Ecological toilet waste recycling treatment system and heat energy recycling method

Abstract

The present invention discloses an eco-toilet waste recycling and treatment system and a heat energy recycling method thereof, belonging to the technical field of sewage treatment. The present invention utilizes biological fermentation and low-temperature evaporation processes to simultaneously treat solid waste and sewage generated by eco-toilets. The biological fermentation method employed can reduce the amount of solid waste, such as feces, and after simple treatment, it can be used as high-quality fertilizer, thus realizing the resource utilization of solid waste. The evaporation method employed greatly improves the water resource recovery rate, with virtually no water waste except for a small amount of evaporation loss. The present invention utilizes a unique heat exchange coil for heat recovery, fully utilizing the heat generated during the decomposition of materials by aerobic microorganisms within the fermentation tank to preheat sewage, effectively reducing the power consumption of the low-temperature evaporator.

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: recirculating water flush toilets and waterless flush toilets. Recirculating water flush toilets mainly use physical and biochemical means to convert feces and urine produced by the toilet into carbon dioxide and water, and reuse the recycled water for flushing.

[0003] Currently, wastewater treatment for recirculating flush toilets commonly used on the market generally utilizes membrane separation or activated sludge processes. Membrane separation involves selective separation of solids and liquids through membrane separation modules under pressure, with the resulting clean water then recycled for flushing. While membrane separation provides excellent effluent quality and relatively automated operation and maintenance, maintenance costs are low. However, the concentrated water and pollutants such as feces produced by membrane separation still need to be transported for treatment, and the membrane modules require regular backwashing or replacement. Furthermore, the membrane modules are less resilient to shocks caused by water quality fluctuations.

[0004] The activated sludge process uses a combination of pretreatment and biological aeration tanks, utilizing aerobic microorganisms in the aeration tanks to convert most of the organic matter in feces and urine into CO2 and H2O. After subsequent treatments such as sedimentation, filtration, decolorization, and sterilization, clean water is obtained and reused for toilet flushing. The activated sludge process uses microorganisms to degrade pollutants, resulting in relatively low energy consumption and operating costs. However, the biological process lacks a process for removing salt from the wastewater. Repeated use of the recycled water leads to the accumulation of pollutants and salt, causing the biological treatment system to collapse. This is also a limitation of the activated sludge process in recirculating water flush toilets. Furthermore, the activated sludge process also lacks a process for treating solid waste pollutants such as feces and sewage, requiring regular manual removal.

[0005] The existing ecological toilets' 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 requires regular replenishment. 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 response to the aforementioned problems with the existing technology, the present invention aims to provide an eco-toilet waste recycling and treatment system. This system uses a combination of bio-fermentation and low-temperature evaporation to simultaneously treat both solid waste and sewage generated by eco-toilets, offering simple operation and low energy consumption. Another technical problem addressed by the present invention is a method for recycling heat energy from the recycling and treatment system, effectively reducing the power consumption of the low-temperature evaporator.

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

[0008] An ecological toilet waste recycling and treatment system, comprising a septic tank, a regulating water tank, a raw material preparation tank, a fermentation tank, an electrically heated 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 via 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 via 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 via 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, the raw material preparation tank is provided with a stirrer consisting of a spiral blade and a paddle blade, 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 further 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 ecological toilet using the waste recycling and treatment system for an ecological 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 manure solids with auxiliary materials, and adjusting the moisture content of the fermentation raw materials by adding the 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 reuse water tank for recycling and flushing.

[0019] S5: The concentrated liquid produced by the low-temperature evaporator enters the salt filter tank for filtration. The filtered mother liquor is returned 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 waste 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 pump the supernatant cold water from the septic tank from the regulating water tank to the paddle heat exchange coil. At the same time, the stirring speed of the paddle heat exchange coil is controlled so that the fermentation substrate in the fermentation tank and the paddle heat exchange coil undergo heat transfer during the stirring process, transferring the bioheat energy to the cold water in the paddle heat exchange coil to obtain preheated supernatant;

[0025] 2) The preheated supernatant enters the compression heat pump unit for heat exchange. 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 electrically heated low-temperature evaporator converts electrical energy into thermal energy, maintains appropriate vacuum and temperature, and evaporates the water out of the regulating water tank at low temperature. The generated steam is cooled in the condenser, and the concentrated liquid generated by the electrically heated low-temperature evaporator enters the salt filter tank for filtration. The precipitated salt mud enters the vacuum scraper dryer for drying and removal;

[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 existing technology, 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 materials is controlled by adjusting the amount of auxiliary materials added to the raw material preparation tank, and then the raw materials are fed into 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 combines a raw material preparation tank with a fermentation tank to perform in-situ biological fermentation on the feces and sewage generated by the ecological toilet, thereby reducing the amount of solid waste. The fermented feces and sewage can also be simply processed 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 for the first time, then preheats it for the second time through the compression heat pump unit and then enters 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 it warm, so that the supernatant of the second preheating can be evaporated efficiently within the appropriate evaporation range, greatly improving the recovery rate of water resources. Except for a small amount of evaporation loss, almost no water resources are wasted;

[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. The salt mud produced is transported to the low-temperature scraper dryer through a pipeline pressure and then transported for treatment. This realizes the recycling of solid waste and sewage, while reducing the salt content of the sewage after multiple cycles of treatment, and enables the biological fermentation system to continuously and efficiently process.

[0034] (6) The present invention recovers heat by setting up a unique paddle-type heat exchange coil. When the temperature of the material in the fermentation tank 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 fermentation tank 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 fermentation tank 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 This is a schematic structural diagram of the ecological toilet waste recycling and treatment system of the present invention;

[0036] Figure 2Schematic diagram of the process of the present invention for the reuse and treatment of waste from an ecological toilet;

[0037] Figure 3 This is a schematic diagram of the heat energy recycling process of the ecological toilet waste 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 tank; 7.6-air pump; 8-flow meter; 9-compression heat pump unit; 10-electrically heated 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 solutions and advantages of the present invention clearer, the present invention will be further described below in conjunction with specific examples. In the following examples, unless otherwise specified, the technical means used are conventional means well known to those skilled in the art. In the examples, if specific conditions are not specified, they are carried out according to conventional conditions or the conditions recommended by the manufacturer. The reagents or instruments used are not specified by the manufacturer, and are all conventional products that can be purchased commercially. Example 1

[0040] The present invention provides a recycling treatment system for treating waste from ecological toilets, 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 electric heating 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.

[0041] 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 via a peristaltic pump 3. The raw material preparation tank 6 is equipped with an agitator consisting of a spiral blade 6.2 and a paddle blade 6.3. The material is horizontally transported to the mixing silo 6.4 by the spiral blade 6.2.

[0042] 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. 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.

[0043] The discharge port of the raw material preparation tank 6 is connected to the top of the fermentation tank 7. The fermentation tank 7 is equipped with an insulation layer 7.1 on the outside. Inside, a paddle-type heat exchange coil 7.2, a vent pipe 7.3, a discharge trough 7.4, and a leachate collection tank 7.5 are installed. The regulating water tank 2 is connected to the paddle-type heat exchange coil 7.2 inside the fermentation tank 7 via a first lift pump 4.1 and an expansion valve 5. The fermentation tank 7 is connected to the activated carbon adsorption device 20 via a vent pipe 7.3. The water discharged from the paddle-type heat exchange coil 7.2 of the fermentation tank 7 flows back to the regulating water tank 2 through a compression heat pump unit 9. The discharge trough 7.4 and leachate collection tank 7.5 are sequentially located at the bottom of the fermentation tank 7. The leachate collected in the leachate collection tank 7.5 flows back to the regulating water tank 2.

[0044] In some embodiments of the present invention, a temperature and oxygen concentration sensor is further provided in the fermentation tank 7, and the feedback signal of the temperature sensor is linked to control the first lifting water pump 4.1 and the air pump 7.6 to ensure the stability of the temperature and oxygen content in the fermentation tank 7.

[0045] The regulating water storage tank 2 is connected to the electrically heated low-temperature evaporator 10 via a second lift pump 4.2. The electrically heated low-temperature evaporator 10 is connected to a condenser 11 and a salt filter tank 16. The mother liquor filtered in the salt filter tank 16 is returned to the electrically heated low-temperature evaporator 10 via a mother liquor pump 17. The salt sludge precipitated from the salt filter tank 16 enters a vacuum scraper dryer 18 for drying. The bottom of the condenser 11 is connected to a recycled water tank 12, and the top of the condenser 11 is connected to a gas-liquid separator 14 via a first vacuum pump 13. The vacuum scraper dryer 18 is further connected to the gas-liquid separator 14 via a buffer tank 19 and a second vacuum pump 15.

[0046] 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.

[0047] The present invention also provides a method for recycling and treating waste from an ecological toilet, using the above-mentioned recycling and treatment system for treating waste from an ecological toilet for recycling treatment. The flow chart is as follows: Figure 2 As shown, the main steps are as follows:

[0048] 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;

[0049] S2: Set up a raw material preparation tank to fully mix the separated manure solids with auxiliary materials in a certain ratio, and adjust the humidity, molecular weight and other parameters of the fermentation raw materials by adding conditioning agents, straw and other materials;

[0050] 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;

[0051] 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 reuse water tank for recycling and flushing.

[0052] S5: The concentrated liquid produced by the low-temperature evaporator enters the salt filter tank for filtration. The filtered mother liquor is returned 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. Example 2

[0053] A method for recycling waste using an eco-toilet waste recycling and treatment system comprises the following steps:

[0054] S1: The discharge from the eco-toilet is discharged into the septic tank 1 for preliminary solid-liquid separation. The supernatant flows into the regulating water tank 2 through overflow, while the solids are transported to the feed port 6.1 of the raw material preparation tank 6 through the peristaltic pump 3;

[0055] 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%-60%. The mixed materials are then horizontally transported to the mixing silo 6.4 by spiral blades 6.2. The fermentation materials are then fully stirred by paddle blades 6.3 inside the mixing silo 6.4. The auxiliary material dosing device 6.5 is controlled based on the feedback signal from the mixing silo 6.4 to automatically add materials such as conditioning agents and straw, and automatically adjust the parameters of the fermentation materials in the mixing silo 6.4.

[0056] S3: After the fermentation raw materials are prepared in the raw material preparation tank 6, they enter the fermentation tank 7 for biological fermentation. The regulating water tank 2 uses the first lifting water pump 4.1 to lift water to the paddle-type heat exchange coil 7.2 in the fermentation tank 7, where 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 wastewater. The first lifting water pump 4.1 and the air pump 7.6 are controlled in a coordinated manner based on the feedback signal of the temperature sensor provided 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 vent pipe 7.3 to remove odor pollutants generated during the fermentation process. The water outlet from 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 returned to the regulating water tank 2. The leachate collected in the leachate collection tank 7.5 of the fermentation tank 7 can also be returned to the regulating water tank 2.

[0057] S4: The regulating water tank 2 is equipped 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 electrically heated low-temperature evaporator 10, the hot water in the regulating water tank 2 is pumped to the electrically heated low-temperature evaporator 10 by the second lifting water pump 4.2. The steam generated by the electrically heated low-temperature evaporator 10 enters the condenser 11 for condensation. The condensed water enters the reuse water tank 12 for recycling and reuse for toilet flushing.

[0058] S5: The concentrated liquid produced by the electric heating low temperature evaporator 10 enters the salt filter tank 16 for filtration. The filtered mother liquor is returned to the electric heating low temperature evaporator 10 through the mother liquor pump 17 for evaporation. The salt mud precipitated from the salt filter tank 16 enters the vacuum scraper dryer 18 for drying and disposal. Example 3

[0059] The specific recycling treatment method of Example 2 is used to reuse the discharge from an ecological toilet, including the following steps:

[0060] S1: Based on the location and number of squat pits of the toilet, calculate the daily amount of sewage and fecal matter that the ecological toilet needs to treat through quotas. Based on the daily amount of fecal matter produced, as well as parameters such as molecular weight, solid content, calorific value, carbon-nitrogen ratio, and moisture content, calculate the amount of straw, conditioner, and biological agent required to be added in proportion to keep the moisture content of the prepared materials within 50%-60%;

[0061] S2: Based on the total mass and bulk density of the materials in S1 and the reaction cycle of the fermenter, which 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 an appropriate height-to-diameter ratio to determine the size of the fermenter. The filling factor of the fermenter is 0.5 to 0.75;

[0062] 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.

[0063] S4: Based on the external ambient temperature, the heat generated during the fermentation process, and the thermal insulation performance of the fermentation tank, calculate the thickness and material of the insulation layer to ensure temperature stability during the fermentation process; based on the size of the fermentation tank and the heat exchange requirements, determine the material, diameter, length, and spacing of the heat exchange coil through simulation calculation to achieve efficient heat exchange; use the PLC control unit to monitor the temperature, humidity, oxygen concentration and other parameters in the fermentation tank in real time, and automatically adjust the working status of the lifting water pump and air pump according to the set values to maintain the stability of the fermentation environment; select the appropriate type and amount of activated carbon based on the main components and concentration of the odor generated by fermentation; determine the power and model of the lifting water pump by calculating the flow rate and temperature of the sewage to achieve efficient exchange of heat energy between the sewage and the fermentation tank;

[0064] S5: Select evaporation equipment and supporting equipment with appropriate evaporation capacity according to the amount of sewage. Example 4

[0065] The present invention also provides a method for recycling heat energy in an ecological toilet waste 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:

[0066] S1: When the temperature of the material in the fermentation tank 7 reaches above 60°C, the first lift pump 4.1 is started to pump the supernatant (cold water) from the septic tank 1 from the regulating water tank 2 to the paddle heat exchange coil 7.2. At the same time, the stirring speed of the paddle heat exchange coil 7.2 is controlled so that heat transfer occurs between the fermentation substrate in the fermentation tank 7 and the paddle heat exchange coil 7.2 during the stirring process, transferring bioheat energy (Q1) to the cold water in the paddle heat exchange coil 7.2, thereby achieving the purpose of preheating.

[0067] 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, causing the coolant to heat up. 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 then enters the air heat exchanger, absorbs heat energy from the air (Q3), and then circulates to the compressor for work heating. The fermentation tank outlet water returns to the hot water storage tank. When the temperature in the regulating water storage tank 2 is preheated, the outlet water enters the electrically heated low-temperature evaporator 10.

[0068] S3: An electric heater is set in the electric heating low-temperature evaporator 10 to convert electrical energy (Q5) into thermal energy. By setting the electric heating low-temperature evaporator 10, it is maintained at 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 concentrate 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 multiple times and the salt production is less than 1kg / m 3 ;

[0069] S4: The cooling water from the condenser 11 is collected and recycled into the recycling water tank 12 for recycling to flush the toilet.

[0070] 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 principles of the present invention. These improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims

1. An ecological toilet waste recycling and treatment system, characterized in that: It includes a septic tank (1), a regulating water tank (2), a raw material preparation tank (6), a fermentation tank (7), an electric heating 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 the 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 the 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 the compression heat pump unit (9); The other end of the regulating water tank (2) is connected to the electric heating low-temperature evaporator (10) through the second lifting water pump (4.2), and the electric heating low-temperature evaporator (10) is connected to the condenser (11) and the salt filter tank (16) respectively. The bottom of the condenser (11) is connected to the recycling water tank (12), and the salt filter tank (16) is connected to the vacuum scraper dryer (18); The raw material preparation tank (6) is provided with a stirrer consisting 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 provided at the bottom of the fermentation tank (7), and the collected leachate flows back to the regulating water tank (2); 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.

2. A method for recycling waste from an ecological toilet using the waste recycling and treatment system of claim 1, 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 manure solids with auxiliary materials, and adjusting the moisture content of the fermentation raw materials by adding the 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 reuse water tank for recycling and flushing. S5: The concentrated liquid produced by the low-temperature evaporator enters the salt filter tank for filtration. The filtered mother liquor is returned 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.

3. The method for recycling and treating waste from an ecological toilet according to claim 2, characterized in that: In step S2, the auxiliary materials are composed of straw, conditioner and biological agent; the moisture content of the fermentation raw materials is adjusted to 50% to 60%.

4. The method for recycling and treating waste from an ecological toilet according to claim 2, characterized in that: In step S3, the activated carbon adsorption device can adsorb more than 95% of odor pollutants.

5. The method for recycling and treating waste from an ecological toilet according to claim 2, 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%.

6. A method for recycling heat energy using the ecological toilet waste recycling 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 water pump (4.1) is started to draw 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) undergo a heat transfer process 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; 2) The preheated supernatant enters the compression heat pump unit (9) for heat exchange, and the heated supernatant flows back to the regulating water tank (2). When the temperature in the regulating water tank (2) is preheated, the outlet water enters the electric heating low-temperature evaporator (10); 3) The electric heater in the electrically heated low-temperature evaporator (10) converts electrical energy into thermal energy, maintains an appropriate vacuum degree and temperature, and evaporates the water outlet from the regulating water tank (2) at a low temperature. The generated steam enters the condenser (11) for cooling. The concentrated liquid generated by the electrically heated low-temperature evaporator (10) enters the salt filter tank (16) for filtration. The precipitated salt mud enters the vacuum scraper dryer (18) for drying and disposal. 4) The cooling water from the condenser (11) is collected and recycled into the recycling water tank (12) for recycling and flushing toilets.

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