CN106904698A - Calcium chloride high-salinity wastewater zero-emission processing unit - Google Patents

Abstract

The present invention relates to a kind of calcium chloride high-salinity wastewater zero-emission processing unit, it is related to high-salt wastewater processing technology field, solves the technical problem that the precipitate such as chlorine and calcium carbonate present in prior art not separate.Calcium chloride high-salinity wastewater zero-emission processing unit of the invention includes waste water tank, recycling unit and fresh-water tank, high-salt wastewater is processed by recycling unit, make the calcium in high slat-containing wastewater and chlorion removal and obtain fresh water, high-salt wastewater is separated out after can forming chlorine and calcium carbonate by electrochemical reaction in recycling unit in the process, and chlorine is discharged respectively with calcium carbonate, i.e. chlorine is discharged by chlorine collection port, calcium carbonate is then reclaimed by calcium carbonate collection case, whole processing procedure can not only reach no pollution zero-emission but also for follow-up collection utilizes the condition provided convenience with secondary.

Description

Calcium chloride high-salt wastewater zero discharge treatment device

technical field

The invention relates to the technical field of high-salt wastewater treatment, in particular to a zero-discharge treatment device for calcium chloride high-salt wastewater.

Background technique

Calcium chloride high-salt wastewater refers to wastewater containing high concentrations of soluble calcium chloride inorganic salts (generally wastewater with a salinity greater than 3%). Due to the shortage of water resources, the wastewater discharged from petroleum, chemical, pharmaceutical and other heavy polluting industries often contains high concentrations of soluble inorganic salts and refractory or toxic organic pollutants, which has caused tremendous pressure on the living environment. At present, the treatment technology of high-salt wastewater generally has the characteristics of high cost or secondary pollution, so people are exploring the use of resource-based treatment to treat high-salt wastewater, but in the process of resource-based treatment, chlorine and carbonic acid Calcium and other precipitates were not separated, making it difficult to carry out follow-up work.

Contents of the invention

The invention provides a zero-discharge treatment device for calcium chloride high-salt wastewater, which is used to solve the technical problem in the prior art that precipitates such as chlorine gas and calcium carbonate are not separated.

The present invention provides a zero-discharge treatment device for calcium chloride high-salt wastewater, which includes a waste water tank, a recycling device and a fresh water tank. The recycling device is respectively connected to the waste water tank and the fresh water tank through pipelines. The upper end of the recycling device is provided with a chlorine gas collection port and a calcium carbonate collection box.

In one embodiment, the recycling device includes a box body, an electrodialysis membrane stack and a power supply, the electrodialysis membrane stack is arranged inside the box body, and the electrodialysis membrane stack is used to separate out calcium carbonate; The power supply is arranged outside the box, and the power supply is electrically connected to the box;

The calcium carbonate collection box is located at the bottom of the box and communicated with the box.

In one embodiment, the number of the electrodialysis membrane stacks is at least three, and the electrodialysis membrane stacks are arranged in parallel;

The chlorine gas collection port is arranged on the upper end of the box, and each electrodialysis membrane stack is provided with one chlorine gas collection port.

In one embodiment, both ends of the electrodialysis membrane stack are provided with insulating fixing blocks, and the electrodialysis membrane stack is fixed inside the box through the insulating fixing blocks.

In one embodiment, the calcium carbonate collection box is arranged at the lower end of the box body, the calcium carbonate collection box is funnel-shaped, and the bottom end of the calcium carbonate collection box is connected with a drain valve.

In one embodiment, at least three input ends are provided on the tank body, and the input ends are all connected to the pipeline of the waste water tank, and water inlet regulating valves are arranged at the input ends.

In one embodiment, at least three output ends are provided on the tank body, and the output ends are all connected to the pipeline of the fresh water tank, and water outlet regulating valves are arranged at the output ends.

In one embodiment, the input ends are located on one side wall of the box; the output ends are located on the other side wall of the box.

In one embodiment, a ball valve, a water pump and a check valve are sequentially connected in series on the pipeline between the waste water tank and the input end, and the check valve is used to keep the liquid in one-way flow.

In one embodiment, a pressure gauge and a flowmeter are also arranged on the pipeline between the waste water tank and the input end, the pressure gauge is used for monitoring the liquid pressure in the pipeline, and the flowmeter is used for To measure the flow rate of the liquid in the pipeline, both the pressure gauge and the flow meter are connected in series after the check valve.

Compared with the prior art, the advantage of the present invention is that the high-salt wastewater is treated by the resource recovery device, and the calcium and chloride ions in the high-salt wastewater are removed to obtain fresh water. Chlorine gas and calcium carbonate are formed through the electrochemical reaction in the chemical device and then precipitated, and the chlorine gas and calcium carbonate are discharged separately, that is, the chlorine gas is discharged from the chlorine gas collection port, and the calcium carbonate is recovered from the calcium carbonate collection box. The whole treatment process can not only It achieves zero pollution and zero discharge and provides convenient conditions for subsequent collection and secondary use.

Description of drawings

Hereinafter, the present invention will be described in more detail based on the embodiments with reference to the accompanying drawings.

Fig. 1 is the structural representation of the calcium chloride high-salt wastewater zero-discharge treatment device in the embodiment of the present invention;

Fig. 2 is a schematic structural diagram of the electrodialysis membrane stack shown in Fig. 1 .

In the figures, the same parts are given the same reference numerals. The drawings are not drawn to scale.

Reference signs:

1-wastewater tank; 2-recycling device; 3-fresh water tank;

4-ball valve; 5-water pump; 6-check valve;

7-pressure gauge; 8-flow meter; 9-drain valve;

21-Chlorine gas collection port; 22-Calcium carbonate collection box; 23-Case body;

24-Electrodialysis membrane stack; 25-Power supply; 26-Insulation fixed block;

231-input end; 232-water inlet regulating valve; 233-output end;

234-water outlet regulating valve; 235-drain outlet; 241-yin film;

242-positive membrane; 243-diaphragm; 244-anode chamber;

245 - Cathode chamber.

detailed description

The present invention will be further described below in conjunction with accompanying drawing.

Fig. 1 is a schematic structural view of a calcium chloride high-salt wastewater zero-discharge treatment device in an embodiment of the present invention; as shown in Figure 1, the present invention provides a calcium chloride high-salt wastewater zero-discharge treatment device, including a waste water tank 1. Recycling device 2 and fresh water tank 3. Recycling device 2 is connected to waste water tank 1 and fresh water tank 3 through pipelines respectively. The upper end of resource recycling device 2 is provided with chlorine gas collection port 21 and calcium carbonate collection box 22. In the recycling device 2, chlorine gas and calcium carbonate are formed through an electrochemical reaction and then precipitated, and the chlorine gas is discharged from the chlorine gas collection port, and the calcium carbonate is recovered from the calcium carbonate collection box. It provides convenient conditions for collection and secondary use.

In one embodiment of the present invention, the recycling device 2 includes a casing 23, an electrodialysis membrane stack 24 and a power supply 25, the electrodialysis membrane stack 24 is arranged inside the casing 23, and the electrodialysis membrane stack 24 is used to make calcium carbonate Precipitation; the power supply 25 is arranged outside the box body 23 , and the power supply 25 is electrically connected with the box body 23 .

In this embodiment, the box body 23 includes a reaction tank, a water baffle and a fresh water tank, and the water baffle is located between the reaction tank and the fresh water tank. The electrodialysis membrane stack 24 is located in the reaction tank, and the fresh water that can be reused is obtained through the electrochemical reaction; the fresh water tank is connected with the fresh water tank 3, and the fresh water that can be produced is transported to the fresh water tank 3 for subsequent production and reuse. convenient.

In this embodiment, the electrodialysis membrane stack 24 is suitable for high-salt wastewater to perform electrolysis reaction under the action of an electric field, and can form new chemical substances in different chambers.

In this embodiment, the electrodialysis membrane stack 24 is a reactor with a four-chamber structure, the ion exchange membrane is a homogeneous ion exchange membrane, and the cathode and anode are titanium-coated ruthenium electrodes.

Fig. 2 is the schematic structural view of electrodialysis membrane stack shown in Fig. 1, as shown in Fig. 2, electrodialysis membrane stack 24 comprises negative membrane 241 and positive membrane 242, and positive membrane 242 is positioned between two negative membranes 241, and adjacent A diaphragm 243 is disposed between the positive film 242 and the negative film 241 . A cathode chamber 245 is formed between the negative film 241 and the diaphragm 243 , and an anode chamber 244 is formed between the positive film 242 and the diaphragm 243 .

When the salt solution passes through the electrolysis module, under the action of the electric field, the negative and positive ions move. Since the negative membrane 241 and the positive membrane 242 have selective permeability, that is, the positive membrane 242 only allows cations to pass freely, and the anion membrane 241 only allows anions to freely pass through. Through, therefore anion enters anode chamber 244 through anion membrane 241, forms acidic substance or gas generation in cathode chamber 245 according to different anion characteristics;

In the present embodiment, the calcium carbonate collection box 22 is positioned at the bottom of the casing 23 and communicates with the casing 23. The bottom of the casing 23 is provided with a sewage outlet 235, and the sewage outlet 235 is used to discharge the electrodialysis membrane stack 24. calcium carbonate.

In one embodiment of the present invention, the number of electrodialysis membrane stacks 24 is at least three, and the electrodialysis membrane stacks 24 are arranged in parallel. The chlorine gas collection port 21 is arranged on the upper end of the box body 23 , and each electrodialysis membrane stack 24 is provided with a chlorine gas collection port. Since chlorine is produced in the cathode chamber 245 , the chlorine gas collection port 21 is disposed above the negative membrane 241 .

In an embodiment of the present invention, both ends of the electrodialysis membrane stack 24 are provided with insulating fixing blocks 26 , and the electrodialysis membrane stack 24 is fixed inside the box body 23 through the insulating fixing blocks 26 . The connection between the box body 23 and the disturbing anion and cation can be avoided by the insulating fixing block 26 .

In one embodiment of the present invention, calcium carbonate collection box 22 is arranged on the lower end of casing 23, and calcium carbonate collection box 22 is funnel-shaped, and the bottom end of calcium carbonate collection box 22 is connected with drain valve 9.

In one embodiment of the present invention, at least three input ports 231 are provided on the tank body 23 , all of which are connected to the pipeline of the waste water tank 1 , and water inlet regulating valves 232 are provided at the input ports 231 .

In this embodiment, at least three output ports 233 are provided on the tank body 23 , and the output ports 233 are all connected to the pipeline of the fresh water tank 3 , and a water outlet regulating valve 234 is provided at each of the three output ports 233 .

In this embodiment, the input ends 231 are all located on one side wall of the box body 23 ; the three output ends 233 are all located on the other side wall of the box body 23 . Preferably, the input end 231 and the output end 233 are located on two opposite side walls of the box body 23, so that the management of water in and out is more convenient.

In this embodiment, a ball valve 4 , a water pump 5 and a check valve 6 are connected in series on the pipeline between the waste water tank 1 and each input port 231 , and the check valve 6 is used to keep the liquid in one-way flow. The water pump 5 is used to transport the high salt water in the waste water tank 1 to the tank 23 .

In this embodiment, a pressure gauge 7 and a flowmeter 8 are also arranged on the pipeline between the waste water tank 1 and the input end 231. The pressure gauge 7 is used to monitor the liquid pressure in the pipeline, and the flowmeter 8 is used to measure the pressure of the pipe. The flow of the liquid in the road, the pressure gauge 7 and the flow meter 8 are all connected in series after the check valve 6.

While the invention has been described with reference to a preferred embodiment, various modifications may be made and equivalents may be substituted for parts thereof without departing from the scope of the invention. In particular, as long as there is no structural conflict, the technical features mentioned in the various embodiments can be combined in any manner. The present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims (10)

1. a kind of calcium chloride high-salinity wastewater zero-emission processing unit, it is characterised in that including waste water tank (1), recycling unit (2) With fresh-water tank (3), the recycling unit (2) is respectively with the waste water tank (1) and the fresh-water tank (3) by pipeline phase Even, the upper end of the recycling unit (2) is provided with chlorine collection port (21) and calcium carbonate collection case (22).

2. calcium chloride high-salinity wastewater zero-emission processing unit according to claim 1, it is characterised in that the resource makeup Putting (2) includes casing (23), electrodialysis membrane stack (24) and power supply (25), and the electrodialysis membrane stack (24) is arranged on the casing (23) inside, the electrodialysis membrane stack (24) is for separating out calcium carbonate；The power supply (25) is arranged on the casing (23) Outside, the power supply (25) electrically connects with the casing (23)；

The calcium carbonate collection case (22) is connected positioned at the bottom of the casing (23) and with the casing (23).

3. calcium chloride high-salinity wastewater zero-emission processing unit according to claim 2, it is characterised in that the electrodialytic membranes The quantity of heap (24) is at least 3, and the electrodialysis membrane stack (24) is arranged in parallel；

The chlorine collection port (21) is arranged at the upper end of the casing (23), is respectively provided with each described electrodialysis membrane stack (24) There is a chlorine collection port.

4. calcium chloride high-salinity wastewater zero-emission processing unit according to claim 3, it is characterised in that the electrodialytic membranes The two ends of heap (24) are provided with insulation fixed block (26), and the electrodialysis membrane stack (24) is solid by insulation fixed block (26) Due to the inside of the casing (23).

5. the calcium chloride high-salinity wastewater zero-emission processing unit according to any one in claim 2-4, it is characterised in that The calcium carbonate collection case (22) is arranged on the lower end of the casing (23), and the calcium carbonate collection case (22) is funnel-form, institute The bottom for stating calcium carbonate collection case (22) is connected with blowoff valve (9).

6. the calcium chloride high-salinity wastewater zero-emission processing unit according to any one in claim 2-4, it is characterised in that At least provided with 3 inputs (231) on the casing (23), the input (231) connects with the waste water tank (1) pipeline Connect, input (231) place is provided with inlet regulating valve (232).

7. calcium chloride high-salinity wastewater zero-emission processing unit according to claim 6, it is characterised in that the casing (23) On at least provided with 3 output ends (233), the output end (233) is connected with the fresh-water tank (3) pipeline, the output End (233) place is provided with out water regulating valve (234).

8. calcium chloride high-salinity wastewater zero-emission processing unit according to claim 7, it is characterised in that the input (231) it is respectively positioned on one of side wall of the casing (23)；The output end (233) is respectively positioned on the another of the casing (23) On one side wall.

9. calcium chloride high-salinity wastewater zero-emission processing unit according to claim 6, it is characterised in that the waste water tank (1) ball valve (4), water pump (5) and check-valves (6) have been sequentially connected in series with the pipeline between described input (231), it is described to stop Valve (6) is returned for making liquid keep one-way flow.

10. calcium chloride high-salinity wastewater zero-emission processing unit according to claim 9, it is characterised in that the waste water tank (1) pressure gauge (7) and flowmeter (8) are additionally provided with the pipeline between the input (231), the pressure gauge (7) is used Fluid pressure in monitored pipeline, the flowmeter (8) for measuring the flow of liquid in pipeline, the pressure gauge (7) and The flowmeter (8) is series at after the check-valves (6).