旁路微氧污泥减量效果及其影响因素

通过对旁路微氧污泥减量技术中好氧污泥在微氧池中的减量效果及其影响因素的研究,发现污泥减量效果与微氧池的污泥浓度(MLSS)、好氧污泥与厌氧污泥的比例(α)、微氧池的氧化还原电位(ORP)、微氧池的污泥停留时间有关。当微氧池的α=2∶8、MLSS为10 000 mg/L时,减量效果最佳;通过不同MLSS和不同α值两组试验,得出在最佳值时的减量率分别为19.15%和19.61%。低ORP值条件下微氧池污泥颗粒细碎,中位粒径为20.24μm,而好氧污泥的中位粒径为32.18μm。同时,混合液中溶解性大分子有机物含量明显增加。该工艺使污泥有更充分的时间进行内源呼吸和EPS的离解释放,从而实现了污泥减量。

Effect and Influencing Factors of Bypass-microaerobic Sludge Reduction Process

A laboratory study of the microaerobic sludge reduction technology by a bypass sludge loop(bypass-microaerobic sludge reduction process) was undertaken to determine the influencing factors of sludge reduction.The results showed that sludge reduction in a microaerobic tank was influenced by mixed liquor suspended solids(MLSS),the ratio of aerobic activated sludge and anaerobic activated sludge(α),oxidation-retention potential(ORP) and sludge reduction time(SRT).When α was 2 ∶ 8 and MLSS was 10 000 mg/L in the microaerobic tank,the optimal reduction result was reached.The highest sludge reduction rates were 19.15% and 19.61% in two experiments with different MLSS and α.The particle size of activated sludge in the microaerobic tank with low ORP was very small.The median particle diameter of the microaerobic sludge was 20.24 μm,while the size of aerobic sludge was 32.18 μm.Meanwhile,macromolecule substance in the mixed liquor increased significantly.The process allowed enough time for microaerobic activated sludge to undertake endogenous respiration and EPS dissociation and release,thus achieving sludge reduction.