Expanded sludge is a common problem in membrane bioreactors (MBRs) and can adversely affect membrane fouling and system operation. Therefore, it is of great significance to study the effect of expansive sludge on MBR membrane fouling.
Expanded sludge can lead to fouling of membranes. The sludge layer in the membrane equipment has a certain permeability, but when the sludge expands, the contact area between the sludge particles and the membrane increases, which is easy to cause the deposition and adhesion of sludge. This deposition and adhesion can lead to a decrease in the efficacy of the membrane and may lead to clogging of the membrane, which can reduce the efficiency of MBR treatment.
Expanded sludge can also have a negative impact on the operation of MBR's system. Expanded sludge can occupy the effective volume in the reactor, reducing the treatment capacity of wastewater. In addition, when the sludge swells to a certain extent, it may cause the sludge to float on the surface of the water, so that the suspended solids and microorganisms in the sewage are not effectively degraded. These issues can affect the operational stability and treatment of the MBR process.
In order to solve the problem of MBR membrane contamination by expansive sludge, researchers have taken a series of measures. For example, the generation and development of expansive sludge can be inhibited by controlling the operating conditions of MBR, such as oxygen concentration, hydrolysis acidification stage, etc. In addition, it is possible to remove the expanded sludge adhered to the membrane by introducing operational measures such as aeration intensity control and backwashing, and prevent the membrane from clogging.
In addition, some studies have also proposed methods for constructing anti-swelling sludge membranes using special materials. These special materials can reduce the adhesion and deposition of expansive sludge to the membrane by changing the surface morphology of the membrane or special coating, and improve the anti-fouling performance of the membrane.
In conclusion, the influence of expanded sludge on MBR membrane fouling is an important problem that needs to be solved in the MBR process. Through reasonable operation measures and the application of special materials, the contamination of the membrane by expansive sludge can be effectively reduced, and the stable operation and efficient treatment effect of the MBR system can be ensured. Future research needs to further explore more effective control measures to deal with the problem of expanded sludge under different environmental conditions.
Anti-sticking agent solves the problem of MBR membrane sludge blockage.