CN214360840U - Pig raising wastewater treatment system - Google Patents
Pig raising wastewater treatment system Download PDFInfo
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- CN214360840U CN214360840U CN202022570919.8U CN202022570919U CN214360840U CN 214360840 U CN214360840 U CN 214360840U CN 202022570919 U CN202022570919 U CN 202022570919U CN 214360840 U CN214360840 U CN 214360840U
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Abstract
The utility model relates to a pig raising wastewater treatment system belongs to livestock and poultry breeding wastewater treatment technical field. The anaerobic baffled reactor, the high-load activated sludge treatment unit and the segmented water inlet anoxic and aerobic treatment tank are sequentially communicated, and wastewater sequentially flows through the anaerobic baffled reactor, the high-load activated sludge treatment unit and the segmented water inlet anoxic and aerobic treatment tank to be treated. The anaerobic baffle plate reactor, the high-load activated sludge method and the staged water inlet anoxic-aerobic cooperative arrangement form the unification of functions and a tank body structure, are beneficial to reducing the occupied land, optimizing the basic investment, simultaneously enhancing the operation stability and reducing the operation cost.
Description
Technical Field
The utility model belongs to the technical field of waste water treatment is bred to beasts and birds, a wastewater treatment system of raising pigs is related to.
Background
The pig raising wastewater is characterized by high concentration of organic matters and ammonia nitrogen, large fluctuation of water quality and difficult treatment of organic matters removal and high-efficiency denitrification. At present, most of pig raising wastewater is anaerobically treated to form biogas slurry, and the biogas slurry is returned to the field. However, due to the limitation of the field, the field is not enough to absorb the biogas slurry, so that the biogas slurry must be discharged after further treatment. For biogas slurry, the overall carbon-nitrogen ratio is low, and the important difficulty is denitrification. In the prior art, the long biochemical retention time is mostly adopted, the nitrifying liquid is refluxed and part of carbon source is added for denitrification, and the construction cost and the operation cost are high. The existing pig-raising wastewater treatment system is low in treatment efficiency, complex in structure, insufficient in scope for adjustment in operation, incapable of coping with sudden pollution impact load and external conditions such as temperature change and the like, and incapable of stably reaching the standard for discharge.
SUMMERY OF THE UTILITY MODEL
In view of this, the utility model aims at providing a pig raising wastewater treatment system can improve the treatment effeciency and the treatment effeciency of pig raising wastewater, guarantees the treatment effect to sewage, satisfies the demand of stably discharging.
In order to achieve the above purpose, the utility model provides a following technical scheme: the utility model provides a pig raising wastewater treatment system which characterized in that: the anaerobic baffle plate reactor is communicated with the sectional water inlet anoxic and aerobic treatment tank, and wastewater sequentially flows through the anaerobic baffle plate reactor and the sectional water inlet anoxic and aerobic treatment tank to be treated.
Optionally, a high-load activated sludge treatment unit is arranged between the anaerobic baffled reactor and the segmented water inlet anoxic-aerobic treatment tank, the anaerobic baffled reactor, the high-load activated sludge treatment unit and the segmented water inlet anoxic-aerobic treatment tank are sequentially communicated, and wastewater sequentially flows through the anaerobic baffled reactor, the high-load activated sludge treatment unit and the segmented water inlet anoxic-aerobic treatment tank for treatment.
Optionally, the high-load activated sludge treatment unit comprises an aeration tank and a vertical sedimentation tank which are sequentially communicated, the aeration tank is communicated with the anaerobic baffle reactor, the vertical sedimentation tank is communicated with the segmental water inlet anoxic and aerobic treatment tank, and no filler is arranged in the aeration tank.
Optionally, the anaerobic baffle plate reactors are connected in series in 4 stages, and each stage is provided with a biogas collecting device; each stage comprises an ascending section and a descending section, and the volume ratio of the ascending section to the descending section in each stage is 3: 1.
Optionally, each stage of the anaerobic baffled reactor is independently fed with water, and the water feeding point is a descending section of each stage.
Optionally, the system further comprises a vertical flow type sedimentation tank, and the vertical flow type sedimentation tank is communicated with the segmented water inlet anoxic and aerobic treatment tank.
Optionally, a sludge pump for returning sludge is further arranged between the vertical sedimentation tank and the last stage aerobic tank of the segmental water inlet anoxic and aerobic treatment tank.
Optionally, the step-feed anoxic and aerobic treatment tanks are sequentially connected in series in 4 stages, each stage comprises an anoxic tank and an aerobic tank, and the ratio of the tank volumes of the anoxic tank and the aerobic tank in each stage is 1: 2.
Optionally, each stage of the segmental water inlet anoxic aerobic treatment tank independently feeds water, and the water inlet point is the anoxic tank of each stage.
Optionally, a stirrer is arranged in the anoxic tank of each stage, an aeration device is arranged at the bottom of the aerobic tank of each stage, and the stirrer is a submersible water impeller, a submersible stirrer, a hyperboloid stirrer or a paddle stirrer.
Optionally, the anaerobic baffled reactor, the high-load activated sludge treatment unit and the segmented water inlet anoxic and aerobic treatment tank are all rectangular structures.
Optionally, the wastewater is breeding wastewater discharged when a dry manure cleaning process is adopted in a live pig breeding process, and comprises pig urine, partial pig manure, feed residues, pigsty flushing water and domestic sewage.
Optionally, COD of the wastewater is less than or equal to 20000mg/L, and ammonia nitrogen of the wastewater is less than or equal to 1200 mg/L.
Optionally, the COD of the wastewater is 2000-8000 mg/L, and the ammonia nitrogen of the wastewater is 400-800 mg/L.
Optionally, the anaerobic baffle plate reactor is of 4 stages, the total hydraulic retention time of the anaerobic baffle plate reactor is 24-36 h, the single-stage hydraulic retention time is 6-9 h, and the sludge concentration is 10000-15000 mg/L; the staged water inlet anoxic aerobic process is 4 stages, the total hydraulic retention time of the staged water inlet anoxic aerobic process is 12-24 hours, the hydraulic retention time of each stage is 3-6 hours, and the overall sludge reflux ratio is controlled to be 100-200%.
Optionally, the dissolved oxygen concentration of the anoxic tank is 0.5-1 mg/L, and the dissolved oxygen concentration of the aerobic tank is 2-4 mg/L.
Optionally, the effluent of the anaerobic baffled reactor is treated by a high-load activated sludge method and then treated by a step-feed anoxic-aerobic process; in the treatment process of the high-load activated sludge method, the concentration of the sludge is 8000-12000 mg/L, the gas-water ratio is 10-15: 1, the sludge reflux ratio is 100-300%, and the total hydraulic retention time is 8-16 h.
Optionally, the volume load of the inlet water treated by the anaerobic baffled reactor is 5-15 kgCOD/(m3 d), and preferably 5-10 kgCOD/(m3 d).
Optionally, the residence time of the anaerobic baffled reactor treatment is 24-36 h, preferably 24 h.
Optionally, the biogas generated during the treatment of the anaerobic baffle reactor is used for generating electricity or directly burning to obtain heat energy after passing through a gas-water separator, a desulfurizing tower, a flame arrester, a gas storage system and a pressurization constant-pressure system.
Optionally, the return sludge enters only the first stage anoxic tank of the staged water inlet anoxic and aerobic treatment tank. Raw water enters each stage of anoxic tank respectively, the water inflow of the raw water at each stage can be adjusted according to the biochemical reaction conditions at each stage, and the adjusting factors comprise ammonia nitrogen, nitrate nitrogen, nitrite nitrogen and pH value, so that the denitrification reaction is maintained at a shortcut nitrification section, the carbon source is saved, and the operation cost is reduced.
The beneficial effects of the utility model reside in that:
(1) the pig raising wastewater belongs to easily degradable wastewater with high COD and simultaneously contains a large amount of nitrogen and phosphorus. To carry out biological nitrogen and phosphorus removal, most COD must be reduced. The nitrogen and phosphorus removal must be carried out at a relatively low COD. The wastewater is treated by an anaerobic baffle reactor and a step-feed anoxic-aerobic process in sequence. The anaerobic baffle plate reactor reduces more COD in the pig-raising wastewater, is favorable for performing nitrogen and phosphorus removal on the wastewater through the segmented water inlet anoxic and aerobic process, greatly improves the nitrogen and phosphorus removal effect of the segmented water inlet anoxic and aerobic process, improves the treatment efficiency of the pig-raising wastewater, can reduce the capacity of a treatment tank under the condition of the same treatment capacity, and achieves the purpose of simplifying a treatment system. The step-feed anoxic-aerobic treatment process can nitrify and denitrify the wastewater, denitrify the wastewater treated by the anaerobic baffled reactor, and remove the residual COD.
(2) The anaerobic baffle plate reactor is of a multi-stage series structure, has strong anti-pollution impact load capacity, can prevent the COD of sewage entering the sectional water inlet anoxic and aerobic treatment tank from being too high due to high COD impact, and ensures the denitrification and dephosphorization effects of the sectional water inlet anoxic and aerobic process. (3) And a high-load activated sludge treatment unit is also arranged between the anaerobic baffle reactor and the sectional water inlet anoxic and aerobic treatment tank, so that COD (chemical oxygen demand) in the pig raising wastewater can be further reduced, and the nitrogen and phosphorus removal effect of the sectional water inlet anoxic and aerobic process is ensured.
(4) The anaerobic baffle reactor, the high-load activated sludge treatment unit and the segmented water inlet anoxic and aerobic treatment tank are rectangular in structure, easy to arrange, compact in structure and capable of saving occupied space. During operation, the anaerobic baffle plate reactor and the multi-stage water inlet anoxic and aerobic water volumes can be adjusted in real time according to the change of the quality of the incoming water, so that the optimal growth condition of various microbial floras is ensured, and the requirement of standard discharge is further met. The anaerobic baffle plate reactor, the high-load activated sludge method and the staged water inlet anoxic and aerobic cooperative arrangement form the unification of functions and a tank body structure, are favorable for reducing the occupied land, optimizing the basic investment, simultaneously enhancing the operation stability and reducing the operation cost.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention. The objectives and other advantages of the invention may be realized and attained by the means of the instrumentalities and/or combinations particularly pointed out in the appended claims.
Drawings
For the purposes of promoting a better understanding of the objects, features and advantages of the invention, reference will now be made to the following detailed description taken in conjunction with the accompanying drawings in which:
FIG. 1 is a schematic structural view of a pig wastewater treatment system;
FIG. 2 is a flow chart of a pig wastewater treatment process;
FIG. 3 is a schematic structural view of a step-feed anoxic-aerobic treatment tank.
Reference numerals: the system comprises a regulating tank 1, an anaerobic baffle reactor 2, an aeration tank 3, a sectional water inlet anoxic and aerobic treatment tank 4, a vertical flow type sedimentation tank 5, a sewage pump 41, an anoxic tank 42, an aerobic tank 43, a stirrer 44, an air blower 45, a sludge pump 46 and an air flow meter 47.
Detailed Description
The following description of the embodiments of the present invention is provided for illustrative purposes, and other advantages and effects of the present invention will be readily apparent to those skilled in the art from the disclosure herein. The present invention can also be implemented or applied through other different specific embodiments, and various details in the present specification can be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the drawings provided in the following embodiments are only for illustrating the basic idea of the present invention, and the features in the following embodiments and examples may be combined with each other without conflict.
Wherein the showings are for the purpose of illustrating the invention only and not for the purpose of limiting the same, and in which there is shown by way of illustration only and not in any way limiting the scope of the invention; for a better understanding of the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
The same or similar reference numerals in the drawings of the embodiments of the present invention correspond to the same or similar parts; in the description of the present invention, it should be understood that if there are terms such as "upper", "lower", "left", "right", "front", "back", etc., indicating directions or positional relationships based on the directions or positional relationships shown in the drawings, it is only for convenience of description and simplification of description, but it is not intended to indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore, the terms describing the positional relationships in the drawings are only used for illustrative purposes and are not to be construed as limiting the present invention, and those skilled in the art can understand the specific meanings of the terms according to specific situations.
Referring to fig. 1 to 3, a pig-raising wastewater treatment system comprises a regulating tank 1, an anaerobic baffle reactor 2, a high-load activated sludge treatment unit, a staged-feed anoxic-aerobic treatment tank 4 and a vertical sedimentation tank 5 which are sequentially communicated.
The anaerobic baffle reactor 2 adopts a concrete pool or integrated steel equipment, and the whole pool shape of the anaerobic baffle reactor 2 is rectangular and can be arranged with other biochemical units in a cooperative way. The anaerobic baffle reactor 2 is connected in series in 4 stages, each stage comprises an ascending section and a descending section, and wastewater is hydrolyzed and acidified and generates methane in the ascending section to complete removal of COD and collection of methane. Each stage of the anaerobic baffle reactor 2 is respectively provided with a biogas collecting device, and the biogas collecting device comprises a gas collecting hood and a matched biogas purifying device which are arranged at the top of the anaerobic baffle reactor 2. The volume ratio of the ascending section to the descending section in each stage is 3: 1. Each stage is independently fed with water, and the water inlet point is a descending section of each stage. In the operation process, the accumulation condition of volatile fatty acid in the anaerobic biological treatment system is focused, and the change conditions of pH value, temperature and alkalinity are focused to timely adjust the water inflow and alkalinity of each stage of descending section.
The high-load activated sludge treatment unit adopts a concrete water tank or integrated steel equipment, and comprises an aeration tank 3 and a vertical flow type sedimentation tank 5 which are sequentially communicated, an anaerobic baffle reactor 2 is communicated with the aeration tank 3, the vertical flow type sedimentation tank 5 is communicated with a segmented water inlet anoxic aerobic treatment tank 4, and no filler is arranged in the aeration tank 3. The plane shape of the vertical sedimentation tank 5 is square, and the plane shape of the whole vertical sedimentation tank is rectangular after being combined with the aeration tank 3.
The sectional water inlet anoxic and aerobic treatment tank 4 adopts a concrete water tank or integrated steel equipment, the inside of the tank is divided into a plurality of single tanks which are communicated in sequence, water flow advances in the single tanks in sequence, and the single tanks are completely mixed. The sectional water inlet oxygen-poor aerobic treatment tank 4 is 4 stages which are connected in series in sequence, each stage comprises an oxygen-poor tank 42 and an aerobic tank 43, and a series combination of the oxygen-poor tank 42, the aerobic tank 43, the oxygen-poor tank 42 and the aerobic tank 43 is formed.
A submersible mixer 44 is arranged in each stage of the anoxic tank 42, so that muddy water is in a suspension state and cannot be deposited or form a large-area dead water area. Disc type or tubular type microporous aerators are arranged in each level of the aerobic tank 43, and meanwhile, an air blower 45 and an air flow meter 47 are matched, the type selection of the blower needs to meet the total oxygen supply requirement of all the aerobic tanks 43 and the high-load activated sludge process aeration tank 3, and the dissolved oxygen concentration of the aerobic tank 43 can reach 2-4 mg/L.
An intermediate lifting water tank is arranged between the sectional water inlet anoxic and aerobic treatment tank 4 and the high-load activated sludge treatment unit, each stage of the sectional water inlet anoxic and aerobic treatment tank 4 adopts a sewage pump 41 to independently feed water from the intermediate lifting water tank, and the water inlet point is an anoxic tank 42 of each stage. The number of the sewage pumps 41 corresponds to that of the anoxic tanks 42, and the sewage pumps 41 adopt variable frequency water pumps, so that the water outlet amount of the sewage pumps 41 can be adjusted in real time. The amount of the controlled water is adapted to the total amount of the nitrite and the nitrate in the effluent of each anoxic tank 42, so as to ensure that the denitrification reaction is maintained in the short-cut nitrification section. The operation personnel can also carry out manual intervention on the operation of the water pump according to the COD of the incoming water and the ammonia nitrogen reaction condition.
The vertical sedimentation tank 5 is communicated with the last stage aerobic tank 43 of the sectional water inlet anoxic and aerobic treatment tank 4, and the wastewater treated by the sectional water inlet anoxic and aerobic process enters the vertical sedimentation tank 5. A sludge pump 46 is also arranged between the vertical sedimentation tank 5 and the first stage anoxic tank 42 of the sectional water inlet anoxic and aerobic treatment tank and is used for returning sludge to the sectional water inlet anoxic and aerobic treatment tank 4.
The plane shape of the vertical sedimentation tank 5 is square, after the vertical sedimentation tank 5 and the anaerobic-aerobic tank 43 are combined, the vertical sedimentation tank 5 and the sectional water inlet anoxic-aerobic tank 43 are integrally arranged, and the plane shape of the whole is rectangular. The anaerobic baffle reactor 2, the high-load activated sludge treatment unit and the segmented water inlet anoxic and aerobic treatment tank 4 are all rectangular structures and can be combined into an integrated complete device or structure, so that the aims of saving land occupation and centralized management are fulfilled.
When the pig raising wastewater is actually treated, the method comprises the following steps:
s1, preprocessing: the pig-raising wastewater is breeding wastewater discharged when a dry manure cleaning process is adopted in the process of breeding live pigs, and comprises pig urine, partial pig manure, feed residues, pigsty flushing water and domestic sewage. Discharging the pig raising wastewater subjected to slag-water separation into an adjusting tank 1. COD of the wastewater is less than or equal to 20000mg/L, and ammonia nitrogen of the wastewater is less than or equal to 1200 mg/L. Most preferably, the COD of the wastewater is 2000-8000 mg/L, and the ammonia nitrogen of the wastewater is 400-800 mg/L.
S2, anaerobic baffled reactor treatment: a pump is arranged in the adjusting tank 1 to lift the pig raising wastewater into the anaerobic baffle reactor 2 for treatment, so that higher COD in the wastewater is reduced.
The anaerobic baffle reactor 2 is of 4 grades, the total hydraulic retention time of the anaerobic baffle reactor 2 is 24-36 h, the single-stage hydraulic retention time is 6-9 h, and the sludge concentration is 10000-15000 mg/L. The staged water inlet anoxic aerobic process is 4 stages, the total hydraulic retention time of the staged water inlet anoxic aerobic process is 12-24 hours, the hydraulic retention time of each stage is 3-6 hours, and the overall sludge reflux ratio is controlled to be 100-200%. The anaerobic baffle reactor can adjust the water inflow of each stage according to the quality of the incoming water, reduce the impact of the incoming water and enhance the operation stability of the system.
S3, high-load activated sludge treatment: the wastewater treated by the anaerobic baffle reactor enters an aeration tank 3 for treatment, and the wastewater treated by the aeration tank 3 enters a vertical sedimentation tank 5. The concentration of the activated sludge in the aeration tank 3 is 8000-12000 mg/L, no filler is arranged in the aeration tank 3, the gas-water ratio is 10-15: 1, the sludge reflux ratio is 100-300%, and the total hydraulic retention time of the high-load activated sludge process is 8-16 h. By adopting the high-load activated sludge method, a large amount of easily degradable organic matters generated by anaerobic treatment can be removed, the denitrification load is reduced, and the nitrifying bacteria are prevented from being inhibited due to the competition for dissolved oxygen. The packing is not arranged inside, so that paralysis caused by system blockage is avoided, and maintenance is facilitated. The high-load activated sludge process degrades most of the biodegradable COD in the effluent of the anaerobic baffled reactor 2 to reduce the load of subsequent biochemical treatment, stabilize the quality of the subsequent effluent and ensure the nitration reaction.
S4, step-feed anoxic and aerobic treatment: the wastewater treated by the high-load activated sludge process enters a sectional water inlet anoxic and aerobic treatment tank 4 for treatment. The staged water inlet anoxic aerobic process is 4 stages, the total hydraulic retention time of the staged water inlet anoxic aerobic process is 12-24 hours, the hydraulic retention time of each stage is 3-6 hours, and the overall sludge reflux ratio is controlled to be 100-200%. The wastewater treated by the step-feed anoxic-aerobic process enters a vertical sedimentation tank 5 and is discharged. The pig raising wastewater is treated by the staged water inlet anoxic aerobic process, and based on short-cut nitrification and denitrification, the biochemical tank volume is reduced, so that the capital construction cost is reduced, and the medicament addition is reduced, so that the operation cost is reduced.
If the discharged water quality needs to be further improved, a post-treatment unit can be arranged to further treat the wastewater treated by the segmental water inlet anoxic and aerobic process.
Finally, the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting, and 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, and all of them should be covered by the scope of the claims of the present invention.
Claims (9)
1. The utility model provides a pig raising wastewater treatment system which characterized in that: the anaerobic baffle plate reactor is communicated with the sectional water inlet anoxic and aerobic treatment tank, and wastewater sequentially flows through the anaerobic baffle plate reactor and the sectional water inlet anoxic and aerobic treatment tank to be treated;
a high-load activated sludge treatment unit is arranged between the anaerobic baffle reactor and the sectional water inlet anoxic and aerobic treatment tank, the anaerobic baffle reactor, the high-load activated sludge treatment unit and the sectional water inlet anoxic and aerobic treatment tank are communicated in sequence, and wastewater flows through the anaerobic baffle reactor, the high-load activated sludge treatment unit and the sectional water inlet anoxic and aerobic treatment tank in sequence for treatment.
2. The swine wastewater treatment system according to claim 1, wherein: the high-load activated sludge treatment unit comprises an aeration tank and a vertical sedimentation tank which are sequentially communicated, wherein the aeration tank is communicated with the anaerobic baffle reactor, the vertical sedimentation tank is communicated with the segmental water inlet anoxic and aerobic treatment tank, and no filler is arranged in the aeration tank.
3. The swine wastewater treatment system according to claim 1, wherein: the anaerobic baffle plate reactors are connected in series in 4 stages, each stage is provided with a biogas collecting device, each stage comprises an ascending section and a descending section, and the volume ratio of the ascending section to the descending section in each stage is 3: 1.
4. The swine wastewater treatment system according to claim 3, wherein: the anaerobic baffle plate reactor is characterized by also comprising a vertical flow type sedimentation tank, wherein the vertical flow type sedimentation tank is communicated with the segmented water inlet anoxic and aerobic treatment tank, water is independently fed into each stage of the anaerobic baffle plate reactor, and the water inlet point is a descending segment of each stage.
5. The swine wastewater treatment system according to claim 4, wherein: a sludge pump for returning sludge is also arranged between the vertical sedimentation tank and the last stage aerobic tank of the segmental water inlet anoxic-aerobic treatment tank.
6. The swine wastewater treatment system according to claim 1, wherein: the sectional water inlet anoxic and aerobic treatment tank is 4 stages which are connected in series in sequence, each stage comprises an anoxic tank and an aerobic tank, and the ratio of the tank volume of the anoxic tank to the tank volume of the aerobic tank in each stage is 1: 2.
7. The swine wastewater treatment system according to claim 6, wherein: and each stage of the sectional water inlet anoxic and aerobic treatment tank independently feeds water, and the water inlet point is the anoxic tank of each stage.
8. The swine wastewater treatment system according to claim 6, wherein: the anaerobic tank of each stage is internally provided with a stirrer, the bottom of the aerobic tank of each stage is provided with an aeration device, and the stirrer is a submersible water impeller, a submersible stirrer, a hyperboloid stirrer or a paddle stirrer.
9. The swine wastewater treatment system according to claim 1, wherein: the anaerobic baffle reactor, the high-load activated sludge treatment unit and the segmented water inlet anoxic and aerobic treatment tank are all rectangular structures.
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| CN202022570919.8U CN214360840U (en) | 2020-11-09 | 2020-11-09 | Pig raising wastewater treatment system |
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| CN202022570919.8U CN214360840U (en) | 2020-11-09 | 2020-11-09 | Pig raising wastewater treatment system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112174451A (en) * | 2020-11-09 | 2021-01-05 | 中冶赛迪工程技术股份有限公司 | Pig raising wastewater treatment process and system |
| CN115536228A (en) * | 2022-08-05 | 2022-12-30 | 杭州能源环境工程有限公司 | Livestock and poultry manure is cut back still field processing apparatus |
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2020
- 2020-11-09 CN CN202022570919.8U patent/CN214360840U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112174451A (en) * | 2020-11-09 | 2021-01-05 | 中冶赛迪工程技术股份有限公司 | Pig raising wastewater treatment process and system |
| CN115536228A (en) * | 2022-08-05 | 2022-12-30 | 杭州能源环境工程有限公司 | Livestock and poultry manure is cut back still field processing apparatus |
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