CN210215110U - A sewage treatment system for simultaneous and efficient removal of carbon, nitrogen and phosphorus - Google Patents
A sewage treatment system for simultaneous and efficient removal of carbon, nitrogen and phosphorus Download PDFInfo
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Abstract
The utility model provides a sewage treatment system for synchronously and efficiently removing carbon, nitrogen and phosphorus, which comprises a raw water barrel, an anode chamber, a photosynthetic reaction tank and a liquid drawing tank which are sequentially communicated, wherein an anion exchange membrane is arranged between the anode chamber and the photosynthetic reaction tank, and a forward osmosis membrane is arranged between the photosynthetic reaction tank and the liquid drawing tank; an anode is arranged in the anode chamber, and the photosynthetic reaction tank is filled with microalgae suspension; the drawing liquid pool is filled with drawing liquid, a cathode is arranged in the drawing liquid pool, and the cathode is connected with the anode in the anode chamber through an external circuit. The utility model discloses a combine just osmosis technique, little algae nitrogen and phosphorus removal technique and bioelectrochemistry technique, can adjust well osmotic membrane algae source pollution effectively when realizing that sewage takes off carbon nitrogen phosphorus and algae water high-efficient separation in step, the utility model is simple in operation, control is convenient, and sewage treatment is efficient, has wide application prospect.
Description
Technical Field
The utility model relates to a sewage biological treatment technology, in particular to a sewage treatment system for synchronously and efficiently removing carbon, nitrogen and phosphorus.
Background
With the continuous increase of the population number in China and the rapid development of industrial and agricultural production, the discharge of human production and domestic sewage is increasingly increased, a large amount of environmental pollutants are discharged into water bodies, so that the accepting water body environment is accelerated to deteriorate, in recent years, the eutrophication of the water area environment in China shows a trend of accelerated deterioration, and the eutrophication of the surface water body becomes one of the core problems of water pollution in China. The pollutants of nitrogen, phosphorus and the like in the water body are key factors causing eutrophication of the water body, the discharge of a large amount of sewage containing nitrogen and phosphorus is a main reason causing the increase of the concentration of the pollutants of nitrogen and phosphorus in the received water body, and the research and development of an economical and efficient nitrogen and phosphorus removal technology becomes one of important tasks for solving the problem of water pollution in China.
At present, the widely adopted denitrification and dephosphorization process of the sewage plant in China is A2The conventional nitrogen and phosphorus removal processes are mature in technology and stable in process, but still have a series of problems of poor simultaneous nitrogen and phosphorus removal effect, high investment and operation cost, low recycling rate and the like. Algae can effectively absorb nutrients such as nitrogen and phosphorus in a water body through photosynthesis, can effectively remove nitrogen and phosphorus while finishing the growth and metabolism of the algae, and in addition, microalgae has high oil content and high growth rate and is considered as a biodiesel raw material with the most development prospect.
The microalgae is utilized to treat sewage, the high-efficiency removal of nitrogen and phosphorus in the sewage and the harvesting of microalgae biomass can be synchronously realized, however, microalgae cells are small in individual, the density is close to that of water, the surface of the microalgae cells is negatively charged, the microalgae cells are in a stable suspension state in the water due to the characteristics, the microalgae cells are difficult to naturally separate like activated sludge through gravity precipitation, the algae cells are not completely separated from the water, and the treatment effect and the stability of a system are influenced. In addition, most microalgae belong to autotrophic organisms, so the capacity of removing organic pollutants is limited, and the growth of the microalgae can be inhibited when the concentration of organic matters is too high, therefore, the microalgae sewage treatment system is often used as a post-unit of an aerobic secondary sewage treatment system, used for removing nitrogen and phosphorus in secondary effluent, microalgae sequentially utilizes nitrogen sources such as ammonia nitrogen, organic nitrogen, nitrate nitrogen and nitrite nitrogen, the nitrogen source in urban sewage mainly exists in the forms of ammonia nitrogen and organic nitrogen, the sewage is treated by a secondary aerobic system, more than 90 percent of ammonia nitrogen and organic nitrogen are oxidized into nitrate nitrogen or nitrite nitrogen which is not easy to be utilized by algae, therefore, the denitrification efficiency of the microalgae treatment system is reduced, and meanwhile, a large amount of toxic and harmful substances exist in the sewage, so that the activity and the fertility of the microalgae are reduced, and the nitrogen and phosphorus removal efficiency of the system is also influenced.
Combine together membrane filtration technique and little algae sewage treatment technique, can effectively solve the problem that the algae-laden water separation that traditional little algae sewage treatment technique exists is difficult and the biomass is low, however traditional ultrafiltration and microfiltration membrane can not realize effectual holding back to pollutants such as organic matter and nitrogen phosphorus nutritive salt of low molecular weight, and when little algae was not good to the pollutant removal effect in the system, it can receive the influence to go out water quality. In addition, the ultrafiltration and microfiltration membranes must be driven by external pressure to separate algae and water, which not only results in high operation cost but also causes serious membrane pollution, further increasing the operation and maintenance cost of the system.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a sewage treatment system that synchronous high efficiency of carbon nitrogen phosphorus was got rid of to little algae activity is low in solving current little algae sewage treatment system, and nitrogen phosphorus gets rid of inefficiency, is arranged in the traditional membrane filtration technology of algae moisture serious and costly problem of membrane pollution.
The utility model aims at realizing through the following technical scheme: a sewage treatment system for synchronously and efficiently removing carbon, nitrogen and phosphorus comprises a raw water barrel, an anode chamber, a photosynthetic reaction tank and a liquid drawing tank which are sequentially communicated, wherein an anion exchange membrane is arranged between the anode chamber and the photosynthetic reaction tank, and a forward osmosis membrane is arranged between the photosynthetic reaction tank and the liquid drawing tank;
an anode is arranged in the anode chamber, and anaerobic bacteria and electrogenesis bacteria are attached to the surface of the anode; an anode chamber water inlet pipe and an anode chamber water outlet pipe are arranged on the anode chamber, the anode chamber water inlet pipe is communicated with the raw water barrel, and the anode chamber water outlet pipe is communicated with the photosynthetic reaction tank;
the photosynthetic reaction tank is filled with microalgae suspension, and the bottom of the photosynthetic reaction tank is provided with an aeration device;
the drawing liquid pool is filled with drawing liquid, a cathode is arranged in the drawing liquid pool, the cathode is connected with an anode in the anode chamber through an external circuit, and a load is arranged on the external circuit; the liquid-drawing pool is provided with an on-line conductivity adjusting device, and the top of the liquid-drawing pool is provided with a liquid-drawing pool water outlet pipe.
The anode is made of carbon cloth, carbon felt, carbon paper, carbon brush or graphite plate and is arranged in the middle of the anode chamber.
And a water inlet pump is arranged between the anode chamber water inlet pipe and the raw water barrel, a liquid level controller is arranged at the top of the photosynthetic reaction tank and electrically connected with the water inlet pump, and the liquid level controller is used for monitoring the liquid level of the photosynthetic reaction tank and controlling the operation of the water inlet pump according to the height of the liquid level.
The aeration device is connected with the air pump and used for providing carbon dioxide to the photosynthetic reaction tank and enabling the microalgae suspension to be completely mixed.
The negative pole of drawing the liquid pond adopts carbon cloth or carbon paper to make, and the negative pole setting is drawn the liquid pond and is scribbled carbon-based layer and polytetrafluoroethylene layer in the lateral air's of negative pole face, and the negative pole face scribbles the Pt/C catalyst layer to the one side of drawing the liquid.
The utility model disclosesHas the advantages that: the utility model discloses anode chamber, photosynthetic reaction pond that set up and draw the liquid pond and play the effect of degradation organic matter, nitrogen and phosphorus removal and algae-laden water separation respectively, and the synchronous high efficiency of carbon nitrogen phosphorus in the sewage is got rid of can realizing to three reacting chamber combined action. The electrogenesis microorganism in the anode chamber can effectively degrade organic matters in the sewage and generate electric energy, meanwhile, the anaerobic environment of the anode chamber can prevent ammonia nitrogen in the sewage from being oxidized into nitrate nitrogen which is not easy to be utilized by algae, the microalgae metabolism in the photosynthetic reaction tank can realize the efficient removal of nitrogen and phosphorus pollutants in the sewage, and the interception effect of the forward osmosis membrane can enable the algae water to be efficiently separated so as to finally realize the high-quality water of the system. In addition, the internal electric field generated between the anode material and the cathode material can generate electric stimulation to microalgae cells, the activity of microalgae can be effectively improved, the pollutant removal efficiency is improved, and the electric field can drive NO which is not completely removed in the photosynthetic reaction tank3 -And NO2 -Enters the anaerobic anode chamber through the anion exchange membrane to be further removed. The electric field generated between the anode and the cathode can drive the membrane surface pollutants attached to the surface of the forward osmosis membrane to separate from the surface of the forward osmosis membrane, so that the occurrence of membrane pollution is slowed down.
The utility model discloses a combine just osmosis technique, little algae nitrogen and phosphorus removal technique and bioelectrochemistry technique, can adjust well osmotic membrane algae source pollution effectively when realizing that sewage takes off carbon nitrogen phosphorus and algae water high-efficient separation in step, the utility model is simple in operation, control is convenient, and sewage treatment is efficient, has wide application prospect, provides an effectual approach for the high-efficient of carbon nitrogen phosphorus pollutant in sewage is got rid of.
Drawings
FIG. 1 is a schematic structural view of the sewage treatment system of the present invention.
In the figure: 1-raw water barrel; 2-a water inlet pump; 3-anode chamber; 4-water inlet pipe of anode chamber; 5-an anode; 6-anode chamber water outlet pipe; 7-anion exchange membrane; 8, a photosynthetic reaction tank; 9-an aeration device; 10, an air pump; 11-liquid level controller; 12-a forward osmosis membrane; 13-liquid drawing pool; 14-a water outlet pipe of the liquid drawing pool; 15-a cathode; 16-an on-line conductivity regulating device; 17-a wire; 18-load.
Detailed Description
As shown in figure 1, the integrated forward osmosis membrane-photosynthetic bioelectrochemical system for synchronously and efficiently removing carbon, nitrogen and phosphorus in sewage comprises a raw water barrel 1, an anode chamber 3, a photosynthetic reaction tank 8 and a liquid drawing tank 13 which are sequentially communicated; the anode chamber 1, the photosynthetic reaction tank 8 and the liquid drawing tank 13 are arranged in parallel side by side, the anode chamber 1 and the photosynthetic reaction tank 8 are separated by an anion exchange membrane 7, and the photosynthetic reaction tank 8 and the liquid drawing tank 13 are separated by a forward osmosis membrane 12. In this embodiment, the raw water tank 1, the anode chamber 3, the photosynthetic reaction tank 8 and the liquid drawing tank 13 are all made of organic glass, the volumes of the anode chamber 3, the photosynthetic reaction tank 8 and the liquid drawing tank 13 are 5L, 5L and 2.5L respectively, the lengths, widths and heights of the anode chamber 3 and the photosynthetic reaction tank 8 are 18cm, 10cm and 28cm respectively, and the lengths, widths and heights of the liquid drawing tank 13 are 18cm, 5cm and 28cm respectively.
An anode 5 is arranged in the anode chamber 3, and anaerobic bacteria and electrogenesis bacteria are attached to the surface of the anode 5, wherein the anaerobic bacteria are denitrifying bacteria and the like; an anode chamber water inlet pipe 4 and an anode chamber water outlet pipe 6 are respectively positioned on the lower part of the left side wall and the upper part of the right side wall of the anode chamber 1, the water inlet end of the water inlet pump 2 is connected with the water outlet pipe of the raw water barrel 1, and the water outlet end of the water inlet pump 2 is connected with the anode chamber water inlet pipe 4. The anode material is made of carbon cloth, carbon felt, carbon paper, carbon brush or graphite plate, and the anode is arranged at the central axis of the anode chamber.
The photosynthetic reaction tank 8 is filled with microalgae suspension, and the bottom of the photosynthetic reaction tank 8 is provided with an aeration device 9; the aeration device 9 is connected with an air pump 10, and the aeration device 9 is used for providing carbon dioxide to the photosynthetic reaction tank 8 and completely mixing the microalgae suspension. The top of the photosynthetic reaction pool is provided with a liquid level controller (liquid level relay) 11, the liquid level controller 11 is electrically connected with the water inlet pump 2, and the liquid level controller 11 is used for monitoring the liquid level of the photosynthetic reaction pool 8 and controlling the operation of the water inlet pump 2 according to the height of the liquid level.
The liquid drawing pool 13 is filled with drawing liquid, a cathode 15 is arranged in the liquid drawing pool 13, the cathode 15 is connected with the anode 5 in the anode chamber through a lead 17, and a load 18 is arranged on the lead 17. The cathode 15 is positioned on the side wall of the liquid drawing pool and opposite to the forward osmosis membrane 12, and the cathode 15 can be made of carbon cloth or carbon paper coated with a waterproof breathable layer and a catalyst layer. The distance between the anode 5 and the cathode 15 was 17 cm. The draw solution pool 13 is provided with an on-line conductivity adjusting device 16, a probe of the on-line conductivity adjusting device 16 is immersed in the draw solution, the conductivity of the draw solution is monitored on line, the adding amount of the high-concentration draw solution is controlled to adjust the conductivity of the draw solution in the draw solution pool, and the conductivity is maintained in a specified range. A liquid drawing pool water outlet pipe 14 is arranged at the top of the liquid drawing pool.
The utility model discloses during the application, the sewage that intake pump 2 contains organic matter, ammonia nitrogen and phosphorus in former cask 1 squeezes into anode chamber 3 through anode chamber inlet tube 4, 5 adnexed ordinary anaerobes of positive pole in the anode chamber 3 and the partial organic matter degradation of electricity generation fungus in with the sewage, and electricity generation fungus produces the electron and transmits the electron to the anode material in the while of degradation organic matter, and then transmits to negative pole 15 through outer circuit and form the electric current, forms interior electric field between positive pole 5 and negative pole 15.
The chlorella in the photosynthetic reaction pool 8 is subjected to photosynthesis under the illumination condition to consume ammonia nitrogen and phosphorus in the sewage, so that the nitrogen and phosphorus can be effectively removed. In addition, NO that is not completely removed in the photosynthetic reaction tank 83 -And NO2 -Enters the anaerobic anode chamber 3 through the anion exchange membrane 7 under the action of the electric field force and is further removed under the action of denitrifying bacteria. The air pump 10 pumps air into the photosynthetic reaction tank 8 through the aeration device 9 at the bottom of the photosynthetic reaction tank 8, and the aeration can provide CO for the microalgae2The microalgae suspension system has the advantages that microalgae mixed liquid is ensured to be in a complete mixing state, microalgae is prevented from sinking, meanwhile, the disturbance effect of the microalgae suspension system can promote the contact between pollutants and the microalgae, and the pollutant removal efficiency is improved.
The hydrone in the photosynthetic reaction pond 8 draws the drive of liquid osmotic pressure effect and permeates forward osmosis membrane 12 and get into and draw liquid pond 13 in drawing liquid pond 13 down, realizes the overflow water outlet through drawing liquid outlet pipe 14, and forward osmosis membrane 12 can high-efficiently hold back organic matter and pollutants such as nitrogen phosphorus nutritive salt that do not get rid of in the photosynthetic reaction pond 8, guarantees high-quality play water. In the operation process, pollutants with negative charges such as microalgae cells and microalgae extracellular organic matters can adhere and deposit on the surface of the forward osmosis membrane 12 to cause membrane pollution, and the membrane water flux is influenced, and the electric field generated between the anode 5 and the cathode 15 in the system can enable the key membrane pollutants with negative charges to be subjected to the electric field force far away from the direction of the membrane surface, thereby playing the role of inhibiting the membrane pollution. In addition, the action of the electric field can stimulate the metabolic activity of the microalgae and strengthen the removal of nitrogen and phosphorus nutritive salts by the microalgae. The microalgae collected by the system can be used for preparing biodiesel, and the resource utilization of pollutants in sewage is realized.
Claims (5)
1. A sewage treatment system for synchronously and efficiently removing carbon, nitrogen and phosphorus is characterized by comprising a raw water barrel, an anode chamber, a photosynthetic reaction tank and a liquid drawing tank which are sequentially communicated, wherein an anion exchange membrane is arranged between the anode chamber and the photosynthetic reaction tank, and a forward osmosis membrane is arranged between the photosynthetic reaction tank and the liquid drawing tank;
an anode is arranged in the anode chamber, and anaerobic bacteria and electrogenesis bacteria are attached to the surface of the anode; an anode chamber water inlet pipe and an anode chamber water outlet pipe are arranged on the anode chamber, the anode chamber water inlet pipe is communicated with the raw water barrel, and the anode chamber water outlet pipe is communicated with the photosynthetic reaction tank;
the photosynthetic reaction tank is filled with microalgae suspension, and the bottom of the photosynthetic reaction tank is provided with an aeration device;
the drawing liquid pool is filled with drawing liquid, a cathode is arranged in the drawing liquid pool, the cathode is connected with an anode in the anode chamber through an external circuit, and a load is arranged on the external circuit; the liquid-drawing pool is provided with an on-line conductivity adjusting device, and the top of the liquid-drawing pool is provided with a liquid-drawing pool water outlet pipe.
2. The sewage treatment system for synchronously and efficiently removing carbon, nitrogen and phosphorus according to claim 1, wherein the anode is made of carbon cloth, carbon felt, carbon paper, carbon brush or graphite plate, and is arranged in the middle of the anode chamber.
3. The sewage treatment system for synchronously and efficiently removing carbon, nitrogen and phosphorus according to claim 1, wherein a water inlet pump is arranged between the anode chamber water inlet pipe and the raw water barrel, a liquid level controller is arranged at the top of the photosynthetic reaction tank and electrically connected with the water inlet pump, and the liquid level controller is used for monitoring the liquid level of the photosynthetic reaction tank and controlling the operation of the water inlet pump according to the liquid level height.
4. The sewage treatment system for synchronously and efficiently removing carbon, nitrogen and phosphorus according to claim 1, wherein the aeration device is connected with an air pump and is used for providing carbon dioxide to the photosynthetic reaction tank and completely mixing the microalgae suspension.
5. The sewage treatment system for synchronously and efficiently removing carbon, nitrogen and phosphorus according to claim 1, wherein a cathode of the liquid drawing pool is made of carbon cloth or carbon paper, the cathode is arranged in a side wall of the liquid drawing pool opposite to the forward osmosis membrane, one surface of the cathode facing to outside air is coated with a carbon base layer and a polytetrafluoroethylene layer, and one surface of the cathode facing to the liquid drawing pool is coated with a Pt/C catalyst layer.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921141398.5U CN210215110U (en) | 2019-07-19 | 2019-07-19 | A sewage treatment system for simultaneous and efficient removal of carbon, nitrogen and phosphorus |
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| CN201921141398.5U CN210215110U (en) | 2019-07-19 | 2019-07-19 | A sewage treatment system for simultaneous and efficient removal of carbon, nitrogen and phosphorus |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110240367A (en) * | 2019-07-19 | 2019-09-17 | 河北大学 | A sewage treatment system and method for simultaneous and efficient removal of carbon, nitrogen and phosphorus |
| CN113024029A (en) * | 2021-03-12 | 2021-06-25 | 徐州工程学院 | Integrated MFC-DMBR coupling device |
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2019
- 2019-07-19 CN CN201921141398.5U patent/CN210215110U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110240367A (en) * | 2019-07-19 | 2019-09-17 | 河北大学 | A sewage treatment system and method for simultaneous and efficient removal of carbon, nitrogen and phosphorus |
| CN110240367B (en) * | 2019-07-19 | 2024-03-12 | 河北大学 | Sewage treatment system and method for synchronous and efficient removal of carbon, nitrogen and phosphorus |
| CN113024029A (en) * | 2021-03-12 | 2021-06-25 | 徐州工程学院 | Integrated MFC-DMBR coupling device |
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