Li Zhi-Hua, Zhang Yu-Rong, Yang Fan, Li Sheng, Ji Xiao-Qin
Key Laboratory of Northwest Water Resources, Environment and Ecology, Ministry of Education, School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China.
Huan Jing Ke Xue. 2012 Apr;33(4):1299-305.
Aerobic granular sludge that could simultaneously remove nitrogen and phosphorus was cultivated in a sequencing batch reactor (SBR). Three groups were divided using 100-, 60- and 40- mesh sieves resulting the size ranges were 150-280 microm, 280-450 microm and > 450 microm, respectively, and the physicochemical properties of different groups were analyzed. Results showed that during the initial period of granulation (7 - 18 d), the compact granules could provide the anaerobic niche for the substrate the competition between GAOs and PAOs; and the compact granules was favorable for the enrichment and growth of PAOs, resulting in different phosphorous fractions in different size of granules: granules with the size of 280 - 450 microm exhibited the highest content of organic phosphorous faction, i.e., 113.25 mg x g(-1). In contrast, these granules showed the lowest content of inorganic phosphorous fraction, i.e., 15.55 mg x g(-1). In a later period, the content of organic phosphorous fraction in granules was similar after 34 d about 50 mg x g(-1), and the inorganic phosphorous fraction became similar after 52 d was 70 mg x g(-1), and the total organic phosphorous fraction of sludge in the reactor were higher than those in the solids effluent. The phosphorous fraction in different size granules was affected by the sludge retention time. The total phosphorous accounted for 11% of total weight of sludge, and the inorganic phosphorous accounted 4.24%. Additionally, the settling velocity, specific weight of bigger granules were higher than the smaller one, and these values were well correlated with total phosphorous. Concerning on denitrification, bigger and smaller granules showed high denitrification efficiency, and the gradient of NO3(-) -N between inside of granules and bulk solution was an important factor for denitrification rate.
在序批式反应器（SBR）中培养出了能同时去除氮和磷的好氧颗粒污泥。使用100目、60目和40目的筛网将其分为三组，得到的粒径范围分别为150 - 280微米、280 - 450微米和> 450微米，并分析了不同组的理化性质。结果表明，在颗粒化初期（7 - 18天），密实的颗粒可为底物提供厌氧微环境，利于聚糖菌（GAOs）和聚磷菌（PAOs）之间的竞争；密实颗粒有利于PAOs的富集和生长，导致不同粒径颗粒中磷的形态不同：粒径为280 - 450微米的颗粒中有机磷形态含量最高，即113.25毫克·克⁻¹。相比之下，这些颗粒中无机磷形态含量最低，即15.55毫克·克⁻¹。在后期，34天后颗粒中有机磷形态含量相似，约为50毫克·克⁻¹，52天后无机磷形态含量相似，为70毫克·克⁻¹，且反应器中污泥的总有机磷形态含量高于固体流出物中的含量。不同粒径颗粒中的磷形态受污泥停留时间影响。总磷占污泥总重量的11%，无机磷占4.24%。此外，较大颗粒的沉降速度和比重高于较小颗粒，且这些值与总磷有良好的相关性。关于反硝化作用，较大和较小颗粒均表现出较高的反硝化效率，颗粒内部与本体溶液之间的NO₃⁻ - N梯度是影响反硝化速率的重要因素。
