CSTR反应器处理白酒酒糟的启动研究

Study of CSTR Reactor Starting on Distillers Grains Wastewater Treatment

关键词:  酒糟  半分批式  日产气量

Key words:  distillers grains  semi-batch start  daily biogas yield

摘要:

在中温条件(35℃)下,利用CSTR厌氧反应器半分批式启动处理白酒酒糟,对启动过程的工艺参数(如pH值,VFA等)进行研究。结果,CSTR反应器采用初始物料低容积负荷1.0kgVS/(m³·d),并以负荷0.5kg VS/(m³·d)逐增的方式启动,当容积负荷在1.0~2.5kg VS/(m³·d)范围,厌氧系统单位容积日产气量基本保持在1.45L/(L·d)以上,甲烷含量稳定在60%左右,pH值稳定在6.9~7.3,VFA稳定在1000mg/L左右,COD去除率稳定在78.7%~93.7%。研究提高了糟渣的利用率及沼气产量,降低了反应器启动的成本,具有经济可行性。

Abstract:

In mesophilic temperature conditions (35℃), full-mix anaerobic digestion reactor CSTR(continuous stirred tank reactor) was used to treat distillers grains by semi-batch start, of which the parameters of start-up processing (such as pH, VFA, etc.) were studied. The results show that the CSTR reactor was started with low initial material volume load of 1.0kg VS/(m³·d) and gradually increased by the rate of 0.5kg VS/(m³·d). When the range of volume load was 1.0 to 2.5kg VS/(m³·d), the daily biogas yield per unit volume kept in more than 1.45L/(L·d), the content of methane stabilized at around 60%, pH value was stable at 6.9 to 7.3, VFA value stably kept in the vicinity of 1000mg/L and COD removal was stable at 78.7% to 93.7%.This study improved the utilization of distillers grains and biogas production, and reduced production costs of start-up processing, which might be feasible in economics.