Brewery wastewater is mostly generated during the brewing, fermentation, saccharification, and other steps in the creation of beer. It has a high percentage of organic material and is biodegradable. As a result, biochemical treatment of brewery effluent has long been the favoured procedure.
Aerobic biological treatment (activated sludge method, biofilm method), anaerobic biological treatment and a combination of aerobic and anaerobic biological treatment, are the three main types of biochemical treatment methods now in use. These systems each have their own benefits and drawbacks, including a difficult anaerobic process to maintain and operate, a lengthy HRT, a large area, a costly capital investment, and a propensity for sludge development, among others. Among these technologies, the usage of MBR process has increased.
What are the Benefits of using MBR for brewery wastewater treatment?
Membrane bioreactor (MBR) treatment technology combines membrane and bioreactor treatment technologies. It efficiently resolves the issue with the conventional brewery wastewater treatment process, because it can concurrently realise the degradation of pollutants by microorganisms, and the separation of pollutants by membrane in a small space.
The benefits of MBR technology over the conventional brewery wastewater treatment methods include:
· The effluent quality is outstanding and consistent
Low levels of N and P are present in brewery wastewater, and the typical activated sludge technique is susceptible to sludge growth, because of a C:N ratio that is out of balance.
Since, solid-liquid separation can be effectively accomplished with membrane filtering technology, the effluent is not impacted by things like sludge expansion in the bioreactor. Brewery wastewater may be effectively cleaned of harmful microorganisms, thanks to its low effluent suspended solids and turbidity.
· Compact size
The MBR membrane minimises the device's footprint, streamlines the process flow, and takes the place of the conventional secondary sedimentation tank. Additionally, because the volume load in MBR is higher due to the higher activated sludge concentration, the volume of the sludge concentration tank and the aeration tank can be adjusted, to make the device more compact.
· Increased nitrification efficiency and systematic breakdown of organic matter
The microorganisms are entirely contained in the bioreactor as a result of SRT extension and membrane retention, which allows nitrifying bacteria to grow and multiply more slowly.
Additionally, it can lengthen some refractory organics' hydraulic retention times in the system, which significantly boosts both organics' nitrification and degradation rates.
· Strong resistance to impact load
The wastewater from the manufacture of beer is discharged seldom, and the water quality and volume vary significantly, which frequently causes the effluent quality to decline and the stability of the conventional activated sludge process to suffer.
The MBR process may produce stable effluent even when the influent water quality varies, thanks to its higher sludge concentration and membrane filtration technology. Additionally, the MBR method may achieve a complete separation of HRT and SRT, enhancing the flexibility and stability of operation control.
Conclusion
The MBR effluent's quality can satisfy the strictest brewery wastewater reuse or disposal regulations. As a result, the potential application of MBR in the reuse and treatment of brewery wastewater is very extensive.
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