单级自养脱氮颗粒污泥启动及其胞外聚合物性能

发布时间：2018-04-23 06:28

本文选题：单级自养脱氮 + 颗粒污泥　；参考：《中国给水排水》2016年19期

【摘要】：接种城市污水厂硝化污泥,采用模拟生活污水培养出单级自养脱氮颗粒污泥,脱氮率稳定在84.3%左右。在不同曝气量和进水总氮浓度的条件下,研究了接种硝化污泥和自养脱氮颗粒污泥中EPS的化学结构和组分变化及其对污泥沉降性能的影响,并分析了EPS与出水氮浓度之间的关系。结果表明:接种污泥中结合型EPS(BEPS)和溶解型EPS(SEPS)含量分别为82.28和17.91 mg/g VSS,自养脱氮颗粒污泥中BEPS和SEPS分别为112.72和7.83 mg/g VSS,后者BEPS所占比例较大,SEPS的含量较少。这是由于BEPS在颗粒污泥中相对稳定,并且低进水COD浓度造成颗粒污泥SEPS含量降低,从而使得颗粒污泥絮凝结合能力更好。接种污泥的EPS主要组分为多糖(70.83%),而成熟自养脱氮颗粒污泥的EPS主要成分为蛋白质(83.72%)。自养脱氮颗粒污泥的SVI为54.72 m L/g,泥水分离效果较好。SVI与EPS的相似变化趋势反映了EPS对自养脱氮颗粒污泥絮凝沉降的重要影响。
[Abstract]:The single stage autotrophic denitrification granular sludge was cultivated with simulated domestic sewage and the nitrogen removal rate was about 84.3% after inoculation with nitrified sludge from municipal sewage treatment plant. Under the conditions of different aeration rate and influent total nitrogen concentration, the chemical structure and composition of EPS in nitrifying sludge and autotrophic denitrification granular sludge and their effects on sludge settling performance were studied. The relationship between EPS and effluent nitrogen concentration was analyzed. The results showed that the contents of BEPS and SEPS in inoculated sludge were 82.28 and 17.91 mg/g / s, respectively, and the contents of BEPS and SEPS in autotrophic granular sludge were 112.72 and 7.83 mg/g, respectively. The content of BEPS in the latter was relatively small. This is due to the relative stability of BEPS in granular sludge and the decrease of SEPS content in granular sludge due to the low influent COD concentration, which makes the flocculating ability of granular sludge better. The main component of EPS inoculated sludge was polysaccharide 70.83%, while the main component of EPS of mature autotrophic nitrogen removal granular sludge was protein 83.72%. The SVI of autotrophic nitrogen removal granular sludge was 54.72 mL / g, and the similar trend between SVI and EPS reflected the important influence of EPS on flocculation settlement of autotrophic nitrogen removal granular sludge.
【作者单位】：武汉理工大学资源与环境工程学院;矿物资源加工与环境湖北省重点实验室;
【基金】：湖北省自然科学基金资助项目(2014CFB285) 武汉市应用基础研究计划项目(2014060101010065)
【分类号】：X703

【参考文献】