Efficient purification device for municipal tail water

Abstract

The utility model discloses an efficient purification device for municipal tail water, which relates to the field of water treatment and comprises a treatment box, a water supply channel is arranged on the left side of the treatment box, a water inlet pipe is connected to the left side of the water supply channel, a water supply pipe is connected to the bottom of the water supply channel, and a flotation object outlet channel is arranged on the right side of the treatment box. A slag scraper is connected to the top of the treatment box, a slag discharge pipe is connected to the bottom of the flotation object outlet channel, a partition plate is connected into the treatment box, an air flotation chamber is arranged on the left side of the partition plate, and a microbubble generator is arranged in the air flotation chamber. The membrane filtration unit and the air floatation unit are integrated, the occupied area is small, and the process is short; the air floatation unit effectively removes suspended matters, algae and the like, and reduces pollution of the ceramic membrane; advanced treatment of the ceramic membrane can reduce the dosage of an air flotation unit, and low-drug greenization is realized. A biological membrane is constructed on the surface of the ceramic membrane in situ, and dissolved organic matters are deeply degraded; high-precision filtration of the ceramic membrane is utilized, so that high quality of effluent water is ensured.

Description

Technical Field

[0001] The utility model relates to the field of water treatment, in particular to a municipal tail water high-efficiency purification device. Background Art

[0002] The amount of water used by urban water supply plants can reach 5-10% of the water output depending on the production situation. It is mainly generated from the sludge discharge of sedimentation tanks and filter tanks, backwashing of activated carbon filters, backwashing of membrane tanks, etc. Research and development of water supply plant production wastewater treatment and reuse technology is of great significance for urban water plants to achieve pollution reduction, water resource conservation, and water supply security.

[0003] Since production wastewater is enriched with a variety of harmful and toxic substances that affect the effluent quality, including a large amount of suspended solids, colloids, organic matter and microorganisms, as well as coagulants added during the production process, the harmful and toxic substances must be effectively removed before reuse.

[0004] At present, the research on the treatment and reuse technology of municipal water plant production wastewater is relatively weak at home and abroad. The commonly used reuse treatment technologies are mainly concentrated in coagulation-sedimentation, flotation and membrane treatment, as follows:

[0005] (1) Coagulation-sedimentation technology

[0006] Coagulation-sedimentation technology is the most commonly used technology for treating industrial wastewater, which is to collect industrial wastewater into a concentration tank, discharge or reuse the supernatant after coagulation and sedimentation. The coagulation-sedimentation method has low operating costs, but requires a high one-time investment in structures. Since the coagulation process has a weak ability to remove small molecular organic matter, soluble pollutants and microorganisms, wastewater reuse will send pollutants back into the water production link. Simple coagulation-sedimentation is difficult to meet the requirements for wastewater reuse treatment;

[0007] (2) Flotation method

[0008] Air flotation is a treatment method that allows suspended matter to rise to the surface of the water by attaching bubbles, thereby separating water and suspended matter. The air flotation process has a good removal effect on low-density particles and algae, has a strong adaptability to coagulant dosage and water quality changes, and has stable effluent quality. However, the air flotation process equipment is complex, the equipment operation process has many control parameters, high maintenance costs, complex operations, high one-time investment, and poor removal effect on soluble pollutants and microorganisms;

[0009] (3) Membrane treatment technology

[0010] The main working mechanism of membrane treatment technology is mechanical screening. According to different membrane separation pore sizes and pressure drives, membranes are divided into microfiltration, ultrafiltration, nanofiltration and reverse osmosis filtration technologies. Studies have shown that compared with traditional water treatment processes, membrane technology can remove most of the suspended solid particles, microorganisms, Giardia and Cryptosporidium in water, without causing increased turbidity in factory water or an increase in disinfection precursors. It has the advantages of small footprint, high degree of automation and good treatment effect. However, if the production wastewater is directly treated by membrane, the load is large, frequent backwashing is required, and the energy consumption is high. Therefore, it is necessary to pretreat the wastewater before the membrane treatment unit to prevent membrane pollution and increase the overall water production rate of the water plant. The main pretreatment processes include coagulation, carbon adsorption and ozone oxidation.

[0011] From the above analysis, it can be seen that the commonly used technologies such as coagulation sedimentation, flotation and membrane treatment have the disadvantages of poor removal effect of soluble pollutants and microorganisms and high investment when used for wastewater treatment in water plants.

[0012] Therefore, it is necessary to invent a municipal tail water efficient purification device to solve the above problems. Utility Model Content

[0013] The purpose of the utility model is to provide a municipal tail water high-efficiency purification device to solve the problems raised in the above background technology.

[0014] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a municipal tail water high-efficiency purification device, comprising a treatment box, a water supply channel is arranged on the left side of the treatment box, a water inlet pipe is connected to the left side of the water supply channel, a water supply pipe is connected to the bottom of the water supply channel, a flotation outlet channel is arranged on the right side of the treatment box, a scraper is connected to the top of the treatment box, a slag discharge pipe is connected to the bottom of the flotation outlet channel, a partition is connected inside the treatment box, a flotation chamber is arranged on the left side of the partition, a microbubble generator is arranged in the flotation chamber, the water supply pipe is connected to the flotation chamber, a membrane treatment chamber is arranged on the right side of the partition, a ceramic membrane assembly is arranged in the membrane treatment chamber.

[0015] Preferably, a sealing cover is connected inside the water supply channel.

[0016] Preferably, the ceramic membrane assembly includes a plurality of brackets, a plurality of ceramic flat membranes are connected between the plurality of brackets, a water pump is connected inside the bracket, one end of the water pump is connected to a pump, the top of the pump is connected to a water guide pipe, the other end of the water guide pipe is connected to a water outlet pipe, the left side of the water outlet pipe is connected to a return pipe, the bottom of the return pipe is connected to a diversion pipe, the side wall of the diversion pipe is connected to a plurality of water supply pipes, the other end of the water supply pipe is connected to the ceramic flat membrane, the top of the water outlet pipe is connected to a drain pipe, the outer wall of the water outlet pipe is connected to a first valve, and the outer wall of the return pipe is connected to a second valve.

[0017] Preferably, a flotation material guide plate corresponding to the scraper is connected to the processing box.

[0018] Technical effects and advantages of the utility model:

[0019] The membrane filtration unit and the flotation unit are integrated into one, with a small footprint and a short process. The flotation unit can effectively remove suspended matter and algae, reducing ceramic membrane pollution. The deep treatment of the ceramic membrane can reduce the dosage of the flotation unit reagents and achieve low-drug greening. A biofilm is constructed in situ on the surface of the ceramic membrane to deeply degrade soluble organic matter. The ceramic membrane is used for high-precision filtration to ensure high-quality effluent water quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0021] Figure 2 For this utility model Figure 1 Schematic diagram of the enlarged structure of part A.

[0022] In the figure: 1. treatment box; 2. water supply channel; 3. water inlet pipe; 4. water supply pipe; 5. flotation outlet channel; 6. scraper; 7. slag discharge pipe; 8. partition; 9. ceramic membrane assembly; 91. bracket; 92. ceramic flat membrane; 93. suction pipe; 94. pump; 95. water guide pipe; 96. outlet pipe; 97. return pipe; 98. diversion pipe; 99. water pipe; 910. drainage pipe; 911. first valve; 912. second valve; 10. flotation chamber; 11. microbubble generator; 12. cover; 13. flotation guide plate; 14. membrane treatment chamber. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0024] The utility model provides Figure 1-2 A municipal tail water high-efficiency purification device shown in the figure comprises a treatment box 1, a water supply channel 2 is arranged on the left side of the treatment box 1, a water inlet pipe 3 is connected to the left side of the water supply channel 2, a water supply pipe 4 is connected to the bottom of the water supply channel 2, a flotation outlet channel 5 is arranged on the right side of the treatment box 1, a scraper 6 is connected to the top of the treatment box 1, a slag discharge pipe 7 is connected to the bottom of the flotation outlet channel 5, a partition 8 is connected inside the treatment box 1, a flotation chamber 10 is arranged on the left side of the partition 8, a microbubble generator 11 is arranged in the flotation chamber 10, the water supply pipe 4 is connected to the flotation chamber 10, a membrane treatment chamber 14 is arranged on the right side of the partition 8, a ceramic membrane assembly 9 is arranged in the membrane treatment chamber 14.

[0025] The water in the flotation chamber 10 is treated by using a microbubble generator 11. Under the flotation effect of micro-nano bubbles, the organic pollutants in the sewage are surrounded by micro-nano bubbles to form a dense "foam bed", thereby bringing the suspended matter, colloids and other pollutants in the sewage to the surface of the water to form floccules, which are then separated by the scraper 6;

[0026] The clear liquid at the bottom layer then passes through the built-in ceramic membrane assembly 9 and is sucked by the self-pump 94 to form a negative pressure. The clear liquid exceeds the ceramic flat membrane 92 to further purify the water quality. The clean water produced by filtration is reused for production, and the sludge produced by flotation is discharged to the sludge pool of the existing water plant and is uniformly dehydrated and disposed of by the plant.

[0027] A sealing cover 12 is connected to the water supply channel 2 to prevent overflow caused by excessive water flow.

[0028] The ceramic membrane assembly 9 includes a plurality of brackets 91, a plurality of ceramic flat membranes 92 are connected between the plurality of brackets 91, a water pumping pipe 93 is connected inside the bracket 91, one end of the water pumping pipe 93 is connected to a pump 94, a water guide pipe 95 is connected to the top of the pump 94, the other end of the water guide pipe 95 is connected to a water outlet pipe 96, a return pipe 97 is connected to the left side of the water outlet pipe 96, a shunt pipe 98 is connected to the bottom of the return pipe 97, a plurality of water delivery pipes 99 are connected to the side wall of the shunt pipe 98, the other end of the water delivery pipe 99 is connected to the ceramic flat membrane 92, a drain pipe 910 is connected to the top of the water outlet pipe 96, and the drain pipe 910 is connected to the drain pipe 910. The outer wall of the water pipe 96 is connected to a first valve 911, and the outer wall of the return pipe 97 is connected to a second valve 912. By using the pump 94 to pump water, the water in the treatment box 1 is pumped into the pumping pipe 93, and then enters the water guide pipe 95 through the pumping pipe 93. The first valve 911 on the outlet pipe 96 is closed, and the second valve 912 on the return pipe 97 is opened, so that the water can enter the diversion pipe 98, and then enter the multiple water pipes 99 through the diversion pipe 98, and then enter the ceramic flat membrane 92 through the water pipe 99, and the ceramic flat membrane 92 is used to perform membrane filtration treatment on the water.

[0029] A flotation material guide plate 13 corresponding to the scraper 6 is connected to the processing box 1, which can facilitate the flotation material to be guided.

[0030] Working principle of this utility model:

[0031] Firstly, in view of the fact that the pollutants in the wastewater produced by the water supply plant are mainly composed of colloidal particles, organic pollutants, concentrated metals, microorganisms, algae and other impurities, usually mainly suspended pollutants and soluble pollutants, and the low turbidity, and the fact that the flotation process has a good removal effect on low-density suspended particles and algae, and has a strong adaptability to the dosage of coagulants and changes in water quality, the flotation process generated by the microbubble generator 11 is used to pre-treat the recycled water;

[0032] Then, a ceramic flat membrane 92 with high flux, low operating pressure, high separation accuracy and strong anti-pollution performance is used as a membrane filtration unit to deeply purify the recycled water after flotation treatment. In addition, an immersion working mode is adopted to intercept microorganisms in the water body through the ceramic membrane to construct an in-situ biofilm on the membrane surface, thereby achieving deep degradation of soluble organic pollutants in the water body. The produced water after ceramic membrane filtration can be directly discharged into natural water bodies or used as raw water for water plants.

[0033] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A municipal tail water high efficiency purification device, comprising a treatment tank, characterized in that: A water supply channel is arranged on the left side of the treatment box, a water inlet pipe is connected to the left side of the water supply channel, a water supply pipe is connected to the bottom of the water supply channel, a flotation outlet channel is arranged on the right side of the treatment box, a scraper is connected to the top of the treatment box, a slag discharge pipe is connected to the bottom of the flotation outlet channel, a partition is connected inside the treatment box, a flotation chamber is arranged on the left side of the partition, a microbubble generator is arranged in the flotation chamber, the water supply pipe is communicated with the flotation chamber, a membrane treatment chamber is arranged on the right side of the partition, a ceramic membrane assembly is arranged in the membrane treatment chamber.

2. A municipal tail water high efficiency purification device according to claim 1, characterized in that: A sealing cover is connected inside the water supply channel.

3. A municipal tail water high efficiency purification device according to claim 1, characterized in that: The ceramic membrane assembly includes a plurality of brackets, a plurality of ceramic flat membranes are connected between the plurality of brackets, a water pump is connected inside the bracket, one end of the water pump is connected to a pump, the top of the pump is connected to a water guide pipe, the other end of the water guide pipe is connected to a water outlet pipe, the left side of the water outlet pipe is connected to a return pipe, the bottom of the return pipe is connected to a diversion pipe, the side wall of the diversion pipe is connected to a plurality of water supply pipes, the other end of the water supply pipe is connected to the ceramic flat membrane, the top of the water outlet pipe is connected to a drain pipe, the outer wall of the water outlet pipe is connected to a first valve, and the outer wall of the return pipe is connected to a second valve.

4. A municipal tail water high efficiency purification device according to claim 1, characterized in that: The processing box is connected with a flotation material guide plate corresponding to the scraper.

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