CN110803768A - Sewage treatment device and treatment process thereof - Google Patents
Sewage treatment device and treatment process thereof Download PDFInfo
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- CN110803768A CN110803768A CN201911210411.2A CN201911210411A CN110803768A CN 110803768 A CN110803768 A CN 110803768A CN 201911210411 A CN201911210411 A CN 201911210411A CN 110803768 A CN110803768 A CN 110803768A
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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
- C02F3/302—Nitrification and denitrification treatment
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Abstract
The application discloses sewage treatment plant, including first pipeline, second pipeline, a plurality of oxygen deficiency pond, a plurality of good oxygen pond and MBR membrane cisterna, per two respectively set up one between the oxygen deficiency pond good oxygen pond, sewage passes through after the preliminary treatment first pipeline flows in each in proper order the oxygen deficiency pond, every the oxygen deficiency pond passes through the second pipe connection rather than adjacent closely good oxygen pond, the MBR membrane cisterna rather than adjacent closely good oxygen pond passes through the second pipe connection. The sewage treatment device has the advantages of simple structure, good purification effect, high water purification efficiency, low operating cost and the like. In addition, the application also discloses a treatment process adopting the sewage treatment device, and the treatment process is simple to operate, high in water purification efficiency, high in effluent quality, low in operation cost and the like.
Description
Technical Field
The application belongs to the field of sewage treatment, and particularly relates to a sewage treatment device and a treatment process thereof.
Background
Along with the shortage of water resources, serious water pollution and annual increase of sewage discharge in China, the supply level mu of the water resources is seriously in contradiction between supply and demand. According to the statistics of world banks, the occupation amount of the water resources of Chinese per capita is only 1/3 which is the average level of the whole world, and the current situation of water resource shortage in China is reflected. Moreover, the problem of water pollution in China is prominent, and the water quality of surface water of the four-step system is seriously polluted.
From the requirement of improving the water environment quality, in many cities, the effluent treated by the sewage treatment plant often becomes the main water body of an inland river of the city, so the effluent of the sewage treatment plant is required to reach the four types of ground surface level, which puts higher requirements on the treatment process.
For upgrading and reconstruction of some traditional sewage treatment plants, when total nitrogen or ammonia nitrogen is treated as a target, the method mainly aims at strengthening biochemical treatment or increasing biochemical treatment by advanced treatment, and a denitrification filter or an aeration biological filter is directly added after secondary treatment (as shown in figure 1); when the total phosphorus and suspended matters are mainly removed, a precipitation and filtration treatment mode is mostly adopted. However, the traditional process has a long flow and complex management, and the MBR (Membrane bioreactor) is combined with efficient biochemical treatment (as shown in fig. 2), so that the effluent solid-liquid separation efficiency is high, suspended matters are close to zero, viruses and bacteria can be effectively removed, the development is rapid in recent years, but the market generally reflects the problems of high running energy consumption of the MBR and the like.
In addition, carbon sources in municipal sewage in China are generally insufficient, and carbon sources are required to be added into the sewage to achieve the denitrification effect, so that the operation cost is greatly increased.
Disclosure of Invention
The application aims to provide a sewage treatment device to solve the problems of long operation process, high operation cost, complex management and the like in the background technology.
In order to achieve the above object, on one hand, the embodiments of the present application provide the following technical solutions: the utility model provides a sewage treatment device, includes first pipeline, second pipeline, a plurality of oxygen deficiency pond, a plurality of good oxygen pond and MBR membrane cisterna, every two respectively set up one between the oxygen deficiency pond good oxygen pond, sewage passes through after the preliminary treatment first pipeline flows into each in proper order the oxygen deficiency pond, every the oxygen deficiency pond passes through the second pipe connection rather than adjacent good oxygen pond, MBR membrane cisterna rather than adjacent good oxygen pond passes through the second pipe connection.
In some embodiments, the sewage treatment apparatus controls the amount of sewage flowing into each of the anoxic tanks according to the temperature of the sewage.
In some embodiments, the MBR membrane tank is further connected to the initial anoxic tank through a third pipe to return the mixed liquor to the initial anoxic tank, and the amount of the mixed liquor returned to the initial anoxic tank is controlled according to the temperature of the mixed liquor.
In some embodiments, the plurality of anoxic tanks includes a first anoxic tank, a second anoxic tank, a third anoxic tank, a fourth anoxic tank, and a fifth anoxic tank; the plurality of aerobic tanks comprise a first aerobic tank, a second aerobic tank, a third aerobic tank, a fourth aerobic tank and a fifth aerobic tank; sewage flows into the first anoxic tank, the second anoxic tank, the third anoxic tank, the fourth anoxic tank and the fifth anoxic tank in sequence through the first pipeline after being pretreated; the first anoxic tank, the first aerobic tank, the second anoxic tank, the second aerobic tank, the third anoxic tank, the third aerobic tank, the fourth anoxic tank, the fourth aerobic tank, the fifth anoxic tank and the fifth aerobic tank are sequentially connected through the second pipeline; and the fifth aerobic tank is connected with the MBR membrane tank through the second pipeline, and the MBR membrane tank returns the mixed liquid to the first anoxic tank through the third pipeline.
In some embodiments, when the temperature of the sewage is higher than 12 ℃, the sewage sequentially enters the first anoxic tank, the second anoxic tank, the third anoxic tank, the fourth anoxic tank and the fifth anoxic tank through the first pipeline, the ratio of the sewage amount is 1: 1, and the mixed liquid flows back to the first anoxic tank by 0.5-1.0 time of the inflow of the untreated sewage.
In some embodiments, when the temperature of the sewage is less than or equal to 12 ℃, the sewage sequentially enters the first anoxic tank, the second anoxic tank, the third anoxic tank, the fourth anoxic tank and the fifth anoxic tank through the first pipeline, the ratio of the sewage amount is 5: 4: 3: 2: 1, and the mixed liquid flows back to the first anoxic tank by 1.0-1.5 times of the inflow amount of the untreated sewage.
In some embodiments, a hollow fiber membrane module is arranged in the MBR membrane tank, membrane filaments of the hollow fiber membrane module are made of PVDF (polyvinylidene fluoride), the pore diameter is 0.01-0.04 mu m, and the flux is 20-42L/(m)2H), the sludge concentration is 2.5g/L-4 g/L.
On the other hand, the application also provides a sewage treatment process, which comprises the following steps: pretreating the sewage by conventional technology, such as by a grid, a grit chamber, a membrane grid and the like; and introducing the pretreated sewage into any one of the sewage treatment devices for treatment to obtain purified water.
In some embodiments, the aeration (gas-water ratio) of the MBR membrane tank is less than 3: 1.
In some embodiments, the dissolved oxygen in each anoxic tank is controlled to be between 0.3mg/L and 0.5mg/L, and the dissolved oxygen in each aerobic tank is controlled to be between 0.5mg/L and 1.0 mg/L.
Compared with the prior art, the method has the following beneficial effects: the sewage treatment device and the process thereof optimize and combine the secondary treatment and the advanced treatment in the sewage regeneration treatment process, change the traditional water inlet and backflow mode, increase the flexibility of process operation, and enable the sewage treatment device and the treatment process thereof to have the advantages of simple operation, high nitrogen and phosphorus removal efficiency, stable operation, good operation flexibility, low operation cost, good purification effect and high effluent quality.
Drawings
FIG. 1 is a schematic process flow diagram 1 of upgrading and modifying a conventional sewage treatment plant;
FIG. 2 is a schematic process flow diagram 2 of upgrading and modifying a conventional sewage treatment plant;
FIG. 3 is a schematic view of a sewage treatment apparatus according to an embodiment of the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Reference throughout this specification to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the present invention. Thus, appearances of the phrases "in one embodiment" or "in various embodiments" in various places throughout this specification are not necessarily all referring to the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.
The embodiment of the application provides a sewage treatment process, which comprises the following steps: pretreating the sewage by conventional technology, such as by a grid, a grit chamber, a membrane grid and the like; the pretreated sewage is introduced into a sewage treatment device described below for treatment to obtain purified water.
In some embodiments, as shown in fig. 3, an embodiment of the present application further provides a sewage treatment apparatus, which includes a first pipeline, a second pipeline, a plurality of anoxic tanks, a plurality of aerobic tanks, and an MBR membrane tank, where one aerobic tank is disposed between every two anoxic tanks, sewage flows into each anoxic tank through the first pipeline after being pretreated, each anoxic tank is connected to the adjacent aerobic tank through the second pipeline, and the MBR membrane tank and the adjacent aerobic tank are connected through the second pipeline.
The sewage treatment device and the process thereof provided by the embodiment of the application optimize the traditional treatment process, and increase the flexibility of process operation by changing the traditional water inlet and backflow modes, so that the sewage treatment device and the treatment process thereof are simple to operate, high in nitrogen and phosphorus removal efficiency, stable in operation, good in operation flexibility, low in operation cost, good in purification effect and high in effluent quality, and meanwhile, the sewage treatment device is simple in structure and easy to operate.
In some embodiments, the sewage treatment apparatus controls the amount of sewage flowing into each of the anoxic tanks according to the temperature of the sewage. In the embodiment of the present application, the temperature is 12 ℃, but the present application is not limited thereto, and the critical temperature can be adjusted according to the specific application.
In some embodiments, the MBR membrane tank may further be connected to the initial anoxic tank through a third pipe to return the mixed liquor to the initial anoxic tank, and the amount of the mixed liquor returned to the initial anoxic tank is controlled according to the temperature of the mixed liquor. By adopting the arrangement, the purification efficiency of sewage and the quality of effluent water can be further improved.
In the embodiments of the present application, 5 anoxic tanks and 5 aerobic tanks are taken as examples, but the present application is not limited thereto, and the number of the anoxic tanks and the aerobic tanks may be increased or decreased according to the application requirements. Specifically, the plurality of anoxic tanks include a first anoxic tank, a second anoxic tank, a third anoxic tank, a fourth anoxic tank, and a fifth anoxic tank. The plurality of aerobic tanks comprise a first aerobic tank, a second aerobic tank, a third aerobic tank, a fourth aerobic tank and a fifth aerobic tank. Sewage flows into the first anoxic tank, the second anoxic tank, the third anoxic tank, the fourth anoxic tank and the fifth anoxic tank in sequence through the first pipeline after being pretreated. The first anoxic tank, the first aerobic tank, the second anoxic tank, the second aerobic tank, the third anoxic tank, the third aerobic tank, the fourth anoxic tank, the fourth aerobic tank, the fifth anoxic tank and the fifth aerobic tank are sequentially connected through the second pipeline. In some embodiments, the fifth aerobic tank may be further connected to the MBR membrane tank through the second pipe, and the MBR membrane tank returns the mixed liquor to the first anoxic tank through the third pipe.
In some embodiments, when the temperature of the sewage is higher than 12 ℃, the sewage amount of the pretreated sewage sequentially enters the first anoxic tank, the second anoxic tank, the third anoxic tank, the fourth anoxic tank and the fifth anoxic tank through the first pipeline, and the ratio of the sewage amount is controlled to be 1: 1. And assuming that the water inflow of the sewage is 15 tons/hour, the first anoxic tank to the fifth anoxic tank respectively feed water for 3 tons/hour, the sewage entering the first anoxic tank is discharged and sequentially enters the first aerobic tank to the fifth aerobic tank, the sewage entering the first aerobic tank is discharged and sequentially enters the second anoxic tank to the fifth aerobic tank, and the rest are repeated in the same way, namely, the sewage sequentially flows from the first anoxic tank to the fifth aerobic tank without flowing back, and the discharged water of the fifth aerobic tank is sequentially fed into an MBR membrane tank to separate activated sludge from water, so that the discharged water can be discharged or recycled after reaching the standard. In addition, in other embodiments, the mixed liquor in the MBR membrane tank (i.e. the water treated by the first anoxic tank to the fifth aerobic tank) flows back to the first anoxic tank by 0.5-1.0 time of the inflow of untreated sewage (i.e. the flow of the water quantity of the corresponding treatment scale), which is far lower than the 4 times of the backflow required by the traditional MBR.
In other embodiments, when the temperature of the sewage is less than or equal to 12 ℃, the sewage flows into the first anoxic tank, the second anoxic tank, the third anoxic tank, the fourth anoxic tank and the fifth anoxic tank through the first pipeline in sequence, and the ratio of the sewage flow to the sewage flow is 5: 4: 3: 2: 1. Assuming that the water inflow of the sewage is 15 tons/hour, the first to fifth anoxic tanks respectively inflow water for 5 tons/hour, 4 tons/hour, 3 tons/hour, 2 tons/hour and 1 ton/hour, and the specific flow direction of the sewage is the same as that when the temperature of the sewage is more than 12 ℃. In addition, in other embodiments, the mixed liquor in the MBR membrane tank (i.e. the water treated by the first anoxic tank to the fifth aerobic tank) flows back to the first anoxic tank by 1.0-1.5 times of the inflow of untreated sewage (i.e. the flow of the water quantity of the corresponding treatment scale), which is far lower than the 4 times of the backflow required by the traditional MBR.
In some embodiments, a hollow fiber membrane module is arranged in the MBR membrane tank, membrane filaments of the hollow fiber membrane module are made of PVDF (polyvinylidene fluoride), the pore diameter is 0.01-0.04 mu m, and the flux is 20-42L/(m)2H), the sludge concentration is 2.5g/L-4 g/L.
In some embodiments, the aeration rate of the MBR membrane tank is less than 3: 1, which is much less than 10-15: 1 of the aeration rate (gas-water ratio) required by conventional MBRs.
In some embodiments, the dissolved oxygen in each of the anoxic tanks (e.g., the first anoxic tank to the fifth anoxic tank) is controlled to be between 0.3mg/L and 0.5mg/L, and the dissolved oxygen in each of the aerobic tanks (e.g., the first aerobic tank to the fifth aerobic tank) is controlled to be between 0.5mg/L and 1.0 mg/L.
In the above embodiment, the short-cut nitrification and denitrification can be realized by equally distributing the water amount of each anoxic tank and each aerobic tank, replacing the single-stage continuous anoxic and aerobic operation with 5-stage short-time anoxic and aerobic repeated operation, and gradually aerating the aerobic tank to make the nitrifying bacteria in the 'hunger-full' alternating state. The multistage anoxic-aerobic process fully utilizes organic carbon in raw water to carry out denitrification, improves the total nitrogen removal rate and the phosphorus removal efficiency in sewage, can improve the purification efficiency of the sewage and the quality of effluent water, does not need to return sludge of an aerobic section to an anoxic section, can simplify the operation, reduce the operating cost and the like. In addition, this application embodiment through the backward flow that reduces good oxygen pond to the oxygen deficiency pond, reduce the aeration rate of MBR membrane cisterna and from the reflux ratio of MBR membrane cisterna to first oxygen deficiency pond, can the significantly reduced backwash pump and the energy consumption of aeration fan, can further reduce the working costs.
Although embodiments of the present application have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the application, the scope of which is defined in the appended claims and their equivalents.
Claims (10)
1. The utility model provides a sewage treatment device, its characterized in that includes first pipeline, second pipeline, a plurality of oxygen deficiency pond, a plurality of good oxygen pond and MBR membrane cisterna, every two respectively set up one between the oxygen deficiency pond good oxygen pond, sewage passes through after the preliminary treatment first pipeline flows in each in proper order the oxygen deficiency pond, every the oxygen deficiency pond passes through the second pipe connection rather than adjacent near good oxygen pond, MBR membrane cisterna and rather than adjacent near good oxygen pond pass through the second pipe connection.
2. The sewage treatment apparatus of claim 1, wherein an amount of sewage flowing into each of the anoxic tanks is controlled according to a temperature of the sewage.
3. The sewage treatment apparatus of claim 1 or 2, wherein the MBR membrane tank is further connected to the initial anoxic tank through a third pipe to return the mixed liquor to the initial anoxic tank, and the amount of the mixed liquor returned to the initial anoxic tank is controlled according to the temperature of the mixed liquor.
4. The wastewater treatment plant of claim 3, wherein the plurality of anoxic tanks comprises a first anoxic tank, a second anoxic tank, a third anoxic tank, a fourth anoxic tank, and a fifth anoxic tank;
the plurality of aerobic tanks comprise a first aerobic tank, a second aerobic tank, a third aerobic tank, a fourth aerobic tank and a fifth aerobic tank;
sewage flows into the first anoxic tank, the second anoxic tank, the third anoxic tank, the fourth anoxic tank and the fifth anoxic tank in sequence through the first pipeline after being pretreated;
the first anoxic tank, the first aerobic tank, the second anoxic tank, the second aerobic tank, the third anoxic tank, the third aerobic tank, the fourth anoxic tank, the fourth aerobic tank, the fifth anoxic tank and the fifth aerobic tank are sequentially connected through the second pipeline; and
the fifth aerobic tank is connected with the MBR membrane tank through the second pipeline, and the MBR membrane tank returns the mixed liquid to the first anoxic tank through the third pipeline.
5. The sewage treatment apparatus according to claim 4, wherein when the temperature of the sewage is higher than 12 ℃, the sewage sequentially enters the first anoxic tank, the second anoxic tank, the third anoxic tank, the fourth anoxic tank and the fifth anoxic tank through the first pipeline at a sewage amount ratio of 1: 1, and the mixed liquid flows back to the first anoxic tank at a water inflow of untreated sewage of 0.5-1.0 times.
6. The sewage treatment apparatus according to claim 4, wherein when the temperature of the sewage is 12 ℃ or lower, the sewage sequentially enters the first anoxic tank, the second anoxic tank, the third anoxic tank, the fourth anoxic tank and the fifth anoxic tank through the first pipeline at a sewage amount ratio of 5: 4: 3: 2: 1, and the mixed liquid flows back to the first anoxic tank at a water inflow of untreated sewage of 1.0-1.5 times.
7. The sewage treatment device according to claim 1, wherein a hollow fiber membrane module is arranged in the MBR membrane tank, membrane filaments of the hollow fiber membrane module are made of PVDF, the pore diameter is 0.01-0.04 μm, and the flux is 20-42L/(m)2H), the sludge concentration is 2.S-4 g/L.
8. A sewage treatment process is characterized by comprising the following steps:
pretreating the sewage;
passing the pretreated sewage into a sewage treatment plant according to any one of claims 1 to 8 for treatment to obtain purified water.
9. The process of claim 8, wherein the MBR membrane tank has a gas-water ratio of less than 3: 1.
10. The process as claimed in claim 8, wherein the dissolved oxygen in each anoxic tank is controlled to be between 0.3 and 0.5mg/L, and the dissolved oxygen in each aerobic tank is controlled to be between 0.5 and 1.0 mg/L.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201911210411.2A CN110803768A (en) | 2019-11-29 | 2019-11-29 | Sewage treatment device and treatment process thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911210411.2A CN110803768A (en) | 2019-11-29 | 2019-11-29 | Sewage treatment device and treatment process thereof |
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Application publication date: 20200218 |