CN112624529A - Microorganism sewage treatment system and sewage treatment method - Google Patents

Microorganism sewage treatment system and sewage treatment method Download PDF

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CN112624529A
CN112624529A CN202110064052.5A CN202110064052A CN112624529A CN 112624529 A CN112624529 A CN 112624529A CN 202110064052 A CN202110064052 A CN 202110064052A CN 112624529 A CN112624529 A CN 112624529A
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tank
sewage
biological
water
inlet pipe
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王宏志
韩高阳
董亮
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Xinjiang Herun Water Industry Co ltd
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Xinjiang Herun Water Industry 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
    • 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
    • C02F1/44—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
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
    • 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
    • C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
    • C02F1/5281—Installations for water purification using chemical agents
    • 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
    • C02F2001/007—Processes including a sedimentation step
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2101/00—Nature of the contaminant
    • C02F2101/30—Organic compounds
    • 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
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2209/00—Controlling or monitoring parameters in water treatment
    • C02F2209/02—Temperature
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2209/00—Controlling or monitoring parameters in water treatment
    • C02F2209/22—O2
    • 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
    • C02F2301/08—Multistage treatments, e.g. repetition of the same process step under different conditions
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2303/00—Specific treatment goals
    • C02F2303/04—Disinfection
    • 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
    • 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
    • C02F3/06—Aerobic processes using submerged filters
    • 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
    • C02F3/34—Biological treatment of water, waste water, or sewage characterised by the microorganisms used

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  • Life Sciences & Earth Sciences (AREA)
  • Hydrology & Water Resources (AREA)
  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Biological Treatment Of Waste Water (AREA)

Abstract

The invention discloses a microbial sewage treatment system and a sewage treatment method, comprising the following steps: the sewage treatment device comprises a filter tank, a primary sedimentation tank, a biological tank, a secondary sedimentation tank and a strengthening treatment tank which are sequentially connected through pipelines, wherein the secondary sedimentation tank sequentially bypasses a sludge concentration tank and a sludge digestion tank through pipelines, a water inlet is formed in the filter tank, a water outlet is formed in the strengthening treatment tank, a grid is arranged in the filter tank, and an aeration device is arranged in the biological tank. The treated sewage can reach the discharge standard, and has a three-stage treatment system, the technology in the fields of physics, biology and chemistry is utilized to effectively filter and degrade the mixed impurities of inorganic matters and organic matters in the sewage, and an aeration device is arranged in the biological tank, so that the microbial agent in an aerobic section can play the greatest role in the biological tank, the sewage treatment effect is improved, the discharge reaches the standard, and the operation is stable.

Description

Microorganism sewage treatment system and sewage treatment method
Technical Field
The invention relates to the technical field of sewage treatment, in particular to a microbial sewage treatment system and a sewage treatment method.
Background
Nowadays, environmental pollution is more and more serious, sewage belongs to one of important pollution, and therefore attention of people to the serious degree of water pollution is attracted, sewage generated in industrial production, agriculture, medical treatment, life and the like has complex mixtures of inorganic matters and organic matters in various forms, some sewage exists in various forms such as floating and suspended solid particles, some sewage exists in various forms such as colloidal or gelatinous diffusants and the like, and sewage is purified and then discharged by adopting various sewage treatment means such as physics, biology, chemistry and the like; the sewage treatment is to treat production, domestic sewage and the like, reaches the specified discharge standard, and is an important facility for protecting the environment; the existing sewage treatment systems and some sewage treatment methods are also continuously improved and perfected to play the greatest role. Therefore, there is a need for a microbial wastewater treatment system and a wastewater treatment method, which can improve the wastewater treatment technology.
Disclosure of Invention
In this summary, concepts in a simplified form are introduced that are further described in the detailed description. This summary of the invention is not intended to identify key features or essential features of the claimed subject matter, nor is it intended to be used as an aid in determining the scope of the claimed subject matter.
To at least partially solve the above problems, the present invention provides a microbial wastewater treatment system comprising: the sewage treatment device comprises a filter tank, a primary sedimentation tank, a biological tank, a secondary sedimentation tank and a strengthening treatment tank which are sequentially connected through pipelines, wherein the secondary sedimentation tank sequentially bypasses a sludge concentration tank and a sludge digestion tank through pipelines, a water inlet is formed in the filter tank, a water outlet is formed in the strengthening treatment tank, a grid is arranged in the filter tank, and an aeration device is arranged in the biological tank.
Preferably, the aeration device comprises a shell, an air inlet pipe, a water inlet pipe and a water outlet pipe, wherein the water inlet pipe is arranged on one side of the shell and is in sealed connection with the shell, the air inlet pipe is arranged on the other side of the shell and is in sealed connection with the shell, and the water outlet pipes are arranged in plurality and are uniformly arranged on the outer peripheral wall of the lower side of the shell; the bottom of casing is equipped with the axis of rotation, the axis of rotation is hollow structure, the one end and the drive arrangement who sets up in the casing below of axis of rotation are connected, the other end of axis of rotation through rotate the piece with the inlet tube intercommunication, the outside cover of axis of rotation is equipped with the interior casing rather than sealing connection, the one end of intake pipe stretches into the inside of interior casing, the lateral wall lower extreme of interior casing is equipped with a plurality of first through-holes, be equipped with a plurality of second through-holes on the lateral wall of axis of rotation.
Preferably, the outer side wall of the rotating shaft is further provided with blades, and the blades are spirally arranged.
Preferably, the water inlet pipe comprises a first water inlet pipe and a second water inlet pipe, one end of the first water inlet pipe is communicated with the rotating shaft, the second water inlet pipe is arranged below the first water inlet pipe, and one end of the second water inlet pipe and the other end of the first water inlet pipe are both communicated with the biological pond; and a plurality of water outlet devices are arranged on the lower side of the second water inlet pipe.
Preferably, the air outlet of the air inlet pipe is provided with a sealing device, the sealing device comprises a turnover connecting piece and a sealing piece, and the sealing piece is connected with the air outlet through the turnover connecting piece.
Preferably, still include feed arrangement, feed arrangement's discharge gate stretches into in the sewage of biological pond, feed arrangement includes main inlet pipe, a plurality of branch inlet pipe, and is a plurality of branch inlet pipe parallel arrangement, just branch inlet pipe with main inlet pipe intercommunication, be equipped with the feed inlet on the main inlet pipe, be equipped with a plurality ofly on the lateral wall of branch inlet pipe the discharge gate.
Preferably, the strengthening treatment tank comprises a coagulation sedimentation tank, an immersed ultrafiltration membrane and a disinfection tank which are sequentially connected through a pipeline, wherein the water inlet end of the coagulation sedimentation tank is connected with the water outlet end of the secondary sedimentation tank, and the disinfection tank is connected with the water outlet.
The invention also provides a microbial sewage treatment method, which comprises the following steps:
s100, lifting sewage by a lifting pump, then entering a filtering tank from a water inlet, sequentially passing the sewage through a grating and a grit chamber in the filtering tank, and entering a primary sedimentation tank after sand-water separation;
s200, enabling the sewage precipitated by the primary sedimentation tank to enter a biological tank, reacting with the materials put in the biological tank, and simultaneously carrying out aeration treatment;
s300, allowing the sewage treated in the biological tank to enter a secondary sedimentation tank for sedimentation, allowing a part of the sludge after sedimentation to flow back to the primary sedimentation tank or the biological tank for secondary treatment, allowing the other part of the sludge to enter a sludge concentration tank and a sludge digestion tank in sequence, and conveying the sludge out after dehydration and drying equipment;
s400, enabling the sewage treated by the secondary sedimentation tank to enter a strengthening treatment tank for strengthening treatment, and then discharging the sewage through a water outlet.
Preferably, the step S200 includes:
s201, before materials are put into the biological pond, the biological pond is divided into two biological pond units which are not communicated, and the materials are put into an aerobic section in one biological pond unit;
s202, reacting sewage in the biological tank unit in which the materials are put with the materials, carrying out aeration treatment simultaneously, discharging the sewage in the biological tank unit in which the materials are not put into the biological tank unit in batches according to the result after the reaction, and combining the two biological tank units.
Preferably, a control module is arranged in the biological tank, and when aeration treatment is performed, the control module is used for monitoring and controlling dissolved oxygen in sewage, and the specific calculation method of the dissolved oxygen is as follows:
step A1: based on the temperature T of the sewage in the biological tank measured by the control module, the temperature T of the sewage in the biological tank meets the following energy conservation equation:
Figure BDA0002903694840000031
wherein, VxAs the velocity of the water in the x direction, VyVelocity of water in the y direction, VzIs the velocity of water in the z direction, ε is the thermal conductivity of water, ρ is the density of water, C is the specific heat capacity of water,
Figure BDA0002903694840000034
is partial derivative, x, y and z are respectively length, width and height of the biological pool;
step A2: calculating the dissolved oxygen amount tau during aeration in the biological tank according to the measured temperature T of the sewage in the biological tank:
τ＝τ1-exp(-μr*α(20-r)*t)(τ1-τ0)
wherein, tau1Is the saturated dissolved oxygen concentration in water, exp is an exponential function, muTThe total oxygen transfer coefficient of the sewage in the biological tank at T ℃, alpha is the temperature coefficient, tau0The concentration of dissolved oxygen in water when aeration is not started;
step A3: judging whether the dissolved oxygen amount tau in the step A2 meets the preset value tau or notPreparation of4-6mg/L, if accord with the default then show that the effect that the material carries out oxidative decomposition to the organic matter in sewage accords with the expectation effect, if not reach the default, utilize for sewage heating in the biological pond improves dissolved oxygen volume, control module control sets up heating device in the biological pond begins to heat, and the temperature of sewage satisfies following energy conservation equation in the biological pond this moment:
Figure BDA0002903694840000032
wherein W is the heat quantity emitted by the heating device in unit time, Δ T is the time, σ is the kinematic viscosity, TmIs the average temperature of water at time m, Tm+1Is the average temperature of water at the moment m +1, N is the number of angsierters,
Figure BDA0002903694840000033
is air heat conductivity coefficient, A is contact area between water surface of the biological pond and air, and TQi (Qi)Is the temperature of the air;
step A4: based on the energy conservation equation of step A3, the average temperature T of water at time mmAnd the average temperature T of water at the moment m +1 can be obtained under the condition that the heat quantity W emitted by the heating device in unit time is knownm+1And substituting the obtained temperature value into the formula in the step A2, and repeating the step A2 and the step A3 to enable the dissolved oxygen in the biological pond to meet the preset value.
Compared with the prior art, the invention at least comprises the following beneficial effects:
the sewage treated by the microbial sewage treatment system and the sewage treatment method can reach the discharge standard, and the sewage treatment system has three stages, and can effectively filter and degrade inorganic and organic mixed impurities in the sewage by utilizing the technologies in the fields of physics, biology and chemistry, and the aeration device is arranged in the biological tank, so that the microbial agent in an aerobic section can play the maximum role in the biological tank, the sewage treatment effect is improved, the discharge reaches the standard, and the operation is stable.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:
FIG. 1 is a schematic view of a process flow of a microbial wastewater treatment system and a wastewater treatment method according to the present invention.
FIG. 2 is a schematic structural view of an aeration apparatus in a microbial wastewater treatment system according to the present invention.
FIG. 3 is an enlarged schematic view of a sealing device at A in FIG. 2 of a microbial wastewater treatment system according to the present invention.
FIG. 4 is a schematic structural diagram of a feeding device in a microbial wastewater treatment system according to the present invention.
Fig. 5 a is a schematic diagram of a microbial agent added in a biological tank in an experiment of the microbial wastewater treatment method of the present invention.
Fig. 5 b is a schematic diagram of a biological pond after adding a biological agent in an experiment of the method for treating microbial wastewater according to the present invention.
Fig. 6 c is a schematic diagram of the sludge property in the optimal state after the biological agent is added into the biological tank for ten days in the experiment of the microbial sewage treatment method of the present invention.
Fig. 6 d is a schematic diagram of a zoogloea under microscopic examination after a biological agent is added into a biological pool for ten days in an experiment of the method for treating microbial wastewater of the present invention.
1 is a shell, 2 is an air inlet pipe, 3 is an water inlet pipe, 3-1 is a first water inlet pipe, 3-2 is a second water inlet pipe, 3-3 is a water outlet device, 4 is a water outlet pipe, 5 is a rotating shaft, 5-1 is a second through hole, 5-2 is a blade, 6 is a driving device, 7 is a rotating part, 8 is an inner shell, 8-1 is a first through hole, 9 is a sealing device, 9-1 is a turnover connecting piece, 9-2 is a sealing sheet, 10 is a feeding device, 10-1 is a discharging hole, 10-2 is a main feeding pipe, 10-3 is a branch feeding pipe, and 10-4 is a feeding hole.
Detailed Description
The present invention is further described in detail below with reference to the drawings and examples so that those skilled in the art can practice the invention with reference to the description.
It will be understood that terms such as "having," "including," and "comprising," as used herein, do not preclude the presence or addition of one or more other elements or groups thereof.
As shown in fig. 1 to 4, the present invention provides a microbial sewage treatment system and a sewage treatment method, including: the sewage treatment device comprises a filter tank, a primary sedimentation tank, a biological tank, a secondary sedimentation tank and a strengthening treatment tank which are sequentially connected through pipelines, wherein the secondary sedimentation tank sequentially bypasses a sludge concentration tank and a sludge digestion tank through pipelines, a water inlet is formed in the filter tank, a water outlet is formed in the strengthening treatment tank, a grid is arranged in the filter tank, and an aeration device is arranged in the biological tank.
The strengthening treatment tank comprises a coagulation sedimentation tank, an immersed ultrafiltration membrane and a disinfection tank which are sequentially connected through a pipeline, wherein the water inlet end of the coagulation sedimentation tank is connected with the water outlet end of the secondary sedimentation tank, and the disinfection tank is connected with the water outlet.
The working principle of the technical scheme is as follows: the sewage treatment system is divided into three levels, a filter tank and a primary sedimentation tank belong to primary treatment, the filter tank comprises a grating, an aeration grit chamber and a hydrolysis acidification tank which are arranged in sequence, solid pollutants in a suspension state in the sewage are mainly removed, and the BOD (biochemical oxygen demand) of the sewage subjected to the primary treatment can be generally removed by about 30 percent and cannot reach the discharge standard; then the sewage after the primary treatment sequentially enters a biological tank and a secondary sedimentation tank for secondary treatment, wherein the biological tank is an aeration biological tank, materials, namely a microbial agent, are added into the biological tank in the process, and an aeration device is utilized to carry out aeration treatment in an aerobic section, so that organic pollutants in a colloid and dissolved state in the sewage are mainly removed, the removal rate can reach more than 90 percent, and the organic pollutants reach the emission standard, wherein the microbial agent can be Bacillus subtilis, Bacillus circulans, Bacillus xylanilyticus, Bacillus mucilaginosus and Bacillus subtilis; finally, the wastewater enters a strengthening treatment tank, namely, the wastewater sequentially passes through a coagulating sedimentation tank, an immersed ultrafiltration membrane and a disinfection tank, and is further treated with refractory organic matters, nitrogen, phosphorus and other soluble inorganic matters capable of causing water eutrophication, and the main methods comprise a biological nitrogen and phosphorus removal method, a coagulating sedimentation method, a sand filtration method, an activated carbon adsorption method, an ion exchange method, an electroosmosis analysis method and the like; and the product meets the emission standard after three-stage treatment.
The beneficial effects of the above technical scheme are that: the sewage treated by the microbial sewage treatment system can reach the discharge standard, and the sewage treatment system has a three-stage treatment system, effectively filters and degrades inorganic matter and organic matter mixed impurities in the sewage by utilizing the technologies in the fields of physics, biology and chemistry, is provided with an aeration device in a biological tank, ensures that a microbial agent in an aerobic section plays the maximum role in the biological tank, increases the sewage treatment effect, enables the discharge to reach the standard, and is stable in operation.
In one embodiment, the aeration device comprises a shell 1, an air inlet pipe 2, an water inlet pipe 3 and a water outlet pipe 4, wherein the water inlet pipe 3 is arranged on one side of the shell 1 and is in sealed connection with the shell 1, the air inlet pipe 2 is arranged on the other side of the shell 1 and is in sealed connection with the shell, and the water outlet pipe 4 is arranged in a plurality and is uniformly arranged on the outer peripheral wall of the lower side of the shell 1; the bottom of casing 1 is equipped with axis of rotation 5, axis of rotation 5 is hollow structure, the one end of axis of rotation 5 is connected with drive arrangement 6 that sets up in casing 1 below, the other end of axis of rotation 5 through rotate 7 with inlet tube 3 intercommunication, the outside cover of axis of rotation 5 is equipped with rather than sealing connection's interior casing 8, the one end of intake pipe 2 stretches into the inside of interior casing 8, the lateral wall lower extreme of interior casing 8 is equipped with a plurality of first through-holes 8-1, be equipped with a plurality of second through-holes 5-1 on the lateral wall of axis of rotation 5.
The working principle of the technical scheme is as follows: be equipped with water circulating system in the biological pond, aeration equipment's inlet tube 3 is connected with water circulating system, sewage enters into in the axis of rotation 5 from inlet tube 3, and simultaneously, intake pipe 2 and air supply system connect, carry the air through intake pipe 2 in 8 to the interior casing, the sewage that enters into in the axis of rotation 5 flows in from a plurality of second through-holes 5-1 to the interior casing 8 that is equipped with in the axis of rotation 5, 6 drive shaft rotations of drive arrangement simultaneously stir air and sewage, fully contact, then sewage flows in to the casing from first through-hole 8-1 on the interior casing 8, flow out to the biological pond in from a plurality of outlet pipes 4, converge into the sewage in the biological pond.
The beneficial effects of the above technical scheme are that: through the design of the structure, the aeration device simultaneously injects water and air into the device, and the water and the air are fully stirred and contacted in the device, so that a high-activity biological membrane is attached to the surface of the material injected into the biological pond, and after the biological membrane is mature, organic matters in the sewage are adsorbed and decomposed by microorganisms in the biological membrane, and finally the effect of purifying the water quality is achieved. Aerobic microorganisms grow on the surface layer of the biological film, organic matters are degraded through aerobic metabolism of the microorganisms, and end-point products are water, carbon dioxide and nitrogen trioxide. The aeration device increases the oxygen content in the sewage, is favorable for materials in an aerobic section in the aeration biological tank to react with organic matters in the sewage by utilizing sufficient oxygen in the sewage, increases the sewage treatment effect and ensures that the water is more fully purified.
In one embodiment, the outer side wall of the rotating shaft 5 is further provided with a blade 5-2, and the blade 5-2 is spirally arranged.
The working principle of the technical scheme is as follows: when the rotating shaft 5 rotates, the blades 5-2 rotate along with the rotating shaft 5, so that water in the inner shell 8 is in a spiral shape, and further, air from the air inlet pipe 2 is driven by the blades 5-2 to be in full contact with sewage.
The beneficial effects of the above technical scheme are that: through the design of above-mentioned structure, make the better dissolution of oxygen in the air in sewage, and then the biggest effect of performance material.
In one embodiment, the water inlet pipe 3 comprises a first water inlet pipe 3-1 and a second water inlet pipe 3-2, one end of the first water inlet pipe 3-1 is communicated with the rotating shaft 5, the second water inlet pipe 3-2 is arranged below the first water inlet pipe 3-1, and one end of the second water inlet pipe 3-2 and the other end of the first water inlet pipe 3-1 are both communicated with the biological pond; a plurality of water outlet devices 3-3 are arranged at the lower side of the second water inlet pipe 3-2.
The working principle of the technical scheme is as follows: sewage directly enters the rotating shaft 5 from the first water inlet pipe 3-1 and contacts with air input by the air inlet pipe 2, enters the plurality of water outlet devices 3-3 from the second water inlet pipe 3-2 and sprays into the shell 1, and fully contacts with oxygen which is not completely dissolved in the inner shell 8 again, so that the utilization rate of the oxygen is maximized.
The beneficial effects of the above technical scheme are that: through the design of the structure, oxygen in the air is not easy to dissolve in water, so the water outlet device 3-3 arranged on the second water pipe can ensure that the oxygen which is not dissolved can be fully contacted with sewage again, and the improvement of the dissolution rate of the oxygen is facilitated.
In one embodiment, the air outlet of the air inlet pipe 2 is provided with a sealing device 9, the sealing device 9 comprises a turnover connecting piece 9-1 and a sealing piece 9-2, and the sealing piece 9-2 is connected with the air outlet through the turnover connecting piece 9-1.
The working principle of the technical scheme is as follows: when the air inlet pipe 2 inputs air into the shell, impact force is applied to one side, attached to the air outlet, of the sealing sheet 9-2, namely the external pressure intensity applied to the sealing sheet 9-2 is larger than the internal pressure intensity of the aeration device, the sealing sheet 9-2 is opened, the air inlet pipe 2 smoothly conveys air into the aeration device, when the air inlet pipe 2 stops conveying air, the pressure intensity applied to the sealing sheet 9-2 in the aeration device is larger than the external pressure intensity, the sealing sheet 9-2 is immediately attached to the air outlet, and the air outlet is sealed.
The beneficial effects of the above technical scheme are that: through the design of the structure, when the air inlet pipe 2 stops air transmission, the sealing sheet 9-2 can rapidly seal the air outlet, so that the sewage is prevented from flowing back into the air inlet pipe 2 to influence the use.
In one embodiment, the biological pond further comprises a feeding device 10, a discharge port 10-1 of the feeding device 10 extends into the sewage of the biological pond, the feeding device 10 comprises a main feeding pipe 10-2 and a plurality of branch feeding pipes 10-3, the branch feeding pipes 10-3 are arranged in parallel, the branch feeding pipes 10-3 are communicated with the main feeding pipe 10-2, a feed port 10-4 is arranged on the main feeding pipe 10-2, and a plurality of discharge ports 10-1 are arranged on the side wall of the branch feeding pipe 10-3.
The working principle of the technical scheme is as follows: when materials are put into the biological pond, the materials are put into the main feeding pipe 10-2 from the feeding port 10-4, respectively enter each branch feeding pipe 10-3, and are discharged from the discharging port 10-1 positioned in the sewage to enter the sewage.
The beneficial effects of the above technical scheme are that: through the design of above-mentioned structure, the position of dispersible feeding makes the even spilling of material in sewage, carries out abundant reaction with sewage, increases sewage treatment effect.
As shown in fig. 1, a method for treating sewage by microorganisms comprises the following steps:
s100, lifting sewage by a lifting pump, then entering a filtering tank from a water inlet, sequentially passing the sewage through a grating and a grit chamber in the filtering tank, and entering a primary sedimentation tank after sand-water separation;
s200, enabling the sewage precipitated by the primary sedimentation tank to enter a biological tank, reacting with the materials put in the biological tank, and simultaneously carrying out aeration treatment;
s300, allowing the sewage treated in the biological tank to enter a secondary sedimentation tank for sedimentation, allowing a part of the sludge after sedimentation to flow back to the primary sedimentation tank or the biological tank for secondary treatment, allowing the other part of the sludge to enter a sludge concentration tank and a sludge digestion tank in sequence, and conveying the sludge out after dehydration and drying equipment;
s400, enabling the sewage treated by the secondary sedimentation tank to enter a strengthening treatment tank for strengthening treatment, and then discharging the sewage through a water outlet.
The working principle of the technical scheme is as follows: the sewage treatment system is divided into three grades, the sewage enters a first-stage treatment after being lifted by a lifting pump, the sewage enters a filter tank from a water inlet, the sewage sequentially passes through a grating and a grit chamber in the filter tank, wherein the grit chamber can select an aeration grit chamber, a communicated regulating tank and a hydrolysis acidification tank can be arranged behind the grit chamber to prepare for the next-stage treatment by regulating the pH value and the like, and the sewage separated by sand water enters a primary sedimentation tank to remove solid pollutants in a suspended state in the sewage; then the sewage precipitated by the primary sedimentation tank enters a secondary treatment, namely enters a biological tank, reacts with the materials put in the biological tank and is subjected to aeration treatment at the same time; the sewage treated in the biological tank enters a secondary sedimentation tank for sedimentation, one part of the sludge after sedimentation flows back to the primary sedimentation tank or the biological tank for secondary treatment, the other part of the sludge sequentially enters a sludge concentration tank and a sludge digestion tank, and the sludge is transported out after being dewatered and dried by equipment, so that organic pollutants in a colloid and dissolved state in the sewage are mainly removed; and finally, the sewage treated by the secondary sedimentation tank enters a strengthening treatment tank for strengthening treatment, namely the sewage sequentially passes through a coagulation sedimentation tank, an immersed ultrafiltration membrane and a disinfection tank, and is further treated with refractory organic matters, nitrogen, phosphorus and other soluble inorganic matters capable of causing water eutrophication, and then the sewage is discharged through a water outlet.
The beneficial effects of the above technical scheme are that: the sewage treated by the method can reach the discharge standard, and has three-stage treatment, inorganic and organic mixed impurities in the sewage are effectively filtered and degraded by utilizing the technology in the fields of physics, biology and chemistry, and aeration treatment is carried out in the biological tank, so that the aerobic section microbial inoculum can play the maximum role in the biological tank, the sewage treatment effect is improved, the discharge reaches the standard, and the operation is stable.
In one embodiment, the step S200 includes:
s201, before materials are put into the biological pond, the biological pond is divided into two biological pond units which are not communicated, and the materials are put into an aerobic section in one biological pond unit;
s202, reacting sewage in the biological tank unit in which the materials are put with the materials, carrying out aeration treatment simultaneously, discharging the sewage in the biological tank unit in which the materials are not put into the biological tank unit in batches according to the result after the reaction, and combining the two biological tank units.
The working principle of the technical scheme is as follows: after a certain amount of materials are put into one biological pond unit, the materials and organic matters in the sewage fully react, then the sewage in the other biological pond unit is added into the biological pond unit into which the materials are put in batches, during the period, the materials, namely the microbial inoculum, exert the impact resistance, the putting amount of carbon sources (glucose and sodium acetate) required by the reaction during the period is reduced, and during the subsequent material putting, the putting amount of PAC (polyaluminium chloride) is correspondingly reduced.
The beneficial effects of the above technical scheme are that: the feeding of materials is reduced, the energy is saved, and the cost is reduced.
According to the method for treating the microbial sewage provided by the invention,
designing a sewage treatment experiment according to the following sewage treatment water quality requirements, wherein the design scale is 4.0 ten thousand meters3(d) actual water treatment amount is about 1.2 ten thousand meters3/d：
Figure BDA0002903694840000081
The sewage treatment method is designed as the method for treating the microbial sewage, which comprises the following steps: the first-stage treatment adopts a grating, an aeration grit chamber, an adjusting tank and a hydrolysis acidification tank, the second-stage treatment adopts a biological tank (oxidation ditch method) and a secondary sedimentation tank, the third-stage treatment adopts a coagulating sedimentation tank and an immersed ultrafiltration membrane method, a residual sludge system adopts a diaphragm plate-and-frame filter press, and the water content is less than or equal to 60 percent.
Dividing the biological tank into a No. 1 biological tank and a No. 2 biological tank, adding the biological agent into an aerobic section of the No. 2 biological tank, wherein the time from the beginning of an experiment to the end of the experiment is 33 days, and adding the biological agent for 7 times.
As shown in fig. 5, after the biological agent is added for 3 days, the water quality of the biological pool is obviously changed, the odor of the biological pool 2 disappears, then the sewage in the biological pool 1 is merged into the biological pool 2, the merging is completed in four days, and the biological pool 1 is stopped, during the period, the biological agent exerts the impact resistance capability, the stable operation of data is ensured, the phenomenon that the data greatly fluctuate after the two biological pools are merged does not occur, the aim of merging the biological pools into the biological pool 1 to operate is realized, and the cost is reduced.
As shown in FIG. 6, about 10 days, the properties of the activated sludge in the biological pond are obviously changed, the settleability is good, the zoogloea structure is compact, and the activity is good.
After the biological agent is continuously added for 3 times, namely the adding of carbon sources (glucose and sodium acetate) is stopped on the fourth day, the average adding of the carbon sources is 1.2 tons per day before, and 36 tons of carbon sources are saved in total by 33 days.
The PAC (polyaluminium chloride) addition is gradually reduced at the 16 th day, the average PAC addition is 2 tons before the day, and the PAC is saved by 20 tons in total by the 33 th day.
And (3) sludge reduction, wherein under the conditions of long-term reasonable application and good field operation management, the sludge discharge time of the system is reduced by 30-50% compared with that under the same water inlet condition, and the sludge reduction is 50%.
As in the following table: the biological pond is combined into one, the addition of a carbon source is stopped, the outlet data of the biochemical section still shows quite stable after the flocculant is reduced, the average value of the COD (Chemical Oxygen Demand) at the outlet is 38mg/L, and the removal rate is more than 75%; the average value of ammonia nitrogen is 1.9mg/L, and the removal rate is more than 95%; the average value of the total phosphorus is 0.07mg/L, and the removal rate is more than 90 percent; the average value of the total nitrogen is 7mg/L, and the removal rate is more than 75%.
Figure BDA0002903694840000091
In one embodiment, a control module is arranged in the biological tank, and is used for monitoring and controlling the dissolved oxygen in the sewage during the aeration treatment, and the specific control calculation method of the dissolved oxygen is as follows:
step A1: based on the temperature T of the sewage in the biological tank measured by the control module, the temperature T of the sewage in the biological tank meets the following energy conservation equation:
Figure BDA0002903694840000092
wherein, VxAs the velocity of the water in the x direction, VyVelocity of water in the y direction, VzIs the velocity of water in the z direction, ε is the thermal conductivity of water, ρ is the density of water, C is the specific heat capacity of water,
Figure BDA0002903694840000103
is partial derivative, x, y and z are respectively length, width and height of the biological pool;
step A2: calculating the dissolved oxygen amount tau during aeration in the biological tank according to the measured temperature T of the sewage in the biological tank:
τ＝τ1-exp(-μT*α(20-T)*t)(τ1-τ0)
wherein, tau1Is the saturated dissolved oxygen concentration in water, exp is an exponential function, muTThe total oxygen transfer coefficient of the sewage in the biological tank at T ℃, alpha is the temperature coefficient, T is the time, tau0The dissolved oxygen concentration in water when aeration is not started；
Step A3: judging whether the dissolved oxygen amount tau in the step A2 meets the preset value tau or notPreparation of4-6mg/L, if accord with the default then show that the effect that the material carries out oxidative decomposition to the organic matter in sewage accords with the expectation effect, if not reach the default, utilize for sewage heating in the biological pond improves dissolved oxygen volume, control module control sets up heating device in the biological pond begins to heat, and the temperature of sewage satisfies following energy conservation equation in the biological pond this moment:
Figure BDA0002903694840000101
wherein W is the heat quantity emitted by the heating device in unit time, Δ T is the time, σ is the kinematic viscosity, TmIs the average temperature of water at time m, Tm+1Is the average temperature of water at the moment m +1, N is the Nurserl number,
Figure BDA0002903694840000102
is air heat conductivity coefficient, A is contact area between water surface of the biological pond and air, and TQi (Qi)Is the temperature of the air;
step A4: based on the energy conservation equation of step A3, the average temperature T of water at time mmAnd the average temperature T of water at the moment m +1 can be obtained under the condition that the heat quantity W emitted by the heating device in unit time is knownm+1And substituting the obtained temperature value into the formula in the step A2, and repeating the step A2 and the step A3 to enable the dissolved oxygen in the biological pond to meet the preset value.
The working principle of the technical scheme is as follows: substituting the temperature measured in the step A1 into the formula in the step A2 to calculate a dissolved oxygen amount value, wherein alpha in the step A2 is a temperature coefficient and takes a value of 1.024, comparing the obtained dissolved oxygen amount with a preset value of 4-6mg/L, if the dissolved oxygen amount value does not meet the preset value, performing the step A3, starting a heating device, repeating the steps A2 and A3 until the dissolved oxygen amount is controlled within a range of 4-6mg/L, and stopping heating.
The beneficial effects of the above technical scheme are that: by adopting the calculation method, the temperature of the water in the biological pond at the natural temperature can be accurately measured by considering parameters such as the density, the heat conductivity coefficient, the flow velocity and the like of the water, the dissolved oxygen can be accurately measured by adopting the calculation method in the step A2, the dissolved oxygen is compared with the preset value of the dissolved oxygen according to the step A3, whether the preset condition is met or not is judged, the dissolved oxygen is generally controlled to be 4-6mg/L, the higher the temperature of the water is, the larger the dissolved oxygen is, if the preset condition is not met, the water temperature can be raised by starting the heating device, the dissolved oxygen meets the preset value, the temperature of the water after the heating device is started is calculated by comprehensively considering the heat emitted by the heating device and the heat exchange condition of the water in the biological pond and the natural condition, namely, the water temperature is calculated by considering factors such as the temperature of the air and the heat conductivity; but the dissolved oxygen volume in the biological pond of real-time supervision is to realize automatic control, guarantee the required dissolved oxygen volume of the reaction of organic matter and material in the sewage, and then realize the abundant reaction of material and organic matter, resources are saved promotes sewage treatment effect.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the invention.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; may be mechanically coupled, may be electrically coupled or may be in communication with each other; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
While embodiments of the invention have been disclosed above, it is not limited to the applications set forth in the description and the embodiments, which are fully applicable in various fields of endeavor to which the invention pertains, and further modifications may readily be made by those skilled in the art, it being understood that the invention is not limited to the details shown and described herein without departing from the general concept defined by the appended claims and their equivalents.

Claims (10)

1. A microbial wastewater treatment system, comprising: the sewage treatment device comprises a filter tank, a primary sedimentation tank, a biological tank, a secondary sedimentation tank and a strengthening treatment tank which are sequentially connected through pipelines, wherein the secondary sedimentation tank sequentially bypasses a sludge concentration tank and a sludge digestion tank through pipelines, a water inlet is formed in the filter tank, a water outlet is formed in the strengthening treatment tank, a grid is arranged in the filter tank, and an aeration device is arranged in the biological tank.
2. The microbial sewage treatment system according to claim 1, wherein the aeration device comprises a shell (1), an air inlet pipe (2), an water inlet pipe (3) and a water outlet pipe (4), the water inlet pipe (3) is arranged on one side of the shell (1) and is in sealed connection with the shell, the air inlet pipe (2) is arranged on the other side of the shell (1) and is in sealed connection with the shell, the water outlet pipe (4) is arranged in a plurality and is uniformly arranged on the outer peripheral wall of the lower side of the shell (1); the bottom of casing (1) is equipped with axis of rotation (5), axis of rotation (5) are hollow structure, the one end and the drive arrangement (6) of setting in casing (1) below of axis of rotation (5) are connected, the other end of axis of rotation (5) through rotate piece (7) with inlet tube (3) intercommunication, the outside cover of axis of rotation (5) is equipped with interior casing (8) rather than sealing connection, the one end of intake pipe (2) stretches into the inside of interior casing (8), the lateral wall lower extreme of interior casing (8) is equipped with a plurality of first through-holes (8-1), be equipped with a plurality of second through-holes (5-1) on the lateral wall of axis of rotation (5).
3. The microbial sewage treatment system of claim 2, wherein the outer side wall of the rotating shaft (5) is further provided with blades (5-2), and the blades (5-2) are spirally arranged.
4. The microbial sewage treatment system according to claim 2, wherein the water inlet pipe (3) comprises a first water inlet pipe (3-1) and a second water inlet pipe (3-2), one end of the first water inlet pipe (3-1) is communicated with the rotating shaft (5), the second water inlet pipe (3-2) is arranged below the first water inlet pipe (3-1), and one end of the second water inlet pipe (3-2) and the other end of the first water inlet pipe (3-1) are both communicated with the biological pond; a plurality of water outlet devices (3-3) are arranged on the lower side of the second water inlet pipe (3-2).
5. A microbiological sewage treatment system according to claim 2 wherein said air inlet pipe (2) is provided with a sealing means (9) at the air outlet, said sealing means (9) comprising a flip-over connector (9-1) and a sealing plate (9-2), said sealing plate (9-2) being connected to said air outlet through said flip-over connector (9-1).
6. The microbial sewage treatment system according to claim 1, further comprising a feeding device (10), wherein a discharge port (10-1) of the feeding device (10) extends into sewage of the biological pond, the feeding device (10) comprises a main feeding pipe (10-2) and a plurality of branch feeding pipes (10-3), the branch feeding pipes (10-3) are arranged in parallel, the branch feeding pipes (10-3) are communicated with the main feeding pipe (10-2), a feed port (10-4) is arranged on the main feeding pipe (10-2), and a plurality of discharge ports (10-1) are arranged on the side wall of the branch feeding pipes (10-3).
7. The microbial sewage treatment system of claim 1, wherein the strengthening treatment tank comprises a coagulation sedimentation tank, an immersed ultrafiltration membrane and a disinfection tank which are sequentially connected through a pipeline, wherein a water inlet end of the coagulation sedimentation tank is connected with a water outlet end of the secondary sedimentation tank, and the disinfection tank is connected with the water outlet.
8. A method of microbial wastewater treatment, comprising:
s100, lifting sewage by a lifting pump, then entering a filtering tank from a water inlet, sequentially passing the sewage through a grating and a grit chamber in the filtering tank, and entering a primary sedimentation tank after sand-water separation;
s200, enabling the sewage precipitated by the primary sedimentation tank to enter a biological tank, reacting with the materials put in the biological tank, and simultaneously carrying out aeration treatment;
s300, allowing the sewage treated in the biological tank to enter a secondary sedimentation tank for sedimentation, allowing a part of the sludge after sedimentation to flow back to the primary sedimentation tank or the biological tank for secondary treatment, allowing the other part of the sludge to enter a sludge concentration tank and a sludge digestion tank in sequence, and conveying the sludge out after dehydration and drying equipment;
s400, enabling the sewage treated by the secondary sedimentation tank to enter a strengthening treatment tank for strengthening treatment, and then discharging the sewage through a water outlet.
9. The method of claim 8, wherein the step S200 comprises:
s201, before materials are put into the biological pond, the biological pond is divided into two biological pond units which are not communicated, and the materials are put into an aerobic section in one biological pond unit;
s202, reacting sewage in the biological tank unit in which the materials are put with the materials, carrying out aeration treatment simultaneously, discharging the sewage in the biological tank unit in which the materials are not put into the biological tank unit in batches according to the result after the reaction, and combining the two biological tank units.
10. The microbial sewage treatment method of claim 8, wherein a control module is arranged in the biological tank, and is used for monitoring and controlling the dissolved oxygen in the sewage during the aeration treatment, and the specific calculation method of the dissolved oxygen is as follows:
step A1: based on the temperature T of the sewage in the biological tank measured by the control module, the temperature T of the sewage in the biological tank meets the following energy conservation equation:
Figure FDA0002903694830000021
wherein, VxAs the velocity of the water in the x direction, VyVelocity of water in the y direction, VzIs the velocity of water in the z direction, ε is the thermal conductivity of water, ρ is the density of water, C is the specific heat capacity of water,
Figure FDA0002903694830000022
is partial derivative, x, y and z are respectively length, width and height of the biological pool;
step A2: calculating the dissolved oxygen amount tau during aeration in the biological tank according to the measured temperature T of the sewage in the biological tank:
τ＝τ1-exp(-μT*α(20-T)*t)(τ1-τ0)
wherein, tau1Is the saturated dissolved oxygen concentration in water, exp is an exponential function, muTThe total oxygen transfer coefficient of the sewage in the biological tank at T ℃, alpha is the temperature coefficient, T is the time, tau0The concentration of dissolved oxygen in water when aeration is not started;
step A3: judging whether the dissolved oxygen amount tau in the step A2 meets the preset value tau or notPreparation ofIf the preset value is not met, the effect that the materials are used for carrying out oxidative decomposition on the organic matters in the sewage is in accordance with the expected effect, if the preset value is not reached, the sewage in the biological tank is heated to improve the dissolved oxygen amount, and the control module controls the heating device arranged in the biological tank to start to dissolve the organic matters in the sewage, so that the biological tank is heated to beHeating, wherein the temperature of the sewage in the biological tank at the moment meets the following energy conservation equation:
Figure FDA0002903694830000031
wherein W is the heat quantity emitted by the heating device in unit time, Δ T is the time, σ is the kinematic viscosity, TmIs the average temperature of water at time m, Tm+1Is the average temperature of water at the moment m +1, N is the number of angsierters,
Figure FDA0002903694830000032
is air heat conductivity coefficient, A is contact area between water surface of the biological pond and air, and TQi (Qi)Is the temperature of the air;
step A4: based on the energy conservation equation of step A3, the average temperature T of water at time mmAnd the average temperature T of water at the moment m +1 can be obtained under the condition that the heat quantity W emitted by the heating device in unit time is knownm+1And substituting the obtained temperature value into the formula in the step A2, and repeating the step A2 and the step A3 to enable the dissolved oxygen in the biological pond to meet the preset value.
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