With ever growing population and strong urbanisation worldwide, proper management of our water resources is a key priority for the long-term well-being of populations, industries and to safeguard our fragile ecosystems.
For decades conventional systems for wastewater treatment were generally performed by the means of Conventional Activated Sludge (CAS) or Sequential Batch Reactors (SBR) systems. These processes performed by gravity separation or clarification and sand filtration as a means of generating a secondary treatment standard are known for their fragility, unreliability, and operating complexity.
Many countries are now upgrading their environmental regulations relating to the discharge of treated waste waters, and enforcing stringent standards advocating for water re-use for municipalities and industrials. Such discharge standards in most cases cannot be achieved with conventional systems.
A modern, cost-effective, and most efficient technology known as membrane bioreactor (MBR) overcomes these operational problems while at the same time generates effluent standards well below the world’s most stringent discharge standards.
MBR technology combines a solid-liquid separation ultrafiltration membrane module together with an activated biological sludge process.
It combination of process and technology delivers many advantages for the future of wastewater treatment:
High Effluent Quality: Using semi-permeable ultrafiltration membranes for separation can effectively retain all micro-pollutants, bacteria, viruses, and macromolecules in the bioreactor and are subjected to a much longer biological treatment.
The produced effluent can be directly reused or safely discharged in our environment.
Smaller Footprint: Efficient MBR ultrafiltration membranes are used in place of large secondary clarifiers, therefore reducing the required space by ½ to ¼ of CAS plants. The MBR system can operate at very high levels of MLSS (mixed Liquor Suspended Solids), generally in the order of 5,000- 18,000 mg/l, compared with a conventional system which has to operate at circa 3,500-5,000 mg/l.
Therefore, this is excellent for implementation in dense area or also for retrofitting conventional plants requiring additional capacity without extending their footprint.
High stability: MBR system is extremely versatile, and can maintain stable operation across a wide range of conditions and feed water’s fluctuations: with the ability to operate consistently at 5,000-18,000mg/l means that proportional increases in COD/BOD loads can be tolerated and treated.
Lower Sludge, lower Disposal Costs: With higher MLSS concentrations, the bioreactor can create a long sludge age (SRT), therefore longer biodegradation process, which will substantially lower the sludge removed out of the system which has to be disposed from site.
The MBR MEGAPACK™ modules available either in Hollow Fibre (HMBR) or Flat Sheet (FMBR) MBR membranes have a porosity of only 0.2µm which is significantly smaller than conventional sand filtration which will typically capture solids bigger than 30-50µm.
Simple Operation: Since the final effluent quality is achieved by mechanical filtration, monitored by membrane pressures and controlled by a PLC there is no necessity for carrying out daily Sludge Volume Index tests, as it would the case for conventional systems.
Low Cost: Although MBR systems, were believed in the past to be more costly than conventional systems, however with the technology becoming more mainstream in recent years, equipment cost have substantially reduced, and it is now demonstrated that the simplicity of maintenance and operation results in lower operating expenses (OPEX) than in conventional. Altogether the total cost of an MBR system is now sensibly similar to a conventional system.
Since 1999, MegaVision Membrane is a pioneer R&D, manufacturer, and supplier of MBR systems. It is the largest integrated manufacturer of flat sheet and hollow fiber MBR technologies in China. Their novel membranes have been applied worldwide to various wastewater treatment applications ranging from sewage municipal wastewater, industrial effluent from oil & gas, textile, pulp & paper, pharmaceutical, beverage & dairy, as well as residential grey water.
Visit the company’s site for more information: https://megavision-membrane.com