化特性.结果表明，高温EGSB反应器接种中温颗粒污泥，需20 d即可完成启动，反应器故障停运54d后进行二次启动的时间仅需10 d.EGSB适宜的有机负荷是10～14 kg·m-3·d-1（以COD计），稳定运行期间对化学需氧量（COD）的去除率在80%～90%之间，在标准状态下的产沼气转化率（BCR）为0.315 m3·kg-1.试验期间反应器内的污泥颗粒化程度良好，直径2 mm以上的大颗粒污泥增长迅速.260 d时污泥挥发性悬浮固体(VSS)与总固体（TSS）质量浓度之比ρVSS/ρTSS由接种时的0.51变为0.84.启动和运行期，出水pH值随着COD去除率的变化而波动，可以通过系统出水pH大小来初步判断EGSB的运行状况.

Abstract:

The research focuses on the characteristics of the start up, operation and methane production of the expanded granular sludge bed (EGSB) treating cassava ethanol wastewater. The results show that the start up of the EGSB reactor inoculated with mesophilic granular sludge needs only 20 days. The second start up needs only 10 days after 54 days’ shutdown. The optimal organic load rate range of EGSB is within 10~14 kg·m-3·d-1, and chemical oxygen demand (COD) removal rate maintains 80%~90% during the stable operation. The biogas conversion rate（BCR）of EGSB is 0.315 m3·kg-1 under standard temperature and pressure(STP) condition. It is found that the granulation of sludge in EGSB is good and the large granules with diameter more than 2 mm grow rapidly. The ρVSS/ρTSS ratio of sludge increases from 0.51 to 0.84 after 260 d test. The pH value of the effluent fluctuates with the COD removal rate of the system, and pH can be regarded as a primary indicator of EGSB operation condition.