The new MBBR process is a wastewater treatment process that has been optimized based on the traditional anoxic-aerobic process. This process not only retains the core advantages of the old process, but also adds a primary anoxic tank to enhance the effects of endogenous denitrification and biological phosphorus removal.
This improvement enables the new MBBR process to more efficiently remove pollutants such as organic matter, nitrogen, and phosphorus during wastewater treatment. At the same time, the process also introduces MBBR technology, which is a technology that uses attached biofilms on moving beds to treat wastewater. Through this technology, pollutants such as organic matter, nitrogen, and phosphorus in wastewater can be effectively degraded and removed by microorganisms on the biofilm.
Process principle
1. Principle of the new process:
The new process is an efficient wastewater treatment process. It adopts a three-stage anoxic-aerobic (A/O) combination to achieve effective removal of pollutants in wastewater through different biological reaction processes. The wastewater first enters the primary anoxic tank, where the environment is anoxic, which is conducive to the growth and reproduction of denitrifying bacteria. Denitrification reaction is carried out here, using organic matter in the wastewater as an electron donor to reduce nitrate nitrogen to nitrogen gas, thereby removing nitrate nitrogen.
Subsequently, the wastewater enters the secondary anoxic tank (or anaerobic tank). The environment in this tank is strictly anaerobic, which is conducive to the growth and reproduction of anaerobic bacteria. Anaerobic hydrolysis and acidification reactions are carried out here to convert insoluble organic matter into soluble organic matter, and at the same time, large molecular organic matter is also converted into small molecular organic matter, providing more favorable conditions for subsequent aerobic treatment.
Finally, the wastewater enters the aerobic tank. The environment in this tank is aerobic, which is conducive to the growth and reproduction of nitrifying bacteria and aerobic heterotrophic bacteria. Nitrification reaction takes place here to convert ammonia nitrogen into nitrate nitrogen. At the same time, through the action of aerobic heterotrophic bacteria, organic matter is further degraded so that the effluent water quality meets the discharge standards.
2. MBBR process principle:
MBBR process is a new type of wastewater biological treatment process. It increases the biomass and biological species in the reactor by adding a certain amount of suspended carriers (such as plastic biofilm sheets, polypropylene balls, etc.) into the reactor. The surface of these suspended carriers is rough, which is conducive to the attachment and growth of microorganisms, thereby forming a biofilm.
The microorganisms on the biofilm use the organic matter in the wastewater for growth and metabolism, thereby degrading and removing pollutants. Compared with the traditional activated sludge method, the MBBR process has higher biomass and richer biological species, so it has higher treatment efficiency and stronger resistance to shock loads.
During the aeration process, the buoyancy generated by the rise of air bubbles drives the filler and the surrounding water to flow, increasing the contact area between the biofilm and oxygen and the oxygen transfer efficiency. At the same time, this flow also promotes the uniform mixing and mass transfer process of the substances in the reactor, further improving the treatment effect. Therefore, the MBBR process has broad application prospects and huge development potential in the field of wastewater treatment.
Detailed explanation of process characteristics
1. High efficiency: The new process is a new type of sewage treatment process that integrates the old process and MBBR technology. It has the advantages of both and has high efficiency in organic matter removal, denitrification and phosphorus removal. Through optimized design and precise control, the process can quickly degrade organic matter in a short time and effectively remove pollutants such as nitrogen and phosphorus in the water.
2. Strong resistance to shock load: The attached biofilm in MBBR technology is a unique biological treatment method that uses the biofilm formed by microorganisms on the surface of the carrier to degrade organic matter and remove nitrogen and phosphorus. Because the attached biofilm has good tolerance to shock loads and inhibitory substances, the entire process system can still maintain stable and reliable operation when facing complex water quality conditions such as high concentration of organic matter, high ammonia nitrogen, and high salinity, ensuring that the effluent water quality is stable and meets the standards.
3. High flexibility: It has a high degree of flexibility and can adapt to different treatment needs by changing operating conditions (such as mixing speed, wastewater residence time, etc.). This flexibility enables the process to be widely used in urban sewage treatment, industrial wastewater treatment, agricultural wastewater treatment and other fields to meet the treatment needs under various complex water quality conditions.
4. Small footprint: Compared with traditional bioreactors, it has a higher treatment capacity. By optimizing the design and improving the treatment efficiency, the process can achieve higher treatment capacity while ensuring the quality of effluent, thereby reducing the space requirements of treatment facilities. This is undoubtedly a huge advantage for cities and regions with tight land resources.
Simple maintenance and management: The stirring and aeration system of MBBR technology is easy to operate and maintain. Due to the presence of attached biofilms, the microbial concentration in the reactor is high and the activity is strong, thereby reducing the aeration volume and stirring energy consumption. At the same time, the attached biofilm also has the ability to self-renew and repair, making the maintenance and management of the entire process system easier and more convenient.
MBBR process operation precautions
1. Filler selection: In the MBBR process, the characteristics of the filler are crucial to the performance and stable operation of the process. The specific gravity, specific surface area, durability, permeability and suspension of the filler will affect the formation of the biofilm and the treatment effect of sewage. Therefore, when selecting fillers, it is necessary to evaluate and adjust according to the specific application situation to ensure that the filler can meet the needs of the process, improve the treatment efficiency and reduce the operating cost.
2. Aeration system design: In the aerobic tank of the MBBR process, an appropriate aeration system can ensure the fluidization effect of the biological carrier fluidized filler, thereby ensuring that the filler and sewage are fully mixed, collided and contacted, and promote the formation and renewal of the biofilm. Therefore, the design of the aeration system should be reasonable and can be flexibly adjusted according to different water quality and water volume to ensure the stability and efficiency of the process.
3. Anti-clogging measures: In the biological pool of the MBBR process, the filler is easy to accumulate at the outlet, resulting in clogging problems. In order to avoid the loss of filler, devices such as gratings or grids should be set at the outlet. However, these devices also need to be cleaned regularly to prevent blockage. At the same time, the status of the filler and aeration system should be checked regularly to detect and deal with problems in time to ensure the normal operation of the MBBR process.