CN112661354A - System and method for treating breeding wastewater of dairy farm - Google Patents
System and method for treating breeding wastewater of dairy farm Download PDFInfo
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- CN112661354A CN112661354A CN202011521738.4A CN202011521738A CN112661354A CN 112661354 A CN112661354 A CN 112661354A CN 202011521738 A CN202011521738 A CN 202011521738A CN 112661354 A CN112661354 A CN 112661354A
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Abstract
The invention discloses a system and a method for treating breeding wastewater in a dairy farm, wherein the wastewater treatment system comprises a spiral shell stacking machine, an air flotation machine, an anaerobic tank, a primary sedimentation tank, a contact oxidation tank, a secondary sedimentation tank and a disinfection system, wherein a water outlet of the spiral shell stacking machine is connected with a water inlet of the air flotation tank; the water outlet of the air floatation tank is connected with the water inlet of the anaerobic tank, the water outlet of the anaerobic tank is connected with the water inlet of the primary sedimentation tank, the water outlet of the primary sedimentation tank is connected with the water inlet of the contact oxidation tank, the water outlet of the contact oxidation tank is connected with the water inlet of the secondary sedimentation tank, and the water outlet of the secondary sedimentation tank is connected with the water inlet of the disinfection system. The invention can treat the wastewater for recycling or farmland irrigation, uses the sludge for composting, realizes zero discharge of the wastewater treatment, and solves the problems of unstable wastewater treatment effect, long treatment period, incapability of stably reaching the standard and the like of the conventional dairy farm.
Description
Technical Field
The invention belongs to the technical field of wastewater treatment, and particularly relates to a system and a method for treating breeding wastewater of a dairy farm.
Background
Along with the improvement of living standard of people and the increase of the demand of dairy products, the large-scale breeding is increased day by day, and the environmental problem caused by the dairy cow breeding excrement sewage is more prominent. Therefore, the search for an efficient and low-cost processing method becomes a major research direction.
The wastewater of the dairy farm mainly comprises feces, productive water and domestic water. The waste water has the characteristics of high SS, high organic matter, high ammonia nitrogen and large odor. After flowing out, the water body is seriously eutrophicated and is also a medium for the spread of various diseases.
At present, the domestic large-scale dairy farm breeding wastewater mainly adopts a conventional breeding wastewater treatment system of dry-wet separation, anaerobic biogas production and aerobic biochemical treatment, but because cattle are ruminants eating grass, the dairy farm manure wastewater is different from other breeding wastewater, and the water contains a large amount of fine fibers. Therefore, the development of a system for treating the wastewater from dairy farm cultivation, which aims at the characteristics of the wastewater, has reliable and stable process and relatively low cost and does not cause secondary pollution, is urgently needed.
Disclosure of Invention
The invention provides a system and a method for treating breeding wastewater of a dairy farm, aiming at solving the problems in the prior art.
The technical scheme of the invention is as follows:
a system for treating breeding wastewater of a dairy farm comprises a spiral shell stacking machine, an air floatation machine, an anaerobic tank, a primary sedimentation tank, a contact oxidation tank, a secondary sedimentation tank and a disinfection system, wherein a water outlet of the spiral shell stacking machine is connected with a water inlet of the air floatation tank; the water outlet of the air floatation tank is connected with the water inlet of the anaerobic tank, the water outlet of the anaerobic tank is connected with the water inlet of the primary sedimentation tank, the water outlet of the primary sedimentation tank is connected with the water inlet of the contact oxidation tank, the water outlet of the contact oxidation tank is connected with the water inlet of the secondary sedimentation tank, and the water outlet of the secondary sedimentation tank is connected with the water inlet of the disinfection system.
Preferably, the system for treating the breeding wastewater of the dairy farm further comprises a flocculating agent adding device and a coagulating agent adding device, wherein a water inlet of the spiral shell stacking machine is connected with an outlet of the flocculating agent adding device and an outlet of the coagulating agent adding device, and a water inlet of the air flotation machine is connected with an outlet of the flocculating agent adding device and an outlet of the coagulating agent adding device.
Preferably, the system for treating the breeding wastewater of the dairy farm further comprises a vertical flow type sludge concentration tank and a sludge dewatering machine, wherein a sludge inlet of the vertical flow type sludge concentration tank is connected with a sludge discharge port of the air flotation machine, and a sludge outlet of the vertical flow type sludge concentration tank is connected with a sludge inlet of the sludge dewatering machine.
Preferably, the system for treating the breeding wastewater of the dairy farm further comprises a vertical flow type sludge concentration tank and a sludge dewatering machine, wherein a sludge discharge port of the primary sedimentation tank is divided into two paths, one path is connected with a sludge inlet of the vertical flow type sludge concentration tank, the other path is connected with an anaerobic tank, and a sludge outlet of the vertical flow type sludge concentration tank is connected with a sludge inlet of the sludge dewatering machine.
Preferably, the system for treating the breeding wastewater of the dairy farm further comprises a vertical flow type sludge concentration tank and a sludge dewatering machine, wherein a sludge discharge port of the secondary sedimentation tank is divided into three paths, one path is connected with a sludge inlet of the vertical flow type sludge concentration tank, the other path is connected with the anaerobic tank, the other path is connected with the contact oxidation tank, and a sludge outlet of the vertical flow type sludge concentration tank is connected with a sludge inlet of the sludge dewatering machine.
Preferably, an inlet of the screw stacking machine is connected with an outlet of the dry-wet separation rear water collecting tank, a water outlet of the sludge dewatering machine is connected to the inlet of the dry-wet separation rear water collecting tank, a water outlet of the vertical flow type sludge concentrating tank is connected to the inlet of the dry-wet separation rear water collecting tank, and a water inlet of the sludge dewatering machine is connected with a flocculating agent feeding device and a coagulant feeding device.
Preferably, the contact oxidation pond is filled with filler and is connected with a blast aeration system.
Preferably, the disinfection system comprises a disinfection tank and a chlorine dioxide generator, wherein a water inlet of the disinfection tank is connected with a water outlet of the secondary sedimentation tank, and the disinfection tank is connected with the chlorine dioxide generator.
Preferably, the water outlet of the disinfection tank is connected with a clean water tank.
The invention relates to a method for treating breeding wastewater of a dairy farm, which is carried out by the breeding wastewater treatment system of the dairy farm, and comprises the following steps:
pretreatment: feeding the raw water subjected to dry-wet separation into a spiral shell stacking machine, and mixing the raw water, a flocculating agent and a coagulating agent in the spiral shell stacking machine to perform solid-liquid separation; mixing the liquid obtained by the separation of the screw stacking machine with a flocculating agent and a coagulant, and then feeding the mixture into an air flotation machine, wherein the liquid is subjected to slag-water separation in the air flotation machine; discharging scum in the air floatation machine, and allowing liquid to enter an anaerobic tank;
biochemical treatment: the anaerobic tank carries out anaerobic treatment and gas-solid-liquid separation on the liquid discharged by the air flotation machine, and the liquid obtained by separation is discharged into a primary sedimentation tank; carrying out sludge-water separation on the liquid discharged from the anaerobic tank in a primary sedimentation tank, and enabling the separated liquid to flow into a contact oxidation tank; degrading organic matters, ammonia nitrogen and phosphorus in the inflowing liquid by the contact oxidation tank; the liquid treated by the contact oxidation tank flows into a secondary sedimentation tank for sludge-water separation;
and (3) disinfection treatment: and (4) the liquid in the secondary sedimentation tank enters a disinfection system for disinfection treatment, and the liquid treated by the disinfection system is discharged.
The invention has the following beneficial effects:
the system for treating the breeding wastewater of the dairy farm is provided with the screw stacking machine and the air flotation machine, and raw water passes through the screw stacking machine and the air flotation machine to reduce the content of suspended matters and organic matters in the wastewater, thereby greatly reducing the difficulty of subsequent anaerobic treatment. The invention adopts the primary sedimentation tank behind the anaerobic tank, and the primary sedimentation tank separates eliminated sludge and refractory SS brought out by the effluent of the anaerobic tank, thereby reducing the treatment load of the subsequent contact oxidation tank. The invention can treat the cattle raising wastewater and the milking room wastewater in the dairy plant together, saves time and labor, is used for recycling and field irrigation after the wastewater is treated, is used for composting sludge, saves energy, protects environment, recycles the wastewater, realizes zero discharge of the wastewater, and solves the problems of unstable wastewater treatment effect, long treatment period, incapability of stably reaching the standard and the like of the existing farm.
Furthermore, the proportion of the flocculating agent and the coagulating agent can be controlled through a flocculating agent feeding device and a coagulating agent feeding device, so that slag and water separation can be effectively carried out in the screw stacking machine and the air floatation machine, suspended matters in wastewater are reduced, and the difficulty of subsequent anaerobic treatment is reduced.
Furthermore, by arranging the vertical flow type sludge concentration tank and the sludge dewatering machine, the produced sludge can be used for composting and resource utilization, and the separated liquid can be sent into the source of sewage treatment again for retreatment, so that zero discharge or lower discharge of wastewater is realized.
Drawings
FIG. 1 is a process flow diagram of the treatment of wastewater from dairy farms according to the present invention;
fig. 2 is a schematic structural view of an air floatation machine for cavitation in accordance with an embodiment of the present invention.
In the figure, a screw stacking machine 1, an air flotation machine 2, an anaerobic tank 3, a primary sedimentation tank 4, a contact oxidation tank 5, a secondary sedimentation tank 6, a disinfection tank 7, a clean water tank 8, a sludge concentration tank 9, a sludge dewatering machine 10, a flocculating agent adding device 11, a coagulating agent adding device 12, a blast aeration system 13, a chlorine dioxide generator 14, a pipeline mixer 15, an aerator 16, an aeration chamber 17, a slag scraping machine 18, a separation chamber 19, a scum discharge port 20, a waste liquid discharge port 21 and a slag discharge device 22 are arranged.
Detailed Description
The invention is described in detail below with reference to the drawings and the detailed description.
Referring to fig. 1, the system for treating the breeding wastewater of the dairy farm comprises a spiral shell stacking machine 1, an air flotation machine 2, an anaerobic tank 3, a primary sedimentation tank 4, a contact oxidation tank 5, a secondary sedimentation tank 6 and a disinfection system, wherein a water outlet of the spiral shell stacking machine 1 is connected with a water inlet of the air flotation tank 2; the water outlet of the air floatation tank 2 is connected with the water inlet of the anaerobic tank 3, the water outlet of the anaerobic tank 3 is connected with the water inlet of the primary sedimentation tank 4, the water outlet of the primary sedimentation tank 4 is connected with the water inlet of the contact oxidation tank 5, the water outlet of the contact oxidation tank 5 is connected with the water inlet of the secondary sedimentation tank 6, and the water outlet of the secondary sedimentation tank 6 is connected with the water inlet of the disinfection system.
As a preferable embodiment of the invention, the system for treating the culture wastewater of the dairy farm further comprises a flocculant adding device 11 and a coagulant adding device 12, the water inlet of the spiral shell stacking machine 1 is connected with the outlet of the flocculant adding device 11 and the outlet of the coagulant adding device 12, and the water inlet of the air flotation machine 2 is connected with the outlet of the flocculant adding device 11 and the outlet of the coagulant adding device 12.
As a preferable embodiment of the invention, the system for treating the breeding wastewater of the dairy farm further comprises a vertical flow type sludge concentration tank 9 and a sludge dewatering machine 10, wherein a sludge inlet of the vertical flow type sludge concentration tank 9 is connected with a sludge discharge port of the air flotation machine 2, and a sludge outlet of the vertical flow type sludge concentration tank 9 is connected with a sludge inlet of the sludge dewatering machine 10.
As a preferable embodiment of the invention, the system for treating the breeding wastewater of the dairy farm further comprises a vertical flow type sludge concentration tank 9 and a sludge dewatering machine 10, wherein a sludge discharge port of the primary sedimentation tank 4 is divided into two paths, one path is connected with a sludge inlet of the vertical flow type sludge concentration tank, the other path is connected with the anaerobic tank 3, and a sludge outlet of the vertical flow type sludge concentration tank 9 is connected with a sludge inlet of the sludge dewatering machine 10.
As a preferred embodiment of the invention, the system for treating the breeding wastewater of the dairy farm further comprises a vertical flow type sludge concentration tank 9 and a sludge dewatering machine 10, the sludge discharge port of the secondary sedimentation tank 6 is divided into three paths, one path is connected with the sludge inlet of the vertical flow type sludge concentration tank 9, the other path is connected with the anaerobic tank 3, the other path is connected with the contact oxidation tank 5, and the sludge outlet of the vertical flow type sludge concentration tank 9 is connected with the sludge inlet of the sludge dewatering machine 10.
As a preferred embodiment of the invention, the inlet of the screw overlapping machine 1 is connected with the outlet of the dry-wet separation water collecting tank, the water outlet of the sludge dewatering machine 10 is connected with the inlet of the dry-wet separation water collecting tank, the water outlet of the vertical flow type sludge concentrating tank 9 is connected with the inlet of the dry-wet separation water collecting tank, and the water inlet of the sludge dewatering machine 10 is connected with a flocculating agent adding device 11 and a coagulant adding device 12.
As a preferred embodiment of the present invention, the contact oxidation tank 5 is filled with a packing, and the contact oxidation tank 5 is connected to a blast aeration system 13.
As a preferred embodiment of the invention, the disinfection system comprises a disinfection tank 7 and a chlorine dioxide generator 14, wherein the water inlet of the disinfection tank 7 is connected with the water outlet of the secondary sedimentation tank 6, and the disinfection tank 7 is connected with the chlorine dioxide generator 14.
As a preferred embodiment of the invention, a clean water tank 8 is connected to the water outlet of the disinfection tank 7, and the water from the disinfection tank 7 flows into the clean water tank 8.
The method for treating the breeding wastewater of the dairy farm is carried out by the system for treating the breeding wastewater of the dairy farm, which comprises the following steps:
pretreatment: the raw water after the dry-wet separation enters a screw stacking machine 1, and the raw water, a flocculating agent and a coagulating agent are mixed in the screw stacking machine 1 to carry out solid-liquid separation; mixing the liquid separated by the screw stacking machine 1 with a flocculating agent and a coagulant, then feeding the mixture into an air flotation machine 2, and carrying out slag-water separation on the liquid in the air flotation machine 2; scum in the air flotation machine 2 is discharged, and liquid enters an anaerobic tank 3;
biochemical treatment: the anaerobic tank 3 carries out anaerobic treatment on the liquid discharged by the air flotation machine 2, degrades most of substances which are difficult to degrade in the wastewater, then enters a three-phase separator of the anaerobic tank to carry out gas, solid and liquid three-phase separation, and the liquid obtained by separation is discharged into a primary sedimentation tank 4; the liquid discharged from the anaerobic tank 3 is subjected to mud-water separation in a primary sedimentation tank 4, and the separated liquid flows into a contact oxidation tank 5; the contact oxidation pond 5 further degrades organic matters, ammonia nitrogen and phosphorus in the inflowing liquid; the liquid treated by the contact oxidation tank 5 flows into a secondary sedimentation tank 6 for sludge-water separation;
and (3) disinfection treatment: and (3) the liquid in the secondary sedimentation tank 6 enters a disinfection system for disinfection treatment, and the liquid treated by the disinfection system flows into a clean water tank for farmland irrigation or other ways.
Examples
As shown in fig. 1, the device for treating wastewater from dairy farm cultivation in this embodiment comprises a stacking screw machine 1, an air flotation machine 2, an anaerobic tank 3, a primary sedimentation tank 4, a contact oxidation tank 5, a secondary sedimentation tank 6, a disinfection tank 7 and a clean water tank 8 which are connected in sequence with the outlet of a dry-wet separation rear water collection tank. The water outlet of the spiral shell stacking machine 1 enters an air floatation tank 2, and the solid separated by the spiral shell stacking machine 1 is used for composting; scum in the floatation tank 2 and sludge in the primary sedimentation tank 4 and the secondary sedimentation tank 6 are all sent into a sludge concentration tank 9, the sludge concentrated by the sludge concentration tank 9 is dehydrated by a sludge dehydrator 10, the solid dehydrated by the sludge dehydrator 10 is used for composting, and the liquid obtained by dehydration is returned to a raw water tank; the water inlets of the spiral shell stacking machine 1, the air flotation machine 2 and the sludge dewatering machine 10 are connected with a flocculating agent adding device 11 and a coagulating agent adding device 12, a flocculating agent in the flocculating agent adding device 11 and a coagulating agent in the coagulating agent adding device 12 are mixed according to a proportion, and mixed liquid enters the spiral shell stacking machine 1, the air flotation machine 2 and the sludge dewatering machine 10. The waste water in the disinfection tank 7 is disinfected by chlorine dioxide, a chlorine dioxide disinfector 14 is connected with the disinfection tank 7 by a pipeline, and the liquid disinfected by the disinfection tank 7 flows into the clean water tank 8. Wherein the air floating machine 2 adopts a concave-convex air floating machine (as shown in figure 2). The anaerobic tank 3 adopts a UASB anaerobic reactor. The sludge in the secondary sedimentation tank 6 flows back to the anaerobic tank 3 and the contact oxidation tank 5 through pipelines. One part of the sludge in the primary sedimentation tank 4 flows back to the anaerobic tank 3, and the other part is sent to a sludge concentration tank 9. The primary sedimentation tank 4 and the secondary sedimentation tank 6 adopt vertical flow sedimentation tanks. The sludge concentration tank 9 adopts a vertical flow sedimentation tank, and the supernatant liquid flows back to the raw water tank. The sludge dewatering machine 10 is a belt filter press, the dewatered sludge is used for composting, and the wastewater flows back to the raw water pool. The contact oxidation tank 5 is filled with filler and is connected with a blower 13.
The wastewater water taking point of the dairy farm breeding wastewater treatment device is the water outlet of the dry-wet separated water collecting tank, namely the screw folding machine 1 is connected with the water outlet of the dry-wet separated water collecting tank, and the water collecting tank adjusts the quality and quantity of wastewater. The wastewater treatment process of the dairy farm breeding wastewater treatment device comprises pretreatment, biochemical treatment and disinfection treatment.
Pretreatment: raw water flowing out of a water outlet of the water collecting tank after the dry-wet separation enters the spiral shell stacking machine 1, the spiral shell stacking machine 1 performs solid-liquid separation on mixed liquid obtained by mixing the raw water with the chemicals added by the flocculating agent dosing device 11 and the coagulant dosing device 12, and suspended matters with a large particle diameter ratio in the mixed liquid are removed. And (3) performing composting treatment on solid separated from liquid, enabling the liquid to enter a pit-concave air flotation machine, mixing the liquid with the medicaments added by a flocculating agent dosing device 11 and a coagulant dosing device 12 again, enabling the mixed liquid to enter an aeration chamber of the air flotation machine for aeration, then separating in a separation chamber, enabling scum to flow into a sludge concentration tank 9, removing most of the SS (suspended substances) in the wastewater after removing the fine suspended substances, and then enabling the wastewater to enter a UASB anaerobic reaction tank 3.
Biochemical treatment: the anaerobic reaction tank 3 is an up-flow anaerobic sludge bed reactor, the upper part is provided with a gas-solid-liquid three-phase separator, the lower part is a sludge area, waste water enters the anaerobic reaction tank 3 from the bottom and is decomposed into methane, water and carbon dioxide by anaerobic bacteria, then the waste water rises to the three-phase separator to realize the separation of gas, liquid and solid, and the liquid flows into the primary sedimentation tank 4. And (3) realizing sludge-water separation in the primary sedimentation tank 4, refluxing a part of separated sludge to the anaerobic tank 3, keeping the high sludge concentration of the anaerobic reaction tank 3, and discharging a part of separated sludge to a sludge concentration tank 9. The primary sedimentation tank 4 is a vertical flow sedimentation tank, supernatant flowing out of the overflow weir enters the contact oxidation tank 5, and the contact oxidation tank 5 is filled with filler, so that organic matters, ammonia nitrogen and phosphorus in wastewater can be degraded. The contact oxidation pond 5 is connected with a blast aeration system 13. The contact oxidation tank 5 is connected with a secondary sedimentation tank 6, the secondary sedimentation tank 6 is a vertical flow type sludge concentration tank, and the effluent of an overflow weir of the secondary sedimentation tank 6 enters a disinfection tank 7. The secondary sedimentation tank 6 is connected with the contact oxidation tank 5 and the anaerobic reaction tank 3, sludge in the secondary sedimentation tank 6 can flow back to the contact oxidation tank 5 and the anaerobic reaction tank 3, the sludge concentration and load of each treatment area are ensured, and nitrogen and phosphorus removal is carried out simultaneously.
And (3) disinfection treatment: the disinfection is carried out by adopting chlorine dioxide, and the disinfection tank 7 is connected with a chlorine dioxide generator 14. Because the livestock and poultry breeding wastewater contains a large amount of bacteria and viruses, disinfection treatment is required. The effluent of the disinfection tank 7 enters a clean water tank 8.
The invention has the following advantages:
1. according to different characteristics of the wastewater of the dairy farm and other breeding wastewater, the conventional wastewater pretreatment is generally dry-wet separation, only large-particle pollutants can be removed, and suspended matters in the wastewater have poor removal effect and directly enter a biochemical system to influence the effect of the biochemical system. This device sets up and folds spiral shell machine and air supporting device, and the raw water reduces suspended solid and organic matter content in the waste water through folding spiral shell machine, air supporting, alleviates follow-up anaerobic treatment's the degree of difficulty greatly.
2. The invention aims at the situation that the wastewater in a dairy farm contains higher fibrous suspended matters, and the common dissolved air flotation can cause easy blockage of a releaser, and the air flotation of the device adopts a concave-convex air flotation machine. The pit-concave air flotation machine has the characteristics of larger bubble diameter, wide size distribution, high scum solid content and easy maintenance, and is more suitable for the dairy farm wastewater containing high-fiber substances than the dissolved air flotation for general aquaculture wastewater.
3. The invention adopts a primary sedimentation tank behind the anaerobic tank, the primary sedimentation tank separates eliminated sludge and refractory SS brought out by the effluent of the anaerobic tank, one part of the separated sludge flows back to the anaerobic tank, one part of the separated sludge enters the sludge tank, and water enters the contact oxidation tank. This not only can alleviate the treatment load of the subsequent contact oxidation pond, but also can guarantee the high load and the high sludge concentration of the anaerobic pond.
4. The invention treats the cattle raising wastewater and the milking room wastewater in the dairy plant together, saves time and labor, treats the wastewater for recycling and field irrigation, treats the sludge for composting, saves energy, protects environment, recycles the wastewater, realizes zero discharge of the wastewater, and solves the problems of unstable wastewater treatment effect, long treatment period, incapability of stably reaching the standard and the like of the existing farm.
Claims (10)
1. A wastewater treatment system for dairy farm culture is characterized by comprising a spiral shell stacking machine (1), an air flotation machine (2), an anaerobic tank (3), a primary sedimentation tank (4), a contact oxidation tank (5), a secondary sedimentation tank (6) and a disinfection system, wherein a water outlet of the spiral shell stacking machine (1) is connected with a water inlet of the air flotation tank (2); the water outlet of the air floatation tank (2) is connected with the water inlet of the anaerobic tank (3), the water outlet of the anaerobic tank (3) is connected with the water inlet of the primary sedimentation tank (4), the water outlet of the primary sedimentation tank (4) is connected with the water inlet of the contact oxidation tank (5), the water outlet of the contact oxidation tank (5) is connected with the water inlet of the secondary sedimentation tank (6), and the water outlet of the secondary sedimentation tank (6) is connected with the water inlet of the disinfection system.
2. The dairy farm aquaculture wastewater treatment system according to claim 1, further comprising a flocculant adding device (11) and a coagulant adding device (12), wherein a water inlet of the spiral shell stacking machine (1) is connected with an outlet of the flocculant adding device (11) and an outlet of the coagulant adding device (12), and a water inlet of the air flotation machine (2) is connected with an outlet of the flocculant adding device (11) and an outlet of the coagulant adding device (12).
3. The dairy farm aquaculture wastewater treatment system according to claim 1, further comprising a vertical flow type sludge concentration tank (9) and a sludge dewatering machine (10), wherein a sludge inlet of the vertical flow type sludge concentration tank (9) is connected with a sludge discharge port of the air flotation machine (2), and a sludge outlet of the vertical flow type sludge concentration tank (9) is connected with a sludge inlet of the sludge dewatering machine (10).
4. The dairy farm aquaculture wastewater treatment system according to claim 1, further comprising a vertical flow type sludge concentration tank (9) and a sludge dewatering machine (10), wherein a sludge discharge port of the primary sedimentation tank (4) is divided into two paths, one path is connected with a sludge inlet of the vertical flow type sludge concentration tank (9), the other path is connected with the anaerobic tank (3), and a sludge outlet of the vertical flow type sludge concentration tank (9) is connected with a sludge inlet of the sludge dewatering machine (10).
5. The dairy farm aquaculture wastewater treatment system according to claim 1, further comprising a vertical flow type sludge concentration tank (9) and a sludge dewatering machine (10), wherein the sludge discharge port of the secondary sedimentation tank (6) is divided into three paths, one path is connected with the sludge inlet of the vertical flow type sludge concentration tank (9), the other path is connected with the anaerobic tank (3), the other path is connected with the contact oxidation tank (5), and the sludge outlet of the vertical flow type sludge concentration tank (9) is connected with the sludge inlet of the sludge dewatering machine (10).
6. The dairy farm aquaculture wastewater treatment system according to claim 3, 4 or 5, wherein an inlet of the screw stacking machine (1) is connected with an outlet of the dry-wet separation water collecting tank, a water outlet of the sludge dewatering machine (10) is connected to the inlet of the dry-wet separation water collecting tank, a water outlet of the vertical flow type sludge concentrating tank (9) is connected to the inlet of the dry-wet separation water collecting tank, and a water inlet of the sludge dewatering machine (10) is connected with a flocculant adding device (11) and a coagulant adding device (12).
7. The wastewater treatment system for dairy farm cultivation according to claim 1, wherein the contact oxidation pond (5) is filled with a filler, and the contact oxidation pond (5) is connected to the blast aeration system (13).
8. The dairy farm aquaculture wastewater treatment system according to claim 1, wherein the disinfection system comprises a disinfection tank (7) and a chlorine dioxide generator (14), the water inlet of the disinfection tank (7) is connected with the water outlet of the secondary sedimentation tank (6), and the disinfection tank (7) is connected with the chlorine dioxide generator (14).
9. The dairy farm aquaculture wastewater treatment system according to claim 8, characterized in that a clean water tank (8) is connected to the water outlet of the disinfection tank (7).
10. A method for treating wastewater from dairy farm cultivation, which is performed by the system for treating wastewater from dairy farm cultivation of any one of claims 1 to 9, comprising the steps of:
pretreatment: the raw water after the dry-wet separation enters a screw stacking machine (1), and the raw water, a flocculating agent and a coagulating agent are mixed in the screw stacking machine (1) for solid-liquid separation; mixing the liquid obtained by separation of the screw stacking machine (1) with a flocculating agent and a coagulant, and then feeding the mixture into an air flotation machine (2), wherein the liquid is subjected to slag-water separation in the air flotation machine (2); scum in the air floatation machine (2) is discharged, and liquid enters an anaerobic tank (3);
biochemical treatment: the anaerobic tank (3) carries out anaerobic treatment and gas-solid-liquid separation on the liquid discharged by the air flotation machine (2), and the liquid obtained by separation is discharged into the primary sedimentation tank (4); the liquid discharged from the anaerobic tank (3) is subjected to sludge-water separation in the primary sedimentation tank (4), and the separated liquid flows into the contact oxidation tank (5); the contact oxidation pond (5) degrades organic matters, ammonia nitrogen and phosphorus in the inflowing liquid; the liquid treated by the contact oxidation tank (5) flows into a secondary sedimentation tank (6) for mud-water separation;
and (3) disinfection treatment: and the liquid in the secondary sedimentation tank (6) enters a disinfection system for disinfection treatment, and the liquid treated by the disinfection system is discharged.
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| CN202011521738.4A CN112661354A (en) | 2020-12-21 | 2020-12-21 | System and method for treating breeding wastewater of dairy farm |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011521738.4A CN112661354A (en) | 2020-12-21 | 2020-12-21 | System and method for treating breeding wastewater of dairy farm |
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