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...

Examples

Embodiment

[0055] A device for treating sewage by using an algae membrane combined with an ultrafiltration membrane is formed by connecting a raw water tank 1, a tubular algae membrane system, an ultrafiltration membrane system, and an outlet water tank 9 in sequence according to the direction of water flow. The tubular algae membrane system is formed by alternately connecting transparent tube reactors 3 and opaque tube reactors 4, wherein algae membranes can be arranged in the transparent tube reactors 3 . The ultrafiltration membrane system is composed of a dosing device 5, a sedimentation tank 6, and an ultrafiltration membrane module 8. The dosing device 5 is arranged on the pipeline before the water inlet 18 of the sedimentation tank 6, and the water outlet 14 of the sedimentation tank 6 is connected to the ultrafiltration membrane assembly. The water inlet of the membrane module 8 is connected, and the liquid is sent through the ultrafiltration pump 7 in the middle. A liquid delive...

Embodiment 1

[0084] A method for treating sewage by using an algae membrane combined with an ultrafiltration membrane, comprising the following steps:

[0085] (1) Pretreatment of the carrier: soak the three-dimensional elastic polyvinyl chloride carrier in 0.5mol / L NaHCO 3 After soaking in the solution for 24 hours, rinse it with deionized water for 4 times, soak the obtained carrier in hydrochloric acid with a concentration of 1.0mol / L for 6 hours, rinse it with deionized water for 4 times and dry it, then install it in the light-transmitting tube inside the reactor.

[0086] (2) Algae filming: add BG11 medium into the light-transmitting tube reactor, inoculate Scenedesmus obliquus in the medium with an initial concentration of 1 g / L, mix well and culture statically for 7 days.

[0087] (3) Algae film domestication: After the algae film is basically formed, the sewage to be treated is fed into the transparent tube reactor according to the flow rate of the hydraulic retention time of 4 d...

Embodiment 2

[0091] A method for treating sewage by using an algae membrane combined with an ultrafiltration membrane, comprising the following steps:

[0092] (1) Pretreatment of the carrier: soak the three-dimensional elastic polyvinyl chloride carrier in 0.5mol / L NaHCO 3 After soaking in the solution for 24 hours, rinse it with deionized water for 4 times, soak the obtained carrier in hydrochloric acid with a concentration of 1.0mol / L for 6 hours, rinse it with deionized water for 4 times and dry it, then install it in the light-transmitting tube inside the reactor.

[0093] (2) Algae filming: add BG11 medium into the light-transmitting tube reactor, inoculate Scenedesmus obliquus in the medium with an initial concentration of 1 g / L, mix well and culture statically for 7 days.

[0094] (3) Algae film domestication: After the algae film is basically formed, the sewage to be treated is fed into the transparent tube reactor according to the flow rate of the hydraulic retention time of 6 d...

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...

Examples

Embodiment

[0055] A device for treating sewage by using an algae membrane combined with an ultrafiltration membrane is formed by connecting a raw water tank 1, a tubular algae membrane system, an ultrafiltration membrane system, and an outlet water tank 9 in sequence according to the direction of water flow. The tubular algae membrane system is formed by alternately connecting transparent tube reactors 3 and opaque tube reactors 4, wherein algae membranes can be arranged in the transparent tube reactors 3 . The ultrafiltration membrane system is composed of a dosing device 5, a sedimentation tank 6, and an ultrafiltration membrane module 8. The dosing device 5 is arranged on the pipeline before the water inlet 18 of the sedimentation tank 6, and the water outlet 14 of the sedimentation tank 6 is connected to the ultrafiltration membrane assembly. The water inlet of the membrane module 8 is connected, and the liquid is sent through the ultrafiltration pump 7 in the middle. A liquid delive...

Embodiment 1

[0084] A method for treating sewage by using an algae membrane combined with an ultrafiltration membrane, comprising the following steps:

[0085] (1) Pretreatment of the carrier: soak the three-dimensional elastic polyvinyl chloride carrier in 0.5mol / L NaHCO 3 After soaking in the solution for 24 hours, rinse it with deionized water for 4 times, soak the obtained carrier in hydrochloric acid with a concentration of 1.0mol / L for 6 hours, rinse it with deionized water for 4 times and dry it, then install it in the light-transmitting tube inside the reactor.

[0086] (2) Algae filming: add BG11 medium into the light-transmitting tube reactor, inoculate Scenedesmus obliquus in the medium with an initial concentration of 1 g / L, mix well and culture statically for 7 days.

[0087] (3) Algae film domestication: After the algae film is basically formed, the sewage to be treated is fed into the transparent tube reactor according to the flow rate of the hydraulic retention time of 4 d...

Embodiment 2

[0091] A method for treating sewage by using an algae membrane combined with an ultrafiltration membrane, comprising the following steps:

[0092] (1) Pretreatment of the carrier: soak the three-dimensional elastic polyvinyl chloride carrier in 0.5mol / L NaHCO 3 After soaking in the solution for 24 hours, rinse it with deionized water for 4 times, soak the obtained carrier in hydrochloric acid with a concentration of 1.0mol / L for 6 hours, rinse it with deionized water for 4 times and dry it, then install it in the light-transmitting tube inside the reactor.

[0093] (2) Algae filming: add BG11 medium into the light-transmitting tube reactor, inoculate Scenedesmus obliquus in the medium with an initial concentration of 1 g / L, mix well and culture statically for 7 days.

[0094] (3) Algae film domestication: After the algae film is basically formed, the sewage to be treated is fed into the transparent tube reactor according to the flow rate of the hydraulic retention time of 6 d...

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