内循环UASB处理酒精废水及其颗粒污泥特性

Treatment of Alcohol Wastewater Using Internal Circulation UASB and Characteristics of Granular Sludge

针对传统UASB反应器在启动时颗粒污泥形成缓慢的问题,采用内循环UASB反应器作为厌氧单元对酒精废水进行处理。其以低负荷启动,启动完成后容积负荷为7.9 kg/(m3.d),对COD的去除率可达80%,整个试验阶段对NH3-N的平均去除率为16.38%。扫描电镜显示颗粒污泥中的优势菌开始为短杆菌,随着培养时间的延长则出现了球菌;而现有UASB反应器中颗粒污泥的优势菌为丝状菌。对沼气成分进行分析,CH4含量最高为81.61%,N2含量则随着颗粒污泥培养时间的延长由3.68%增加至18.59%。

Due to slow formation of granular sludge during start-up of the traditional UASB reactor, internal circulation UASB reactor, as an anaerobic unit, was adopted to treat alcohol wastewater. The internal circulation UASB reactor was started at low loading rate. The removal rate of COD reached 80% when the volumetric loading was 7.9 kg/（ m3 · d） after a successful start-up. The average removal rate of NH3 - N was 16.38% during the entire testing process. Scanning electron microscopy results showed that the dominant bacteria in anaerobic granular sludge were Brevibacterium at first, while the proportion of cocci increased as incubation progressed. However, the dominant bacteria in granular sludge in the original UASB were filamentous bacteria. Biogas composition analysis showed that CH4 content was up to 81.61% , and N2 content increased from 3.68% to 18.59% with the extension of granular sludge incubation time.