臭氧氧化与序批式好氧活性污泥法组合工艺的污泥减量化效果

Effect of Sludge Reduction by Ozone Oxidation Combined with Sequencing Batch Aerobic Activated Sludge Processes

该文研究了臭氧技术应用于剩余污泥处理过程中臭氧利用率及污泥的可生化性随时间的变化,组建了臭氧氧化与序批式好氧活性污泥法结合的联合工艺。将臭氧单元处理过的污泥全部回流至曝气池与污水进行合并处理,考察了不同臭氧投加量下联合工艺中剩余污泥的产量和污水处理效果。结果表明,当处理污泥浓度为4 000 mg/L,污泥体积为3 L,臭氧进气浓度为6.5 mg/L,气量为6 L/min时,前20 min的臭氧利用率几乎为100%,随后利用率逐渐降低;污泥的可生化性先降低,而后逐渐升高,在30 min时达到最大,其后又开始下降;当臭氧投加量为0.078 kg O3/kg MLSS时,联合工艺的污泥增长率几乎为0,同时出水水质相对对照组没有明显变化。

Ozone utilization rate and the changes of sludge biodegradability with time in the process of excess sludge ozonation were studied.A combined process was formed with ozone oxidation and sequencing batch aerobic activated sludge technique.In the study,all the treated excess sludge returned to the aeration tank.Under the studied conditions（the sludge concentration 4 000 mg / L,the sludge volume 3 L,the intake ozone concentration 6.5 mg / L and the flow rate 6 L / min）,the ozone utilization rate was nearly 100 % during the beginning 20 minutes,then it fell over the reaction time;the sludge biodegradability aecreased first then increased gradually till it reached to its peak at 30 min,then it fell again;the excess sludge production of combined process was nearly zero when the ozonation dosage was 0.078 kg O3 / kg MLSS,and the qualities of the output water didn＇t show much differences compared with the control.