Continuous circulating pipe membrane bioreactor

Abstract

The invention discloses a continuous circulating pipe membrane bioreactor which comprises a reactor body, wherein at least one contact oxidation cabinet is arranged in the reactor body; the contact oxidation cabinet is connected with a circulating pipe membrane group through a water inlet pump; the circulating pipe membrane group at least comprises a pipe membrane and a circulating pump; the pipemembrane and the circulating pump are mutually connected in series through a backflow pipeline to form a circulating loop; a pipe cavity of the pipe membrane is communicated with a concentrate backflow pipe; a filtering cavity on the outer side of the pipe membrane is communicated with a discharge pipe; and when in work, the ratio V1 / V3 of the water inlet flow V1 flowing through the water inlet pump to the filtered clear liquid flow V3 of the circulating pipe membrane group is 2-10, and the ratio V2 / V3 of the circulating flow V2 flowing through the inner cavity of the pipe membrane to the filtered clear liquid flow V3 is 2-50. The pipe membrane bioreactor disclosed by the invention has the advantages of high efficiency in removing organic pollutants, difficulty in polluting a filter membrane and long service life, and is suitable for centralized treatment of domestic sewage of the ocean engineering equipment and ships as well as cities, houses or other people-intensive areas.

Description

technical field [0001] The invention relates to technical equipment for sewage treatment, in particular to a membrane biological reaction device for treating domestic sewage through the combination of biological treatment and membrane separation technology. Background technique [0002] Domestic sewage is the sewage produced in the process of human life and production, and it is the main source of pollution of water bodies. It is mainly feces and washing sewage. Domestic sewage contains a large amount of organic matter, such as cellulose, starch, sugar, etc., and often contains pathogenic bacteria, viruses and parasite eggs. The disorderly discharge of urban residential sewage not only aggravates the shortage of water resources, but also directly affects people's living environment and water pollution; the discharge of domestic sewage from marine engineering platforms and ships seriously affects the marine environment. For this reason, people are also seeking effective ways...

AI Technical Summary

Problems solved by technology

Although the filling density of the hollow fiber membrane in this membrane bioreactor is relatively high, which relatively reduces the cost, in actual use, especially when dealing with high-concentration organic sewage, the hollow fiber membrane bioreactor has encountered many problems: such as the membrane is easy to Contamination and clogging, easy wire breakage, short cleaning cycles, difficult maintenance

Although in the above patents, the membrane modules are placed in a special membrane cabinet, rather than directly placed in the "muddy water" with high pollution concentration in contact with the oxidation cabinet, creating a "clear water" operating environment for the hollow fiber membrane group, The membrane fouling rate can be reduced, but because the membrane diameter of the fiber membrane is about 0.1mm, and it is actually in the working state of dead-end filtration, it is difficult for such a small-sized membrane chamber to form effective turbulence and cross-flow in the tube, and it still cannot effectively solve membrane fouling At the same time, the cleaning of the membrane is also very difficult. In order to ensure the stable permeability of the fiber membrane and slow down the concentration polarization, its work is often intermittent, and the separation flow is small, so it is difficult to improve the treatment efficiency.

[0006] In order to improve the problem of membrane fouling, people began to replace the fiber membrane with tubular membrane research, but this research is still at the theoretical level, and the connection relationship and connection structure between the tubular membrane and the contact oxidation cabinet have not been resolved. Failed to solve technical problems such as the flow rate and flow rate in the tube of the tubular membrane, and the relationship between the flow rate in the tube and the permeation amount

However, if the flow rate and velocity in the tube are too low to form an effective cross-flow velocity in the tube, it is easy to form filter cake deposition in the tube; while the flow rate and flow rate in the tube are too high to reduce the separation efficiency and increase energy consumption.

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