连续流态下以实际低基质生活污水培养好氧颗粒污泥及其脱氮性能

研究了连续流系统污泥颗粒化过程中COD、氨氮和TN的去除效果以及成熟好氧颗粒污泥的物理性质和脱氮动力学.结果表明40 d内连续流系统内能形成好氧颗粒污泥.随着颗粒化程度的提高,系统脱氮除碳性能有所增加;第41~60 d稳定运行期间,系统对COD、氨氮和TN的平均去除率分别到达到85.54%、95.5%和65.56%,且反应过程中硝酸盐氮和亚硝酸盐氮的积累不高.成熟颗粒污泥有较多的空隙结构,含有大量的胞外聚合物,相比于接种絮状污泥,其含水率、湿密度、沉降速度、机械强度、SVI值等都体现出了明显的优势.成熟好氧颗粒污泥同步硝化反硝化效率为81.69%,硝化速率(以NH+4-N计)和反硝化速率(以NO-x-N计)分别为5.78 mg·(L·h)-1和4.90 mg·(L·h)-1.

Cultivation of Aerobic Granular Sludge with Real Low Concentration Domestic Wastewater and Its Denitrification Performances Under the Continuous Flow

The COD, ammonia and total nitrogen removal efficiency, as well as the physical properties of aerobic granular sludge (AGS) and its denitrification kinetics were studied in the continuous flow reactor. The experimental results showed that the AGS was successfully cultivated in the continuous flow system within 40 days. The nitrogen and carbon removal efficiencies were gradually improved with the improvement of sludge granulation. In the running stage of 41-60 days, the COD, ammonia and TN removal efficiency could reach 85.54%, 95.5% and 65.56%, respectively. And the nitrate and nitrite nitrogen accumulation was not high in the reaction process. Mature AGS had more void structure and a large number of extracellular polymeric substances. It had significant advantages compared with the seed sludge in the aspects of moisture content, wet density, sedimentation rate, mechanical strength, and SVI values. The simultaneous nitrification and denitrification efficiency was 81.69%, the nitrification rate and denitrification rate were 5.78 mg ·(L ·h)^-1 and 4.90 mg ·(L ·h)^-1, respectively.