CN209307143U - A zero-discharge system for high-salt and high-turbidity industrial wastewater - Google Patents

Abstract

The utility model discloses a zero-discharge system for high-salt and high-turbidity industrial waste water, which comprises a water inlet tank, a flocculation sedimentation system, a sand filter device and an electric adsorption system successively connected along the direction of waste water flow; wherein, the electric adsorption system includes several A connected capacitive deionization device; also includes a backwash system and a thermal evaporation crystallization system; the backwash system is connected with the sand filter device and the capacitive deionization device, and backwashes the sand filter device and the capacitive deionization device; the thermal evaporation crystallization system It communicates with the sand filter device and the capacitive deionization device, and performs thermal evaporation treatment on the concentrated water after backwashing by the sand filter device and the capacitive deionization device. The utility model can realize fast and efficient desalination and turbidity removal, and the whole system can run stably with low energy consumption.

Description

A zero-discharge system for high-salt and high-turbidity industrial wastewater

technical field

The utility model belongs to the field of water treatment, and relates to the treatment of high-salt and high-turbidity sewage, in particular to a zero-discharge system for high-salt and high-turbidity industrial waste water.

Background technique

Industrial wastewater is the main source of water pollution. High-salt and high-turbidity wastewater is one of the common wastewater in industrial wastewater. It has the characteristics of high turbidity, high salt content, and complex salt composition. At present, the situation of energy saving and emission reduction is becoming increasingly severe, and various environmental protection laws and regulations are gradually improving. Industrial enterprises urgently need to process wastewater through technological improvement to achieve zero discharge, reduce environmental pollution, and achieve social, economic and environmental benefits.

For high-salt and high-turbidity industrial wastewater, conventional treatment methods at home and abroad include membrane treatment, electrochemical technology and heat treatment. However, the treatment capacity of a single treatment method is limited, and the effect of removing turbidity and desalination is not ideal, and there are many limitations. Chinese Patent Grant No. CN205856210U discloses a nanofiltration-electric adsorption-reverse osmosis device for removing high-concentration saline wastewater, which is used to remove salt substances in high-concentration saline wastewater for regeneration and reuse. However, this treatment plan does not take into account the treatment of backwash water after contamination by nanofiltration membranes, reverse osmosis membranes, and electro-adsorption devices. And in order to monitor the water quality of the entire operation system in real time to ensure that the treatment effect is up to standard. Chinese Patent Publication No. CN107399864 A discloses a comprehensive treatment system and process for high-salt and oily wastewater. This patent combines a sand filter device, an ultrafiltration device and a membrane capacitive deionization device to treat high-salt and oily wastewater. However, the patent The pollution of membrane modules and electro-adsorption devices is not considered, and the water quality assurance device is not designed to ensure emergency treatment when the water quality is not up to standard. Chinese Patent Publication No. CN107381923A discloses a seawater desalination treatment device and method based on membrane capacitive deionization and membrane distillation. Membrane distillation is currently immature and consumes high energy. It is easy to cause membrane pollution when used in the field of industrial wastewater treatment, and the water flux is low. lower.

Utility model content

The utility model provides a zero-discharge system for high-salt and high-turbidity industrial wastewater to overcome the defects of the prior art.

In order to achieve the above purpose, the utility model provides a zero-discharge system for high-salt and high-turbidity industrial wastewater, which includes a water inlet tank, a flocculation sedimentation system, a sand filter device and an electro-adsorption system sequentially connected along the direction of waste water flow; wherein, the electro-adsorption The system includes several connected capacitive deionization devices; it also includes a backwashing system and a thermal evaporation crystallization system; the backwashing system is connected with the sand filter device and the capacitive deionization device, and backwashes the sand filter device and the capacitive deionization device; The thermal evaporation crystallization system is connected with the sand filter device and the capacitive deionization device, and performs thermal evaporation treatment on the concentrated water after the backwash of the sand filter device and the capacitive deionization device.

Further, the utility model provides a zero-discharge system for high-salt and high-turbidity industrial wastewater, which can also have the following features: it also includes a PLC control system and a sand filter conductivity meter; the sand filter conductivity meter is connected with the sand filter device to detect sand The conductivity of the wastewater treated by the filter device; the electro-adsorption system also includes several conductivity meters and water inlet solenoid valves; the conductivity meter corresponds to and communicates with the capacitive deionization device one by one, and the conductivity meter detects the capacitive deionization device connected to it. The conductivity of the treated wastewater in the device; the water inlet electromagnetic valve corresponds to the capacitive deionization device one by one, and is set on the water inlet pipeline to control the water inflow of the capacitive deionization device; the PLC control system monitors the sand filter conductivity meter and conductivity The data of the rate meter controls the switch of the water inlet solenoid valve.

Further, the utility model provides a zero-discharge system for high-salt and high-turbidity industrial wastewater, which can also have the following characteristics: wherein, the electrosorption system also includes several intermediate water tanks; the intermediate water tanks correspond to the capacitance deionization device one by one, and The outlet is connected, and the wastewater treated by the capacitive deionization device flows into the intermediate water tank; the conductivity meter is connected with the intermediate water tank to measure the conductivity of the wastewater in it.

Further, the utility model provides a zero-discharge system for high-salt and high-turbidity industrial wastewater, which may also have the following characteristics: wherein, there are three capacitive deionization devices and three intermediate water tanks, which are respectively connected sequentially along the direction of wastewater inflow. The first-stage capacitive deionization device, the first-stage intermediate water tank, the second-stage capacitive deionization device, the second-stage intermediate water tank, the third-stage capacitive deionization device, and the third-stage intermediate water tank; the number of water inlet electromagnetic valves is three, respectively The water inlet solenoid valve, the secondary water inlet solenoid valve and the tertiary water inlet solenoid valve are respectively set on the water inlet pipelines of the first-stage capacitive deionization device, the second-stage capacitive deionization device and the third-stage capacitive deionization device to control the water inlet Water volume; the number of conductivity meters is three, namely the first-level conductivity meter, the second-level conductivity meter and the third-level conductivity meter, which are respectively connected with the first-level intermediate water tank, the second-level intermediate water tank and the third-level intermediate water tank. The electrical conductivity of the wastewater in it; the three-stage intermediate water tank is connected with the backwash system to provide it with backwash clean water; the electro-adsorption system also includes a water outlet electromagnetic valve, which is set on the outlet pipe of the three-stage intermediate water tank to control the backwash system. Washing water volume; PLC control system monitors the data of the sand filter conductivity meter, the first-level conductivity meter, the second-level conductivity meter and the third-level conductivity meter, and controls the first-level water inlet electromagnetic valve, the second-level water inlet electromagnetic valve, Three-stage water inlet solenoid valve and water outlet solenoid valve switch.

Further, the utility model provides a zero-discharge system for high-salt and high-turbidity industrial wastewater, which can also have the following characteristics: wherein, the backwashing system includes a backwashing water tank and several backwashing water pumps, a backwashing water tank, a sand filter device and a capacitor The deionization devices are connected separately, and the backwash clean water is pumped into them through the corresponding backwash water pump.

Furthermore, the utility model provides a zero-discharge system for high-salt and high-turbidity industrial wastewater, which may also have the following feature: wherein, the condensed water produced by condensation in the thermal evaporation crystallization system is transported to the backwashing system for reuse.

Further, the utility model provides a zero-discharge system for high-salt and high-turbidity industrial wastewater, which may also have the following features: it also includes a concentrated water tank and a concentrated water tank pump; the concentrated water tank is connected with a sand filter device and a capacitive deionization device, Receiving and storing the concentrated water after backwashing by the sand filter device and the capacitive deionization device; the concentrated water tank is also connected with the thermal evaporation crystallization system, and the concentrated water to be treated is delivered to it through the concentrated water tank pump.

Further, the utility model provides a zero-discharge system for high-salt and high-turbidity industrial wastewater, which can also have the following characteristics: wherein, the flocculation and sedimentation system includes a sedimentation tank, a sludge pump and a sludge drying tank; The water tank is connected to the sand filter device, flocculant is put into the sedimentation tank to remove suspended solids and grease substances in the wastewater, and the wastewater after flocculation and sedimentation treatment is transported to the sand filter device; the sedimentation tank is connected to the sludge drying tank, and the sludge pump is set Between the sedimentation tank and the sludge drying tank, the sludge settled in the sedimentation tank is pumped into the sludge drying tank.

Further, the utility model provides a zero-discharge system for high-salt and high-turbidity industrial wastewater, which may also have the following characteristics: it also includes an inlet pump, which is arranged between the inlet water tank and the flocculation and sedimentation system, and pumps the waste water in the inlet water tank into the flocculation and sedimentation system.

Further, the utility model provides a zero-discharge system for high-salt and high-turbidity industrial wastewater, which may also have such a feature: it also includes a sedimentation pump, which is arranged between the flocculation sedimentation system and the sand filter device, and the wastewater treated by the flocculation sedimentation system Pump into sand filter unit.

The beneficial effects of the utility model are: the utility model provides a zero-discharge system for high-salt and high-turbidity industrial wastewater, including a water inlet tank, a flocculation sedimentation system, an electric adsorption system, a sand filter device, a backwash system, a thermal evaporation crystallization system and PLC control system. Among them, the flocculation sedimentation system and sand filter device remove suspended solids and organic matter in industrial wastewater, and do pretreatment for the electro-adsorption system. The backwashing system is used to clean the sand filter device and the electric adsorption system, prolong the service life of the system, and ensure its desalination and turbidity removal effect. The thermal evaporation crystallization system concentrates the high-salt concentrated water produced by the backwash of the entire system to prepare waste salt for treatment. The electro-adsorption system adsorbs and removes salt ions in industrial wastewater. The PLC control system conducts real-time intelligent monitoring of the entire system, and performs emergency treatment for the processing system that does not meet the standards to ensure the stability of operation. The zero-discharge system for high-salt and high-turbidity industrial wastewater provided by the utility model can realize fast and efficient desalination and turbidity removal, and the whole system can run stably. The thermal evaporation crystallization process and capacitive deionization adsorption process are adopted with low energy consumption, which is beneficial to actual production and application. Very good reference.

Description of drawings

Figure 1 is a schematic diagram of a zero-discharge system for high-salt and high-turbidity industrial wastewater.

Detailed ways

The specific embodiment of the utility model is described below in conjunction with accompanying drawing.

As shown in Figure 1, the utility model provides a zero-discharge system for high-salt and high-turbidity industrial wastewater, which includes a water inlet tank 100, a flocculation and sedimentation system, a sand filter device 300, and an electric adsorption system connected sequentially along the direction of wastewater flow. It includes backwashing system, concentrated water tank 600, thermal evaporation crystallization system 700 and PLC control system 800.

A water inlet pump 110 is arranged between the water inlet tank 100 and the flocculation sedimentation system, and the water inlet pump 110 pumps the waste water in the water inlet tank 100 into the flocculation sedimentation system.

The flocculation and sedimentation system includes a sedimentation tank 200 , a sludge pump 210 and a sludge drying tank 220 .

Wherein, the sedimentation tank 200 communicates with the water inlet tank 100 and the sand filter device 300 respectively. The waste water flows into the sedimentation tank 200 from the water inlet tank 100 for sedimentation treatment. A flocculant is placed in the sedimentation tank 200 to remove suspended solids and grease substances in the wastewater. A sedimentation water pump 230 is provided between the sedimentation tank 200 and the sand filter device 300 to pump the wastewater treated in the sedimentation tank 200 into the sand filter device 300 .

The sedimentation tank 200 communicates with the sludge drying tank 220 , and the sludge pump 210 is arranged between the sedimentation tank 200 and the sludge drying tank 220 , and pumps the sludge settled in the sedimentation tank 200 into the sludge drying tank 220 . The sludge drying tank 220 performs drying treatment on the sludge, and the dried sludge can be outsourced for disposal or other post-processing operations.

The sand filter device 300 performs sand filter treatment on the wastewater to further remove suspended solids in the wastewater. The lower filter material in the sand filter device 300 is a garnet filter material with a diameter of 1-2 mm, and the upper filter material is a quartz sand filter material with a diameter of 0.5-1.2 mm.

The system also includes a sand filter conductivity meter 310 . The sand filter conductivity meter 310 is connected to the sand filter device 300 to detect the conductivity of the wastewater treated by the sand filter device 300 .

The electro-adsorption system includes three sets of capacitive deionization devices, intermediate water tanks, water inlet electromagnetic valves and conductivity meters, which are respectively the primary capacitive deionization device 410, the primary intermediate water tank 411, and the secondary capacitive deionization device connected sequentially along the direction of wastewater inflow. Ionization device 420, secondary intermediate water tank 421, tertiary capacitive deionization device 430 and tertiary intermediate water tank 431; the three water inlet solenoid valves are respectively primary water inlet electromagnetic valve 412, secondary water inlet electromagnetic valve 422 and third stage The water inlet electromagnetic valve 432 is respectively arranged on the water inlet pipelines of the first-stage capacitive deionization device 410, the second-stage capacitive deionization device 420 and the third-stage capacitive deionization device 430 to control the water inflow; the three conductivity meters are respectively a The first-level conductivity meter 413, the second-level conductivity meter 423 and the third-level conductivity meter 433 are respectively connected with the first-level intermediate water tank 411, the second-level intermediate water tank 421 and the third-level intermediate water tank 431 to measure the conductivity of the waste water therein.

The tertiary intermediate water tank 431 communicates with the backwashing system to provide clean water for backwashing.

The electro-adsorption system also includes a water outlet electromagnetic valve 434, which is arranged on the water outlet pipeline of the three-stage intermediate water tank 431, and controls the amount of clean water for backwashing of the backwashing system.

The backwashing system includes a backwashing water tank 500 and four backwashing water pumps 510 . Wherein, the backwash water tank 500 communicates with the sand filter device 300 , the first-stage capacitive deionization device 410 , the second-stage capacitive deionization device 420 and the third-stage capacitive deionization device 430 . Four backwash water pumps 510 are respectively arranged on the pipelines in which the backwash water tank 500 communicates with the sand filter device 300, the first-stage capacitive deionization device 410, the second-stage capacitive deionization device 420, and the third-stage capacitive deionization device 430. 500 pumps backwash clean water into the sand filter device 300, the primary capacitive deionization device 410, the secondary capacitive deionization device 420 and the tertiary capacitive deionization device 430 through the backwash water pump 510 to provide them with backwashing treatment.

Concentrated water tank 600 communicates with sand filter device 300 , first-stage capacitive deionization device 410 , second-stage capacitive deionization device 420 and third-stage capacitive deionization device 430 to receive and store concentrated water after backwashing.

The concentrated water tank 600 is also connected with the thermal evaporation crystallization system 700, and a concentrated water tank pump 610 is arranged between the concentrated water tank 600 and the thermal evaporation crystallization system 700, and the concentrated water tank 600 is transported to the thermal evaporation crystallization system 700 through the concentrated water tank pump 610 Concentrated water to be treated.

The thermal evaporation and crystallization system 700 heat-treats the concentrated water after backwashing, and the waste salt produced by crystallization can be outsourced for disposal or other post-processing operations. The condensed water generated by condensation in the thermal evaporation crystallization system 700 is sent to the backwash water tank 500 for reuse.

The PLC control system 800 monitors the data of the sand filter conductivity meter 310, the first-level conductivity meter 413, the second-level conductivity meter 423 and the third-level conductivity meter 433, and controls the first-level water inlet electromagnetic valve 412 and the second-level water inlet electromagnetic valve. Switches of the valve 422, the three-stage water inlet solenoid valve 432 and the water outlet solenoid valve 434.

In this embodiment, the number of stages of the electro-adsorption system can be changed according to actual needs, that is, the number of capacitive deionization devices, intermediate water tanks, water inlet electromagnetic valves and conductivity meters can be set according to the salt content of wastewater and the treatment load. It only needs to be satisfied: the intermediate water tank, water inlet electromagnetic valve and conductivity meter are all in one-to-one correspondence with the capacitive deionization device, the water inlet electromagnetic valve is set on the water inlet pipeline of the capacitor deionization device, and the intermediate water tank and the outlet of the capacitor deionization device Connected, the conductivity meter is connected with the intermediate water tank to measure the conductivity of the wastewater treated by the capacitive deionization device.

When the system is in use, the waste water in the water inlet tank 100 flows into the sedimentation tank 200 in the flocculation and sedimentation system through the water inlet pump 110, and undergoes flocculation and sedimentation treatment to remove suspended solids and grease substances in the waste water.

The wastewater after flocculation and sedimentation treatment flows into the sand filter device 300 through the sedimentation water pump 230, and is subjected to sand filtration treatment to further remove suspended matter.

The waste water treated by sand filtration enters the electro-adsorption system, and then flows into the first-stage capacitive deionization device 410, the first-stage intermediate water tank 411, the second-stage capacitive deionization device 420, the second-stage intermediate water tank 421, the third-stage capacitive deionization device 430 and the third-stage capacitive deionization device. An intermediate water tank 431 is used for electro-adsorption treatment.

All the clean water after electro-adsorption treatment flows into the backwash water tank 500 in the backwash system to provide backwash clean water for the backwash system.

The time interval for the backwashing system to backwash the sand filter device 300 is 40 minutes, and the flushing time is 40s.

The PLC control system monitors the data of the sand filter conductivity meter 310 , the primary conductivity meter 413 , the secondary conductivity meter 423 and the tertiary conductivity meter 433 .

When the conductivity value measured by the primary conductivity meter 413 is greater than 50% of the conductivity value measured by the sand filter conductivity meter 310, the PLC control system closes the primary water inlet electromagnetic valve 412 and the secondary water inlet electromagnetic valve 422 , performing desorption and cleaning treatment on the primary capacitive deionization device 410 . After processing, open the primary water inlet solenoid valve 412, if the conductivity value measured by the primary conductivity meter 413 is less than 50% of the conductivity value measured by the sand filter conductivity meter 310, then open the secondary water inlet solenoid valve 422 If the conductivity value recorded by the first-level conductivity meter 413 is still greater than 50% of the conductivity value measured by the sand filter conductivity meter 310, then close the first-level water inlet electromagnetic valve 412, and the first-level capacitance deionization device 410 Continue the desorption cleaning treatment until the conductivity value of the treated wastewater reaches the standard.

When the conductivity value measured by the secondary conductivity meter 423 is greater than 20% of the conductivity value measured by the sand filter conductivity meter 310, the PLC control system closes the secondary water inlet solenoid valve 422 and the third stage water inlet solenoid valve 432 , performing desorption and cleaning treatment on the secondary capacitive deionization device 420 . After processing, open the secondary water inlet solenoid valve 422, if the conductivity value measured by the secondary conductivity meter 423 is less than 20% of the conductivity value measured by the sand filter conductivity meter 310, then open the third stage water inlet solenoid valve 433 If the conductivity value recorded by the secondary conductivity meter 423 is still greater than 20% of the conductivity value recorded by the sand filter conductivity meter 310, then close the secondary water inlet electromagnetic valve 422, and the secondary capacitance deionization device 420 Continue the desorption cleaning treatment until the conductivity value of the treated wastewater reaches the standard.

When the conductivity value measured by the three-stage conductivity meter 433 is greater than 10% of the conductivity value measured by the sand filter conductivity meter 310, the PLC control system closes the three-stage water inlet solenoid valve 432 and the water outlet solenoid valve 434. The first-stage capacitive deionization device 430 performs desorption and cleaning treatment. Open the third-stage water inlet electromagnetic valve 432 after processing, if the conductivity value measured by the third-stage conductivity meter 433 is less than 10% of the conductivity value measured by the sand filter conductivity meter, then open the water outlet electromagnetic valve 434; If the conductivity value measured by the conductivity meter 433 is still greater than 10% of the conductivity value measured by the sand filter conductivity meter 310, then the third-stage water inlet electromagnetic valve 432 is closed, and the third-stage capacitive deionization device 430 is continuously desorbed Cleaning treatment until the conductivity value of the treated wastewater reaches the standard.

Among them, the desorption and cleaning process of the first-stage capacitive deionization device 410, the second-stage capacitive deionization device 420, and the third-stage capacitive deionization device 430 is reversely connected to the external power supply for 20 minutes, and then backwashed by the backwashing system for 10 minutes.

Sand filter device 300, first-stage capacitive deionization device 410, second-stage capacitive deionization device 420, and third-stage capacitive deionization device 430 carry out backwashing. The concentrated water flows into the concentrated water tank 600 and is then transported by the concentrated water tank pump 610. To the thermal evaporation crystallization system 700, the thermal evaporation crystallization system 700 performs evaporation crystallization heat treatment on the backwash concentrated water.

In this embodiment, part of the clean water after electro-adsorption treatment may also flow into the backwashing system, and the remaining part may be discharged to other required system processes.

Claims (10)

1. A zero-discharge system for high-salt and high-turbidity industrial wastewater, characterized in that: Including water inlet tanks, flocculation and sedimentation systems, sand filter devices and electro-adsorption systems connected sequentially along the direction of waste water flow; Wherein, the electrosorption system includes several connected capacitive deionization devices; It also includes backwashing system and thermal evaporation crystallization system; The backwashing system is communicated with the sand filter device and the capacitive deionization device, and backwashes the sand filter device and the capacitive deionization device; The thermal evaporation crystallization system communicates with the sand filter device and the capacitive deionization device, and performs thermal evaporation treatment on the concentrated water after the sand filter device and the capacitive deionization device are backwashed. 2. The zero-discharge system for high-salt and high-turbidity industrial wastewater according to claim 1, characterized in that: It also includes PLC control system and sand filter conductivity meter; The sand filter conductivity meter is connected with the sand filter device to detect the conductivity of the wastewater treated by the sand filter device; The electro-adsorption system also includes several conductivity meters and water inlet electromagnetic valves; The conductivity meter is in one-to-one correspondence with the capacitive deionization device and connected, and the conductivity meter detects the conductivity of the treated wastewater of the capacitive deionization device connected thereto; The water inlet electromagnetic valve corresponds to the capacitive deionization device one by one, and is arranged on its water inlet pipeline to control the water intake of the capacitive deionization device; The PLC control system monitors the sand filter conductivity meter and the data of the conductivity meter, and controls the switch of the water inlet electromagnetic valve. 3. The zero-discharge system for high-salt and high-turbidity industrial wastewater according to claim 2, characterized in that: Wherein, the electro-adsorption system also includes several intermediate water tanks; The intermediate water tank is in one-to-one correspondence with the capacitive deionization device and communicated with its outlet, and the wastewater treated by the capacitive deionization device flows into the intermediate water tank; The conductivity meter communicates with the intermediate water tank to measure the conductivity of the waste water therein. 4. The zero discharge system for high-salt and high-turbidity industrial wastewater according to claim 3, characterized in that: Wherein, the number of the capacitive deionization device and the intermediate water tank is three, which are the first-stage capacitive deionization device, the first-stage intermediate water tank, the second-stage capacitive deionization device, and the second-stage intermediate water tank, which are sequentially connected along the direction of wastewater inflow. , Three-stage capacitive deionization device and three-stage intermediate water tank; The number of the water inlet electromagnetic valves is three, which are the first-level water inlet electromagnetic valve, the second-level water inlet electromagnetic valve and the third-level water inlet electromagnetic valve, which are respectively arranged in the first-level capacitor deionization device and the second-level capacitor On the water inlet pipeline of the deionization device and the three-stage capacitive deionization device, the water intake is controlled; The number of the conductivity meter is three, which are respectively the first-level conductivity meter, the second-level conductivity meter and the third-level conductivity meter, which are respectively connected with the first-level intermediate water tank, the second-level intermediate water tank and the third-level intermediate water tank , to measure the conductivity of the wastewater in it; The three-stage intermediate water tank communicates with the backwashing system to provide backwashing water; The electro-adsorption system also includes a water outlet electromagnetic valve, which is arranged on the water outlet pipeline of the three-stage intermediate water tank to control the amount of backwash water in the backwash system; The PLC control system monitors the data of the sand filter conductivity meter, the first-level conductivity meter, the second-level conductivity meter and the third-level conductivity meter, and controls the first-level water inlet electromagnetic valve, the second-level water inlet electromagnetic valve, Three-stage water inlet solenoid valve and water outlet solenoid valve switch. 5. The zero-discharge system for high-salt and high-turbidity industrial wastewater according to claim 1, characterized in that: Wherein, the backwashing system includes a backwashing water tank and several backwashing water pumps, the backwashing water tank is respectively communicated with the sand filter device and the capacitive deionization device, and backwashing clean water is pumped into it through corresponding backwashing water pumps. 6. The zero-discharge system for high-salt and high-turbidity industrial wastewater according to claim 1, characterized in that: Wherein, the condensed water produced by condensation in the thermal evaporation crystallization system is transported to the backwashing system for reuse. 7. The zero-discharge system for high-salt and high-turbidity industrial wastewater according to claim 1, characterized in that: Concentrate tanks and concentrate tank pumps are also included; The concentrated water tank is connected with the sand filter device and the capacitive deionization device, and receives and stores the concentrated water after backwashing by the sand filter device and the capacitive deionization device; The concentrated water tank is also connected with the thermal evaporation crystallization system, and the concentrated water to be treated is delivered to it by the pump of the concentrated water tank. 8. The zero-discharge system for high-salt and high-turbidity industrial wastewater according to claim 1, characterized in that: Wherein, the flocculation sedimentation system includes a sedimentation tank, a sludge pump and a sludge drying tank; The sedimentation tank is respectively connected with the water inlet tank and the sand filter device, and a flocculant is placed in the sedimentation tank to remove suspended solids and grease substances in the wastewater, and the wastewater after the flocculation and sedimentation treatment is transported to the sand filter device; The sedimentation tank communicates with the sludge drying tank, and the sludge pump is arranged between the sedimentation tank and the sludge drying tank, and pumps the sludge settled in the sedimentation tank into the sludge drying tank. 9. The zero-discharge system for high-salt and high-turbidity industrial wastewater according to claim 1, characterized in that: It also includes a water inlet pump, which is arranged between the water inlet water tank and the flocculation sedimentation system, and pumps the waste water in the water inlet water tank into the flocculation sedimentation system. 10. The zero discharge system for high-salt and high-turbidity industrial wastewater according to claim 1, characterized in that: It also includes a sedimentation water pump, which is arranged between the flocculation sedimentation system and the sand filter device, and pumps the wastewater treated by the flocculation sedimentation system into the sand filter device.