Preparation method of composite carbon source

Abstract

The invention discloses a preparation method of a composite carbon source. The preparation method comprises the following steps: step 1, pretreating wastewater; carrying out filtration, precipitation and pH regulation treatment on the wastewater; 2, pumping the wastewater pretreated in the step 1 and methanol into a mixing tank; mixing the wastewater and methanol by adopting a mixing tank through mechanical stirring to obtain a mixture; step 3, adding a surfactant and a growth factor into the mixture in the step 2, and continuously mixing to obtain a composite carbon source; and 4, testing the density, the viscosity and the PH value of the mixed solution obtained in the step 3, and then conveying the mixed solution into a storage tank for storage. The preparation method of the composite carbon source provided by the invention is simple to operate, convenient to prepare and convenient for mass production and utilization.

Description

Technical Field

[0001] The invention relates to the technical field of sewage treatment, and in particular to a method for preparing a composite carbon source. Background Art

[0002] With the development of economy and society, eutrophication of water bodies is becoming more and more serious, and the nitrogen and phosphorus content in water bodies is increasing. Efficient and stable nitrogen and phosphorus removal is the key link in sewage treatment, and biological denitrification using the metabolism of microorganisms is the most economical and effective. The carbon source cost of biological denitrification of sewage in the existing technology is high, and the long-term addition of a single carbon source will affect the bacterial biomass of the denitrification section and the diversity of the denitrifying bacterial community structure. Therefore, a new low-cost composite carbon source is urgently needed. Summary of the invention

[0003] The purpose of the present invention is to provide a method for preparing a composite carbon source to solve the problems existing in the above-mentioned prior art.

[0004] To achieve the above object, the present invention provides the following solution: The present invention provides a method for preparing a composite carbon source, comprising the following steps:

[0005] Step 1: pre-treat the wastewater; filter, precipitate, and adjust the pH of the wastewater;

[0006] Step 2: pumping the wastewater and methanol pretreated in step 1 into a mixing tank; mixing the wastewater and methanol using mechanical stirring in the mixing tank to obtain a mixture;

[0007] Step 3, adding a surfactant and a growth factor to the mixture in step 2, and continuing to mix to obtain a carbon source;

[0008] Step 4: Test the density, viscosity and pH value of the mixed liquid obtained in step 3, and then transfer the mixed liquid to a storage tank for storage.

[0009] Preferably, in step one, the filtering method is to use a sieve to filter the fiber residue in the wastewater, and the pore size of the sieve is 100-200 meshes.

[0010] Preferably, in step 1, the precipitation method is to let the filtered wastewater stand for 24 hours or add a flocculant to settle the suspended matter; the flocculant is PAC.

[0011] Preferably, the rotation speed of the mechanical stirring in step 2 is 60-100 rpm.

[0012] Preferably, the weight proportion of methanol in the mixture of step 2 and step 3 is 5% to 15%, the surfactant is 5% to 10%, the growth factor is 0.5 to 1.5%, and the rest is pretreated wastewater.

[0013] The present invention discloses the following technical effects:

[0014] 1. By recycling the wastewater from the cellulose plant as raw material to produce a composite carbon source, the wastewater from the cellulose plant is recycled and reused, thereby improving resource utilization.

[0015] 2. Cellulose plant wastewater is a low-cost and easily available carbon source, which can significantly reduce the production cost of denitrification carbon source, has good economic benefits, and is suitable for large-scale application. Compared with a single carbon source, cellulose plant wastewater has a better utilization rate, can effectively promote the growth and metabolism of microorganisms, and can be used to treat sewage.

[0016] 3. The preparation method of the composite carbon source provided by the present invention is simple to operate, convenient to prepare, and easy to mass produce and utilize. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0018] Figure 1 A stirring device for making a composite carbon source according to the present invention;

[0019] Among them: 1. stirring tank body; 2. stirring drum; 3. stirring blade; 4. intermediate shaft; 5. spiral blade; 6. transmission box; 7. transmission shaft; 8. first transmission gear; 9. second transmission gear; 10. first matching gear; 11. second matching gear; 12. driving motor; 13. reflux box; 14. opening; 15. control block; 16. reflux groove; 17. compression spring; 18. lifting ring; 19. telescopic electric cylinder; 20. rotating ring; 21. cleaning shaft; 22. meshing gear; 23. cleaning blade; 24. fixed gear; 25. telescopic rod; 26. gear ring; 27. rotating motor; 28. driving gear; 29. ​​through groove; 30. control rod; 31. discharge port. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0022] The present invention provides a method for preparing a composite carbon source, comprising the following steps:

[0023] Step 1: pre-treat the wastewater; filter, precipitate, and adjust the pH of the wastewater;

[0024] Step 2: pumping the wastewater and methanol pretreated in step 1 into a mixing tank; mixing the wastewater and methanol using mechanical stirring in the mixing tank to obtain a mixture;

[0025] Step 3, adding a surfactant and a growth factor to the mixture in step 2, and continuing to mix to obtain a carbon source;

[0026] Step 4: Test the density, viscosity and pH value of the mixed liquid obtained in step 3, and then transfer the mixed liquid to a storage tank for storage.

[0027] Further optimizing the scheme, in step one, the filtering method is to use a sieve to filter the fiber residue in the wastewater, and the aperture of the sieve is 100 to 200 meshes.

[0028] To further optimize the scheme, in step one, the sedimentation method is to allow the filtered wastewater to stand for 24 hours or add a flocculant to allow the suspended matter to settle; the flocculant is PAC.

[0029] The scheme is further optimized, and the rotation speed of the mechanical stirring in step 2 is 60-100 rpm.

[0030] According to the further optimized scheme, the weight proportion of methanol in the mixture of step 2 and step 3 is 5% to 15%, the surfactant is 5% to 10%, the growth factor is 0.5 to 1.5%, and the rest is pretreated wastewater.

[0031] The solution is further optimized, where the growth factor is one or more of corn dry powder, beef dry powder, and yeast powder.

[0032] The present invention provides a composite carbon source production stirring device, comprising a stirring tank body 1, a stirring drum 2 is rotatably connected in the stirring tank body 1, a stirring blade 3 is fixedly connected to the peripheral side of the stirring drum 2, an intermediate shaft 4 is rotatably connected in the stirring drum 2, a spiral blade 5 is fixedly connected to the peripheral side of the intermediate shaft 4, the spiral blade 5 is located in the stirring drum 2, a driving component for driving the stirring drum 2 and the intermediate shaft 4 to rotate is installed on the top of the stirring tank body 1, and a reflux component and a cleaning component for cleaning the reflux component are installed in the stirring tank body 1.

[0033] A further optimized solution is that the drive assembly includes a transmission box 6 located on the top side, the top of the mixing drum 2 passes through the top wall of the mixing tank guard body and is located in the transmission box 6, the top of the intermediate shaft 4 is located in the transmission box 6 and is rotatably connected to the top wall of the transmission box 6; a transmission shaft 7 is rotatably connected in the transmission box 6, and a first transmission gear 8 and a second transmission gear 9 are fixedly connected to the transmission shaft 7, a first matching gear 10 meshing with the first transmission gear 8 is fixedly connected to the peripheral side of the mixing drum 2, and a second matching gear 11 meshing with the second transmission gear 9 is fixedly connected to the transmission shaft 7; a drive motor 12 is fixedly connected to the top of the transmission box 6, and the output shaft of the drive motor 12 is fixedly connected to the transmission shaft 7.

[0034] According to a further optimization scheme, the transmission ratio of the first transmission gear 8 to the first matching gear 10 is 1:2-1:3, and the transmission ratio of the second transmission gear 9 to the second matching gear 11 is 2:1-3:1. It is ensured that the mixing drum 2 is stirring at a low speed while the spiral blade 5 is rotating at a higher speed.

[0035] A further optimized solution is that the reflux assembly includes a reflux box 13 located in the mixing tank body 1, the reflux box 13 is fixedly connected to the inner wall of the mixing tank body 1 through a connecting rod, the mixing drum 2 passes through the reflux box 13 and rotates with the reflux box 13, a plurality of openings 14 are opened on the side of the mixing drum 2, and the openings 14 are higher than the top of the reflux box 13; a plurality of reflux ports are opened on the side wall of the reflux box 13, a control block 15 is slidably connected in the reflux port, a reflux groove 16 is opened on the bottom side of the control block 15, and the reflux groove 16 is connected to the inside of the reflux box 13; a compression spring 17 is fixedly connected between the control block 15 and the inner wall of the mixing tank body 1. The intermediate shaft 4 is driven to rotate by the driving assembly, and then the spiral blade 5 is driven to rotate. During the high-speed rotation, the spiral blade 5 can transport the mixed liquid at the bottom of the stirring tank body 1 through the opening 14 to the reflux box 13. Then, after the mixed liquid in the reflux box 13 gathers to a certain extent, the control block 15 is squeezed to make the reflux groove 16 at the bottom of the control block 15 communicate with the outside of the reflux box 6, so that the mixed liquid refluxes to the bottom of the stirring tank body 1 for stirring. By setting up the reflux assembly, the mixed liquid can continuously move to the bottom of the stirring tank body 1, which is convenient for full mixing, and it is also convenient to continuously add other raw materials to ensure full mixing.

[0036] Further optimization scheme, the cleaning component includes a lifting ring 18 that is slidably connected to the inner wall of the mixing tank body 1, and a telescopic electric cylinder 19 is installed between the lifting ring 18 and the top wall of the mixing tank body 1; a rotating ring 20 is rotatably connected in the lifting ring 18, and a plurality of cleaning shafts 21 are rotatably connected on the rotating ring 20, and the cleaning shaft 21 is arranged through the rotating ring 20, and a meshing gear 22 is fixedly connected to the top end of the cleaning shaft 21, and a cleaning blade 23 is fixedly connected to the bottom end of the cleaning shaft 21, and the cleaning blade 23 is arranged corresponding to the reflux box 13; A fixed gear 24 is arranged on the side of the mixing drum 2. The fixed gear 24 is located on the top surface of the rotating ring 20 and rotates with the rotating ring 20. The meshing gear 22 is located on the side of the fixed gear 24 and meshes with the fixed gear 24. A telescopic rod 25 is installed between the fixed gear 24 and the top wall of the mixing tank body 1. A gear ring 26 is fixedly connected to the top surface of the rotating ring 20. A rotating motor 27 is fixedly connected inside the lifting ring 18. The output shaft of the rotating motor 27 is fixedly connected to a driving gear 28, and the driving gear 28 meshes with the gear ring 26. The driving gear 28 is driven to rotate by the rotating motor 27, thereby driving the gear ring 26 and the rotating ring 20 to rotate. During the rotation process, the rotating ring 20 drives the cleaning blade 23 to make a circular motion along the rotating ring 20. At the same time, the cleaning shaft 21 makes a circular motion with the rotating ring 20. Due to the cooperation between the fixed gear 24 and the meshing gear 22, the cleaning shaft 21 is driven to rotate by itself, so that the cleaning blade 24 can rotate with the cleaning shaft 21, thereby cleaning the inside of the reflux box 13.

[0037] Further optimization scheme, the control block 15 is provided with a through slot 29 at the top of one end outside the reflux box 13, and the side wall of the through slot 29 away from the reflux box 13 is an inclined side wall, and the inclined side wall of the through slot 29 is inclined toward the top of the reflux box 13; the bottom wall of the lifting ring 18 is fixedly connected with a control rod 30, and the control rod 30 is arranged corresponding to the through slot 29; the bottom end of the control rod 30 is provided with an inclined surface adapted to the inclined side wall of the through slot 29. In the process of the lifting ring 18 being driven downward by the telescopic electric cylinder 19, the control rod 30 will be inserted into the through slot 29 and contact the inclined side wall of the through slot 29, and the control block 15 will be pulled out from the reflux port during the continuous downward movement, so that the residual solution remaining in the reflux box 13 can be cleaned out by the cleaning blade 23 to prevent waste.

[0038] According to a further optimization scheme, a discharge port 31 is provided at the bottom of the stirring tank body 1 ; a feed port is provided on the side wall of the stirring tank body 1 , and the feed port is lower than the height of the reflux box 13 .

[0039] In the description of the present invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0040] The embodiments described above are only descriptions of the preferred modes of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should all fall within the protection scope determined by the claims of the present invention.

Claims

1. A method for preparing a composite carbon source, characterized in that: The following steps are involved: Step 1: pre-treat the wastewater; Filter, precipitate and adjust pH of wastewater; Step 2: pumping the wastewater and methanol pretreated in step 1 into a mixing tank; mixing the wastewater and methanol using mechanical stirring in the mixing tank to obtain a mixture; Step 3, adding a surfactant and a growth factor to the mixture in step 2, and continuing to mix to obtain a carbon source; Step 4: Test the density, viscosity and pH value of the mixed liquid obtained in step 3, and then transfer the mixed liquid to a storage tank for storage.

2. The method for preparing a composite carbon source according to claim 1, characterized in that: In step 1, the filtering method is to use a screen to filter the fiber residue in the wastewater, and the aperture of the screen is 100-200 meshes.

3. The method for preparing the composite carbon source according to claim 1, characterized in that: In step 1, the sedimentation method is to let the filtered wastewater stand for 24 hours or add a flocculant to settle the suspended matter; the flocculant is PAC.

4. The method for preparing the composite carbon source according to claim 1, characterized in that: The rotation speed of the mechanical stirring in step 2 is 60-100 rpm.

5. The method for preparing the composite carbon source according to claim 1, characterized in that: The weight proportion of methanol in the mixture of step 2 and step 3 is 5% to 15%, the surfactant is 5% to 10%, the growth factor is 0.5 to 1.5%, and the rest is pretreated wastewater.

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