Cold region aerobic fermentation and sewage treatment combined integrated device

Abstract

A cold region aerobic fermentation and sewage treatment combined integrated device comprises a feeding system (1), the tail end of the feeding system (1) is connected with a fermentation tank body (2), the feeding system (1) comprises a spiral conveyor (33), materials crushed by a crusher are conveyed into the fermentation tank body (2) through the spiral conveyor (33), a stirring shaft (3) is arranged in the middle of the fermentation tank body (2), and the stirring shaft (3) is connected with the spiral conveyor (33). Blades (31) are arranged on the lower portion of the stirring shaft (3), a motor (32) is arranged on the upper portion of the stirring shaft (3), the motor (32) is fixedly connected with the top of the fermentation tank body (2) and drives the stirring shaft (3) to rotate, a ventilation pipeline (4) is arranged on the right side of the fermentation tank body (2) and penetrates into the fermentation tank body (2), and a thermometer (5) is arranged on the left side of the fermentation tank body (2).

Description

Technical Field

[0001] This utility model relates to the fields of wastewater treatment and fermentation energy recovery and utilization, and in particular to an integrated device for combining aerobic fermentation and wastewater treatment in cold regions. Background Technology

[0002] In the cold season in Northeast China, sewage treatment faces the problem of low influent temperature affecting microbial activity and resulting in low treatment efficiency. Some integrated sewage treatment equipment in townships will install heating in the equipment room to increase the temperature inside the reactor. This method will increase the consumption of energy and electricity resources. Moreover, the disposal of agricultural waste such as straw will cause some unnecessary heat waste. The existing methods do not address both problems at the same time, which has drawbacks. Summary of the Invention

[0003] This invention addresses the aforementioned shortcomings of existing technologies by providing an integrated device combining aerobic fermentation and wastewater treatment in cold regions. This device utilizes a heat collection coil to directly absorb residual heat from the fermenter, thereby maintaining high activity of microorganisms and enabling them to decompose organic pollutants in wastewater more quickly. This improves the efficiency and quality of wastewater treatment and allows for the proper disposal of agricultural waste. It solves the problems of low influent temperature for wastewater treatment and waste in agricultural waste disposal during the cold season in Northeast China.

[0004] The objective of this utility model is achieved through the following technical solution:

[0005] An integrated device combining aerobic fermentation and wastewater treatment in cold regions includes a feeding system connected to a fermentation tank. The feeding system includes a screw conveyor, through which crushed material is conveyed to the fermentation tank. A stirring shaft is located in the middle of the fermentation tank, with blades at its lower part and a motor at its upper part. The motor is fixedly connected to the top of the fermentation tank and drives the stirring shaft to rotate. A ventilation duct is located on the right side of the fermentation tank, extending into the tank. A thermometer is located on the left side of the fermentation tank. A discharge valve is located at the bottom right side of the fermentation tank. A filtrate discharge pipe is located at the bottom of the fermentation tank, containing a filter screen and a control valve. A coil sleeve is located on the outer wall of the stirring shaft, with a heat collection coil wound around its outer surface. The heat collection coil is fixedly connected to the fermentation tank and passes through the tank to connect to a shell-and-tube heat exchanger.

[0006] The shell-and-tube heat exchanger is connected to the inlet pipe and return pipe of the integrated sewage treatment equipment through a heating coil. The heating coil is wrapped around the outer wall of the inlet pipe and return pipe of the integrated sewage treatment equipment. The outer side of the heating coil is covered with a pipe insulation layer, and a PPR sleeve is installed on the outer side of the pipe insulation layer.

[0007] The shell-and-tube heat exchanger comprises a baffle, a heat exchange tube and a shell, the shell is internally provided with symmetrical baffles, two baffles divide the shell-and-tube heat exchanger into a left cabin, a heat exchange cabin and a right cabin from left to right, the upper part of the left cabin is connected with a first water inlet, the lower part of the left cabin is connected with a first water outlet, the middle part of the left cabin is provided with a water-proof layer, the heat exchange cabin is internally provided with a baffle, the middle part of the heat exchange cabin is provided with a heat exchange tube, the two sides of the heat exchange tube are connected with the baffles and respectively extend from the baffles, the top of the heat exchange cabin is provided with a second water inlet, and the bottom of the heat exchange cabin is provided with a second water outlet. Beneficial effects

[0008] In the prior art, in view of the low-temperature condition faced by the integrated sewage treatment equipment in the cold season in the northeast and the high cost of agricultural waste transportation and disposal, the present application finally selects to add agricultural waste and sludge powder into an aerobic fermentation tank for crushing treatment, to produce heat through the addition of an ultrahigh-temperature bacterial agent, and to collect the fermentation residual heat to heat the integrated sewage treatment equipment. In view of the above problems, the present application designs a new heat exchange layout. The heat collecting coil is arranged to directly absorb the residual heat in the fermentation tank. The coil sleeve is arranged between the stirring shaft and the blade. During the operation of the stirring shaft and the blade, the heat collecting coil does not rotate with them, which greatly reduces the interference with the operation of the stirring shaft and the blade. In addition, the heating coil is arranged to heat the water flow in the pipeline at the same time of water inlet and backflow. Through the shell-and-tube heat exchanger, the collected high-temperature fluid completes the heat exchange process, and the heating coil is provided with fluid at a suitable temperature, so that the microorganisms in the reactor have high activity.

[0009] Guaranteeing the activity of microorganisms, in the process of sewage treatment, microorganisms play a key role. The activated sludge method is a common method for sewage treatment, which contains a large number of bacteria, fungi and other microorganisms. These microorganisms can effectively decompose organic matter in sewage within a suitable temperature range. In the cold northeast, the air temperature is often lower than the optimum temperature required for the growth of microorganisms. The present application can maintain a high activity of microorganisms. When the activity of microorganisms is guaranteed, they can decompose organic pollutants in sewage more quickly, thereby improving the efficiency and quality of sewage treatment and ensuring that the sewage meets the discharge standard. In addition, the aerobic fermentation of the present application can convert agricultural waste into organic fertilizer. Wheat straw, corn straw and other waste contain a large amount of organic matter, nitrogen, phosphorus, potassium and other nutrients. Through aerobic fermentation, the organic matter in these wastes is decomposed and transformed under the action of microorganisms, and finally forms organic fertilizer rich in humus. This organic fertilizer can be re-applied to agricultural production to improve soil structure. This method conforms to the rural energy development strategy under the background of carbon neutralization. On the one hand, it reduces the resource consumption generated by heating the integrated sewage treatment equipment. On the other hand, it solves the problem of agricultural waste nearby through aerobic composting, thereby reducing the treatment cost. BRIEF DESCRIPTION OF DRAWINGS

[0010] Figure 1 The utility model discloses a kind of integrated device structure schematic diagram of cold region aerobic fermentation and sewage treatment combination.

[0011] Figure 2 The utility model discloses a kind of integrated device fermentation tank body structure sectional view of cold region aerobic fermentation and sewage treatment combination.

[0012] Figure 3 The utility model discloses a kind of integrated device tube-shell heat exchanger structure sectional view of cold region aerobic fermentation and sewage treatment combination.

[0013] Figure 4 The utility model discloses a kind of heating coil, return pipe connection structure schematic diagram. Specific implementation

[0014] The utility model will be further detailed as follows according to the drawings and examples:

[0015] Example 1:

[0016] A kind of integrated device of cold region aerobic fermentation and sewage treatment combination, including feeding system 1, the tail end of the feeding system 1 is connected fermentation tank body 2, the feeding system 1 includes screw conveyor 33, the material of pulverizer crushing is transported to fermentation tank body 2 by screw conveyor 33, fermentation tank body 2 middle is equipped with stirring shaft 3, the lower portion of the stirring shaft 3 is provided with blade 31, the upper portion of the stirring shaft 3 is provided with motor 32, motor 32 is fixedly connected with the top of fermentation tank body 2, motor 32 drives stirring shaft 3 rotation, the right side of the fermentation tank body 2 is equipped with ventilation duct 4, ventilation duct 4 is in-depth fermentation tank body 2, the left side of the fermentation tank body 2 is equipped with thermometer 5, the right side bottom of the fermentation tank body 2 is equipped with discharge valve 8, the bottom of the fermentation tank body 2 is equipped with filtrate exclusion pipe 9, the inside of the filtrate exclusion pipe 9 is provided with filter screen 35, the filtrate exclusion pipe 9 is equipped with control valve, the outer wall of the stirring shaft 3 is equipped with coil sleeve 7, the outside of the coil sleeve 7 is wound and fixed heat collection coil 6, the heat collection coil 6 is fixedly connected with fermentation tank body 2 and passes through fermentation tank body 2 and connects tube-shell heat exchanger 10;

[0017] The tube-shell heat exchanger 10 is connected with the water inlet pipe and return pipe 34 of integrated sewage treatment equipment 16 by heating coil 13, the outer wall of the water inlet pipe and return pipe 34 of integrated sewage treatment equipment 16 is wound heating coil 13, the outside of the heating coil 13 is covered with pipeline thermal layer 14, the outside of the pipeline thermal layer 14 is provided with PPR sleeve pipe 15;

[0018] The shell-and-tube heat exchanger 10 includes a baffle 11, heat exchange tubes 12, and a shell 18. The shell 18 has symmetrically arranged partitions 19, which divide the shell-and-tube heat exchanger 10 from left to right into a left compartment 20, a heat exchange compartment 21, and a right compartment 22. The upper part of the left compartment 20 is connected to a first water inlet 23, and the lower part of the left compartment 20 is connected to a first water outlet 24. A water-proof layer 27 is provided in the middle of the left compartment 20. The heat exchange compartment 21 has a baffle 11 inside, and a heat exchange tube 12 is arranged in the middle of the heat exchange compartment 21. 2. Two partitions 19 are connected to each other and extend from the partitions 19 respectively. A second water inlet 25 is provided at the top of the heat exchange chamber 21, and a second water outlet 26 is provided at the bottom of the heat exchange chamber 21. One end of the heat collection coil 6 is connected to the second water inlet 25 through a pipe, and the other end is connected to the second water outlet 26 through a pipe. One end of the heating coil 13 is connected to the first water inlet 23 through a pipe, and the other end is connected to the first water outlet 24 through a pipe. The pipe insulation layer 14 is made of polyurethane, and the outside of the pipe insulation layer 14 is protected by a PPR sleeve 15. The fermentation tank 2 adopts a double-layer structure, and the inner wall is made of 304 stainless steel. The heat collection coil 6, which is wound around the surface of the coil sleeve 7 set on the outside of the stirring shaft 3, collects fermentation heat, completes heat exchange through the shell-and-tube heat exchanger 10, and delivers it to the heating coil 13, which is wound around the surface of the inlet pipe and return pipe 34 of the integrated sewage treatment equipment 16, to complete the regulation of water temperature.

[0019] Example 2:

[0020] like Figure 2 As shown, the fermentation tank 2 is used to receive the mixture of agricultural waste and sludge from the feeding system 1. It is uniformly mixed by the stirring shaft 3, so that the air in the ventilation duct 4 can fully contact the fermentation substrate. Under the action of the ultra-high temperature aerobic fermentation agent, the fluid in the heat collection coil 6 is heated.

[0021] like Figure 3 As shown, the shell-and-tube heat exchanger 10 is used to receive hot water from the heat collection coil 6 through the second inlet 25. The heat transfer effect is improved by the internal baffle 11 and the water is used by the heating coil 13. The water returns to the fermentation tank 2 from the second outlet 26. Cold water from the integrated sewage treatment equipment 16 enters from the first inlet 23 at the top of the left compartment 20, passes through the upper heat exchange tube 12, enters the right compartment 22, and then returns to the left compartment 20 through the lower heat exchange tube 12. The water undergoes sufficient heat exchange through the heat exchange tube 12 and finally flows out from the first outlet 24. The water is then transported to the heating coil 13 wrapped around the surface of the inlet and return pipes of the integrated sewage treatment equipment 16. The heating coil 13 uses a water pump to transport the water and regulate the water temperature.

[0022] like Figure 4As shown, the outer part of the heating coil 13 is covered by a pipeline thermal insulation layer 14, which is used to prevent heat loss during the heating of sewage, and a PPR sleeve 15 is used to protect the pipeline thermal insulation layer 14 from damage.

[0023] Example 3

[0024] The utility model relates a kind of integrated device of cold region aerobic fermentation and sewage treatment union, including feeding system 1, the feeding system 1 includes screw conveyor, the tail end of the feeding system 1 is connected fermentation tank body 2, the fermentation tank body 2 can adopt double-layer structure, inner wall is 304 stainless steel material, fermentation tank body 2 middle is equipped with stirring shaft 3, the right side of the fermentation tank body 2 is equipped with ventilation pipeline 4, left side is equipped with thermometer 5, the right side bottom of the fermentation tank body 2 is equipped with discharge valve 8, the bottom of the fermentation tank body 2 is equipped with filter screen and filtrate removal pipe 9, the outer wall of the stirring shaft 3 is equipped with coil sleeve 7, and there is gap between the outer wall of stirring shaft 3 and the inner wall of coil sleeve 7, the outer part of the coil sleeve 7 is wound and fixed heat collection coil 6, the rear end of the heat collection coil 6 is connected with shell-and-tube heat exchanger 10, water pump can be arranged between heat collection coil 6 and shell-and-tube heat exchanger 10, to accelerate flow heat exchange, the inside of the shell-and-tube heat exchanger 10 is equipped with baffle 11 and heat exchange pipe 12, the shell-and-tube heat exchanger 10 is connected integrated sewage treatment equipment 16, the outer wall of the water inlet pipe and return pipe of the integrated sewage treatment equipment 16 is wound heating coil 13, the outer side of the heating coil 13 is covered with pipeline thermal insulation layer 14, the outer side of the thermal insulation material is protected by PPR sleeve 15, fermentation heat is collected by heat collection coil 6 wound on the surface of coil sleeve 7 outside stirring shaft 3, heat exchange is completed by shell-and-tube heat exchanger 10, is transported to the water inlet pipe and return pipe surface wound heating coil 13 of integrated sewage treatment equipment 16, and the water flow is transported by water pump, to complete the regulation of water temperature.

[0025] Straw, rice husk and other agricultural wastes are mixed with sludge at a ratio of 4:1, added to fermentation tank body 2 and added with 1.8% of the mixture of ultra-high temperature bacteria agent for aerobic fermentation, the mixture is mechanically stirred by stirring shaft 3, the high temperature generated during fermentation is collected by heat collection coil 6 laid outside the stirring shaft to heat the fluid in the heat collection coil 6, the heat flow is transported into shell-and-tube heat exchanger 10 for heat exchange, the temperature in the pipe is adjusted to a suitable temperature, and then transported to the heating coil 13 laid on the outer wall of the water inlet pipe and return pipe of the integrated sewage treatment equipment, the pipeline is heated by the heating coil 13 to adapt to the activity of microorganisms, improve the effect of sewage treatment in cold season, the fluid enters shell-and-tube heat exchanger 10 through the tail end of the coil, and then enters fermentation tank body 2 again for circulation, the fermented material generates organic fertilizer, which is removed from the bottom of fermentation tank body 2 for standby as fertilizer.

[0026] Example 4:

[0027] The heat collecting coil 6, the tube-in-shell heat exchanger 10 and the heating coil 13 provided by the method, by adding the super high temperature aerobic fermentation inoculum into the fermentation tank 2, the temperature of the heap body rapidly rises to above 80 DEG C, and lasts for 5-7 days, water is injected into the heat collecting coil 6, the heating coil 13 and the tube-in-shell heat exchanger 10, the high temperature generated in the fermentation tank 2 heats the heat collecting coil 6 so that the water temperature in the pipe rises, the heat exchange cycle is carried out through the flow of water, the water after absorbing heat enters the tube-in-shell heat exchanger 10, the hot flow flows through the inner baffle 11, the cold flow flows in the heat exchange pipe 12, and the temperature regulation is completed in the tube-in-shell heat exchanger 10, the heating coil 13 is wound on the outer wall of the water inlet pipe and the return pipe of the integrated sewage treatment equipment 16, the water temperature in the pipe is appropriately heated through heat transfer, and after heating is completed, the water flow in the heating coil 13 enters the tube-in-shell heat exchanger 10 again to carry out heat exchange cycle. The heat exchange method is characterized in that the heat exchange principle is based on the basic formula of heat transfer The heat collecting coil 6 and the heating coil 13 adopt stainless steel pipes with a diameter of 20 mm and a spacing of 30 mm, the heating coil 13 is in an outdoor exposed state, and a pipeline heat preservation layer 14 is additionally arranged on the surface of the heating coil 13 to reduce heat loss; the PPR sleeve 15 is attached to the outside of the pipeline heat preservation layer 14 to protect the pipeline heat preservation layer 14 from being damaged, and the temperature of the reaction is controlled to enable the microorganisms to grow under suitable temperature conditions.

[0028] The above only describes preferred embodiments of the present application and is not used to limit the present application, and it should be pointed out that, for ordinary skilled persons in the technical field, some improvements and modifications can be made without departing from the technical principles of the present application, and these improvements and modifications should also be regarded as the protection scope of the present application.

Claims

1. An integrated device of aerobic fermentation in cold region and sewage treatment, characterized in that :Including feeding system (1), the tail end of the feeding system (1) is connected with fermentation tank (2), the feeding system (1) includes screw conveyor (33), the material crushed by the crusher is transported into fermentation tank (2) by screw conveyor (33), stirring shaft (3) is arranged in the middle of fermentation tank (2), blade (31) is arranged at the lower part of stirring shaft (3), motor (32) is arranged at the upper part of stirring shaft (3), motor (32) is fixedly connected with the top of fermentation tank (2), motor (32) drives stirring shaft (3) to rotate, ventilation duct (4) is arranged at the right side of fermentation tank (2), ventilation duct (4) penetrates into fermentation tank (2), thermometer (5) is arranged at the left side of fermentation tank (2), discharge valve (8) is arranged at the right bottom of fermentation tank (2), filter liquid discharge pipe (9) is arranged at the bottom of fermentation tank (2), filter screen (35) is arranged in filter liquid discharge pipe (9), control valve is arranged on filter liquid discharge pipe (9), coil sleeve (7) is arranged on the outer wall of stirring shaft (3), heat collecting coil (6) is wound and fixed on the outside of coil sleeve (7), heat collecting coil (6) is fixedly connected with fermentation tank (2) and penetrates through fermentation tank (2) to connect shell-and-tube heat exchanger (10).

2. The integrated device of claim 1, characterized in that :Shell-and-tube heat exchanger (10) is connected with the water inlet pipe and return pipe (34) of integrated sewage treatment equipment (16) through heating coil (13), the outer wall of the water inlet pipe and return pipe (34) of integrated sewage treatment equipment (16) is wound with heating coil (13), pipeline thermal insulation layer (14) is covered on the outside of heating coil (13), PPR sleeve (15) is arranged on the outside of pipeline thermal insulation layer (14).

3. The integrated device of claim 2, wherein the integrated device is characterized in that :Shell-and-tube heat exchanger (10) includes baffle (11), heat exchange pipe (12) and shell (18), the inside of shell (18) is symmetrically provided with partition (19), two partition (19) divide shell-and-tube heat exchanger (10) into left cabin (20), heat exchange cabin (21) and right cabin (22) from left to right, first water inlet (23) is connected with the upper part of left cabin (20), first water outlet (24) is connected with the lower part of left cabin (20), water barrier (27) is arranged in the middle of left cabin (20), baffle (11) is arranged in heat exchange cabin (21), heat exchange pipe (12) is arranged in the middle of heat exchange cabin (21), heat exchange pipe (12) is connected with partition (19) on both sides and respectively extends from partition (19).

4. The integrated device of claim 3, characterized in that :Second water inlet (25) is arranged on the top of heat exchange cabin (21), second water outlet (26) is arranged on the bottom of heat exchange cabin (21), one end of heat collecting coil (6) is connected with second water inlet (25) through pipeline, the other end of heat collecting coil (6) is connected with second water outlet (26) through pipeline, one end of heating coil (13) is connected with first water inlet (23) through pipeline, the other end of heating coil (13) is connected with first water outlet (24) through pipeline.

5. The integrated device of claim 2, wherein the integrated device is characterized in that :Pipeline thermal insulation layer (14) is made of polyurethane.

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