Hardness softening device and method for sewage retreatment

Abstract

The invention provides a hardness softening device and method for sewage retreatment, and relates to the technical field of sewage retreatment.The hardness softening device comprises a resin filter, an electric multi-way valve is installed on one side of the resin filter, the upper surface of the resin filter is communicated with a resin filter water inlet pipeline, and the lower surface of the resin filter is communicated with a resin filter water outlet pipeline; and the resin filter water inlet pipeline and the resin filter water outlet pipeline are both communicated with the electric multi-way valve. By arranging the resin filter and utilizing resin in the resin filter, the resin can selectively adsorb and exchange positive ions such as calcium ions and magnesium ions in hard substances and release a certain amount of sodium ions, so that the hardness of recycled water is reduced, and the problem of high hardness in the sewage retreatment process is solved; the water production rate of reclaimed water reuse is increased; and the water quality of the reuse water is improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of sewage reprocessing, and in particular relates to a hardness softening device and method for sewage reprocessing. Background Art

[0002] Wastewater treatment is an important part of environmental protection and health in production operations. A large amount of costs will be generated in the process of sewage treatment and purification, including electricity, chemical costs, compressed air loss, and secondary transportation costs, of which secondary transportation costs account for about 70%-90% of the total costs.

[0003] The sewage treated in the existing technology can meet the indicators of secondary transfer treatment, but does not meet the indicators for reuse as recycled water. It is mainly limited by conductivity, total alkalinity + total hardness, and SS (suspended solids). If this part of the sewage is directly discarded, it will directly cause waste of water resources and high transportation costs. In order to solve the above problem of total hardness, which is mainly caused by the excessive concentration of Ca2+, Mg2+ and other cations in the recycled water, the recycled water does not meet the circulating water reuse standards. To address this problem, a device and method for softening the hardness of sewage retreatment are proposed. Summary of the Invention

[0004] In order to solve the above problems, the present invention proposes a hardness softening device and method for sewage reprocessing to more accurately solve the above problems.

[0005] The present invention is achieved through the following technical solutions:

[0006] The present invention proposes a hardness softening device for sewage retreatment, comprising a resin filter, an electric multi-way valve installed on one side of the resin filter, the upper surface of the resin filter being connected to a resin filter water inlet pipe, and the lower surface being connected to a resin filter water outlet pipe, the resin filter water inlet pipe and the resin filter water outlet pipe being both connected to the electric multi-way valve, and the electric multi-way valve being connected to a resin water inlet pipe and a resin water outlet pipe.

[0007] Preferably, a regeneration salt barrel is provided on one side of the resin filter, the regeneration salt barrel is connected to the resin water inlet pipe, the regeneration salt barrel is connected to two delivery pipes, and the two delivery pipes are respectively installed with a water addition control valve and a regeneration salt barrel gas stirring valve.

[0008] Preferably, one side of the regenerated salt barrel is connected to a connecting pipe, the other end of the connecting pipe is connected to a regenerated salt pump, the regenerated salt pump is connected to a salt regeneration water inlet pipe, the salt regeneration water inlet pipe is connected to an electric multi-way valve, and the electric multi-way valve is connected to a resin regeneration drainage pipe.

[0009] Preferably, a regeneration salt barrel outlet valve is installed between the connecting pipe and the regeneration salt barrel, and a regeneration salt pump outlet valve is installed between the connecting pipe and the regeneration salt pump.

[0010] Preferably, a regeneration salt float flowmeter and a regeneration salt flow control valve are installed between the salt regeneration water inlet pipe and the regeneration salt pump.

[0011] A hardness softening method for a hardness softening device for sewage reprocessing, comprising the following steps:

[0012] Step 1: The recycled water enters the electric multi-way valve through the resin water inlet pipe, and the electric multi-way valve controls the recycled water to flow to the resin filter water inlet pipe and enter the resin filter for treatment;

[0013] Step 2: After the recycled water is filtered in the resin filter, it is discharged through the resin outlet pipe;

[0014] Step 3: Open the water adding control valve and the gas stirring valve of the regeneration salt tank, and prepare a sodium chloride solution with a concentration of m% into the regeneration salt tank by adding water and aeration;

[0015] Step 4: Open the regeneration salt pump inlet valve and the regeneration salt barrel outlet valve, turn on the regeneration salt pump, and the sodium chloride solution passes through the salt regeneration inlet pipe, the electric multi-way valve and the resin filter inlet pipe into the resin filter, and exchanges with the calcium ions, magnesium ions and other cations adsorbed in the resin structure, so that the adsorption and exchange sites on the resin are refilled with sodium ions, and the hardness substances are washed out;

[0016] Step 5: The displaced hard water is discharged from the resin filter through the resin regeneration drainage pipe.

[0017] The hardness softening device and method for sewage reprocessing proposed by the present invention can bring the following beneficial effects:

[0018] 1. By setting up a resin filter 1, the resin in the resin filter 1 can selectively adsorb and exchange cations in the water. The sodium resin structure contains many exchange sites, which can react with cations such as calcium ions and magnesium ions in hard water. The resin has a high affinity for sodium ions. When the resin comes into contact with water, the sodium ions on the resin will be replaced by hardness substances such as calcium ions and magnesium ions in the water. When water passes through the resin layer, the resin will selectively adsorb and exchange cations such as calcium ions and magnesium ions in the hardness substances, releasing a certain amount of sodium ions, thereby reducing the hardness of the recycled water;

[0019] 2. By setting up a regeneration salt tank, the filtration effect of the saturated resin filter is significantly reduced. By adding water and aerating and stirring, a 15% concentration of 1m 2The sodium chloride solution is sent to the regeneration salt barrel, and the regeneration salt is transported into the resin filter to refill the adsorption and exchange sites on the resin with sodium ions, and the hardness substances are washed out. The regenerated resin can continue to adsorb and exchange hardness substances in the water, realizing a continuous water softening process and ensuring the filtration capacity of the resin filter. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The drawings described herein are used to provide further understanding of the present invention and constitute a part of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0021] In the attached figure:

[0022] Figure 1 Schematic diagram of the present invention.

[0023] Figure 2 It is a structural schematic diagram of the regeneration salt pump, regeneration salt flow control valve and regeneration salt float flowmeter of the present invention.

[0024] Figure 3 It is a schematic diagram of the use of the present invention.

[0025] In the figure: 1. Resin filter; 2. Electric multi-way valve; 3. Resin filter water inlet pipe; 4. Resin filter water outlet pipe; 5. Resin water inlet pipe; 6. Resin water outlet pipe; 7. Regeneration salt barrel; 8. Delivery pipe; 9. Water addition control valve; 10. Regeneration salt barrel air stirring valve; 11. Connecting pipe; 12. Regeneration salt pump; 13. Salt regeneration water inlet pipe; 14. Regeneration salt barrel outlet valve; 15. Regeneration salt pump outlet valve; 16. Regeneration salt float flowmeter; 17. Regeneration salt flow control valve; 18. Resin regeneration drainage pipe. DETAILED DESCRIPTION

[0026] In order to more clearly illustrate the overall concept of the present invention, a detailed description is given below in an exemplary manner in conjunction with the accompanying drawings.

[0027] like Figures 1 to 3As shown, an embodiment of the present invention proposes a hardness softening device for sewage reprocessing, including a resin filter 1, an electric multi-way valve 2 is installed on one side of the resin filter 1, the upper surface of the resin filter 1 is connected to the resin filter water inlet pipe 3, and the lower surface is connected to the resin filter water outlet pipe 4, the resin filter water inlet pipe 3 and the resin filter water outlet pipe 4 are both connected to the electric multi-way valve 2, and the electric multi-way valve 2 is connected to the resin water inlet pipe 5 and the resin water outlet pipe 6. A 380VAC / 220VAC, 50HZ power supply is used in the equipment to treat treated production wastewater. The inner shell of the resin filter 1 is usually made of PE (polyethylene) plastic, which has good corrosion resistance and hygiene. The outer layer is made of reinforced glass fiber and high-performance epoxy resin three-dimensionally wound. The recycled water enters the electric multi-way valve 2 through the resin water inlet pipe 5 and is controlled by the electric multi-way valve. Valve 2 controls the filtration state, and the recycled water flows to the resin filter inlet pipe 3 and enters the resin filter 1. The calcium ions, magnesium ions and other cations in the recycled water undergo ion exchange reaction, and the softened water after filtration enters the next process through the resin outlet pipe 6. The resin in the resin filter 1 can selectively adsorb and exchange cations in the water by utilizing the special structure and characteristics of the resin. The sodium resin structure contains many exchange sites, which can react with cations such as calcium ions and magnesium ions in hard water. The resin has a high affinity for sodium ions. When the resin comes into contact with water, the sodium ions on the resin will be replaced by hardness substances such as calcium ions and magnesium ions in the water. When water passes through the resin layer, the resin will selectively adsorb and exchange cations such as calcium ions and magnesium ions in the hardness substances, releasing a certain amount of sodium ions, thereby reducing the hardness in the recycled water.

[0028] like Figure 1 and Figure 3 As shown, a regeneration salt barrel 7 is provided on one side of the resin filter 1. The regeneration salt barrel 7 is connected to the resin water inlet pipe 5. The regeneration salt barrel 7 is connected to two delivery pipes 8. The two delivery pipes 8 are respectively installed with a water addition control valve 9 and a regeneration salt barrel gas stirring valve 10. The regeneration salt barrel 7 is used for short-term and long-term storage of salt solution with a volume of 1m 2 The polyethylene container is connected to the regeneration salt barrel gas stirring valve 10 and the delivery pipe 8 for melting the medicine, and the delivery pipe 8 and the water adding control valve 9 for adding water for dispensing the medicine are connected. The filtration effect of the saturated resin filter 1 is significantly reduced. By adding water and explosive stirring, a 15% concentration of 1m 2 The sodium chloride solution is sent to the regeneration salt tank 7, and the regeneration salt is transported into the resin filter 1, so that the adsorption and exchange sites on the resin are refilled with sodium ions, and the hardness substances are washed out. The regenerated resin can continue to adsorb and exchange hardness substances in the water, realizing a continuous softening process and ensuring the filtration capacity of the resin filter 1. Compared with using a stronger acid as a regeneration agent, sodium ions (Na + ) has a weaker exchange capacity than hydrogen ions (H+ ) on the resin, but using strong acid as a regeneration agent will destroy the acid-base balance of the recycled water, thereby affecting the quality of the recycled water.

[0029] like Figure 1 and Figure 2 As shown, one side of the regeneration salt barrel 7 is connected to the connecting pipe 11, the other end of the connecting pipe 11 is connected to the regeneration salt pump 12, the regeneration salt pump 12 is connected to the salt regeneration water inlet pipe 13, the salt regeneration water inlet pipe 13 is connected to the electric multi-way valve 2, the electric multi-way valve 2 is connected to the resin regeneration drainage pipe 18, a regeneration salt barrel outlet valve 14 is installed between the connecting pipe 11 and the regeneration salt barrel 7, a regeneration salt pump outlet valve 15 is installed between the connecting pipe 11 and the regeneration salt pump 12, a regeneration salt float flowmeter 16 and a regeneration salt flow control valve 17 are installed between the salt regeneration water inlet pipe 13 and the regeneration salt pump 12, and a 15% concentration of 1m 2 After the sodium chloride solution is obtained, open the regeneration salt tank outlet valve 14 and the regeneration salt pump outlet valve 15 to allow the solution to reach the regeneration salt pump 12. The regeneration salt flow rate is adjusted to 2m3 by passing through the regeneration salt float flowmeter 16 and the regeneration salt flow control valve 17. 2 / h, enters the electric multi-way valve 2 through the salt regeneration water inlet pipe 13, and enters the resin filter 1 under the control of the electric multi-way valve 2 to regenerate the resin.

[0030] The electric multi-way valve 2 consists of a valve body, a valve core, a drive device, a sealing element, a connector, etc., which are respectively connected to the resin water inlet pipe 5 (PVC-U, DN50), the resin filter water inlet pipe 3 (PVC-U, DN50), the resin filter water outlet pipe 4 (PVC-U, DN50), the salt regeneration water inlet pipe 13 (PVC-U, DN25), and the resin regeneration drainage pipe 18 (PVC-U, DN50). The connection status of each pipe is controlled by the electric multi-way valve 2 to realize filtration, forward washing, backwashing, and regeneration, thereby achieving precise control and stable operation of the valve.

[0031] A hardness softening method for a hardness softening device for sewage reprocessing, comprising the following steps:

[0032] Step 1: The recycled water enters the electric multi-way valve 2 through the resin water inlet pipe. The electric multi-way valve 2 controls the recycled water to flow to the resin filter water inlet pipe 3 and enter the resin filter 1 for treatment;

[0033] Step 2: After the recycled water is filtered in the resin filter 1, it is discharged through the resin outlet pipe 6;

[0034] Step 3: Open the water adding control valve 9 and the regeneration salt tank gas stirring valve 10, and prepare 15% concentration 1m 2 The sodium chloride solution is sent to the regeneration salt tank 7;

[0035] Step 4: Open the regeneration salt pump 12 inlet valve and the regeneration salt tank outlet valve 14. Turn on the regeneration salt pump 12, and the sodium chloride solution passes through the salt regeneration water inlet pipe 13, the electric multi-way valve 2 and the resin filter water inlet pipe 3 into the resin filter 1, and exchanges with the calcium ions, magnesium ions and other cations adsorbed in the resin structure, so that the adsorption and exchange sites on the resin are refilled with sodium ions, and the hardness substances are washed out;

[0036] Step 5: The displaced hard water is discharged from the resin filter 1 through the resin regeneration drainage pipe 18 .

[0037] The various embodiments in this specification are described in a progressive manner. Similar parts between the various embodiments can be referred to in conjunction with each other. Each embodiment focuses on the differences between the other embodiments. In particular, the system embodiments are generally similar to the method embodiments, so the description is relatively simple. For relevant parts, refer to the description of the method embodiments.

[0038] The foregoing is merely an embodiment of the present invention and is not intended to limit the present invention. It will be apparent to those skilled in the art that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention are intended to be included within the scope of the claims of the present invention.

Claims

1. A hardness softening device for sewage reprocessing, characterized in that: The invention comprises a resin filter (1), wherein an electric multi-way valve (2) is installed on one side of the resin filter (1); the upper surface of the resin filter (1) is connected to a resin filter water inlet pipe (3), and the lower surface is connected to a resin filter water outlet pipe (4); the resin filter water inlet pipe (3) and the resin filter water outlet pipe (4) are both connected to the electric multi-way valve (2); and the upper portion of the electric multi-way valve (2) is connected to a resin water inlet pipe (5) and a resin water outlet pipe (6).

2. A hardness softening device for sewage reprocessing according to claim 1, characterized in that: A regeneration salt barrel (7) is provided on one side of the resin filter (1), the regeneration salt barrel (7) is connected to the resin water inlet pipe (5), the regeneration salt barrel (7) is connected to two delivery pipes (8), and the two delivery pipes (8) are respectively installed with a water addition control valve (9) and a regeneration salt barrel gas stirring valve (10).

3. A hardness softening device for sewage reprocessing according to claim 2, characterized in that: One side of the regeneration salt barrel (7) is connected to a connecting pipe (11), the other end of the connecting pipe (11) is connected to a regeneration salt pump (12), the regeneration salt pump (12) is connected to a salt regeneration water inlet pipe (13), the salt regeneration water inlet pipe (13) is connected to an electric multi-way valve (2), and the electric multi-way valve (2) is connected to a resin regeneration drainage pipe (18).

4. A hardness softening device for sewage reprocessing according to claim 3, characterized in that: A regeneration salt barrel outlet valve (14) is installed between the connecting pipe (11) and the regeneration salt barrel (7), and a regeneration salt pump outlet valve (15) is installed between the connecting pipe (11) and the regeneration salt pump (12).

5. The hardness softening device for sewage reprocessing according to claim 4, characterized in that: A regeneration salt float flowmeter (16) and a regeneration salt flow control valve (17) are installed between the salt regeneration water inlet pipe (13) and the regeneration salt pump (12).

6. A hardness softening method for a hardness softening device for sewage reprocessing according to claim 5, characterized in that: The following steps are involved: Step 1: The recycled water enters the electric multi-way valve (2) through the resin water inlet pipe, and the electric multi-way valve (2) controls the recycled water to flow to the resin filter water inlet pipe (3) and enter the resin filter (1) for treatment; Step 2: After the recycled water is filtered in the resin filter (1), it is discharged through the resin outlet pipe (6); Step 3: Open the water adding control valve (9) and the regeneration salt tank gas stirring valve (10), and prepare 15% concentration 1m 2 The sodium chloride solution is sent to the regeneration salt tank (7); Step 4: Open the regeneration salt pump (12) inlet valve and the regeneration salt barrel outlet valve (14), open the regeneration salt pump (12), and the sodium chloride solution passes through the salt regeneration water inlet pipe (13), the electric multi-way valve (2) and the resin filter water inlet pipe (3) into the resin filter (1), and exchanges with the calcium ions, magnesium ions and other cations adsorbed in the resin structure, so that the adsorption and exchange sites on the resin are refilled with sodium ions, and the hardness substances are washed out; Step 5: The displaced hard water is discharged from the resin filter (1) through the resin regeneration drainage pipe (18).

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