响应面法优化解体好氧颗粒污泥的修复方式

Optimizing the repairing method of decomposition aerobic granular sludge by response surface methodology

通过小试实验,探究提高氨氮、COD浓度、水力剪切力以及投加活性污泥和活性炭粉末对解体好氧颗粒污泥的修复效果,得出进水COD浓度以及投加活性污泥和活性炭对颗粒修复影响较大但单一修复方式效果不理想,进而针对这3个因素,采用响应面法得出其最优耦合修复工况(进水COD、投加活性炭和活性污泥质量浓度分别340mg/L、4.64g/L和2900mg/L).经过17d运行,解体AGS得到良好修复并通过扫描电镜(SEM)对其形态进行观察,可知修复后AGS表面以丝状菌为主,孔隙、裂痕大幅减少,污泥以活性炭为晶核形成新的AGS并且颗粒修复后粒径由(0.89±0.5)mm快速增加到了(2.19±0.4)mm,氨氧化速率(以LVSS记)由2.49mg/(g·h)提高到3.18mg/(g·h),由此验证了这种耦合修复方式对解体AGS具有高效且快速的修复作用.

The research exploring the restorative effects of Ammonia nitrogen, the Chemical oxygen demand concentration, Hydraulic shear force, adding sludge and Activated carbon powder for disintegrating the aerobic granular sludge, got the results firstly that the influent COD concentration and activated sludge and activated carbon had great influence on the restorative effects, but the effect of a single repair method was not unsatisfactory; secondly, taking the way of responding surface analysis concluded that the restoration of coupling was the best way with the Influent COD of 340mg/L, the activated carbon of 4.64g/L and activated sludge quality concentrations 2900mg/L. With 17days of operation, the disintegration of AGS has gotten the positive restorative effects. Observing the morphology from the appearance and scanning electron microscopy, it was found that the filamentous bacteria have dominated the surface of AGS,. simultaneously, the pore and fissure were greatly reduced, and the sludge formed new AGS with activated carbon as crystal nucleusThe particle size increased rapidly from （0.89±0.5）mm to （2.19±0.4）mm, the rate of ammonia oxidation （in LVSS） has been increased from 2.49mg/（g·h） to 3.18mg/（g·h）, which proved that the restoration of coupling had the positive and rapid effect on disintegrating AGS.