A study on the application of ozonation for excess sludge reduction in sewage and food processing wastewater treatment

摘要

A study was made on ozonation for reducing excess sludge in sewage and food processing wastewater. Ozonation applied for sewage treatment which used a settling tank revealed that an injection of 1 kg of ozone resulted in approximately 3 kg of sludge reduction. A biological reaction was also confirmed inside the ozone reactor. Membrane filtration used for solid-liquid separation resulted in less sludge reduction than in the case of using the settling tank. However, studying the sludge generation for both cases revealed a clear reduction in microorganisms, i.e. for both the settling tank and membrane filtration. In contrast, ash elements and organics other than microorganisms were hard to become reduced by membrane filtration, thus resulting in lower sludge reduction.