【摘要】 采用γ-射线辐照法对城市污水厂剩余污泥进行预处理,从固体组分、可溶性组分及厌氧产气量等角度来探讨γ-射线辐照法改善城市污水厂剩余污泥厌氧消化特性的可行性。结果表明,经γ-射线辐照处理后,污泥的平均粒径减小,在辐照剂量为6.51~30.75 kGy范围内,粒径的减小率达30%~50%;可溶性有机组分随着辐照剂量升高而增加,当辐照剂量为19.4 kGy时,SCOD增加率达552.5%;与未辐照相比,污泥经2.48、6.51、11.24 kGy辐照处理后,厌氧消化累计产气量分别增加8.89%、19.74%和35.81%。γ-射线辐照法是一种有效的改善污泥厌氧消化特性的方法,11.24 kGy左右的剂量可作为污泥预处理的最佳剂量。更多还原

【Abstract】 Anaerobic digestibility of excess sewage sludge was studied from the aspects of solid components,soluble components and gas production after γ-irradiation pretreatment.Average particle size of sludge was minished after γ-irradiation.The reduction rate of particle size was up to 30%~50% at absorbed doses from 6.51 to 30.75 kGy.Both soluble organic component and gas production were increased after irradiation.The addition of soluble chemical oxygen demand(SCOD) was up to 552.5% at 19.4 kGy.While accumulated gas production of anaerobic digestion increased 8.89%,19.74% and 35.81% at 2.48,6.51 and 11.24 kGy,respectively.All of these indicate that γ-irradiation pretreatment is an effective method to enhance anaerobic digestibility of sewage sludge and 11.24 kGy is considered to be the best dose for the pretreatment of sewage sludge.更多还原