高氨氮对连续流状态下好氧颗粒污泥稳定性的影响

Stability of Aerobic Granular Sludge in a Continuous Flow Reactor with High Ammonia Nitrogen Concentration

接种SBR中培养成熟的好氧颗粒污泥(AGS),研究高氨氮、连续流环境下AGS的稳定性维持。在63 d的运行过程中,随着每次进水氨氮浓度(200~275 mg/L)的提高,AGS的理化特性及对污染物的去除率均会出现波动。运行过程中AGS的颜色逐渐变深,15~45 d内观察到部分大颗粒出现解体并导致了MLSS的减小,但AGS一直保持着较好的沉降性能(SVI一般小于70m L/g)。相比于接种AGS,试验结束时的AGS变得更加光滑、致密。随着AGS逐渐适应进水水质,对COD及TP的去除率最终分别接近90%及100%。反应器对TIN的去除效果并不理想且不稳定(去除率为50%~90%),出水中残留有大量氨氮(在30~90 mg/L之间)。虽然逐渐升高的氮负荷[0.8~1.1 kg/(m^3·d)]对AGS的稳定性有一定冲击,但AGS通过形态及理化特性的调节逐步适应了新环境,表明高氨氮、连续流环境下AGS可较好地维持其稳定性。

Inoculated with mature ty maintenance of AGS was investigated aerobic granular sludge （AGS） cultivated in a SBR, the stabili- under high ammonia nitrogen concentration and continuous flow environment. During the 63 days operation, physicochemical properties and pollutants removal rates of AGS would fluctuate whenever influent ammonia nitrogen increased （200 to 275 mg/L）. The color of the AGS progressively got deeper during the operation. Disintegration of part of the larger granules was observed within 15 to 45 d, which led to the decrease of MLSS, however, good settleability of AGS was always maintained （SVI of less than 70 mL/g）. Compared with inoculated AGS, the AGS obtained at the end of the experiment became more smooth and denser. With AGS gradually adapted to the influent quality, the removal rates of COD and TP were eventually close to 90% and 100%, respectively. The removal rate of TIN was not good and unstable （ removal rate of 50% to 90% ）, which was characterized by a lot of ammonia nitrogen resided in the effluent （about 30 to 90 mg/L）. Although the stability of AGS was impacted by the increase of nitrogen loading rate [ 0.8 to 1.1 kg/（ m^3 · d） ], but AGS gradually adapted to the new environment by adjusting morphology and physicochemical properties, which indicated that AGS could be stable under high ammonia nitrogen concentration and continuous flow environment.