CN112624273B - High-turbidity wastewater pretreatment and synchronous power generation integrated treatment pool - Google Patents

High-turbidity wastewater pretreatment and synchronous power generation integrated treatment pool Download PDF

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CN112624273B
CN112624273B CN202011508243.8A CN202011508243A CN112624273B CN 112624273 B CN112624273 B CN 112624273B CN 202011508243 A CN202011508243 A CN 202011508243A CN 112624273 B CN112624273 B CN 112624273B
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wastewater
turbidity
treatment
power generation
pool
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CN112624273A (en
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董跃
隋明锐
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Hohai University HHU
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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
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
    • C02F1/461—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
    • C02F1/463—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis by electrocoagulation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D21/00—Separation of suspended solid particles from liquids by sedimentation
    • B01D21/0039—Settling tanks provided with contact surfaces, e.g. baffles, particles
    • B01D21/0051—Plurality of tube like channels
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D21/00—Separation of suspended solid particles from liquids by sedimentation
    • B01D21/02—Settling tanks with single outlets for the separated liquid
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M8/00—Fuel cells; Manufacture thereof
    • H01M8/18—Regenerative fuel cells, e.g. redox flow batteries or secondary fuel cells
    • H01M8/184—Regeneration by electrochemical means
    • H01M8/188—Regeneration by electrochemical means by recharging of redox couples containing fluids; Redox flow type batteries
    • 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
    • C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
    • C02F1/461—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
    • C02F1/46104—Devices therefor; Their operating or servicing
    • C02F1/46176—Galvanic cells
    • 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
    • C02F2201/00—Apparatus for treatment of water, waste water or sewage
    • C02F2201/46—Apparatus for electrochemical processes
    • C02F2201/461—Electrolysis apparatus
    • C02F2201/46105—Details relating to the electrolytic devices
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2201/00—Apparatus for treatment of water, waste water or sewage
    • C02F2201/46—Apparatus for electrochemical processes
    • C02F2201/461—Electrolysis apparatus
    • C02F2201/46105—Details relating to the electrolytic devices
    • C02F2201/4612—Controlling or monitoring
    • C02F2201/46125—Electrical variables
    • C02F2201/46135—Voltage
    • 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
    • C02F2209/11—Turbidity
    • 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
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/30—Hydrogen technology
    • Y02E60/50—Fuel cells

Abstract

The invention discloses a high-turbidity wastewater pretreatment and synchronous electricity generation integrated treatment pool which comprises a treatment pool body, a wastewater treatment and electricity generation module, an adjustable resistor and an inclined tube. The wastewater treatment and power generation modules are arranged in each small rectangular tank of the treatment tank body in a square staggered manner. Each wastewater treatment and electricity generation module comprises a rotating shaft, an anode iron net and an air cathode block. Each air cathode block comprises a PVC connecting plate and two rolled cathode plates; the anode iron net and the air cathode block are connected through a lead to form a primary battery loop. According to the invention, suspended matters and the like in high-turbidity wastewater are subjected to coagulating sedimentation removal by the wastewater treatment and power generation module driven by water flow and by a coagulant generated by iron anodic oxidation reaction of the wastewater treatment and power generation module, the cathode module and the anode form a loop to generate power, the modules are mutually independent and are convenient to assemble, disassemble and maintain, and the wastewater can flow in the tank without dead angles through the arc-shaped wall plate, so that the subsequent coagulation clamping groove can conveniently intercept the aggregates.

Description

High-turbidity wastewater pretreatment and synchronous power generation integrated treatment pool
Technical Field
The invention relates to the field of sewage treatment, in particular to a high-turbidity wastewater pretreatment and synchronous power generation integrated treatment tank.
Background
High turbidity water refers to raw water with high turbidity or high silt content. When the silt content in water reaches a certain degree, the silt particles will interfere with each other in the sedimentation process, because the silt particles must be squeezed out of the water with the same volume when being settled, the water is forced to rise, the sedimentation speed of the crowded falling particles is reduced along with the increase of the density of the silt particles in the water, and when the density of the silt particles in the water is high, the sedimentation is hindered.
High turbidity wastewater refers to wastewater containing high concentration suspended pollutants, such as landfill leachate, raw water for chemical industry, textile industry, and printing industry, and wastewater rich in algae. The pretreatment is usually to remove suspended matters, macromolecular organic matters and the like in the wastewater water body by a physicochemical or biological means so as to preliminarily reduce water quality indexes of the water body such as SS, COD, TN, TP and the like, and facilitate the matching of subsequent physicochemical treatment and advanced treatment.
The landfill leachate is taken as an example, the common pretreatment methods at present comprise a coagulating sedimentation method, an electric flocculation method, a biofilm method and the like, but the pretreatment methods have the problems of large dosage consumption, small water yield, equipment failure, more water quality accidents, high water treatment cost, complex management and the like, and namely, the pretreatment methods which can realize the preliminary removal of pollutants and have high efficiency and low cost are lacked.
At present, a dosing coagulation method is generally used for treating landfill leachate in a sewage treatment plant, and is mainly characterized in that polyaluminium chloride (PAC) is added as a coagulant, a series of chemical reactions are carried out after the coagulant enters a water body to generate a polymer and have an adsorption effect on particles in water to form a complex, and then the complex is removed through precipitation. When the addition amount of the coagulant is less, the formed complex is reduced, and the coagulation is not thorough; the addition of coagulant is too large, the adsorption surface is covered, the hydrolysis degree of aluminum salt is reduced, and the coagulation effect is poor. Therefore, the dosage needs to be accurately controlled, but the process needs to consume a large amount of energy such as electric power. In addition, in the process of using the inclined tube sedimentation tank, the sedimentation effect is poor due to uneven water distribution and over-high water flow speed. Based on the above, the invention improves the coagulation effect and reduces the energy consumption by improving the pool body.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a high-turbidity wastewater pretreatment and synchronous electricity generation integrated treatment tank aiming at the defects of the prior art, and the high-turbidity wastewater pretreatment and synchronous electricity generation integrated treatment tank can solve the problems of poor coagulation effect and high energy consumption in the treatment of landfill leachate by a coagulation precipitation method.
In order to solve the technical problems, the invention adopts the technical scheme that:
the utility model provides a high turbidity waste water preliminary treatment and synchronous electrogenesis integration treatment pond, includes treatment pond body, waste water treatment and produces electric module, adjustable resistance and pipe chute.
The treatment pool body comprises a bottom plate, n U-shaped frames and n-1 inverted U-shaped frames.
The n U-shaped frames are arranged in parallel, and two adjacent U-shaped frames share one side wall plate. Each U-shaped frame and the bottom plate form a large rectangular pool and an arc-shaped pool.
Each inverted U-shaped frame comprises an inverted arc-shaped plate and inverted side wall plates connected to two sides of the inverted arc-shaped plate. Two adjacent inverted U-shaped frames share one inverted side wall plate, and n-1 inverted U-shaped frames share n inverted side wall plates. The n pieces of inverted side wall plates are all positioned on the central axis of the n large rectangular pools, and the n large rectangular pools are equally divided into 2n small rectangular pools.
The opening center of every board of falling the arc all faces the corresponding side wall board, and every board of falling the arc all forms an inverted arc pond with the bottom plate.
Inclined pipes are uniformly distributed in each arc-shaped pool and each inverted arc-shaped pool to form 2n-1 inclined pipe sedimentation pools.
A plurality of wastewater treatment and electricity generation modules are arranged in each small rectangular pool along the length direction in a staggered manner.
Each wastewater treatment and power generation module comprises a rotating shaft, an anode iron net and a hollow cathode block. The bottom of pivot is rotated and is installed on the bottom plate that corresponds little rectangular pond, and crisscross and the insulating formula equipartition of positive pole iron mesh and hollow cathode block are at the outer circumferential surface of pivot, and all lie in the footpath of pivot.
Each hollow cathode block comprises two rolled cathode plates and a PVC connecting plate. The two rolled negative plates are parallel to each other and arranged along the radial direction, one ends of the two rolled negative plates are arranged on the rotating shaft, and the other ends of the two rolled negative plates are connected with the PVC connecting plate in a sealing mode. The bottom plate, the rotating shaft, the two rolled negative plates and the PVC connecting plate are enclosed to form a waterproof air cavity.
Each rolled negative plate comprises a stainless steel mesh, a conductive waterproof breathable layer and a capacitance carbon powder layer. The waterproof ventilative layer of electrically conductive sets up on the stainless steel mesh towards air chamber one side, and the setting of electric capacity carbon dust layer is on the stainless steel mesh that deviates from air chamber one side.
All stainless steel nets in each wastewater treatment and electricity generation module are connected in parallel at the positive end of the adjustable resistor through leads, all stainless steel nets in each wastewater treatment and electricity generation module are connected in parallel at the negative end of the adjustable resistor through leads, and when high-turbidity wastewater is used as electrolyte solution, a primary battery loop is formed.
The conductive waterproof breathable layer is rolled conductive carbon powder.
The treatment basin body further includes an initial closure plate and a final closure plate. The initial sealing plate is used for being connected with the side wall plate and the inverted side wall plate at the water inlet in a sealing mode. The termination sealing plate is used for sealing and connecting the side wall plate and the inverted side wall plate at the water outlet.
Each wastewater treatment and power generation module comprises a rotating shaft, two anode iron nets and two hollow cathode blocks. The two anode iron nets and the two hollow cathode blocks are uniformly distributed on the outer circumferential surface of the rotating shaft in a cross-shaped staggered manner.
A coagulating trough is uniformly distributed at the water inlet of each inclined tube sedimentation tank, and 2n-1 coagulating troughs are formed in the same shape. The height of the 2n-1 coagulation clamping grooves is gradually increased along the water flow direction.
The height of 2n-1 coagulation clamp grooves is gradually increased by 0.3cm along the water flow direction.
A high-turbidity wastewater pretreatment and synchronous power generation integrated treatment method comprises the following steps:
step 1, water inlet: the high-turbidity wastewater enters the first small rectangular tank at the most upstream from the water inlet of the treatment tank body through the water inlet pipe.
Step 2, first stirring, wastewater treatment and power generation: the high turbidity waste water entering the first small rectangular tank flows towards the second small rectangular tank. In a small rectangular pond, every waste water treatment and the electrogenesis module that high turbidity waste water passes through will be rotatory along with rivers self-drive, and then realize stirring, electrogenesis and waste water treatment for the first time simultaneously, the concrete performance is as follows:
step 21, first stirring: the kinetic energy of water flow drives the wastewater treatment and the rotating shaft in the electricity generation module to rotate, so that the wastewater passing through the first small rectangular tank is stirred, the coagulation effect is enhanced, and the oxygen mass transfer efficiency is increased.
Step 22, first wastewater treatment: along with the water flow passing through the wastewater treatment and electricity generation module, the high-turbidity wastewater is used as electrolyte solution, so that a conductive primary battery loop is formed among the anode iron mesh, the hollow cathode block and the adjustable resistor which are connected through the conducting wires. And a coagulant containing iron ions, ferrous ions and iron hydroxides is spontaneously generated on the side of the anode iron net, and the coagulant can perform coagulation sedimentation on suspended matters and macromolecular organic matters in the high-turbidity wastewater through the net catching effect. On the side of the hollow cathode block, oxygen enters from the air cavity, and after passing through the conductive carbon powder, reduction reaction occurs at the stainless steel mesh.
Step 23, first power generation: when the wastewater is treated for the first time, the primary battery loop spontaneously and synchronously generates electricity to supply power to the adjustable resistor. In the process of generating electricity, the amount of the coagulant to be generated is determined according to the turbidity and the flow of the high-turbidity wastewater. And then the resistance value of the adjustable resistor is adjusted, so that the yield of the coagulant is adjusted and controlled.
Step 3, first inclined tube precipitation: and (4) allowing the wastewater after the first wastewater treatment to enter a first inclined tube sedimentation tank for inclined tube sedimentation.
Step 4, stirring for the second time, wastewater treatment and power generation: the clear water on the upper part after the first inclined tube sedimentation is finished enters a second small rectangular pool, and in the second small rectangular pool, each wastewater treatment and electricity generation module through which high-turbidity wastewater passes is driven to rotate along with water flow, so that secondary stirring, electricity generation and wastewater treatment are realized simultaneously.
Step 5, stirring for the nth time, treating wastewater and generating electricity: and (4) repeating the steps 2 to 4 until the treated wastewater enters the nth small rectangular pool, and realizing the nth stirring, wastewater treatment and power generation in the nth small rectangular pool.
The number of the wastewater treatment and power generation modules in each small rectangular pool is adjusted according to the high-turbidity wastewater treatment requirement and the actual power generation requirement.
In the step 1, a wastewater turbidity detector and an inflow water flow detector are installed in the water inlet pipe and are respectively used for detecting the turbidity and the inflow water flow of high-turbidity wastewater in the water inlet pipe. In step 23, the resistance of the adjustable resistor is adjusted according to the detected turbidity of the high turbidity wastewater and the inflow rate.
A wastewater turbidity detector and a water inlet flow detector are arranged at the water outlet of each inclined tube sedimentation tank and are respectively used for detecting the turbidity and the water inlet flow of high-turbidity wastewater in the water outlet of the corresponding inclined tube sedimentation tank; and then adjusting the resistance value of the adjustable resistor of each primary battery loop in the small rectangular pool corresponding to the water outlet of the inclined tube sedimentation pool according to the detected turbidity and the water inlet flow of the high-turbidity wastewater.
The invention has the following beneficial effects:
1. through setting up along with rivers self-driven waste water treatment and electrogenesis module, when this waste water treatment and electrogenesis module positive pole iron net produced the hydroxide coagulant of iron ion, ferrous ion iron, rivers can drive this waste water treatment and electrogenesis module and revolve the rotation around the pivot, consume the kinetic energy of some rivers, reduce the velocity of flow, the water distribution is even, promotes the diffusion of coagulant in the pond, realizes getting rid of coagulating sedimentation to suspended solid etc. in the landfill leachate.
2. The hollow cathode block and the anode iron net form a primary battery loop to spontaneously and synchronously generate electricity, so that the energy consumption is reduced, and the coagulant output of the iron net anode can be accurately controlled by adjusting the resistance in the primary battery loop.
3. Each waste water treatment and power generation module are mutually independent, and the assembly, disassembly and maintenance are convenient.
4. Through the curved arc wall body of design for waste water can not have the dead angle in the pond and flow, is convenient for follow-up concrete card groove to the entrapment of aggregate.
5. The inclined pipe is used for increasing the precipitation area, reducing the hydraulic radius and increasing the hydraulic retention time so as to more fully coagulate and settle the high-turbidity wastewater.
6. The coagulation clamping groove lifting the first level through every other treatment section intercepts the in-water aggregate, can in time get rid of the aggregate that each treatment section produced and clear away through the external mud pipe of draw-in groove, reaches the whole purpose of getting rid of the suspended solid high efficiency in the high turbidity waste water.
Drawings
FIG. 1 shows a schematic structural diagram of an integrated treatment tank for high turbidity wastewater pretreatment and synchronous power generation according to the present invention.
Fig. 2 shows a schematic layout of the inclined tube and the concrete chute of the present invention.
FIG. 3 shows a schematic diagram of a wastewater treatment and power generation module of the present invention.
Fig. 4 shows an explosion diagram of a rolled cathode plate according to the invention.
Fig. 5 shows a circuit diagram of a galvanic cell circuit according to the invention.
FIG. 6 is a data diagram showing the operational treatment effect of the integrated treatment tank of the present invention.
FIG. 7 is a diagram showing a square staggered arrangement of wastewater treatment and power generation modules according to the present invention.
Among them are:
10. a treatment tank body; a U-shaped frame; 111. a side wall panel; 112. an arc-shaped wallboard; 12. an inverted U-shaped wall panel; 121. a side wall plate is inverted; 122. to the arc-shaped wall plate; 13. terminating the seal plate; 14. an initial closing plate;
20. a coagulation clamping groove;
30. a wastewater treatment and power generation module; 31. a rotating shaft; 32. a hollow cathode block;
321. rolling the cathode plate; 3211. conductive carbon powder; 3212. a stainless steel mesh; 3212. capacitor carbon powder;
a PVC web; 323. an air chamber; 33. an anode iron mesh; 34. a wire;
40. the resistance can be adjusted;
50. and (4) an inclined tube.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific preferred embodiments.
In the description of the present invention, it is to be understood that the terms "left side", "right side", "upper part", "lower part", etc., indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and that "first", "second", etc., do not represent an important degree of the component parts, and thus are not to be construed as limiting the present invention. The specific dimensions used in the present example are only for illustrating the technical solution and do not limit the scope of protection of the present invention.
As shown in fig. 1 to 5, a high turbidity wastewater pretreatment and synchronous electricity generation integrated treatment tank comprises a treatment tank body 10, a coagulation clamp groove 20, a wastewater treatment and electricity generation module 30, an adjustable resistor 40 and an inclined tube 50.
As shown in FIG. 1, the treatment tank body comprises a bottom plate, n U-shaped frames 11, n-1 inverted U-shaped frames 12, a start closure plate 14 and a finish closure plate 13. In this example, n =3 is preferred.
Each U-shaped frame comprises an arc-shaped wall plate 112 and side wall plates 111 connected to two sides of the arc-shaped wall plate; the n U-shaped frames are arranged in parallel, and two adjacent U-shaped frames share one side wall plate.
Each U-shaped frame and the bottom plate form a large rectangular pool and an arc-shaped pool.
Each inverted U-shaped frame includes an inverted arc plate 122 and an inverted side wall plate 121 connected to both sides of the inverted arc plate. Two adjacent inverted U-shaped frames share one inverted side wall plate, and n-1 inverted U-shaped frames share n inverted side wall plates.
The n pieces of inverted side wall plates are all positioned on the central axis of the n large rectangular pools, and the n large rectangular pools are equally divided into 2n small rectangular pools.
The opening center of every board of falling the arc all faces the corresponding side wall board, and every board of falling the arc all forms an inverted arc pond with the bottom plate.
The initial sealing plate is used for being connected with the side wall plate and the inverted side wall plate at the water inlet in a sealing mode. The termination sealing plate is used for sealing and connecting the side wall plate and the inverted side wall plate at the water outlet.
As shown in figure 2, inclined pipes 50 are uniformly distributed in each arc-shaped pool and each inverted arc-shaped pool to form 2n-1 inclined pipe sedimentation pools. Each of the inclined tubes is preferably 1.2m long and the aperture is preferably 100mm, preferably at an angle of 60 ° to the horizontal.
A coagulating trough 20 is uniformly distributed at the water inlet of each inclined tube sedimentation tank to form 2n-1 coagulating troughs. The height of the 2n-1 coagulation clamping grooves is gradually increased along the water flow direction, in the embodiment, the height of the 2n-1 coagulation clamping grooves is preferably gradually increased by 0.3cm along the water flow direction, and the bottom position of the inclined tube is raised along with the height.
The bottom of every coagulation card groove is preferred to be flat mutually with corresponding little rectangle cell body bottom, and the top is flat mutually with the pipe chute bottom, and the lifting step by step of coagulation card groove can realize holding back step by step to the pollutant, guarantees that the turbidity of final water is minimum.
A plurality of wastewater treatment and electricity generation modules are arranged in each small rectangular pool along the length direction in a staggered manner. In this embodiment, the four adjacent wastewater treatment and power generation modules are preferably square as shown in fig. 7, and the arrangement of the square can further increase the hydraulic flow path, i.e. further increase the deflection, and promote the wastewater to fully contact with each power generation module, so that the coagulation treatment effect can be increased.
The number of the wastewater treatment and power generation modules in each small rectangular pool is specifically adjusted according to the high-turbidity wastewater treatment requirement and the actual power generation requirement.
As shown in fig. 3, each of the wastewater treatment and power generation modules preferably includes a rotating shaft 31, an anode mesh 33, and a hollow cathode block 32. The bottom of the rotating shaft is rotatably installed on the bottom plate corresponding to the small rectangular pool, and the anode iron net and the hollow cathode blocks are uniformly distributed on the outer circumferential surface of the rotating shaft in a staggered mode and are located in the radial direction of the rotating shaft. In this embodiment, the number of the anode iron nets and the number of the hollow cathode blocks are preferably two, and the two anode iron nets and the two hollow cathode blocks are preferably uniformly distributed on the outer circumferential surface of the rotating shaft in a cross-shaped staggered manner. In addition, insulation is required between the anode iron mesh and the cathode air block, otherwise short circuit is caused; therefore, the power generation module composed of the anode iron net 33 and the hollow cathode block 32 needs to be insulated from the rotating shaft so as to limit the current flowing between the anode and the cathode.
The mesh number of the anode iron net is preferably 40 meshes, the specification is preferably 3m × 3m, and the specification of the air cathode plate is also preferably 3m × 3 m.
Each hollow cathode block preferably comprises two rolled cathode plates 321 and a PVC connecting plate 322. The two rolled negative plates are parallel to each other and arranged along the radial direction, one ends of the two rolled negative plates are arranged on the rotating shaft, and the other ends of the two rolled negative plates are connected with the PVC connecting plate in a sealing mode. The bottom plate, the rotating shaft, the two rolled cathode plates and the PVC connecting plate are enclosed to form a waterproof air cavity 323. The air chamber 323 is preferably sized 0.3m × 2.4m × 3m to provide oxygen for the cathode reaction.
As shown in fig. 4, each rolled cathode plate preferably includes a stainless steel mesh 3212, an electrically conductive waterproof breathable layer, and a capacitive carbon powder layer.
The conductive waterproof breathable layer is preferably rolled conductive carbon powder 3211 which is rolled on a stainless steel mesh facing the air cavity. The conductive carbon powder is preferably prepared by rolling active carbon and polytetrafluoroethylene in the presence of ethanol as a solvent.
The capacitance carbon powder layer is preferably capacitance carbon powder 3213 which is rolled on a stainless steel mesh on the side away from the air cavity, and the capacitance carbon powder layer is preferably formed by sintering conductive carbon black and polytetrafluoroethylene in the presence of ethanol as a solvent.
All anode iron nets in each wastewater treatment and power generation module are connected in parallel at the positive end of the adjustable resistor through the lead 34, all stainless steel nets in each wastewater treatment and power generation module are connected in parallel at the negative end of the adjustable resistor through the lead, and when high-turbidity wastewater is used as electrolyte solution, a primary battery loop is formed.
A high-turbidity wastewater pretreatment and synchronous power generation integrated treatment method comprises the following steps.
Step 1, water inlet: the high-turbidity wastewater enters the first small rectangular tank at the most upstream from the water inlet of the treatment tank body through the water inlet pipe.
A wastewater turbidity detector and a water inlet flow detector are installed in the water inlet pipe and are respectively used for detecting turbidity and water inlet flow of high-turbidity wastewater in the water inlet pipe. In step 23, the resistance of the adjustable resistor is adjusted according to the detected turbidity of the high turbidity wastewater and the inflow rate.
Step 2, first stirring, wastewater treatment and power generation: the high turbidity waste water entering the first small rectangular tank flows towards the second small rectangular tank. In a small rectangular pond, every waste water treatment and the electrogenesis module that high turbidity waste water passes through will be rotatory along with rivers self-drive, and then realize stirring, electrogenesis and waste water treatment for the first time simultaneously, the concrete performance is as follows:
step 21, first stirring: the kinetic energy of water flow drives the rotating shaft in the wastewater treatment and electricity generation module to rotate, so that wastewater passing through the first small rectangular tank is stirred, the coagulation effect is enhanced, and the oxygen mass transfer efficiency is increased.
Step 22, first wastewater treatment: along with the water flow passing through the wastewater treatment and electricity generation module, the high-turbidity wastewater is used as electrolyte solution, so that a conductive primary battery loop is formed among the anode iron mesh, the hollow cathode block and the adjustable resistor which are connected through the conducting wires. And a coagulant containing iron ions, ferrous ions and iron hydroxides is spontaneously generated on the side of the anode iron net, and the coagulant can perform coagulation sedimentation on suspended matters and macromolecular organic matters in the high-turbidity wastewater through the net catching effect. On the side of the hollow cathode block, oxygen enters from the air cavity, and after passing through the conductive carbon powder, reduction reaction occurs at the stainless steel mesh.
The main purposes of the conductive carbon powder are water resistance and air permeability, wherein water resistance means that a solution cannot penetrate through a conductive carbon powder layer and cannot leak, and air permeability means that oxygen can penetrate through the conductive carbon powder layer to reach a capacitance carbon powder layer and oxygen reduction reaction occurs between the oxygen and electrons in the conductive carbon powder layer. The main purpose of the capacitor carbon powder is to catalyze the oxygen reduction reaction of oxygen (penetrated by the conductive carbon powder layer), electrons (penetrated by the iron anode) and hydrogen ions (penetrated in the solution), and the catalytic property is mainly determined by the pore structure inside the capacitor carbon powder (the pore structure inside the conductive carbon powder cannot form catalytic sites, so the oxygen reduction reaction cannot be catalyzed).
Step 23, first power generation: when the wastewater is treated for the first time, the primary battery loop spontaneously and synchronously generates electricity to supply power to the adjustable resistor. In the process of generating electricity, the amount of the coagulant to be generated is determined according to the turbidity and the flow of the high-turbidity wastewater. And then the resistance value of the adjustable resistor is adjusted, so that the yield of the coagulant is adjusted and controlled.
The turbidity and the flow rate of the high-turbidity wastewater determine the total amount of pollutants to be treated, and the yield of the coagulant needs to be adapted to the total amount of pollutants. The overall principle is that the more the total amount of pollutants, the smaller the resistance, the larger the current, the more coagulant is produced; the lower the total amount of contaminants, the higher the resistance, the lower the current, and the lower the amount of coagulant produced.
The concrete adjustment of the coagulant production is as follows.
(1) Relationship between coagulant yield and resistance
MFe= (U×t)/(R×F) ×0.5×M
MFeThe yield of the iron salt coagulant (unit: g), U is the voltage (unit: V) at two ends of the adjustable resistor, t is the unit time (unit: s), R is the resistance value (unit: omega) of the adjustable resistor, F is the Faraday constant (unit: 96485C/mol), and 0.5 is the stoichiometric number (Fe and Fe)2+In an electron stoichiometric relationship between 1mol of electrons for 0.5mol of Fe), M is the molar mass of iron (unit: 56 g/mol).
(2) Relationship between coagulant yield and total amount of pollutants
According to the early test result, the relation between the total amount of pollutants and the coagulant accords with linear fitting
MFe =0.024×Q +8.133
MFeThe yield of the ferric salt coagulant (unit: g), Q is the total amount of pollutants, and the product of turbidity and flow (unit: NTU × m)3）。
(3) Resistance versus total amount of contaminants
Setting the hydraulic retention time of the wastewater in the tank body to be 3h, and obtaining the relation between the total pollutant amount and the adjustable resistance according to the relation between the (1) and the (2):
R= (U×10800×0.5×MFe)/[(0.024×Q +8.133) ×F]
therefore, the total amount of pollutants to be treated is determined according to the turbidity and the flow of inlet water, a variable resistance method is used in the regulation and control process, the voltage at two ends of the resistor is monitored, and the final external resistor resistance value is determined.
Step 3, first inclined tube precipitation: and (4) allowing the wastewater after the first wastewater treatment to enter a first inclined tube sedimentation tank for inclined tube sedimentation.
A wastewater turbidity detector and a water inlet flow detector are arranged at the water outlet of each inclined tube sedimentation tank and are respectively used for detecting the turbidity and the water inlet flow of high-turbidity wastewater in the water outlet of the corresponding inclined tube sedimentation tank; and then adjusting the resistance value of the adjustable resistor of each primary battery loop in the small rectangular pool corresponding to the water outlet of the inclined tube sedimentation pool according to the detected turbidity and the water inlet flow of the high-turbidity wastewater.
Step 4, stirring for the second time, wastewater treatment and power generation: the clear water on the upper part after the first inclined tube sedimentation is finished enters a second small rectangular pool, and in the second small rectangular pool, each wastewater treatment and electricity generation module through which high-turbidity wastewater passes is driven to rotate along with water flow, so that secondary stirring, electricity generation and wastewater treatment are realized simultaneously.
Step 5, stirring for the nth time, treating wastewater and generating electricity: and (4) repeating the steps 2 to 4 until the treated wastewater enters the nth small rectangular pool, and realizing the nth stirring, wastewater treatment and power generation in the nth small rectangular pool.
Wherein, FIG. 6 shows a data diagram of the operation treatment effect of the integrated treatment tank of the present invention.
Although the preferred embodiments of the present invention have been described in detail, the present invention is not limited to the details of the embodiments, and various equivalent modifications can be made within the technical spirit of the present invention, and the scope of the present invention is also within the scope of the present invention.

Claims (10)

1. A high-turbidity wastewater pretreatment and synchronous power generation integrated treatment method is characterized in that: the method comprises the following steps:
step 1, water inlet: high-turbidity wastewater enters a first small rectangular tank positioned at the most upstream from a water inlet of the treatment tank body through a water inlet pipe;
step 2, first stirring, wastewater treatment and power generation: the high-turbidity wastewater entering the first small rectangular tank flows towards the second small rectangular tank; in a small rectangular pond, every waste water treatment and the electrogenesis module that high turbidity waste water passes through will be rotatory along with rivers self-drive, and then realize stirring, electrogenesis and waste water treatment for the first time simultaneously, the concrete performance is as follows:
step 21, first stirring: the kinetic energy of water flow drives a rotating shaft in the wastewater treatment and power generation module to rotate, so that the wastewater passing through the first small rectangular tank is stirred, the coagulation effect is enhanced, and the oxygen mass transfer efficiency is increased;
step 22, first wastewater treatment: along with the water flow passing through the wastewater treatment and electricity generation module, high-turbidity wastewater is used as electrolyte solution, so that a conductive primary battery loop is formed among the anode iron mesh, the hollow cathode block and the adjustable resistor which are connected through the conducting wires; a coagulant containing iron ions, ferrous ions and iron hydroxide is spontaneously generated on the side of the anode iron net, and the coagulant can perform coagulation sedimentation on suspended matters and macromolecular organic matters in the high-turbidity wastewater through the net catching effect; on the side of the hollow cathode block, oxygen enters from an air cavity, and after passing through the conductive carbon powder, a reduction reaction occurs at the stainless steel net;
step 23, first power generation: during the first wastewater treatment, the primary battery loop spontaneously and synchronously generates electricity to supply power to the adjustable resistor; in the process of generating electricity, determining the amount of the coagulant to be generated according to the turbidity and the flow of the high-turbidity wastewater; then regulating the resistance value of the adjustable resistor to regulate the yield of the coagulant;
the specific adjusting formula for adjusting the resistance value of the adjustable resistor is as follows:
R= (U×t×0.5×M)/[(0.024×Q +8.133) ×F]
wherein, R is the resistance of the adjustable resistor, and the unit is: omega; u is the voltage at both ends of the adjustable resistor, unit: v; t is the hydraulic retention time of the wastewater in the tank body, unit: s; m is the molar mass of iron, unit: 56 g/mol; q is the total amount of contaminants, being the product of turbidity and flow, in units: NTU × m3(ii) a F is the faraday constant, unit: 96485C/mol;
therefore, the total amount of pollutants to be treated is determined according to the turbidity and the flow of inlet water, a variable resistance method is used in the regulation and control process, the voltage at two ends of the resistor is monitored, and the final external resistor resistance value is determined;
step 3, first inclined tube precipitation: the wastewater after the primary wastewater treatment enters a first inclined tube sedimentation tank for inclined tube sedimentation;
step 4, stirring for the second time, wastewater treatment and power generation: the upper clear water after the first inclined tube sedimentation is finished enters a second small rectangular pool, and in the second small rectangular pool, each wastewater treatment and power generation module through which high-turbidity wastewater passes is driven to rotate along with water flow, so that secondary stirring, power generation and wastewater treatment are realized at the same time;
step 5, stirring for the nth time, treating wastewater and generating electricity: and (4) repeating the steps 2 to 4 until the treated wastewater enters the nth small rectangular pool, and realizing the nth stirring, wastewater treatment and power generation in the nth small rectangular pool.
2. The integrated high turbidity wastewater pretreatment and synchronous power generation treatment method according to claim 1, wherein: the number of the wastewater treatment and power generation modules in each small rectangular pool is adjusted according to the high-turbidity wastewater treatment requirement and the actual power generation requirement.
3. The integrated high turbidity wastewater pretreatment and synchronous power generation treatment method according to claim 1, wherein: in the step 1, a wastewater turbidity detector and an inflow water flow detector are installed in the water inlet pipe and are respectively used for detecting the turbidity and the inflow water flow of high-turbidity wastewater in the water inlet pipe.
4. The integrated high turbidity wastewater pretreatment and synchronous power generation treatment method according to claim 1, wherein: a wastewater turbidity detector and a water inlet flow detector are arranged at the water outlet of each inclined tube sedimentation tank and are respectively used for detecting the turbidity and the water inlet flow of high-turbidity wastewater in the water outlet of the corresponding inclined tube sedimentation tank; and then adjusting the resistance value of the adjustable resistor of each primary battery loop in the small rectangular pool corresponding to the water outlet of the inclined tube sedimentation pool according to the detected turbidity and the water inlet flow of the high-turbidity wastewater.
5. A high turbidity waste water pretreatment and synchronous electricity generation integrated treatment pool based on any one of claims 1 to 4, which is characterized in that: comprises a treatment pool body, a wastewater treatment and power generation module, an adjustable resistor and an inclined tube;
the treatment pool body comprises a bottom plate, n U-shaped frames and n-1 inverted U-shaped frames;
the n U-shaped frames are arranged in parallel, and two adjacent U-shaped frames share one side wall plate; each U-shaped frame and the bottom plate form a large rectangular pool and an arc pool;
each inverted U-shaped frame comprises an inverted arc-shaped plate and inverted side wall plates connected to two sides of the inverted arc-shaped plate; two adjacent inverted U-shaped frames share one inverted side wall plate, and n-1 inverted U-shaped frames share n inverted side wall plates; the n inverted side wall plates are all positioned on the central axis of the n large rectangular pools, and the n large rectangular pools are all divided into 2n small rectangular pools;
the center of the opening of each inverted arc-shaped plate faces to the corresponding side wall plate, and each inverted arc-shaped plate and the bottom plate form an inverted arc-shaped pool;
inclined pipes are uniformly distributed in each arc-shaped pool and each inverted arc-shaped pool to form 2n-1 inclined pipe sedimentation pools;
a plurality of wastewater treatment and power generation modules are arranged in each small rectangular tank along the length direction in a staggered manner;
each wastewater treatment and power generation module comprises a rotating shaft, an anode iron net and a hollow cathode block; the bottom end of the rotating shaft is rotatably installed on the bottom plate of the corresponding small rectangular pool, and the anode iron nets and the hollow cathode blocks are staggered, insulated and uniformly distributed on the outer circumferential surface of the rotating shaft and are positioned in the radial direction of the rotating shaft;
each hollow cathode block comprises two rolled cathode plates and a PVC connecting plate; the two rolled negative plates are parallel to each other and arranged along the radial direction, one ends of the two rolled negative plates are both arranged on the rotating shaft, and the other ends of the two rolled negative plates are hermetically connected with the PVC connecting plate; the bottom plate, the rotating shaft, the two rolled negative plates and the PVC connecting plate are enclosed to form a waterproof air cavity;
each rolling cathode plate comprises a stainless steel mesh, a conductive waterproof breathable layer and a capacitance carbon powder layer; the conductive waterproof breathable layer is arranged on the stainless steel mesh on one side facing the air cavity, and the capacitance carbon powder layer is arranged on the stainless steel mesh on one side away from the air cavity;
all anode iron nets in each wastewater treatment and electricity generation module are connected in parallel at the positive end of the adjustable resistor through leads, all stainless steel nets in each wastewater treatment and electricity generation module are connected in parallel at the negative end of the adjustable resistor through leads, and when high-turbidity wastewater is used as electrolyte solution, a primary battery loop is formed.
6. The integrated high turbidity wastewater pretreatment and synchronous power generation treatment tank of claim 5, wherein: the conductive waterproof breathable layer is rolled conductive carbon powder.
7. The integrated high turbidity wastewater pretreatment and synchronous power generation treatment tank of claim 5, wherein: the treatment pool body also comprises an initial sealing plate and a termination sealing plate; the starting sealing plate is used for sealing and connecting the side wall plate and the inverted side wall plate at the water inlet; the termination sealing plate is used for sealing and connecting the side wall plate and the inverted side wall plate at the water outlet.
8. The integrated high turbidity wastewater pretreatment and synchronous power generation treatment tank of claim 5, wherein: each wastewater treatment and power generation module comprises a rotating shaft, two anode iron nets and two hollow cathode blocks; the two anode iron nets and the two hollow cathode blocks are uniformly distributed on the outer circumferential surface of the rotating shaft in a cross-shaped staggered manner.
9. The integrated high turbidity wastewater pretreatment and synchronous power generation treatment tank of claim 5, wherein: a coagulation clamping groove is uniformly distributed at the water inlet of each inclined tube sedimentation tank, and 2n-1 coagulation clamping grooves are formed in the coagulation clamping grooves; the height of the 2n-1 coagulation clamping grooves is gradually increased along the water flow direction.
10. The integrated high turbidity wastewater pretreatment and synchronous power generation treatment tank of claim 5, wherein: the height of 2n-1 coagulation clamp grooves is gradually increased by 0.3cm along the water flow direction.
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