Methods to extend the service life of MBBR system wastewater screen

Extending the service life of MBBR (moving bed biofilm reactor) system wastewater screen can be started from the following aspects:
Optimizing the pretreatment link
Physical pretreatment: Before the wastewater enters the wastewater screen of the MBBR system, add a physical pretreatment step. For example, setting a grid decontamination can remove larger solid debris, such as branches, plastic fragments, etc. If these large particles enter the filter, it is easy to cause mechanical damage and blockage of the filter. A sand settling tank can also be used to precipitate and remove sand particles with a larger specific gravity, etc., to reduce the wear on the filter.

Chemical pretreatment: For wastewater containing components that are easy to scale (such as calcium and magnesium ions), chemical softening treatment can be performed. By adding chemical agents, these ions are precipitated to prevent them from scaling on the filter surface and clogging the filter pores. In addition, for wastewater containing sticky organic matter or grease, flocculants can be added to make the organic matter and grease condense into larger particles, which are convenient for removal in the pre-filtration stage and reduce the filtration burden of the filter.

Reasonable filter operation and maintenance
Regular cleaning: formulate a scientific cleaning plan, and clean the filter regularly according to the nature of the wastewater and the blockage of the filter. The cleaning method can be a combination of physical cleaning and chemical cleaning. Physical cleaning, such as flushing with a high-pressure water gun, can effectively remove impurities attached to the surface of the filter; chemical cleaning is to use a suitable chemical cleaning agent to dissolve or decompose organic matter, inorganic matter, etc. that block the pores of the filter. For example, for filters blocked by biofilms and organic matter, a solution containing enzyme preparations or alkaline cleaning agents can be used for soaking and cleaning.

Monitoring and controlling flow and pressure: Install flow and pressure monitoring equipment to monitor the flow and pressure changes of wastewater passing through the filter in real time. When the flow rate decreases or the pressure increases beyond a certain range, it may mean that the filter is blocked. Reasonably control the flow and pressure of the wastewater to avoid excessive flow and pressure from causing impact and damage to the filter. At the same time, according to the monitoring data, timely adjust the operating parameters, such as adjusting the water inlet valve to control the flow within the design range of the filter.

Improve the performance of the filter itself
Choose the appropriate screen material and structure: According to the characteristics of the wastewater, choose a filter material with good corrosion resistance, wear resistance and anti-clogging ability. For example, for wastewater containing chemically corrosive substances, choose a corrosion-resistant stainless steel or plastic filter. In terms of structure, use a filter structure with a self-cleaning function, such as a filter with a backwashing device, or choose a multi-layer composite structure filter with a reasonable pore distribution and not easy to clog, which can automatically remove some impurities during the filtration process and extend the service life.

Backup and rotation of the filter: Equipped with a spare filter, when the filter in use needs to be cleaned or fails, it can be replaced in time to ensure the continuous operation of the MBBR system. At the same time, the replaced filter is thoroughly cleaned and maintained so that it can restore its performance and be recycled, which also helps to extend the service life of the overall screen.
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