Wastewater zero-emission recovery system and method based on biothermal evaporation

Abstract

A wastewater zero discharge recovery system based on biological heat evaporation, comprising a heat pump unit, a cold source pipeline and a heat source pipeline; a reaction unit, having a reaction space, a fermentation part and a condensation part, the cold source pipeline extends into the reaction space and passes through the condensation part, the heat source pipeline extends into the reaction space and passes through the fermentation part; a wastewater storage unit, having a wastewater storage device, a water pump and a wastewater spraying pipe, the water pump is connected to the wastewater spraying pipe, the wastewater spraying pipe extends into the reaction space, the wastewater is stored in the wastewater storage device; a recovery unit, having a recovery storage device and a water recovery pipe, the water recovery pipe extends into the reaction space, one end of the water recovery pipe extending out of the reaction unit is connected to the recovery storage device; thereby the wastewater can be quickly treated, the wastewater is introduced into the high temperature environment generated during the fermentation of waste materials, the wastewater is vaporized into water vapor, and further condensed into water droplets for recovery.

Description

Technical Field

[0001] This invention relates to the field of wastewater recycling technology, and in particular to a wastewater zero-discharge recycling system and method based on biothermal evaporation. Background Technology

[0002] Agricultural or industrial wastewater is treated at a wastewater treatment plant before being discharged, thereby reducing the emission of organic pollutants.

[0003] Treatment methods can be divided into physical treatment, chemical treatment and biological treatment according to different operating methods. The selection is based on the ammonia nitrogen content in the wastewater. For wastewater with higher ammonia nitrogen concentration, physical treatment (recovery) methods are the main choice, while for wastewater with lower ammonia nitrogen concentration, chemical treatment methods or traditional biological nitrification / denitrification processes can be selected depending on the size of the site. For example, traditional aeration tanks are used to promote the biological oxidation of wastewater and reduce pollutants in wastewater by using oxygen and microbial action.

[0004] However, the above-mentioned method of using aeration tanks requires an appropriate site size, which limits its use to a larger site. When the site is small, only more expensive chemical treatment methods such as breakpoint chlorination can be used.

[0005] However, the aeration method requires the wastewater to remain for several hours, making it impossible to quickly treat and recycle the wastewater. Summary of the Invention

[0006] To achieve rapid wastewater recycling, and simultaneously realize water recovery and conversion of organic waste materials into organic fertilizer while treating wastewater, as well as using the heat generated by the organic waste materials to vaporize the wastewater, a zero-discharge wastewater recycling system based on biothermal evaporation is proposed for wastewater treatment, comprising: A heat pump unit includes a cold source outlet, a cold source inlet, a heat source outlet, and a heat source inlet, and further includes a cold source pipe with its opposite ends connected to the cold source outlet and the cold source inlet, and a heat source pipe with its opposite ends connected to the heat source outlet and the heat source inlet, respectively. The reaction unit includes a reaction space, a fermentation section and a condensation section. The fermentation section is located at the bottom of the reaction space, and the condensation section is located at the top of the reaction space. A cold source pipe extends into the reaction space and passes through the condensation section, and a heat source pipe extends into the reaction space and passes through the fermentation section. The wastewater storage unit includes a wastewater storage tank, a water pump and a wastewater spray pipe. The water pump is installed in the wastewater storage tank and connected to the wastewater spray pipe. The wastewater spray pipe extends into the reaction space and extends horizontally and is located above the fermentation section. The wastewater is stored in the wastewater storage tank. The recovery unit includes a recovery storage tank and a water recovery pipe. The water recovery pipe extends into the reaction space and is positioned below the condenser in a horizontal direction. One end of the water recovery pipe extending out of the reaction unit is connected to the recovery storage tank. Waste materials are fermented in this fermentation unit, generating a high-temperature heat source. Start the water pump so that the wastewater is injected into the reaction space through the wastewater spray pipe and comes into contact with the fermentation section; The high-temperature heat source vaporizes the wastewater in contact with the fermentation section, converting it into water vapor. Water vapor moves within the reaction space to the condenser and condenses into recycled water; The recycled water drips from the condenser and is collected in the water recycling pipe, then flows out of the reaction space through the water recycling pipe and into the recycling storage tank.

[0007] Furthermore, a temperature and humidity sensor and a gas circulation fan are installed in the reaction space, with the gas circulation fan facing the condenser section. A smart control module is electrically connected to the temperature and humidity sensor and the gas circulation fan.

[0008] Furthermore, the condenser section includes multiple fins, the surfaces of which have alternating hydrophobic and hydrophilic nano-coatings, and the cold source pipes pass through the fins.

[0009] Furthermore, the wastewater spray pipe has multiple nozzles.

[0010] Furthermore, a blower is installed in the reaction unit, and the blower has an air supply section that is connected to the reaction space.

[0011] A wastewater zero-discharge recovery method based on the above-mentioned wastewater zero-discharge recovery system based on biological thermal evaporation is also proposed for wastewater treatment, comprising the following steps: The waste materials are fermented in the fermentation section of the reaction space to generate a high-temperature heat source; The wastewater is injected into the reaction space and comes into contact with the high-temperature heat source, causing the wastewater in contact with the high-temperature heat source to be vaporized and converted into water vapor; Water vapor moves to the condenser within the reaction space and condenses into recycled water; The recycled water drips from the condenser and is collected in the water recycling pipe, then flows out of the reaction space through the water recycling pipe and into the recycling storage tank.

[0012] Furthermore, the gas circulation fan blows water vapor towards the condenser, and the temperature and humidity sensors detect the temperature and humidity of the reaction space. The intelligent control module controls the opening and closing of the gas circulation fan based on the temperature and humidity of the reaction space.

[0013] Furthermore, the wastewater is atomized into fine water droplets through multiple nozzles and then injected into the reaction space.

[0014] Furthermore, during fermentation, a blower supplies air to introduce outside air into the reaction space.

[0015] Furthermore, the cold source pipe of the heat pump unit is extended into the condenser section to maintain the condensation temperature of the condenser section; the heat source pipe of the heat pump unit is passed through the fermentation section to maintain the fermentation temperature of the fermentation section.

[0016] The following effects can be achieved based on the above technical features: 1. It can quickly treat wastewater by introducing it into the high-temperature environment generated during the fermentation of waste materials, causing the wastewater to vaporize into water vapor and then condense into water droplets for recycling.

[0017] 2. The heat source generated during the operation of the heat pump can be used in the fermentation section to maintain the temperature of waste materials during fermentation, and the cold source generated can be used in the condensation section to maintain the condensation temperature of the finned water vapor.

[0018] 3. By integrating the high temperature generated during the fermentation of waste materials, the vaporization of wastewater into water vapor upon contact with the high temperature, the condensation of water vapor into recycled water upon contact with the condenser, and the use of heat pumps to generate cold and heat sources to supply the condenser and fermentation sections respectively, the system can maintain their respective operating temperatures. This achieves the systematization of wastewater, waste materials, and heat energy, enabling rapid wastewater treatment and simultaneous water recycling, while saving energy.

[0019] 4. After fermentation, waste materials can be used as organic fertilizer substrate, enabling waste materials to be reused.

[0020] 5. Alternating hydrophobic and hydrophilic nano-coatings on the fin surface can accelerate vapor condensation and inhibit pollutant adhesion, thereby improving condensation efficiency. Attached Figure Description

[0021] Figure 1 This is a block diagram of the present invention.

[0022] Figure 2 This is a flowchart of the present invention.

[0023] The reference numerals are as follows: 1 Heat pump unit; 11 Heat source pipeline; 12 Cold source pipeline; 2 Reaction unit; 21 Fermentation section; 22 Condensation section; 23 Temperature and humidity sensor; 24 Gas circulation fan; 25 Blower; 3 Wastewater storage unit; 4 Recovery unit; 5 Intelligent control module. Detailed Implementation

[0024] The main benefits of the wastewater zero-discharge recovery system and method based on biothermal evaporation of the present invention will be clearly demonstrated in the following embodiments.

[0025] Please see Figure 1 and Figure 2The present invention relates to a wastewater zero-discharge recovery system based on biothermal evaporation, which is used to treat wastewater. The wastewater zero-discharge recovery system based on biothermal evaporation includes a heat pump unit 1, a reaction unit 2, a wastewater storage unit 3, a recovery unit 4, and a smart control module 5.

[0026] The heat pump unit 1 has a cold source outlet, a cold source inlet, a heat source outlet and a heat source inlet, and a cold source pipe 12 with its opposite ends connected to the cold source outlet and the cold source inlet, and a heat source pipe 11 with its opposite ends connected to the heat source outlet and the heat source inlet, respectively.

[0027] The reaction unit 2 has a reaction space, a fermentation section 21, and a condensation section 22. The fermentation section 21 is located at the bottom of the reaction space, and the condensation section 22 is located at the top of the reaction space. A cold source pipe 12 extends into the reaction space and passes through the condensation section 22, and a heat source pipe 11 extends into the reaction space and passes through the fermentation section 21. A temperature and humidity sensor 23 and a gas circulation fan 24 are located in the reaction space, and the gas circulation fan 24 supplies air to the condensation section 22. Specifically, the condensation section 22 includes multiple fins, which are spiral in shape and have alternating hydrophobic and hydrophilic nano-coatings on their surfaces. The cold source pipe 12 passes through the fins. A blower 25 is located in the reaction unit 2, and the blower 25 has an air supply section that connects to the reaction space.

[0028] The wastewater storage unit 3 has a wastewater storage container, a water pump, and a wastewater spray pipe. The water pump is installed in the wastewater storage container and connected to the wastewater spray pipe. The wastewater spray pipe extends into the reaction space and is positioned above the fermentation section 21 in a horizontal direction. The wastewater is stored in the wastewater storage container. Specifically, the wastewater spray pipe is provided with multiple spray holes, and the aforementioned spray holes are respectively connected to multiple nozzles.

[0029] The recycling unit 4 has a recycling reservoir and a water recycling pipe. The water recycling pipe extends into the reaction space and is positioned below the condenser section 22 in a horizontal direction. One end of the water recycling pipe extends out of the reaction unit 2 and is connected to the recycling reservoir.

[0030] The intelligent control module 5 is electrically connected to the temperature and humidity sensor 23, the gas circulation fan 24, the heat pump unit 1, the blower 25, and the wastewater storage unit 3.

[0031] Using a biothermal evaporation-based wastewater zero-discharge recovery system to perform a biothermal evaporation-based wastewater zero-discharge recovery method includes the following steps: A waste material is fermented in the fermentation section 21 to generate a high-temperature heat source, which is the bioheat mentioned in this case. Bioheat refers to the heat released by the decomposition of the waste material by microorganisms in the fermentation section. The high-temperature heat source is between 40°C and 85°C. During fermentation, the moisture content inside the reaction space is controlled between 35% and 85%, and external air is introduced into the reaction space through the blower 25. The waste material is organic waste material, including agricultural materials such as sawdust and waste mushroom bags.

[0032] The water pump is started, allowing the wastewater to be injected into the reaction space through the wastewater spray pipe and come into contact with the fermentation section 21. The wastewater is then sprayed out through the aforementioned nozzles, atomizing it into droplets with a droplet size between 50 μm and 300 μm, and maintaining a spray intensity of 5 L / m. 2 ·min up to 60L / m 2 Between ·min; the high-temperature heat source causes the wastewater in contact with the fermentation section 21 to be vaporized and converted into water vapor.

[0033] The gas circulation fan 24 blows the water vapor toward the condenser 22, and the intelligent control module 5 controls the opening and closing of the gas circulation fan 24 according to the temperature and humidity of the reaction space.

[0034] The water vapor moves to the condenser 22 within the reaction space and condenses into recycled water, making the chemical oxygen demand (COD) of the recycled water less than 50 mg / L. Specifically, by setting the aforementioned fins of the condenser 22 in a spiral shape and having alternating hydrophobic and hydrophilic nano-coatings (such as polydimethylsiloxane / titanium dioxide) on their surfaces, and by setting the condensation temperature of the condenser 22 between 7°C and 28°C, the water vapor can be accelerated to condense into recycled water, and pollutants can be inhibited from adhering to the aforementioned fins.

[0035] The recycled water drips from the condenser 22 and is collected in the water recycling pipe. It then flows out of the reaction space through the water recycling pipe and into the recycling storage tank, achieving recycling and zero discharge.

[0036] During operation, initially, the cold source pipe 12 of the heat pump is inserted into the condenser section 22 to maintain the condensation temperature of the condenser section 22, and the heat source pipe 11 of the heat pump passes through the fermentation section 21 to maintain the fermentation temperature of the fermentation section 21. When the waste materials in the fermentation section 21 continue to ferment, the heat supply of the heat source pipe 11 can be stopped in time, so that the heat pump does not need to provide continuous heating and can save energy.

[0037] The wastewater treated by this invention includes, for example, organic wastewater such as food processing wastewater and agricultural / livestock wastewater. Taking the treatment of food processing wastewater using the system of this invention as an example, the relevant parameter settings include: setting the density of waste materials used in the fermentation unit 21 between 0.1 and 0.8 tons / cubic meter; setting the initial temperature of the fermentation unit 21 between 40°C and 80°C; and setting the spray intensity for spraying the wastewater at 8 L / m³. 2 The wastewater temperature is 25°C. Through the treatment of this invention, a water recovery rate of about 80% to 95% can be obtained. By reusing the wastewater and treating it into recycled water, the recycled water can be used for factory cleaning, thereby achieving the effect of zero wastewater discharge.

[0038] Based on the above description of the embodiments, one can fully understand the operation, use and effects of the present invention. However, the above embodiments are only preferred embodiments of the present invention and should not be construed as limiting the scope of the present invention. Simple equivalent changes and modifications made in accordance with the scope of the patent application and the description of the invention are all within the scope of the present invention.

Claims

1. A wastewater zero-discharge recovery system based on biological thermal evaporation, characterized in that, For treating wastewater, including: A heat pump unit includes a cold source outlet, a cold source inlet, a heat source outlet, and a heat source inlet, and further includes a cold source pipe with its opposite ends connected to the cold source outlet and the cold source inlet, and a heat source pipe with its opposite ends connected to the heat source outlet and the heat source inlet, respectively. The reaction unit includes a reaction space, a fermentation section and a condensation section. The fermentation section is located at the bottom of the reaction space, and the condensation section is located at the top of the reaction space. A cold source pipe extends into the reaction space and passes through the condensation section, and a heat source pipe extends into the reaction space and passes through the fermentation section. The wastewater storage unit includes a wastewater storage tank, a water pump and a wastewater spray pipe. The water pump is installed in the wastewater storage tank and connected to the wastewater spray pipe. The wastewater spray pipe extends into the reaction space and extends horizontally and is located above the fermentation section. The wastewater is stored in the wastewater storage tank. The recovery unit includes a recovery storage tank and a water recovery pipe. The water recovery pipe extends into the reaction space and is positioned below the condenser in a horizontal direction. One end of the water recovery pipe extending out of the reaction unit is connected to the recovery storage tank. Waste materials are fermented in this fermentation unit, generating a high-temperature heat source. Start the water pump so that the wastewater is injected into the reaction space through the wastewater spray pipe and comes into contact with the fermentation section; The high-temperature heat source vaporizes the wastewater in contact with the fermentation section, converting it into water vapor. Water vapor moves within the reaction space to the condenser and condenses into recycled water; The recycled water drips from the condenser and is collected in the water recycling pipe, then flows out of the reaction space through the water recycling pipe and into the recycling storage tank.

2. The wastewater zero-discharge recovery system based on biothermal evaporation according to claim 1, characterized in that, A temperature and humidity sensor and a gas circulation fan are installed in the reaction space. The gas circulation fan is positioned facing the condenser section. A smart control module is electrically connected to the temperature and humidity sensor and the gas circulation fan.

3. The wastewater zero-discharge recovery system based on biothermal evaporation according to claim 1, characterized in that, The condenser section includes multiple fins, the surfaces of which have alternating hydrophobic and hydrophilic nanocoatings, and the cold source pipes pass through the fins.

4. The wastewater zero-discharge recovery system based on biothermal evaporation according to claim 1, characterized in that, The wastewater spray pipe has multiple nozzles.

5. The wastewater zero-discharge recovery system based on biothermal evaporation according to claim 1, characterized in that, A blower is installed in the reaction unit, and the blower has an air supply section that is connected to the reaction space.

6. A method for zero-discharge wastewater recovery based on a biological thermal evaporation-based wastewater zero-discharge recovery system according to any one of claims 1 to 5, characterized in that, For wastewater treatment, the following steps are included: The waste materials are fermented in the fermentation section of the reaction space to generate a high-temperature heat source; The wastewater is injected into the reaction space and comes into contact with the high-temperature heat source, causing the wastewater in contact with the high-temperature heat source to be vaporized and converted into water vapor; Water vapor moves to the condenser within the reaction space and condenses into recycled water; The recycled water drips from the condenser and is collected in the water recycling pipe, then flows out of the reaction space through the water recycling pipe and into the recycling storage tank.

7. The wastewater zero-discharge recovery method based on biothermal evaporation according to claim 6, characterized in that, The gas circulation fan blows water vapor towards the condenser, and the temperature and humidity sensors detect the temperature and humidity of the reaction space. The intelligent control module controls the opening and closing of the gas circulation fan based on the temperature and humidity of the reaction space.

8. The wastewater zero-discharge recovery method based on biothermal evaporation according to claim 6, characterized in that, The wastewater is atomized into fine water droplets through multiple nozzles and then injected into the reaction space.

9. The wastewater zero-discharge recovery method based on biothermal evaporation according to claim 6, characterized in that, During fermentation, a blower supplies air to draw outside air into the reaction space.

10. The wastewater zero-discharge recovery method based on biothermal evaporation according to claim 6, characterized in that, The cold source pipe of the heat pump unit extends into the condenser section to maintain the condensation temperature of the condenser section; the heat source pipe of the heat pump unit passes through the fermentation section to maintain the fermentation temperature of the fermentation section.

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