What is the basic principle of MBR?

MBR refers to a new sewage treatment device that combines ultrafiltration and microfiltration membrane separation technology with bioreactors in sewage treatment. This reactor combines the advantages of membrane treatment and biological treatment technology. The ultrafiltration and microfiltration membrane modules are used as mud-water separation units, which can completely replace the secondary sedimentation tank. Ultra-filtration and micro-filtration membranes trap microbial floc and larger molecular organics in the activated sludge mixed solution, so that they stay in the reactor, so that the reactor obtains high biological concentration, and prolongs the retention time of organic solids, which greatly improves the microorganism Oxidation of organic matter.

MBR’s Features

1) Good effluent quality

The solid-liquid separation equipment is not necessary because of the membrane separation technology. Efficient solid-liquid separation separates the microbial flora that has suspended matter, colloidal matter, and biological units in the wastewater from the purified water, and then the water can be reused directly without tertiary treatment.

2. Small floor space

The concentration of microorganisms maintains a high concentration in the biological treatment unit of the membrane bioreactor, which greatly increases the volume load. The high efficiency of the membrane separation greatly reduces the hydraulic retention time of the treatment unit and reduces the floor area. At the same time, because the membrane bioreactor uses modules. It does not require the sedimentation tank and the special filtration workshop, and the floor space  only occupies 60% of the traditional method.

3.Low operating cost

The MBR's efficient oxygen utilization efficiency and unique intermittent operation mode greatly reduce the operating time, the power consumption of the aeration equipment and power consumption. At the same time, it can save long-term operating costs significantly, which is caused by drug addition and disinfection because the membrane can filter out harmful substances such as bacteria and viruses. The membrane bioreactor process does not require the addition of flocculants that also reduce operating costs.

MBR’s Classification

Membrane bioreactor is composed of membrane module and bioreactor. The classification of membrane bioreactor is determined by the combination of the two parts and the respective properties. MBR can be divided into internal pressure type and external pressure type because the different properties of membrane modules. The internal pressure type of water permeates is from the inside of the membrane to the outside, but the external pressure type is the opposite. In practice, external pressure type MBR is relatively common, because internal pressure type MBR is easy to block.