高温CSTR-中温UASB两级厌氧处理木薯酒精废水

摘要

Since cassava ethanol wastewater is characterized by high temperature,high solid content and high organism concentration,the two-stage anaerobic treatment using thermophilic continuous stirred tank reactor (CSTR)and mesophilic upflow anaerobic sludge bed (UASB) has been conducted. Experimental results show that when the influent COD loading of thermophilic CSTR is controlled 14 kg/(m3·d) and COD loading of mesophilic UASB reactor is controlled 3 kg/(m3·d) ,the total removal rates of COD,SS,TN and TP are 94％ ,96％ ,44％ and 87％ ,respectively, after the two-stage anaerobic treatment.The life cycle of cassava ethanol production and economic benefits of such wastewater treatment are discussed,indicating that two-stage anaerobic treatment process can not only reduce the pollution resulted from cassava ethanol production, but also create economic benefits from the biogas produced in the course of treatment.%针对木薯酒精废水温度、固体含量及有机物浓度高的特点,采用高温CSTR-中温UASB两级厌氧工艺处理木薯酒精废水.小试结果表明,控制高温CSTR进水COD负荷为14 kg/(m3·d),中温UASB COD负荷为3 kg/(m3·d)时,两级厌氧对COD、SS、溶解性TN、溶解性TP的总去除率分别达94%、96%、44%和87%.对木薯酒精生产周期和废水处理经济效益的分析表明,采用两级厌氧工艺处理木薯酒精废水,不仅削减了木薯酒精生产过程中产生的污染物,其处理过程中产生的沼气还带来了一定的经济效益.