有机碳源缺乏对成熟好氧颗粒污泥性能的影响

通过探究有机碳源缺乏废水对成熟好氧颗粒污泥物化特性、细菌活性、胞外聚合物(extracelluler polymer substances, EPS)及结构稳定性的影响,研究实际污水处理过程中缺乏有机碳源对好氧颗粒污泥稳定性及硝化活性的影响,进而检测实际污水处理中好氧颗粒污泥的耐冲击能力。结果表明:在有机碳源缺乏的条件下,成熟颗粒污泥中氨氧化细菌(ammonia oxidizing bacteria, AOB)和硝化细菌(nitrite oxidation bacteria, NOB)活性升高,60 d左右可实现较高的硝化活性;成熟好氧颗粒污泥粒径减小,丝状菌消失,球菌增多,颗粒污泥更加密实;EPS质量浓度及多糖(polysaccharide, PS)与蛋白质(proteins, PN)质量比升高;在有机碳源缺乏的条件下,成熟好氧颗粒污泥并未完全解体,具有较强的耐冲击能力。本研究证实了好氧颗粒污泥处理缺乏有机碳源废水的潜力,为好氧颗粒污泥的实际应用提供了理论基础。

Performance of mature aerobic granules under the absence of organic carbon source

Physicochemical properties, microbial activities, extracellular polymeric substances(EPS)and structure stability of mature aerobic granules were studied to investigate the effect of organic carbon source absence on the stability and nitrification activity of aerobic granules, the capability of upholding shock of aerobic granules was tested. Results showed that microbial activity of ammonia oxidizing bacteria(AOB)and nitrite oxidizing bacteria(NOB)increased, and high nitrifying activity achieved on 60 d under the absence of organic carbon source. Under the absence of organic carbon source, particle size of aerobic granules decreased. Aerobic granules became compacter with loss of filamentous bacteria and increase of spherical bacteria. EPS mass concentration and the mass ratio of polysaccharide and proteins increased. Under the absence of organic carbon source, mature aerobic granules didnt disintegrate completely and had good capability of upholding shock. This study verified the potential of aerobic granules treating wastewater under the absence of organic carbon source, and provided fundamental basis for the practical application of aerobic granules.