【摘要】 利用富磷剩余污泥进行重力浓缩试验,分别以硝酸盐、亚硝酸盐、溶解氧作为电子受体,考察不同浓度的电子受体对厌氧浓缩过程中磷释放的影响。结果表明:当有硝酸盐存在时,剩余污泥几乎不释磷,当硝酸盐浓度达到60 mg/L时,对释磷具有明显的抑制作用;低浓度的亚硝酸盐对磷的释放也有一定的抑制作用,但是当亚硝酸盐浓度>35 mg/L时,反而会促进磷酸盐的释放;控制曝气时间以保证一定的溶解氧量,随着曝气时间的延长,硝酸盐浓度不断增加,浓缩时污泥起始释磷时间推后,当曝气时间达到24 h时,对污泥释磷具有明显的抑制作用。更多还原

【Abstract】 Phosphorus-rich excess sludge was used to perform gravity thickening test,and the effect of different concentrations of electron acceptors on anaerobic phosphorus release during gravity thickening of phosphorus-rich excess sludge was investigated using nitrate,nitrite and DO as electron acceptors.The results show that the excess sludge does not release phosphorus in the presence of nitrate,and the inhibition effect is obviously when the nitrate concentration is 60 mg/L.The low concentration of nitrite inhibits phosphorus release to a certain extent,however,when the nitrite concentration is higher than 35 mg/L,the phosphorus release is promoted.The aeration time is controlled to guarantee a certain amount of dissolved oxygen,as the aeration time is increased,nitrate concentration is increased and the phosphorus release time delays during gravity thickening.There is a significant inhibitory effect on the phosphorus release when the aeration time is more than 24 h.更多还原