Ecological toilet emission recycling treatment system and heat energy recycling method thereof

Abstract

The invention discloses an ecological toilet emission recycling treatment system and a heat energy recycling method thereof, and belongs to the technical field of sewage treatment. Biological fermentation and low-temperature evaporation processes are utilized, and solid waste and sewage generated by the ecological toilet are synchronously treated; by adopting a biological fermentation method, solid wastes such as feces and the like can be reduced and can be used as high-quality fertilizers after being simply treated, so that recycling of the solid wastes is realized; an evaporation method is adopted, so that the recovery rate of water resources is greatly improved, and waste of the water resources is hardly generated except a small part of evaporation loss; according to the invention, the unique heat exchange coil is arranged for heat recovery, heat generated in the material decomposition process by biological aerobic microorganisms in the fermentation tank is fully utilized for preheating sewage, and the power consumption of the low-temperature evaporator can be effectively reduced.

Description

Technical Field

[0001] The present invention belongs to the technical field of sewage treatment, and more specifically, relates to an ecological toilet discharge recycling treatment system and a heat energy recycling method thereof. Background Art

[0002] Ecological toilets are mainly divided into two types: circulating water flush toilets and water-free flush toilets. Among them, circulating water flush toilets mainly use physical and biochemical means to convert feces and urine produced by toilets into carbon dioxide and water, and reuse the circulating water for flushing toilets.

[0003] At present, the sewage treatment of common circulating water flush toilets on the market generally adopts membrane separation treatment process or activated sludge process. The membrane separation process refers to the process of applying pressure to selectively separate the solid and liquid through the membrane separation component after solid-liquid separation, and reusing the produced clean water for flushing the toilet. The water quality of the membrane separation process is good, and the operation and maintenance of the process is relatively automated, with low maintenance costs. However, the concentrated water and pollutants such as feces produced by membrane separation still need to be transported out for treatment, and the membrane components need to be regularly backwashed or replaced with drugs, and the impact resistance is also poor when the water quality fluctuates.

[0004] The activated sludge process is a process that combines pretreatment with a biological aeration tank to convert most of the organic matter in feces and urine into CO 2 and H 2 O, after subsequent treatment such as sedimentation, filtration, decolorization and sterilization, clean water is obtained and reused for flushing toilets. The activated sludge process uses microorganisms to degrade pollutants, and its energy consumption is relatively low and its operating cost is low. However, there is no process to remove salt from wastewater in the biological process. After repeated use of circulating water, pollutants and salts accumulate, leading to the collapse of the biological treatment system. This is also the limitation of the application of activated sludge process in circulating water flushing toilets. In addition, the activated sludge process also has no process to treat solid waste pollutants such as feces and sewage, and requires regular manual removal.

[0005] The existing ecological toilets' feces and sewage treatment systems are not optimized enough, the mixed fermentation treatment efficiency of feces is low, and the odor generated during the fermentation process affects the surrounding environment. The reuse rate of flushing water is low and regular replenishment is required. Traditional low-temperature evaporation devices consume a lot of power and are generally used to treat difficult wastewater, and are difficult to use in the field of ecological toilets. Summary of the invention

[0006] In view of the above problems existing in the prior art, the technical problem to be solved by the present invention is to provide an ecological toilet discharge recycling treatment system, which can simultaneously treat the solid waste and sewage generated by the ecological toilet through the process of biological fermentation and low-temperature evaporation, and has simple operation and low energy consumption. Another technical problem to be solved by the present invention is to provide a heat energy recycling method of the above recycling treatment system, which effectively reduces the power consumption of the low-temperature evaporator.

[0007] In order to solve the above technical problems, the technical solution adopted by the present invention is as follows:

[0008] An ecological toilet discharge recycling treatment system, including a septic tank, a regulating water tank, a raw material preparation tank, a fermentation tank, an electric heating low-temperature evaporator, a condenser, a recycling water tank, a salt filter tank, a vacuum scraper dryer and an activated carbon adsorption device;

[0009] The top of the septic tank is connected to the regulating water tank, the bottom of the septic tank is connected to the feed port of the raw material preparation tank through a peristaltic pump, the discharge port of the raw material preparation tank is connected to the top of the fermentation tank, one end of the regulating water tank is connected to the paddle-type heat exchange coil in the fermentation tank through a first lifting water pump, the gas outlet end of the fermentation tank is connected to the activated carbon adsorption device, and the water outlet of the paddle-type heat exchange coil in the fermentation tank is returned to the regulating water tank through a compression heat pump unit;

[0010] The other end of the regulating water tank is connected to the electric heating low temperature evaporator through the second lifting water pump, the electric heating low temperature evaporator is connected to the condenser and the salt filter tank respectively, the bottom of the condenser is connected to the recycled water tank, and the salt filter tank is connected to the vacuum scraper dryer.

[0011] Preferably, a stirrer composed of a spiral blade and a paddle blade is provided in the raw material preparation tank, and the material is horizontally transported to the stirring silo by the spiral blade;

[0012] The outside of the fermentation tank is provided with an insulation layer, and the bottom of the fermentation tank is also provided with a discharge trough and a leachate collecting trough, and the collected leachate flows back to the regulating water tank.

[0013] Preferably, the top of the condenser is connected to the gas-liquid separator via a first vacuum pump, and the vacuum scraper dryer is also connected to the gas-liquid separator via a buffer tank and a second vacuum pump in sequence.

[0014] A method for recycling and treating waste from an eco-toilet using the waste recycling and treatment system for an eco-toilet comprises the following steps:

[0015] S1: The discharge from the eco-toilet is passed into the septic tank for solid-liquid separation. The supernatant enters the regulating water tank through overflow, while the solids are transported to the raw material preparation tank through a peristaltic pump;

[0016] S2: fully mixing the separated feces solids with auxiliary materials, and adjusting the moisture content of the fermentation raw materials by adding the amount of auxiliary materials;

[0017] S3: After the fermentation raw materials are prepared in the raw material preparation tank, they enter the fermentation tank for biological fermentation. The odor generated by the fermentation is passed into the activated carbon adsorption device for adsorption. The heat energy generated by the biological fermentation is used to preheat the sewage in the regulating water tank and then return it to the regulating water tank;

[0018] S4: The hot water in the regulating water tank is lifted by the lifting pump to the electric heating low-temperature evaporator. The steam generated by the evaporator enters the condenser for condensation. The generated condensed water enters the recycling water tank for recycling and flushing toilets.

[0019] S5: The concentrated liquid produced by the low-temperature evaporator enters the salt filter tank for filtration, and the filtered mother liquor flows back to the low-temperature evaporator for evaporation. The salt mud precipitated in the salt filter tank enters the vacuum scraper dryer for drying and transportation.

[0020] Preferably, in step S2, the auxiliary materials are composed of straw, conditioners and biological agents; and the moisture content of the fermentation raw materials is adjusted to 50% to 60%.

[0021] Preferably, in step S3, the activated carbon adsorption device can adsorb more than 95% of odor pollutants.

[0022] Preferably, in step S3, the reaction cycle of the fermentation tank is 20 to 40 days, the filling factor of the fermentation tank is 0.5 to 0.75, and the oxygen content in the fermentation tank is controlled to be above 8%.

[0023] A method for recycling heat energy using the ecological toilet discharge recycling treatment system comprises the following steps:

[0024] 1) When the temperature of the material in the fermentation tank reaches above 60° C., the first lifting pump is started to draw cold water of the supernatant of the septic tank from the regulating water tank to the paddle-type heat exchange coil, and the stirring speed of the paddle-type heat exchange coil is controlled at the same time, so that the fermentation substrate in the fermentation tank and the paddle-type heat exchange coil are heat-transferred during the stirring process, and the bioheat energy is transferred to the cold water in the paddle-type heat exchange coil to obtain the preheated supernatant;

[0025] 2) The preheated supernatant enters the compression heat pump unit for heat exchange, and the heated supernatant flows back to the regulating water tank. When the temperature in the regulating water tank is preheated, the outlet water enters the electric heating low-temperature evaporator;

[0026] 3) The electric heater in the low-temperature evaporator is electrically heated to convert electrical energy into thermal energy, maintaining an appropriate vacuum degree and temperature, and evaporating the water out of the regulating water tank at a low temperature. The generated steam is cooled in the condenser, and the concentrated liquid generated by the low-temperature evaporator is filtered in the salt filter tank, and the precipitated salt mud is dried in the vacuum scraper dryer and transported;

[0027] 4) Collect and recycle the condenser cooling water into the recycling water tank for recycling and flushing toilets.

[0028] Compared with the prior art, the present invention has the following beneficial effects:

[0029] (1) Compared with the prior art, the present invention realizes the combined use of biological fermentation and low-temperature evaporation processes by setting a raw material preparation tank, a fermentation tank and an electrically heated low-temperature evaporator, and simultaneously treats the solid waste and sewage generated by the ecological toilet; wherein the moisture content of the fermentation raw material is controlled by adjusting the amount of auxiliary materials added in the raw material preparation tank, and then the raw material enters the fermentation tank for biological fermentation, thereby improving the efficiency of feces mixing treatment;

[0030] (2) The present invention also provides a ventilation pipe in the fermentation tank to pass the odor generated during biological fermentation into the activated carbon adsorption device for treatment, thereby reducing the impact of the odor of the ecological toilet on the surrounding environment;

[0031] (3) The present invention provides a raw material preparation tank and a fermentation tank for in-situ biological fermentation of feces and sewage generated by the ecological toilet, thereby reducing the amount of solid waste. The fermented feces and sewage can also be simply treated and used as high-quality fertilizer, thereby realizing the resource utilization of solid waste.

[0032] (4) The present invention first preheats the supernatant of the septic tank in the fermentation tank, and then preheats it for the second time through the compression heat pump unit before entering the electric heating low-temperature evaporator for low-temperature evaporation. It only needs to maintain the low power consumption of the electric heating low-temperature evaporator to keep warm, so that the supernatant preheated twice can be evaporated efficiently within a suitable evaporation range, greatly improving the recovery rate of water resources, and almost no waste of water resources is generated except for a small amount of evaporation loss;

[0033] (5) The present invention provides a salt filter tank and a low-temperature scraper dryer to filter the high-concentration kettle residual liquid produced by the low-temperature evaporator, and the salt mud produced is transported to the low-temperature scraper dryer through a pipeline pressure and then transported for treatment, thereby realizing the recycling of solid waste and sewage, while reducing the salt content of the sewage after multiple cycles, so that the biological fermentation system can continue to process efficiently;

[0034] (6) The present invention recovers heat by providing a unique paddle-type heat exchange coil. When the temperature of the material in the fermenter reaches above 60°C, the cold water in the regulating water tank enters the paddle-type heat exchange coil, and the stirring speed of the paddle-type heat exchange coil is controlled, so that the fermentation substrate in the fermenter and the paddle-type heat exchange coil transfer heat during the stirring process, and the biological heat energy is transferred to the cold water in the paddle-type heat exchange coil to achieve the purpose of preheating. The heat generated by the biological aerobic microorganisms in the fermenter during the decomposition of the material is fully utilized to preheat the sewage, which can effectively reduce the power consumption of the low-temperature evaporator. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 It is a structural schematic diagram of the ecological toilet discharge recycling treatment system of the present invention;

[0036] Figure 2The figure is a schematic flow chart of the method for recycling and treating the discharge from an ecological toilet according to the present invention;

[0037] Figure 3 It is a schematic diagram of the heat energy recycling process of the ecological toilet discharge recycling treatment system of the present invention;

[0038] The symbols and corresponding parts names in the attached figure are: 1-septic tank; 2-storage water tank; 3-peristaltic pump; 4.1-first lifting pump; 4.2-second lifting pump; 5-expansion valve; 6-raw material preparation tank; 6.1-feeding port; 6.2-spiral blade; 6.3-paddle blade; 6.4-mixing silo; 6.5-auxiliary material dosing device; 7-fermentation tank; 7.1-insulation layer; 7.2-paddle heat exchange coil; 7.3- Ventilation pipe; 7.4-discharge trough; 7.5-leachate collection trough; 7.6-air pump; 8-flow machine; 9-compression heat pump unit; 10-electric heating low-temperature evaporator; 11-condenser; 12-recycled water tank; 13-first vacuum pump; 14-gas-liquid separator; 15-second vacuum pump; 16-salt filter tank; 17-mother liquor pump; 18-vacuum scraper dryer; 19-buffer tank; 20-activated carbon adsorption device. DETAILED DESCRIPTION

[0039] In order to make the purpose, technical scheme and advantages of the present invention clearer, the present invention is further described below in conjunction with specific embodiments. In the following examples, unless otherwise specified, the technical means used are conventional means well known to those skilled in the art. If specific conditions are not specified in the examples, they are carried out according to conventional conditions or conditions recommended by the manufacturer. If the manufacturer is not specified for the reagents or instruments used, they are all conventional products that can be purchased commercially.

[0040] Example 1

[0041] The present invention provides a recycling treatment system for treating the discharge from an ecological toilet, the structure of which is as follows: Figure 1 As shown, it mainly includes: a septic tank 1, a regulating water tank 2, a raw material preparation tank 6, a fermentation tank 7, an electrically heated low-temperature evaporator 10, a condenser 11, a recycled water tank 12, a gas-liquid separator 14, a salt filter tank 16, a vacuum scraper dryer 18, a buffer tank 19, and an activated carbon adsorption device 20.

[0042] The top of the septic tank 1 is connected to the regulating water tank 2, and the bottom of the septic tank 1 is connected to the feed port 6.1 of the raw material preparation tank 6 through the peristaltic pump 3. A stirrer composed of a spiral blade 6.2 and a paddle blade 6.3 is arranged in the raw material preparation tank 6, and the material is horizontally transported to the stirring silo 6.4 through the spiral blade 6.2.

[0043] In some embodiments of the present invention, a temperature sensor, a humidity sensor and a pH sensor are provided in the mixing silo 6.4, and an external PLC control unit controls the auxiliary material adding device 6.5 according to the feedback signal in the mixing silo 6.4, automatically adds materials such as conditioners and straw, and automatically adjusts the parameters of the fermentation raw materials in the mixing silo 6.4.

[0044] The discharge port of the raw material preparation tank 6 is connected to the top of the fermentation tank 7. The outside of the fermentation tank 7 is provided with an insulation layer 7.1. The inside of the fermentation tank 7 is provided with a paddle heat exchange coil 7.2, a vent pipe 7.3, a discharge tank 7.4 and a leachate collection tank 7.5. The regulating water tank 2 is connected to the paddle heat exchange coil 7.2 in the fermentation tank 7 through the first lifting water pump 4.1 and the expansion valve 5. The fermentation tank 7 is connected to the activated carbon adsorption device 20 through the vent pipe 7.3. The water outlet of the paddle heat exchange coil 7.2 of the fermentation tank 7 is returned to the regulating water tank 2 through the compression heat pump unit 9. The discharge tank 7.4 and the leachate collection tank 7.5 are sequentially arranged at the bottom of the fermentation tank 7, and the leachate collected by the leachate collection tank 7.5 is returned to the regulating water tank 2.

[0045] In some embodiments of the present invention, a temperature and oxygen concentration sensor is also provided in the fermentation tank 7, and the first lifting water pump 4.1 and the air pump 7.6 are controlled by the feedback signal of the temperature sensor to ensure the stability of the temperature and oxygen content in the fermentation tank 7.

[0046] The regulating water tank 2 is connected to the electric heating low temperature evaporator 10 through the second lifting water pump 4.2. The electric heating low temperature evaporator 10 is connected to the condenser 11 and the salt filter tank 16 respectively, and the mother liquor filtered by the salt filter tank 16 is refluxed to the electric heating low temperature evaporator 10 through the mother liquor pump 17. The salt mud precipitated from the salt filter tank 16 enters the vacuum scraper dryer 18 for drying. The bottom of the condenser 11 is connected to the recycling water tank 12, and the top of the condenser 11 is connected to the gas-liquid separator 14 through the first vacuum pump 13. The vacuum scraper dryer 18 is also connected to the gas-liquid separator 14 through the buffer tank 19 and the second vacuum pump 15 in turn.

[0047] In some embodiments of the present invention, a temperature sensor and a liquid level sensor are provided in the regulating water tank 2. When the temperature and liquid level in the regulating water tank 2 reach the requirements of the electrically heated low-temperature evaporator 10, the hot water in the regulating water tank 2 is lifted to the electrically heated low-temperature evaporator 10 by the second lifting water pump 4.2.

[0048] The present invention also provides a method for recycling and treating the discharge from an ecological toilet, using the above-mentioned recycling and treatment system for treating the discharge from an ecological toilet for recycling and treating, as shown in the flow chart. Figure 2 As shown, the main steps are as follows:

[0049] S1: The discharge from the eco-toilet is discharged into the septic tank for preliminary solid-liquid separation. The supernatant enters the regulating water tank through overflow, while the solids are transported to the raw material preparation tank through a peristaltic pump;

[0050] S2: Setting up a raw material preparation tank, fully mixing the separated manure solids with auxiliary materials in a certain ratio, and adjusting the humidity, molecular weight and other parameters of the fermentation raw materials by adding conditioning agents, straw and other materials;

[0051] S3: After the fermentation raw materials are prepared in the raw material preparation tank, they enter the fermentation tank for biological fermentation. The odor generated by the fermentation is passed into the activated carbon adsorption device to adsorb more than 95% of the odor pollutants. The heat energy generated by the biological fermentation is used to preheat the sewage in the regulating water tank and then return it to the regulating water tank;

[0052] S4: The hot water in the regulating water tank is lifted by the lifting pump to the electric heating low-temperature evaporator. The steam generated by the evaporator enters the condenser for condensation. The generated condensed water enters the recycling water tank for recycling and flushing toilets.

[0053] S5: The concentrated liquid produced by the low-temperature evaporator enters the salt filter tank for filtration, and the filtered mother liquor flows back to the low-temperature evaporator for evaporation. The salt mud precipitated in the salt filter tank enters the vacuum scraper dryer for drying and transportation.

[0054] Example 2

[0055] A method for recycling waste using an eco-toilet waste recycling treatment system comprises the following steps:

[0056] S1: The discharge from the eco-toilet is discharged into the septic tank 1 for preliminary solid-liquid separation, the supernatant enters the regulating water tank 2 by overflow, and the solid matter is transported to the feed port 6.1 of the raw material preparation tank 6 by the peristaltic pump 3;

[0057] S2: The separated manure and auxiliary materials are mixed in a certain ratio, so that the moisture content of the mixed materials is controlled at 50% to 60%, and are horizontally transported to the mixing silo 6.4 through the spiral blade 6.2, and then the fermentation raw materials are fully mixed by the paddle blade 6.3 in the mixing silo 6.4. The auxiliary material adding device 6.5 is controlled according to the feedback signal in the mixing silo 6.4 to automatically add materials such as conditioners and straw, and automatically adjust the parameters of the fermentation raw materials in the mixing silo 6.4;

[0058] S3: After the fermentation raw materials are configured in the raw material preparation tank 6, they enter the fermentation tank 7 for biological fermentation. The regulating water tank 2 lifts water to the paddle-type heat exchange coil 7.2 in the fermentation tank 7 through the first lifting water pump 4.1, and heat exchange occurs with the materials in the fermentation tank 7, and the heat energy generated by the biological fermentation is used to preheat the sewage; the first lifting water pump 4.1 and the air pump 7.6 are controlled by the feedback signal of the temperature sensor set in the fermentation tank 7 to ensure the stability of the temperature and oxygen content in the fermentation tank 7. The odor generated by the fermentation tank 7 is connected to the activated carbon adsorption device 20 through the ventilation pipe 7.3 to remove the odor pollutants generated during the fermentation process; the water outlet of the paddle-type heat exchange coil 7.2 of the fermentation tank 7 is further heated by the compression heat pump unit 9, and then flows back to the regulating water tank 2; the leachate collected by the leachate collection tank 7.5 of the fermentation tank 7 can also flow back to the regulating water tank 2;

[0059] S4: The regulating water tank 2 is provided with a temperature sensor and a liquid level sensor. When the temperature and liquid level in the regulating water tank 2 reach the requirements of the electric heating low temperature evaporator 10, the hot water in the regulating water tank 2 is lifted to the electric heating low temperature evaporator 10 by the second lifting water pump 4.2. The steam generated by the electric heating low temperature evaporator 10 enters the condenser 11 for condensation, and the generated condensed water enters the reuse water tank 12 for recycling and flushing the toilet;

[0060] S5: The concentrated liquid produced by the electrically heated low-temperature evaporator 10 enters the salt filter tank 16 for filtration, and the filtered mother liquid is refluxed to the electrically heated low-temperature evaporator 10 through the mother liquid pump 17 for evaporation, and the salt mud precipitated from the salt filter tank 16 enters the vacuum scraper dryer 18 for drying and transportation.

[0061] Example 3

[0062] The specific recycling treatment method of Example 2 is used to reuse the discharge of an ecological toilet, comprising the following steps:

[0063] S1: According to the place of use of toilets and the number of squatting pits, the amount of sewage and feces that the ecological toilet needs to treat every day is calculated through quotas. According to the amount of feces produced every day, as well as the molecular weight, solid content, calorific value, carbon-nitrogen ratio, moisture content and other parameters of the feces, the amount of straw, conditioner and biological agent required to be added is calculated in proportion to control the moisture content of the prepared materials within 50% to 60%;

[0064] S2: According to the total mass and bulk density of the materials in S1 and the reaction cycle of the fermenter, the reaction cycle of the fermenter is generally 20 to 40 days. Calculate the total amount of materials in a single fermentation cycle and the total volume of the fermenter, and select the appropriate height-to-diameter ratio to determine the size of the fermenter. The filling factor of the fermenter is 0.5 to 0.75.

[0065] S3: Calculate the maximum aeration volume required for biological fermentation based on the molecular weight and reaction rate of the compost material. The oxygen content in the reactor should always be controlled above 8%, and select a suitable air pump model;

[0066] S4: According to the external environment temperature, the heat generated during the fermentation process and the thermal insulation performance of the fermentation tank, the thickness and material of the thermal insulation layer are calculated to ensure the temperature stability of the fermentation process; according to the size of the fermentation tank and the heat exchange requirements, the material, diameter, length and spacing of the heat exchange coil are determined through simulation calculation to achieve efficient heat exchange; the temperature, humidity, oxygen concentration and other parameters in the fermentation tank are monitored in real time through the PLC control unit, and the working status of the lifting water pump and the air pump are automatically adjusted according to the set values ​​to maintain the stability of the fermentation environment; according to the main components and concentration of the odor generated by the fermentation, the appropriate type and amount of activated carbon are selected; by calculating the flow rate and temperature of the sewage, the power and model of the lifting water pump are determined to achieve efficient exchange of heat energy between the sewage and the fermentation tank;

[0067] S5: Select evaporation equipment and supporting equipment with appropriate evaporation capacity according to the amount of sewage.

[0068] Example 4

[0069] The present invention also provides a method for recycling heat energy in an ecological toilet discharge recycling treatment system. Using the recycling treatment system in the above embodiment 1, the heat energy recycling process is as follows: Figure 3 As shown, the steps are as follows:

[0070] S1: When the temperature of the material in the fermentation tank 7 reaches above 60°C, the first lifting pump 4.1 is started to extract the supernatant (cold water) of the septic tank 1 from the regulating water tank 2 to the paddle-type heat exchange coil 7.2, and at the same time, the stirring speed of the paddle-type heat exchange coil 7.2 is controlled so that the fermentation substrate in the fermentation tank 7 and the paddle-type heat exchange coil 7.2 are heat-transferred during the stirring process, and the bioheat energy (Q1) is transferred to the cold water in the paddle-type heat exchange coil 7.2, so as to achieve the purpose of preheating;

[0071] S2: The preheated supernatant enters the heat pump unit, which converts electrical energy (Q2) into mechanical energy through the compressor motor, and then converts the mechanical energy into thermal energy, so that the coolant is heated; the coolant and the fermentation tank outlet water (preheated supernatant) are heated in the hot water exchanger (Q4), and the heat energy of the heated coolant is transferred to the fermentation tank outlet water. The exchanged coolant goes to the air heat exchanger, absorbs the heat energy in the air (Q3), and then circulates to the compressor for work heating; the fermentation tank outlet water flows back to the hot water storage tank, and when the temperature in the regulating water storage tank 2 is preheated, the outlet water enters the electrically heated low-temperature evaporator 10;

[0072] S3: An electric heater is set in the electric heating low-temperature evaporator 10 to convert electric energy (Q5) into heat energy. By setting the electric heating low-temperature evaporator 10, it maintains an appropriate vacuum degree and temperature to maintain an efficient, low-power low-temperature evaporation reaction. The generated steam enters the condenser 11 for cooling, and the generated concentrated liquid enters the salt filter tank 16 for filtration. The salt mud precipitated from the salt filter tank 16 enters the vacuum scraper dryer 18 for drying. The dried salt mud is white granular salt particles. The sewage is recycled for multiple times, and the salt production is less than 1kg / m 3 ;

[0073] S4: The cooling water from the condenser 11 is collected and recycled into the recycling water tank 12 for circulating and flushing toilets.

[0074] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. An ecological toilet discharge recycling treatment system, characterized in that: It comprises a septic tank (1), a regulating water tank (2), a raw material preparation tank (6), a fermentation tank (7), an electrically heated low-temperature evaporator (10), a condenser (11), a recycled water tank (12), a salt filter tank (16), a vacuum scraper dryer (18) and an activated carbon adsorption device (20); The top of the septic tank (1) is connected to the regulating water tank (2), the bottom of the septic tank (1) is connected to the feed port (6.1) of the raw material preparation tank (6) through a peristaltic pump (3), the discharge port of the raw material preparation tank (6) is connected to the top of the fermentation tank (7), one end of the regulating water tank (2) is connected to the paddle-type heat exchange coil (7.2) in the fermentation tank (7) through a first lifting water pump (4.1), the gas outlet end of the fermentation tank (7) is connected to the activated carbon adsorption device (20), and the water outlet of the paddle-type heat exchange coil (7.2) in the fermentation tank (7) is returned to the regulating water tank (2) through a compression heat pump unit (9); The other end of the regulating water tank (2) is connected to the electrically heated low-temperature evaporator (10) through a second lifting water pump (4.2), and the electrically heated low-temperature evaporator (10) is respectively connected to the condenser (11) and the salt filter tank (16), the bottom of the condenser (11) is connected to the recycled water tank (12), and the salt filter tank (16) is connected to the vacuum scraper dryer (18).

2. The ecological toilet discharge recycling treatment system according to claim 1 is characterized in that: The raw material preparation tank (6) is provided with a stirrer composed of a spiral blade (6.2) and a paddle blade (6.3), and the material is horizontally transported to the stirring silo (6.4) through the spiral blade (6.2); The fermentation tank (7) is provided with an insulation layer (7.1) on the outside, and a discharge trough (7.4) and a leachate collection trough (7.5) are also provided at the bottom of the fermentation tank (7), and the collected leachate flows back to the regulating water tank (2).

3. The ecological toilet discharge recycling treatment system according to claim 1 is characterized in that: The top of the condenser (11) is connected to the gas-liquid separator (14) via a first vacuum pump (13), and the vacuum scraper dryer (18) is also connected to the gas-liquid separator (14) via a buffer tank (19) and a second vacuum pump (15) in sequence.

4. A method for recycling and treating waste from an ecological toilet using the waste recycling and treating system for ecological toilets according to any one of claims 1 to 3, characterized in that: The following steps are involved: S1: The discharge from the eco-toilet is passed into the septic tank for solid-liquid separation. The supernatant enters the regulating water tank through overflow, while the solids are transported to the raw material preparation tank through a peristaltic pump; S2: fully mixing the separated feces solids with auxiliary materials, and adjusting the moisture content of the fermentation raw materials by adding the amount of auxiliary materials; S3: After the fermentation raw materials are prepared in the raw material preparation tank, they enter the fermentation tank for biological fermentation. The odor generated by the fermentation is passed into the activated carbon adsorption device for adsorption. The heat energy generated by the biological fermentation is used to preheat the sewage in the regulating water tank and then return it to the regulating water tank; S4: The hot water in the regulating water tank is lifted by the lifting pump to the electric heating low-temperature evaporator. The steam generated by the evaporator enters the condenser for condensation. The generated condensed water enters the recycling water tank for recycling and flushing toilets. S5: The concentrated liquid produced by the low-temperature evaporator enters the salt filter tank for filtration, and the filtered mother liquor flows back to the low-temperature evaporator for evaporation. The salt mud precipitated in the salt filter tank enters the vacuum scraper dryer for drying and transportation.

5. The method for recycling and treating waste from an ecological toilet according to claim 4, characterized in that: In step S2, the auxiliary materials are composed of straw, conditioner and biological bacteria agent; the moisture content of the fermentation raw materials is adjusted to 50% to 60%.

6. The method for recycling and treating waste from an ecological toilet according to claim 4, characterized in that: In step S3, the activated carbon adsorption device can adsorb more than 95% of odor pollutants.

7. The method for recycling and treating waste from an ecological toilet according to claim 4, characterized in that: In step S3, the reaction cycle of the fermentation tank is 20 to 40 days, the filling factor of the fermentation tank is 0.5 to 0.75, and the oxygen content in the fermentation tank is controlled to be above 8%.

8. A method for recycling heat energy using the ecological toilet waste recycling treatment system according to claim 1, characterized in that: The following steps are involved: 1) When the temperature of the material in the fermentation tank (7) reaches above 60° C., the first lifting pump (4.1) is started to draw cold water of the supernatant liquid of the septic tank (1) from the regulating water tank (2) to the paddle-type heat exchange coil (7.2), and at the same time, the stirring speed of the paddle-type heat exchange coil (7.2) is controlled so that the fermentation substrate in the fermentation tank (7) and the paddle-type heat exchange coil (7.2) transfer heat during the stirring process, and the bioheat energy is transferred to the cold water in the paddle-type heat exchange coil (7.2), thereby obtaining a preheated supernatant liquid; 2) The preheated supernatant enters the compression heat pump unit (9) to undergo heat exchange, and the heated supernatant flows back into the regulating water tank (2). When the temperature in the regulating water tank (2) is preheated, the outlet water enters the electrically heated low-temperature evaporator (10); 3) The electric heater in the electrically heated low-temperature evaporator (10) is used to convert the electric energy into heat energy, and the appropriate vacuum degree and temperature are maintained to evaporate the water from the regulating water storage tank (2) at a low temperature. The generated steam is cooled in the condenser (11). The concentrated liquid generated by the electrically heated low-temperature evaporator (10) is filtered in the salt filter tank (16). The precipitated salt mud is dried in the vacuum scraper dryer (18) and then transported away. 4) The cooling water of the condenser (11) is collected and recycled into the recycling water tank (12) for recycling to flush the toilet.

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