Treatment device suitable for reuse water with conductivity less than or equal to 1500 [mu] s / cm

Abstract

The utility model relates to a treatment device suitable for reuse water with the conductivity less than or equal to 1500 microseconds / cm, and mainly solves the problem that in the prior art, the sewage treatment cost is too high due to the fact that the amount of low-conductivity discharged water after biochemical treatment is large. The problem is well solved by adopting the technical scheme that the treatment device suitable for the low-conductivity recycled water comprises a recycled water collecting tank (1), a multi-medium filter (2), a resin water softener (3), a self-cleaning filter (4), an ultrafiltration system (5), an ultrafiltration produced water collecting tank (6), a reverse osmosis system (7) and a recycled produced water collecting tank (8) which are connected in sequence. The method can be used for industrial application of sewage treatment.

Description

Technical Field

[0001] This utility model relates to a treatment device suitable for recycled water with conductivity ≤1500μs / cm. Background Technology

[0002] Currently, most chemical plants discharge their wastewater after biochemical treatment directly to the industrial park's drainage station. The conductivity of this biochemical wastewater is 1300–1500 μs / cm, and 300–400 tons are discharged daily. The cost of each ton of wastewater discharged is 12–16 yuan, making wastewater treatment quite expensive.

[0003] Chinese patent CN110759535B discloses a method and system for treating recycled water. The method involves softening, filtering, and cation exchange of the recycled water, followed by reverse osmosis treatment. This reverse osmosis treatment includes a primary reverse osmosis stage and a secondary reverse osmosis stage, with degassing occurring between these two stages, followed by anion and cation exchange treatment. The pH of the influent for the degassing treatment is adjusted to 4.3–5.2, and the degassing is performed at an air-to-liquid ratio of 0.1–0.3 m³ / kg. This invention significantly improves the efficiency of recycled water treatment, and the resulting recycled water can be directly used as demineralized water for high-pressure boilers. However, the biochemically treated coal chemical industrial wastewater has a conductivity of 7000–8000 μS / cm, which is high, making the membrane components prone to damage, resulting in high equipment and treatment costs.

[0004] Therefore, there is an urgent need for a treatment device suitable for recycled water with a conductivity ≤1500μs / cm. Utility Model Content

[0005] The technical problem to be solved by this invention is that the large volume of low conductivity wastewater discharged after biochemical treatment in the prior art leads to excessively high wastewater treatment costs. This invention provides a treatment device suitable for recycled water with conductivity ≤1500μs / cm, which has the advantages of reducing wastewater treatment costs and saving water.

[0006] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows: A treatment device suitable for recycled water with conductivity ≤1500μs / cm, comprising a greywater collection tank 1, a multi-media filter 2, a resin water softener 3, a self-cleaning filter 4, an ultrafiltration system 5, an ultrafiltration permeate collection tank 6, a reverse osmosis system 7, and a recycled permeate collection tank 8 connected in series; wherein, the greywater collection tank 1 collects the biochemically treated wastewater, the conductivity of which is 1300~1500μs / cm; the multi-media filter 2 uses quartz sand as filter media, layered and proportioned, mainly removing suspended solids, particulate matter, and fibrous matter, reducing the turbidity of the influent to the membrane system, purifying the water quality, and reducing mechanical damage to the membranes in subsequent systems; the multi-media filter 2 is fully automatic, and its operating parameters can be set; the resin water softener 3 uses cation exchange resin as the exchange carrier, mainly removing calcium and magnesium scale substances in the influent, reducing the turbidity of the influent to the membrane system. The hardness of the water is reduced, thus reducing scaling on the subsequent system membranes. The resin water softener 3 operates fully automatically, and its operating parameters can be set. The self-cleaning filter 4 is a precision device that directly intercepts impurities in the water using a filter screen, removing suspended solids and particulate matter, reducing turbidity, and purifying the water. It can reduce mechanical damage, algae, and corrosion in the system, while also purifying the water and protecting the normal operation of other equipment in the system. The ultrafiltration system 5 includes an ultrafiltration frame, membrane elements, a backwash pump, and its auxiliary dosing system, and operates in a fully automatic, unattended mode. The reverse osmosis system 7 is also equipped with a high-pressure pump. The high-pressure pump inlet is equipped with a low-pressure switch, which alarms and stops the pump when the pressure is low, and the outlet is equipped with a high-pressure switch, which alarms and stops the pump when the pressure is high. The reverse osmosis system 7 includes a security filter 7-1 and a reverse osmosis membrane element 7-2. The security filter 7-1 has a corrosion-resistant stainless steel SS304 shell, an exhaust valve on the top, and a filtration velocity of ≤10m / s² on the filter element surface. 3 / m 2 •h, filter element filtration accuracy ≤5μm; the reverse osmosis membrane element 7-2 consists of 20 to 30 elements, with a membrane pore size of

[0007] Furthermore, the type and point of chemical dosing in the ultrafiltration system 5, as well as the selection of chemical cleaning solution, are determined based on the influent water quality and the characteristics of the selected ultrafiltration membrane module, and a sampling interface is provided on the outlet pipe.

[0008] Furthermore, pressure gauges are installed at the outlets of the greywater collection tank 1, the ultrafiltration permeate collection tank 6, the security filter 7-1, and the reuse permeate collection tank 8.

[0009] Furthermore, flow meters are installed at the inlet of the greywater collection tank 1 and the outlet of the recycled product water collection tank 8 to control the pipeline flow.

[0010] Furthermore, the conductivity of the biochemical wastewater is 1300–1500 μS / cm.

[0011] This invention provides a treatment device suitable for recycled water with a conductivity ≤1500μs / cm. The reverse osmosis system 7 utilizes the principle that under pressure higher than the osmotic pressure of the solution, some substances cannot pass through the semi-permeable membrane, thus separating these substances from the water. Because the membrane pore size of the reverse osmosis membrane element 7-2 is very small, it can effectively remove dissolved salts, colloids, microorganisms, organic matter, etc. from the water (with a removal rate of up to 98% or more), achieving good technical results. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the device of this utility model.

[0013] Figure 1 In the diagram, 1 is the greywater collection tank, 2 is the multi-media filter, 3 is the resin water softener, 4 is the self-cleaning filter, 5 is the ultrafiltration system, 6 is the ultrafiltration permeate collection tank, 7 is the reverse osmosis system, and 8 is the reuse permeate collection tank. Detailed Implementation

[0014] To make the objectives, technical solutions, and advantages of this utility model clearer, the following detailed description is provided in conjunction with embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this utility model.

[0015] This invention provides a treatment device suitable for recycled water with a conductivity ≤1500μs / cm, comprising a greywater collection tank 1, a multi-media filter 2, a resin water softener 3, a self-cleaning filter 4, an ultrafiltration system 5, an ultrafiltration permeate collection tank 6, a reverse osmosis system 7, and a recycled permeate collection tank 8 connected in series. The greywater collection tank 1 collects the biochemically treated wastewater, which has a conductivity of 1431μs / cm. The multi-media filter 2 uses quartz sand as filter media, layered and proportioned, primarily removing suspended solids, particulate matter, and fibers, reducing the turbidity of the influent to the membrane system, purifying the water quality, and reducing mechanical damage to the membranes in subsequent systems. The multi-media filter 2 operates fully automatically, and its operating parameters are adjustable. The resin water softener 3 uses cation exchange resin as the exchange carrier, primarily removing calcium and magnesium scale from the influent, reducing the hardness of the influent to the membrane system, and reducing mechanical damage to the membranes in subsequent systems. The resin water softener 3 is fully automatic, and its operating parameters can be set. The self-cleaning filter 4 is a precision device that directly intercepts impurities in the water, removes suspended solids and particulate matter, reduces turbidity, and purifies the water. It can reduce mechanical damage, algae, and corrosion in the system, while purifying the water and protecting the normal operation of other equipment in the system. The ultrafiltration system 5 includes an ultrafiltration frame, membrane elements, a backwash pump, and an auxiliary dosing system, and adopts a fully automatic unattended operation mode. The reverse osmosis system 7 is also equipped with a high-pressure pump. The high-pressure pump inlet is equipped with a low-pressure switch, which alarms and stops the pump when the pressure is low, and the outlet is equipped with a high-pressure switch, which alarms and stops the pump when the pressure is high. The reverse osmosis system 7 includes a security filter 7-1 and a reverse osmosis membrane element 7-2. The security filter 7-1 is made of corrosion-resistant stainless steel SS304 material with an exhaust valve on the top. The filtration speed on the surface of the filter element is ≤10m / s. 3 / m 2 •h, filter element filtration accuracy ≤5μm; the reverse osmosis membrane element 7-2 consists of 15 elements, with a membrane pore size of

[0016] Furthermore, the type and point of chemical dosing in the ultrafiltration system 5, as well as the selection of chemical cleaning solution, are determined based on the influent water quality and the characteristics of the selected ultrafiltration membrane module, and a sampling interface is provided on the outlet pipe.

[0017] Furthermore, pressure gauges are installed at the outlets of the greywater collection tank 1, the ultrafiltration permeate collection tank 6, the security filter 7-1, and the reuse permeate collection tank 8.

[0018] Furthermore, flow meters are installed at the inlet of the greywater collection tank 1 and the outlet of the recycled product water collection tank 8 to control the pipeline flow.

[0019] The biochemical wastewater has a conductivity of 1431 μs / cm, a hardness of 173 mg / L, and a calcium hardness of 70 mg / L. After passing through the reverse osmosis membrane element 7-2, about 40% of the concentrated water will be discharged, and the remaining 60% of the treated water will be sent to the reuse product water collection tank 8. After testing, the conductivity of the treated water is ≤50 μs / cm, the hardness is ≤2 mg / L, and the calcium hardness is ≤1 mg / L. All indicators are greatly reduced, reducing the cost of wastewater treatment. At the same time, the treated water will be used as fresh water to supplement the circulating water device, saving a lot of replenishment water and achieving good technical results.

Claims

1. A treatment device suitable for recycled water with conductivity ≤1500μs / cm, comprising a greywater collection tank (1), a multi-media filter (2), a resin water softener (3), a self-cleaning filter (4), an ultrafiltration system (5), an ultrafiltration permeate collection tank (6), a reverse osmosis system (7), and a recycled permeate collection tank (8) connected in series; the greywater collection tank (1) collects biochemical wastewater; the multi-media filter (2) uses quartz sand as filter media, layered and proportioned, mainly removing suspended solids, particulate matter, and fibrous matter, reducing the turbidity of the influent to the membrane system, purifying the water quality, and reducing mechanical damage to the membranes in subsequent systems; the multi-media filter (2) operates fully automatically, and its operating parameters can be set; the resin water softener (3) uses cation exchange resin as the exchange carrier, mainly removing suspended solids, particulate matter, and fibrous matter, reducing the turbidity of the influent to the membrane system, purifying the water quality, and reducing mechanical damage to the membranes in subsequent systems; the multi-media filter (2) operates fully automatically, and its operating parameters can be set; the resin water softener (3) uses cation exchange resin as the exchange carrier, mainly removing suspended solids, particulate matter, and fibrous matter, reducing the turbidity of the influent to the membrane system, purifying the water quality, and reducing mechanical damage to the membranes in subsequent systems. In addition to removing calcium and magnesium scale substances from the influent, the hardness of the influent to the membrane system is reduced, and scale formation on the membranes of subsequent systems is reduced. The resin water softener (3) is fully automatic, and the operating parameters can be set. The self-cleaning filter (4) is a precision device that uses a filter screen to directly intercept impurities in the water, removes suspended solids and particulate matter, reduces turbidity, and purifies the water quality. It can reduce mechanical damage, algae and rust in the system, and at the same time purify the water quality and protect the normal operation of other equipment in the system. The ultrafiltration system (5) includes an ultrafiltration frame, membrane elements, backwash pump and its auxiliary dosing system, and adopts a fully automatic unattended operation mode. The reverse osmosis system (7) is also equipped with a high-pressure pump. The high-pressure pump inlet is equipped with a low-pressure switch, which alarms and stops the pump when the pressure is low, and the outlet is equipped with a high-pressure switch, which alarms and stops the pump when the pressure is high. Its features are: The reverse osmosis system (7) includes a security filter (7-1) and a reverse osmosis membrane element (7-2); the security filter (7-1) is made of corrosion-resistant stainless steel SS304 with an exhaust valve on the top, and the filtration velocity on the filter element surface is ≤10m. 3 / m 2 •h, the filter element filtration accuracy is ≤5μm; the reverse osmosis membrane element (7-2) consists of 20~30 elements with a membrane pore size of 10Å.

2. The treatment device for recycled water with a conductivity ≤1500 μs / cm according to claim 1, characterized in that, The type and point of chemical dosing of the ultrafiltration system (5) and the selection of chemical cleaning solution are determined according to the quality of the influent water and the characteristics of the selected ultrafiltration membrane module. A sampling interface is set on the outlet pipe.

3. The treatment device for recycled water with a conductivity ≤1500 μs / cm according to claim 1, characterized in that, Pressure gauges are installed at the outlets of the aforementioned greywater collection tank (1), ultrafiltration permeate collection tank (6), security filter (7-1), and reuse permeate collection tank (8).

4. The treatment device for recycled water with a conductivity ≤1500 μs / cm according to claim 1, characterized in that, Flow meters are installed at the inlet of the greywater collection tank (1) and the outlet of the recycled water collection tank (8) to control the flow rate in the pipeline.

5. The treatment device for recycled water with a conductivity ≤1500 μs / cm according to claim 1, characterized in that, The conductivity of the biochemical wastewater is 1300~1500 μs / cm.

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