High-salinity wastewater recovery treatment device

Abstract

The utility model discloses a high-salinity wastewater recovery treatment device. The device comprises a water storage tank, a water supply pump I, a sand filter, an FA pretreatment device, an FA water outlet tank, an FA water outlet pump, a security filter, a first-stage concentrated water reverse osmosis device, a first-stage concentrated water tank, a water supply pump II, a second-stage concentrated water ultrafiltration device, a second-stage concentrated water reverse osmosis device, a third-stage concentrated water ultrafiltration device, a third-stage concentrated water reverse osmosis device, a third-stage concentrated water tank and an MVR evaporation treatment device which are connected in sequence. According to the device disclosed by the utility model, the hardness and turbidity of the high-salinity wastewater in chemical production are effectively reduced by combining three-stage ultrafiltration and reverse osmosis, suspended solids, colloids, macromolecular substances, bacteria, BOD (Biochemical Oxygen Demand), COD (Chemical Oxygen Demand) and other impurities in the high-salinity wastewater are removed, the separated water and salt are recycled, and the device is simple in configuration, high in automation degree and convenient to operate.

Description

TECHNICAL FIELD

[0001] The utility model belongs to chemical water treatment technical field, concretely relates to a kind of high-salinity wastewater recovery processing device. BACKGROUND

[0002] There are a large amount of high-salinity wastewater in chemical industry field, which is usually directly sent to sewage treatment section, causing waste of water resources. The existing high-salinity wastewater treatment system has the disadvantages of low desalination efficiency, low automation degree, high energy consumption and large equipment footprint.

[0003] Chinese patent CN 204211580 U discloses a desalted water treatment device, which comprises, in sequence through pipeline connection, a raw water tank, an ultrafiltration security filter, an ultrafiltration device, an ultrafiltration pool, a first-stage security filter, a first-stage reverse osmosis device, a first-stage reverse osmosis water tank, a second-stage security filter, a second-stage reverse osmosis device and a second-stage reverse osmosis water tank. The second-stage reverse osmosis water tank is connected with an electrodialysis ion exchange device through a pipeline, and the electrodialysis ion exchange device is connected with a desalted water tank through a pipeline. The utility model solves the problem of regeneration acid and alkali discharge in ion exchange in the existing desalted water treatment, improves the recycling of water resources, and reduces the environmental pollution caused by wastewater discharge. However, the degree of automation is low, and the labor cost is high.

[0004] Chinese patent CN 212640201 U discloses a novel desalted water treatment system, which comprises a raw water pool connected to a desalted water tank through a raw water lifting pump, a multi-media filter, an activated carbon filter, an ultrafiltration water pool, a first-stage RO lifting pump, a first-stage reverse osmosis system, an inter-stage water tank, a second-stage reverse osmosis system, a fresh water tank and an EDI booster pump. A first pipeline mixer is connected between the raw water lifting pump and the multi-media filter, and the inner cavity of the first pipeline mixer is in communication with a bactericide dosing device and a non-oxidizing bactericide dosing device. A second pipeline mixer is connected between the first-stage RO lifting pump and the first-stage reverse osmosis system, and the inner cavity of the second pipeline mixer is connected with a reducing agent dosing device and a scale inhibitor dosing device. The utility model further removes salt through an EDI device after filtration by the multi-media filter and the activated carbon filter, which can reduce the conductivity of desalted water to below 0.2 μS / cm. The main purpose of the utility model is to reduce the conductivity of desalted water, but it cannot remove all COD, BOD and other soluble solids. In addition, the activated carbon needs to be replaced regularly, which increases the production cost.

[0005] The utility model discloses a desalted water treatment device, including the pretreatment system, membrane separation system and post -treatment system that connect gradually, the pretreatment system includes the raw water tank, primary filtration assembly and precision filtration assembly that set up gradually, the membrane separation system includes the primary reverse osmosis component, primary water tank, secondary reverse osmosis component and secondary water tank that set up gradually, the post -treatment system includes the EDI processing component, pure water tank, ultraviolet sterilizer and ultrafiltration membrane component that set up gradually, above -mentioned equipment all are connected through the pipeline. SUMMARY

[0006] In order to effectively solve the existing problems, it is necessary to invent a high-salinity wastewater recycling device.

[0007] The utility model discloses a high-salinity wastewater recycling device, including water storage pool, sand filter, FA pretreatment device, FA effluent pool, security filter, primary concentrated water reverse osmosis, primary concentrated water tank, secondary concentrated water ultrafiltration device, secondary concentrated water reverse osmosis, tertiary concentrated water ultrafiltration device, tertiary concentrated water reverse osmosis, tertiary concentrated water tank and MVR evaporation treatment device connected in turn.

[0008] Further, a water supply pump I is arranged on the pipeline between the water storage pool and the sand filter.

[0009] Further, an FA effluent pump is arranged on the pipeline between the FA effluent pool and the security filter.

[0010] Further, a water supply pump II is arranged on the pipeline between the primary concentrated water tank and the secondary concentrated water ultrafiltration device.

[0011] Further, the primary concentrated water reverse osmosis, the secondary concentrated water reverse osmosis and the tertiary concentrated water reverse osmosis are respectively provided with two outlets, one of which is a water production outlet, and the other is a concentrated water outlet, and the water production outlets are connected with the circulating water make-up pipe network through pipelines.

[0012] Further, a cleaning system is arranged on the pipeline connecting the water supply pump II outlet and the tertiary concentrated water reverse osmosis water production outlet.

[0013] Further, the cleaning system includes a forward washing valve, a concentrated water discharge valve, a water production valve, a backwashing water tank inlet valve, a backwashing water tank, a backwashing pump, an alkali dosing device, an acid dosing device, a sodium hypochlorite dosing device and a backwashing valve.

[0014] The utility model discloses a three-stage reverse osmosis device for treating high-salinity wastewater, which comprises a water storage tank, a water supply pump I, a sand filter, an FA pretreatment device, an FA water tank, an FA water pump, a security filter, a first-stage concentrated water reverse osmosis device, a first-stage concentrated water tank, a water supply pump II, a second-stage concentrated water ultrafiltration device, a second-stage concentrated water reverse osmosis device, a third-stage concentrated water ultrafiltration device, a third-stage concentrated water reverse osmosis device, a third-stage concentrated water tank, an MVR evaporation treatment device, a cleaning system, a forward washing valve, a concentrated water discharge valve, a water production valve, a backwashing water tank inlet valve, a backwashing water tank, a backwashing pump, an alkali feeding device, an acid feeding device, a sodium hypochlorite feeding device and a backwashing valve. BRIEF DESCRIPTION OF DRAWINGS

[0015] The accompanying drawings are included to provide a further understanding of the utility model, and constitute a part of the specification, and are used to explain the utility model together with embodiments of the utility model, and do not constitute the limitation to the utility model.

[0016] Fig. 1 It is the process flow diagram of the utility model.

[0017] Fig. 2 It is the cleaning system schematic view of the utility model.

[0018] Figs. 1-2 In the figure, 1 is a water storage tank, 2 is a water supply pump I, 3 is a sand filter, 4 is an FA pretreatment device, 5 is an FA water tank, 6 is an FA water pump, 7 is a security filter, 8 is a first-stage concentrated water reverse osmosis device, 9 is a first-stage concentrated water tank, 10 is a water supply pump II, 11 is a second-stage concentrated water ultrafiltration device, 12 is a second-stage concentrated water reverse osmosis device, 13 is a third-stage concentrated water ultrafiltration device, 14 is a third-stage concentrated water reverse osmosis device, 15 is a third-stage concentrated water tank, 16 is an MVR evaporation treatment device, 17 is a cleaning system, 17.1 is a forward washing valve, 17.2 is a concentrated water discharge valve, 17.3 is a water production valve, 17.4 is a backwashing water tank inlet valve, 17.5 is a backwashing water tank, 17.6 is a backwashing pump, 17.7 is an alkali feeding device, 17.8 is an acid feeding device, 17.9 is a sodium hypochlorite feeding device and 17.10 is a backwashing valve. DETAILED DESCRIPTION

[0019] Refer to the drawings Figs. 1-2The utility model embodiment provides a kind of high-salinity wastewater recovery processing device, the device includes water storage pool, sand filter, FA pretreatment device, FA effluent pool, security filter, primary concentrated water reverse osmosis, primary concentrated water tank, secondary concentrated water ultrafiltration device, secondary concentrated water reverse osmosis, tertiary concentrated water ultrafiltration device, tertiary concentrated water reverse osmosis, tertiary concentrated water tank, MVR evaporation processing device connected in sequence.

[0020] Another embodiment is different, water pump I is provided on the pipeline between the water storage pool and the sand filter, and high-salinity wastewater in the water storage pool is sent to the sand filter to filter suspended solids in the water.

[0021] Another embodiment is different, FA effluent pump is provided on the pipeline between the FA effluent pool and the security filter, and wastewater stored in the FA effluent pool after hardness and turbidity are reduced in the FA pretreatment device is sent to the security filter. The FA pretreatment device mainly includes reaction, coagulation, flocculation, sedimentation and filtration processes. Sodium hydroxide solution is added to high-salinity wastewater entering the FA pretreatment device to control pH at 11-12, and then sodium carbonate solution is added. Calcium carbonate and magnesium carbonate generated by the reaction are stirred by water flow and then coagulant is added. A mixing pool is provided in the FA pretreatment device, and the coagulant is quickly mixed with high-salinity wastewater by baffling and stirring in the mixing pool. An efficient sedimentation pool is also provided in the FA pretreatment device, which is divided into flocculation and sedimentation parts. Flocculant is added in the flocculation part to re-form larger flocculation bodies that are easy to settle. The sedimentation part is divided into a pre-sedimentation zone and an inclined pipe sedimentation zone by a partition. In the pre-sedimentation zone, flocculation bodies that are easy to settle quickly settle, and small flocculation bodies that have not settled or are not easy to settle are captured by the inclined pipe. Wastewater after hardness and turbidity are reduced enters the FA effluent pool for storage, and settled sludge enters a wastewater treatment system.

[0022] Another embodiment is different, water pump II is provided on the pipeline between the primary concentrated water tank and the secondary concentrated water ultrafiltration device.

[0023] Another embodiment is different, the primary concentrated water reverse osmosis, the secondary concentrated water reverse osmosis and the tertiary concentrated water reverse osmosis are respectively provided with two outlets. One outlet is a water production outlet, and the other outlet is a concentrated water outlet. The water production outlets are connected to a circulating water makeup pipe network through pipelines.

[0024] Fresh water separated by the tertiary concentrated water reverse osmosis is sent to the circulating water makeup pipe network from the water production outlet, and concentrated water enters the tertiary concentrated water tank after buffering through the concentrated water outlet and then enters the MVR evaporation processing device. The concentrated water is evaporated to form crystalline salt in the MVR evaporation processing device under continuous high temperature.

[0025] With the increase of the device running time, trace amounts of insoluble salt, microorganism, organic and inorganic impurity particles entering the secondary thick water ultrafiltration device, the secondary thick water reverse osmosis, the third thick water ultrafiltration device, the third thick water reverse osmosis, the membrane surface is blocked, therefore, the utility model discloses a cleaning system is arranged on the pipeline that the water supply pump II export is connected with the third thick water reverse osmosis water production export.

[0026] Another embodiment is different, the cleaning system includes positive washing valve, thick water discharge valve, water production valve, backwash water tank inlet valve, backwash water tank, backwash pump, alkali adding device, acid adding device, sodium hypochlorite adding device, backwash valve.

[0027] Another embodiment is different, the alkali adding device adds sodium hydroxide solution or potassium hydroxide solution in the cleaning system, the concentration is 0.1-0.3% (wt), and the main purpose is to prevent the growth of bacteria and the rapid accumulation of pollutants.

[0028] Another embodiment is different, the acid adding device adds hydrochloric acid solution or sulfuric acid solution in the cleaning system, the concentration is 0.2-0.5% (wt), and the main purpose is to prevent the growth of bacteria and the rapid accumulation of pollutants.

[0029] Another embodiment is different, the sodium hypochlorite adding device adds sodium hypochlorite solution in the cleaning system, and the effective chlorine concentration is 100-200ppm, and the main purpose is sterilization.

[0030] The operation process of the cleaning system includes three modes of positive washing, backwashing and chemical enhanced backwashing. When positive washing, the positive washing valve and the thick water discharge valve are opened, the water production valve and the backwash water tank inlet valve are closed, the thick water from the water supply pump II is used to flush the membrane pollution deposits by generating tangential acceleration on the membrane surface, to increase the effect of backwashing, so that the ultrafiltration device and the reverse osmosis device completely recover the permeation. When backwashing, the water flow direction is opposite to the water production direction, the positive washing valve, the thick water discharge valve and the water production valve are closed, the backwash water tank inlet valve and the backwash valve are opened, the water production of the third thick water reverse osmosis water outlet is used as backwash water to avoid the pollution of the membrane on the water production side and the blockage of the membrane holes by impurities. When chemical enhanced backwashing, the water flow direction is the same as the backwashing direction, and the chemical enhanced backwashing is divided into three modes of chemical enhanced alkali washing, chemical enhanced acid washing and chemical enhanced sterilization. The time, frequency and mode of chemical enhanced backwashing are determined according to the pollution condition. The chemical enhanced alkali washing and the chemical enhanced acid washing are generally not carried out separately in one chemical enhanced backwashing process, but according to the water quality of the backwash water discharged, the chemical enhanced alkali washing is carried out first and then the chemical enhanced acid washing is carried out, or the chemical enhanced acid washing is carried out first and then the chemical enhanced alkali washing is carried out, or only the chemical enhanced alkali washing is carried out, or only the chemical enhanced acid washing is carried out. The chemical enhanced sterilization process can be carried out at any time according to production needs.

[0031] Another embodiment is different in that the COD content of the high-salt wastewater entering the water storage tank is less than 120 mg / L, the ammonia nitrogen content is less than 20 mg / L, the turbidity is less than 10 NTU, and the pH is 6-9.

[0032] Another embodiment is different in that the COD content of the water from the three-stage concentrated water reverse osmosis water outlet to the circulating water makeup pipe network is less than 50 mg / L, the ammonia nitrogen content is less than 5 mg / L, the turbidity is less than 5 NTU, and the pH is 6-9.

[0033] The above only describes the preferred embodiments of the present application, and is not intended to limit the present application, and any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A high-salinity wastewater recovery treatment device, characterized by: The device comprises a water storage tank, a sand filter, an FA pretreatment device, an FA effluent tank, a security filter, a primary concentrated water reverse osmosis, a primary concentrated water tank, a secondary concentrated water ultrafiltration device, a secondary concentrated water reverse osmosis, a tertiary concentrated water ultrafiltration device, a tertiary concentrated water reverse osmosis, a tertiary concentrated water tank and an MVR evaporation treatment device connected in sequence.

2. The high-salinity wastewater recovery treatment device according to claim 1, characterized in that: A water supply pump I is arranged on the pipeline between the water storage tank and the sand filter.

3. The device for recovering and treating high-salinity wastewater according to claim 1, characterized in that: An FA effluent pump is arranged on the pipeline between the FA effluent tank and the security filter.

4. The device for recovering and treating high-salinity wastewater according to claim 1, characterized in that: A water supply pump II is arranged on the pipeline between the primary concentrated water tank and the secondary concentrated water ultrafiltration device.

5. The device for recovering and treating high-salinity wastewater according to claim 1, characterized in that: The primary concentrated water reverse osmosis, the secondary concentrated water reverse osmosis and the tertiary concentrated water reverse osmosis are respectively provided with two outlets, one of which is a water production outlet, and the other of which is a concentrated water outlet, and the water production outlets are connected with a circulating water makeup pipeline network through pipelines.

6. The high-salinity wastewater recovery treatment device of claim 5, wherein: A cleaning system is arranged on the pipeline connecting the water supply pump II outlet and the tertiary concentrated water reverse osmosis water production outlet.

7. The high-salinity wastewater recovery treatment device of claim 6, wherein: The cleaning system comprises a forward washing valve, a concentrated water discharge valve, a water production valve, a backwashing water tank inlet valve, a backwashing water tank, a backwashing pump, an alkali dosing device, an acid dosing device, a sodium hypochlorite dosing device and a backwashing valve.

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