Effect of typical water quality factors on oxygen transfer capacity in moving bed biofilm reactor
Against the background of saving energy and reducing consumption in sewage treatment and the strategetic background of"double carbon",aiming to increase the efficien-cy,enhance energy saving and carbon reduction,and to improve oxygen transfer capacity in sewage treatment,this study investigated the influence of water quality factors on oxygen transfer capacity in the moving bed biofilm reactor,and quantitatively analyzed the influen-cing mechanism of oxygen transfer capacity in terms of Sauter mean diameter of bubbles,the average velocity of bubbles rise and gas holdup.The results showed that when the concen-tration of sodium dodecyl sulfate(SDS)increased from 0 mg/L to 10 mg/L,the oxygen transfer capacity decreased under different carrier filling rates.However,when the SDS con-centration increased from 12 mg/L to 20 mg/L,the oxygen transfer capacity increased grad-ually.The presence of biofilm carrier weakens the effect of SDS on oxygen transfer capacity.When the total dissolved solids(TDS)value increased from 2000 mg/L to 12 000 mg/L,the oxygen transfer capacity was improved.When TDS value is greater than 12 000 mg/L,the oxygen transfer capacity tends to be constant.With the increase of pH value,the oxygen transfer capacity is improved.In the actual sewage treatment process,the energy consump-tion and cost of sewage treatment can be reduced by adjusting the aeration intensity accord-ing to the change of oxygen transfer capacity under different water quality conditions.
moving bed biofilm reactor(MBBR)oxygen transfer capacitywater qualitysurfactanttotal dissolved solid(TDS)pH
NETL
NSTL
万方数据
维普
