CN112174318A - Integrated device of solar photovoltaic power generation combined membrane bioreactor - Google Patents
Integrated device of solar photovoltaic power generation combined membrane bioreactor Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/30—Aerobic and anaerobic processes
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/02—Aerobic processes
- C02F3/12—Activated sludge processes
- C02F3/1236—Particular type of activated sludge installations
- C02F3/1268—Membrane bioreactor systems
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2201/00—Apparatus for treatment of water, waste water or sewage
- C02F2201/009—Apparatus with independent power supply, e.g. solar cells, windpower or fuel cells
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2301/00—General aspects of water treatment
- C02F2301/04—Flow arrangements
- C02F2301/043—Treatment of partial or bypass streams
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2301/00—General aspects of water treatment
- C02F2301/10—Temperature conditions for biological treatment
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/10—Biological treatment of water, waste water, or sewage
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- Life Sciences & Earth Sciences (AREA)
- Biodiversity & Conservation Biology (AREA)
- Microbiology (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
Abstract
The invention belongs to the technical field of membrane bioreactors. The invention discloses an integrated device of a solar photovoltaic power generation combined membrane bioreactor, aiming at solving the problems of impact damage of large aeration quantity to a membrane component, high cost and large energy consumption in the operation process of the existing membrane bioreactor. The device comprises an anoxic tank, an aerobic tank, a membrane component, a heating plate component and a solar photovoltaic power generation unit; the anoxic tank is provided with a liquid inlet pipe, the aerobic tank is positioned at the downstream of the anoxic tank and is communicated with the anoxic tank through a connecting pipe, and liquid in the anoxic tank is drained into the aerobic tank; the heating plate is positioned in the anoxic pond, and the solar photovoltaic power generation unit is connected with the heating plate to provide electric energy to drive the heating plate assembly to release heat; the membrane module is positioned in the aerobic tank, and the aerobic tank is also provided with a water outlet pipe for leading out the water treated by the membrane module. The integrated device of the solar photovoltaic power generation combined membrane bioreactor can improve the protection of the membrane component and reduce the cost and energy consumption.
Description
Technical Field
The invention belongs to the technical field of membrane bioreactors, and particularly relates to an integrated device of a solar photovoltaic power generation combined membrane bioreactor.
Background
In the existing membrane bioreactor, in order to reduce and slow down membrane pollution, a method of adding an adsorbent is usually adopted to remove organic matters, so that the quantity of the organic matters entering a membrane component is reduced, the resistance of a filter cake layer is reduced, and the membrane pollution is reduced. Particularly, when sewage is treated in an environment with lower water temperature in winter, the quality of the effluent water cannot reach the standard due to the reduction of microbial activity and the reduction of the operating efficiency of the reactor, at the moment, more organic matters can be adsorbed and removed by directly utilizing the adsorbent by increasing the addition amount of the adsorbent, so that the effect of adsorbing and treating the organic matters by replacing microorganisms is achieved, and the quality of the effluent water is ensured.
However, as the addition amount of the adsorbent increases, a thick cake layer is inevitably formed on the surface of the membrane, so that the pores of the membrane are blocked, and the membrane fouling process is accelerated. At the moment, the surface of the membrane component is washed with large aeration quantity mainly by virtue of an aeration device positioned right below the membrane component, so that the impact crushing of a cake layer on the surface of the membrane is achieved, and the blockage of membrane holes is relieved. However, in actual operation, it is found that washing the membrane module with a large aeration amount for a long time not only causes direct damage to the membrane module due to aeration impact, for example, the hollow fiber membrane directly causes membrane filament breakage to cause direct failure of the membrane module, but also causes sludge flocs to be broken into a large number of micro particles due to strong impact of aeration impact, and the membrane module is damaged secondarily due to blockage or forced penetration of the large number of micro particles into membrane pores, so that the interception effect of the membrane module is reduced, thereby not only increasing the replacement frequency of the membrane module and improving the maintenance cost, but also increasing energy consumption and increasing the operation cost due to a large aeration amount for a long time.
Disclosure of Invention
In order to solve the problems of impact damage with large aeration amount, high cost and large energy consumption in the operation process of the conventional membrane bioreactor, the invention provides an integrated device of a solar photovoltaic power generation combined membrane bioreactor. The integrated device of the solar photovoltaic power generation combined membrane bioreactor comprises an anoxic tank, an aerobic tank, a membrane component, a heating plate component and a solar photovoltaic power generation unit; wherein the anoxic tank is provided with a liquid inlet pipe for introducing sewage to be treated; the aerobic tank is positioned at the downstream of the anoxic tank and communicated with the anoxic tank through a connecting pipe, and liquid in the anoxic tank is drained into the aerobic tank; the heating plate assembly is positioned in the anoxic pond, and the solar photovoltaic power generation unit is connected with the heating plate assembly to provide electric energy to drive the heating plate assembly to release heat; the membrane module is positioned in the aerobic tank, and the aerobic tank is provided with a water outlet pipe for leading out the water treated by the membrane module.
Preferably, the heating plate assembly comprises a plurality of heating plates, wherein the heating plates are sequentially fixed on the mounting column at intervals in parallel, and each heating plate is provided with a plurality of round holes.
Preferably, the integrated device of the solar photovoltaic power generation combined membrane bioreactor further comprises a baffle plate; the baffle is inserted into the aerobic tank along the vertical direction, and the aerobic tank is divided into a left area and a right area; an upper channel is arranged above the baffle, lower channels are arranged below the baffle, and the upper channel and the lower channels communicate the left area with the right area; the outlet of the connecting pipe is positioned in the left area and points to the lower channel along the horizontal direction, and the membrane assembly is positioned in the right area.
Further preferably, the baffle is movably connected with the aerobic tank and can reciprocate along the vertical direction to adjust the flow area of the lower channel.
Further preferably, the device also comprises a return pipe; the inlet of the return pipe is positioned in the right area, and the outlet of the return pipe is positioned in the anoxic area.
Preferably, the integrated device of the solar photovoltaic power generation combined membrane bioreactor also comprises an aeration device; the aeration device is positioned below the membrane component.
Further preferably, aeration devices are arranged in the anoxic tank and the aerobic tank.
Further preferably, the solar photovoltaic power generation unit is connected with an aeration pump in the aeration device to provide electric energy to drive the aeration pump to operate.
Preferably, the outlet of the liquid inlet pipe is arranged along the horizontal direction and is spaced from the bottom of the anoxic tank.
Preferably, the integrated device of the solar photovoltaic power generation combined membrane bioreactor further comprises a medicament feeding unit; the medicament feeding unit is communicated with the anoxic tank and used for feeding medicaments into the anoxic tank.
Compared with the existing membrane bioreactor, the integrated device of the solar photovoltaic power generation combined membrane bioreactor has the following beneficial effects:
1. in the invention, the anoxic tank and the aerobic tank are arranged and are communicated in a bidirectional circulation manner by virtue of the connecting pipe and the return pipe, so that the liquid flows alternately between the anoxic tank and the aerobic tank. Therefore, the organic carbon in the sewage is utilized by denitrifying bacteria in the anoxic tank, the organic load of a downstream aerobic tank can be reduced, the alkalinity generated by the denitrifying reaction can compensate the requirement of the denitrifying reaction in the aerobic tank on the alkalinity, and meanwhile, the heterotrophic bacteria in the anoxic tank can hydrolyze suspended pollutants such as starch, fiber and carbohydrate and soluble organic matters in the sewage into organic acid, so that macromolecular organic matters are decomposed into micromolecular organic matters, and insoluble organic matters are converted into soluble organic matters, so that when products subjected to anoxic hydrolysis enter the aerobic tank for aerobic treatment, the biodegradability of the sewage can be improved, the oxygen efficiency is improved, the removal effect of organic pollutants remained by denitrifying in the aerobic tank is further promoted, and the final effluent quality is improved.
2. In the invention, the heating plate assembly is arranged in the anoxic pond, and the solar photovoltaic power generation unit is arranged for supplying electric energy. Therefore, under the condition that the solar photovoltaic power generation unit is used for providing clean and cheap electric energy, sewage in the anoxic tank can be preheated at low cost and maintained in a proper medium-temperature and high-temperature anaerobic environment, so that the growth of microorganisms such as methanogens, denitrifying bacteria and the like is facilitated, the whole device can always keep a normal and efficient sewage treatment effect in an external low-temperature environment, the problem that membrane assemblies are polluted due to the fact that a large amount of additives are added to make up the problem of low activity of the microorganisms is thoroughly solved, and energy consumption and cost are greatly reduced. Meanwhile, the round holes are formed in the heating plate, so that the flowing water can be sheared, the water flow is in a turbulent state, the substance mixing degree of an anoxic zone is increased, the mass transfer effect between a substrate and microorganisms in sewage is enhanced, and the effects of degrading organic substances in water and removing nitrate nitrogen through denitrification are facilitated.
3. In the invention, the baffle is arranged in the aerobic tank to form the left area and the right area which are communicated in two directions, so that under the condition that the outlet of the connecting pipe is horizontally arranged, water circulation around the baffle is automatically formed by the pushing of water flow, thereby reducing the hydraulic dead area of the aerobic area, providing mixed contact for preheated sewage and sludge, forming a natural water flow scouring effect on the surface of a membrane and avoiding the formation of a filter cake layer.
4. In the invention, an aeration device is arranged below the membrane component, and a small aeration amount is opened to interact with water circulation on the surface of the membrane component to form cross flow velocity. Therefore, a further scouring effect can be formed on the surface of the membrane component, the efficient interception effect of the membrane component is ensured, the scouring strength of the membrane component can be effectively controlled, the strong impact on sludge flocs on the surface of the membrane component is reduced, and the flocs are kept and are not broken, so that the blockage and secondary damage of broken particles to the membrane component are avoided, the protection and service life of the membrane component are improved, and the cost of the whole sewage treatment is reduced.
Drawings
FIG. 1 is a schematic structural diagram of the integrated device of the solar photovoltaic power generation combined membrane bioreactor in the embodiment.
Detailed Description
The technical solution of the present invention will be described in detail with reference to the accompanying drawings and embodiments.
Referring to fig. 1, the integrated device of the solar photovoltaic combined membrane bioreactor of the present embodiment includes an anoxic tank 1, an aerobic tank 2, a membrane module 3, a heating plate module 4 and a solar photovoltaic power generation unit 5.
The anoxic tank 1 is provided with a liquid inlet pipe 6 for introducing sewage to be treated. Suspended pollutants such as starch, fiber, carbohydrate and the like in sewage and soluble organic matters can be hydrolyzed into organic acid by heterotrophic bacteria growing in the anoxic pond, so that macromolecular organic matters are decomposed into micromolecular organic matters, and insoluble organic matters are converted into soluble organic matters.
The aerobic tank 2 is positioned at the downstream position of the anoxic tank 1 and is communicated with the anoxic tank through a connecting pipe 7. At the moment, the products of anoxic hydrolysis in the anoxic tank 1 can be drained to the aerobic tank 2 for aerobic treatment through the connecting pipe 7, so that the biodegradability of sewage is improved, and the aerobic treatment efficiency is improved. Meanwhile, the aerobic tank can further remove the residual organic pollutants generated by denitrification, thereby improving the quality of the effluent.
The membrane module 3 is located in the aerobic tank 2, and a water outlet pipe 8 is further arranged in the aerobic tank 2 and used for leading out water treated by the membrane module 3, such as a water production tank. The heating plate component 4 is positioned in the anoxic pond 2 and is connected with the solar photovoltaic power generation unit 5, and electric energy is directly obtained through the solar photovoltaic power generation unit 5, so that heat is released to maintain the water temperature of the anoxic pond, and the activity of microorganisms in the anoxic pond is maintained.
At the moment, the water temperature in the anoxic tank can be maintained by releasing heat through the heating plate component, so that the activity of microorganisms in the anoxic tank is maintained, the biological treatment efficiency of the whole membrane bioreactor is maintained, the effluent water quality is ensured, the using amount of the adsorbent can be greatly reduced, a filter cake layer formed on the surface of the membrane is relieved, the large aeration flushing of the filter cake layer on the surface of the membrane component is reduced or even omitted, the protection of the membrane component is improved, and the service life of the membrane component is prolonged. Meanwhile, solar energy is converted into electric energy by the solar photovoltaic power generation unit to supply energy to the heating plate assembly and release heat, so that the pollution of the electric energy obtaining process to the environment can be reduced, the energy consumption cost can be greatly reduced, the low-pollution and low-energy-consumption operation of the whole membrane bioreactor is realized, and the environment protection is improved.
As shown in fig. 1, the heating plate assembly 4 is composed of two heating plates in the present embodiment. Wherein, keep being parallel to each other and the interval is fixed on the erection column between two hot plates, seted up a plurality of round holes simultaneously on each hot plate. At the moment, under the action of two heating plates and a plurality of round holes which are arranged in parallel and at intervals, a temperature gradient field which is uniformly distributed around the heating plates can be formed, so that the temperature of the sewage in the anoxic pond is maintained at (20 +/-5) DEG C, the proper anaerobic temperature is kept, the growth of methane bacteria and denitrification bacteria is promoted, the whole device can stably exert the water treatment effect in the external low-temperature environment, and by means of the round holes arranged on the adjacent heating plates, the shearing effect can be formed on the peripheral water flow, the water flow is in a turbulent flow state, the mixing degree of the sewage in an anoxic zone is improved, the mass transfer effect between matrixes and microorganisms in the sewage is enhanced, and the degradation effect on organic substances in the sewage and the effect of removing nitrate nitrogen by denitrification are improved.
Similarly, in other embodiments, the number and distribution of the heating plates in the heating plate assembly, even the number of the heating plate assembly, can be adjusted according to the volume size and the depth size of the anoxic tank, so that the accurate control of the sewage temperature in the anoxic tank is ensured, and the proper anaerobic temperature is maintained.
Referring to fig. 1, in the aerobic tank of this embodiment, a baffle 9 is further provided. The baffle 9 is inserted and fixed in the aerobic tank 2 along the vertical direction, the aerobic tank 2 is divided into a left area 10 and a right area 11, an upper channel 12 is arranged above the baffle 9, lower channels 13 are arranged below the baffle 9, and the left area 10 is communicated with the right area 11 through the upper channel 12 and the lower channels 13. At the same time, the outlet of the connecting pipe 7 is located in the left zone 10 and directed horizontally to the lower channel 13, while the membrane module 3 is located in the right zone 11.
At the moment, after the sewage in the anoxic tank flows into the aerobic tank through the connecting pipe, the sewage flows into the right zone where the membrane component is located through the lower channel under the action of flowing in the horizontal direction, and the sewage in the right zone flows into the left zone through the upper channel under the pushing action of water flow, so that water circulation circulating around the baffle plate between the left zone and the right zone is formed. Therefore, the hydraulic dead zone of the aerobic zone can be reduced by utilizing water circulation, preheated sewage and sludge are fully mixed and contacted, the biological treatment effect on the sewage is improved, the scouring effect on the surface of the membrane component can be formed by utilizing the water circulation, the formation of a filter cake layer on the surface of the membrane component is reduced or even avoided from the initial stage of operation, the filtering effect of the membrane component is kept, meanwhile, the filter cake layer formed by the deposition of the membrane component on the surface of the membrane component in the long-time filtering process and the scouring operation with large aeration quantity aiming at the filter cake layer in the prior art are avoided, the protection on the membrane component is improved, the service life of the membrane component is prolonged, the energy consumption for scouring with large aeration quantity is saved, and the operation cost of the whole device is reduced.
Preferably, in this embodiment, the baffle is movably and fixedly connected with the aerobic tank. For example, the baffle is designed into a long plate-shaped structure with the length smaller than the depth of the aerobic tank, the inner wall of the aerobic tank is provided with a slot along the vertical direction, and the flow area of the lower channel can be adjusted by changing the fixed position of the baffle in the process of inserting the baffle into the slot. At the moment, the position of the baffle can be adjusted according to the flow of the sewage flowing into the aerobic tank through the connecting pipe, so that the overflowing area of the lower channel is changed, the water circulation strength formed around the baffle is controlled, the water circulation strength can be adjusted according to the forming speed of a filter cake layer on the surface of the membrane under the condition that the preheated sewage and sludge are fully mixed, a continuous and effective stable scouring effect is formed on the surface of the membrane, and the effective continuous work of the membrane module is guaranteed. Similarly, under the condition of low sewage treatment capacity, the flow area of the lower channel can be reduced, so that sewage and sludge are in mixed contact for a long time in the left area, and the sewage treatment effect of microorganisms is kept.
In addition, as shown in fig. 1, a return pipe 14 is provided between the anoxic zone 1 and the right zone 11 in the present embodiment, and an inlet of the return pipe 14 is located in the right zone 11, and an outlet of the return pipe 14 is located in the anoxic zone 1. Therefore, the concentrated solution in the right area can be led back to the anoxic tank by the return pipe, so that the content of microorganisms in the anoxic tank is improved, and the utilization rate of the microorganisms is improved.
Referring to fig. 1, in the integrated device of the solar photovoltaic combined membrane bioreactor of this embodiment, an aeration device 15 is further provided, and the aeration device 15 is distributed at the bottom of the anoxic tank 1 and at the bottom of the left zone 10 and the right zone 11 of the aerobic tank 2. At this time, the aeration device located at the lower position of the membrane module in the right zone can not only provide large aeration amount during the back washing operation of the membrane module, but also continuously provide small aeration amount during the sewage treatment process, so that the cross flow velocity is formed by the interaction of the aeration device and the water circulation formed by the baffle on the membrane surface, and the effect of cleaning the membrane surface by the unidirectional water circulation is further improved.
Meanwhile, compared with the condition that the aeration device in the prior art only provides large aeration quantity to wash the surface of the membrane and impact and crush the sludge flocs, the cross flow effect formed by combining water circulation and small aeration quantity can greatly reduce the impact strength on the sludge flocs, so that the sludge keeps the floc structure, secondary damage to the membrane component caused by crushing and releasing a large amount of micro-particles is avoided, and the protection and the service life of the membrane component are improved.
In addition, be located the aeration equipment in oxygen deficiency pond and good oxygen pond, can provide oxygen, the dissolved oxygen volume in the accurate control sewage, for example, the dissolved oxygen content control in the oxygen deficiency pond is at 0.1 ~ 0.2mg/L, the dissolved oxygen content control in the good oxygen pond is at 3 ~ 4mg/L, thereby guarantee the effective growth and the activity of microorganism, and the bubble that the aeration equipment that is located the anoxic zone formed at the in-process of aeration can upwards flow through the round hole on the hot plate, thereby drive the transition of rivers flow state, thereby make mud be in the suspended state, improve the degree of contact of mud and pollutant, make inside more quick effectual infiltration of dissolved oxygen to granule mud, reach effectual denitrification treatment.
Referring to fig. 1, in the present embodiment, the outlet of the liquid inlet pipe 6 in the anoxic zone 1 is designed to be arranged along the horizontal direction and spaced from the bottom of the anoxic tank 1, for example, at a distance of 5-10 cm from the bottom of the anoxic tank. At this moment, through the export that the level set up the feed liquor pipe, make the sewage that gets into the oxygen deficiency pond flow along the horizontal direction, can avoid along setting up downwards and cause direct impact to the sludge blanket of deposit bottom of the oxygen deficiency pond to make deposit mud float the suspension again and form the secondary with the microorganism and combine, reduce the microorganism to the combination rate and the treatment effect of new inflow sewage, and then reach the combination rate and the treatment effect that improve microorganism and sewage in the oxygen deficiency pond.
Further, referring to fig. 1, in the integrated device of the solar photovoltaic combined membrane bioreactor of the present embodiment, a chemical dosing unit 16 is further provided. Wherein, the agent input unit 16 communicates with the anoxic tank 1 for input agent to the anoxic tank 1, for example, according to actual conditions, the flocculant (iron salt, aluminum salt, etc.) can be added to chemically react with phosphorus in the sewage to form a larger flocculating constituent, and then can be directly filtered and removed by a membrane component in an aerobic zone, thereby completing phosphorus treatment in the sewage and improving the treatment effect on the sewage.
In addition, in this embodiment, no matter the aeration pump in the aeration device, or the peristaltic pump for accurately putting in the medicament putting unit, or the driving pump located in the return pipe is connected with the solar photovoltaic power generation unit, and the solar photovoltaic power generation unit directly supplies electric energy, so that the whole membrane bioreactor obtains the solar photovoltaic power generation energy supply, the energy consumption cost is reduced, and the environmental protection is improved.
Next, the process of sewage treatment by using the integrated device of the solar photovoltaic power generation combined membrane bioreactor of the embodiment is as follows:
step one, inputting sewage to be treated into an anoxic tank through a liquid inlet pipe, and simultaneously starting an aeration device positioned at the bottom of the anoxic tank to input oxygen into the anoxic tank. In the process, according to the condition of the sewage to be treated, such as the sewage quantity and the sewage cleaning degree, the growth period of the microorganisms is controlled by adjusting the aeration quantity and the aeration time, so that the microorganisms in the anoxic tank can quickly and effectively complete the treatment of the sewage. Meanwhile, according to the temperature of the sewage to be treated, the heating plate assembly can be selectively opened to release heat, so that the activity of microorganisms is maintained and increased, and the treatment effect of the microorganisms is improved.
And step two, the treatment liquid in the anoxic tank is drained to the aerobic tank through a connecting pipe, and the treatment liquid forms water circulation at the baffle plate. By means of the water circulation formed by the method, on one hand, preheated sewage and sludge can be fully mixed and contacted, and on the other hand, the surface of the membrane is washed to avoid the deposition of a filter cake layer. Meanwhile, according to the growth condition of microorganisms in the aerobic tank, the aeration device in the left zone can be adjusted to control the dissolved oxygen content, so that the effective treatment of the microorganisms on the sewage is ensured.
And step three, draining water formed after the membrane component is subjected to high-efficiency separation treatment to a water production tank through a water outlet pipe, draining microorganisms and untreated pollutants in the mixed liquid after the microorganisms and the untreated pollutants are efficiently separated and intercepted by the membrane component to an anaerobic tank through a return pipe, and treating again.
And step four, performing backwashing operation on the membrane module after long-time continuous sewage treatment. At the moment, the aeration device positioned at the bottom of the membrane component is started, the surface of the membrane component is directly washed by large aeration quantity, so that the biological membrane attached to the surface of the membrane falls off, the growth of a new biological membrane is promoted, the metabolism of organisms is formed, and meanwhile, the fallen biological membrane can flow back to the anoxic tank again through the return pipe, so that the biomass in the anoxic tank is improved.
In the sewage treatment process, the position of the baffle and the aeration quantity of the aeration device below the membrane component are adjusted in real time according to the sewage treatment quantity and the deposition condition of the filter cake layer on the surface of the membrane. When the conventional sewage amount is treated, the height of the baffle is increased, the lower channel is opened, the water circulation directly formed by the water flow flowing out of the connecting pipe at the position of the baffle slightly erodes the surface of the membrane, and simultaneously, the mixed contact of the sewage and the sludge in the aerobic tank is driven, so that the treatment of the sewage by microorganisms is kept. When the sewage amount that needs to handle is lower, when the rivers that the connecting pipe flows out can't form effective hydrologic cycle in the baffle position, reduce the baffle height, open aeration equipment's in the left district little aeration rate simultaneously, the rivers that supplementary connecting pipe output maintain rivers circulation, keep the microbial activity. When the amount of sewage to be treated is large, the small aeration amount of the aeration device below the membrane component is opened, so that water flow and aeration generate interaction on the surface of the membrane to form cross flow velocity, the scouring effect on the surface of the membrane is improved, and the high-efficiency interception and filtration effect of the membrane component is maintained. When the stage sewage treatment is finished and the back washing is needed, the large aeration quantity of the aeration device below the membrane component is started and the back washing operation is carried out by matching with the water collected in the water production tank.
Next, the integrated device of the solar photovoltaic power generation combined membrane bioreactor of the embodiment is used for treating domestic sewage of a certain cell in Gansu region to verify the water treatment effect.
Wherein the anoxic tank is designed into a square tank of 0.6m multiplied by 0.3m multiplied by 0.5m, the aerobic tank is designed into a square tank of 1.0m multiplied by 0.3m multiplied by 0.5m, the baffle plate divides the aerobic tank into a right zone with the length of 0.6m and a left zone with the length of 0.4m, and the amount of sewage to be treated is 5.6m3D, the retention time of the sewage in the anoxic tank is 2 hours, the retention time in the aerobic tank is 8 hours, the distance from the water inlet pipe to the bottom of the anoxic tank is 0.1m, the distance from the heating plates to the bottom of the anoxic tank is 0.08m, the distance between every two adjacent heating plates is 0.08m, the initial distance from the bottom of the baffle to the bottom of the aerobic tank is 0.1m, and the initial distance from the top of the baffle to the edge of the aerobic tank is 0.15 m.
In the sewage treatment process, the power provided by the solar photovoltaic power generation unit is controlled to be about 20kw, so that the sewage is in a medium-temperature and high-temperature reaction state in the anoxic tank, and the small aeration amount of the aeration device below the membrane module is started, so that the cross flow velocity on the surface of the membrane module is formed by interaction with water circulation. After the sewage treatment operation for a certain time, the water quality at different stages is monitored, and the following data is obtained. Wherein, table 1 is the comparison data of the water quality of the anoxic tank under the heating and non-heating states, and table 2 is the comparison data of the water quality of the effluent of the anoxic tank and the water quality of the effluent of the water outlet pipe under the heating state.
TABLE 1
| Detecting items | Raw water | Non-heating state | Heating state |
| COD(mg/L) | 380 | 183 | 146 |
| BOD(mg/L) | 175 | 84 | 47 |
| Total nitrogen (mg/L) | 68.2 | 56.4 | 43.2 |
TABLE 2
| Detecting items | Raw water | Yielding water of anoxic pond | Water outlet of water outlet pipe |
| COD(mg/L) | 380 | 146 | 29.3 |
| BOD(mg/L) | 175 | 47 | 8.5 |
| Total nitrogen (mg/L) | 68.2 | 43.2 | 12.3 |
As can be seen from the data in table 1, the raw water quality parameters are COD: 380mg/L, BOD: 175mg/L, total nitrogen: under the condition of 68.2mg/L, the effect of treating the water quality by the microorganisms in the anoxic pond can be obviously improved by controlling the temperature of the anoxic pond, and compared with the water quality treatment at the natural temperature, the COD removal rate is improved by 9.8 percent, the BOD removal rate is improved by 21 percent, and the total nitrogen removal rate is improved by 19.4 percent. Therefore, compared with the sewage treatment in the normal temperature state, the sewage treatment effect of the microorganisms in the anoxic tank on the sewage can be greatly improved by keeping the sewage in the anoxic tank in the medium-temperature and high-temperature reaction state.
As can be seen from the data in Table 2, by arranging the baffle plate in the aerobic tank, water circulation is formed by the water flow output by the connecting pipe, so that the microorganisms in the whole aerobic zone and the sewage form a flowing mixing effect, simultaneously, the small aeration quantity opened below the membrane component is matched to ensure that the water circulation and the small aeration quantity interact with each other on the surface of the membrane to form cross flow velocity to form effective continuous scouring on the surface of the membrane component, thereby ensuring the high-efficiency interception effect of the membrane component under the condition of improving the sewage treatment effect of microorganisms, thus not only further greatly improving the sewage treatment effect, leading the removal rate of COD to reach 92.3 percent, the removal rate of BOD to reach 95.1 percent and the removal rate of total nitrogen to reach 82.0 percent, leading the final effluent to meet the national first-grade A discharge standard, meanwhile, the membrane pollution is effectively slowed down, and the effects of reducing the replacement frequency of the membrane component and reducing the operation cost are achieved.
Claims (10)
1. A solar photovoltaic power generation combined membrane bioreactor integrated device is characterized by comprising an anoxic tank, an aerobic tank, a membrane component, a heating plate component and a solar photovoltaic power generation unit; wherein the anoxic tank is provided with a liquid inlet pipe for introducing sewage to be treated; the aerobic tank is positioned at the downstream of the anoxic tank and communicated with the anoxic tank through a connecting pipe, and liquid in the anoxic tank is drained into the aerobic tank; the heating plate assembly is positioned in the anoxic pond, and the solar photovoltaic power generation unit is connected with the heating plate assembly to provide electric energy to drive the heating plate assembly to release heat; the membrane module is positioned in the aerobic tank, and the aerobic tank is provided with a water outlet pipe for leading out the water treated by the membrane module.
2. The integrated device of a solar photovoltaic combined membrane bioreactor as claimed in claim 1, wherein the heating plate assembly comprises a plurality of heating plates, wherein the plurality of heating plates are sequentially fixed on the mounting column in parallel at intervals, and each heating plate is provided with a plurality of round holes.
3. The integrated solar photovoltaic power generation combined membrane bioreactor device according to claim 1, further comprising a baffle plate; the baffle is inserted into the aerobic tank along the vertical direction, and the aerobic tank is divided into a left area and a right area; an upper channel is arranged above the baffle, lower channels are arranged below the baffle, and the upper channel and the lower channels communicate the left area with the right area; the outlet of the connecting pipe is positioned in the left area and points to the lower channel along the horizontal direction, and the membrane assembly is positioned in the right area.
4. The integrated device of a solar photovoltaic power generation combined membrane bioreactor as claimed in claim 3, wherein the baffle plate is movably connected with the aerobic tank and can reciprocate along the vertical direction to adjust the flow area of the lower channel.
5. The integrated solar photovoltaic power generation combined membrane bioreactor device according to claim 3, further comprising a return pipe; the inlet of the return pipe is positioned in the right area, and the outlet of the return pipe is positioned in the anoxic area.
6. The integrated solar photovoltaic power generation combined membrane bioreactor device according to any one of claims 1 to 5, further comprising an aeration device; the aeration device is positioned below the membrane component.
7. The integrated solar photovoltaic power generation combined membrane bioreactor device as claimed in claim 6, wherein an aeration device is arranged in each of the anoxic tank and the aerobic tank.
8. The integrated solar photovoltaic power generation and membrane bioreactor device as claimed in claim 6, wherein the solar photovoltaic power generation unit is connected with an aeration pump in the aeration device to provide electric energy to drive the aeration pump to operate.
9. The integrated solar photovoltaic power generation combined membrane bioreactor device as claimed in any one of claims 1 to 5, wherein the outlet of the liquid inlet pipe is arranged along the horizontal direction and is spaced from the bottom of the anoxic pond.
10. The integrated solar photovoltaic power generation combined membrane bioreactor device according to any one of claims 1 to 5, further comprising a chemical dosing unit; the medicament feeding unit is communicated with the anoxic tank and used for feeding medicaments into the anoxic tank.
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