CN110156164B

CN110156164B - Method for comprehensively utilizing hot spring wastewater and heat in multiple levels

Info

Publication number: CN110156164B
Application number: CN201810338202.5A
Authority: CN
Inventors: 李清源
Original assignee: Individual
Current assignee: Yunnan Mujiahe Biotechnology Co.,Ltd.
Priority date: 2018-04-16
Filing date: 2018-04-16
Publication date: 2021-09-10
Anticipated expiration: 2038-04-16
Also published as: CN110156164A

Abstract

The invention relates to a method for comprehensively utilizing hot spring wastewater and heat in multiple levels, wherein a comprehensive system for utilizing the hot spring wastewater and the heat in the multiple levels comprises four parts: the system comprises a hot spring swimming pool, a wastewater ecological treatment part, a bathing part and a spirulina culture part; wherein the hot spring swimming pool is connected with the hot spring waste water plate heat exchanger and then connected with the ecological treatment part of the swimming pool waste water; the swimming pool wastewater ecological treatment part comprises two sections; the bathing part comprises a bathing room, a boiler room and a bathing wastewater plate heat exchanger; the spirulina cultivating part consists of an spirulina pool, a stirrer, a temperature detector, a controller and a plate type radiator. The hot spring swimming pool waste water treated by the technical scheme has safe water quality when entering the fishpond, and meanwhile, the heat exchanger exchanges the heat of the hot spring waste water and the bathing waste water to be used for bathing and spirulina cultivation without directly contacting with the hot spring waste water and the bathing waste water through the plate heat exchanger, so that the energy consumption for bathing and spirulina cultivation is greatly reduced.

Description

Method for comprehensively utilizing hot spring wastewater and heat in multiple levels

Technical Field

The invention belongs to the technical field of hot spring water treatment and heat utilization, and particularly relates to a method for comprehensively utilizing hot spring wastewater and heat in a multi-level manner.

Background

The geothermal resources in China are very rich, geothermal hot springs are arranged in many areas, and after the hot springs are found locally, hot spring resort villages are generally built, so that huge economic benefits are brought. Because the hot spring vacation tourism industry can bring many benefits, hot spring waste water and heat are not effectively utilized and are wasted. Some places utilize hot spring water, and only dig bigger pits to use the cooled hot spring water for fish culture, but not all hot spring water can be cooled for fish culture, because most hot spring water contains sulfate and other mineral elements, and the pH value is also higher, which is unfavorable for the growth of fish and aquatic crops, generally, the untreated hot spring water can only culture high-tolerance fish species such as tilapia, but consumers generally reflect that fish flesh is bitter, and the market does not recognize hot spring fish.

In addition, because the hot spring water contains various mineral substances and is not suitable for being kept on the skin for a long time, tap water or common underground water is supplied to a bathing room for use after being heated by a boiler in the hot spring resort under the general condition. The hot spring swimming pool or the soaking pool requires to change water every day, and the discharged waste water is generally at the temperature

35-48 ℃. On the one hand, the hot spring waste water with heat is drained away, and on the other hand, 10 degrees of tap water or underground water needs to be heated, which undoubtedly increases the energy consumption cost of the hot spring resort.

As is known, the problem that algae are killed and rotten due to the fact that the temperature of an algae pond is too low is common in artificial culture of spirulina. The growth temperature of the spirulina is 22-45 ℃, the optimum temperature is 35-42 ℃, and if the water temperature is not well controlled, the spirulina body is easy to die. The existing common solution is to place a heater in water, but the problem is that the temperature of water around the heater is too high, which is not beneficial to the growth of algae and has larger energy consumption. The temperature of the hot spring water is kept at 35-48 ℃ throughout the year, and if the heat of the hot spring water can be converted for the spirulina culture, the energy consumption of the spirulina artificial culture can be greatly reduced.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provides a method for comprehensively utilizing hot spring wastewater and heat in multiple levels.

The invention relates to a method for comprehensively utilizing hot spring wastewater and heat in multiple levels, which establishes a comprehensive system for utilizing hot spring wastewater and heat in multiple levels, and comprises four parts: the system comprises a hot spring swimming pool, a wastewater ecological treatment part, a bathing part and a spirulina culture part; the hot spring swimming pool is connected with the hot spring waste water plate type heat exchanger through a drainage pipeline, and a waste water filter screen is arranged between the hot spring swimming pool and the hot spring waste water plate type heat exchanger; the hot spring wastewater plate heat exchanger is also connected with a water return channel and a hot spring end tap water outlet pipe, and is connected with the swimming pool wastewater ecological treatment part through a drainage pipeline; the ecological treatment part of the swimming pool wastewater is a long and narrow roundabout ecological treatment channel with the capacity reaching 5-10 times of the daily water discharge of the swimming pool, the ecological treatment channel is divided into two sections, the first section of the ecological treatment channel is a sandy soil gallery directly dug on the ground, and the two walls and the bottom of the ecological treatment channel are hardened; the second section of ecological treatment channel is a sandy soil tunnel directly excavated on the ground, the two walls and the bottom of the second section of ecological treatment channel are not hardened, and the two sections of ecological treatment channels are isolated by an isolation net; the tail end of the second section of ecological treatment channel is connected with the fishpond; a filter screen is arranged between the tail end of the second section of ecological treatment channel and the fishpond; the hot spring swimming pool and the fishpond have a gradient difference of 3-5 degrees; putting spirulina into the first section of ecological treatment channel water; aquatic plants are planted in the second section of ecological treatment channel water, and freshwater shrimps, freshwater mussels and rhodeus panying are put in; the depth of the first section of ecological treatment channel is 0.8-1.2 m, and the capacity is 2-4 times of the daily water discharge of the swimming pool; the depth of the second section of ecological treatment channel is 1.2-1.6 meters, and the capacity is 3-6 times of the daily water discharge of the swimming pool; the hot spring swimming pool waste water flows into the first section of ecological treatment channel after exchanging heat through the hot spring waste water plate type heat exchanger 4, flows into the second section of ecological treatment channel after being retained for 2-4 days, and flows into the fishpond after being retained for 3-6 days;

the bath part comprises a bath room, a boiler room and a bath wastewater plate heat exchanger, wherein the bath wastewater plate heat exchanger and a wastewater filter screen are arranged on a bath wastewater drainage channel of the bath room; the bath wastewater plate type heat exchanger is connected with a bath wastewater drainage channel, a bath wastewater outlet, a bath end tap water inlet pipe and a bath end tap water outlet pipe; the hot spring end tap water outlet pipe and the bath end tap water outlet pipe are converged into a boiler water inlet pipe and connected into a boiler room; a hot water pipe is led out from the boiler room and is connected into the bathing room; the bath wastewater outlet is connected with a drain outlet; the bath wastewater is discharged into a drain outlet after heat exchange through the bath wastewater plate heat exchanger; the tap water is extracted by the bath wastewater plate heat exchanger to extract heat, flows into the boiler room, is further heated by the boiler and is supplied to the bath room;

the spirulina cultivating part consists of an spirulina pool, a stirrer, a temperature detector, a controller and a plate type radiator, wherein a boiler room is connected with the plate type radiator at the bottom of the spirulina pool through a boiler water outlet channel; the controller is set to be in three stages, wherein the first stage is that when the temperature of the algae pond is lower than 35 ℃, a boiler heating mode is started; the second grade is that when the temperature of the algae pond is 35-42 ℃, a heat exchange circulation mode is started; the third grade is that when the temperature of the algae pond is higher than 42 ℃, the heat exchange circulation mode is closed.

Furthermore, the diameter of the meshes of the waste water filter screen is less than or equal to 5 mm.

Furthermore, a switchable sunlight plate is arranged above the algae pond.

Furthermore, a vacuum hot water boiler capable of supplying hot water with different temperatures is arranged in the boiler room and is respectively connected with pipelines of the bathing part and the spirulina cultivating part according to different temperature settings.

Furthermore, two common boilers are arranged in the boiler room, one common boiler is connected with a pipeline of the bathing part, and the other common boiler is connected with a pipeline of the spirulina cultivating part.

The invention has the following beneficial effects:

1. sectional type structure is convenient for ecological treatment hot spring swimming pool waste water: the ecological treatment channel is divided into two sections, the first section is shallow, the bottom and two walls are hardened, so that spirulina which grows best at about 35 ℃ can carry out biochemical treatment on warm waste water just discharged from the hot spring swimming pool, and the waste water is cooled; the bottom and the two walls of the second section are not hardened, so that microorganisms in soil can conveniently enter a water body, meanwhile, aquatic plants can be planted to cultivate aquatic animals which have low economic value and a purifying effect on the water body, such as shrimps, mussels, Rhodeus and the like, and under the combined action of the organisms, the multi-level ecological treatment on the waste water of the hot spring swimming pool can be realized; the second section is deeper than the first section and can form a siphon action to suck excessive sediment deposited in the first section into the second section for being used as food for aquatic animals or fertilizer for aquatic plants. The hot spring swimming pool waste water treated by the technical scheme has safe water quality when being discharged from the water outlet, and can be used for production activities such as fish culture and the like.

2. Low cost, simple maintenance and automatic operation: the technical scheme of the invention is that the design is needed only during construction, the drainage channel of the hot spring swimming pool wastewater is scientifically divided into two sections according to the topography, the spirulina, the aquatic plants and the animals are respectively put in the drainage channel, the drainage channel can automatically operate after being constructed, the effect is good, the actual cost expenditure is very low, the drainage channel can automatically operate particularly in the later period, the maintenance is simple, a landscape can be added for a hot spring resort, and even a project for fishing small fishes and shrimps can be added.

3. The heat of hot spring wastewater and bathing wastewater is fully utilized, and the energy consumption is reduced: the invention exchanges the heat of the hot spring wastewater and the bath wastewater into tap water or underground water for bathing through a plate heat exchanger, the temperature of circulating water after full heat energy exchange is about 35-48 ℃, the temperature of the tap water exchanging heat with the bath wastewater can reach about 30-35 ℃, the temperature after collection is about 33-45 ℃, the circulating water enters a boiler and then can be used for bathing only by being heated to 42-48 ℃, and the energy consumption can be saved by more than 60 percent compared with the energy consumption of directly heating water from about 15 ℃ to 42-48 ℃ by the boiler.

4. Low cost, simple maintenance and remarkable effect: the technical scheme of the invention only needs to plan and reasonably arrange the positions of the drainage channel, the water inlet pipe and other pipelines during construction, the water entering the boiler can be heated to 33-45 ℃ after the construction according to the usual working procedures, the effect is good, the actual reconstruction cost is very low, the maintenance is simple, and at least 60% of energy consumption for heating bath water can be saved for the hot spring resort.

5. The thermal spring water is used for providing heat for the spirulina culture pond: the invention converts the heat of the water flowing out of the thermal spring pool into heat for the algae pool through the plate heat exchanger and the plate radiator paved at the bottom of the algae pool. The temperature of the water flowing out of the thermal spring pool is 35-48 ℃, the temperature of the algae pool can be completely kept above 35 ℃ through heat exchange, and the energy consumption of artificial culture of the spirulina is greatly saved.

6. Adding a boiler for emergency: circulating water carrying hot spring heat flows out after passing through the boiler, the boiler can not be started under ordinary conditions, but when the temperature of hot spring water is not enough to provide the heat required by the algae pond, the boiler is started to ensure the heat supply of the algae pond.

7. Automatically monitoring the temperature of the algae pond: the temperature detector is arranged in the algae pond, the heat exchange circulation mode is started when the temperature of the algae pond is lower than a set value, the boiler heating mode is started to realize rapid temperature rise when the temperature of the algae pond is lower than a minimum set value, and the heat exchange circulation mode is closed when the temperature of the algae pond is higher than the set value.

8. Only the heat of the waste water is extracted, the hot spring water is not polluted, and the waste water after bathing is not polluted: the technical scheme only extracts the heat of the hot spring wastewater and the bath wastewater, does not directly contact with the hot spring wastewater and the bath wastewater, does not pollute the hot spring water and the bath wastewater, and each water channel respectively runs by and does not contact with each other, only mutually exchanges and utilizes the heat, thereby reducing the energy consumption of bathing and spirulina culture.

Drawings

The attached drawing is a plane schematic diagram of a comprehensive system for utilizing hot spring wastewater and heat in multiple levels

The reference numbers are as follows:

1. hot spring pools; 2. a bathing room; 3. a boiler room; 4. a hot spring wastewater plate heat exchanger; 5. a bath wastewater plate heat exchanger; 6. a waste water filter screen; 7. a water discharge pipeline; 8. a water return channel; 9. a tap water outlet pipe at the hot spring end; 10. an algae pond; 11. a bath wastewater drainage channel; 12. a tap water inlet pipe at the bathing end; 13. a bath wastewater outlet; 14. a tap water outlet pipe at the bathing end; 15. a sewage draining outlet; 16. a boiler water inlet pipe; 17. a hot water pipe; 18. a stirrer; 19. a temperature detector; 20. a first section of ecological treatment channel; 21. a second section of ecological treatment channel; 22. a fishpond; 23. an isolation net; 24. filtering with a screen; 25. a plate radiator; 26. a boiler water outlet channel; 27. controller

Detailed Description

The technical solutions of the present invention are further described below by specific examples, but the technical solutions of the present invention are not limited to the examples.

A method for comprehensively utilizing hot spring wastewater and heat in multiple levels is characterized in that a comprehensive system for utilizing hot spring wastewater and heat in multiple levels is established, and the comprehensive system comprises four parts: the system comprises a hot spring swimming pool 1, a wastewater ecological treatment part, a bathing part and a spirulina culture part; the hot spring swimming pool 1 is connected with a hot spring wastewater plate heat exchanger 4 through a drainage pipeline 7, a wastewater filter screen 6 is arranged between the hot spring swimming pool 1 and the hot spring wastewater plate heat exchanger 4, the hot spring wastewater plate heat exchanger 4 is also connected with a water return channel 8 and a hot spring end tap water outlet pipe 9, and the hot spring wastewater plate heat exchanger 4 is connected with a swimming pool wastewater ecological treatment part through a drainage pipeline; the ecological treatment part of the swimming pool wastewater is a long and narrow roundabout ecological treatment channel with the capacity reaching 5-10 times of the daily water discharge of the swimming pool, the ecological treatment channel is divided into two sections, the first section of the ecological treatment channel 20 is a sandy soil gallery directly dug on the ground, and the two walls and the bottom of the ecological treatment channel are hardened; the second section of ecological treatment channel 21 is a sandy soil tunnel directly excavated on the ground, the two walls and the bottom of the second section of ecological treatment channel are not hardened, and the two sections of ecological treatment channels are isolated by an isolation net 23; the tail end of the second section of ecological treatment channel 21 is connected with a fishpond 22; a filter screen 24 is arranged between the tail end of the second section of ecological treatment channel 21 and the fishpond 22; the hot spring swimming pool 1 and the fishpond 22 have a gradient difference of 3-5 degrees; putting spirulina into the first section of ecological treatment channel water; aquatic plants are planted in the second section of ecological treatment channel water, and freshwater shrimps, freshwater mussels and rhodeus panying are put in; the depth of the first section of ecological treatment channel is 0.8 m, and the capacity of the first section of ecological treatment channel is 2 times of the daily water discharge of the swimming pool; the depth of the second section of ecological treatment channel is 1.6 meters, and the capacity of the second section of ecological treatment channel is 4 times of the daily water discharge of the swimming pool; the hot spring swimming pool waste water flows into the first section of ecological treatment channel after exchanging heat through the hot spring waste water plate type heat exchanger 4, flows into the second section of ecological treatment channel after being retained for 2 days, and flows into the fishpond 22 after being retained for 4 days;

the bathing part comprises a bathing room 2, a boiler room 3 and a bathing wastewater plate heat exchanger 5, wherein the bathing wastewater plate heat exchanger 5 and a wastewater filter screen 6 are arranged on a bathing wastewater drainage channel 11 of the bathing room 2; the bath wastewater plate type heat exchanger 5 is connected with a bath wastewater drainage channel 11, a bath wastewater outlet 13, a bath end tap water inlet pipe 12 and a bath end tap water outlet pipe 14; the hot spring end tap water outlet pipe 9 and the bath end tap water outlet pipe 14 are converged into a boiler water inlet pipe 16 and connected to the boiler room 3; a hot water pipe 17 is led out from the boiler room 3 and is connected into the bathing room 2; the bathing wastewater outlet 13 is connected with a sewage discharge port 15; the bath wastewater is discharged into a sewage outlet after exchanging heat through the bath wastewater plate heat exchanger 5; the tap water is extracted by the bath wastewater plate heat exchanger 5 to heat and then flows into the boiler room 3, and is further heated by the boiler and then is supplied to the bath room 2;

the spirulina cultivating part consists of an algae pond 10, a stirrer 18, a temperature detector 19, a controller 27 and a plate type radiator 25, wherein the boiler room 3 is connected with the plate type radiator 25 at the bottom of the algae pond 10 through a boiler water outlet channel 26, the stirrer 18 is arranged in the center of the algae pond 10, the temperature detector 19 is arranged on the wall of the algae pond 10, the controller 27 is arranged on a boiler of the boiler room 3, the temperature detector 19 is wirelessly connected with the controller 27, and the plate type radiator 25 is connected with the hot spring wastewater plate type heat exchanger 4 through a water return channel 8; the controller is set to be in three stages, wherein the first stage is that when the temperature of the algae pond is lower than 35 ℃, a boiler heating mode is started; the second grade is that when the temperature of the algae pond is 35-42 ℃, a heat exchange circulation mode is started; the third grade is that when the temperature of the algae pond is higher than 42 ℃, the heat exchange circulation mode is closed.

Furthermore, the diameter of the meshes of the wastewater filter screen 6 is less than or equal to 5 mm.

Further, a switchable sunlight panel is arranged above the algae pond 10.

Further, a vacuum hot water boiler capable of supplying hot water at different temperatures is arranged in the boiler room 3 and is respectively connected with pipelines of the bathing part and the spirulina cultivating part according to different temperature settings.

The waste water of the daily hot spring swimming pool 1 is filtered by a waste water filter screen 6, and then enters a hot spring waste water plate type heat exchanger 4 through a drainage pipeline 7, the waste water is converged into a first section of ecological treatment channel 20 under the action of gradient after heat exchange, and the waste water contains a large amount of sulfate, mineral substances, human body dander cells, sweat urine and other components when discharged, because the two walls and the bottom of the first section of ecological treatment channel 20 are hardened, the waste water cannot permeate into the ground, but is subjected to biochemical reaction by spirulina originally stored in the channel, and the sulfate, the mineral substances, the nitrogen and other components in the sweat urine are consumed, so that an alga body is synthesized; under the action of the gradient, the wastewater slowly flows to push the stored water in the first ecological treatment channel 20 to flow to the second ecological treatment channel 21, the water flows into the second ecological treatment channel 21 along with spirulina bodies, unreacted human body dander cells, undigested sweat and urine and the like, and becomes safe water under the combined action of aquatic plants, river shrimps, mussels and rhodeus panying fish, and the safe water enters the fish pond 22 after being filtered by the filter screen 24.

The first section of ecological treatment channel is shallow and accords with the life habit of spirulina; the second section of ecological treatment channel is also shallow and accords with the life habits of aquatic plants and Rhodeus shrimp, but is deeper than the first section of ecological treatment channel, so that a siphon effect can be formed, excessive substances precipitated at the bottom of the first section of ecological treatment channel are sucked, and the substances are rich in organic matters and can be used as food for freshwater shrimps and freshwater mussels. The aquatic plants planted in the second section of ecological treatment channel improve the peripheral landscape of the hot spring, and freshwater mussels, shrimps and small fishes are cultured in water, so that a more interesting entertainment mode is provided for people on vacation in the hot spring.

When the hot spring wastewater enters the hot spring wastewater plate heat exchanger 4, the temperature is about 35-48 ℃, the hot spring wastewater is subjected to heat exchange with circulating water entering the hot spring wastewater plate heat exchanger 4 from the water return channel 8, and the circulating water heated to 35-48 ℃ enters the boiler water inlet pipe 16 through the hot spring end tap water outlet pipe 9 and enters the boiler room 3 for heating; meanwhile, the temperature of the used wastewater in the bathing room 2 is about 30-35 ℃, the wastewater flows out through a bathing wastewater drainage channel 11, hair impurities are filtered by a wastewater filter screen 6 and then enter a bathing wastewater plate heat exchanger 5 to exchange heat with tap water or underground water entering the bathing wastewater plate heat exchanger 5 from a bathing end tap water inlet pipe 12, and the cooled bathing wastewater is discharged into a sewage discharge outlet 15 through a bathing wastewater outlet 13; the tap water or underground water heated to 30-35 ℃ enters the boiler water inlet pipe 16 through the tap water outlet pipe 14 at the bathing end and enters the boiler room 3 for heating; the circulating water and tap water are collected in the boiler inlet pipe 16 at a temperature of about 33-45 c.

The boiler room is provided with a vacuum hot water boiler which can supply hot water with different temperatures and is respectively connected with pipelines of the bathing part and the spirulina cultivating part according to different temperature settings. When the water temperature rises to 42-48 ℃, the water is connected into the bathing room 2 through the hot water pipe 17.

The temperature detector 19 arranged on the wall of the algae pond of the spirulina cultivating part is wirelessly connected with the controller 27 arranged on the boiler, the controller 27 is set to be in three grades, and the first grade is that when the temperature of the algae pond is lower than 35 ℃, the boiler heating mode is started; the second grade is that when the temperature of the algae pond is 35-42 ℃, a heat exchange circulation mode is started; the third grade is that when the temperature of the algae pond is higher than 42 ℃, the heat exchange circulation mode is closed. When the temperature of the algae pond is 35-42 ℃, the heat exchange circulation mode is started, meanwhile, the boiler is stopped from heating, the circulating water carries the hot spring heat to enter the boiler 3 from the hot spring end plate type heat exchanger 4 and then directly enters the plate type radiator 25 laid at the bottom of the algae pond 10 through the boiler water outlet channel 26, the heat is dissipated to the whole algae pond under the stirring of the stirrer 18, the circulating water with the heat dissipated flows out of the algae pond water return channel 12 and enters the plate type heat exchanger 7 to obtain the heat again. When the temperature of the algae pond is higher than 42 ℃, closing the heat exchange circulation mode, and stopping the flow of circulating water; when the temperature of the algae pond is lower than 35 ℃, a boiler heating mode is started, circulating water carries hot spring heat to enter a boiler room 3 from a hot spring end plate type heat exchanger 4, the hot spring heat flows out after being heated by a boiler and enters a plate type radiator 25 laid at the bottom of the algae pond 10 through a boiler water outlet channel 26, the heat is radiated to the whole algae pond under the stirring of a stirrer 18, the circulating water with the heat being radiated flows out from an algae pond water return channel 8, the circulating water enters the hot spring end plate type heat exchanger 4 to obtain the heat again, and the circulating is continuously carried out until the temperature of the algae pond reaches 35-42 ℃.

The method for comprehensively utilizing hot spring wastewater and heat in multiple levels provided by the invention is described in detail above. The principles and embodiments of the present invention are explained herein in terms of specific embodiments, the foregoing description being merely included to assist in understanding the method and its core concepts of the present invention. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.

Claims

1. The method for comprehensively utilizing hot spring wastewater and heat in multiple levels is characterized in that a comprehensive system for utilizing hot spring wastewater and heat in multiple levels is established, and the comprehensive system comprises four parts: the system comprises a hot spring swimming pool (1), a wastewater ecological treatment part, a bathing part and a spirulina culture part; the hot spring swimming pool (1) is connected with a hot spring wastewater plate type heat exchanger (4) through a drainage pipeline (7), a wastewater filter screen is arranged between the hot spring swimming pool (1) and the hot spring wastewater plate type heat exchanger (4), the hot spring wastewater plate type heat exchanger (4) is also connected with a water return channel (8) and a hot spring end tap water outlet pipe (9), and the hot spring wastewater plate type heat exchanger (4) is connected with a swimming pool wastewater ecological treatment part through the drainage pipeline; the ecological treatment part of the swimming pool wastewater is a long and narrow roundabout ecological treatment channel with the capacity reaching 5-10 times of the daily water discharge of the swimming pool, the ecological treatment channel is divided into two sections, the first section of the ecological treatment channel (20) is a sandy soil gallery directly dug on the ground, and the two walls and the bottom of the ecological treatment channel are hardened; the second section of ecological treatment channel (21) is a sandy soil tunnel directly excavated on the ground, the two walls and the bottom of the second section of ecological treatment channel are not hardened, and the two sections of ecological treatment channels are isolated by an isolation net (23); the tail end of the second section of ecological treatment channel (21) is connected with a fishpond (22); a filter screen (24) is arranged between the tail end of the second section of ecological treatment channel (21) and the fishpond (22); the hot spring swimming pool (1) and the fishpond (22) have a gradient difference of 3-5 degrees; putting spirulina into the water in the first section of ecological treatment channel (20); aquatic plants are planted in the water of the second section of ecological treatment channel (21), and river shrimps, freshwater mussels and rhodeus PANG fish are put in; the depth of the first section of ecological treatment channel (20) is 0.8-1.2 m, and the capacity is 2-4 times of the daily water discharge of the swimming pool; the depth of the second section of ecological treatment channel (21) is 1.2-1.6 meters, and the capacity is 3-6 times of the daily water discharge of the swimming pool; the hot spring swimming pool waste water flows into a first section of ecological treatment channel (20) after exchanging heat through a hot spring waste water plate type heat exchanger (4), flows into a second section of ecological treatment channel (21) after being retained for 2-4 days, and flows into a fishpond (22) after being retained for 3-6 days;

the bathing part comprises a bathing room (2), a boiler room (3) and a bathing wastewater plate heat exchanger (5), wherein the bathing wastewater plate heat exchanger (5) and a wastewater filter screen are arranged on a bathing wastewater drainage channel (11) of the bathing room (2); the bath wastewater plate type heat exchanger (5) is connected with a bath wastewater drainage channel (11), a bath wastewater outlet (13), a bath end tap water inlet pipe (12) and a bath end tap water outlet pipe (14); the hot spring end tap water outlet pipe (9) and the bathing end tap water outlet pipe (14) are converged into a boiler water inlet pipe (16) and connected into a boiler room (3); a hot water pipe (17) is led out from the boiler room (3) and is connected into the bathing room (2); the bath wastewater outlet (13) is connected with a sewage outlet (15); the bath wastewater is discharged into a sewage outlet after exchanging heat through the bath wastewater plate heat exchanger (5); the tap water is extracted by the bathing wastewater plate heat exchanger (5) to heat and then flows into the boiler room (3), and is further heated by the boiler and then is supplied to the bathing room (2);

the spirulina cultivating part is composed of an algae pond (10), a stirrer (18), a temperature detector (19), a controller (27) and a plate type radiator (25), wherein a boiler room (3) is connected with the plate type radiator (25) at the bottom of the algae pond (10) through a boiler water outlet channel (26), the stirrer (18) is arranged in the center of the algae pond (10), the temperature detector (19) is arranged on the wall of the algae pond (10), the controller (27) is arranged on a boiler of the boiler room (3), the temperature detector (19) is wirelessly connected with the controller (27), and the plate type radiator (25) is connected with a hot spring wastewater plate type heat exchanger (4) through a water return channel (8); the controller is set to be in three stages, wherein the first stage is that when the temperature of the algae pond is lower than 35 ℃, a boiler heating mode is started; the second grade is that when the temperature of the algae pond is 35-42 ℃, a heat exchange circulation mode is started; the third grade is that when the temperature of the algae pond is higher than 42 ℃, the heat exchange circulation mode is closed.

2. The method for multi-level comprehensive utilization of hot spring wastewater and heat according to claim 1, wherein the diameter of the wastewater screen mesh is 5mm or less.

3. The method for multi-level comprehensive utilization of hot spring wastewater and heat as claimed in claim 1, wherein switchable sunlight panels are arranged above the algae ponds (10).

4. The method for multi-stage comprehensive utilization of hot spring wastewater and heat according to claim 1, wherein a vacuum hot water boiler capable of supplying hot water at different temperatures is installed in the boiler room (3) and is connected to the pipes of the bathing part and the spirulina cultivating part respectively according to different temperature settings.

5. The method for multi-level comprehensive utilization of hot spring wastewater and heat according to claim 1, characterized in that two common boilers are arranged in the boiler room (3), one is connected with a pipeline of a bathing part, and the other is connected with a pipeline of a spirulina culture part.