CN113800639B - Intensive biochemical pool with activated sludge circulation capacity - Google Patents

Intensive biochemical pool with activated sludge circulation capacity Download PDF

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CN113800639B
CN113800639B CN202111372697.1A CN202111372697A CN113800639B CN 113800639 B CN113800639 B CN 113800639B CN 202111372697 A CN202111372697 A CN 202111372697A CN 113800639 B CN113800639 B CN 113800639B
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sludge
tank
activated sludge
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water
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CN113800639A (en
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尹美桥
许效天
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Panoramic View Beijing Technology Co ltd
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Panoramic View Beijing Technology Co ltd
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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
    • C02F11/00—Treatment of sludge; Devices therefor
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F11/00—Treatment of sludge; Devices therefor
    • C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F11/00—Treatment of sludge; Devices therefor
    • C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
    • C02F11/121—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering
    • C02F11/122—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering using filter presses
    • 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
    • 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
    • C02F3/28—Anaerobic digestion processes
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F9/00—Multistage treatment of water, waste water or sewage
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/30—Treatment of water, waste water, or sewage by irradiation
    • C02F1/32—Treatment of water, waste water, or sewage by irradiation with ultraviolet light
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
    • C02F1/444—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by ultrafiltration or microfiltration
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2203/00—Apparatus and plants for the biological treatment of water, waste water or sewage
    • C02F2203/006—Apparatus and plants for the biological treatment of water, waste water or sewage details of construction, e.g. specially adapted seals, modules, connections
    • 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)
  • Engineering & Computer Science (AREA)
  • Hydrology & Water Resources (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Microbiology (AREA)
  • Biodiversity & Conservation Biology (AREA)
  • Mechanical Engineering (AREA)
  • Purification Treatments By Anaerobic Or Anaerobic And Aerobic Bacteria Or Animals (AREA)
  • Activated Sludge Processes (AREA)

Abstract

The application discloses intensive biochemical pond that possesses activated sludge circulation ability includes: the system comprises a primary strengthening treatment module, a secondary treatment module and a sludge regeneration module; the primary strengthening treatment module comprises a hydrolysis acidification pool; the secondary treatment module comprises an anaerobic tank, an anoxic tank, an aerobic tank, a biological filter and a sedimentation tank; the sludge regeneration module comprises a sludge backflow tank, a sludge stabilizing tank, a sludge concentration tank and a sludge selection tank. The intensive biochemical pond that possesses activated sludge circulation ability keeps activated sludge's high activity and durability through sludge regeneration system, realizes the high-efficient of aquatic pollutant and gets rid of, can handle multiple sewage such as municipal sewage, villages and small towns sewage, industrial waste water and mixed waste water, has reduced the emission of excess sludge simultaneously, has practiced thrift area, has still realized high automation and obvious energy saving and consumption reduction through automatic management control system.

Description

Intensive biochemical pool with activated sludge circulation capacity
Technical Field
The application relates to the field of water treatment, in particular to an intensive biochemical pool with activated sludge circulation capacity.
Background
With the continuous improvement of living standards of people, the higher requirements on the quality of living environment and the gradual reduction of the bearing capacity of water ecological environment pollution, the requirements on the discharge standards of municipal sewage, village and town sewage, industrial wastewater or mixed sewage are more and more strict, namely, the more serious challenge is provided for the existing sewage treatment process, so that the research and development of novel efficient sewage treatment comprehensive processes are urgent.
At present, the typical comprehensive process for treating municipal sewage, village and town sewage, industrial wastewater or mixed sewage is a pretreatment system, a biochemical process and a deep treatment system, wherein the biochemical process is the core of a water treatment process, and the most representative biochemical processes comprise SBR, AAO, UASB + oxidation pond, hydrolytic acidification + UBF + CASS, AA + MBR and the like, but the technologies have the defects of low impact load resistance capability, only single-property sewage treatment, low sludge concentration, insignificant removal effect, large building occupied area, inconvenient operation and management, easy membrane pollution and the like, so that the application rate of the technologies in actual production is reduced.
Disclosure of Invention
Object of the application
In view of the above problems, the present application discloses the following technical solutions in order to save floor space, improve pollutant removal effect, reduce excess sludge discharge, and achieve energy saving and consumption reduction.
(II) technical scheme
The application discloses intensive biochemical pond that possesses activated sludge circulation ability includes: the system comprises a primary strengthening treatment module, a secondary treatment module and a sludge regeneration module;
the primary strengthening treatment module comprises a hydrolysis acidification pool;
the secondary treatment module comprises an anaerobic tank, an anoxic tank, an aerobic tank, a biological filter and a sedimentation tank;
the sludge regeneration module comprises a sludge backflow tank, a sludge stabilizing tank, a sludge concentration tank and a sludge selection tank.
In one possible embodiment, the intensive biochemical tank is provided with an outer circle and an inner circle, and the first treatment region and the second treatment region are formed by the outer circle and the inner circle.
In a possible embodiment, the aerobic tank, the biological filter tank, the sedimentation tank and the sludge regeneration module are arranged in the first treatment zone, and the hydrolysis acidification tank, the anaerobic tank and the anoxic tank are arranged in the second treatment zone.
In a possible implementation mode, the sludge stabilizing tank, the sludge return tank, the sludge concentration tank and the sludge selection tank of the sludge regeneration module are connected in sequence.
In a possible embodiment, the sludge return tank is arranged inside the sludge stabilizing tank, and the sludge stabilizing tank, the sludge concentrating tank and the sludge selecting tank are connected in sequence.
As a second aspect of the application, the application also discloses a water treatment system, which comprises the intensive biochemical pond with the activated sludge circulation capacity, a pretreatment subsystem, a deep treatment subsystem and a residual sludge treatment subsystem.
In one possible embodiment, the water treatment system operates based on a SCADA automated control system.
As a third aspect of the present application, the present application also discloses a water treatment process of an intensive biochemical tank with activated sludge circulation capability, comprising:
the primary purified water treated by the pretreatment subsystem enters a sludge concentration tank, is mixed with activated sludge in the sludge concentration tank, and is subjected to tertiary biological selection through a sludge selection tank to obtain secondary purified water;
hydrolyzing and acidifying the secondary purified water in a hydrolysis acidification tank to obtain tertiary purified water;
the three-stage purified water sequentially passes through the anaerobic tank, the aerobic tank, the biological filter and the sedimentation tank to obtain biochemical purified water.
In one possible embodiment, the activated sludge concentration is greater than or equal to 40000 mg/L.
In one possible embodiment, the circulation path of the activated sludge in the sludge regeneration module is:
refluxing sludge in the sedimentation tank to a sludge refluxing tank;
a part of sludge in the sludge backflow tank flows back to the sludge stabilizing tank, and returns to the aerobic tank after being stabilized; the other part of the sludge enters a sludge concentration tank and a sludge selection tank in turn.
In one possible embodiment, the activated sludge is acclimated and cultured using special active bacteria at the beginning of commissioning the water treatment system.
In a possible embodiment, the nitrified liquid in the aerobic tank enters the anoxic tank through a reflux system to remove nitrogen.
(III) advantageous effects
The intensive biochemical pond that possesses activated sludge circulation ability keeps activated sludge's high activity and durability through sludge regeneration system, realizes the high-efficient of aquatic pollutant and gets rid of, can handle multiple sewage such as municipal sewage, villages and small towns sewage, industrial waste water and mixed waste water, has reduced the emission of excess sludge simultaneously, has practiced thrift area, has still realized high automation and obvious energy saving and consumption reduction through automatic management control system.
Drawings
The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining and illustrating the present application and should not be construed as limiting the scope of the present application.
Fig. 1 is a block diagram of an intensive biochemical tank with activated sludge circulation capability disclosed in the present application.
Fig. 2 is a block diagram of the water treatment system disclosed in the present application.
FIG. 3 is a flow chart of a water treatment method disclosed herein.
Reference numerals: 100. an intensive biochemical pool; 200. a pre-processing subsystem; 300. a deep processing subsystem; 400. a residual sludge treatment subsystem; 111. a hydrolysis acidification pool; 121. an anaerobic tank; 122. an anoxic tank; 123. an aerobic tank; 124. a biological filter; 125. a sedimentation tank; 131. a sludge return tank; 132. a sludge stabilizing tank; 133. a sludge concentration tank; 134. a sludge selection tank; 210. coarse grating; 220. fine grids; 230. a grit chamber; 240. a water collecting tank; 310. a sand filtration tank; 320. a micro-filter; 330. an ultraviolet disinfection tank; 410. an external sludge thickener; 420. a screw stacking machine; 430. and (4) a plate-and-frame filter press.
Detailed Description
In order to make the implementation objects, technical solutions and advantages of the present application clearer, the technical solutions in the embodiments of the present application will be described in more detail below with reference to the drawings in the embodiments of the present application.
An intensive biochemical pond with activated sludge circulation capability and a water treatment system based on the intensive biochemical pond disclosed by the present application are described in detail below with reference to fig. 1 and 2, and the intensive biochemical pond 100 disclosed by the present embodiment includes a primary intensified treatment module, a secondary treatment module and a sludge regeneration module;
the first-stage strengthening treatment module comprises a hydrolysis acidification tank 111, and the second-stage treatment module comprises an anaerobic tank 121, an anoxic tank 122, an aerobic tank 123, a biological filter 124 and a sedimentation tank 125. The sludge regeneration module comprises a sludge return tank 131, a sludge stabilizing tank 132, a sludge concentration tank 133 and a sludge selection tank 134.
In at least one embodiment, the integrated biochemical pond 100 is arranged as shown in fig. 1, the combined biochemical pond is circular in appearance, has a depth of 8-13 m, preferably 10 m, and comprises 1 hydrolysis acidification pond 111, 2 anaerobic ponds 121, 2 anoxic ponds 122, 2 aerobic ponds 123, 1 sludge return pond 131, 1 sludge stabilization pond 132, 1 sludge concentration pond 133, 3 sludge selection ponds 134, 4 biological filters 124 and 4 sedimentation ponds 125.
Further, the intensive biochemical tank 100 is divided into a first treatment area and a second treatment area by a circular ring formed by an inner circle and an outer circle, the first treatment area is an inner circle area, the second treatment area is an annular area formed by an inner circle and an outer circle, wherein the aerobic tank 123, the sludge return tank 131, the sludge stabilizing tank 132, the sludge concentrating tank 133, the sludge selecting tank 134, the biological filter 124 and the sedimentation tank 125 are arranged in the first treatment area, the sludge return tank 131 in the sludge regeneration module is arranged in the sludge stabilizing tank 132, the bottom of the sludge return tank 131 is higher than the bottom of the sludge stabilizing tank 132, namely the sludge stabilizing tank 132 is communicated, the sludge return tank 131 is communicated with the sludge stabilizing tank 132 through holes, further, the sludge stabilizing tank 132, the sludge concentrating tank 133 and the sludge selecting tank 134 are sequentially connected and are linearly arranged in the diameter direction of the inner circle, the four sedimentation tanks 125 are uniformly distributed on both sides of the sludge regeneration module, two sedimentation tanks that are same in side link to each other two by two, and all communicate through the mud pipeline with mud backward flow pond 131, and two sets of a set of setting in the both ends of sedimentation tank of four biological filter 124 are with second treatment area intercommunication, and two good oxygen ponds 123 set up respectively in the other both ends of sedimentation tank 125, and good oxygen pond 123 communicates with each other with biological filter 124 bottom, and communicates with second treatment area, and biological filter 124 is through 4 water distribution bucket water piping connections to sedimentation tank 125.
The hydrolysis acidification tank 111, the anaerobic tank 121 and the anoxic tank 122 are disposed in the second treatment zone.
Specifically, hydrolysis-acidification tank 111 is adjacent to sludge selection tank 134, and hydrolysis-acidification tank 111's both sides are two anaerobism ponds 121, and hydrolysis-acidification tank 111 is connected with two anaerobism ponds 121 respectively through 2 quad slit (each 1), and anaerobism pond 121 communicates through the quad slit with the good oxygen pond 123 of first treatment area, and an oxygen deficiency pond 122 is respectively connected through the quad slit to the other end of two anaerobism ponds 121, all installs one-way check valve on every quad slit.
Each treatment tank is reasonably designed according to the flow direction of sewage and wastewater and the circulating path of activated sludge, the compact layout saves the occupied area and reduces the pipeline cost.
The intensive biochemical pond 100 with activated sludge circulation capability shown in fig. 1 combines a pretreatment subsystem 200, a deep treatment subsystem 300 and an excess sludge treatment subsystem 400 to form a water treatment system. As shown in fig. 2.
The pretreatment subsystem 200 comprises a coarse grating 210, a fine grating 220, a grit chamber 230 and a water collecting tank 240, wherein the coarse grating 210 and the fine grating 220 are used for intercepting floating objects in the mixed wastewater, the grit chamber 230 is used for removing coarse particles such as sand and mud in the mixed wastewater, and the water collecting tank 240 is used for collecting, storing and balancing the quality and quantity of the sewage and the wastewater.
The advanced treatment subsystem 300 comprises a sand filtration tank 310, a micro-filter 320 and an ultraviolet disinfection tank 330, and is used for carrying out advanced treatment on the effluent of the intensive biochemical tank 100.
And the excess sludge treatment subsystem 400 is used for concentrating and dehydrating excess sludge and making mud cakes for outward transportation.
Specifically, the excess sludge treatment subsystem 400 includes: an external sludge thickener 410, a screw stacker 420 and a plate and frame filter press 430.
All equipment operation (including medicine system and aeration system etc.) are implemented the real-time feedback of data by SCADA automatic control system in this application, and all-round assurance system steady operation has practiced thrift a large amount of operation costs.
An example of a water treatment process of an integrated biochemical pond having an activated sludge circulation capability disclosed in the present application will be described in detail with reference to fig. 1 and 3. As shown in the figure, the water treatment process in the intensive biochemical pond is as follows:
and step 100, enabling the primary purified water treated by the pretreatment subsystem to enter a sludge concentration tank, mixing the primary purified water with activated sludge in the sludge concentration tank, and performing tertiary biological selection through a sludge selection tank to obtain secondary purified water.
Specifically, mixed waste water passes through thick grid, thin grid, grit chamber and water catch bowl in proper order, and the large-scale floater of thick grid interception in the mixed waste water, the less floater of thin grid interception in the mixed waste water, the protection water pump, mixed waste water behind the thickness grid, and then get rid of thick granule such as silt particle in the grit chamber, rethread water catch bowl carry on gathering, storage and the equilibrium of quality of water yield, mixed waste water obtains elementary water after the preliminary treatment.
The primary purified water obtained through pretreatment enters a combined biochemical tank for further treatment, firstly enters a sludge concentration tank, high-concentration activated sludge is stored in the sludge concentration tank, the primary purified water and the high-concentration activated sludge are fully mixed, and secondary purified water is obtained through three-level biological selection of a sludge selection tank.
The high-concentration activated sludge in the sludge concentration tank is domesticated and cultured by using special activated Bacteria (Bacteria 1) at the initial stage of system debugging, so that the activity of the activated sludge and the high-efficiency removal rate of pollutants are ensured. After the system starts to operate, the sludge is regenerated by the sludge regeneration system, so that the high activity of the activated sludge is maintained, and the generation amount of excess sludge is reduced.
And 200, hydrolyzing and acidifying the secondary purified water in a hydrolysis acidification tank to obtain tertiary purified water.
Specifically, sewage containing a large amount of required activated sludge enters a hydrolysis acidification tank, the first two stages of anaerobic reaction, namely a hydrolysis fermentation stage and a hydrogen-producing and acetic acid-producing stage, are completed, macromolecular organic matters in the sewage are converted into micromolecular organic matters, so that the biodegradability of the sewage is improved, three-stage purified water is obtained, and then the sewage enters an anaerobic tank.
And 300, sequentially passing the three-stage purified water through an anaerobic tank, an aerobic tank, a biological filter and a sedimentation tank to obtain biochemical purified water.
Specifically, the three-stage purified water is filled in the anaerobic tankAnd completing the methane production stage of the anaerobic reaction. The effluent of the anaerobic tank enters an aerobic tank, and COD and BOD in the sewage5And the effluent of the aerobic tank passes through the biological filter, organic matters in the sewage are further degraded, most of SS is removed, simultaneously sludge loss in the aerobic tank can be reduced, and finally the sewage enters the sedimentation tank from the biological filter through a water inlet pipe of a water distribution barrel to realize sludge-water separation, so that the biochemical purified water is obtained.
In addition, nitrifying liquid in the aerobic tank enters the anoxic tank through a reflux system, and nitrate nitrogen is removed through a denitrification process; the activated sludge is repeatedly circulated between the aerobic tank and the anaerobic tank, so that the aerobic phosphorus absorption and anaerobic phosphorus release capacities of the phosphorus accumulating bacteria are gradually improved, the phosphorus content of the excess sludge is greatly improved, and the phosphorus is efficiently removed by discharging the excess sludge.
Further, the effluent of the intensive biochemical pool is subjected to advanced treatment by an advanced treatment subsystem to obtain final purified water.
Specifically, the biochemical purified water is subjected to advanced treatment through the sand filtration, microfiltration and ultraviolet disinfection processes of the advanced treatment subsystem to obtain final purified water.
In at least one embodiment, the activated sludge concentration is greater than or equal to 40000 mg/L.
The circulation path of the sludge in the mixed wastewater treatment system is as follows: refluxing sludge in the sedimentation tank to a sludge refluxing tank; a part of sludge in the sludge reflux pool reflows to the sludge stabilization pool and returns to the aerobic pool after stabilization; the other part of the sludge enters a sludge concentration tank and a sludge selection tank in turn.
In order to maintain the high activity and durability of the activated sludge, the activated sludge is domesticated and cultured by using special active Bacteria (Bacteria 1) in the initial debugging stage of the whole system, so that the activity of the activated sludge and the high-efficiency removal rate of pollutants are ensured. After the system starts to operate, the sludge is regenerated by the sludge regeneration system, so that the high activity of the activated sludge is maintained, and the generation amount of excess sludge is reduced.
The sludge return tank is used for receiving the sludge in the sedimentation tank and plays a role in transferring, one part of sludge is stabilized by the stabilization tank and then supplements the activated sludge lost by the aerobic tank, so that the concentration of the activated sludge is relatively stable, and the other part of sludge is conveyed to the sludge concentration tank.
The sludge stabilizing tank is used for degrading organic matters in the sludge, reducing the water content of the sludge and eliminating odor.
The sludge concentration tank is used for receiving sludge from the sludge return tank, the return sludge comprises activated sludge, sludge (organic matters) without activity and inorganic sludge, and in the sludge concentration tank, the activated sludge is propagated in a large amount on the basis of the sludge without activity as nutrition, the sludge without activity is consumed as much as possible, the content of the activated sludge is increased to the maximum extent, so that the purpose of activated sludge concentration is achieved, and the concentration of the activated sludge is improved.
The sludge selection tank is used for preventing sludge from swelling; the method comprises the following steps of selecting required strains and biological activity according to the control of an aeration effect and dissolved oxygen conditions, specifically, selecting sludge in a tank from a stabilization tank through a sludge concentration tank, wherein the bacteria are intricate and complex and comprise anaerobic bacteria, aerobic bacteria and facultative bacteria, controlling the aeration effect and the dissolved oxygen conditions through the sludge selection tank, shielding most of the aerobic bacteria, and ensuring that only the anaerobic bacteria and the facultative bacteria are contained in a sludge-water mixture so as to enter a hydrolysis acidification tank. So as to prevent negative influence on the hydrolytic acidification process.
The high activity of the activated sludge is kept by a sludge regeneration system, and special activated Bacteria (Bacteria 1) are supplemented appropriately to acclimate and culture the activated sludge when necessary. The supplement is needed for 3 to 5 years generally.
The present application provides a water treatment system including an intensive biochemical tank having an activated sludge circulation capability with a small excess sludge production, as will be described in detail below with reference to example 1.
Example 1
The excess sludge yield of the water treatment system 1 constructed by the prior art with the treatment capacity of 2000 tons/day and the water treatment system 2 provided by the application and comprising the intensive biochemical pond with the activated sludge circulation capacity is shown in the following table
TABLE 1 comparison of excess sludge yields
Water treatment system 1 Water treatment system 2
Water content of excess sludge 80% 80%
Annual excess sludge production 439 ton to 730 ton 219 ton to 292 ton
Amount of oven-dried sludge 87.6-146 tons 43.8 ton to 58.4 ton
As can be seen from table 1, the annual discharge amount of excess sludge in the water treatment system 2 including the intensive biochemical pond with activated sludge circulation capability provided by the present application is reduced as follows compared with the water treatment system 1 constructed by the prior art: 219-438 tons of sludge with the water content of 80 percent, 43.8-87.6 tons of absolutely dry sludge and greatly reduced residual sludge discharge.
The small footprint of the water treatment system including the integrated biochemical tank with activated sludge circulation provided by the present application is described in detail in example 2 below.
Example 2
Compared with the water treatment system 2 which comprises the intensive biochemical pond with the activated sludge circulation capacity, the water treatment system 1 which is constructed by the existing process and has the treatment capacity of 3000 tons/day has the advantages that the occupied area of the water treatment system 1 is 1.5-3 ten thousand square meters, and the occupied area of the water treatment system 2 which is provided by the application is 0.6-1.2 ten thousand square meters. Compared with the existing water treatment system 1, the water treatment system 2 saves the occupied area by 0.9-1.8 ten thousand square meters, greatly saves the occupied area, and simultaneously saves the cost of accessories such as pipelines and the like due to the compact structure of each treatment pool, thereby having economical efficiency.
In this document, "first", "second", and the like are used only for distinguishing one from another, and do not indicate their degree of importance, order, and the like.
The division of the modules herein is merely a division of logical functions, and other divisions may be possible in actual implementation, for example, a plurality of modules may be combined or integrated in another system. Modules described as separate components may or may not be physically separate.
The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present application should be covered within the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims (3)

1. A water treatment process based on an intensive biochemical pond with activated sludge circulation capacity is characterized in that the intensive biochemical pond with activated sludge circulation capacity comprises the following steps: the system comprises a primary strengthening treatment module, a secondary treatment module and a sludge regeneration module; the primary strengthening treatment module comprises a hydrolysis acidification pool; the secondary treatment module comprises an anaerobic tank, an anoxic tank, an aerobic tank, a biological filter and a sedimentation tank; the sludge regeneration module comprises a sludge backflow tank, a sludge stabilizing tank, a sludge concentration tank and a sludge selection tank; the intensive biochemical pool is provided with an outer circle and an inner circle, and a first treatment area and a second treatment area are formed by the outer circle and the inner circle; the aerobic tank, the biological filter, the sedimentation tank and the sludge regeneration module are arranged in the first treatment area, and the hydrolysis acidification tank, the anaerobic tank and the anoxic tank are arranged in the second treatment area; the sludge return tank is arranged in the sludge stabilizing tank, and the sludge stabilizing tank, the sludge concentration tank and the sludge selection tank are sequentially connected;
the water treatment process based on the intensive biochemical pond with the activated sludge circulation capacity comprises the following steps:
the primary purified water treated by the pretreatment subsystem enters a sludge concentration tank, is mixed with activated sludge in the sludge concentration tank, and is subjected to tertiary biological selection through a sludge selection tank to obtain secondary purified water;
hydrolyzing and acidifying the secondary purified water in a hydrolysis acidification tank to obtain tertiary purified water;
the three-stage purified water sequentially passes through an anaerobic tank, an aerobic tank, a biological filter and a sedimentation tank to obtain biochemical purified water;
the circulation path of the activated sludge in the sludge regeneration module is as follows:
refluxing sludge in the sedimentation tank to a sludge refluxing tank;
a part of sludge in the sludge backflow tank flows back to the sludge stabilizing tank, and returns to the aerobic tank after being stabilized; the other part of the sludge enters a sludge concentration tank and a sludge selection tank in sequence;
wherein, the nitrifying liquid in the aerobic tank enters the anoxic tank through the reflux system to remove nitrogen.
2. The water treatment process of claim 1, wherein the activated sludge concentration is greater than or equal to 40000 mg/L.
3. The water treatment process according to claim 1, wherein the acclimation and culture of the activated sludge are performed by using special active bacteria at the initial stage of the commissioning of the water treatment system.
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