高氨氮、偏碱性条件下好氧颗粒污泥的培养及其特征

Cultivation and Characteristics of Aerobic Granular Sludge under Highconcentration Ammonia Nitrogen and Partial Alkalinity Conditions

在高氨氮、偏碱性条件下培养好氧颗粒污泥,并对其特征进行了研究。结果表明,在高氮氮、偏碱性条件下,好氧颗粒能够在一周内出现,一个月内形成稳定的颗粒化污泥。偏碱性条件有效地抑制了丝状菌的生长,形成的颗粒污泥直径小、密实;且在颗粒形成过程中污泥流失少,SVI值波动不大。在好氧颗粒污泥稳定阶段,60%的颗粒污泥粒径为0.3～0.6 mm,绝大部分的颗粒污泥含水率和沉降速度分别在94%和25 m/h左右。同时,在高氨氮生长压条件下培养出的好氧颗粒污泥具有较强的硝化和反硝化能力,其比硝化速率、比反硝化速率分别为0.41 kgNH4+-N/(kgMLSS.d)和0.435 kgNOx--N/(kgMLSS·d)。

Aerobic granular sludge was cultivated under the conditions of high-concentration ammonia nitrogen and partial alkalinity, and its characteristics were investigated. The results indicated that aerobic granular sludge could appear within one week and reach stability within one month under the high-concentration ammonia nitrogen and partial alkalinity conditions. Small diameter and dense structure were observed in the aerobic granular sludge, likely resulting from the effective restraint of filamentous bacteria growth under alkaline condition. In the granulation process, the change of MLSS was small, and SVI was relatively stable. In the stable operation process, the diameter of aerobic granular sludge with 60% dry weight was in the range of 0.3 to 0.6 mm. The water content and settling velocity of most granules were about 94% and 25 m/h respectively. Moreover, the aerobic granular sludge cultivated under highly selective pressure of high-concentration ammonia nitrogen presented good nitrification and denitrification ability, with the specific nitrification rate of 0.41 kgNH4 -N/（ kgMLSS · d）and the specific denitrification rate of 0.41kgNH^＋4-N/（ kgMLSS ·d）.