Mbr Package System

Products Description

 

The MBR package system is suitable for small-scale, centralized domestic sewage treatment in villages and towns, as well as for the interception and purification of polluted river water. After treatment, the water can be safely discharged or reused to meet environmental standards.

The MBR package system we provide is an integrated sewage treatment solution. The owner only needs to provide a foundation for the equipment. Once the equipment is in place, the inlet and outlet connections are made, power is supplied, and the system is ready for operation.

 

Feature

 

◆ Engineering Equipment and System Integration
◆ Customizable Process and Size: Can be used individually or in clusters.
◆ Cost and Space Efficiency: Saves on investment, land, and construction time.
◆ Simple and Reliable System: The equipment has a high level of automation and can operate unattended.
◆ Reduced Civil Engineering Work: Minimizes construction risks and the environmental impact on the surrounding area.
◆ Aesthetically Designed Equipment: The equipment blends well with its surroundings.
◆ Portability and Reusability: The equipment can be relocated and reused, reducing waste, making it especially suitable for small, temporary sewage treatment projects.
◆ Wide Application: The equipment is ideal for use in communities, schools, hospitals, hotels, airports, scenic spots, and other facilities.

 

 

Process description

 

Screen Channel: Sewage is collected and transported to the treatment station through the pipe network. First, large solid particles and floating objects in the sewage are removed by the screen, ensuring stable operation of the subsequent treatment equipment. The screen residue is regularly removed for disposal.

Regulating Tank: The regulating system consists of the regulating tanks, lifting pumps, level meters, and other auxiliary systems. The flow and concentration of sewage are buffered and regulated here. This regulation ensures that the volume and quality of water entering the subsequent biochemical treatment system remain stable, improving treatment efficiency. The sewage is lifted by the regulating tank pump and enters the integrated sewage treatment equipment.

MBR Integrated Sewage Treatment Equipment:
The MBR system consists of a primary anoxic tank, an aerobic tank, a secondary anoxic tank, an MBR membrane tank, a clean water tank, an equipment room, and related supporting equipment. When sewage enters the MBR system, it first passes through the screen to remove hair and solid debris, protecting the membrane components. The sewage then flows sequentially through the primary anoxic tank, aerobic tank, secondary anoxic tank, and MBR membrane tank.

The sewage undergoes full degradation through the combined action of high-concentration suspended activated sludge and a fixed biofilm on the filler. The biodegraded water is filtered through the hollow fiber membrane, and purified clean water is discharged under the suction of the outlet pump. The membrane effectively intercepts bacteria and suspended solids in the biochemical system. It also efficiently captures nitrifying bacteria, ensuring smooth nitrification and the effective removal of NH3-N. Furthermore, the membrane traps macromolecular organic matter that is difficult to degrade, prolonging its residence time in the system and maximizing its degradation. After membrane filtration, the effluent meets discharge standards and undergoes ultraviolet disinfection for further purification.

To enhance the denitrification effect, the biochemical process in the MBR system uses the AOAO process. Part of the sludge from the MBR membrane tank is returned to the aerobic tank. Since the membrane flushing strength must be maintained in the MBR membrane tank, the aeration volume is large, and the dissolved oxygen in the water is nearly saturated. The returned sludge not only supplements the amount of activated sludge but also introduces a large amount of dissolved oxygen to the aerobic tank. This reduces the required aeration volume in the aerobic tank and ensures more efficient use of dissolved oxygen, thereby reducing energy consumption.

The primary anoxic tank, located at the front of the treatment system, is where hydrolysis, acidification, and denitrification first occur. The denitrifying bacteria in this tank convert nitrate in the mixed liquid return from the membrane tank into nitrogen gas through biological denitrification, which then escapes into the atmosphere. In the aerobic tank, activated sludge converts the organic nitrogen in the inflow into ammonia nitrogen, which is further converted into nitrate through biological nitrification. In the secondary anoxic tank, denitrifying bacteria convert the nitrate produced in the aerobic tank into nitrogen gas through biological denitrification, completing the denitrification process.

Compared to the traditional A2O process, this approach eliminates the need for nitrification liquid return, reduces energy consumption, and enhances the denitrification capability of the treatment system.

To ensure that the total phosphorus content of the effluent meets regulatory standards, the integrated MBR system is also equipped with a chemical phosphorus removal function. When biochemical phosphorus removal cannot meet the discharge requirements, the chemical phosphorus removal system is activated. The dosing device automatically adds the phosphorus removal agent to the MBR membrane tank based on a preset dosage. The agent undergoes chemical precipitation and flocculation with phosphate in the water, facilitated by hydraulic stirring and mixing in the membrane tank. The phosphate is then removed through the efficient interception of the MBR membrane.

Engineering experience shows that membrane separation in the MBR process significantly contributes to the interception of total phosphorus. The implementation of chemical phosphorus removal only requires the formation of small flocs that can be intercepted by the membrane, thus saving on the amount of dosing required. Using phosphorus removal agents for chemical phosphorus removal in the MBR system not only achieves effective phosphorus removal but also has minimal impact on sludge properties and membrane fouling, making it an economically viable solution. The pore size of the MBR membrane ranges from 0.1 to 0.4 μm, while the size of Escherichia coli (length × width) is about 0.4–0.7 × 1–3 μm. Therefore, Escherichia coli can generally be retained by the membrane, and the effluent is further disinfected using ultraviolet light to achieve standard discharge levels.

Sludge Tank:
The small amount of residual sludge generated during the operation of the MBR system is first transferred to the sludge thickening tank for concentration. After concentration, the supernatant is returned to the regulating tank, while the concentrated sludge is periodically removed for disposal.

Control System:
The entire sewage treatment process is fully automated and controlled by a PLC. Except for the addition of chemicals, no manual intervention is required. The system can also be switched from automatic control to manual control if needed.

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