System and method for zero liquid discharge wastewater recovery using bio-thermal evaporation

Abstract

A wastewater zero-discharge recovery system based on biothermal evaporation includes a heat pump unit with a cold source pipeline and a heat source pipeline; a reaction unit with a reaction space, a fermentation section, and a condensation section, wherein the cold source pipeline extends into the reaction space and passes through the condensation section, and the heat source pipeline extends into the reaction space and passes through the fermentation section; a wastewater storage unit with a wastewater reservoir, a water pump, and a wastewater spray pipe, wherein the water pump is connected to the wastewater spray pipe, the wastewater spray pipe extends into the reaction space, and the wastewater is stored in the wastewater reservoir; and a recovery unit with a recovery reservoir and a water recovery pipe, wherein the water recovery pipe extends into the reaction space, and one end of the water recovery pipe extends out of the reaction unit and connects to the recovery reservoir; thereby enabling rapid wastewater treatment by introducing the wastewater into the high-temperature environment generated during the fermentation of waste materials, causing the wastewater to vaporize into water vapor, which is then further condensed into water droplets for recovery.

Description

[Technical Field]

[0001] This invention relates to a wastewater recycling system and method, and more particularly to a wastewater zero-discharge recycling system and method based on biological thermal evaporation. [Previous Technology]

[0002] Agricultural or industrial wastewater will be purified by a sewage treatment plant before being discharged, thereby reducing the discharge of organic pollutants.

[0003] The treatment methods can be divided into physical treatment, chemical treatment and biological treatment according to different operation methods. The selection is based on the ammonia nitrogen content in the wastewater. For wastewater with higher ammonia nitrogen concentration, physical treatment (recovery) method is the main method, while for wastewater with lower ammonia nitrogen concentration, chemical treatment method or traditional biological nitrification / denitrification process can be selected according to 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, and its use is limited to the need for a larger site. When the site is small, only costly chemical treatment methods such as breakpoint chlorination can be used.

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

[0006] Therefore, in order to achieve rapid wastewater recovery, and simultaneously realize water recovery, convert organic materials into organic fertilizer, and use the heat source generated by the organic materials to vaporize the wastewater, the present invention proposes a wastewater zero-discharge recovery system based on biological thermal evaporation, for treating a wastewater, comprising:

[0007] A heat pump unit has a cold source outlet, a cold source inlet, a heat source outlet, and a heat source inlet. Two opposite ends of a cold source pipe are respectively connected to the cold source outlet and the cold source inlet, and two opposite ends of a heat source pipe are respectively connected to the heat source outlet and the heat source inlet. A reaction unit has 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. The cold source pipe extends into the reaction space and passes through the condensation section, and the heat source pipe extends into the reaction space and passes through the fermentation section. A wastewater storage unit has a wastewater storage tank, a water pump, and a wastewater spray pipe. The water pump is located inside the wastewater storage tank and connected to the wastewater spray pipe. The wastewater spray pipe extends into the reaction space and extends along a horizontal direction. An extension unit is positioned above the fermentation section, and the wastewater is stored in the wastewater storage tank. A recycling unit includes a recycling storage tank and a water recycling pipe. The water recycling pipe extends into the reaction space and extends horizontally, positioned below the condensation section. One end of the water recycling pipe extending out of the reaction unit connects to the recycling storage tank. A waste material is fermented in the fermentation section to generate a high-temperature heat source. The water pump is activated, allowing the wastewater to be injected into the reaction space through the wastewater spray pipe and come 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. The water vapor moves within the reaction space to the condensation section and condenses into recycled water. The recycled water drips from the condensation section and is collected in the water recycling pipe, flowing out of the reaction space through the water recycling pipe and into the recycling storage tank.

[0008] Furthermore, a temperature and humidity sensor and a gas circulation fan are installed in the reaction space. The gas circulation fan is positioned towards the condenser section. A smart control module is electrically connected to the temperature and humidity sensor and the gas circulation fan.

[0009] Furthermore, the condensation section includes a plurality of fins, the surfaces of which have alternately arranged hydrophobic nano-coatings and hydrophilic nano-coatings, and the cold source pipe passes through the aforementioned fins.

[0010] Furthermore, the wastewater spray pipe has a plurality of nozzles.

[0011] Furthermore, a blower is provided in the reaction unit, and the blower has an air supply section that is connected to the reaction space.

[0012] A wastewater zero-discharge recovery method based on biothermal evaporation is used to treat wastewater. The wastewater zero-discharge recovery method based on biothermal evaporation includes the following steps:

[0013] A waste material is fermented in a fermentation section of a 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, so that the wastewater in contact with the high-temperature heat source is vaporized and converted into water vapor; the water vapor moves to a condensation section in the reaction space and condenses into recycled water; the recycled water drips from the condensation section and is collected in a water recycling pipe, and flows out of the reaction space through the water recycling pipe and into a recycling storage tank.

[0014] Furthermore, a gas circulation fan blows the water vapor toward the location of the condenser, and a temperature and humidity sensor detects the temperature and humidity of the reaction space. A smart control module controls the opening and closing of the gas circulation fan according to the temperature and humidity of the reaction space.

[0015] Furthermore, the wastewater is atomized into fine water droplets through a plurality of nozzles and then injected into the reaction space.

[0016] Furthermore, during fermentation, a blower is used to supply air to introduce external air into the reaction space.

[0017] Further, a cold source pipe of a heat pump is inserted into the condenser section to maintain the condensation temperature of the condenser section; a heat source pipe of the heat pump is passed through the fermentation section to maintain the fermentation temperature of the fermentation section.

[0018] The following effects can be achieved based on the above technical features:

[0019] 1. It can quickly treat wastewater by introducing the wastewater into the high-temperature environment generated during the fermentation of waste materials, causing the wastewater to vaporize into water vapor and further condense into water droplets for recycling.

[0020] 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.

[0021] 3. Alternating hydrophobic and hydrophilic nanocoatings on the fin surface can accelerate vapor condensation and inhibit pollutant adhesion, thereby improving condensation efficiency.

[0022] 4. After fermentation, waste materials can be used as organic fertilizer substrate, enabling waste materials to be reused.

[0023] 5. 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 cold and heat sources generated by the heat pump to provide cold and heat sources to the condenser and fermentation sections respectively, the operating temperature of each section can be maintained. This achieves the systematization of wastewater, waste materials and heat energy, and saves energy usage.

Implementation Method

[0024] Based on the above technical features, the main effects of the wastewater zero-discharge recovery system and method based on biothermal evaporation of the present invention will be clearly presented in the following embodiments.

[0025] Please refer to Figure 1 and Figure 2. The present invention is a wastewater zero-discharge recovery system based on biothermal evaporation for treating 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 two opposite ends connected to the cold source outlet and the cold source inlet, and a heat source pipe 11 with its two 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. 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. The gas circulation fan 24 supplies air to the condensation section 22. Specifically, the condensation section 22 includes a plurality of fins. The fins are spiral-shaped 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. 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 extends along a horizontal direction and is located above the fermentation section 21. The wastewater is stored in the wastewater storage container. Specifically, the wastewater spray pipe is provided with a plurality of spray holes, and the aforementioned spray holes are respectively connected to a plurality of nozzles.

[0029] The recycling unit 4 has a recycling storage container and a water recycling pipe. The water recycling pipe extends into the reaction space and is located below the condenser 22 along the horizontal direction. One end of the water recycling pipe extending out of the reaction unit 2 is connected to the recycling storage container.

[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] A wastewater zero-discharge recovery method based on biothermal evaporation is performed using the biothermal evaporation-based wastewater zero-discharge recovery system, comprising the following steps:

[0032] A waste material is fermented in the fermentation section 21 to generate a high-temperature heat source. The high-temperature heat source 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.

[0033] The water pump is started, so that the wastewater is injected into the reaction space through the wastewater spray pipe and comes into contact with the fermentation section 21. The wastewater is sprayed out through the aforementioned nozzle and atomized into droplets, with the droplet size between 50μm and 300μm, and the spraying rate is maintained between 5L / m2∙min and 60L / m2∙min. The high temperature heat source causes the wastewater in contact with the fermentation section 21 to be vaporized and converted into water vapor.

[0034] and the gas circulation fan 24 blows the water vapor toward the condenser 22. 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.

[0035] The water vapor moves to the condenser 22 in the reaction space and condenses into recycled water, so that the chemical oxygen demand (COD) of the recycled water is less than 50 mg / L. Specifically, by setting the aforementioned fins in the condenser 22 in a spiral shape and having alternating hydrophobic and hydrophilic nanocoatings (such as polydimethylsiloxane / titanium dioxide) on the surface, the condensation temperature of the condenser 22 is set between 7°C and 28°C, which can accelerate the condensation of water vapor into recycled water and inhibit the adhesion of pollutants to the aforementioned fins.

[0036] 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.

[0037] In the initial stage of the operation, 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 is used to pass 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. The heat pump does not need to supply heat continuously and can save energy.

[0038] The wastewater treated by the present invention includes organic wastewater such as food processing wastewater and agricultural and aquaculture wastewater. The relevant parameter setting instructions for treating food processing wastewater include that the density of the waste materials used in the fermentation unit 21 is between 0.1 and 0.8 tons / cubic meter, the initial temperature of the fermentation unit 21 is 40°C to 80°C, the spraying rate of the wastewater is 8L / m2∙min, and the temperature of the wastewater is 25°C. Through the treatment of the present 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.

[0039] Based on the above description of the embodiments, the operation, use and effects of the present invention can be fully understood. However, the above embodiments are only preferred embodiments of the present invention and should not be used to limit 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. [Simplified Explanation of the Diagram]

[0040] [Figure 1] is a block diagram of the present invention.

[0041] [Figure 2] is a flowchart of the present invention.

Claims

1. A wastewater zero-discharge recovery system based on biothermal evaporation for treating wastewater, the wastewater zero-discharge recovery system based on biothermal evaporation comprising: a heat pump unit having a cold source outlet, a cold source inlet, a heat source outlet and a heat source inlet, a cold source pipe having its opposite ends connected to the cold source outlet and the cold source inlet respectively, and a heat source pipe having its opposite ends connected to the heat source outlet and the heat source inlet respectively; a reaction unit having a reaction space, a fermentation section and a condensation section, the fermentation section being disposed at the bottom of the reaction space, the condensation section being disposed at the top of the reaction space, the cold source pipe extending into the reaction space and passing through the condensation section, the heat source pipe extending into the reaction space and passing through the fermentation section, the condensation section comprising a plurality of fins, the surfaces of the aforementioned fins having alternately arranged hydrophobic nano-coatings and hydrophilic nano-coatings, the cold source pipe passing through the aforementioned fins; A wastewater storage unit includes a wastewater reservoir, a water pump, and a wastewater spray pipe. The water pump is located inside the wastewater reservoir and connected to the wastewater spray pipe. The wastewater spray pipe extends into the reaction space and is positioned above the fermentation section along a horizontal direction. The wastewater is stored in the wastewater reservoir. A recycling unit includes a recycling reservoir and a water recycling pipe. The water recycling pipe extends into the reaction space and is positioned below the condensation section along a horizontal direction. One end of the water recycling pipe extends out of the reaction unit and is connected to the recycling reservoir. An organic waste material is fermented in the fermentation section to generate a high-temperature heat source. The water pump is activated, allowing the wastewater to be injected into the reaction space through the wastewater spray pipe and contact the fermentation section. The high-temperature heat source vaporizes the wastewater in contact with the fermentation section, converting it into water vapor. The water vapor moves within the reaction space to the condensation section 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 as described in claim 1, wherein, 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 as described in claim 1, wherein, The wastewater spray pipe has multiple nozzles.

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

5. A wastewater zero-discharge recovery method based on biothermal evaporation for treating wastewater, the wastewater zero-discharge recovery method based on biothermal evaporation comprising the following steps: fermenting an organic waste material in a fermentation section of a reaction space to generate a high-temperature heat source; injecting the wastewater into the reaction space to contact the high-temperature heat source, causing the wastewater in contact with the high-temperature heat source to be vaporized and converted into water vapor; the water vapor moving to a condensation section in the reaction space and condensing into recycled water, the condensation section comprising a plurality of fins, the surfaces of the aforementioned fins having alternately arranged hydrophobic nano-coatings and hydrophilic nano-coatings; the recycled water dripping from the condensation section and being collected in a water recovery pipe, and flowing out of the reaction space through the water recovery pipe into a recovery storage tank.

6. The wastewater zero-discharge recovery method based on biological thermal evaporation as described in claim 5, wherein, A gas circulation fan blows the water vapor toward the condenser, and a temperature and humidity sensor detects the temperature and humidity of the reaction space. A smart control module controls the opening and closing of the gas circulation fan based on the temperature and humidity of the reaction space.

7. The wastewater zero-discharge recovery method based on biological thermal evaporation as described in claim 5, wherein, The wastewater is atomized into fine water droplets through multiple nozzles and then injected into the reaction space.

8. The wastewater zero-discharge recovery method based on biological thermal evaporation as described in claim 5, wherein, During fermentation, a blower supplies air to draw outside air into the reaction space.

9. The wastewater zero-discharge recovery method based on biothermal evaporation as described in claim 5, wherein, A cold source pipe of a heat pump is inserted into the condenser section to maintain the condensation temperature of the condenser section; a heat source pipe of the heat pump is passed through the fermentation section to maintain the fermentation temperature of the fermentation section.

Images