Features | MBR (Membrane Bio-Reactor) | MBBR (Moving Bed Biofilm Reactor) |
Introduction | Technology that combines 2 processes in one tank: – Activated sludge technology – Separating microbial biomass using membrane | – Technology using substrates for microorganisms to adhere, grow and develop in traditional Aerotank tanks |
Advantages of MBR and MBBR | – Save space, premises, and construction costs – Treated wastewater has low BOD and COD – Easy to increase capacity when expanding scale by increasing sludge concentration and filter area – No need for sedimentation, filtration, or disinfection tanks | – Saves more space than traditional Aerotanks – Microbial density per unit volume is higher than the traditional activated sludge treatment system – Distribute microorganisms more evenly in the treatment tank – Increase the contact area between microorganisms and wastewater – Treated wastewater has low BOD and COD quality – Easy to apply to existing treatment tanks |
| Disadvantages | – The membrane is often clogged – Must use chemicals to clean the membrane (about 6 – 12 months, depending on the nature of the wastewater) | – Needs sedimentation and filtration works behind MBBR – Depending on the quality of the substrate (MBBR), the adhesion ability of microorganisms is different – The substrate is fragile after a period of use |
| Microbiological supplement | MBR and MBBR Always need some additional and maintenance microorganisms | |
| Principle of phosphorus treatment using biological methods | Dephosphorylation in biological systems has the following mechanisms: – Many bacteria have the ability to store excess amounts of phosphorus as polyphosphorus in their cells (these organisms are collectively called PAOs). – Under anaerobic conditions, PAOs will convert fermentation products (such as volatile fatty acids) into stored products inside the cell, and at the same time release phosphorus from stored polyphosphates. – Under aerobic conditions, energy is generated from the oxidation of stored products and then polyphosphate accumulation in the cell increases. – Phosphorus is removed from the process from residual sludge disposal | |
| Phosphorus treatment | The efficiency of the phosphorus treatment system, depending on the input phosphorus concentration, will gradually decrease in the first 2 years. After that, if the input wastewater has high P content, it is necessary to clean the membrane or replace the membrane and continuously withdraw sludge. | The P treatment system is effective, depending on the input phosphorus concentration, the efficiency will gradually decrease in the first 2 years. After that, if the effluent has high P content, it is necessary to continuously withdraw sludge. |
| WAS Sludge Disposal | – MBR simple operation, few problems – WAS mud volume is less than MBBR | – MBBR often has many problems, operates similarly to Aerotank – WAS volume is less than Aerotank. Sludge draining is similar to Aerotank |
| Issues of concern | – How to drain sludge? – What is the volume of sludge withdrawn? – When to drain the sludge? | – Quality of substrate? – Type of substrate? |
| Lifespan | Normally 2 years. (depending on manufacturer) | Normally 2 years. (depending on manufacturer) |
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