CN112794442A

CN112794442A - Carbon source adding device and adding method based on biochemical treatment process

Info

Publication number: CN112794442A
Application number: CN202110087808.8A
Authority: CN
Inventors: 王维忠; 陈光胜; 李为; 赵正刚; 陈传孙; 王文婧; 胡波; 马鹏; 王学文
Original assignee: Chongqing Banan Drainage Co ltd
Current assignee: Chongqing Haoyang Water Affairs Construction Administration Co ltd
Priority date: 2021-01-22
Filing date: 2021-01-22
Publication date: 2021-05-14
Anticipated expiration: 2041-01-22
Also published as: CN112794442B

Abstract

The invention discloses a carbon source adding device and method based on a biochemical treatment process, wherein the adding device comprises a blending structure, a detection structure and a control system; the blending structure comprises a stirring structure and a feeding structure, the stirring structure is used for stirring and mixing the carbon source and water, and the feeding structure is used for feeding the carbon source with the required weight into the stirring barrel within the interval time; the second flowmeter in the detection structure is used for detecting the water inlet volume in unit time, the TN online automatic monitor is used for detecting the TN value of the inlet water, and the COD online automatic monitor is used for detecting the COD value of the inlet water; the control system comprises a processor and a controller, and coordinates and controls the allocation system to allocate and add the carbon source through data measured by the detection structure; in the invention, the adding method uses the adding device, realizes automatic and reasonable adding of the carbon source according to the water inlet condition, has low labor intensity, avoids a large amount of waste of the carbon source, and simultaneously has better denitrification effect brought by adding the carbon source by reasonably setting the adding point.

Description

Carbon source adding device and adding method based on biochemical treatment process

Technical Field

The invention relates to the technical field of sewage treatment, in particular to a carbon source adding device and method based on a biochemical treatment process.

Background

Sewage treatment refers to a process of purifying sewage to meet the water quality requirement of discharging the sewage into a certain water body or reusing the sewage. The sewage treatment plant is a sewage treatment facility which is built around a city and is specially used for treating urban sewage, and sewage generated in various fields of buildings, agriculture, traffic, energy, petrifaction, environmental protection, urban landscape, medical treatment, catering and the like in the city enters the sewage treatment plant through a sewage pipe network for treatment. For the treatment of municipal sewage, strict control requirements on nitrogen and phosphorus pollutants are generally met, and a treatment method with a strong dephosphorization and denitrification function is generally selected, such as: AO method, A2O method, oxidation ditch method, SBR method, biological filter method, etc.

Wherein, the AO method, the A2O method, the oxidation ditch method and the SBR method belong to the activated sludge method, the activated sludge method is a biochemical treatment process which mainly depends on the activated sludge to treat the sewage, the activated sludge contains complex microbial populations which mainly comprise bacteria, protozoa, algae and the like; the activated sludge process is provided with a biochemical treatment area, and the sewage is dephosphorized and denitrified by the biochemical treatment area, wherein the biochemical treatment area generally comprises an anaerobic treatment area, an anoxic treatment area and an aerobic treatment area, the anaerobic treatment area and the aerobic treatment area are used for removing phosphorus in sewage, and the anoxic treatment area and the aerobic treatment area are used for removing nitrogen in sewage.

The denitrification of the activated sludge process is biological denitrification, and the biological nitrification and denitrification are carried out to convert organic nitrogen and ammonia nitrogen in the sewage into nitrogen gas to be discharged, so as to achieve the purpose of denitrification, for example: the ammonia nitrogen is firstly converted into nitrate by nitrifying bacteria under the aerobic condition, then is reduced into nitrite by nitrosobacteria, and is finally reduced into nitrogen by denitrifying bacteria. In order to improve the activity of the strains for biological denitrification and ensure the biological denitrification effect of the sewage, a carbon source is generally added into the sewage to provide energy and substances required by growth for the strains.

At present, a sewage treatment plant generally sets a carbon source adding point at a water inlet end of a biochemical treatment area, then workers calculate a required carbon source according to the flow rate, the inlet water TN value, the inlet water COD value, the discharge standard TN value and the discharge standard COD value of the sewage in the previous day, and then the carbon source is allocated and added, and the manual allocation and addition of the carbon source has the disadvantages of high labor intensity, easy manual influence and poor stability and reliability; meanwhile, the discharge of urban sewage is easily impacted by rainwater and other abnormal water sources, so that the fluctuation of sewage flow, inlet water TN value and inlet water COD value is large, the biological denitrification effect can be ensured by adding excessive carbon sources generally, and the adding point is arranged at the water inlet end of a biochemical treatment area, so that the content of the carbon source in each stage of biochemical treatment cannot be adjusted, the effective utilization rate of the carbon source is low, the waste of the carbon source is also caused, and the cost of sewage treatment is greatly increased.

Disclosure of Invention

In view of the above problems in the prior art, the first technical problem to be solved by the present invention is: the method of manually adding the carbon source has the problems of high labor intensity and serious waste of the carbon source.

The second technical problem to be solved by the present invention is: the existing carbon source adding mode has the problems of low carbon source utilization rate and serious carbon source waste.

In order to solve the first technical problem, the invention adopts the following technical scheme: a carbon source adding device based on a biochemical treatment process comprises a blending structure, a detection structure and a control system.

The blending structure comprises a stirring structure and a feeding structure. The stirring structure comprises a stirring barrel, a water inlet pipe and a water outlet pipe. The stirring barrel is of a cylindrical structure with a cavity, and a first partition plate and a second partition plate are horizontally arranged in the stirring barrel from top to bottom.

The top of first baffle is equipped with first stirring leaf in the agitator, is equipped with agitator motor in the agitator between first baffle and the second baffle, agitator motor's the vertical upwards of output shaft, agitator motor's output shaft extend to the top and the first stirring leaf fixed connection of first baffle, vertically be equipped with the conduction pipe between first baffle and the second baffle in the agitator, the upper end of conduction pipe extends to the upside of first baffle, and the lower extreme of conduction pipe extends to the downside of second baffle, and the position that the conduction pipe is located between first baffle and the second baffle is equipped with the conduction valve.

The side of going up of agitator is equipped with the pan feeding hole, pan feeding hole and agitator coaxial line, pan feeding hole and the inside intercommunication of agitator. The one end of inlet tube passes the side of going up of agitator inside to the agitator, and the inlet tube communicates with the part of the inside first baffle top of agitator, and the other end and the water source intercommunication of inlet tube, and the position that the inlet tube is close to the agitator is equipped with water intaking valve and first flowmeter, the downside that the agitator was passed to the one end of outlet pipe is inside to the agitator, and the outlet pipe communicates with the part of the inside second baffle below of agitator, and the position that the outlet pipe is close to the agitator is equipped with outlet valve and variable pump.

The feeding structure comprises a storage box, a chute plate, a blocking plate, a pushing cylinder, a weighing sensor and a supporting plate. The inside cylindric cavity that is of storage box, the side opening of going up of storage box, the bottom in the storage box is equipped with a plurality of blanking holes, the blanking hole is vertical through-hole.

The backup pad level sets up in the below of storage box, and the backup pad has the round hole with the inside cavity coaxial line of storage box, the diameter of round hole is greater than the diameter of the inside cavity of storage box, and the round hole is vertical through-hole. Weighing sensor is four, and four weighing sensor are located the position that is close to the storage box four corners between storage box and the backup pad respectively, and weighing sensor's sense terminal and storage box downside fixed connection, side fixed connection on weighing sensor and the backup pad.

The draw runner is two, and two draw runners are along the fixed downside that sets up at the storage box of fore-and-aft direction, the barrier plate level sets up between two draw runners, and the last side of barrier plate offsets with the region that a plurality of blanking holes of storage box downside correspond, and both ends respectively with corresponding draw runner sliding fit about the barrier plate, and the barrier plate can be followed the fore-and-aft direction and slided. The pushing cylinder is fixedly arranged on the supporting plate, the telescopic end of the pushing cylinder is arranged forwards, and the telescopic end of the pushing cylinder is fixedly connected with the rear side face of the blocking plate.

The feeding structure is located above the stirring barrel, the supporting plate is fixedly connected with the stirring barrel, the diameter of the round hole is smaller than that of the feeding hole, and the round hole and the feeding hole are coaxial.

The detection structure comprises a second flowmeter, a TN (twisted nematic) online automatic monitor and a COD (chemical oxygen demand) online automatic monitor, wherein the second flowmeter is used for detecting the water inlet volume of the sewage treatment plant in unit time, the TN online automatic monitor is used for detecting the water inlet TN value of the sewage treatment plant, and the COD online automatic monitor is used for detecting the water inlet COD value of the sewage treatment plant. The TN online automatic monitor and the COD online automatic monitor are both the prior art.

The control system comprises a processor and a controller, wherein a signal input end of the processor is respectively connected with the weighing sensor, the first flowmeter, the second flowmeter, the TN online automatic monitor and the COD online automatic monitor, a signal output end of the processor is connected with a signal input end of the controller, and a signal output end of the controller is respectively connected with the water inlet valve, the water outlet valve, the variable pump, the conduction valve, the stirring motor and the push cylinder.

According to the adding device, the water inlet volume, the water inlet TN value and the water inlet COD value of a sewage treatment plant in unit time are obtained through a detection structure, and the control system calculates the weight value of a carbon source to be added in the interval time between two detections of the detection structure through the water inlet volume, the water inlet TN value, the water inlet COD value, the emission standard TN value and the emission standard COD value in unit time; the control system controls the allocation structure to act to allocate the carbon source, the feeding structure drops the carbon source with the required weight to the stirring barrel within the interval time through the weighing function of the weighing sensor, simultaneously, the water inlet valve, the first flow meter and the stirring motor are opened, water and the carbon source are mixed and stirred while water is added into the stirring barrel to obtain a carbon source water solution, the first flow meter is used for feeding back the amount of the injected water, then the conducting valve is opened, the carbon source aqueous solution enters a region below a second partition plate in the stirring barrel through the conducting pipe, finally the water outlet valve and the variable pump are started, the carbon source aqueous solution is conveyed to a carbon source feeding point at a stable flow rate through the water outlet pipe to finish the carbon source feeding within the interval time, because the carbon source is allocated by the allocation structure for a certain time, the control system controls the allocation structure to allocate the carbon source in the next interval time period according to the latest data measured by the detection structure before the carbon source is added in the current interval time period. The continuous automatic adding of the carbon source is realized by reciprocating in this way, so that the labor intensity is greatly reduced, and meanwhile, the carbon source aqueous solution in the interval time period is prepared according to the data measured by the second flow meter, the TN online automatic monitor and the COD online automatic monitor, so that the adding amount of the carbon source is more frequent along with the change of the water inlet flow, the water inlet TN value and the water inlet COD value, the adding amount of the carbon source is more in line with the requirement, and the problem of serious waste of the carbon source is effectively solved.

Preferably, a first disc motor and a second stirring blade are further arranged in the storage box. The fixed bottom that sets up in the storage box of first disc motor, the output shaft of first disc motor is vertical upwards, second stirring leaf is located the top of first disc motor, and the downside of second stirring leaf offsets with the bottom in the storage box, and second stirring leaf and the output shaft fixed connection of first disc motor, first disc motor are connected with the signal output part of controller.

When the feeding structure carries out feeding, the telescopic end of the pushing cylinder contracts to drive the blocking plate to move backwards, so that the blanking hole at the bottom of the storage box is not blocked any more, and a carbon source enters the stirring barrel through the blanking hole, the round hole and the feeding hole in sequence; however, because the carbon source in the storage box is in a stable state, the blanking hole is not blocked any more in time, and the situation that the carbon source is difficult to fall through the blanking hole or the falling speed is slow is likely to occur; through setting up first disc motor and second stirring leaf, when needs blanking, first disc motor drives the rotation of second stirring leaf for the carbon source in the storage box can't maintain comparatively stable state, thereby makes the carbon source fall from the blanking hole fast, makes the allotment structure accurate quick to the allotment of carbon source.

Preferably, a blanking dispersing structure is further arranged between the supporting plate and the stirring barrel and comprises a blanking baffle, a blanking table and a connecting rod.

The blanking baffle is hollow round platform structure, and blanking baffle and agitator coaxial line, the one end of blanking baffle minor diameter up, the upper end and the backup pad downside fixed connection of blanking baffle, the lower extreme of blanking baffle is located the pan feeding downthehole, the lateral surface of blanking baffle and the pore wall fixed connection of pan feeding hole.

The blanking platform is the round platform structure, and the blanking platform is located the hollow portion of blanking baffle, blanking platform and agitator coaxial line, and the one end of blanking platform minor diameter is up, and the upper end of blanking platform is equipped with second disc motor, the output shaft of second disc motor is vertical upwards, and the top of second disc motor is equipped with the third and stirs the leaf, the downside and the blanking bench side of third stirring leaf offset, and the third stirs the leaf and the output shaft fixed connection of second disc motor, and the second disc motor is connected with the signal output part of controller.

The connecting rods are multiple, the connecting rods are horizontally located between the blanking table and the blanking baffle and close to the lower end, the connecting rods are evenly distributed on the circumference of the axis of the stirring barrel, and the two ends of each connecting rod are fixedly connected with the blanking table and the blanking baffle respectively.

Through setting up blanking dispersion structure, when the material loading structure is to the agitator blanking, carbon source in the storage box loops through blanking hole and round hole and falls to the up end of blanking platform, second disc motor drives the rotation of third stirring leaf, make the even departure of carbon source towards the circumferencial direction of blanking platform up end, under the effect of blockking of blanking baffle, the carbon source is in the landing downwards to the agitator along the outside face of blanking platform, make the carbon source fall in the agitator becomes the circumference dispersion, avoid a large amount of carbon sources to fall into the agitator in piles, thereby shorten the time that the stirring was mixed, improve the allotment speed of allotment structure.

Preferably, the position level that is close to the upper end in the agitator is equipped with first ring pipe, one side and agitator inner wall fixed connection of agitator axis are kept away from to first ring pipe, and the downside of first ring pipe is equipped with a plurality of holes that leak towards the agitator inner wall, the inlet tube is located inside one end and the first ring pipe intercommunication of agitator.

By arranging the first annular pipe, water flow enters the first annular pipe through the water inlet pipe and then enters the stirring barrel through a plurality of water leakage holes on the lower side surface of the first annular pipe, a circle of water curtain is formed on the inner wall of the stirring barrel during water inlet, and the carbon source is contacted with the water curtain when dispersed and dropped on the inner circumference of the stirring barrel in cooperation with the blanking dispersion structure, so that the mixing of the carbon source and the water is accelerated; simultaneously conveniently wash the region of first baffle top in the agitator.

Preferably, the below level of second baffle is equipped with the second ring tube in the agitator, one side and agitator inner wall fixed connection that the agitator axis was kept away from to the second ring tube, the downside of second ring tube is equipped with a plurality of holes that leak towards the agitator inner wall, the conduction pipe is located the one end and the second ring tube intercommunication of second baffle downside.

The below of agitator still is equipped with the waste pipe, inside the one end of waste pipe passed agitator downside to agitator, the other end and the external drainage pipe network intercommunication of waste pipe, the position that the waste pipe is close to the agitator was equipped with the waste water valve, the waste water valve with the signal output part of controller be connected.

Through setting up the second ring pipe, waste pipe and waste water valve, the convenient agitator that washs of the first ring pipe of cooperation, when needs wash the agitator, only need open the water intaking valve simultaneously, conduction valve and waste water valve, water spouts to the agitator inner wall from the hole that leaks of first ring pipe, thereby wash the agitator inner wall, then the water of second baffle top also washes the agitator inner wall through conduction pipe and the ring pipe of second, the waste water that washes at last is discharged through the waste water pipe.

In order to solve the second technical problem, the invention adopts the following technical scheme: a carbon source adding method based on a biochemical treatment process uses the carbon source adding device based on the biochemical treatment process, and comprises the following steps.

S1: one or more carbon source feeding points are arranged in the biochemical treatment area, and one end of the water outlet pipe, which is far away from the stirring barrel, is arranged at the carbon source feeding point.

S2: the interval time of every two times of detection of the detection structure is set through the processor, the second flowmeter measures the water inlet volume of the sewage treatment plant in unit time during every detection, the TN online automatic monitor measures the water inlet TN value of the sewage treatment plant, and the COD online automatic monitor measures the water inlet COD value of the sewage treatment plant.

S3: and the processor calculates the weight value of the carbon source to be added in the interval time according to the water inlet volume, the water inlet TN value, the water inlet COD value, the discharge standard TN value and the discharge standard COD value in unit time.

S4: and the processor controls the blending structure through the controller to blend the carbon source, and the carbon source with the weight value calculated in the step S4 and water are stirred and mixed according to a certain weight ratio to obtain a carbon source aqueous solution.

S5: and the processor controls the opening of the conducting valve through the controller, transfers the carbon source aqueous solution to a region below a second partition plate in the stirring barrel, finally opens the water outlet valve, and continuously conveys the carbon source aqueous solution to a carbon source feeding point at a stable flow rate by the variable pump to finish the feeding of the carbon source within the interval time.

The adding method of the invention uses the carbon source adding device to realize automatic adding of the carbon source, greatly reduces the labor intensity, and simultaneously allocates the carbon source water solution in the interval time period according to the data measured by the second flow meter, the TN online automatic monitor and the COD online automatic monitor, so that the adding amount of the carbon source is more frequent along with the change of the inflow flow, the inflow TN value and the inflow COD value, the adding of the carbon source is more in line with the demand, and the problems of low utilization rate of the carbon source and serious waste are effectively solved.

Preferably, the carbon source in S3 is glucose. The carbon source adding device realizes continuous adding of the carbon source through a carbon source water solution, methanol and ethanol are alcohols, the solubility in water is not ideal, the balance of pH value in sewage treatment can be influenced by adding a large amount of acetic acid, the glucose is low in price and high in solubility in water, and other influences on sewage treatment cannot be caused.

Preferably, the weight ratio of the carbon source to the water in the step S5 is 1:2, and the formula for calculating the weight value of the carbon source to be added in the interval time in the step S4 is as follows:

Ct=Q×Cm （2-1）

Q=q×t （2-2）

Cm=20N-C （2-3）

N=Ne-Ns （2-4）

C=Ce-Cs （2-5）

the method comprises the following steps of obtaining a carbon source, Ct, Cm, Q, N and Ne, wherein Ct is a weight value of the carbon source needing to be added in interval time t, Q is a water inlet volume of the sewage treatment plant in interval time t, T is interval time of every two detections, 20 is a CN fixed ratio, N is a TN difference value of inlet and outlet water of the sewage treatment plant, C is a COD difference value of the inlet and outlet water of the sewage treatment plant, Ne is an inlet water TN value of the sewage treatment plant, Ns is a discharge standard TN value, Ce is an inlet water COD value of the sewage treatment plant, and Cs is a discharge standard COD value.

Because the carbon source selected by the scheme is glucose, 110g of glucose can be dissolved by 100g of water at normal temperature and normal pressure, the weight ratio is about 1:1, the weight ratio of the carbon source to the water in the step S5 is limited to 1:2, the specific gravity of the water is high, the glucose can be dissolved more quickly, and the problem that the glucose cannot be dissolved completely due to temperature change can be effectively solved; the formula for calculating the weight value of the carbon source to be added is suitable for a common activated sludge method, and the weight value of the carbon source to be added can be quickly calculated through the formula group.

Preferably, when the carbon source adding method is applied to the A2O method, a carbon source adding point is arranged at the water inlet end of the anoxic treatment area in the biochemical treatment area in the step S1.

When the carbon source adding method is applied to the A2O method, the denitrification effect brought by the carbon source adding point arranged in the anoxic treatment area is the best.

Preferably, when the carbon source adding method is applied to the AO method, carbon source adding points are respectively arranged at the water inlet ends of the anoxic treatment area and the anaerobic treatment area in the biochemical treatment area in the step S1.

When the carbon source adding method is applied to the AO method, the denitrification effect brought by the simultaneous carbon source adding of the anoxic treatment area and the anaerobic treatment area is the best.

Compared with the prior art, the invention has at least the following advantages:

1. according to the adding device, the water inlet volume, the water inlet TN value and the water inlet COD value of a sewage treatment plant in unit time are obtained through a detection structure, and the control system calculates the weight value of a carbon source to be added in the interval time between two detections of the detection structure through the water inlet volume, the water inlet TN value, the water inlet COD value, the emission standard TN value and the emission standard COD value in unit time; the control system controls the allocation structure to act to allocate the carbon source, the feeding structure drops the carbon source with the required weight to the stirring barrel within the interval time through the weighing function of the weighing sensor, simultaneously, the water inlet valve, the first flow meter and the stirring motor are opened, water and the carbon source are mixed and stirred while water is added into the stirring barrel to obtain a carbon source water solution, the first flow meter is used for feeding back the amount of the injected water, then the conducting valve is opened, the carbon source aqueous solution enters a region below a second partition plate in the stirring barrel through the conducting pipe, finally the water outlet valve and the variable pump are started, the carbon source aqueous solution is conveyed to a carbon source feeding point at a stable flow rate through the water outlet pipe to finish the carbon source feeding within the interval time, because the carbon source is allocated by the allocation structure for a certain time, the control system controls the allocation structure to allocate the carbon source in the next interval time period according to the latest data measured by the detection structure before the carbon source is added in the current interval time period. The continuous automatic adding of the carbon source is realized by reciprocating in this way, so that the labor intensity is greatly reduced, and meanwhile, the carbon source aqueous solution in the interval time period is prepared according to the data measured by the second flow meter, the TN online automatic monitor and the COD online automatic monitor, so that the adding amount of the carbon source is more frequent along with the change of the water inlet flow, the water inlet TN value and the water inlet COD value, the adding amount of the carbon source is more in line with the requirement, and the problem of serious waste of the carbon source is effectively solved.

2. According to the feeding device, the blanking dispersion structure is arranged, when the feeding structure discharges materials to the stirring barrel, the carbon source in the storage box sequentially passes through the blanking hole and the round hole and falls on the upper end face of the blanking table, the second disc motor drives the third stirring blade to rotate, so that the carbon source on the upper end face of the blanking table uniformly flies out in the circumferential direction, and under the blocking effect of the blanking baffle plate, the carbon source slides downwards into the stirring barrel along the outer side face of the blanking table, so that the carbon source falls in the stirring barrel in a circumferentially dispersed manner, and a large amount of carbon source is prevented from falling into the stirring barrel in a stacked manner, so that the stirring and mixing time is shortened, and the blending speed of the blending structure is improved.

3. According to the feeding device, the second annular pipe, the waste water pipe and the waste water valve are arranged, the first annular pipe is matched to conveniently clean the stirring barrel, when the stirring barrel needs to be cleaned, only the water inlet valve, the conduction valve and the waste water valve need to be opened simultaneously, water is sprayed out of the water leakage hole of the first annular pipe to the inner wall of the stirring barrel, so that the inner wall of the stirring barrel is washed, then the water above the second partition plate also washes the inner wall of the stirring barrel through the conduction pipe and the second annular pipe, and finally the washed waste water is discharged through the waste water pipe.

4. According to the adding method, the carbon source adding device is used, automatic adding of the carbon source is achieved, the labor intensity is greatly reduced, meanwhile, the carbon source aqueous solution in the interval time period is prepared according to data measured by the second flow meter, the TN online automatic monitor and the COD online automatic monitor, the adding amount of the carbon source is more frequent along with the change of the inflow flow, the inflow TN value and the inflow COD value, the adding of the carbon source is more in line with the requirement, and therefore the problems of low carbon source utilization rate and serious waste are effectively solved; when the method is applied to the A2O method, the carbon source feeding point is arranged in the anoxic treatment area, and when the method is applied to the AO method, the carbon source feeding points are arranged in the anoxic treatment area and the anaerobic treatment area, so that the effect of the carbon source is exerted to the maximum extent, the utilization rate of the carbon source is improved, the waste of the carbon source is avoided, and the denitrification effect on the sewage is ensured.

Drawings

FIG. 1 is a front view of the overall structure of a carbon source adding apparatus according to the present invention.

FIG. 2 is a front sectional view of the overall structure of the carbon source adding apparatus of the present invention.

Fig. 3 is an enlarged schematic view of a portion a of fig. 1.

Fig. 4 is an enlarged schematic view of fig. 2 at B.

Fig. 5 is an enlarged schematic view at C in fig. 2.

FIG. 6 is a perspective view of the overall structure of the carbon source adding apparatus of the present invention.

FIG. 7 is a control connection diagram of a carbon source adding apparatus according to the present invention.

FIG. 8 is a flow chart of the dosing method of the present invention.

FIG. 9 is a graph of the dosing schedule for experiment one.

FIG. 10 is a scatter plot of the results of an experiment.

FIG. 11 is a graph showing the dosing schedule of experiment two.

FIG. 12 is a scatter plot of the results of the second experiment.

FIG. 13 is a graph showing the dosing schedule of experiment three.

FIG. 14 is a scatter plot of the results of the three experiments.

In the figure, 1-a stirring barrel, 2-a water inlet pipe, 3-a water outlet pipe, 4-a first partition plate, 5-a second partition plate, 6-a first stirring blade, 7-a stirring motor, 8-a conduction pipe, 9-a water inlet valve, 10-a first flowmeter, 11-a water outlet valve, 12-a variable pump, 13-a conduction valve, 21-a storage box, 22-a sliding chute plate, 23-a blocking plate, 24-a pushing cylinder, 25-a weighing sensor, 26-a supporting plate, 27-a blanking hole, 28-a round hole, 31-a second flowmeter, 32-an online TN automatic monitor, 33-a processor, 34-a controller, 35-a COD online automatic monitor, 41-a first disc motor, 42-a second stirring blade and 51-a blanking baffle plate, 52-blanking table, 53-connecting rod, 54-second disc motor, 55-third stirring blade, 61-first annular pipe, 62-second annular pipe, 63-waste water pipe, 64-waste water valve, 71-rectangular vent hole.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

For convenience of description, the following descriptive concepts are introduced in the present writing:

in the present invention, 'front', 'rear', 'left', 'right', 'up', 'down' all refer to the orientation in fig. 1, wherein 'front' refers to being out with respect to the paper in fig. 1 and 'rear' refers to being in fig. 1. In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "disposed," "sleeved/connected," "connected," and the like are to be construed broadly, e.g., "connected," which may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Referring to fig. 1-7, one embodiment of the present invention is provided:

example 1: a carbon source adding device based on a biochemical treatment process comprises a blending structure, a detection structure and a control system.

The blending structure comprises a stirring structure and a feeding structure. The stirring structure comprises a stirring barrel 1, a water inlet pipe 2 and a water outlet pipe 3. The stirring barrel 1 is of a cylindrical structure with a cavity, and a first partition plate 4 and a second partition plate 5 are horizontally arranged in the stirring barrel 1 from top to bottom.

The top of first baffle 4 is equipped with first stirring leaf 6 in agitator 1, is equipped with agitator motor 7 between first baffle 4 and the second baffle 5 in the agitator 1, agitator motor 7's the vertical ascending of output shaft, agitator motor 7's output shaft extend to the top of

first baffle

4 and 6 fixed connection of first stirring leaf, vertically be equipped with conduction pipe 8 between first baffle 4 and the second baffle 5 in the agitator 1, conduction pipe 8's upper end extends to the upside of first baffle 4, and conduction pipe 8's lower extreme extends to the downside of second baffle 5, and the position that conduction pipe 8 is located between first baffle 4 and the second baffle 5 is equipped with conduction valve 13.

The side of going up of agitator 1 is equipped with the pan feeding hole, pan feeding hole and 1 coaxial line of agitator, pan feeding hole and 1 inside intercommunication of agitator. The one end of inlet tube 2 passes the side of going up of agitator 1 to agitator 1 inside, and inlet tube 2 and the partial intercommunication of 1 inside first baffle 4 tops of agitator, the other end and the water source intercommunication of inlet tube 2, the position that inlet tube 2 is close to agitator 1 is equipped with water intaking valve 9 and first flowmeter 10, the one end of outlet pipe 3 passes the downside of agitator 1 to agitator 1 inside, and outlet pipe 3 and the partial intercommunication of 1 inside second baffle 5 below of agitator, the position that outlet pipe 3 is close to agitator 1 is equipped with outlet valve 11 and variable pump 12.

The feeding structure comprises a storage box 21, a chute plate 22, a blocking plate 23, a pushing cylinder 24, a weighing sensor 25 and a supporting plate 26. The inside cylindric cavity that is of storage box 21, the side opening on the storage box 21, the bottom in the storage box 21 is equipped with a plurality of blanking holes 27, blanking hole 27 is vertical through-hole.

The supporting plate 26 is horizontally arranged below the storage box 21, the supporting plate 26 is provided with a round hole 28 coaxial with the inner cavity of the storage box 21, the diameter of the round hole 28 is larger than that of the inner cavity of the storage box 21, and the round hole 28 is a vertical through hole. Weighing sensor 25 is four, and four weighing sensor 25 are located the position that is close to storage box 21 four corners between storage box 21 and the backup pad 26 respectively, and weighing sensor 25's sense terminal and storage box 21 downside fixed connection, side fixed connection on weighing sensor 25 and the backup pad 26.

The chute board 22 is two, and two chute boards 22 are along the fixed downside that sets up at storage box 21 of fore-and-aft direction, 23 levels of barrier plate set up between two chute boards 22, and the last side of barrier plate 23 offsets with the region that a plurality of blanking holes 27 of storage box 21 downside correspond, and both ends respectively with corresponding chute board 22 sliding fit about barrier plate 23, and barrier plate 23 can follow the fore-and-aft direction and slide. The push cylinder 24 is fixedly arranged on the support plate 26, the telescopic end of the push cylinder 24 is arranged forwards, and the telescopic end of the push cylinder 24 is fixedly connected with the rear side face of the stop plate 23.

The feeding structure is located above the stirring barrel 1, the supporting plate 26 is fixedly connected with the stirring barrel 1, the diameter of the round hole 28 is smaller than that of the feeding hole, and the round hole 28 and the feeding hole are coaxial.

The detection structure comprises a second flowmeter 31, a TN (twisted nematic) online automatic monitor 32 and a COD (chemical oxygen demand) online automatic monitor 35, wherein the second flowmeter 31 is used for detecting the water inlet volume of a sewage treatment plant in unit time, the TN online automatic monitor 32 is used for detecting the water inlet TN value of the sewage treatment plant, and the COD online automatic monitor 35 is used for detecting the water inlet COD value of the sewage treatment plant.

The control system comprises a processor 33 and a controller 34, wherein the signal input end of the processor 33 is respectively connected with the weighing sensor 25, the first flowmeter 10, the second flowmeter 31, the TN online automatic monitor 32 and the COD online automatic monitor 35, the signal output end of the processor 33 is connected with the signal input end of the controller 34, and the signal output end of the controller 34 is respectively connected with the water inlet valve 9, the water outlet valve 11, the variable pump 12, the conduction valve 13, the stirring motor 7 and the push cylinder 24.

Further, a first disk motor 41 and a second stirring blade 42 are arranged in the storage box 21. The fixed bottom that sets up in storage box 21 of first disc motor 41, the output shaft of first disc motor 41 is vertical upwards, second stirring leaf 42 is located the top of first disc motor 41, and the downside of second stirring leaf 42 offsets with the bottom in the storage box 21, and second stirring leaf 42 and the output shaft fixed connection of first disc motor 41, first disc motor 41 is connected with the signal output part of controller 34.

Further, a blanking dispersing structure is further arranged between the supporting plate 26 and the stirring barrel 1, and the blanking dispersing structure comprises a blanking baffle 51, a blanking table 52 and a connecting rod 53.

Blanking baffle 51 is hollow round platform structure, blanking baffle 51 and agitator 1 coaxial line, and blanking baffle 51 minor diameter's one end is up, blanking baffle 51's upper end and backup pad 26 downside fixed connection, and blanking baffle 51's lower extreme is located the pan feeding downthehole, blanking baffle 51's lateral surface and the pore wall fixed connection of pan feeding hole.

Blanking platform 52 is the round platform structure, and blanking platform 52 is located the hollow portion of blanking baffle 51, blanking platform 52 and agitator 1 coaxial line, and blanking platform 52 minor diameter's one end is up, and blanking platform 52's upper end is equipped with second disc motor 54, the output shaft of second disc motor 54 is vertical upwards, and the top of second disc motor 54 is equipped with third stirring leaf 55, the downside of third stirring leaf 55 offsets with blanking platform 52 side, and third stirring leaf 55 and second disc motor 54's output shaft fixed connection, and second disc motor 54 is connected with controller 34's signal output part.

The connecting rods 53 are multiple, the connecting rods 53 are horizontally located between the blanking table 52 and the blanking baffle 51 and close to the lower end, the connecting rods 53 are evenly distributed on the circumference of the axis of the stirring barrel 1, and two ends of each connecting rod 53 are fixedly connected with the blanking table 52 and the blanking baffle 51 respectively.

Further, be close to the position level of upper end in the agitator 1 and be equipped with first ring conduit 61, one side and 1 inner wall fixed connection of agitator 1 axis are kept away from to first ring conduit 61, and the downside of first ring conduit 61 is equipped with a plurality of holes that leak towards 1 inner wall of agitator, inlet tube 2 is located 1 inside one end of agitator and first ring conduit 61 intercommunication.

Further, the below level of second baffle 5 is equipped with second ring tube 62 in agitator 1, one side and 1 inner wall fixed connection of agitator 1 axis are kept away from to second ring tube 62, and the downside of second ring tube 62 is equipped with a plurality of holes that leak towards 1 inner wall of agitator, conduction pipe 8 is located the one end and the second ring tube 62 intercommunication of second baffle 5 downside.

The lower part of the stirring barrel 1 is also provided with a waste water pipe 63, one end of the waste water pipe 63 penetrates through the lower side surface of the stirring barrel 1 to the inside of the stirring barrel 1, the other end of the waste water pipe 63 is communicated with an external drainage pipe network, a waste water valve 64 is arranged at the position, close to the stirring barrel 1, of the waste water pipe 63, and the waste water valve 64 is connected with a signal output end of the controller 34

In specific implementation, in order to avoid heat accumulation of the stirring motor 7 and ensure normal operation of the stirring motor 7, the outer circular surface of the stirring barrel 1 is provided with a plurality of ventilation units, each ventilation unit comprises a plurality of rectangular ventilation holes 71, and the rectangular ventilation holes 71 are located between the first partition plate 4 and the second partition plate 5.

The working principle of the carbon source adding device based on the biochemical treatment process defined by the invention is as follows:

a preparation stage: leading one end of the water outlet pipe 3, which is far away from the stirring barrel 1, to a carbon source feeding point, and adding sufficient carbon source into the storage box 21;

a detection stage: in the detection structure, the second flowmeter 31 measures the water inlet volume of a sewage treatment plant in unit time, the TN value of the inlet water of the sewage treatment plant measured by the TN online automatic monitor 32, the COD value of the inlet water of the sewage treatment plant measured by the COD online automatic monitor 35, the detection structure transmits the data to the processor 33, and the processor 33 calculates the weight value of the added carbon source required in the interval time of the two detections of the detection structure according to the water inlet volume, the TN value of the inlet water, the COD value of the inlet water, the TN value of the emission standard and the COD value of the emission standard in unit time.

And (3) carbon source blending stage: the processor 33 controls the blending structure to blend the carbon source through the controller 34, the telescopic end of the push cylinder 24 contracts to drive the blocking plate 23 to move backwards, so that the blocking plate 23 does not block a plurality of blanking holes 27 of the storage box 21 any more, the first disc motor 41 drives the second stirring blade 42 to rotate, thereby breaking the stable state of the carbon source in the storage box 21, the carbon source rapidly falls through the blanking holes 27, the processor 33 calculates the difference between the sum of the weight values measured by all the weighing sensors 25 in real time and the initial weight value, and when the weight difference value reaches the calculated weight value of the required carbon source, the telescopic end of the push cylinder 24 extends out to drive the blocking 23 plate to block the blanking holes 27 again;

the carbon source passes through the blanking hole 27 and then falls onto the upper end face of the blanking table 52 through the circular hole 28 of the supporting plate 26, the second disc motor 54 drives the third stirring blade 55 to rotate, so that the carbon source on the upper end face of the blanking table 52 flies out in the circumferential direction, the flown carbon source falls into the space between the blanking table 52 and the blanking baffle 51 under the blocking effect of the blanking baffle 51, then the carbon source slides downwards along the side face of the blanking table 52, the carbon source enters the stirring barrel 1 through the feeding hole on the upper side face of the stirring barrel 1, and the carbon source falls in the stirring barrel 1 in a circumferentially dispersed state;

simultaneously, the water inlet valve 9 is opened, the first flow meter 10 measures the volume of water entering the stirring barrel 1, the water enters the first annular pipe 61 through the water inlet pipe 2, then the water is sprayed out from a plurality of water leakage holes of the first annular pipe 61, a circle of water curtain is formed on the inner wall of the stirring barrel 1, the carbon source contacts with the water curtain in the falling process and quickly falls to the first partition plate 4 along with the water flow, the stirring motor 7 drives the first stirring blade 6 to rotate, and the carbon source and the water are fully mixed according to a certain weight ratio to obtain a carbon source aqueous solution;

then, the conduction valve 13 is opened, the carbon source aqueous solution enters the region below the second partition plate 5 in the stirring barrel 1 through the conduction pipe 8 and the second annular pipe 62, and after the carbon source aqueous solution above the first partition plate 4 completely flows into the region below the second partition plate 5 in the stirring barrel 1, the conduction valve 13 is closed.

And (3) adding stage: the water outlet valve 11 and the variable pump 12 are started, the carbon source aqueous solution is conveyed to the carbon source feeding point through the water outlet pipe 3 at a stable flow rate, and after the carbon source aqueous solution is completely discharged, the carbon source feeding within the interval time is completed.

And (3) circulation: since the carbon source needs a certain time for blending, in the adding stage, before the carbon source aqueous solution prepared in the previous time is not completely emptied, the processor 33 calculates the amount of the carbon source to be added in the next interval time by using a new set of data measured by the detection structure of the processor 33, and then the processor 33 controls the blending structure to perform a new round of carbon source blending through the controller 34, thereby realizing the uninterrupted adding of the carbon source.

The processor 33 adjusts the output flow rate of the variable pump 12 according to the water inlet volume of the water inlet pipe 2 each time, so that the carbon source aqueous solution prepared each time is exactly and completely delivered to the carbon source adding point in the interval time, and the effect of reasonably adding the carbon source is achieved. The calculation process used was the volume of the incoming water divided by the interval time to obtain the output flow of the variable displacement pump.

Referring to fig. 1-8, one embodiment of the present invention is provided:

example 2: a carbon source adding method based on a biochemical treatment process uses the carbon source adding device based on the biochemical treatment process in the embodiment 1, and comprises the following steps.

S1: one or more carbon source feeding points are arranged in the biochemical treatment area, and one end of the water outlet pipe 3 far away from the stirring barrel 1 is arranged at the carbon source feeding point.

S2: the interval time of every two times of detection of the detection structure is set through the processor 33, the water inlet volume of the sewage treatment plant in unit time is measured by the second flowmeter 31 during every detection, the water inlet TN value of the sewage treatment plant is measured by the TN online automatic monitor 32, and the water inlet COD value of the sewage treatment plant is measured by the COD online automatic monitor 35.

S3: the processor 33 calculates the weight value of the carbon source to be added in the interval time according to the water inlet volume, the water inlet TN value, the water inlet COD value, the discharge standard TN value and the discharge standard COD value in unit time.

S4: the processor 33 controls the blending structure to blend the carbon source through the controller 34, and mixes the carbon source with the water in a certain weight ratio to obtain the carbon source aqueous solution, wherein the weight value is calculated in the step S4.

S5: the processor 33 controls the conduction valve 13 to open through the controller 34, transfers the carbon source aqueous solution to the area below the second partition plate 5 in the stirring barrel 1, finally opens the water outlet valve 13, and the variable pump 12 continuously conveys the carbon source aqueous solution to the carbon source feeding point at a stable flow rate, thereby completing the carbon source feeding within the interval time.

Further, the carbon source in S3 is glucose.

Further, the weight ratio of the carbon source to the water in the step S5 is 1:2, and the formula for calculating the weight value of the carbon source to be added in the interval time in the step S4 is as follows:

Ct=Q×Cm （3-1）

Q=q×t （3-2）

Cm=20N-C （3-3）

N=Ne-Ns （3-4）

C=Ce-Cs （3-5）

In specific implementation, the discharge standard TN value and the discharge standard COD value are standard data set by the state for the discharge water of the sewage treatment plant, in the formula (3-4), the N-source refers to the TKN difference value of the inlet water, the Ne refers to the inlet water TKN value, and the Ns is the discharge standard TKN value.

In specific implementation, the above formula takes COD as a standard for the calculation of the weight of the carbon source, glucose is selected as the carbon source in the scheme, 1g of glucose is equivalent to 1.0667g of COD, and the ratio of the two is close to 1:1, so that the weight value of the carbon source obtained by calculation is directly used as the weight value of the glucose in the scheme, and the carbon source is further blended to obtain a carbon source aqueous solution, and errors generated by the carbon source aqueous solution can be ignored under the condition that a large amount of waste exists in the original carbon source.

In practical implementation, since the volume of 1g of water is about 1ml, the volume and the weight of water are equal in value, the first flow meter 10 measures the volume of water entering the stirring barrel 1 from the moment when the water inlet valve 9 is opened, transmits volume data to the processor 33, and when the volume value of water reaches twice the weight value of the required carbon source, the water inlet valve 9 is closed.

In specific implementation, in order to continuously deliver the carbon source aqueous solution to the carbon source feeding point, when the carbon source aqueous solution is delivered, the processor 33 adjusts the output flow rate of the variable pump 12 through the controller 34, wherein the calculation process is to divide the volume of water added into the stirring barrel 1 by the interval time to obtain the output flow rate of the variable pump 12.

Further, when the carbon source adding method is applied to the A2O method, a carbon source adding point is arranged at the water inlet end of the anoxic treatment area in the biochemical treatment area in the step S1.

Further, when the carbon source adding method is applied to the AO method, carbon source adding points are respectively arranged at the water inlet ends of the anoxic treatment area and the anaerobic treatment area in the biochemical treatment area in the step S1.

The process of the adding method based on the biochemical treatment process defined by the invention is as follows:

firstly, one or more carbon source feeding points are arranged in a biochemical treatment area, when the method is applied to an A2O method, the carbon source feeding point is arranged in an anoxic treatment area to bring the best denitrification effect, and when the method is applied to an AO method, the anoxic treatment area and the anaerobic treatment area simultaneously carry out carbon source feeding to bring the best denitrification effect.

And then, one end of the water outlet pipe 3, which is far away from the stirring barrel 1, is arranged at a carbon source feeding point. And starting a carbon source adding device, and adding sufficient carbon sources into the storage box 21. Then the second flowmeter 31 measures the water inlet volume of the sewage treatment plant in unit time, the TN online automatic monitor 32 measures the water inlet TN value of the sewage treatment plant, and the COD online automatic monitor 35 measures the water inlet COD value of the sewage treatment plant. The weight value of the carbon source to be added in the interval time is calculated by the processor 33 according to the water inlet volume, the water inlet TN value, the water inlet COD value, the discharge standard TN value and the discharge standard COD value in unit time, and then the processor 33 controls the blending structure through the controller 34 to stir and mix the carbon source and the water to obtain the carbon source aqueous solution.

And finally, continuously conveying the carbon source aqueous solution to a carbon source adding point by using a carbon source adding device, and finishing adding the carbon source in a unit time period.

Experimental analysis for carbon source addition point selection:

the experiments for confirming the optimum installation position of the carbon source addition point in the AO method and the A2O method were carried out in a sewage treatment plant having two sets of treatment facilities, one set of which was the AO method (modified from the obel oxidation ditch) and the other set of which was the A2O method.

Carbon source feeding points are respectively arranged in an anaerobic treatment area and an anoxic treatment area of the two sets of treatment facilities, experiments are carried out in stages, and the optimal setting position of the carbon source feeding points is analyzed according to the TN value after sewage treatment.

Experiment one:

the adding scheme comprises the following steps: the A2O method comprises three stages, the first stage only adds carbon source in anaerobic treatment area, the second stage only adds carbon in anoxic treatment areaA source, a carbon source is added into the anaerobic treatment area and the anoxic treatment area at the same time in the third stage, each stage is carried out for a week, and the unit consumption of the carbon source in each stage is maintained at 15kg/km³Left and right as shown in fig. 9.

The experimental results are as follows: the TN removal rate of the carbon source added in the different treatment areas of A2O and the actually calculated unit consumption of the carbon source are shown in FIG. 10, and it can be seen from the graph that the unit consumption of the carbon source is maintained at 15kg/km³When the total-nutrient-free anaerobic treatment agent is added in an anaerobic treatment area, the TN removal rate reaches 77.65% at the maximum, the average value is 71.40%, when the total-nutrient-free anaerobic treatment agent is added in an anoxic treatment area, the TN removal rate reaches 79.67% at the maximum, the average value is 74.36%, when the anoxic treatment area and the anaerobic treatment area are added simultaneously, the average value of the removal rate is 66.88%, and the removal rate is obviously lower than that when the total-nutrient-free anaerobic treatment agent is added in two.

And (4) analyzing results: according to the experimental result, the adding in the anoxic treatment area of A2O is more efficient, the dissolved oxygen is kept to be stable at a lower level, and the adding in the anoxic treatment area can further reduce the consumption of carbon sources. In addition, the removal rate of the total nitrogen has the rule that the removal rate of the total nitrogen rises along with the extension of the stable adding time and the removal rate of the total nitrogen suddenly drops along with the switching of the adding point, so that the continuous adding of the carbon source is paid attention to when the carbon source is added.

Experiment two:

the adding scheme comprises the following steps: a0 is divided into three stages, the first stage only adds carbon source in anaerobic treatment area, the second stage only adds carbon source in anoxic treatment area, the third stage adds carbon source in anaerobic treatment area and anoxic treatment area simultaneously, each stage is carried out for one week, the unit consumption of carbon source in each stage is maintained at 30kg/km³Left and right as shown in fig. 11.

Results of experiment 2: the TN removal rate of carbon source added in different AO treatment zones and the actually calculated carbon source consumption are shown in FIG. 12, and it can be seen from the graph that the carbon source consumption is maintained at 30kg/km³And when the addition is carried out in the anaerobic treatment area, the TN removal rate reaches 74.12% at the maximum, the average value is 66.74%, the addition is carried out in the anoxic treatment area, the TN removal rate reaches 73.91% at the maximum, the average value is 69.81%, the addition is carried out in the anoxic treatment area and the anaerobic treatment area simultaneously, the TN removal rate reaches 74.83% at the maximum, and the average value is 72.95%, as shown in figure 12.

And (4) analyzing results: from FIG. 12, three can be seenIn each adding stage, the unit consumption of the carbon source is maintained at 30kg/km³On the left and right sides, a higher TN removal rate can be obtained when the anoxic treatment region and the anaerobic treatment region are simultaneously added.

Summary of the experiments:

according to the above experiments, in order to ensure more efficient TN removal of effluent, it was optimized to set the carbon source addition point in the anoxic treatment zone in the A2O process, and to set the carbon source addition point in both the anoxic treatment zone and the anaerobic treatment zone in the AO process.

Experimental analysis on carbon source addition amount:

for the current test of large waste of carbon source caused by excessive carbon source addition, adding points are set in an anoxic treatment area and an anaerobic treatment area of a treatment facility using an AO method, the test is carried out in stages, and whether the carbon source addition is excessive is judged according to the change condition of the TN removal rate.

Experiment three:

the adding scheme comprises the following steps: the anoxic treatment area and the anaerobic treatment area are added simultaneously, the adding amount of the carbon source is changed, the adding is divided into three stages, and the unit consumption of the carbon source is respectively set to be about 32mg/L, 15mg/L and 7.5mg/L, as shown in figure 13.

And (3) test results: when the unit consumption of the carbon source is about 32mg/L, the average value of the removal rate of the total nitrogen is 71.74%. When the unit consumption of the carbon source is about 15mg/L, the average value of the removal rate of the total nitrogen is 74.44%. The average value of the total nitrogen removal rate was 74.27% when the unit consumption of carbon source was about 7.5mg/L, as shown in FIG. 14.

And (4) analyzing results: it can be seen that under the test conditions, the TN removal rate and the unit consumption of carbon source addition do not have a linear relationship, when the unit consumption of addition is reduced from 15mg/L to 7.5mg/L, the total nitrogen removal rate is not obviously reduced, which indicates that when the unit consumption is more than 7.5mg/L, the waste of carbon source addition exists, but when the unit consumption of addition is about 15mg/L, the TN removal rate fluctuation is minimum.

The carbon source amount required to be added in the day is calculated according to the sewage flow, the intake TN value and the intake COD value in the previous day, and the carbon source is added in a manual mode, so that the problem that the total nitrogen removal rate is insufficient due to insufficient carbon source addition caused by large fluctuation of the sewage flow, the intake TN value and the intake COD value, and the drainage cannot reach the discharge standard is solved, so that the unit consumption of the carbon source is generally set to be 7.5-32 mg/L when the carbon source is manually added at present, and the carbon source adding is seriously wasted through the experiment. After the adding method is used, the unit consumption of the carbon source is mostly 7.5-15 mg/L, and the amount of the carbon source added by using the method is approximate to the amount of the carbon source required for enabling the discharged sewage to reach the standard, so that the waste of a large amount of the carbon source is avoided.

Finally, the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting, although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all of them should be covered in the claims of the present invention.

Claims

1. A carbon source feeding device based on biochemical treatment process is characterized in that: comprises a deployment structure, a detection structure and a control system;

the blending structure comprises a stirring structure and a feeding structure; the stirring structure comprises a stirring barrel (1), a water inlet pipe (2) and a water outlet pipe (3); the stirring barrel (1) is of a cylindrical structure with a cavity, and a first partition plate (4) and a second partition plate (5) are horizontally arranged in the stirring barrel (1) from top to bottom;

a first stirring blade (6) is arranged above a first partition plate (4) in the stirring barrel (1), a stirring motor (7) is arranged between the first partition plate (4) and a second partition plate (5) in the stirring barrel (1), an output shaft of the stirring motor (7) is vertically upward, the output shaft of the stirring motor (7) extends to the upper side of the first partition plate (4) and is fixedly connected with the first stirring blade (6), a conduction pipe (8) is vertically arranged between the first partition plate (4) and the second partition plate (5) in the stirring barrel (1), the upper end of the conduction pipe (8) extends to the upper side of the first partition plate (4), the lower end of the conduction pipe (8) extends to the lower side of the second partition plate (5), and a conduction valve (13) is arranged at a position, between the first partition plate (4) and the second partition plate (5), of the conduction pipe (8);

the upper side surface of the stirring barrel (1) is provided with a feeding hole, the feeding hole and the stirring barrel (1) are coaxial, and the feeding hole is communicated with the inside of the stirring barrel (1); one end of the water inlet pipe (2) penetrates through the upper side face of the stirring barrel (1) to the inside of the stirring barrel (1), the water inlet pipe (2) is communicated with the part above a first partition plate (4) in the stirring barrel (1), the other end of the water inlet pipe (2) is communicated with a water source, a water inlet valve (9) and a first flowmeter (10) are arranged at the position, close to the stirring barrel (1), of the water inlet pipe (2), one end of the water outlet pipe (3) penetrates through the lower side face of the stirring barrel (1) to the inside of the stirring barrel (1), the water outlet pipe (3) is communicated with the part below a second partition plate (5) in the stirring barrel (1), and a water outlet valve (11) and a variable pump (12) are arranged at the position, close to the stirring barrel;

the feeding structure comprises a storage box (21), a chute plate (22), a blocking plate (23), a pushing cylinder (24), a weighing sensor (25) and a supporting plate (26); the storage box (21) is internally provided with a cylindrical cavity, the upper side surface of the storage box (21) is open, a plurality of blanking holes (27) are formed in the bottom of the storage box (21), and the blanking holes (27) are vertical through holes;

the supporting plate (26) is horizontally arranged below the storage box (21), the supporting plate (26) is provided with a round hole (28) coaxial with the inner cavity of the storage box (21), the diameter of the round hole (28) is larger than that of the inner cavity of the storage box (21), and the round hole (28) is a vertical through hole; the number of the weighing sensors (25) is four, the four weighing sensors (25) are respectively positioned between the storage box (21) and the supporting plate (26) and are close to the four corners of the storage box (21), the detection end of each weighing sensor (25) is fixedly connected with the lower side surface of the storage box (21), and the weighing sensors (25) are fixedly connected with the upper side surface of the supporting plate (26);

the two sliding groove plates (22) are fixedly arranged on the lower side surface of the storage box (21) along the front-back direction, the blocking plate (23) is horizontally arranged between the two sliding groove plates (22), the upper side surface of the blocking plate (23) is abutted against corresponding areas of a plurality of blanking holes (27) on the lower side surface of the storage box (21), the left end and the right end of the blocking plate (23) are respectively in sliding fit with the corresponding sliding groove plates (22), and the blocking plate (23) can slide along the front-back direction; the push cylinder (24) is fixedly arranged on the support plate (26), the telescopic end of the push cylinder (24) is arranged forwards, and the telescopic end of the push cylinder (24) is fixedly connected with the rear side face of the blocking plate (23);

the feeding structure is positioned above the stirring barrel (1), the supporting plate (26) is fixedly connected with the stirring barrel (1), the diameter of the circular hole (28) is smaller than that of the feeding hole, and the circular hole (28) and the feeding hole are coaxial;

the detection structure comprises a second flowmeter (31), a TN (TN) online automatic monitor (32) and a COD (chemical oxygen demand) online automatic monitor (35), wherein the second flowmeter (31) is used for detecting the water inlet volume of the sewage treatment plant in unit time, the TN online automatic monitor (32) is used for detecting the water inlet TN value of the sewage treatment plant, and the COD online automatic monitor (35) is used for detecting the water inlet COD value of the sewage treatment plant;

the control system comprises a processor (33) and a controller (34), wherein a signal input end of the processor (33) is respectively connected with a weighing sensor (25), a first flowmeter (10), a second flowmeter (31), a TN (TN) online automatic monitor (32) and a COD online automatic monitor (35), a signal output end of the processor (33) is connected with a signal input end of the controller (34), and a signal output end of the controller (34) is respectively connected with a water inlet valve (9), a water outlet valve (11), a variable pump (12), a conduction valve (13), a stirring motor (7) and a push cylinder (24).

2. The carbon source adding device based on the biochemical treatment process as claimed in claim 1, wherein: a first disc motor (41) and a second stirring blade (42) are also arranged in the storage box (21); the fixed bottom that sets up in storage box (21) of first disc motor (41), the output shaft of first disc motor (41) is vertical upwards, second stirring leaf (42) are located the top of first disc motor (41), and the downside of second stirring leaf (42) offsets with the bottom in storage box (21), and output shaft fixed connection of second stirring leaf (42) and first disc motor (41), first disc motor (41) are connected with the signal output part of controller (34).

3. The carbon source adding device based on the biochemical treatment process as claimed in claim 2, wherein: a blanking dispersion structure is also arranged between the supporting plate (26) and the stirring barrel (1), and the blanking dispersion structure comprises a blanking baffle (51), a blanking table (52) and a connecting rod (53);

the blanking baffle (51) is of a hollow circular truncated cone structure, the blanking baffle (51) and the stirring barrel (1) are coaxial, one end of the blanking baffle (51) with the small diameter faces upwards, the upper end of the blanking baffle (51) is fixedly connected with the lower side face of the supporting plate (26), the lower end of the blanking baffle (51) is located in the feeding hole, and the outer side face of the blanking baffle (51) is fixedly connected with the hole wall of the feeding hole;

the blanking table (52) is of a circular truncated cone structure, the blanking table (52) is located in the hollow part of the blanking baffle (51), the blanking table (52) and the stirring barrel (1) are coaxial, one end of the blanking table (52) with the small diameter faces upwards, a second disc motor (54) is arranged at the upper end of the blanking table (52), an output shaft of the second disc motor (54) is vertically upwards, a third stirring blade (55) is arranged above the second disc motor (54), the lower side surface of the third stirring blade (55) is abutted to the upper side surface of the blanking table (52), the third stirring blade (55) is fixedly connected with the output shaft of the second disc motor (54), and the second disc motor (54) is connected with a signal output end of the controller (34);

connecting rod (53) are a plurality of, and connecting rod (53) level is located and is close to the position of lower extreme between blanking platform (52) and blanking baffle (51), and a plurality of connecting rods (53) are with agitator (1) axis circumference evenly distributed, the both ends of connecting rod (53) respectively with blanking platform (52) and blanking baffle (51) fixed connection.

4. The carbon source adding device based on the biochemical treatment process, as recited in claim 3, wherein: be close to the position level of upper end in agitator (1) and be equipped with first looped pipeline (61), one side and agitator (1) inner wall fixed connection of agitator (1) axis are kept away from in first looped pipeline (61), and the downside of first looped pipeline (61) is equipped with a plurality of holes that leak towards agitator (1) inner wall, inlet tube (2) are located agitator (1) inside one end and first looped pipeline (61) intercommunication.

5. The carbon source adding device based on the biochemical treatment process as claimed in claim 4, wherein: a second annular pipe (62) is horizontally arranged below the second partition plate (5), one side, far away from the axis of the stirring barrel (1), of the second annular pipe (62) is fixedly connected with the inner wall of the stirring barrel (1), a plurality of water leakage holes facing the inner wall of the stirring barrel (1) are formed in the lower side surface of the second annular pipe (62), and one end, located on the lower side of the second partition plate (5), of the conducting pipe (8) is communicated with the second annular pipe (62);

the utility model discloses a water mixing device, including agitator (1), the below of agitator (1) still is equipped with waste water pipe (63), inside waste water pipe (63) passed agitator (1) downside to agitator (1) one end of waste water pipe (63), the other end and the external drain pipe network intercommunication of waste water pipe (63), waste water pipe (63) are close to the position of agitator (1) and are equipped with waste water valve (64), waste water valve (64) with be connected with the signal output part of controller (34).

6. A carbon source adding method based on a biochemical treatment process is characterized by comprising the following steps: the carbon source adding device based on the biochemical treatment process, which is disclosed by the claim 5, comprises the following steps;

s1: one or more carbon source feeding points are arranged in the biochemical treatment area, and one end of the water outlet pipe (3) far away from the stirring barrel (1) is arranged at the carbon source feeding point;

s2: setting the interval time of every two times of detection of the detection structure through a processor (33), measuring the water inlet volume of a sewage treatment plant in unit time by a second flowmeter (31) during each detection, measuring the water inlet TN value of the sewage treatment plant by a TN online automatic monitor (32), and measuring the water inlet COD value of the sewage treatment plant by a COD online automatic monitor (35);

s3: the processor (33) calculates the weight value of the carbon source to be added in the interval time according to the water inlet volume, the water inlet TN value, the water inlet COD value, the discharge standard TN value and the discharge standard COD value in unit time;

s4: the processor (33) controls the blending structure to blend the carbon source through the controller (34), and the carbon source with the weight value calculated in the step S4 and water are stirred and mixed according to a certain weight ratio to obtain a carbon source aqueous solution;

s5: the processor (33) controls the conduction valve (13) to be opened through the controller (34), the carbon source aqueous solution is transferred to the area below the second partition plate (5) in the stirring barrel (1), finally the water outlet valve (13) is opened, the variable pump (12) continuously conveys the carbon source aqueous solution to a carbon source feeding point at a stable flow rate, and the carbon source feeding within the interval time is completed.

7. The method for adding the carbon source based on the biochemical treatment process, as recited in claim 6, wherein: the carbon source in S3 is glucose.

8. The method for adding the carbon source based on the biochemical treatment process, as recited in claim 7, wherein: the weight ratio of the carbon source to the water in the step S5 is 1:2, and the formula for calculating the weight value of the carbon source to be added in the interval time in the step S4 is as follows:

Ct=Q×Cm（1-1）

Q=q×t （1-2）

Cm=20N-C （1-3）

N=Ne-Ns （1-4）

C=Ce-Cs （1-5）

9. The method for adding the carbon source based on the biochemical treatment process, as recited in claim 7, wherein: when the carbon source adding method is applied to the A2O method, a carbon source adding point is arranged at the water inlet end of an anoxic treatment area in the biochemical treatment area in the step S1.

10. The method for adding the carbon source based on the biochemical treatment process, as recited in claim 7, wherein: when the carbon source adding method is applied to the AO method, carbon source adding points are respectively arranged at the water inlet ends of the anoxic treatment area and the anaerobic treatment area in the biochemical treatment area in the step S1.