污泥接种量对好氧污泥颗粒化的影响研究

考察了污泥接种体积分别为25％、50％和75％的反应器有效容积情况下的污泥颗粒化特征。结果发现，25％体积的污泥接种量利于颗粒污泥的形成和成长，其颗粒化程度高、平均粒径大且粒径分布范围广，而50％和75％体积的污泥接种量只能形成少量细小的颗粒污泥。分析认为，悬浮分散污泥是颗粒化的一个较大障碍，较少的接种量能够提供较大的自由沉淀空间，使污泥能够实现重力分层，进而排除与颗粒污泥竞争底物的悬浮不沉降污泥，从而利于颗粒化。污泥颗粒化的直接影响因素不是沉淀时间而是自由沉淀空间。沉淀时间的缩短使自由沉淀空间增加，从而影响了污泥颗粒化进程。

Study on the Influence of Seed Sludge Volume to Aerobic Sludge Granulation

Granulation of aerobic sludge with different seed sludge volume,which(25%,50% and 75% of effective volume of the reactor)was observed.It was found that seed sludge with 25% volume,which translated into lots of granules with great average(diameter)and extensive diameter distribution,benefited granular sludge formation and growth.Seed sludge with 50% and 75% volume only formed a few tiny granules.Suspended dispersed sludge was a big trouble for granulation.Lesser seed sludge volume provided(biggish) free settling space,which could layer sludge by weight.Then the suspended dispersed sludge,which competed organic matter with granular sludge would be excluded from the reactor.Instead of settling time,free settling space was the direct influencing factor for granulation.Decreasing settling time just leaded to increasing free settling space.