两种不同运行方式下好氧颗粒污泥培养及污染物去除性能对比研究

为了解决单一负荷或逐步提高负荷下培养颗粒污泥所需时间较长、污染物去除不稳定的问题，本文提出采用交替改变进水碳氮负荷方式，研究好氧颗粒污泥(AGS)形成过程及污染物去除效果。通过设计进水/曝气/沉淀/排水（S1反应器）和进水/曝气/停曝/曝气/停曝/曝气/沉淀/排水（S2反应器）两种运行方式培养好氧颗粒污泥，对比分析颗粒污泥形成过程中污泥形态变化、污泥沉降性能及对污染物去除情况。结果表明，S1反应器在第84天、S2反应器在第78天均可形成平均粒径为0.5mm的颗粒污泥，第115d时两个反应器内颗粒污泥的平均粒径分别为0.85mm、0.97mm。S1、S2反应器内的MLSS、SVI的质量浓度分别达到了4.94g/L-1、5.895g·L-1和80mL/g、46mL/g，S2运行方式下，形成的颗粒污泥更有利于微生物的生长，使反应器内维持较高的生物量且沉降性能更优。两种运行模式下COD、NH4+-N的去除效果变化甚微，TN、PO43--P去除效果差异较明显。S1运行方式下COD、NH4+-N、TN、PO43--P去除率分别为90.0%、99.7%、74.5%和85.0%，S2运行方式下COD、NH4+-N、TN、PO43--P去除率分别为94.0%、99.9%、94.4%和95.0%，与前者相比COD、NH4+-N、TN、PO43--P去除率分别增加了4.0%、0.2%、19.9%和10.0%。因此，进水碳氮负荷同步交替变化-进水/曝气/停曝/曝气/停曝/曝气/沉淀/排水方式可在更短的时间内培养出粒径更大、污染物去除性能更优的好氧颗粒污泥。

Comparative Study on the Aerobic Granular Sludge Cultivation and Pollutant Removal Under Two Different Operation Modes

To solve the problem that it takes a long time to cultivate granular sludge under single load or gradually increasing load and the removal of pollutants is unstable. An alternative change of influent carbon-nitrogen loading is proposed to study the formation process of aerobic granular sludge (AGS) and the removal effect of pollutants.Cultivated AGS by influent / aeration / precipitation / drainage(S1) and influent / aeration / aeration / aeration / aeration / sedimentation / drainage(S2), and the morphological changes, sedimentation performance and pollutant removal situation during the formation of granular sludge were compared and analyzed. Results showed that the average particle size of the reactor(S1) was 0.5mm on Day 84 and the reactor (S2) on Day 78. At the Day 115, the average particle size of the sludge in two reactors was 0.85mm and 0.97mm.S1 and S2 mass concentration of the MLSS and SVI in the reactor reached 4.94g/L-1,5.895g/L-1 and 80mL/g,46mL/g,mature AGS was more conducive to the growth of microorganisms, maintained higher biomass and sedimentation performance.The removal effect of COD and NH4+-N under two operating modes changed slightly, and the removal effect of TN and PO43--P was significantly different. The removal rates of COD, NH4+-N, TN, and PO43--P in S1 operation mode are 90.0%, 99.7%, 74.5% and 85.0%, while are 94.0%, 99.9%, 94.35%, 95.0% in S2, and 4.0%, 0.2%, 19.9% and 10.0% higher than that in S1. The aerobic granular sludge with larger particle size and better pollutant removal performance Could be cultivated in reactor (S2)With Intermittent aeration.