微纳米气泡催化氧化强化污泥减量及脱水性能研究

Contrastive study on sludge reduction and dewaterability by catalytic oxidation with micro-nano bubbles

以FeSO4为催化剂,耦合空气微纳米气泡或臭氧微纳米气泡处理污泥,分析了两种气源条件下污泥干重减量效果及污泥脱水性的变化。结果表明,反应时间85 min,处理温度30℃,pH=3,Fe^2+浓度2 mmol/L的最佳工艺条件下,空气微纳米气泡处理后污泥干重减少率达38.56%;臭氧微纳米气泡处理污泥干重减少率达44.88%,此时污泥脱水CST值降低率分别为66.57%和72.37%,污泥VSS/TSS值分别降至0.615和0.57,污泥稳定性提升。污泥减量效果和脱水性能提升的原因在于微纳米气泡的高级氧化能力和类芬顿反应的形成。

FeSO4 was used as catalyst to treat sludge by coupling air micro-nanobubbles and ozone micro-nanobubbles.The effects of dry weight reduction and dewaterability of sludge under two kinds of gas sources were analyzed.The results show that under the optimum conditions of reaction time 85 min,temperature 30℃,pH=3 and Fe^2+concentration 2 mmol/L,the reduction rate of dry weight of sludge treated by air micro-nanobubbles is 38.56%,that of sludge treated by ozone micro-nanobubbles is 44.88%,and that of CST value of sludge dewatering is 66.57%and 72.37%,respectively.VSS/TSS values were reduced to 0.615 and 0.57,sludge stability was enhanced.The improvement of sludge reduction and dewatering performance is due to the advanced oxidation ability of micro-nanobubbles and formation of Fenton-like reaction.