Precautions for replacing the wastewater screens for MBBR system

The wastewater screens for MBBR (moving bed biofilm reactor) system achieves efficient impurity interception mainly through the following ways:
Reasonable aperture design
Matching according to the particle size of impurities: The aperture of the wastewater filter is one of the key factors to achieve efficient interception. When designing, the particle size distribution of impurities in the wastewater to be treated will be fully considered. For general MBBR system wastewater, it may contain impurities such as suspended particles, colloids, and fibers. By analyzing the wastewater sample, determine the particle size range of the main impurities, and then select the appropriate filter aperture. For example, if most of the suspended particles in the wastewater are between 50 and 200 microns, the filter aperture can be designed to be less than 50 microns, which can effectively intercept these impurities and prevent them from entering the MBBR reaction area and affecting the biological treatment process.

Multi-level aperture combination: In order to cope with complex impurity situations, some wastewater filters adopt a multi-level aperture design. The outer layer has a larger aperture, which can initially intercept larger particle size impurities, such as leaves, large particles of sediment, etc. As the wastewater flows, the inner pore size gradually decreases, which can intercept smaller impurities more finely, such as colloidal particles and small fibers. This multi-level design can improve the efficiency of impurity interception and avoid the problem of blockage or incomplete interception that may occur in single-aperture filters.

Special filter materials and surface characteristics
Hydrophilic and anti-fouling materials: The choice of filter material has a great influence on the interception efficiency. Hydrophilic materials can make wastewater spread better on the filter surface, reduce the adhesion resistance of impurities on the filter surface, and facilitate the interception of impurities by the filter. At the same time, some materials with anti-fouling properties can prevent impurities from accumulating and clogging on the filter. For example, a specially treated high molecular polymer filter has an anti-fouling coating on its surface, which can reduce the adsorption of organic matter, microorganisms, etc. on the filter and maintain the filtering performance of the filter.

Charged filter surface: The filter surface is treated to give it a specific charge. When the impurity particles in the wastewater have opposite charges, they will be more easily adsorbed and intercepted by the filter under the action of electrostatic attraction. This charge adsorption effect can enhance the interception effect of some tiny charged particles and improve the impurity removal capacity of the entire filter.

Optimized filter structure and water flow design
Increase the filtration area: In a limited space, the filtration area is increased by designing a special filter structure. For example, the use of a folded, corrugated or honeycomb filter structure can provide more filtration area under the same volume, so that the wastewater has more opportunities to contact the filter, thereby increasing the probability of impurity interception.

Reasonable water flow distribution: In the MBBR system, the flow direction and speed of wastewater entering the filter are carefully designed. The use of reasonable water inlet methods, such as tangential water inlet or multi-point uniform water inlet, can make the wastewater evenly distributed on the filter, avoiding local water flow too fast to cause impurities to penetrate the filter. At the same time, by setting a suitable water flow rate, impurities have enough time to deposit or be intercepted on the surface of the filter, and will not be washed away due to excessive water flow. For example, according to the pore size and material characteristics of the filter, the water flow rate is controlled within a certain range, so that impurities can be effectively removed under the combined action of gravity, inertia and filter interception force.

Through the comprehensive application of the above methods, the wastewater screens of the MBBR system can effectively intercept impurities in the wastewater and create good conditions for the subsequent biological treatment process.
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