Method and device for treating sewage by combining algae membrane with ultrafiltration membrane

Abstract

The invention discloses a method and device for treating sewage by combining an algae membrane with an ultrafiltration membrane, and the method comprises the following steps: alternately treating thesewage by utilizing photosynthesis and respiratory action of algae to remove nitrogen and phosphorus in the sewage; then suspended algae precipitate in the effluent is removed by using a flocculatingagent, and suspended matters and water are further separated by using an ultrafiltration membrane, so that the effluent quality is improved. The device is formed by sequentially connecting a raw watertank, a tubular algae membrane system, an ultrafiltration membrane system and a water outlet tank according to the water flow direction, wherein the tubular algae membrane system is formed by alternately connecting light-transmitting tubular reactors and lightproof tubular reactors, and algae membranes can be arranged in the light-transmitting tubular reactors; and the ultrafiltration membrane system consists of a dosing device, a sedimentation tank and an ultrafiltration membrane assembly. When the device is used for treating the sewage according to the method, continuous, high-efficiency and high-quality treatment of the sewage can be realized, the automation degree is high, and the equipment utilization rate is high.

Description

technical field [0001] The invention relates to the technical field of sewage treatment, in particular to a method and a device for treating sewage by using an algae membrane combined with an ultrafiltration membrane. Background technique [0002] With the intensification of my country's urbanization process, the discharge and production of urban sewage are increasing day by day, and the operating load of urban sewage treatment plants is also increasing. In recent years, many sewage treatment plants in China are undergoing new construction, expansion and upgrading to improve the sewage treatment capacity and effluent quality, and reduce the pollution of sewage to the water environment, especially the eutrophication of water caused by nitrogen and phosphorus pollutants in sewage. change. In the process of photosynthesis using light energy, algae can effectively absorb nutrients such as nitrogen and phosphorus in water and generate their own substances. According to this fea...

AI Technical Summary

Problems solved by technology

However, the algae membrane reactor disclosed in the paper "Experimental Research on Nitrogen and Phosphorus Removal of Wastewater in New Algae Membrane Process System" and the algae membrane bioreactor disclosed in the patent CN201310380921.0 are both composed of reactors equipped with algae membranes in series. Sewage treatment is carried out at room temperature and under continuous light conditions with a light intensity of 3000-4500 lx. Algae grow under light for a long time, mature and age quickly, the service life of algae membranes is short, and secondary pollution caused by algae corruption is serious; light energy consumption High and requires frequent treatment of shed algae

In addition, although the algae membrane process system disclosed in the paper "Experimental Research on Nitrogen and Phosphorus Removal of Wastewater by New Algae Membrane Process System" has a good decontamination effect in the laboratory test stage, when it is put into actual sewage treatment, the decontamination effect has declined. , there are many suspended algae in the effluent of the algae membrane reactor, which is easy to block the ultrafiltration membrane, so the algae membrane process system is currently only in the laboratory test stage

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