Apparatus for recovering resources from waste bittern

Abstract

This apparatus for recovering resources from waste bittern comprises: a potassium recovery module for recovering potassium from waste bittern; a magnesium recovery module for recovering magnesium by supplying sodium hydroxide to the waste bittern separated in the potassium recovery module; a calcium recovery module for recovering calcium by supplying sodium hydroxide and carbon dioxide to the solution separated in the magnesium recovery module; and a sodium recovery module for recovering sodium by electrolyzing the solution separated in the calcium recovery module and supplying carbon dioxide to the solution. In addition, the apparatus for recovering resources from waste bittern comprises a flow channel module which includes at least one flow channel connected to the potassium recovery module, the magnesium recovery module, the calcium recovery module, and the sodium recovery module so as to provide a passage through which at least one of potassium chloride, sodium hydroxide, magnesium hydroxide, carbon dioxide, calcium carbonate, sodium hydrogen carbonate, the solution, and water flows.

Description

Resource recovery device for wastewater treatment plants

[0001] The present invention relates to a resource recovery device for waste brine. This research was conducted with funding from the Ministry of SMEs and Startups (Government) and support from the Small and Medium Business Technology Information Promotion Agency (SME Technology Information Promotion Agency), as part of the Small and Medium Business Net-Zero Technology Innovation Development Project (Project Identification Number: 1055001064, Research Institution: August 1, 2022 - July 31, 2025, Project Name: Development of a CO2 Resource Process Utilizing High-Concentration Brine from Refined Salt Byproducts).

[0002] Bittern, the mother liquor left over after salt extraction, is a colorless crystal with a glassy sheen that dissolves when exposed to moisture. Bittern has long been used as a coagulant in tofu, and today it's also a valuable resource for inorganic chemicals. Bittern can be obtained as a byproduct of salt production, or by utilizing the deliquescence process during the storage of crude salt.

[0003] Depending on the source, bittern is classified into dehydrated salt bittern, concentrated seawater, solar salt bittern, and bittern from solar salt during storage, but it is known that it has a nearly consistent chemical composition regardless of the type. Except for those used in food processing and wastewater treatment, most of these bitterns are discarded, which increases the cost of their disposal. To address this, a treatment technology is being proposed that utilizes waste bittern, which is generated in large quantities in the salt farm and solar salt industries, as a raw material for magnesium production and an absorbent for carbon dioxide capture.

[0004] However, conventional treatment technology has the problem of low economic feasibility because it recovers only magnesium and calcium and recycles them into resources, and there is a problem of the purity of the recovered resources being reduced due to potassium and sodium still remaining in the wastewater.

[0005] The embodiments of the present invention were invented against the background described above, and are intended to provide a wastewater resource recovery device capable of recovering not only magnesium and calcium but also potassium and sodium from wastewater, and improving the purity of the recovered resources.

[0006] According to one aspect of the present invention, a wastewater resource recovery device comprises: a potassium recovery module including a cooling tank that cools the wastewater to separate potassium chloride from the wastewater and generates a first solution in which the potassium chloride is separated from the wastewater; a magnesium recovery module including a magnesium mixing tank that mixes the first solution with sodium hydroxide to generate a second solution, a magnesium solid-liquid separator that separates the second solution into a solid magnesium hydroxide and a third solution, and a magnesium separation membrane tank that separates the remaining magnesium hydroxide from the third solution and a fourth solution; a calcium recovery module including a calcium mixing tank that mixes the fourth solution, sodium hydroxide, and carbon dioxide to generate a fifth solution, a calcium solid-liquid separator that separates the fifth solution into a solid calcium carbonate and a sixth solution, and a calcium separation membrane tank that separates the remaining calcium carbonate from the sixth solution and a seventh solution; A sodium recovery module including an electrolysis unit that electrolyzes the seventh solution to generate sodium ions and chloride ions and supplies carbon dioxide to generate an eighth solution containing sodium bicarbonate, and a sodium solid-liquid separator that separates the eighth solution into sodium bicarbonate and water; and a flow path module that includes at least one flow path connected to the potassium recovery module, the magnesium recovery module, the calcium recovery module, and the sodium recovery module and provides a path through which at least one of the potassium chloride, the sodium hydroxide, the magnesium hydroxide, the carbon dioxide, the calcium carbonate, the sodium bicarbonate, the solution, and the water flows.

[0007] In addition, the potassium recovery module may further include a potassium solid-liquid separator that supplies the potassium chloride and the first solution from the cooling tank and separates the potassium chloride and the first solution; a potassium washing tank that supplies the potassium chloride from the potassium solid-liquid separator and washes the supplied potassium chloride; and a potassium dryer that supplies the washed potassium chloride from the potassium washing tank and dries the supplied potassium chloride.

[0008] In addition, a wastewater resource recovery device may be provided, wherein the above-mentioned flow module includes a first flow path connected to the cooling tank and providing a passage through which the wastewater flows to the cooling tank; a second flow path connected to the cooling tank and the potassium solid-liquid separator and providing a passage through which the potassium chloride and the first solution flow; a third flow path connected to the potassium solid-liquid separator and the potassium washing tank and providing a passage through which the potassium chloride flows; and a fourth flow path connected to the potassium washing tank and the potassium dryer and providing a passage through which the potassium chloride flows.

[0009] In addition, the magnesium recovery module may further include a magnesium washing tank that supplies the magnesium hydroxide from the magnesium solid-liquid separator and the magnesium separation membrane tank and washes the supplied magnesium hydroxide; a magnesium dryer that supplies the washed magnesium hydroxide from the magnesium washing tank and dries the supplied magnesium hydroxide; and a heat treatment furnace that supplies the dried magnesium hydroxide from the magnesium dryer and heat-treats the supplied magnesium hydroxide to produce magnesium oxide.

[0010] In addition, the flow module comprises: a fifth flow path connected to the cooling tank and the magnesium mixing tank and providing a flow path for the first solution; a sixth flow path connected to the magnesium mixing tank and the magnesium solid-liquid separator and providing a flow path for the second solution; a seventh flow path connected to the magnesium solid-liquid separator and the magnesium washing tank and providing a flow path for the magnesium hydroxide; an eighth flow path connected to the magnesium washing tank and the magnesium dryer and providing a flow path for the magnesium hydroxide; a ninth flow path connected to the magnesium dryer and the heat treatment furnace and providing a flow path for the magnesium hydroxide; a tenth flow path connected to the magnesium solid-liquid separator and the magnesium separation membrane tank and providing a flow path for the third solution; an eleventh flow path connected to the magnesium separation membrane tank and the seventh flow path and providing a flow path for the magnesium hydroxide; A wastewater resource recovery device may be provided, including a 21st passage connected to the magnesium washing tank and the electrolysis unit to provide a passage through which the washing liquid of the magnesium washing tank flows; and a 31st passage connected to the sodium solid-liquid separator and the magnesium washing tank to provide a passage through which the water flows.

[0011] In addition, the calcium recovery module may be provided with a wastewater resource recovery device that further includes a calcium dryer that supplies the calcium carbonate from the calcium solid-liquid separator and the calcium separation membrane tank and dries the supplied calcium carbonate.

[0012] In addition, a wastewater resource recovery device may be provided in which the euro module includes a 13th passage connected to the magnesium separation membrane tank and the calcium mixing tank to provide a passage through which the 4th solution flows; a 15th passage connected to the calcium mixing tank and the calcium solid-liquid separator to provide a passage through which the 5th solution flows; a 16th passage connected to the calcium solid-liquid separator and the calcium dryer to provide a passage through which the calcium carbonate flows; a 17th passage connected to the calcium solid-liquid separator and the calcium separation membrane tank to provide a passage through which the 6th solution flows; and an 18th passage connected to the calcium separation membrane tank and the 16th passage to provide a passage through which the calcium carbonate flows.

[0013] In addition, the electrolysis unit includes a solution tank containing the seventh solution; a sodium ion recovery tank disposed on one side of the solution tank, supplied with carbon dioxide, and including a cation separation membrane disposed between the solution tank and the sodium ion recovery tank and a cathode electrode for applying current; And a chlorine ion recovery tank including an anion separation membrane and an anode electrode for applying current, which are disposed on the other side of the solution tank and are disposed between the solution tank, and when the cathode electrode applies current, hydrogen ions and sodium ions from the solution tank move to the sodium ion recovery tank through the cation separation membrane and are mixed with carbon dioxide to generate hydrogen gas and the sodium bicarbonate, and when the anode electrode applies current, chlorine ions from the solution tank move to the chlorine ion recovery tank through the anion separation membrane to generate chlorine gas, can be provided.

[0014] In addition, a wastewater resource recovery device may be provided in which the electrolysis unit further includes a hydrogen gas collection unit that collects hydrogen gas generated in the sodium ion recovery tank; and a chlorine gas collection unit that collects chlorine gas generated in the chlorine ion recovery tank.

[0015] In addition, the electrolysis unit further includes a water storage tank in which water supplied to the sodium ion recovery tank and the chlorine ion recovery tank is stored, and a wastewater resource recovery device may be provided in which water produced by the sodium solid-liquid separator, water inside the solution tank, and water inside the chlorine ion recovery tank are supplied and stored in the water storage tank.

[0016] In addition, the sodium recovery module may be provided with a wastewater resource recovery device that further includes a sodium dryer that supplies sodium bicarbonate from the sodium solid-liquid separator and dries the supplied sodium bicarbonate.

[0017] In addition, the flow module comprises: a 20th flow path connected to the calcium separation membrane tank and the solution receiving tank to provide a flow path for the 7th solution; a 25th flow path connected to the sodium ion recovery tank and the hydrogen gas collection unit to provide a flow path for the hydrogen gas; a 26th flow path connected to the chlorine ion recovery tank and the chlorine gas collection unit to provide a flow path for the chlorine gas; a 27th flow path connected to the sodium ion recovery tank and the sodium solid-liquid separator to provide a flow path for the 8th solution; a 28th flow path connected to the sodium solid-liquid separator and the sodium dryer to provide a flow path for the sodium bicarbonate; a 29th flow path connected to the solution receiving tank and the water storage tank to provide a flow path for the water; a 30th flow path connected to the chlorine ion recovery tank and the water storage tank to provide a flow path for the water inside the chlorine ion recovery tank to flow to the water storage tank; A wastewater resource recovery device may be provided, including a 32nd passage connected to the water storage tank and providing a passage through which water produced in the sodium solid-liquid separator flows into the water storage tank; a 33rd passage connected to the water storage tank and the sodium ion recovery tank and providing a passage through which water stored in the water storage tank flows into the sodium ion recovery tank; and a 34th passage connected to the water storage tank and the chlorine ion recovery tank and providing a passage through which water stored in the water storage tank flows into the chlorine ion recovery tank.

[0018] In addition, a wastewater resource recovery device may be provided that further includes a sodium hydroxide storage tank in which sodium hydroxide supplied to the magnesium mixing tank and the calcium mixing tank is stored.

[0019] In addition, a wastewater resource recovery device may be provided, wherein the euro module includes a 12th passage connected to the magnesium mixing tank and the sodium hydroxide storage tank to provide a passage through which the sodium hydroxide flows; and a 14th passage connected to the calcium mixing tank and the sodium hydroxide storage tank to provide a passage through which the sodium hydroxide flows.

[0020] In addition, a wastewater resource recovery device may be provided that further includes a carbon dioxide storage tank that stores carbon dioxide supplied to the calcium mixing tank and the electrolysis unit.

[0021] In addition, a wastewater resource recovery device may be provided, wherein the euro module includes a 19th passage connected to the calcium mixing tank and the carbon dioxide storage tank to provide a passage through which the carbon dioxide flows; and a 22nd passage connected to the electrolysis unit and the carbon dioxide storage tank to provide a passage through which the carbon dioxide flows.

[0022] According to embodiments of the present invention, not only magnesium and calcium, but also potassium and sodium can be recovered from wastewater, and there is an effect of improving the purity of the recovered resources.

[0023] Figure 1 is a block diagram of a wastewater resource recovery device according to one embodiment of the present invention.

[0024] Figure 2 is a drawing showing a resource recovery device for the waste water of Figure 1.

[0025] Figure 3 is a drawing showing a part of the electrolysis unit of Figure 2.

[0026] Hereinafter, specific embodiments for implementing the technical idea of ​​the present invention will be described in detail with reference to the drawings.

[0027] In addition, when explaining the present invention, if it is determined that a detailed description of a related known configuration or function may obscure the gist of the present invention, the detailed description is omitted.

[0028] Additionally, when it is mentioned that a component is 'connected', 'supported', 'connected', 'supplied', 'transmitted' or 'in contact with' another component, it should be understood that it may be directly connected, supported, connected, supplied, transmitted or in contact with that other component, but there may also be other components present in between.

[0029] The terminology used herein is intended solely to describe specific embodiments and is not intended to limit the invention. Singular expressions include plural expressions unless the context clearly dictates otherwise.

[0030] Additionally, please note that the terms "upper side," "lower side," and "side" in this specification are based on the illustrations in the drawings and may be expressed differently if the orientation of the subject changes. For the same reason, some components in the attached drawings are exaggerated, omitted, or schematically depicted, and the sizes of each component do not fully reflect the actual size.

[0031] Additionally, terms that include ordinal numbers, such as "first," "second," etc., may be used to describe various components, but these components are not limited by such terms. These terms are used solely to distinguish one component from another.

[0032] The term "comprising" as used in the specification means specifying a particular characteristic, region, integer, step, operation, element and / or component, but does not exclude the presence or addition of other particular characteristics, regions, integers, steps, operations, elements, components and / or groups.

[0033] Hereinafter, a specific configuration of a wastewater resource recovery device according to one embodiment of the present invention will be described with reference to the drawings.

[0034] Referring to FIGS. 1 and 2, a wastewater resource recovery device (10) according to one embodiment of the present invention can recover potassium, magnesium, calcium, and sodium from wastewater. This wastewater resource recovery device (10) can include a potassium recovery module (100), a magnesium recovery module (200), a calcium recovery module (300), a sodium recovery module (400), a sodium hydroxide storage tank (500), a carbon dioxide storage tank (600), and a flow module (700).

[0035] A potassium recovery module (100) can recover potassium from wastewater. This potassium recovery module (100) can include a cooling tank (110), a potassium solid-liquid separator (120), a potassium washing tank (130), and a potassium dryer (140).

[0036] The cooling tank (110) can accommodate and cool wastewater. A receiving space for accommodating wastewater can be provided inside the cooling tank (110), and a cooling means for cooling the wastewater can be arranged inside the receiving space. The cooling tank (110) is connected to a first channel (701) of a flow module (700) described below, so that wastewater can flow in through the first channel (701). The cooling tank (110) can cool the wastewater accommodated therein at 0°C to 5°C for up to 48 hours. In this way, when the wastewater is cooled, potassium chloride contained in the wastewater can change into a crystal form. The cooling tank (110) can cool the wastewater to form potassium chloride in a crystal form and produce a first solution in which potassium chloride is separated from the wastewater. These cooling tanks (110) may be provided in multiple units and connected sequentially to increase the purity and production amount of potassium chloride.

[0037] The potassium solid-liquid separator (120) can separate potassium chloride and the first solution. This potassium solid-liquid separator (120) can be connected to the cooling tank (110) through the second flow path (702) of the flow path module (700) described below. In other words, potassium chloride and a small amount of the first solution containing potassium chloride can be supplied to the potassium solid-liquid separator (120) through the second flow path (702). The potassium solid-liquid separator (120) can separate the potassium chloride and the first solution by centrifugal force by rotating the potassium chloride and the first solution.

[0038] The potassium washing tank (130) can wash potassium chloride. This potassium washing tank (130) can be connected to the potassium solid-liquid separator (120) through the third passage (703) of the passage module (700) described below. In other words, potassium chloride can be supplied to the potassium washing tank (130) through the third passage (703). The potassium chloride supplied to the potassium washing tank (130) can be washed multiple times with a washing solution provided as ethanol or an organic solvent. In this way, as the potassium chloride is washed multiple times with the washing solution, the purity of the potassium chloride can be increased.

[0039] The potassium dryer (140) can dry potassium chloride. This potassium dryer (140) can be connected to the potassium washing tank (130) through the fourth flow path (704) of the flow path module (700), which will be described later. In other words, washed potassium chloride can be supplied to the potassium dryer (140) through the fourth flow path (704). The potassium chloride can be dried and recovered by the potassium dryer (140). In this way, the recovered potassium chloride can be used as a fertilizer, etc., necessary for plant growth.

[0040] A magnesium recovery module (200) can recover magnesium from wastewater. The magnesium recovery module (200) can include a magnesium mixing tank (210), a magnesium solid-liquid separator (220), a magnesium separation membrane tank (230), a magnesium washing tank (240), a magnesium dryer (250), and a heat treatment furnace (260).

[0041] The magnesium mixing tank (210) can produce a second solution by mixing a first solution and sodium hydroxide. A receiving space for receiving the first solution and sodium hydroxide can be provided inside the magnesium mixing tank (210), and a mixing means for mixing the first solution and sodium hydroxide to produce a second solution can be arranged inside the receiving space. The magnesium mixing tank (210) can be connected to the cooling tank (110) through the fifth channel (705) of the flow module (700), which will be described later. In other words, the first solution can be supplied to the magnesium mixing tank (210) through the fifth channel (705). In addition, the magnesium mixing tank (210) can be connected to the sodium hydroxide storage tank (500) through the twelfth channel (712) of the flow module (700), which will be described later. In other words, sodium hydroxide can be supplied to the magnesium mixing tank (210) through the 12th passage (712). The sodium hydroxide supplied to the magnesium mixing tank (210) can have a concentration of 1M to 4M depending on the concentration of the wastewater. The sodium hydroxide supplied to the magnesium mixing tank (210) can be supplied until the pH of the magnesium mixing tank (210) reaches a range of 10 to 12. In this way, when the first solution and sodium hydroxide are supplied to the magnesium mixing tank (210), the mixing means can be operated to mix the first solution and sodium hydroxide to produce a second solution.

[0042] The magnesium solid-liquid separator (220) can separate solid magnesium hydroxide and a third solution from the second solution. This magnesium solid-liquid separator (220) can be connected to the magnesium mixing tank (210) through the sixth flow path (706) of the flow path module (700) described below. In other words, the second solution can be supplied to the magnesium solid-liquid separator (220) through the sixth flow path (706). The magnesium solid-liquid separator (220) can separate the magnesium hydroxide and the third solution by rotating the second solution and applying centrifugal force.

[0043] The magnesium separation membrane tank (230) can separate the magnesium hydroxide remaining in the third solution and the fourth solution from the third solution. This magnesium separation membrane tank (230) can be connected to the magnesium solid-liquid separator (220) through the 10th flow path (710) of the flow path module (700) described below. In other words, the third solution can be supplied to the magnesium separation membrane tank (230) through the 10th flow path (710). A separation membrane having a plurality of holes with a size of 0.05 μm to 0.5 μm is arranged inside the magnesium separation membrane tank (230) so as to separate the magnesium hydroxide remaining in the third solution from the third solution to generate the fourth solution. In addition, the magnesium separation membrane tank (230) can be connected to the seventh flow path (707) of the euro module (700) via the eleventh flow path (711) of the euro module (700) described below. In other words, the magnesium hydroxide separated in the magnesium separation membrane tank (230) can be supplied to the seventh flow path (707) via the eleventh flow path (711).

[0044] The magnesium washing tank (240) can wash magnesium hydroxide. This magnesium washing tank (240) can be connected to the magnesium solid-liquid separator (220) through the seventh passage (707) of the passage module (700). In other words, the magnesium hydroxide produced in the magnesium solid-liquid separator (220) and the magnesium separation membrane tank (230) can be supplied to the magnesium washing tank (240) through the seventh passage (707). The magnesium hydroxide supplied to the magnesium washing tank (240) can be washed multiple times with a washing solution containing sodium chloride. In this way, as the magnesium hydroxide is washed multiple times with the washing solution, the purity of the magnesium hydroxide can be increased.

[0045] The magnesium dryer (250) can dry magnesium hydroxide. This magnesium dryer (250) can be connected to the magnesium washing tank (240) through the 8th flow path (708) of the flow path module (700), which will be described later. In other words, the washed magnesium hydroxide can be supplied to the magnesium dryer (250) through the 8th flow path (708). In this way, the magnesium hydroxide supplied to the magnesium dryer (250) can be dried at 100°C to 120°C.

[0046] The heat treatment furnace (260) can heat-treat magnesium hydroxide to produce magnesium oxide. This heat treatment furnace (260) can be connected to the magnesium dryer (250) through the ninth passage (709) of the passage module (700) described below. In other words, dried magnesium hydroxide can be supplied to the heat treatment furnace (260) through the ninth passage (709). In this way, the magnesium hydroxide supplied to the heat treatment furnace (260) can be heat-treated at 450°C to 550°C for 1 hour or more. As the magnesium hydroxide is heat-treated in the heat treatment furnace (260), it can be converted into magnesium oxide having a particle size of 30 nm to 500 nm and recovered. The recovered magnesium oxide can be used as cement, refractory bricks, etc.

[0047] A calcium recovery module (300) can recover calcium from wastewater. This calcium recovery module (300) can include a calcium mixing tank (310), a calcium solid-liquid separator (320), a calcium separation membrane tank (330), and a calcium dryer (340).

[0048] The calcium mixing tank (310) can produce a fifth solution by mixing the fourth solution, sodium hydroxide, and carbon dioxide. A receiving space for receiving the fourth solution, sodium hydroxide, and carbon dioxide can be provided inside the calcium mixing tank (310), and a mixing means for mixing the fourth solution, sodium hydroxide, and carbon dioxide to produce the fifth solution can be arranged inside the receiving space. The calcium mixing tank (310) can be connected to the magnesium separation membrane tank (230) through the 13th flow path (713) of the flow module (700), which will be described later. In other words, the fourth solution can be supplied to the calcium mixing tank (310) through the 13th flow path (713). In addition, the calcium mixing tank (310) can be connected to the sodium hydroxide storage tank (500) through the 14th flow path (714) of the flow module (700), which will be described later. In other words, sodium hydroxide can be supplied to the calcium mixing tank (310) through the 14th flow path (714). In addition, the calcium mixing tank (310) can be connected to the carbon dioxide storage tank (600) through the 19th flow path (719) of the flow module (700), which will be described later. In other words, carbon dioxide can be supplied to the calcium mixing tank (310) through the 19th flow path (719).

[0049] The sodium hydroxide supplied to the calcium mixing tank (310) may be sodium hydroxide having a concentration of 1M to 4M depending on the concentration of the wastewater. When the fourth solution is supplied to the calcium mixing tank (310), sodium hydroxide may be supplied to the calcium mixing tank (310). The sodium hydroxide supplied to the calcium mixing tank (310) may be supplied until the pH of the calcium mixing tank (310) reaches a range of 13. When the pH of the calcium mixing tank (310) reaches a range of 13, the mixing means may be operated to mix the fourth solution and sodium hydroxide for a preset period of time. When the fourth solution and sodium hydroxide are mixed for a preset period of time, carbon dioxide may be supplied to the calcium mixing tank (310). The concentration of carbon dioxide supplied to the calcium mixing tank (310) may be 1% to 50%, and carbon dioxide may be supplied to the calcium mixing tank (310) until the pH of the calcium mixing tank (310) reaches 10 or lower, thereby generating the fifth solution.

[0050] The calcium solid-liquid separator (320) can separate solid calcium carbonate and the sixth solution from the fifth solution. This calcium solid-liquid separator (320) can be connected to the calcium mixing tank (310) through the 15th flow path (715) of the flow path module (700), which will be described later. In other words, the fifth solution can be supplied to the calcium solid-liquid separator (320) through the 15th flow path (715). The calcium solid-liquid separator (320) can separate calcium carbonate and the sixth solution by rotating the fifth solution and applying centrifugal force.

[0051] The calcium separation membrane tank (330) can separate calcium carbonate remaining in the sixth solution from the seventh solution. This calcium separation membrane tank (330) can be connected to the calcium solid-liquid separator (320) through the 17th flow path (717) of the flow path module (700) described below. In other words, the sixth solution can be supplied to the calcium separation membrane tank (330) through the 17th flow path (717). A separation membrane having a plurality of holes with a size of 0.05 μm to 0.5 μm is arranged inside the calcium separation membrane tank (330) so as to separate calcium carbonate remaining in the sixth solution from the sixth solution to generate the seventh solution. In addition, the calcium separation membrane tank (330) can be connected to the 16th flow path (716) of the euro module (700) via the 18th flow path (718) of the euro module (700) described below. In other words, calcium carbonate separated in the calcium separation membrane tank (330) can be supplied to the 16th flow path (716) via the 18th flow path (718).

[0052] The calcium dryer (340) can dry calcium carbonate. This calcium dryer (340) can be connected to the calcium solid-liquid separator (320) through the 16th flow path (716) of the flow path module (700). In other words, calcium carbonate produced in the calcium solid-liquid separator (320) and the calcium separation membrane tank (330) can be supplied to the calcium dryer (340) through the 16th flow path (716). In this way, the calcium carbonate supplied to the calcium dryer (340) can be dried at 100°C to 120°C and recovered. The purity of the recovered calcium carbonate is 95% or higher and can be used as a building material, etc.

[0053] A sodium recovery module (400) can recover sodium from wastewater. This sodium recovery module (400) can include an electrolysis unit (410), a sodium solid-liquid separator (420), and a sodium dryer (430).

[0054] Referring to FIG. 3, the electrolysis unit (410) can electrolyze the seventh solution to generate sodium ions and chlorine ions, and supply carbon dioxide to generate the eighth solution containing sodium bicarbonate. This electrolysis unit (410) can include a solution receiving tank (411), a sodium ion recovery tank (412), a chlorine ion recovery tank (413), a hydrogen gas collection unit (414), a chlorine gas collection unit (415), and a water storage tank (416).

[0055] The solution receiving tank (411) can receive the seventh solution. A receiving space for receiving the seventh solution can be provided in the solution receiving tank (411). The solution receiving tank (411) can be connected to the calcium separation membrane tank (330) through the 20th flow path (720) of the flow module (700) described below. In other words, the seventh solution can be supplied to the solution receiving tank (411) through the 20th flow path (720). The 20th flow path (720) can be connected to the magnesium washing tank (240) through the 21st flow path (721) of the flow module (700) described below. In other words, a washing solution containing sodium chloride discharged from the magnesium washing tank (240) can be supplied to the 20th flow path (720) through the 21st flow path (721). In this way, by supplying a washing solution containing sodium chloride to the 20th euro (720), the seventh solution may contain sodium chloride. The sodium ion concentration of the seventh solution supplied to the solution tank (411) may be at the level of 30,000 ppm.

[0056] The sodium ion recovery tank (412) may be disposed on one side of the solution receiving tank (411) and may include a cation separation membrane (412-1) disposed between the solution receiving tank (411) and a cathode electrode (412-2) disposed inside the sodium ion recovery tank (412) to apply current. The sodium ion recovery tank (412) may be connected to the carbon dioxide storage tank (600) via the 22nd flow path (722) of the flow path module (700), which will be described later. In other words, carbon dioxide may be supplied to the sodium ion recovery tank (412) via the 22nd flow path (722). As the cathode electrode (412-2) applies current, hydrogen ions and sodium ions from the solution receiving tank (411) pass through the cation separation membrane (412-1) and move to the sodium ion recovery tank (412), and the moved hydrogen ions and sodium ions are mixed with carbon dioxide, thereby generating an eighth solution containing hydrogen gas and sodium bicarbonate.

[0057] The chlorine ion recovery tank (413) may be disposed on the other side of the solution receiving tank (411) and may include an anion separation membrane (413-1) disposed between the solution receiving tank (411) and an anode electrode (413-2) disposed inside the chlorine ion recovery tank (413) to which current is applied. As the anode electrode (413-2) applies current, chlorine ions from the solution receiving tank (411) may pass through the anion separation membrane (413-1) and move to the chlorine ion recovery tank (413), thereby generating chlorine gas.

[0058] The hydrogen gas collection unit (414) can collect hydrogen gas generated in the sodium ion recovery tank (412). This hydrogen gas collection unit (414) can be connected to the sodium ion recovery tank (412) through the 25th flow path (725) of the flow path module (700) described below. In other words, hydrogen gas can be supplied to the hydrogen gas collection unit (414) through the 25th flow path (725) and collected.

[0059] The chlorine gas collection unit (415) can collect chlorine gas generated in the chlorine ion recovery tank (413). This chlorine gas collection unit (415) can be connected to the chlorine ion recovery tank (413) through the 26th flow path (726) of the flow path module (700), which will be described later. In other words, chlorine gas can be supplied to the chlorine gas collection unit (415) through the 26th flow path (726) and collected.

[0060] The water storage tank (416) can store water supplied to the sodium ion recovery tank (412) and the chlorine ion recovery tank (413). The water storage tank (416) can be connected to the sodium ion recovery tank (412) through the 33rd flow path (733) of the flow module (700) described below. In other words, water from the water storage tank (416) can be supplied to the sodium ion recovery tank (412) through the 33rd flow path (733). In addition, the water storage tank (416) can be connected to the chlorine ion recovery tank (413) through the 34th flow path (734) of the flow module (700) described below. In other words, water from the water storage tank (416) can be supplied to the chlorine ion recovery tank (413) through the 34th flow path (734). In addition, the water storage tank (416) can be connected to the solution receiving tank (411) through the 29th flow path (729) of the flow module (700) described below. In other words, water from the solution receiving tank (411) can be supplied to the water storage tank (416) through the 29th flow path (729). In addition, the water storage tank (416) can be connected to the chlorine ion recovery tank (413) through the 30th flow path (730) of the flow module (700) described below. In other words, water from the chlorine ion recovery tank (413) can be supplied to the water storage tank (416) through the 30th flow path (730). In addition, the water storage tank (416) can be connected to the sodium solid-liquid separator (420) through the 31st flow path (731) and the 32nd flow path (732) of the flow module (700) described below. In other words, water generated in the sodium solid-liquid separator (420) can be supplied and stored in the water storage tank (416) through the 31st flow path (731) and the 32nd flow path (732).

[0061] The sodium solid-liquid separator (420) can separate the eighth solution to produce sodium bicarbonate and water. This sodium solid-liquid separator (420) can be connected to the sodium ion recovery tank (412) through the 27th flow path (727) of the flow path module (700) described below. In other words, the eighth solution containing sodium bicarbonate can be supplied to the sodium solid-liquid separator (420) through the 27th flow path (727). The sodium solid-liquid separator (420) can separate sodium bicarbonate and water by centrifugal force by rotating the eighth solution.

[0062] The sodium dryer (430) can dry sodium bicarbonate. This sodium dryer (430) can be connected to the sodium solid-liquid separator (420) through the 28th flow path (728) of the flow module (700) described below. In other words, sodium bicarbonate can be supplied to the sodium dryer (430) through the 28th flow path (728). In this way, the sodium bicarbonate supplied to the sodium dryer (430) can be dried at 100°C to 120°C and recovered. The recovered sodium bicarbonate can be used as a fire extinguisher, a metal surface treatment agent, etc.

[0063] The sodium hydroxide storage tank (500) can store sodium hydroxide supplied to the magnesium mixing tank (210) and the calcium mixing tank (310). A storage space for storing sodium hydroxide can be provided in the sodium hydroxide storage tank (500). The sodium hydroxide storage tank (500) can be connected to the magnesium mixing tank (210) through the 12th passage (712) and to the calcium mixing tank (310) through the 14th passage (714). In other words, the sodium hydroxide stored in the sodium hydroxide storage tank (500) can be supplied to the magnesium mixing tank (210) through the 12th passage (712) and to the calcium mixing tank (310) through the 14th passage (714).

[0064] The carbon dioxide storage tank (600) can store carbon dioxide supplied to the calcium mixing tank (310) and the sodium ion recovery tank (412). A storage space for storing carbon dioxide can be provided in the carbon dioxide storage tank (600). The carbon dioxide storage tank (600) can be connected to the calcium mixing tank (310) through the 19th passage (719) and to the sodium ion recovery tank (412) through the 22nd passage (722). In other words, the carbon dioxide stored in the carbon dioxide storage tank (600) can be supplied to the calcium mixing tank (310) through the 19th passage (719) and to the sodium ion recovery tank (412) through the 22nd passage (722).

[0065] The euro module (700) may include one or more passages that are connected to a potassium recovery module (100), a magnesium recovery module (200), a calcium recovery module (300), a sodium recovery module (400), a sodium hydroxide storage tank (500), and a carbon dioxide storage tank (600) and provide a passage through which one or more of potassium chloride, sodium hydroxide, magnesium hydroxide, carbon dioxide, calcium carbonate, sodium bicarbonate, a solution, and water flows. These Euro modules (700) are the 1st Euro (701), the 2nd Euro (702), the 3rd Euro (703), the 4th Euro (704), the 5th Euro (705), the 6th Euro (706), the 7th Euro (707), the 8th Euro (708), the 9th Euro (709), the 10th Euro (710), the 11th Euro (711), the 12th Euro (712), the 13th Euro (713), the 14th Euro (714), the 15th Euro (715), the 16th Euro (716), the 17th Euro (717), the 18th Euro (718), the 19th Euro (719), the 20th Euro (720), the 21st Euro (721), the 22nd Euro (722), the 25th Euro (725), the 26th Euro (726), the 27th Euro (727), the 28th Euro (728), the 29th It may include the Euro (729), the 30th Euro (730), the 31st Euro (731), the 32nd Euro (732), the 33rd Euro (733) and the 34th Euro (734).

[0066] The first flow path (701) may provide a passage through which the waste water flows so that the waste water flows into the cooling tank (110). This first flow path (701) may be connected to the cooling tank (110). In other words, the waste water may flow into the cooling tank (110) through the first flow path (701).

[0067] The second flow path (702) may provide a passage through which potassium chloride and a small amount of the first solution may flow in the cooling tank (110) to the potassium solid-liquid separator (120). This second flow path (702) may be connected to the cooling tank (110) and the potassium solid-liquid separator (120). In other words, the potassium chloride and a small amount of the first solution in the cooling tank (110) may flow to the potassium solid-liquid separator (120) through the second flow path (702).

[0068] The third flow path (703) can provide a passage through which potassium chloride flows so that the potassium chloride of the potassium solid-liquid separator (120) flows into the potassium washing tank (130). This third flow path (703) can be connected to the potassium solid-liquid separator (120) and the potassium washing tank (130). In other words, the potassium chloride of the potassium solid-liquid separator (120) can flow into the potassium washing tank (130) through the third flow path (703).

[0069] The fourth flow path (704) may provide a passage through which potassium chloride flows so that the potassium chloride in the potassium washing tank (130) flows to the potassium dryer (140). This fourth flow path (704) may be connected to the potassium washing tank (130) and the potassium dryer (140). In other words, the potassium chloride in the potassium washing tank (130) may flow to the potassium dryer (140) through the fourth flow path (704).

[0070] The fifth passage (705) can provide a passage through which the first solution of the cooling tank (110) flows to the magnesium mixing tank (210). This fifth passage (705) can be connected to the cooling tank (110) and the magnesium mixing tank (210). In other words, the first solution of the cooling tank (110) can flow to the magnesium mixing tank (210) through the fifth passage (705).

[0071] The sixth passage (706) may provide a passage through which the second solution of the magnesium mixing tank (210) flows to the magnesium solid-liquid separator (220). This sixth passage (706) may be connected to the magnesium mixing tank (210) and the magnesium solid-liquid separator (220). In other words, the second solution of the magnesium mixing tank (210) may flow to the magnesium solid-liquid separator (220) through the sixth passage (706).

[0072] The seventh passage (707) may provide a passage through which the magnesium hydroxide of the magnesium solid-liquid separator (220) flows to the magnesium washing tank (240). This seventh passage (707) may be connected to the magnesium solid-liquid separator (220) and the magnesium washing tank (240). In other words, the magnesium hydroxide of the magnesium solid-liquid separator (220) may flow to the magnesium washing tank (240) through the seventh passage (707).

[0073] The eighth flow path (708) may provide a passage through which the magnesium hydroxide in the magnesium washing tank (240) flows to the magnesium dryer (250). This eighth flow path (708) may be connected to the magnesium washing tank (240) and the magnesium dryer (250). In other words, the magnesium hydroxide in the magnesium washing tank (240) may flow to the magnesium dryer (250) through the eighth flow path (708).

[0074] The ninth passage (709) may provide a passage through which the magnesium hydroxide of the magnesium dryer (250) flows to the heat treatment furnace (260). This ninth passage (709) may be connected to the magnesium dryer (250) and the heat treatment furnace (260). In other words, the magnesium hydroxide of the magnesium dryer (250) may flow to the heat treatment furnace (260) through the ninth passage (709).

[0075] The 10th flow path (710) may provide a passage through which the third solution of the magnesium solid-liquid separator (220) flows to the magnesium separation membrane tank (230). This 10th flow path (710) may be connected to the magnesium solid-liquid separator (220) and the magnesium separation membrane tank (230). In other words, the third solution of the magnesium solid-liquid separator (220) may flow to the magnesium separation membrane tank (230) through the 10th flow path (710).

[0076] The eleventh passage (711) may provide a passage through which the magnesium hydroxide in the magnesium separation membrane tank (230) flows to the seventh passage (707). This eleventh passage (711) may be connected to the magnesium separation membrane tank (230) and the seventh passage (707). In other words, the magnesium hydroxide in the magnesium separation membrane tank (230) may flow to the seventh passage (707) through the eleventh passage (711).

[0077] The 12th passage (712) can provide a passage through which sodium hydroxide flows so that the sodium hydroxide in the sodium hydroxide storage tank (500) flows into the magnesium mixing tank (210). This 12th passage (712) can be connected to the sodium hydroxide storage tank (500) and the magnesium mixing tank (210). In other words, the sodium hydroxide in the sodium hydroxide storage tank (500) can flow into the magnesium mixing tank (210) through the 12th passage (712).

[0078] The 13th flow path (713) can provide a passage through which the fourth solution of the magnesium separation membrane tank (230) flows to the calcium mixing tank (310). This 13th flow path (713) can be connected to the magnesium separation membrane tank (230) and the calcium mixing tank (310). In other words, the fourth solution of the magnesium separation membrane tank (230) can flow to the calcium mixing tank (310) through the 13th flow path (713).

[0079] The 14th passage (714) can provide a passage through which sodium hydroxide flows so that the sodium hydroxide in the sodium hydroxide storage tank (500) flows to the calcium mixing tank (310). This 14th passage (714) can be connected to the sodium hydroxide storage tank (500) and the calcium mixing tank (310). In other words, the sodium hydroxide in the sodium hydroxide storage tank (500) can flow to the calcium mixing tank (310) through the 14th passage (714).

[0080] The 15th flow path (715) can provide a passage through which the 5th solution of the calcium mixing tank (310) flows to the calcium solid-liquid separator (320). This 15th flow path (715) can be connected to the calcium mixing tank (310) and the calcium solid-liquid separator (320). In other words, the 5th solution of the calcium mixing tank (310) can flow to the calcium solid-liquid separator (320) through the 15th flow path (715).

[0081] The 16th flow path (716) may provide a passage through which calcium carbonate flows so that the calcium carbonate of the calcium solid-liquid separator (320) flows to the calcium dryer (340). This 16th flow path (716) may be connected to the calcium solid-liquid separator (320) and the calcium dryer (340). In other words, the calcium carbonate of the calcium solid-liquid separator (320) may flow to the calcium dryer (340) through the 16th flow path (716).

[0082] The 17th flow path (717) may provide a passage through which the 6th solution of the calcium solid-liquid separator (320) flows to the calcium separation membrane tank (330). This 17th flow path (717) may be connected to the calcium solid-liquid separator (320) and the calcium separation membrane tank (330). In other words, the 6th solution of the calcium solid-liquid separator (320) may flow to the calcium separation membrane tank (330) through the 17th flow path (717).

[0083] The 18th flow path (718) may provide a passage through which calcium carbonate flows so that the calcium carbonate in the calcium separation membrane tank (330) flows to the 16th flow path (716). The 18th flow path (718) may be connected to the calcium separation membrane tank (330) and the 16th flow path (716). In other words, the calcium carbonate in the calcium separation membrane tank (330) may flow to the 16th flow path (716) through the 18th flow path (718).

[0084] The 19th passage (719) can provide a passage through which carbon dioxide flows so that carbon dioxide in the carbon dioxide storage tank (600) flows into the calcium mixing tank (310). This 19th passage (719) can be connected to the carbon dioxide storage tank (600) and the calcium mixing tank (310). In other words, carbon dioxide in the carbon dioxide storage tank (600) can flow into the calcium mixing tank (310) through the 19th passage (719).

[0085] The 20th flow path (720) can provide a passage through which the 7th solution of the calcium separation membrane tank (330) flows to the solution receiving tank (411). This 20th flow path (720) can be connected to the calcium separation membrane tank (330) and the solution receiving tank (411). In other words, the 7th solution of the calcium separation membrane tank (330) can flow to the solution receiving tank (411) through the 20th flow path (720).

[0086] The 21st flow path (721) may provide a passage for the cleaning liquid to flow from the magnesium cleaning tank (240) to the 20th flow path (720). This 21st flow path (721) may be connected to the magnesium cleaning tank (240) and the 20th flow path (720). In other words, the cleaning liquid from the magnesium cleaning tank (240) may flow to the 20th flow path (720) through the 21st flow path (721).

[0087] The 22nd flow path (722) can provide a passage for carbon dioxide to flow from the carbon dioxide storage tank (600) to the sodium ion recovery tank (412). This 22nd flow path (722) can be connected to the carbon dioxide storage tank (600) and the sodium ion recovery tank (412). In other words, the carbon dioxide from the carbon dioxide storage tank (600) can flow to the sodium ion recovery tank (412) through the 22nd flow path (722).

[0088] The 25th flow path (725) can provide a passage through which hydrogen gas flows so that the hydrogen gas in the sodium ion recovery tank (412) flows to the hydrogen gas collection unit (414). This 25th flow path (725) can be connected to the sodium ion recovery tank (412) and the hydrogen gas collection unit (414). In other words, the hydrogen gas in the sodium ion recovery tank (412) can flow to the hydrogen gas collection unit (414) through the 25th flow path (725).

[0089] The 26th flow path (726) can provide a passage through which the chlorine gas of the chlorine ion recovery tank (413) flows to the chlorine gas collection unit (415). This 26th flow path (726) can be connected to the chlorine ion recovery tank (413) and the chlorine gas collection unit (415). In other words, the chlorine gas of the chlorine ion recovery tank (413) can flow to the chlorine gas collection unit (415) through the 26th flow path (726).

[0090] The 27th flow path (727) may provide a passage through which the 8th solution of the sodium ion recovery tank (412) flows to the sodium solid-liquid separator (420). This 27th flow path (727) may be connected to the sodium ion recovery tank (412) and the sodium solid-liquid separator (420). In other words, the 8th solution of the sodium ion recovery tank (412) may flow to the sodium solid-liquid separator (420) through the 27th flow path (727).

[0091] The 28th flow path (728) may provide a passage through which sodium bicarbonate flows so that the sodium bicarbonate of the sodium solid-liquid separator (420) flows to the sodium dryer (430). The 28th flow path (728) may be connected to the sodium solid-liquid separator (420) and the sodium dryer (430). In other words, the sodium bicarbonate of the sodium solid-liquid separator (420) may flow to the sodium dryer (430) through the 28th flow path (728).

[0092] The 29th flow path (729) may provide a passage for water to flow from the solution tank (411) to the water storage tank (416). This 29th flow path (729) may be connected to the solution tank (411) and the water storage tank (416). In other words, the water from the solution tank (411) may flow to the water storage tank (416) through the 29th flow path (729).

[0093] The 30th flow path (730) can provide a water flow path so that water from the chlorine ion recovery tank (413) can flow into the water storage tank (416). The 30th flow path (730) can be connected to the chlorine ion recovery tank (413) and the water storage tank (416). In other words, water from the chlorine ion recovery tank (413) can flow into the water storage tank (416) through the 30th flow path (730).

[0094] The 31st flow path (731) can provide a passage for water to flow from the sodium solid-liquid separator (420) to the magnesium washing tank (240). This 31st flow path (731) can be connected to the sodium solid-liquid separator (420) and the magnesium washing tank (240). In other words, the water from the sodium solid-liquid separator (420) can flow to the magnesium washing tank (240) through the 31st flow path (731).

[0095] The 32nd flow path (732) may provide a passage for water to flow from the sodium solid-liquid separator (420) to the water storage tank (416). The 32nd flow path (732) may be connected to the 31st flow path (731) and the water storage tank (416). In other words, the water from the sodium solid-liquid separator (420) may flow to the water storage tank (416) through the 31st flow path (731) and the 32nd flow path (732).

[0096] The 33rd flow path (733) may provide a passage for water to flow from the water storage tank (416) to the sodium ion recovery tank (412). This 33rd flow path (733) may be connected to the water storage tank (416) and the sodium ion recovery tank (412). In other words, the water from the water storage tank (416) may flow to the sodium ion recovery tank (412) through the 33rd flow path (733).

[0097] The 34th flow path (734) may provide a passage for water to flow from the water storage tank (416) to the chlorine ion recovery tank (413). The 34th flow path (734) may be connected to the water storage tank (416) and the chlorine ion recovery tank (413). In other words, the water from the water storage tank (416) may flow to the chlorine ion recovery tank (413) through the 34th flow path (734).

[0098] Hereinafter, the operation and effect of the wastewater resource recovery device (10) according to one embodiment of the present invention will be described.

[0099] A wastewater resource recovery device (10) according to one embodiment of the present invention can recover not only magnesium and calcium but also potassium and sodium from wastewater, and has the effect of improving the purity of the recovered resources.

[0100] Additionally, there is an effect that can produce hydrogen gas and chlorine gas in the process of recovering resources from wastewater.

[0101] Although the embodiments of the present invention have been described as specific embodiments, these are merely examples, and the present invention is not limited thereto, but should be construed to have the broadest scope in accordance with the technical concepts disclosed in this specification. Those skilled in the art may combine / substitute the disclosed embodiments to implement patterns of shapes not specified, but this also does not depart from the scope of the present invention. In addition, those skilled in the art may easily modify or alter the disclosed embodiments based on this specification, and it is clear that such modifications or alterations also fall within the scope of the present invention.

Claims

1. A potassium recovery module including a cooling tank that cools wastewater to separate potassium chloride from the wastewater and generates a first solution in which potassium chloride is separated from the wastewater; A magnesium recovery module comprising a magnesium mixing tank that mixes the first solution and sodium hydroxide to produce a second solution, a magnesium solid-liquid separator that separates the second solution into a solid magnesium hydroxide and a third solution, and a magnesium separation membrane tank that separates the remaining magnesium hydroxide and a fourth solution from the third solution; A calcium recovery module including a calcium mixing tank that mixes the fourth solution, sodium hydroxide, and carbon dioxide to produce a fifth solution, a calcium solid-liquid separator that separates the fifth solution into solid calcium carbonate and a sixth solution, and a calcium separation membrane tank that separates the remaining calcium carbonate from the sixth solution and a seventh solution; A sodium recovery module including an electrolysis unit that electrolyzes the seventh solution to generate sodium ions and chloride ions and supplies carbon dioxide to generate an eighth solution containing sodium bicarbonate, and a sodium solid-liquid separator that separates the eighth solution into sodium bicarbonate and water; and Including a flow path module including at least one flow path that is connected to the potassium recovery module, the magnesium recovery module, the calcium recovery module and the sodium recovery module and provides a passage through which at least one of the potassium chloride, the sodium hydroxide, the magnesium hydroxide, the carbon dioxide, the calcium carbonate, the sodium bicarbonate, the solution and the water flows. Resource recovery device for waste water treatment plants.

2. In paragraph 1, The above potassium recovery module, A potassium solid-liquid separator that supplies the potassium chloride and the first solution from the cooling tank and separates the potassium chloride and the first solution; A potassium washing tank that supplies potassium chloride from the potassium solid-liquid separator and washes the supplied potassium chloride; and The potassium chloride washed from the potassium washing tank is supplied, and further includes a potassium dryer for drying the supplied potassium chloride. Resource recovery device for waste water treatment plants.

3. In paragraph 2, The above Euro module is, A first passage connected to the cooling tank and providing a passage through which the waste water flows into the cooling tank; A second passage connected to the cooling tank and the potassium solid-liquid separator and providing a passage through which the potassium chloride and the first solution flow; A third flow path connected to the potassium solid-liquid separator and the potassium washing tank and providing a passage through which the potassium chloride flows; and Including a fourth passage connected to the potassium washing tank and the potassium dryer and providing a passage through which the potassium chloride flows. Resource recovery device for waste water treatment plants.

4. In paragraph 1, The above magnesium recovery module is, A magnesium washing tank that supplies the magnesium hydroxide from the magnesium solid-liquid separator and the magnesium separation membrane tank and washes the supplied magnesium hydroxide; A magnesium dryer that supplies the magnesium hydroxide washed from the magnesium washing tank and dries the supplied magnesium hydroxide; and The dried magnesium hydroxide from the magnesium dryer is supplied, and a heat treatment furnace is further included for heat-treating the supplied magnesium hydroxide to produce magnesium oxide. Resource recovery device for waste water treatment plants.

5. In paragraph 4, The above Euro module is, A fifth passage connected to the cooling tank and the magnesium mixing tank and providing a passage through which the first solution flows; A sixth flow path connected to the magnesium mixing tank and the magnesium solid-liquid separator and providing a passage through which the second solution flows; A seventh flow path connected to the magnesium solid-liquid separator and the magnesium washing tank and providing a passage through which the magnesium hydroxide flows; An 8th passage connected to the magnesium washing tank and the magnesium dryer and providing a passage through which the magnesium hydroxide flows; A ninth passage connected to the magnesium dryer and the heat treatment furnace to provide a passage through which the magnesium hydroxide flows; A 10th flow path connected to the above magnesium solid-liquid separator and the above magnesium separation membrane tank and providing a passage through which the third solution flows; An 11th flow path connected to the magnesium separator and the 7th flow path and providing a passage through which the magnesium hydroxide flows; A 21st passage connected to the magnesium washing tank and the electrolysis unit and providing a passage through which the washing liquid of the magnesium washing tank flows; and Including a 31st flow path connected to the sodium solid-liquid separator and the magnesium washing tank and providing a passage through which the water flows. Resource recovery device for waste water treatment plants.

6. In paragraph 1, The above calcium recovery module, The calcium carbonate is supplied from the calcium solid-liquid separator and the calcium separation membrane tank, and further includes a calcium dryer for drying the supplied calcium carbonate. Resource recovery device for waste water treatment plants.

7. In paragraph 6, The above Euro module is, A 13th flow path connected to the magnesium separation membrane tank and the calcium mixing tank and providing a passage through which the fourth solution flows; A 15th passage connected to the calcium mixing tank and the calcium solid-liquid separator and providing a passage through which the fifth solution flows; A 16th flow path connected to the calcium solid-liquid separator and the calcium dryer and providing a passage through which the calcium carbonate flows; A 17th flow path connected to the calcium solid-liquid separator and the calcium separation membrane tank and providing a passage through which the sixth solution flows; and Including the calcium separation membrane tank and the 18th flow path connected to the 16th flow path and providing a passage through which the calcium carbonate flows. Resource recovery device for waste water treatment plants.

8. In paragraph 1, The above electrolysis unit, A solution tank in which the above seventh solution is accommodated; A sodium ion recovery tank, which is disposed on one side of the solution tank, supplies carbon dioxide, and includes a cation separation membrane disposed between the solution tank and a cathode electrode for applying current; and A chloride ion recovery tank is disposed on the other side of the solution tank and includes an anion separation membrane disposed between the solution tank and an anode electrode for applying current. As the cathode electrode applies current, hydrogen ions and sodium ions from the solution tank move to the sodium ion recovery tank through the cation separation membrane and mix with carbon dioxide, thereby generating hydrogen gas and the sodium bicarbonate. As the anode electrode applies current, chlorine ions from the solution tank move to the chlorine ion recovery tank through the anion separation membrane, thereby generating chlorine gas. Resource recovery device for waste water treatment plants.

9. In paragraph 8, The above electrolysis unit, A hydrogen gas collection unit that collects hydrogen gas generated in the above sodium ion recovery tank; and Further comprising a chlorine gas collection unit for collecting chlorine gas generated in the above chlorine ion recovery tank. Resource recovery device for waste water treatment plants.

10. In paragraph 9, The above electrolysis unit, It further includes a water storage tank in which water supplied to the sodium ion recovery tank and the chloride ion recovery tank is stored, The above water storage tank is supplied with and stores water generated by the sodium solid-liquid separator, water inside the solution tank, and water inside the chloride ion recovery tank. Resource recovery device for waste water treatment plants.

11. In paragraph 10, The above sodium recovery module, The sodium bicarbonate is supplied from the sodium solid-liquid separator, and further includes a sodium dryer for drying the supplied sodium bicarbonate. Resource recovery device for waste water treatment plants.

12. In paragraph 11, The above Euro module is, A 20th flow path connected to the calcium separation membrane tank and the solution receiving tank and providing a passage through which the 7th solution flows; A 25th passage connected to the sodium ion recovery tank and the hydrogen gas collection unit to provide a passage through which the hydrogen gas flows; A 26th passage connected to the above chlorine ion recovery tank and the above chlorine gas collection unit and providing a passage through which the chlorine gas flows; A 27th passage connected to the sodium ion recovery tank and the sodium solid-liquid separator and providing a passage through which the 8th solution flows; A 28th flow path connected to the sodium solid-liquid separator and the sodium dryer and providing a passage through which the sodium bicarbonate flows; A 29th flow path connected to the solution tank and the water storage tank and providing a passage through which the water flows; A 30-way pipe connected to the above-mentioned chlorine ion recovery tank and the above-mentioned water storage tank and providing a passage for water inside the above-mentioned chlorine ion recovery tank to flow into the above-mentioned water storage tank; A 32nd passage connected to the water storage tank and providing a passage for water produced in the sodium solid-liquid separator to flow into the water storage tank; A 33rd passage connected to the water storage tank and the sodium ion recovery tank to provide a passage for the water stored in the water storage tank to flow to the sodium ion recovery tank; and Including a 34th passage connected to the water storage tank and the chlorine ion recovery tank and providing a passage for the water stored in the water storage tank to flow to the chlorine ion recovery tank. Resource recovery device for waste water treatment plants.

13. In paragraph 1, Further comprising a sodium hydroxide storage tank in which sodium hydroxide supplied to the magnesium mixing tank and the calcium mixing tank is stored. Resource recovery device for waste water treatment plants.

14. In paragraph 13, The above Euro module is, A 12th passage connected to the magnesium mixing tank and the sodium hydroxide storage tank to provide a passage through which the sodium hydroxide flows; and Including a 14th passage connected to the calcium mixing tank and the sodium hydroxide storage tank and providing a passage through which the sodium hydroxide flows. Resource recovery device for waste water treatment plants.

15. In paragraph 1, Further comprising a carbon dioxide storage tank for storing carbon dioxide supplied to the calcium mixing tank and the electrolysis unit. Resource recovery device for waste water treatment plants.

16. In paragraph 15, The above Euro module is, A 19th passage connected to the calcium mixing tank and the carbon dioxide storage tank and providing a passage through which the carbon dioxide flows; and Including a 22nd passage connected to the electrolysis unit and the carbon dioxide storage tank and providing a passage through which the carbon dioxide flows. Resource recovery device for waste water treatment plants.

Images