Integrated equipment and method for efficient treatment of garbage leachate from garbage transfer station
By designing integrated treatment equipment in garbage transfer stations, using multiple-stage treatment processes and several times of hydraulic reflux of the bioefficiency reaction tank, the problems of low efficiency and high cost of leachate treatment at garbage transfer stations are solved, and efficient pollutants are achieved Removal and cost reduction.
Patent Information
- Application Number
- CN202011416338.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2020-12-04
- Publication Date
- 2024-12-31
- Estimated Expiration
- 2040-12-04
AI Technical Summary
In the prior art, the waste leachate treatment efficiency of garbage transfer stations is low and has high cost, and cannot effectively degrade the high concentration of various pollutants, resulting in low treatment efficiency and high cost.
An integrated equipment for efficient treatment of garbage leachate at garbage transfer stations is designed, including a regulation tank, a tube-type coagulation and flocculation unit, a biological synergistic reaction tank, a sulfate radical oxidation tank and a contact oxidation tank. Through the tandem processing process, Multi-stage pollutant removal is achieved by using PAM flocculation, several times of hydraulic reflux of the bioefficiency reaction tank, PH regulation and contacting the oxidation tank.
Through the combination of tube-type concrete flocculation units and bioefficiency reaction tanks, the use of PAM is reduced, the cost is reduced, the pollutant removal efficiency is improved, the life of bacterial groups is extended, and more than 30% of pollutants is achieved. Removal significantly improves processing efficiency and reduces costs.
Smart Images
Figure CN112390474B_ABST
Abstract
Description
Technical Field
[0001] The invention relates to an integrated device and method for efficiently treating garbage leachate at a garbage transfer station, belonging to the technical field of treating garbage leachate at a garbage transfer station. Background Art
[0002] As people's living standards continue to improve, the requirements for environmental conditions are also increasing. Traditional urban and rural garbage stations can no longer meet people's requirements for new concepts such as high efficiency, environmental protection, energy saving and low consumption. At present, the way of urban and rural garbage disposal is generally to use small vehicles to collect community garbage to landfills, and then compress the garbage in the landfills and treat the leachate. However, the leachate in the landfill generally has a high salt content, and ammonia nitrogen is easily converted into biogas volatilization after long-term storage. Therefore, the leachate treatment process of the landfill is relatively complicated, and the salt content needs to be reduced to below the standard. Emissions: Since large-scale landfills are generally far away from cities, small vehicles transport garbage to garbage transfer stations for concentration and compression, and compress the loose garbage, which will produce a large amount of leachate. The leachate from the garbage transfer station has a relatively small decay reaction, so it has a low salt content and a high ammonia nitrogen content. After treatment, it can be directly discharged into the municipal pipe network. The existing technology for treating leachate from garbage transfer stations is not mature. The leachate contains many types of pollutants and has a high concentration, which cannot be effectively degraded by a single treatment method. Therefore, the garbage treatment efficiency is low and the cost is high. Summary of the invention
[0003] In view of the deficiencies in the prior art, the present invention provides an integrated device and method for efficiently treating leachate from a garbage transfer station, so as to solve the technical problems in the prior art of low treatment efficiency and high treatment cost of leachate from a garbage transfer station.
[0004] The technical solution of the present invention to solve the above technical problems is as follows: an integrated device for efficiently treating leachate from a garbage transfer station, comprising a regulating tank, a tubular coagulation and flocculation unit, a biological enhancement reaction tank, a sulfate radical oxidation tank and a contact oxidation tank, the water inlet of the tubular coagulation and flocculation unit being connected to the water outlet of the regulating tank, a primary sedimentation tank being connected in series between the tubular coagulation and flocculation unit and the biological enhancement reaction tank, a sulfate radical oxidation tank being connected in series between the biological enhancement reaction tank and the contact oxidation tank, the water outlet of the contact oxidation tank being also connected to a secondary sedimentation tank, the sludge in the sedimentation zone of the biological enhancement reaction tank being returned to the tubular coagulation and flocculation unit, and a part of the effluent from the sedimentation zone of the biological enhancement reaction tank being returned to the aeration zone at several times the hydraulic force.
[0005] Based on the above technical solution, the present invention can also be improved as follows.
[0006] Furthermore, a pH regulating tank is connected in series between the biosynergistic reaction tank and the sulfate radical oxidation tank, and the pH regulating tank is provided with a drug adding port.
[0007] Furthermore, the sludge outlets of the primary sedimentation tank and the secondary sedimentation tank are connected to a plate-frame filter press, the plate-frame filter press is provided with a filter press water outlet and a filter cake outlet, and the filter press water outlet of the plate-frame filter press is connected to a regulating tank.
[0008] Furthermore, the tubular coagulation and flocculation unit is provided with a drug addition port for adding PAM.
[0009] Furthermore, the contact oxidation tank is configured as a fixed bed biofilm, and activated carbon fiber filler is selected as a biofilm carrier.
[0010] Furthermore, a grille is provided at the water inlet of the regulating tank.
[0011] A method for treating garbage leachate from a garbage transfer station by an integrated device for efficiently treating the leachate, the method comprising the following steps: S1: leachate water enters a tubular coagulation and flocculation unit from a regulating tank, PAM is added into the tubular coagulation and flocculation unit for flocculation, and then enters a primary sedimentation tank for sedimentation; S2: sewage enters an aeration zone of a biological enhancement reaction tank for aeration and ammonia nitrogen removal treatment after sedimentation in the primary sedimentation tank, and then enters a sedimentation zone for sedimentation, the effluent from the sedimentation zone is hydraulically refluxed to the aeration zone at several times the water inlet of the biological enhancement reaction tank, and at the same time, the sludge in the sedimentation zone of the biological enhancement reaction tank is refluxed to the tubular coagulation and flocculation unit and combined with PAM to coagulate and flocculate the sewage; S3: the effluent from the sedimentation zone of the biological enhancement reaction tank enters a pH regulating tank for pH adjustment, and then enters a sulfate radical oxidation tank for organic matter removal; S4: sewage enters a contact oxidation tank from a sulfate radical oxidation tank for ammonia nitrogen removal treatment; S5: sewage enters a secondary sedimentation tank from a contact oxidation tank for sedimentation, and the effluent from the secondary sedimentation tank can be discharged to a municipal pipe network.
[0012] Furthermore, the hydraulic reflow multiple of the sedimentation zone of the bio-enhancement reaction tank is 20 times the water inflow of the bio-enhancement reaction tank, and the sludge reflow multiple of the sedimentation zone is 2 times the water inflow of the tubular coagulation and flocculation unit.
[0013] Furthermore, the sludge in the secondary sedimentation tank and the primary sedimentation tank enters the plate and frame filter press, the filtered water flows back to the regulating tank, and the filter cake is transported out.
[0014] Furthermore, the pH adjusting tank adds acid to adjust the pH to 6.
[0015] Furthermore, the sewage is processed by a screen before entering the regulating tank.
[0016] The invention has the following beneficial effects: by setting a tubular coagulation and flocculation unit and a biological enhancement reaction tank, adding PAM for flocculation, combining the sludge returned from the biological enhancement reaction tank, utilizing the microbial floccules in the sludge in combination with PAM, reducing the usage of PAM by 50%, reducing the cost, utilizing the dual combination of floccules and PAM for sedimentation, completing the removal of more than 30% of pollutants, and greatly increasing the flocculation effect; the biological enhancement reaction tank adopts several times hydraulic reflux to the aeration zone, abandoning the technical bias of only being able to reflux to the regulating tank and the larger later biochemical process in the traditional technology, utilizing a through-wall pump to increase the reflux volume, thereby quickly diluting the sewage concentration at the water inlet of the biological enhancement reaction tank, reducing the processing pressure of the floccules, being beneficial to protecting the floccules and extending their lifespan, and improving the processing efficiency of the leachate. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] Figure 1 It is a schematic diagram of the process flow of the present invention;
[0018] Figure 2 The figure is a flow chart of the processing method of the present invention. DETAILED DESCRIPTION
[0019] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.
[0020] An integrated device for efficiently treating landfill leachate at a garbage transfer station comprises a regulating tank, a tubular coagulation and flocculation unit, a biological enhancement reaction tank, a sulfate radical oxidation tank and a contact oxidation tank. A grid is arranged at the water inlet of the regulating tank to intercept and remove large impurities in the leachate water. The tubular coagulation and flocculation unit is provided with a drug addition port for adding PAM. The water inlet of the tubular coagulation and flocculation unit is connected to the water outlet of the regulating tank. The water quality and water quantity of the leachate are adjusted through the regulating tank to achieve the purpose of homogenization and equalization. The tubular coagulation and flocculation unit and the biological enhancement reaction tank are connected to the water inlet of the regulating tank. A primary sedimentation tank is connected in series between the reaction tanks to perform preliminary precipitation of the leachate from the tubular coagulation and flocculation unit. A pH adjustment tank is connected in series between the biological enhancement reaction tank and the sulfate radical oxidation tank to adjust the pH value of the sewage. The sulfate radical oxidation tank is connected to the contact oxidation tank, and the outlet of the contact oxidation tank is also connected to the secondary sedimentation tank. The contact oxidation tank is configured as a fixed bed biofilm, and activated carbon fiber filler is selected as the biofilm carrier. The sewage to be treated contacts the biofilm through the filler, and the biofilm and the suspended activated sludge work together to achieve the purpose of purifying the wastewater. The sludge in the sedimentation zone of the biological enhancement reaction tank is returned to the tubular coagulation and flocculation unit. By setting the tubular coagulation and flocculation unit and the biological enhancement reaction tank, PAM is added for flocculation, and the sludge returned from the biological enhancement reaction tank is combined with the microbial floccules in the sludge to reduce the use of PAM by 50%, reduce the cost, and use the floccules and PAM for double combined sedimentation to complete the removal of more than 30% of pollutants, which greatly increases the flocculation effect. A part of the effluent from the sedimentation zone of the biological enhancement reaction tank is returned to the aeration zone by a through-the-wall pump at several times the hydraulic force. The biological enhancement reaction tank abandons the technical prejudice that the traditional technology can only return to the regulating tank and the later biochemical process is relatively large. The through-the-wall pump is used to increase the reflux volume, thereby quickly diluting the sewage concentration at the water inlet of the biological enhancement reaction tank, reducing the treatment pressure of the floccules, which is beneficial to protecting the floccules and extending their life, and improving the treatment efficiency of the leachate.
[0021] The sludge outlets of the primary sedimentation tank and the secondary sedimentation tank are connected to the plate and frame filter press, and the plate and frame filter press is provided with a filter press water outlet and a filter cake outlet. The filter press water outlet of the plate and frame filter press is connected to the regulating tank, and the sludge in the secondary sedimentation tank and the primary sedimentation tank enters the plate and frame filter press, the filter press water flows back to the regulating tank, and the filter cake is transported out to achieve the purpose of zero discharge.
[0022] The above-mentioned treatment method of the integrated equipment for efficient treatment of leachate from garbage transfer stations comprises the following steps: S1: the leachate is first treated by a grid before entering the regulating tank, and then enters the tubular coagulation and flocculation unit through the regulating tank, PAM is added to the tubular coagulation and flocculation unit for flocculation, and then enters the primary sedimentation tank for sedimentation; S2: after sedimentation in the primary sedimentation tank, the sewage enters the aeration zone of the biological enhancement reaction tank for aeration to remove ammonia nitrogen, and then enters the sedimentation zone for sedimentation, and the effluent from the sedimentation zone is hydraulically refluxed to the aeration zone at several times the water inlet of the biological enhancement reaction tank, and the hydraulic reflux multiple of the sedimentation zone of the biological enhancement reaction tank is the water inlet of the biological enhancement reaction tank. The water volume is 20 times that of the original water volume. At the same time, the sludge in the sedimentation zone of the biological enhancement reaction tank is returned to the tubular coagulation and flocculation unit to combine with PAM to coagulate and flocculate the sewage. The sludge return multiples of the sedimentation zone are twice the water volume of the tubular coagulation and flocculation unit; S3: The effluent from the sedimentation zone of the biological enhancement reaction tank enters the pH adjustment tank for pH adjustment, and the pH is adjusted to 6 by adding acid in the pH adjustment tank, and then enters the sulfate radical oxidation tank for organic matter removal; S4: The sewage enters the contact oxidation tank from the sulfate radical oxidation tank for ammonia nitrogen removal treatment; S5: The sewage enters the secondary sedimentation tank from the contact oxidation tank for sedimentation, and the effluent from the secondary sedimentation tank can be discharged to the municipal pipe network.
[0023] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims
1. An integrated device for efficiently treating leachate from a garbage transfer station, characterized in that: The invention comprises a regulating tank, a tubular coagulation and flocculation unit, a biological enhancement reaction tank, a sulfate radical oxidation tank and a contact oxidation tank. The water inlet of the tubular coagulation and flocculation unit is connected with the water outlet of the regulating tank. A primary sedimentation tank is connected in series between the tubular coagulation and flocculation unit and the biological enhancement reaction tank. A sulfate radical oxidation tank is connected in series between the biological enhancement reaction tank and the contact oxidation tank. The water outlet of the contact oxidation tank is also connected with a secondary sedimentation tank. The sludge in the sedimentation zone of the biological enhancement reaction tank is returned to the tubular coagulation and flocculation unit. The sludge return multiple of the sedimentation zone is twice the water inlet of the tubular coagulation and flocculation unit. A part of the effluent in the sedimentation zone of the biological enhancement reaction tank is hydraulically returned to the aeration zone at several times. The hydraulic return multiple of the sedimentation zone of the biological enhancement reaction tank is 20 times the water inlet of the biological enhancement reaction tank. The tubular coagulation and flocculation unit is provided with a drug addition port for adding PAM.
2. The integrated equipment for efficiently treating leachate from a garbage transfer station according to claim 1 is characterized by: A pH regulating pool is also connected in series between the biosynergistic reaction pool and the sulfate radical oxidation pool, and the pH regulating pool is provided with a drug adding port.
3. The integrated equipment for efficiently treating leachate from a garbage transfer station according to claim 2 is characterized by: The sludge outlets of the primary sedimentation tank and the secondary sedimentation tank are connected to a plate-frame filter press, the plate-frame filter press is provided with a filter press water outlet and a filter cake outlet, and the filter press water outlet of the plate-frame filter press is connected to a regulating tank.
4. The integrated equipment for efficiently treating leachate from a garbage transfer station according to any one of claims 1 to 3, characterized in that: The contact oxidation tank is configured as a fixed bed biofilm, and activated carbon fiber filler is selected as a biofilm carrier.
5. The integrated equipment for efficiently treating leachate from a garbage transfer station according to claim 4 is characterized by: A grid is provided at the water inlet of the regulating tank.
6. A method for efficiently treating landfill leachate from a garbage transfer station by using an integrated device, based on the integrated device described in any one of claims 1 to 5, characterized in that: The method comprises the following steps: S1: the percolation water enters the tubular coagulation and flocculation unit from the regulating tank, PAM is added into the tubular coagulation and flocculation unit for flocculation, and then enters the primary sedimentation tank for sedimentation; S2: the sewage enters the aeration zone of the biological enhancement reaction tank for aeration and ammonia nitrogen removal treatment after sedimentation in the primary sedimentation tank, and then enters the sedimentation zone for sedimentation, and the effluent from the sedimentation zone is hydraulically returned to the aeration zone at several times the water inlet of the biological enhancement reaction tank, and at the same time, the sludge in the sedimentation zone of the biological enhancement reaction tank is returned to the tubular coagulation and flocculation unit and combined with PAM to coagulate and flocculate the sewage; S3: the effluent from the sedimentation zone of the biological enhancement reaction tank enters the pH adjustment tank for pH adjustment, and then enters the sulfate radical oxidation tank for organic matter removal; S4: the sewage enters the contact oxidation tank from the sulfate radical oxidation tank for ammonia nitrogen removal treatment; S5: the sewage enters the secondary sedimentation tank from the contact oxidation tank for sedimentation, and the effluent from the secondary sedimentation tank is discharged to the municipal pipe network.
7. The method for treating the garbage transfer station leachate with an integrated device for efficient treatment of the leachate according to claim 6, characterized in that: The sludge in the secondary sedimentation tank and the primary sedimentation tank enters the plate and frame filter press, the filtered water flows back to the regulating tank, and the filter cake is transported out.
8. The method for treating the garbage transfer station leachate with an integrated device for efficient treatment of the leachate according to claim 7, characterized in that: The sewage is first processed by a screen before entering the regulating tank, and the pH is adjusted to 6 by adding acid in the pH regulating tank.