CN112551818B - High-salinity organic wastewater treatment system and treatment method - Google Patents

Abstract

The invention provides a high-salinity organic wastewater treatment system which comprises a high-salinity wastewater inlet, a low-salinity wastewater inlet, a standard water discharge port, a forward osmosis device and an organic matter treatment device, wherein the forward osmosis device is divided into a first side area and a second side area, the first side area and the second side area are independent of each other and can only carry out mass transfer through a forward osmosis membrane, the high-salinity wastewater inlet is communicated with the first side area, a water outlet of the first side area is communicated with the organic matter treatment device, the low-salinity wastewater inlet is communicated with the organic matter treatment device, a water outlet of the organic matter treatment device is communicated with the second side area, and a water outlet of the second side area is communicated with the standard water discharge port. The high-salinity organic wastewater treatment system and the treatment method provided by the invention have lower treatment cost.

Description

A kind of high-salt organic wastewater treatment system and treatment method

technical field

The invention belongs to the technical field of high-salt wastewater treatment, and in particular relates to a high-salt organic wastewater treatment system and a treatment method.

Background technique

High-salt organic wastewater is one of the most difficult wastewaters to treat. Due to the high salt concentration, usually more than 10%, conventional sewage treatment bacteria cannot survive and degrade organic pollutants at such a high salt concentration, while the colony structure of halophilic bacteria or halophilic bacteria is unbalanced, the colony is single, and the pollutants are degraded. The ability is poor, so the biochemical treatment of high-salt organic wastewater is difficult, and the industrial application is still relatively difficult. However, the use of advanced oxidation methods, such as ozone oxidation and electrocatalytic oxidation, has low treatment efficiency, high cost, and cannot be completely treated. The Fenton oxidation method is used to treat high-salt wastewater. Due to the high organic matter in the wastewater, a large amount of iron sludge will be generated, which needs to be disposed of as hazardous waste, and the disposal cost is high. Due to the high cost of advanced oxidation and the inability to biochemically treat and degrade, under the current environmental pressure, enterprises can only crystallize salt through evaporation, and then treat the evaporated wastewater. The solid salt produced by evaporation and crystallization contains a large amount of organic matter, which needs to be disposed of as hazardous waste, and the cost is as high as several thousand yuan or even ten thousand yuan per ton. The comprehensive disposal cost of this method is high.

The invention patent is a biochemical treatment process for high-salt wastewater (CN104150608A), which discloses a biochemical treatment process for high-salt wastewater. It mainly includes the following steps: 1) obtaining salt-tolerant bacteria and attaching to the packing in the reactor; 2) configuring different simulated wastewater; 3) domesticating the salt-tolerant bacteria; mixing simulated wastewater and high-salt wastewater in different proportions to prepare various domestication Using waste water, during the start-up process of the reactor, the salt-tolerant bacteria were domesticated through a variety of domestication waste water in the order of the simulated waste water content in the domestication waste water from high to low, so as to shorten the start-up time of the reactor; 4) The domesticated Nanyang The county directly treats the high-salt wastewater. The wastewater concentration required in this patent is 3-5%, not more than 6%. Using this patent, it is still impossible to treat the high-salt wastewater generated in the fields of medicine, pesticide and fine chemical industry, because the salinity of these high-salt wastewater is more than 10%. Moreover, the domesticated salt-tolerant bacteria were different from those of conventional biochemical sewage, and the removal efficiency was reduced.

In the actual wastewater treatment projects, some enterprises dilute the wastewater after treatment, but the enterprises have control of the total amount of drainage. After biochemical treatment, the wastewater needs to be further concentrated, and reverse osmosis is often used for concentration. The concentration cost is high and requires huge investment.

The information disclosed in this Background section is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person skilled in the art.

SUMMARY OF THE INVENTION

In view of the deficiencies of the prior art, the present invention provides a high-salt organic wastewater treatment system and a treatment method with lower treatment cost.

The present invention provides a high-salt organic waste water treatment system, comprising a high-salt waste water inlet, a low-salt waste water inlet, a standard-compliant water discharge outlet, a forward osmosis device and an organic matter treatment device, wherein the forward osmosis device is divided into a first side area and a The second side area, the first side area and the second side area are independent of each other, and can only carry out mass transfer through the forward osmosis membrane, the high-salt wastewater inlet is connected to the first side area, and the first side area The water outlet is communicated with the organic matter treatment device, the low-salt wastewater inlet is communicated with the organic matter treatment device, the water outlet of the organic matter treatment device is communicated with the second side area, and the water outlet in the second side area is communicated with the water outlet. Describe the discharge outlet of up to standard water.

Preferably, the high-salt organic wastewater treatment system further comprises a pretreatment device, an electrocatalytic device and a membrane filtration device, and the high-salt wastewater inlet, pretreatment device, electrocatalytic device, membrane filtration device and the first side area are The water flow directions are connected in sequence, and the membrane filtration device is one or more of column ultrafiltration, column microfiltration, submerged ultrafiltration and submerged microfiltration.

Preferably, the salt concentration in the first side area is always greater than the salt concentration in the second side area, and the salt concentration of the water flowing out of the water outlet of the first side area is less than that of the high-salt wastewater inlet. The salt concentration in the wastewater, the salt concentration in the water flowing out of the water outlet of the first side area is less than 3%.

Preferably, the organic matter treatment device includes a hydrolysis and acidification tank and a membrane bioreactor, the low-salt wastewater inlet is connected to the hydrolysis and acidification tank, and the water outlet of the hydrolysis and acidification tank is connected to the membrane bioreactor. The water outlet of the membrane bioreactor communicates with the second side region.

Preferably, the return port of the membrane bioreactor communicates with the hydrolysis and acidification tank.

Preferably, the hydrolysis and acidification tank has biological fillers, and the membrane bioreactor has activated carbon.

The invention provides a method for treating high-salt organic wastewater, comprising the following steps:

First, the low-salt wastewater is introduced into the organic matter treatment device, and the water treated by the organic matter treatment device is passed into the second side area of the forward osmosis device,

The high-salt wastewater is introduced into the first side area of the forward osmosis device, the first side area and the second side area are independent of each other, and mass transfer can only be carried out through the forward osmosis membrane;

The water in the second side area will flow to the first side through the forward osmosis membrane to dilute the high-salt wastewater in the first side, and the diluted wastewater will flow into the organic matter treatment device to be mixed with the introduced low-salt wastewater, and then pass through again after treatment. The second side of the forward osmosis device realizes circulating treatment, and the water in the second side area will also be discharged through the water outlet.

Preferably, the salt concentration of the high-salt wastewater is greater than 4%, the salt concentration of the low-salt wastewater is less than 3%, and the water intake of the low-salt wastewater is not less than 10% of the high-salt wastewater.

Preferably, the salt concentration of the high-salt wastewater is greater than 6%, and the salt concentration of the low-salt wastewater is less than 2%.

Preferably, before the high-salt wastewater is introduced into the forward osmosis device, it further comprises the steps of performing pretreatment, electrocatalysis and membrane filtration in sequence;

The organic matter treatment device includes a hydrolysis and acidification tank and a membrane bioreactor. The diluted waste water from the first side first flows into the hydrolysis and acidification tank, and then flows into the membrane bioreactor. Water flows into the second side area, the dissolved oxygen in the hydrolysis and acidification tank is controlled below 0.5mg/L, the water residence time is 12-150h, the membrane bioreactor controls the dissolved oxygen at 2-5mg/L, and the water stays The time is 18-90h.

The high-salt organic wastewater treatment system and the treatment method provided by the invention have lower treatment cost.

Description of drawings

The above and other objects, features and advantages of the present invention will become more apparent from a more detailed description of the preferred embodiments of the present invention shown in the accompanying drawings. The same reference numerals refer to the same parts throughout the drawings, and the drawings have not been intentionally drawn to scale, the emphasis being placed on illustrating the subject matter of the present invention.

FIG. 1 is a schematic structural diagram of a high-salt organic wastewater treatment system provided by one embodiment of the present invention.

FIG. 2 is a schematic structural diagram of a high-salt organic wastewater treatment system provided by another embodiment of the present invention.

FIG. 3 is a schematic flowchart according to Embodiment 1 of the present invention.

Detailed ways

The technical solutions of the present invention are further described in detail below with reference to specific embodiments, so that those skilled in the art can better understand the present invention and implement them, but the examples are not intended to limit the present invention.

1-2, an embodiment of the present invention provides a high-salt organic waste water treatment system, including a high-salt waste water inlet, a low-salt waste water inlet, a standard-compliant water discharge outlet, a forward osmosis device 4 and an organic matter treatment device, the forward osmosis device 4 is divided into a first side area 41 and a second side area 42, the first side area 41 and the second side area 42 are independent of each other, and can only be used for mass transfer through the forward osmosis membrane, and the high-salt wastewater inlet is connected to the first side area 41. The water outlet of the first side area 41 is connected to the organic matter treatment device, the low-salt waste water inlet is connected to the organic matter treatment device, the water outlet of the organic matter treatment device is connected to the second side area 42, and the water outlet of the second side area 42 is connected to the standard water discharge port.

The high-salt organic wastewater treatment system provided in this embodiment is divided into a first side area 41 and a second side area 42 by the forward osmosis device 4, and the high-salt wastewater enters the first side area, because the salt concentration is high, the second side area The water in 42 will flow to the first side area 41 through the forward osmosis membrane, so that the high-salt wastewater in the first side area 41 is diluted, and the diluted high-salt wastewater enters the organic matter treatment device. Good sewage treatment effect. In this embodiment, the low-salt wastewater directly enters the organic matter treatment device and is treated together with the wastewater diluted with high salt to achieve higher treatment efficiency. The water treated by the organic matter treatment device flows into the second side area 42, so that the second side area The salt concentration of 42 can be continuously guaranteed to be lower than the salt concentration of the high-salt wastewater entering the first side area 41, further enabling the water in the second side area 42 to continuously enter the first side area 41 to dilute the high-salt wastewater.

In this embodiment, low-salinity wastewater such as living sewage and high-salinity wastewater are separated and treated by quality, and after low-salinity wastewater such as domestic sewage is treated, dilution water can be continuously provided for high-salinity wastewater. The salt concentration of the wastewater is low, and it can be treated by the organic matter treatment device together with the low-salt wastewater, which can achieve a better water treatment effect and greatly reduce the cost of water treatment.

Compared with the dilution biochemical method, the high-salt organic wastewater treatment system provided in this embodiment utilizes the feature of higher concentration of raw water, and adopts forward osmosis to realize only adjustment of the concentration of wastewater. The concentration side enters the high concentration side, which realizes the dilution of raw water with low energy consumption. After biochemical treatment, the concentration is automatically realized without the high-pressure pump required for reverse osmosis, and the energy consumption is reduced.

Compared with the existing physicochemical-chemical treatment process, the high-salt organic wastewater treatment system provided in this embodiment realizes the biochemical treatment of high-salt wastewater, and the treatment cost is reduced by more than 60%.

Compared with the dilution method, the high-salt organic wastewater treatment system provided in this embodiment does not increase the external drainage volume and reduces the sewage discharge pressure of the enterprise.

In this embodiment, the self-adjustment function of the salinity of the wastewater is realized through the forward osmosis system, and the wastewater with high salinity is converted into wastewater with lower salinity. Therefore, conventional biochemical bacteria can be used for treatment, the microbial colonies can grow normally, the system is more stable, and the treatment effect is better.

1-2, in a preferred embodiment, the high-salt organic wastewater treatment system further includes a pretreatment device 1, an electrocatalytic device 2 and a membrane filtration device 3, a high-salt wastewater inlet, a pretreatment device 1, and an electrocatalytic device 2 , The membrane filtration device 3 and the first side area 41 are communicated in sequence along the water flow direction, and the membrane filtration device 3 is one or more of column ultrafiltration, column microfiltration, submerged ultrafiltration and submerged microfiltration. The high-salt wastewater first removes suspended solids and grease through pretreatment such as flocculation sedimentation or air flotation in the pretreatment device 1, and then enters the electrocatalytic device 2, where the toxic organic matter in the high-salt wastewater in electrocatalysis will be degraded into small molecules , remove toxicity, and remove tiny particles through membrane filtration device 3. In a further preferred embodiment, the membrane filtration device 3 can use a column-type ultrafiltration membrane or a submerged ultrafiltration membrane for filtration. The water of the membrane filtration device 3 flows into the first side area 41 and is diluted by the water of the second side area 42, and the salt concentration decreases, so that the organic matter treatment device can achieve better treatment and can better remove the COD of the raw water.

1-2, in the preferred embodiment, the salt concentration in the first side region 41 is always greater than the salt concentration in the second side region 42, so that the moisture in the second side region 42 can flow through the forward osmosis membrane to The first side area 41 dilutes the high-salt wastewater in the first side area 41 . The salt concentration of the water flowing out of the water outlet of the first side area 41 is lower than that of the high-salt waste water inlet, and the salt concentration of the water flowing out of the water outlet of the first side area 41 is less than 3%, which can better realize the organic matter treatment device. It can achieve better treatment and avoid high salt concentration and affect the activity of bacterial flora.

1-2, in a preferred embodiment, the organic matter treatment device includes a hydrolysis acidification tank 5 and a membrane bioreactor 6, the low-salt wastewater inlet is connected to the hydrolysis acidification tank 5, and the water outlet of the hydrolysis acidification tank 5 is connected to the membrane bioreactor. 6. The water outlet of the membrane bioreactor 6 communicates with the second side region 42 . In this embodiment, the high-salt waste water entering the first side area 41 is diluted and firstly enters the hydrolysis and acidification tank 5 for processing, and then enters the membrane bioreactor 6 for processing, and is processed by the hydrolysis and acidification tank 5 and the membrane bioreactor 6 High COD removal rate can be achieved.

Referring to FIG. 2 , in a preferred embodiment, the return port of the membrane bioreactor 6 communicates with the hydrolysis and acidification tank 5 . In this embodiment, the treated water of the membrane bioreactor 6 will also return to the hydrolysis and acidification tank 5 to further dilute the salt concentration in the hydrolysis and acidification tank 5, so that the hydrolysis and acidification tank 5 has a better water treatment effect.

In a preferred embodiment, the hydrolysis acidification tank 5 has biological fillers, and the membrane bioreactor 6 has activated carbon.

In a preferred embodiment, before the system starts to circulate, a certain amount of tap water is added to the hydrolysis and acidification tank 5 and the membrane bioreactor 6 to mix with the original wastewater to control the salinity in the initial biochemical system to be less than 2%.

The embodiment of the present invention also provides a high-salt organic wastewater treatment method, comprising the following steps:

First, the low-salt wastewater is introduced into the organic matter treatment device, and the water treated by the organic matter treatment device is passed into the second side area 42 of the forward osmosis device 4,

The high-salt wastewater is introduced into the first side area 41 of the forward osmosis device 4, and the first side area 41 and the second side area 42 are independent of each other, and can only carry out mass transfer through the forward osmosis membrane;

The water in the second side area 42 will flow to the first side through the forward osmosis membrane to dilute the high-salt wastewater in the first side. The diluted wastewater flows into the organic matter treatment device and is mixed with the introduced low-salt wastewater. It enters the second side of the forward osmosis device 4 to realize the circulation treatment, and the water in the second side area 42 will also be discharged through the water outlet.

In a preferred embodiment, the salt concentration of the high-salt wastewater is greater than 4%, the salt concentration of the low-salt wastewater is less than 3%, and the influent amount of the low-salt wastewater is not less than 10% of the influent amount of the high-salt wastewater. In general pharmaceutical and pesticide fine chemical industry production enterprises, the amount of low-salt wastewater does not exceed 50% of that of high-salt wastewater, which generally meets the requirement that the inflow of low-salt wastewater in this embodiment is not less than 10% of that of high-salt wastewater. In this embodiment, the high-salt wastewater and the low-salt wastewater are collected by quality, which provides conditions for the self-adjustment of the concentration of the high-salt wastewater.

Further in a preferred embodiment, the salt concentration of the high-salt wastewater is greater than 6%, and the salt concentration of the low-salt wastewater is less than 2%. In a further preferred embodiment, the salt concentration of the high-salt wastewater is greater than 10%. The high-salt organic wastewater treatment method and treatment system of this embodiment are particularly suitable for the treatment of high-salt wastewater, and the high-salt wastewater has a higher salt concentration. Moisture in the second side region 42 continuously flows into the first side region 41 to dilute the high-salt wastewater.

In a preferred embodiment, the organic matter treatment device includes a hydrolysis and acidification tank 5 and a membrane bioreactor 6, and the diluted wastewater on the first side first flows into the hydrolysis and acidification tank 5, and then flows into the membrane bioreactor 6 (MBR), and the membrane bioreactor Reactor 6 treated water flows into second side zone 42 .

The hydrolysis and acidification tank 5 uses biological fillers as biological carriers, the dissolved oxygen is controlled below 0.5mg/L, and the water retention time is 12-150h.

The membrane bioreactor 6 is strengthened with modified activated carbon, and the aeration plate is used in the membrane bioreactor 6 for oxygen-enhancing aeration, and the packing is suspended inside. The residence time is 18-90h. The membrane bioreactor 6 uses a self-priming pump to suck the effluent water, and the water is filtered through the membrane system of the membrane bioreactor 6 and enters the second side area 42 of the forward osmosis device 4 .

In a preferred embodiment, before the high-salt wastewater is introduced into the forward osmosis device 4, it also includes the steps of performing pretreatment, electrocatalysis and membrane filtration in sequence; after pretreatment such as flocculation sedimentation or air flotation, suspended solids and grease are removed, and then enter the electrocatalysis. degrade. In electrocatalysis, the toxic organic matter in the wastewater will be degraded into small molecules to remove the toxicity, and then the tiny particles will be removed by membrane filtration. In this embodiment, the pretreatment device 1 is used for pretreatment, the electrocatalysis device 2 is used for electrocatalysis, and the membrane filtration device 3 is used for membrane filtration.

In a preferred embodiment, the up-to-standard water discharged from the second side region 42 can be discharged after removing the COD again.

The high-salt organic wastewater treatment system and method provided in this embodiment is suitable for the treatment of high-salt wastewater, and can be used for the treatment of high-salt wastewater generated in the fields of medicine, pesticide, and fine chemical industry.

In order to have a further understanding and understanding of the technical solutions of the present invention, several preferred embodiments are listed for further detailed description.

Example 1

A foreign-funded pharmaceutical company in Guangzhou mainly produces L-carnitine and other products, producing high-salt wastewater with a salt concentration of up to 12% and a COD of 20,000-30,000 mg/L, with an output of 2-3 m ³ /d. Adopt the technological process of accompanying drawing 3 to process. The raw water 100 is pretreated by electrocatalysis 200, the residence time is 2h, and the COD removal rate is about 10%. After 300 immersion ultrafiltration membrane filtration, the effluent of membrane filtration 300 enters the forward osmosis system 400, and the forward osmosis system 400 adopts the secondary Countercurrent form. After passing through the forward osmosis system 400, the effluent salt concentration of the first side region 401 is 1.8%. The effluent from the first side area 401 and the low ^- salt domestic sewage are mixed into the hydrolysis and acidification tank 600 . Hydrolysis and acidification tank 600 has a design residence time of 36h, and adopts hanging curtain packing. The effluent from the hydrolysis and acidification tank 600 enters the aerobic MBR system 700. The front-end aerobic use adopts contact oxidation + activated sludge, the contact oxidation residence time is 40h, and the activated sludge membrane tank residence time is 8h, totaling 48h. The reflux ratio of 700 to the front end of the anaerobic tank is 100-150%. The effluent of the MBR system 700 is concentrated through the forward osmosis system 400, and the effluent of the second side area 402 of the forward osmosis is directly discharged. Before the system is commissioned and started, tap water is added to the hydrolysis acidification tank and the MBR tank to adjust. After the installation and commissioning of the system is completed, the water quality of the incoming and outgoing water is shown in Table 1.

Table 1

It meets the third-level discharge standard in the second period of the Guangdong Province "Water Pollutant Discharge Limits" (DB4426-2001) discharge standard, and the treated wastewater is discharged to the outside.

Example 2

Small-scale equipment is produced in the laboratory, referring to Figure 2, including pretreatment device 1, electrocatalytic device 2, membrane filtration device 3, forward osmosis device 4, hydrolysis acidification tank 5, membrane bioreactor 6, membrane bioreactor 6 includes good Oxygen contact oxidation tank and aerobic MBR tank, the hydrolysis acidification tank volume is 80L, the aerobic contact oxidation tank is 30L, and the aerobic MBR tank is 25L. The peristaltic pump was used as the feed pump. During the test, the dissolved oxygen concentration in the hydrolysis and acidification tank was controlled below 0.5 mg/L, and the dissolved oxygen concentration in the aerobic tank was controlled at 3-5 mg/L. 2% of the dissolved oxygen in the aerobic tank was added during the culture of the aerobic tank. Powdered activated carbon to improve the removal effect of aerobic pools. High-salt wastewater from a pharmaceutical intermediate enterprise in Jiangsu, with a salt concentration of about 8%, is a mixed salt of sodium chloride and sodium sulfate, with a COD of about 15000-23000mg/L, which is pretreated by electrocatalytic oxidation, and then subjected to ultrafiltration membrane after pretreatment. Filtration, ultrafiltration effluent water is exchanged with membrane bioreactor effluent in the forward osmosis device. The effluent from the first side area of the forward osmosis device enters the two-stage hydrolysis and acidification tank, and simultaneously enters the domestic sewage (low-salt wastewater) into the hydrolysis and acidification tank. Observe the water quality changes after stable operation. The specific data are shown in Table 2.

Table 2

The hydrolysis and acidification residence time is 120h, and the aerobic residence time is 82.5h. The removal rate of COD in raw water is more than 99%, and the removal effect is good. The effluent of the second side area of the forward osmosis device can be further reduced by ozone oxidation to reduce COD.

Example 3

Using the equipment and raw water in Example 2, the treated water volume of the raw water is increased to 5L/d, and other conditions are kept unchanged, and the domestic sewage inflow is still 1L/d. Then, the residence time of the hydrolysis and acidification tank is 76.8h, and the aerobic residence time is 52.8h, and the culture test is carried out. After the system is stable, the effluent is shown in Table 3.

table 3

index COD(mg/L) Salt concentration (mg/L) Water volume (L/d) raw water 15000-23000 80000 5 Electrocatalytic water effluent 13000-20200 80000 5 Water outlet from the first side area 2700-4200 16700-17100 twenty four domestic sewage 150-180 200-220 1 Hydrolyzed acidified effluent 1220-1850 16000-16400 25 MBR outlet 50-73 16000-16400 25 Water outlet from the second side area 200-253 about 67000 6

The removal rate of COD in wastewater was 98.5%, and the removal effect was good. Compared with Example 2, the biochemical residence time is reduced and the removal rate is reduced to some extent after the water inflow is increased, but the removal rate is still very ideal.

The above are only the preferred embodiments of the present invention, and are not intended to limit the scope of the patent of the present invention. Any equivalent structure or equivalent process transformation made by using the contents of the description of the present invention, or directly or indirectly applied in other related technical fields, are the same as The principles are included in the scope of patent protection of the present invention.

Claims (6)

1. A high-salt organic wastewater treatment system is characterized by comprising a high-salt wastewater inlet, a low-salt wastewater inlet, a standard water discharge port, a forward osmosis device and an organic matter treatment device, wherein the forward osmosis device is divided into a first side region and a second side region, the first side region and the second side region are independent of each other and can only transfer mass through the forward osmosis membrane, the high-salt wastewater inlet is communicated with the first side region, a first side region water outlet is communicated with the organic matter treatment device, the low-salt wastewater inlet is communicated with the organic matter treatment device, a water outlet of the organic matter treatment device is communicated with the second side region, and a water outlet of the second side region is communicated with the standard water discharge port; the salt concentration in the first side region is always greater than the salt concentration in the second side region;

the salt concentration of the high-salt wastewater is more than 6%, the salt concentration of the low-salt wastewater is less than 2%, and the water inflow of the low-salt wastewater is not less than 10% of that of the high-salt wastewater;

the organic matter treatment device comprises a hydrolysis acidification tank and a membrane bioreactor, wherein a low-salt wastewater inlet is communicated with the hydrolysis acidification tank, a water outlet of the hydrolysis acidification tank is communicated with the membrane bioreactor, and a water outlet of the membrane bioreactor is communicated with the second side area; and the reflux port of the membrane bioreactor is communicated with the hydrolysis acidification tank.

2. The high-salinity organic wastewater treatment system according to claim 1, further comprising a pretreatment device, an electro-catalytic device and a membrane filtration device, wherein the high-salinity wastewater inlet, the pretreatment device, the electro-catalytic device, the membrane filtration device and the first side region are sequentially communicated along the water flow direction, and the membrane filtration device comprises one or more of column type ultrafiltration, column type microfiltration, submerged type ultrafiltration and submerged type microfiltration.

3. The high salt organic wastewater treatment system of claim 1 wherein the salt concentration of the water exiting the first side zone outlet is less than the salt concentration of the wastewater exiting the high salt wastewater inlet and the salt concentration of the water exiting the first side zone outlet is less than 3%.

4. The high-salt organic wastewater treatment system of claim 1, wherein the hydrolysis acidification tank is provided with biological filler, and the membrane bioreactor is provided with activated carbon.

5. The method for treating the high-salinity organic wastewater is characterized by comprising the following steps of:

firstly, introducing the low-salt wastewater into an organic matter treatment device, introducing the water treated by the organic matter treatment device into a second side area of a forward osmosis device,

introducing high-salinity wastewater into a first side region of a forward osmosis device, wherein the first side region and a second side region are independent of each other and can only transfer mass through the forward osmosis membrane, and the salt concentration in the first side region is always larger than that in the second side region; the salt concentration of the high-salt wastewater is more than 6%, the salt concentration of the low-salt wastewater is less than 2%, and the water inflow of the low-salt wastewater is not less than 10% of that of the high-salt wastewater;

the water in the second side area flows to the first side through the forward osmosis membrane, the high-salinity wastewater in the first side is diluted, the diluted wastewater firstly flows into the hydrolysis acidification tank to be mixed with the introduced low-salinity wastewater and then flows into the membrane bioreactor, the water treated by the membrane bioreactor flows into the second side area, the backflow port of the membrane bioreactor is communicated with the hydrolysis acidification tank to realize circulation treatment, and the water in the second side area is discharged through the water outlet.

6. The method for treating high-salinity organic wastewater according to claim 5, characterized in that the method further comprises the steps of pretreatment, electrocatalysis and membrane filtration in sequence before the high-salinity wastewater is introduced into the forward osmosis device;

the dissolved oxygen of the hydrolysis acidification tank is controlled below 0.5mg/L, the water retention time is 12-150h, the dissolved oxygen of the membrane bioreactor is controlled to be 2-5mg/L, and the water retention time is 18-90 h.

Images