CN202519135U - Sewage treatment and sludge concentration integrated system - Google Patents

Abstract

The utility model relates to an integrated system of sewage treatment and sludge concentration, which comprises a biological treatment tank and a membrane separation tank connected to a water inlet pipe, a sludge return pipe and a mixed liquid return pipe, the membrane separation tank is connected to a water outlet pipe, and the membrane separation drain The mud pipe is characterized in that an air flotation tank is added between the biological treatment tank and the membrane separation tank, and an integral tank is formed sequentially separated by D and E partition walls. An air flotation contact area is set near the D partition wall in the air flotation tank, and the outside of the air flotation contact area It is an air flotation separation area. The upper part of the air flotation tank is equipped with a slag scraper and a slag discharge tank. The slag tank sludge discharge pipe of the slag discharge tank is connected to the sludge discharge pipe of the slag tank and also connected to the biological treatment tank; the biological treatment tank is connected through the D partition wall channel. The aerated floating pool and the air floatation pool are connected to the membrane separation pool through the E partition wall channel; the air floatation contact area and the air floatation separation area are respectively equipped with air floatation mud discharge pipes. The utility model has the advantages of concentrating and separating suspended sludge in advance, reducing membrane pollution, increasing membrane flux, reducing operating costs, and protecting the environment.

Description

Sewage treatment and sludge concentration integrated system

technical field

The utility model relates to the technical field of sewage treatment, in particular to an integrated sewage treatment and sludge concentration system based on an MBR sewage treatment system. the

Background technique

Membrane Bioreactor (MBR for short) is a new type of sewage treatment technology that combines membrane separation technology and biological treatment technology. It is a new type of sewage treatment system that combines membrane separation units and biological treatment units. After more than 20 years of research, membrane bioreactors have achieved very effective applications in sewage treatment, but there are still the following problems: (1) The high membrane price will make the initial investment of the sewage treatment system too large; (2) ) Severe membrane fouling during operation will lead to high replacement frequency of membrane modules and excessive energy consumption, which will increase operating costs; (3) After sewage treatment, the remaining sludge needs to be transferred to another site for concentration treatment, The structure of the facility is complex, which increases the cost of land occupation. At the same time, during the transportation and treatment process, it causes muddy water and odor emissions, polluting the environment. the

As a sludge concentration process, the air flotation process has the advantages of good mud-water separation efficiency and high concentration of concentrated sludge. Whether the air flotation process can be combined into the membrane bioreactor, and the sludge concentration process can be advanced to improve the operating conditions of the membrane module has become a concern of the industry. the

Utility model content

The main purpose of this utility model is to solve the above problems, on the basis of the traditional MBR sewage treatment system, by adding air flotation facilities between the biochemical treatment facilities and the membrane separation facilities, to provide an integrated system of sewage treatment and sludge concentration, The suspended sludge is concentrated and separated in advance to ensure that the membrane module works under the condition of low sludge concentration, thereby increasing the membrane flux, reducing membrane fouling, reducing membrane investment and operating costs, and protecting the environment. the

The technical scheme that the utility model solves its technical problem adopts is:

An integrated system for sewage treatment and sludge concentration, comprising a biological treatment tank and a membrane separation tank constituting a membrane biological treatment system, the biological treatment tank is provided with an anaerobic zone, an anoxic zone, and an aerobic tank with an aerator inside. area, and connected to the water inlet pipe, sludge return pipe and mixed liquid return pipe, the two ends of the mixed liquid return pipe are respectively connected with the aerobic area and the anoxic area, and the membrane separation tank is equipped with a membrane module, an aeration cleaner and It is provided with a water outlet pipe and a membrane separation sludge discharge pipe, which is characterized in that an air flotation tank connected to an air flotation machine is added between the biological treatment tank and the membrane separation tank, and forms a sequence from the biological treatment tank to the membrane separation tank through the D and E compartments. The integral pool of the three pools separated by the wall, the air flotation pool is provided with an air flotation contact area with a built-in dissolved air releaser surrounded by a wall near the lower part of the D partition wall. The outside of the air flotation contact area is an air flotation separation area. In the air flotation pool The upper part is provided with a slag scraper and a slag discharge tank, the slag tank sludge discharge pipe of the slag discharge tank is connected to the sludge discharge pipe of the slag tank and connected to the anaerobic zone of the biological treatment tank through the sludge return pipe; the biological treatment tank The air flotation tank is communicated with the air flotation tank through the channels set on the D partition wall, and the air flotation tank is connected with the membrane separation tank through the channels set on the E partition wall; air flotation sludge discharge pipes are respectively arranged at the bottom of the air flotation contact area and the air flotation separation area. the

Mud hoppers are respectively arranged in the air flotation contact zone and the air flotation separation zone. the

The channels provided on the D partition wall are a plurality of liquid passage holes horizontally spaced apart at the lower part of the D partition wall. the

The holes provided on the E partition wall are pipes or horizontal notches. the

The air flotation machine is a pressure dissolved air flotation machine, a shallow air flotation machine or a vortex concave air flotation machine. the

The membrane module is a curtain membrane module, a plate membrane module or a tubular filament membrane module. the

The beneficial effects of the utility model are: (1) By introducing the air flotation tank into the traditional MBR tank, the suspended sludge is concentrated and separated in advance, ensuring that the membrane components in the membrane separation tank work under the condition of low sludge concentration, thereby improving the biological treatment tank. Sludge concentration, reduce the chance of contact between membrane modules and pollutants, reduce the degree of pollution of membrane modules, thereby increasing membrane flux, reducing membrane fouling, reducing membrane investment and membrane operating costs; (2) can be separated by air flotation while sewage treatment Sludge concentration is performed on the floating activated sludge to obtain concentrated sludge, and the floating activated sludge does not need to be concentrated again, and can be directly dehydrated, reducing the sludge reflux ratio in the biochemical treatment section and eliminating the need for subsequent The sludge thickening section in the sludge treatment process reduces the impact of the sludge water generated during the sludge thickening process on the influent load of the sewage treatment plant, and the excess sludge discharged can be directly dewatered, which reduces the waste water of the sewage treatment plant. Internal odor emission is conducive to improving the environment. (3) The organic matter content of excess sludge separated by air flotation increases, which strengthens the performance of excess sludge reuse. In a word, with the application of the utility model, the effluent water quality can reach the first-class A standard of the "Pollutant Discharge Standards for Urban Sewage Treatment Plants", BOD, COD, and NH ₃ -N can meet the water quality requirements of Class IV water; the moisture content of concentrated sludge can be reduced to 93 -94%, membrane flux increased by 50%, membrane investment and membrane operation costs are lower than traditional MBR process, especially suitable for urban sewage and some industrial wastewater treatment projects.

Description of drawings

Fig. 1 is the main view structural representation of the utility model;

Fig. 2 is a sectional view taken along line F-F of Fig. 1 . the

In the figure: 1 water inlet pipe, 2 slag tank sludge discharge pipe, 21 sludge return pump, 22 sludge discharge pipe, 23 sludge discharge pump, 24 sludge return pipe, 3 mixed liquid return pipe, 31 mixed liquid return pump, 4 aerators, 5-6 air flotation mud discharge pipes, 51-53 mud buckets, 7 slag discharge tanks, 8 slag scrapers, 9 aeration cleaners, 10 membrane modules, 11 membrane separation mud discharge pipes, 12 outlet pipes , 13 air flotation machine, 131 dissolved air releaser, 14-15 mixer, 16E partition wall channel, 17 enclosure wall, 18D partition wall channel; A biological treatment pool, A1 anaerobic zone, A2 anoxic zone, A 3 aerobic zone , B air flotation pool, B1 air flotation contact area, B2 air flotation separation area, C membrane separation pool, D, E partition wall. the

The utility model is described in detail below in conjunction with accompanying drawing and embodiment. the

Detailed ways

Figures 1 to 2 show an integrated system for sewage treatment and sludge concentration, including a biological treatment tank A and a membrane separation tank C that constitute a membrane biological treatment system. The biological treatment tank A is provided with an anaerobic zone A1, a Oxygen area A2, aerobic area A3 with aerator 4 inside, and connected to water inlet pipe 1, sludge return pipe 24 and mixed liquid return pipe 3, the two ends of mixed liquid return pipe 3 are respectively connected to aerobic area A3 and deficient The oxygen zone A2 is connected, and agitators 14 and 15 are respectively provided in the anaerobic zone A1 and the anoxic zone A2. The above-mentioned membrane separation tank C is provided with a membrane module 10, an aeration cleaner 9 and is provided with a water outlet pipe 12 and a membrane separation sludge discharge pipe 11. The air flotation tank B of the machine 13, and form the integral pool of the three tanks connected by the biological treatment tank A to the membrane separation tank C successively separated by the D and E partition walls. The air flotation contact area B1 surrounded by the built-in dissolved air releaser 131, the outside of the air flotation contact area B1 is the air flotation separation area B2, and the slag scraper 8 and the slag discharge tank 7 are arranged on the upper part of the air flotation tank B, and the slag discharge tank The tank sludge discharge pipe 2 is connected to the sludge discharge pipe 22 of the slag tank through the sludge discharge pump 23, and is connected to the anaerobic zone A1 of the biological treatment tank A through the sludge return pump 21 through the sludge return pipe 24; the above-mentioned biological treatment tank A passes The channel 18 provided on the D partition wall communicates with the air flotation tank B, and the air flotation tank B communicates with the membrane separation tank C through the channel 16 provided on the E partition wall. Air flotation mud discharge pipes 5 and 6 are respectively arranged at the bottom of the air flotation contact zone B1 and the air flotation separation zone B2. the

In order to facilitate the sinking of sludge, mud buckets are respectively provided in the air flotation contact area B1 and the air flotation separation area B2. The mud buckets 52,53 are removed. the

Above-mentioned air flotation machine 13 can adopt commercially available pressure dissolved air flotation machine, shallow layer air flotation machine or vortex concave air flotation machine. In this embodiment, a pressure dissolved air flotation machine is used. As shown in the figure, the water inlet of the pressure dissolved air flotation machine is connected with the air flotation pool B, and its dissolved air releaser 131 extends into the air flotation contact through the air-water output pipe. within zone B1. the

The channels 18 provided on the above-mentioned D partition wall are some liquid passage holes horizontally spaced apart at the lower part of the D partition wall, and the position of the liquid passage holes corresponds to the position of the dissolved air releaser 131, so that the mixed solution that enters is rapidly mixed with the dissolved air. Air-water mixing and contact. The channel 16 provided on the above-mentioned E partition wall can adopt a pipeline or a horizontal gap. In this example, the channel 16 is a horizontal gap provided at the position where the E partition wall is located at the top of the mud bucket 53 . the

The above membrane module 10 may be a curtain membrane module, a plate membrane module or a tubular filament membrane module. In this example, a plate membrane module is used. the

Working process and principle of the utility model:

Referring to Figures 1 to 2, the sewage first enters the biological treatment tank A through the water inlet pipe 1, and then passes through the anaerobic zone A1, the anoxic zone A2, and the aerobic zone A3 for anaerobic, anoxic, and aerobic treatment, and the mixed water after treatment A part of the liquid returns to the anoxic zone A2 through the mixed liquid return pipe 3, and the rest of the mixed liquid enters the air flotation contact area B1 of the air flotation tank B through the D partition wall channel 18, and is fully mixed and contacted with the dissolved air water. The activated sludge in the mixed liquid floats to the liquid surface in the air flotation separation zone B2 to form scum, and then the scum is scraped into the slag discharge tank 7 by the slag scraper 8 at regular intervals, and a part of the sludge is refluxed through the sludge The pump 21 enters the anaerobic zone A1 of the biological treatment tank A through the sludge return pipe 24, and the remaining sludge enters the sludge discharge pipe 22 of the slag tank through the sludge discharge pump 23 and is discharged out of the system. Part of the treated water after the treatment in the air flotation separation zone enters the dissolved air water booster pump and dissolved air tank of the pressure dissolved air flotation machine 13 through the return pipe to form dissolved air water, and then supplies the dissolved air releaser 131 to complete the air flotation Function; the rest of the treated water enters the membrane separation tank C as the effluent of the air flotation tank B through the channel 16 of the E partition wall. The sludge settled in the air flotation tank B is regularly discharged through the sludge discharge pipes 5 and 6; the pollutants separated by the membrane in the membrane separation tank C are regularly discharged through the membrane separation sludge discharge pipe 11 and formed by the aeration cleaner 9 The turbulent aeration flow cleans the pollutants adsorbed by the membrane module 10 in time. the

The sewage treatment and sludge concentration integrated system provided by the utility model is especially suitable for urban sewage treatment projects, and is also suitable for some industrial wastewater treatment projects. In the above sewage treatment process, the biological treatment process in the biological treatment pool A can adopt various sewage treatment processes such as A/O, A ² /O, and point-inflow.

Application effect:

Applying the utility model, when the influent water quality satisfies the standard of "Water Quality Standards for Sewage Discharge into Urban Sewers" (CJ3082-1999), the effluent water quality can reach the first-class A standard of "Pollutant Discharge Standards for Urban Sewage Treatment Plants", BOD, COD , NH ₃ -N meet the water quality requirements of Class IV water; the moisture content of the concentrated sludge is reduced to 93-94%, and the organic matter content of the sludge increases, which enhances the reutilization of the remaining sludge; the membrane flux increases by 50%, and the membrane The cost of investment and membrane operation is lower than that of the traditional MBR process; moreover, it can reduce the emission of odor from sewage treatment plants, which is beneficial to reduce odor pollution.

The above content is not intended to limit any form to the structure and shape of the present utility model. Any simple modifications, equivalent changes and modifications made to the above embodiments according to the technical essence of the present invention still belong to the scope of the technical solution of the present invention. the

Claims (6)

1. WWT and the concentration integrated system of mud; Comprise the biological treatment tank and the membrane sepn pond that constitute the film biological treatment system; Be provided with in the said biological treatment tank anaerobic zone, oxygen-starved area, in establish the aerobic zone of aerator; And connection water inlet pipe, mud return line and mixed-liquor return pipe; The two ends of mixed-liquor return pipe are communicated with the oxygen-starved area with aerobic zone respectively; Said membrane sepn pond is provided with membrane module, aeration cleanser and is provided with rising pipe and the membrane sepn shore pipe, it is characterized in that between said biological treatment tank and membrane sepn pond, setting up the air flotation pool that connects the air supporting machine, and forms the whole pond of being passed through three pond disjunctors of D, the separation of E partition wall by biological treatment tank to membrane sepn pond successively; Said air flotation pool is in the air supporting zone of action that the built-in dissolved air release of being crowded around by enclosure wall is set near D partition wall bottom; Outside, air supporting zone of action is the flotation separation zone, on air flotation pool top slag scraper, ash pit is set, and the slag chute shore pipe of said ash pit connects slag chute mud vent pipe and passes through the anaerobic zone that said mud return line connects biological treatment tank; Said biological treatment tank is communicated with air flotation pool through the duct that is provided with on the D partition wall, and said air flotation pool is communicated with the membrane sepn pond through the duct that is provided with on the E partition wall; Be respectively equipped with the air supporting shore pipe in air supporting zone of action and bottom, flotation separation zone.

2. WWT according to claim 1 and the concentration integrated system of mud is characterized in that in said air supporting zone of action and flotation separation zone, being respectively equipped with bucket.

3. WWT according to claim 1 and the concentration integrated system of mud is characterized in that the some liquid pass holes of duct for offering at interval in D partition wall lower horizontal that are provided with on the said D partition wall.

4. WWT according to claim 1 and the concentration integrated system of mud is characterized in that the duct that is provided with on the said E partition wall is pipeline or horizontal gap.

5. WWT according to claim 1 and the concentration integrated system of mud is characterized in that said air supporting machine is pressure air-dissolving air-float machine, shallow air-floatation machine or air flotation turbo.

6. WWT according to claim 1 and the concentration integrated system of mud is characterized in that said membrane module is curtain type film assembly, plate type membrane component or manages thread membrane module.

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