Novel milk factory wastewater treatment system

Abstract

The utility model belongs to the technical field of sewage treatment, and particularly relates to a novel milk factory wastewater treatment system. The wastewater treatment system comprises a grating, an adjusting tank, an air floatation tank, a hydrolysis acidification tank, an anoxic tank, a contact oxidation tank, a vertical flow sedimentation tank, a coagulative precipitation tank, a common rapid filter tank and a disinfection tank which are sequentially connected, the hydrolysis acidification tank, the vertical flow sedimentation tank, the coagulative precipitation tank and the common rapid filter tank are communicated with a sludge collecting well, and the sludge collecting well is sequentially communicated with a sludge concentration tank and a dehydration room. And the hydrolysis acidification pool is sequentially connected with a water-sealed tank, a buffer tank and a gas holder. The milk factory wastewater treatment system disclosed by the utility model has a good treatment effect on milk factory wastewater, and the effluent quality index meets the primary standard in Integrated Wastewater Discharge Standard. The whole process has the advantages of high high-concentration organic wastewater treatment efficiency, impact load resistance, difficulty in sludge bulking, low operation cost, good effluent quality, stable operation and low energy consumption, and is an economical and reasonable treatment system.

Description

Technical Field

[0001] This utility model belongs to the field of wastewater treatment technology, and in particular relates to a novel dairy wastewater treatment system. Background Technology

[0002] Currently, the main treatment methods for high-concentration organic wastewater in China include anaerobic biological treatment (such as UASB reactors and ABR methods), aerobic biological treatment (such as activated sludge processes and biofilm processes), physicochemical treatment (adsorption and coagulation sedimentation), and advanced oxidation methods (ozone oxidation and Fenton oxidation). Among these, biological treatment is the most in line with the concept of green development. Anaerobic biological treatment has advantages such as low energy consumption, high efficiency in removing large molecular organic matter, and low sludge production. It can also produce green energy substances and highly biodegradable materials, making it a feasible approach. However, when using anaerobic treatment alone to treat high-concentration organic wastewater, it is difficult for the effluent quality to meet the Class I standard of the "Integrated Wastewater Discharge Standard" (GB8978-1996). Furthermore, anaerobic biological reactors suffer from poor treatment effects, long reaction times, and low treatment efficiency for wastewater with excessively high suspended solids concentrations. Utility Model Content

[0003] This application addresses the shortcomings of existing methods by providing a novel dairy wastewater treatment system to solve the problems of poor effluent quality, long reaction time, and poor sludge stability in existing technologies.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] A novel dairy wastewater treatment system is provided, which, in the direction of wastewater inlet to outlet, is sequentially connected via water pipelines to a screen, equalization tank, dissolved air flotation tank, hydrolysis acidification tank, anoxic tank, contact oxidation tank, vertical flow sedimentation tank, coagulation sedimentation tank, ordinary rapid filter, and disinfection tank. The hydrolysis acidification tank and vertical flow sedimentation tank are connected to a sludge collection well via sludge pipelines, as are the coagulation sedimentation tank and ordinary rapid filter. The sludge collection well is sequentially connected to a sludge thickening tank and dewatering room via sludge pipelines. The hydrolysis acidification tank is sequentially connected to a water seal tank, buffer tank, and gas holder via gas pipelines.

[0006] The grille is a mechanical grille.

[0007] The flotation tank includes a reaction chamber, a separation chamber, and a contact chamber.

[0008] The hydrolysis acidification tank includes a reaction zone, a sedimentation zone, and a gas chamber.

[0009] The contact oxidation tank includes a reaction zone and a gas chamber.

[0010] The vertical flow sedimentation tank is connected to the hydrolysis acidification tank via a sludge return pipeline.

[0011] The sludge thickening tank, dewatering room, and ordinary rapid filter are connected to the equalization tank via a return pipeline.

[0012] The dehydration room is equipped with a belt filter press.

[0013] The coagulation sedimentation tank is connected to the dosing room via a dosing pipeline.

[0014] The sedimentation zone of the coagulation sedimentation tank adopts inclined tube sedimentation.

[0015] Compared with the prior art, the beneficial technical effects of this application are:

[0016] This novel high-efficiency dairy wastewater treatment system scientifically and precisely controls the process based on the concentration of organic pollutants in the influent and the reaction rate changes of activated sludge with different dominant bacterial species in each functional zone. Under the premise of scientific analysis, evaluation, design, or modification of the pretreatment section's water flow method, avoiding cascading reoxygenation or other inefficient aeration methods, the process can be flexibly adjusted to achieve efficient and stable removal of various pollutants even with high influent organic pollutant concentrations. This method is scientifically sound, simple to operate, and convenient to manage, making it fully applicable to large, medium, and small dairy wastewater treatment plants with high influent organic pollutant concentrations. It is the first practical application of a targeted and operable method to address this common industry challenge. Secondly, the effluent from this novel high-efficiency dairy wastewater treatment system includes a deep treatment unit, achieving reclaimed water standards. The extensive use of recycled water during production significantly reduces production costs, aligning with the concept of green and environmentally friendly development. Furthermore, it can be used to optimize and upgrade existing dairy wastewater treatment plants with complex pollutant compositions and high organic concentrations through simple process modifications and the addition of some facilities. It can also be directly applied to the process design of newly built dairy wastewater treatment plants with high influent organic pollutant concentrations. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the dairy wastewater treatment system in an embodiment of this utility model.

[0018] Figure 2 This is a structural diagram of the air flotation tank in the dairy wastewater treatment system of this utility model.

[0019] Figure 3 This is a structural diagram of the hydrolysis acidification tank in the dairy wastewater treatment system of this utility model.

[0020] Figure 4 This is a structural diagram of the contact oxidation tank in the dairy wastewater treatment system of this utility model.

[0021] Figure 5 This is a structural diagram of the coagulation sedimentation tank in the dairy wastewater treatment system of this utility model. Detailed Implementation

[0022] The principles and features of this utility model are described below with reference to the accompanying drawings. The examples given are only for explaining this utility model and are not intended to limit the scope of this utility model.

[0023] Now combined with the appendix Figure 1-5 The present invention will be further described in detail with reference to specific embodiments.

[0024] refer to Figure 1 As shown, a novel dairy wastewater treatment system includes, in sequence via water pipelines, a bar screen 1 (mechanical bar screen), an equalization tank 2 (hydraulic retention time of 6 hours), an air flotation tank 3 (pressurized dissolved air efficiency of 91%, contact chamber retention time of 166.67 seconds), a hydrolysis acidification tank 4 (hydraulic retention time of 4 hours, effective water depth of 4 meters, design water upward flow velocity of 1.125 m / h), an anoxic tank 5 (hydraulic retention time of 2 hours, effective water depth of 4 meters), and a contact oxidation tank 6 (filled with packing material). The system includes: a filling rate of 70%, an effective water depth of 4.5m, and bioceramic filler; a vertical flow sedimentation tank 7 (with a central pipe flow velocity of 25mm / s and a hydraulic retention time of 2.5h); a coagulation sedimentation tank 11 (using polyferric sulfate SPFS as the coagulant and a coagulation time of 30min); a conventional rapid filter 12 (with a backwashing time of 7min and a cycle of 24h); and a disinfection tank 13 (using a UV3000Plus ultraviolet disinfection lamp and a disinfection time of 30min).

[0025] The wastewater flow is as follows: Wastewater flows from the screen 1 (mainly treating suspended solids) into the inlet of the equalization tank 2 (regulating water quality and quantity). The outlet of the equalization tank 2 is connected to the inlet of the dissolved air flotation (DAF) tank 3 (removing most of the suspended solids). After entering the DAF tank 3 from the top, the wastewater passes through the reaction chamber, contact chamber, and separation chamber in sequence. The scum is then encapsulated by air bubbles and floats to the surface. The reaction chamber of the DAF tank 3 removes grease and colloidal impurities through the adhesion of air bubbles. The contact chamber of the DAF tank 3 mainly functions to form stable microbubbles. The separation chamber allows suspended solids to float to the surface using air bubbles as a carrier. In the separation process, the outlet of the dissolved air flotation tank 3 is connected to the inlet of the hydrolysis acidification tank 4 (which decomposes macromolecular organic matter to further improve the biodegradability of wastewater). The hydrolysis acidification tank 4 includes a reaction zone, a sedimentation zone, and an air chamber. Wastewater enters the reaction zone from the bottom of the hydrolysis acidification tank 4, enters through the inlet pipe, and is evenly distributed through the water distribution holes before entering the sedimentation zone. A biofilm packing material is used in the reactor to increase sludge stability. The outlet of the hydrolysis acidification tank 4 is connected to the inlet of the anoxic tank 5 (which removes nitrogen and phosphorus from the water and provides a good growth and metabolic environment for denitrifying bacteria). The outlet of the anoxic tank 5 is connected to the inlet of the contact oxidation tank 6 (which removes most pollutants from the water). The outlet of the contact oxidation tank 6 is connected to the inlet of the vertical flow sedimentation tank 7 (which settles and discharges sludge from the biologically treated wastewater). The outlet of the vertical flow sedimentation tank 7 is connected to the inlet of the coagulation sedimentation tank 11 (which further removes phosphorus from the water). The outlet of the coagulation sedimentation tank 11 is connected to the inlet of the ordinary rapid filter 12. The outlet of the ordinary rapid filter 12 is connected to the inlet of the disinfection tank 13.

[0026] The sludge discharged from the vertical flow sedimentation tank 7 is partially returned to the hydrolysis acidification tank 4.

[0027] The sludge thickening tank 9 (which reduces the moisture content of the sludge) is located below the sludge collection well 8. The sludge flow from the sludge collection well 8 comes from the hydrolysis acidification tank 4, the vertical flow sedimentation tank 7, the coagulation sedimentation tank 11, and the ordinary rapid filter tank 12 connected to it. When the sludge collection well 8 accumulates a certain amount of sludge, the sludge is discharged to the sludge thickening tank 9. The outlet of the sludge thickening tank 9 is connected to the inlet of the belt filter press in the dewatering room 10.

[0028] The supernatant from the sludge thickening tank 9 and the filtrate from the dewatering room 10 and the ordinary rapid filter 12 are returned to the equalization tank 2.

[0029] In this embodiment, the novel dairy wastewater treatment system first flows to the screen 1 after being collected, primarily to remove floating pollutants. Then, it enters the equalization tank 2, which regulates water quality and quantity. A wastewater lift pump within the equalization tank pumps the wastewater to the dissolved air flotation (DAF) tank 3. Water from the equalization tank 2 passes above the DAF tank 3 and enters the tank itself for further removal of suspended particulate matter. Water from the DAF tank 3 flows into the hydrolysis acidification tank 4, where it decomposes recalcitrant macromolecular organic matter, providing sufficient nutrients and an optimal environment for subsequent aerobic wastewater treatment. Water from the hydrolysis acidification tank 4 flows by gravity to the anoxic tank 5, where particulate matter is removed through sedimentation, reducing the concentration of organic matter. Water from the anoxic tank 5 then enters the contact oxidation tank 6 for aerobic treatment, removing remaining organic matter under aerobic conditions. The contact oxidation tank 6 includes a reaction zone and an air chamber. The reaction zone of the contact oxidation tank 6 is the main site for removing organic pollutants from the wastewater in this system, while the air chamber provides sufficient oxygen for the microorganisms in that area. The wastewater entering the reaction zone facilitates the decomposition of organic matter by these microorganisms.

[0030] The water exiting the contact oxidation tank 6 enters the vertical flow sedimentation tank 7, which serves as the sedimentation zone after treatment in the contact oxidation tank 6. After sedimentation in the vertical flow sedimentation tank 7, part of the sludge is discharged into the sludge collection well 8, and the other part is returned to the hydrolysis acidification tank 4, enabling the hydrolysis acidification tank 4 to maintain a high biomass. The disturbance generated by the rising water flow and biogas flow is sufficient to meet the stirring requirements, so the hydrolysis acidification tank 4 does not require a stirring device. Therefore, the hydrolysis acidification tank 4 has a relatively simple structure and is easy to operate and maintain.

[0031] The biogas produced by microorganisms in the anaerobic decomposition of organic matter in the hydrolysis acidification tank 4 is collected in the gas holder 17 after passing through the water seal tank 15 and buffer tank 16 connected to it.

[0032] Water from vertical flow sedimentation tank 7 enters coagulation sedimentation tank 11. The coagulant (SPFS) added to coagulation sedimentation tank 11 is supplied by the chemical dosing room 14. Inclined tube sedimentation is set in the sedimentation zone after the coagulation zone of coagulation sedimentation tank 11 to further separate phosphorus-containing sludge. Water from coagulation sedimentation tank 11 enters ordinary rapid filter 12. Water flowing out of ordinary rapid filter 12 enters disinfection tank 13. Disinfection tank 13 uses ultraviolet light for disinfection for 30 minutes. The effluent quality of disinfection tank 13 meets the standards.

[0033] Sludge collection well 8 collects sludge generated from hydrolysis acidification tank 4, vertical flow sedimentation tank 7, coagulation sedimentation tank 11, and ordinary rapid filter 12. This sludge is then concentrated in sludge thickening tank 9. The concentrated sludge is then filtered using a belt filter press in dewatering room 10 to form sludge cakes. These cakes are then transported off-site for proper disposal. The supernatant from sludge thickening tank 9, along with the filtrate from dewatering room 10 and ordinary rapid filter 12, is returned to equalization tank 2.

[0034] The dairy wastewater treatment system described in this invention has excellent treatment effect on dairy wastewater, and the effluent quality indicators meet the Class I standard of the "Integrated Wastewater Discharge Standard" (GB8978-1996). The entire process features high efficiency in treating high-concentration organic wastewater, resistance to shock loads, low risk of sludge bulking, low operating costs, good effluent quality, stable operation, and low energy consumption.

[0035] The above-described embodiments are merely preferred embodiments of the present invention, and their descriptions are relatively specific and detailed. The present invention can be implemented in many different forms and is not limited to the embodiments described in this specification. These embodiments are not intended as additional limitations on the content of the present invention; their purpose is to provide a more thorough and comprehensive understanding of the disclosure of the present invention. Furthermore, the above-described technical features can be combined with each other to form various embodiments not listed above, all of which are considered to be within the scope of this specification. Moreover, those skilled in the art can make improvements or modifications based on the above description, and all such improvements and modifications should fall within the protection scope of the appended claims.

Claims

1. A novel dairy wastewater treatment system, characterized in that, The wastewater is connected in sequence via water pipelines from inlet to outlet: screen (1), equalization tank (2), flotation tank (3), hydrolysis acidification tank (4), anoxic tank (5), contact oxidation tank (6), vertical flow sedimentation tank (7), coagulation sedimentation tank (11), ordinary rapid filter (12), and disinfection tank (13). The hydrolysis acidification tank (4) and vertical flow sedimentation tank (7) are connected to the sludge collection well (8) via sludge pipelines. The coagulation sedimentation tank (11) and ordinary rapid filter (12) are connected to the sludge collection well (8) via sludge pipelines. The sludge collection well (8) is connected in sequence via sludge pipelines to the sludge thickening tank (9) and dewatering room (10). The hydrolysis acidification tank (4) is connected in sequence via gas pipelines to the water seal tank (15), buffer tank (16), and gas holder (17).

2. The novel dairy wastewater treatment system according to claim 1, characterized in that, The grille (1) is a mechanical grille.

3. The novel dairy wastewater treatment system according to claim 1, characterized in that, The flotation tank (3) includes a reaction chamber, a separation chamber, and a contact chamber.

4. The novel dairy wastewater treatment system according to claim 1, characterized in that, The hydrolysis acidification tank (4) includes a reaction zone, a sedimentation zone, and a gas chamber.

5. A novel dairy wastewater treatment system according to claim 1, characterized in that, The contact oxidation tank (6) includes a reaction zone and a gas chamber.

6. The novel dairy wastewater treatment system according to claim 1, characterized in that, The vertical flow sedimentation tank (7) is connected to the hydrolysis acidification tank (4) through a sludge return pipeline.

7. The novel dairy wastewater treatment system according to claim 1, characterized in that, The sludge thickening tank (9), dewatering room (10), and ordinary rapid filter (12) are connected to the equalization tank (2) through a return pipeline.

8. The novel dairy wastewater treatment system according to claim 1, characterized in that, The dewatering room (10) is equipped with a belt filter press.

9. A novel dairy wastewater treatment system according to claim 1, characterized in that, The coagulation sedimentation tank (11) is connected to the dosing room (14) via a dosing pipeline.

10. A novel dairy wastewater treatment system according to claim 1, characterized in that, The sedimentation zone of the coagulation sedimentation tank (11) adopts inclined tube sedimentation.

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