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Plate membrane reactor as a technology with great energy saving potential
Release time:
2023-01-09
Plate membrane reactor (MABR) is a new type of biological wastewater treatment technology, which has the characteristics of high oxygen mass transfer efficiency and substrate oxygen mass transfer. It has significant advantages in high efficiency nitrogen removal, energy saving and sludge reduction, and has attracted much attention in recent years. In the past 20 years of scientific research, a series of research work has carried out in-depth exploration of the elements of gas mass transfer, material transport and microbial community structure that endanger the actual effect of MABR operation, and has made great progress in process control and optimization, reactor design and improvement, denitrification process model development and simulation planning.
At present, the situation of water pollution in my country is still severe, and the emission standards of nitrogen and other pollutants are becoming more and more stringent, and new high-efficiency nitrogen removal processes are urgently needed. In the last 20 years,plate membraneAs a technology with great energy-saving potential, the reactor is particularly important in the energy-saving and consumption-reducing upgrade of sewage treatment in the future because of its advantages of efficient nitrogen removal and small footprint. In 1972, MABR was used in an oxidative system for cell and tissue culture. According to this result, MABR was proposed and established in 1978, and it was found that the oxidation method coupled with microbial membrane can effectively degrade the organic matter in wastewater. In 1989, Cote et al. proposed the concept of bubble-free aeration and demonstrated the advantages of MABR in terms of gas quality. Based on this outcome, Yamigwa and other institutions developed in 194. With the development and application of MABR, MABR has officially entered more than 20 years of research.
Plate membrane reactor (MABR) is a new type of biological wastewater treatment technology, which has the characteristics of high oxygen mass transfer efficiency and substrate oxygen mass transfer. It has significant advantages in high efficiency nitrogen removal, energy saving and sludge reduction, and has attracted much attention in recent years. In the past 20 years of scientific research, a series of research work has carried out in-depth exploration of the elements of gas mass transfer, material transport and microbial community structure that endanger the actual effect of MABR operation, and has made great progress in process control and optimization, reactor design and improvement, denitrification process model development and simulation planning. With the continuous improvement and all-round application of plate membrane raw materials, MABR technology has excellent prospects for engineering practice activities.
In the traditional blast type activated sludge processing process, 40% ~ 60% of the energy consumption is used to expose the gas, but only 5% ~ 25% of the oxygen can be transmitted to the water, and the remaining gas will escape into the air in the form of bubbles. The MABR system software uses hydrophobic film raw materials to carry out exposure, and oxygen immediately reaches the physical film according to the film diffusion under the effect of oxygen partial pressure difference between the inside and outside of the film. In MABR, oxygen does not have to go through the liquid layer boundary when it is transferred to the surface of the biofilm, so the mass transfer resistance becomes smaller and the oxygen mass transfer rate (OTE) can also be improved. In addition, the oxygen separation of the gas in the MABR is not compromised by the deep liquid phase, and a large oxygen separation can be maintained even in shallow waters. Compared with the traditional type of gas exposure, film aeration does not produce bubbles, so the oxygen scattered over the film can be completely used by the bio-plate membrane, and the high efficiency of oxygen transfer (OTE) can be achieved.CompletelySignificant energy savings. In addition, because the gas phase and liquid phase of MABR are separated in physics, the software of the membrane aeration system can combine the high oxygen utilization rate of bubble-free aeration, and the oxygen supply can be accurately controlled only by adjusting the oxygen partial pressure, which can not only avoid the consumption of gas, but also indirectly control the oxygen process in the film.
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