预热ATAD工艺处理市政污泥工程

Pilot Test of Sludge Preheated Autothermal Thermophlilic Aerobic Digestion

在中试的基础上,建立一套有效容积为700 m3的污泥预热高温好氧消化工艺,在进泥含固率为6%,VSS浓度为42.1 g/L,搅拌速率为150～160 r/min,曝气量为2.0～2.2 m3/h的工艺参数条件下,45℃下预热24 h,污泥在消化进行到第10 d时已达到稳定化和无害化的标准,出泥达到A级生物固体的标准,并发现VSS和DHA的降解率与污泥停留时间和反应温度的乘积密切相关,当乘积为500(℃.d)以上时,污泥才能达到稳定化的标准。

The one-stage ATAD equipment with 700 m3 effective volume was constructed.In the process parameters of total solid and VSS of feed sludge were 6 % and 42.1 g/L,agitation velocity was 150～160 r/min,aeration was 2.0～2.2 m3/h,preheated temperature and time were 45 ℃ and 24 h respectively,when SRT was 10 d,the digested sludge reached the standard of stability and harmlessness,which was accorded with the class A biomass.The relation between VSS and DHA degradation rate and the cross product of SRT with reaction temperature was closed related.Sludge reached stability standard when the cross product was above 500（℃？d）.