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Application of membrane bioreactor in hospital sewage treatment

Убактысы: 2020-04-16 Hits: 39

1. Working principle of membrane bioreactor


The membrane bioreactor process mainly refers to the technology of wastewater treatment through the organic combination of biotechnology and membrane separation technology. Among them, the membrane separation equipment can intercept the macromolecular organic substances and activated sludge in the biochemical reaction tank, and save the secondary sedimentation tank, so that the concentration of activated sludge can be increased, and the residence time of sludge and hydraulic retention time can be controlled And, the more difficult substances in the reactor will degrade and react. Therefore, compared with the traditional biological treatment method, the membrane separation technology used in the membrane bioreactor process can strengthen the function of the bioreactor, which is one of the new and widely used new technologies for wastewater treatment.


2. Application analysis of MBR in hospital sewage treatment


2.1 The feasibility of the application of membrane bioreactor in hospital sewage treatment


According to studies by many experts and scholars, membrane bioreactors can degrade organic matter in sewage and inactivate pathogenic microorganisms, and then filter water-soluble macromolecular organic substances and suspended matter through the membrane, so that the effluent turbidity can be controlled below 0.2NTU. Its advantages are mainly reflected in the reduction of aerosol emissions and sludge generation, the subsequent use of disinfection unit disinfectant has been reduced, and suspended matter in water will also be reduced, so it will play an important role in hospital sewage treatment.


2.2 Application effect of membrane bioreactor in hospital sewage treatment


The utilization of membrane bioreactor can remove more than 90% of ammonia nitrogen in water, and it has great advantages in impact load resistance. Generally, when the operating conditions are more complicated, MBR shows a stronger ability to remove organic matter than the activated sludge method, and the effluent quality is relatively good and stable, so that the sludge age and hydraulic retention time can be completely separated. In addition, during the filtration of the sludge mixed liquid, the pore size of the membrane is reduced due to the formation of the biological phase sediment layer under the action of the membrane surface.The use of the MBR process can effectively trap pathogenic microorganisms, so it is more stable in removing viruses. It also makes up for the shortcomings of the traditional chlorination disinfection process.


In terms of subsequent disinfection, compared with the activated sludge process, the MBR process can also save a lot of disinfectants, and the goal of microbial inactivation can be achieved within a short time of contact, so the reduction of investment and contact equipment Covering area and reducing the costs associated with the disinfection process are of great significance. In terms of reducing the hazards of disinfection by-products, MBR can ensure that the production of halogenated hydrocarbons is reduced. If the residual chlorine in the water is exhausted, the content of halogenated hydrocarbons will no longer change.


Moreover, the concentration of total halogenated hydrocarbons, monobromodichloromethane, chloroform, etc. will be reduced, which will reduce the lasting and potential harm to the environment and human health. Therefore, the use of MBR process can not only reduce the amount of disinfectant, but also minimize the impact of disinfection by-products on human health and the ecological environment, and can be fully utilized in hospital sewage treatment.


In the application of hospital sewage treatment, the MBR process should take into account the actual characteristics and conditions of the hospital's sewage treatment, and at the same time it is necessary to correctly grasp its working principle to fully remove sewage pollutants, save disinfectant, and reduce the cost of disinfection process. The advantages of reducing disinfectant residues and disinfection by-products are brought into play. Only in this way can it bring more benefits to human health and ecological environment, and also promote the health and sustainable development of the hospital.