Evaporation-free salt-limited up-to-standard discharge system device

Abstract

The utility model belongs to the technical field of wastewater salt-limited discharge, and particularly relates to an evaporation-free salt-limited up-to-standard discharge system device which comprises raw water, a pretreatment device, a membrane concentration device, a calcium sulfate crystallization device, a sludge filter pressing device and a first connecting pipe, the raw water, the pretreatment device, the membrane concentration device, the calcium sulfate crystallization device and the sludge filter pressing device are connected in series through a first connecting pipe, the surface of the first connecting pipe is connected with a first control valve, and a second connecting pipe is further connected between the membrane concentration device and the calcium sulfate crystallization device; the membrane concentration device and the calcium sulfate crystallization device are matched to greatly reduce total dissolved solids and sulfate radicals in water, produced water and membrane produced water can meet up-to-standard discharge requirements after being mixed, and are discharged into the discharge tank through the second connecting pipe, so that an expensive evaporation device is not needed for desalting, a large amount of investment and operation cost are saved, and the production cost is reduced. Therefore, the purpose of salt-limited discharge of the concentrated water under the conditions of low investment and low operation cost is achieved.

Description

Technical Field

[0001] The utility model belongs to the technical field of wastewater salt-limited discharge, and in particular relates to a non-evaporation salt-limited standard discharge system device. Background Art

[0002] The existing processes all use the double alkali method to reduce hardness (pretreatment) + membrane concentration + evaporation desalination process to treat high-salinity water. The evaporation desalination process used at the high-salinity water treatment terminal is a common wastewater treatment method, mainly used to treat wastewater containing high-concentration salt substances. This evaporation process evaporates the salt-containing wastewater under specific conditions, and finally concentrates and separates the salt substances, thereby achieving the purpose of wastewater treatment and resource recovery.

[0003] In the saline wastewater evaporation process, the wastewater must first be pretreated to remove suspended matter, sediment and hardness to ensure the smooth progress of the subsequent evaporation process. Next, the pretreated wastewater is sent to the membrane concentration device, and the high-salt water is further concentrated before entering the evaporation equipment. The commonly used evaporation equipment includes multiple-effect evaporators, membrane evaporators and flash evaporators.

[0004] The salty wastewater will be evaporated in the evaporation equipment under high temperature and low pressure, the water will gradually evaporate, and the salt substances will be concentrated. In the multi-effect evaporator, the multi-stage evaporator circulates the evaporation to improve the evaporation efficiency; in the membrane evaporator, the wastewater is screened by the membrane to separate the water and salt substances.

[0005] Finally, through the evaporation process, the concentrated salt substances obtained can be crystallized, solidified and other methods to obtain solid salt materials, and the remaining evaporated water can be further processed for recycling or discharge. In general, the evaporation process of saline wastewater is relatively simple and efficient, but the device has high investment and operating costs, and the burden on enterprises is heavy.

[0006] The existing technology relies on electricity and steam to drive the wastewater to gradually evaporate, concentrate the salt substances therein and obtain solid salt materials. However, the existing process produces a large amount of concentrated water and requires multi-stage reverse osmosis concentration to meet the salt output conditions of the evaporation crystallization device, resulting in a high cost for the process involving the evaporation crystallization device, which is unfavorable for the initial investment cost and the subsequent operation and maintenance cost. Utility Model Content

[0007] The utility model aims to provide a non-evaporation salt-limited emission system device, aiming to solve the problems in the prior art of requiring multi-stage reverse osmosis concentration, large evaporation volume, high equipment cost and reducing initial investment and operation and maintenance costs.

[0008] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a non-evaporation salt limit emission system device, comprising raw water, a pretreatment device, a membrane concentration device, a calcium sulfate crystallization device, a sludge filter press device and a first connecting pipe, wherein the raw water, the pretreatment device, the membrane concentration device, the calcium sulfate crystallization device and the sludge filter press device are connected in series through the first connecting pipe, a first control valve is connected to the surface of the first connecting pipe, a second connecting pipe is also connected between the membrane concentration device and the calcium sulfate crystallization device, and a second control valve is connected to the surface of the second connecting pipe.

[0009] As a preferred embodiment of a non-evaporation salt limit emission system device of the utility model, the first connecting pipe and the second connecting pipe are both made of metal, and the first connecting pipe and the second connecting pipe are connected to the pretreatment device, membrane concentration device, calcium sulfate crystallization device and sludge filter press device through flanges.

[0010] As a preferred embodiment of the utility model of a non-evaporation salt-limited emission system device, the model of the first control valve and the second control valve is TGRD7141.

[0011] As a preferred embodiment of the utility model of a non-evaporation limited salt emission system device, the side wall of the calcium sulfate crystallization device is connected with a first drain outlet and a second drain outlet, and the first drain outlet and the second drain outlet are symmetrically connected to the side wall of the calcium sulfate crystallization device in the upper and lower directions.

[0012] As a preferred device of the utility model for a non-evaporation salt limit emission system, the second drain outlet is connected to the membrane concentration device through a second connecting pipe, and the first drain outlet is connected to the membrane concentration device and the sludge filter press device through a first connecting pipe.

[0013] As a preferred embodiment of the utility model of a non-evaporation salt limit emission system device, the end of the second connecting pipe is connected to a discharge pool, and the discharge pool is connected in series with the membrane concentration device through the second connecting pipe and the calcium sulfate crystallization device.

[0014] Compared with the prior art, the beneficial effects of the utility model are:

[0015] The utility model utilizes the cooperation between a membrane concentration device and a calcium sulfate crystallization device to significantly reduce the total soluble solids and sulfate ions in the water. The produced water can meet the discharge requirements after being mixed with the membrane produced water, and is discharged into the discharge pool through the second connecting pipe. There is no need to use an expensive evaporation device for desalination, which saves a lot of investment and operating costs, thereby achieving the purpose of limiting the salt discharge of concentrated water with low investment and low operating costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0017] Figure 1 It is a schematic diagram of the main structure of the utility model;

[0018] Figure 2 It is a schematic diagram of the connection structure of the membrane concentration device, the calcium sulfate crystallization device and the second connecting pipe of the utility model;

[0019] Figure 3 This is a schematic diagram of the structure of a calcium sulfate crystallization device of the utility model;

[0020] Figure 4 It is a schematic diagram of the process structure of the utility model.

[0021] In the figure: 1. raw water; 2. pretreatment device; 3. membrane concentration device; 4. calcium sulfate crystallization device; 5. sludge filter press device; 6. first control valve; 7. first connecting pipe; 8. second connecting pipe; 9. second control valve; 41. first drain outlet; 42. second drain outlet; 43. discharge tank. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0023] Embodiment 1

[0024] See also Figure 1-4 The utility model provides the following technical solutions: a non-evaporation salt limit emission system device, comprising raw water 1, a pretreatment device 2, a membrane concentration device 3, a calcium sulfate crystallization device 4, a sludge filter press device 5 and a first connecting pipe 7. The raw water 1, the pretreatment device 2, the membrane concentration device 3, the calcium sulfate crystallization device 4 and the sludge filter press device 5 are connected in series through the first connecting pipe 7. A first control valve 6 is connected to the surface of the first connecting pipe 7. A second connecting pipe 8 is also connected between the membrane concentration device 3 and the calcium sulfate crystallization device 4. A second control valve 9 is connected to the surface of the second connecting pipe 8.

[0025] In the embodiment, the working principle of the salt-limited discharge of wastewater is described. First, the raw water 1 is sent to the first connecting pipe 7, and then the raw water 1 passes through the pretreatment device 2, the membrane concentration device 3, the calcium sulfate crystallization device 4 and the sludge filter press device 5. When the raw water 1 passes through the pretreatment device 2, the pretreatment device 2 removes the suspended matter, sediment and hardness contained in the raw water 1. Then, the raw water 1 passes through the first connecting pipe 7 and enters the membrane concentration device 3. The raw water 1 is concentrated by the membrane concentration device 3. After the raw water 1 is concentrated, , the calcium sulfate in the raw water 1 is supersaturated by 4-8 times to form calcium sulfate crystals, and then the raw water 1 enters the calcium sulfate crystallization device 4 through the first connecting pipe 7. At this time, the calcium sulfate crystallization device 4 settles the calcium sulfate crystals in the raw water 1, and then the raw water 1 in the calcium sulfate crystallization device 4 is divided into an upper and lower layer, the lower layer of raw water 1 enters the first connecting pipe 7 through the first drain port 41, and then enters the sludge filter press device 5 along the first connecting pipe 7 for filtration, and the upper layer of raw water 1 flows into the discharge pool 43 through the second drain port 42.

[0026] Embodiment 2

[0027] See also Figure 1-4 The first connecting pipe 7 and the second connecting pipe 8 are both made of metal, and the first connecting pipe 7 and the second connecting pipe 8 are connected to the pretreatment device 2, the membrane concentration device 3, the calcium sulfate crystallization device 4 and the sludge filter press device 5 through flanges.

[0028] Preferably, the model of the first control valve 6 and the second control valve 9 is TGRD7141.

[0029] Preferably, the side wall of the calcium sulfate crystallization device 4 is connected with a first drain port 41 and a second drain port 42 , and the first drain port 41 and the second drain port 42 are connected to the side wall of the calcium sulfate crystallization device 4 in a vertically symmetrical manner.

[0030] Preferably, the second drain port 42 is connected to the membrane concentration device 3 through the second connecting pipe 8 , and the first drain port 41 is connected to the membrane concentration device 3 and the sludge filter press device 5 through the first connecting pipe 7 .

[0031] Preferably, the end of the second connecting pipe 8 is connected to a discharge tank 43 , and the discharge tank 43 is connected in series with the membrane concentration device 3 through the second connecting pipe 8 and the calcium sulfate crystallization device 4 .

[0032] In the embodiment, according to the description of the above-mentioned embodiment 1, the calcium sulfate crystallization device 4 settles the calcium sulfate crystals in the raw water 1, and then the raw water 1 in the calcium sulfate crystallization device 4 is divided into an upper and lower layer, the lower layer is the raw water 1 containing higher calcium sulfate crystals, and the upper layer is the raw water 1 containing lower calcium sulfate crystals. Then, the upper layer of raw water 1 flows into the second connecting pipe 8 and is discharged into the discharge pool 43, while the lower layer of raw water 1 enters the sludge filter press device 5 again through the first connecting pipe 7 and is filtered. The upper layer of raw water 1 meets the discharge requirements, and there is no need to use an expensive evaporation device for desalination, which saves a lot of investment and operating costs, thereby achieving the purpose of limiting the discharge of concentrated water with low investment and low operating costs.

[0033] It should be noted that when the raw water 1 flows in the first connecting pipe 7 and the second connecting pipe 8 , the first control valve 6 and the second control valve 9 need to be opened to avoid the situation where the raw water 1 cannot flow.

[0034] It should be noted that the lower layer of raw water 1 is in the calcium sulfate crystallization device 4, which will also reduce the hardness of the calcium sulfate crystals. In the calcium carbonate crystallization process section, reagents are added to adjust the saturated precipitation of the single-component calcium carbonate in the water. At the same time, the total dissolved solids in the water are also reduced. The calcium sulfate crystals produced by the precipitation can be reused for boiler desulfurization, further reducing the amount of solid waste disposal. The classification process of the calcium sulfate crystallization device 4 is based on the controlled crystallization precipitation technology of calcium sulfate, coupled with the control of the single precipitation technology of calcium carbonate, combined with high-efficiency scale inhibitors, reaction regulators, etc., following the "resource utilization", "reduction" and "harmlessness" design concepts, which can greatly reduce the amount of sodium carbonate added, significantly reduce the amount of solid waste sludge generated, and eliminate the terminal evaporation device, so as to achieve the advanced process route of low-cost, stable and reliable operation of industrial high-salt water treatment systems.

[0035] Finally, it should be noted that the above description is only a preferred embodiment of the utility model and is not intended to limit the utility model. Although the utility model is described in detail with reference to the above embodiments, those skilled in the art can still modify the technical solutions recorded in the above embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A non-evaporation and salt-limited emission system device, characterized by: The invention comprises raw water (1), a pretreatment device (2), a membrane concentration device (3), a calcium sulfate crystallization device (4), a sludge filter press device (5) and a first connecting pipe (7), wherein the raw water (1), the pretreatment device (2), the membrane concentration device (3), the calcium sulfate crystallization device (4) and the sludge filter press device (5) are connected in series via the first connecting pipe (7); A first control valve (6) is connected to the surface of the first connecting pipe (7), a second connecting pipe (8) is also connected between the membrane concentration device (3) and the calcium sulfate crystallization device (4), and a second control valve (9) is connected to the surface of the second connecting pipe (8).

2. The non-evaporation and salt-limited emission system device according to claim 1 is characterized by: The first connecting pipe (7) and the second connecting pipe (8) are both made of metal, and the first connecting pipe (7) and the second connecting pipe (8) are connected to the pretreatment device (2), the membrane concentration device (3), the calcium sulfate crystallization device (4) and the sludge filter press device (5) via flanges.

3. The non-evaporation and salt-limited emission system device according to claim 1 is characterized in that: The model of the first control valve (6) and the second control valve (9) is TGRD7141.

4. The non-evaporation and salt-limited emission system device according to claim 1 is characterized in that: The side wall of the calcium sulfate crystallization device (4) is connected to a first drain outlet (41) and a second drain outlet (42); the first drain outlet (41) and the second drain outlet (42) are connected to the side wall of the calcium sulfate crystallization device (4) in a vertically symmetrical manner.

5. The non-evaporation and salt-limited emission system device according to claim 4 is characterized in that: The second drainage port (42) is connected to the membrane concentration device (3) via a second connecting pipe (8), and the first drainage port (41) is connected to the membrane concentration device (3) and the sludge filter press device (5) via a first connecting pipe (7).

6. The non-evaporation and salt-limited emission system device according to claim 1 is characterized by: The end of the second connecting pipe (8) is connected to a discharge tank (43), and the discharge tank (43) is connected in series with the membrane concentration device (3) via the second connecting pipe (8) and the calcium sulfate crystallization device (4).

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