CN109987739A - A kind of container-type seawater desalination system - Google Patents

Abstract

The invention discloses a container-type seawater desalination system, which comprises a first container and a second container, the first container is provided with a pretreatment system and a reverse osmosis system, the second container is provided with a forward osmosis system, and the reverse osmosis system includes Reverse osmosis booster pump, reverse osmosis security filter, high pressure pump, energy recovery device and reverse osmosis membrane group, forward osmosis system includes forward osmosis feed pump, forward osmosis security filter, forward osmosis membrane group and draw liquid water tank. The reverse osmosis technology and the forward osmosis technology are integrated in the present invention, the quality of the produced water is high, the operating pressure is relatively low, and the degree of membrane pollution is low; the integrated energy recovery device and the large-flow filter element horizontal FRP filter have high energy efficiency and compact structure; It adopts sub-system layout, multi-group design, high-pressure pump and energy recovery device adopts frequency conversion control, flexible operation mode, large operation flexibility, strong adaptability, and good economic value and environmental protection value.

Description

A containerized seawater desalination system

technical field

The invention relates to the technical field of water resources treatment, in particular to a containerized seawater desalination system.

Background technique

Today, with the increasing shortage of freshwater resources, seawater desalination, an open source incremental technology for water resources, has become an important way for countries around the world to solve the problem of water shortages. Coastal water-deficient cities and islands are actively promoting the construction of seawater desalination projects. The construction process of large and medium-sized seawater desalination systems is relatively complex, the construction period is long, and the investment is large, so it is suitable for areas with concentrated and large water consumption. The container-type desalination system has the advantages of compact structure, small floor space, less civil work, short construction period, and quick layout. It is especially suitable for areas with poor construction conditions, scattered water or less water consumption. It has been rapidly developed and widely used in recent years.

The desalination process of the containerized seawater desalination system is mainly based on the reverse osmosis technology. The utility model patent CN201161955Y discloses a mobile seawater desalination device, which uses a standard container to arrange the pretreatment, ultrafiltration, reverse osmosis devices, pump sets, etc. together. The utility model patent CN203212394U uses a multi-media filter, an active filter, etc. as pretreatment, increases the volume of the water tank, and integrates the seawater desalination equipment, the water tank and the ultraviolet disinfection into the container. The utility model patent CN203402982 uses a mechanically accelerated clarifier as a pretreatment device to replace the mechanical filter and ultrafiltration, and is connected with a multi-media filter and a reverse osmosis device to achieve desalination, and is also provided with a mineralization device and a turbine-type energy recovery device. The utility model patent CN203794715U uses a multi-media filter, an active filter, etc. as pretreatment, and a softening device is installed after the water is discharged from the membrane shell, so as to adapt to the harsh industrial water supply. The integrated container seawater desalination equipment published by the invention patent CN104803516B adopts ultrafiltration and reverse osmosis processes. A bubble detection window is set above the ultrafiltration membrane tube to determine whether the ultrafiltration membrane group needs to be cleaned and replaced. The reverse osmosis membrane group adopts two stages , set up an energy recovery device to provide more efficient water production. Invention patent application CN105152399A discloses a reverse osmosis seawater desalination device and its water production process, which adopts sand filter and reverse osmosis process. To save space, protect the membrane components. The utility model patent CN206232514U discloses a containerized seawater desalination device, which adopts a multi-media filtration system and a reverse osmosis process.

Different technologies are improved or optimized in pretreatment such as sand filter, activated carbon filter, mechanical stirring clarification, ultrafiltration, etc. or reverse osmosis technology, but their main technical core has not been changed. Reverse osmosis technology has made great progress in recent decades. It is the mainstream technology of seawater desalination technology. It has accounted for more than 70% of the total production capacity of desalination plants in the world. It is also the main technology of container seawater desalination plants. However, in the past ten years, forward osmosis technology has been in the ascendant. The process does not require external pressure or very low external pressure, and the membrane fouling is relatively light. The published forward osmosis seawater desalination technology adopts the combination of forward osmosis and magnetic separation technology, with reverse osmosis and nanofiltration technology, with thermal separation technology, membrane distillation and other technologies. The seawater desalination process combining forward osmosis and reverse osmosis has been applied in engineering, but the cases are very limited. Seawater is used as the influent and salt solution is used as the extraction liquid, and reverse osmosis is used to realize the regeneration of the extraction liquid. The influent water source is single and the operation flexibility is small. , high energy consumption. As a new type of seawater desalination process, forward osmosis, how to achieve integrated layout and simple and convenient operation is the key to its popularization and application.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a containerized seawater desalination system with good water quality, compact structure, low membrane pollution degree and low production cost, so that the existing technology in the prior art has a high degree of membrane pollution, poor product water quality and low production cost. High problem is solved.

In order to achieve the above purpose, the present invention provides the following solutions: the present invention provides a containerized seawater desalination system, including a first container and a second container, wherein a pretreatment system and a reverse osmosis system are arranged in the first container, and the A forward osmosis system is arranged in the second container, and the reverse osmosis system includes a reverse osmosis booster pump, a reverse osmosis security filter, a high-pressure pump, an energy recovery device and a reverse osmosis membrane group, and the forward osmosis system includes a forward osmosis feed pump , a forward osmosis security filter, a forward osmosis membrane group and a water tank for drawing liquid, the pretreatment system is used to remove impurities in the raw water, the water outlet of the pretreatment system is connected with the forward osmosis water inlet pump, and the positive The osmosis feed pump is respectively connected with the forward osmosis security filter and the reverse osmosis security filter through a control valve, and the forward osmosis security filter is connected with the raw water inlet of the forward osmosis membrane group, and the positive osmosis security filter is connected with the raw water inlet of the forward osmosis membrane group. The suction liquid inlet of the osmotic membrane group is connected with the low-pressure concentrated water outlet of the energy recovery device, the suction liquid outlet of the forward osmosis membrane group is connected with the suction liquid water tank, and the suction liquid water tank is connected with the reverse osmosis. The inlet of the booster pump is connected, the outlet of the reverse osmosis booster pump is connected with the inlet of the reverse osmosis security filter, and the outlet of the reverse osmosis security filter is respectively connected with the low pressure water inlet of the energy recovery device It is connected with the inlet of the high-pressure pump, the outlet of the high-pressure pump is connected with the water inlet of the reverse osmosis membrane group, and the high-pressure concentrated water inlet of the energy recovery device is connected with the concentrated water outlet of the reverse osmosis membrane group. The high-pressure water outlet of the energy recovery device is connected with the pipeline between the high-pressure pump and the reverse osmosis membrane group, and the water outlet of the reverse osmosis membrane group is connected with a water production tank.

Preferably, the pretreatment system includes a raw water tank, a raw water pump, a self-cleaning filter, an ultrafiltration device and an intermediate water tank connected in sequence, and the water outlet of the intermediate water tank is connected to the forward osmosis inlet water pump.

Preferably, a flocculant dosing device and a flocculant dosing device are arranged on the pipeline between the raw water pump and the self-cleaning filter.

Preferably, the pretreatment system further includes a backwashing dosing device, the backwashing dosing device includes a backwashing pump and a dosing device connected in sequence, and the water inlet of the backwashing pump is connected to the water inlet of the intermediate water tank. The water outlet is connected with the water outlet, and the water outlet of the backwash pump is also connected with the pipeline between the ultrafiltration device and the intermediate water tank.

Preferably, the ultrafiltration device is connected with an air compressor.

Preferably, a cleaning system is provided in the containerized seawater desalination system, and the cleaning system includes a cleaning water tank, a cleaning water pump and a cleaning security filter connected in sequence, and the water outlet of the cleaning security filter is connected to the ultrafiltration device. , the forward osmosis membrane group and/or the reverse osmosis membrane group are connected.

Preferably, the raw water stored in the raw water tank is seawater or rainwater; when the raw water is rainwater, the control valve is communicated with the forward osmosis security filter; when the raw water is seawater, the control valve The valve is communicated with the reverse osmosis security filter, or the control valve is communicated with the forward osmosis security filter and the reverse osmosis security filter respectively; preferably, the control valve is an electric three-way valve.

Preferably, a reducing agent dosing device and a scale inhibitor dosing device are provided on the pipeline between the control valve and the forward osmosis water inlet pump.

Preferably, a disinfection and dosing device is provided on the pipeline between the water outlet of the reverse osmosis membrane group and the water production tank.

Preferably, the drawing liquid stored in the drawing liquid water tank is sodium chloride, sodium sulfate, magnesium sulfate, potassium sulfide and/or sea water.

The present invention has achieved the following beneficial effects with respect to the prior art:

1. In the containerized seawater desalination system provided by the present invention, the reverse osmosis system and the forward osmosis system are respectively arranged in the first container and the second container, and the reverse osmosis system and the forward osmosis system are connected, so that the seawater desalination system integrates Reverse osmosis technology and forward osmosis technology, and have the advantages of container-type seawater desalination device and forward osmosis seawater desalination technology in the prior art, the raw water is filtered twice by forward osmosis and reverse osmosis, the quality of product water is high, and the operating pressure of forward osmosis process is low, Membrane fouling is also low.

2. The container-type seawater desalination system provided by the present invention adopts two containers for integrated arrangement, and each container can be used independently; rainwater can be used as the water source, and forward osmosis and reverse osmosis are used for seawater desalination; forward osmosis system and reverse osmosis can be used for seawater desalination; The system is divided into system layout, multi-group design, high-pressure pump and energy recovery device adopts frequency conversion control, which has large operation flexibility and strong adaptability, and can be operated with variable load according to actual application conditions; Reverse osmosis is used for desalination when there is little or no rain.

3. The container-type seawater desalination system provided by the present invention adopts an integrated energy recovery device, a plunger-type high-pressure pump and a large-flow filter element horizontal FRP security filter, which has a high degree of system integration, compact structure, convenient transportation, small volume, and construction Less, can be quickly arranged.

4. In the container-type seawater desalination system provided by the present invention, rainwater is used as the raw water source, which can realize the recycling of rainwater in water-deficient areas and rainwater areas, and greatly reduce the amount of seawater intake; High osmotic pressure, and derived from nature, low cost.

5. In the containerized seawater desalination system provided by the present invention, rainwater is used as the raw water source, and the pollutants discharged with the rainwater are reduced through pretreatment; the forward osmosis technology is adopted, the membrane pollution trend is low, and the required chemical reagents are compared with the traditional reverse osmosis. The dosage is small; the intake of sea water is reduced, and the salt content of the concentrated water is low, which reduces the ecological impact on the offshore marine environment.

Description of drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the accompanying drawings required in the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some of the present invention. In the embodiments, for those of ordinary skill in the art, other drawings can also be obtained according to these drawings without creative labor.

Fig. 1 is the overall structure schematic diagram of the container type seawater desalination system of the present invention;

Among them, 1-raw water pump; 2-self-cleaning filter; 3-ultrafiltration device; 4-air compressor; 5-intermediate water tank; 6-forward osmosis water pump; 7-backwash pump; 8-control valve; 9 -forward osmosis security filter; 10-forward osmosis membrane group; 11-drawing liquid water tank; 12-reverse osmosis booster pump; 13-reverse osmosis security filter; 14-energy recovery device; 15-high pressure pump; 16-reverse osmosis Permeable membrane group; 17-water production tank; 18-cleaning water tank; 19-cleaning water pump; 20-cleaning security filter; 21-flocculant dosing device; 22-coagulant dosing device; 23-backwash dosing device ; 24-reducing agent dosing device; 25-scaling inhibitor dosing device; 26-disinfection dosing device.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

The purpose of the present invention is to provide a containerized seawater desalination system with good water quality, compact structure, low membrane pollution degree and low production cost, so that the existing technology in the prior art has a high degree of membrane pollution, poor product water quality and low production cost. High problem is solved.

In order to make the above objects, features and advantages of the present invention more clearly understood, the present invention will be described in further detail below with reference to the accompanying drawings and specific embodiments.

As shown in Figure 1, the present invention provides a containerized seawater desalination system, including a first container and a second container, the first container is provided with a pretreatment system and a reverse osmosis system, and the second container is provided with a forward osmosis system, The reverse osmosis system includes a reverse osmosis booster pump 12, a reverse osmosis security filter 13, a high pressure pump 15, an energy recovery device 14 and a reverse osmosis membrane group 16, and the forward osmosis system includes a forward osmosis feed pump 6, a forward osmosis security filter 9, The forward osmosis membrane group 10 and the drawing liquid water tank 11, the pretreatment system is used to remove the impurities in the raw water, the water outlet of the pretreatment system is connected with the forward osmosis inlet water pump 6, and the forward osmosis inlet water pump 6 is connected to the positive osmosis inlet pump 6 through a control valve 8 respectively. The osmosis security filter 9 is connected with the reverse osmosis security filter 13, the forward osmosis security filter 9 is connected with the raw water inlet of the forward osmosis membrane group 10, and the suction liquid inlet of the forward osmosis membrane group 10 is connected with the low pressure concentration of the energy recovery device 14. The water outlet is connected, the extraction liquid outlet of the forward osmosis membrane group 10 is connected with the extraction liquid water tank 11, the extraction liquid water tank 11 is connected with the inlet of the reverse osmosis booster pump 12, and the outlet of the reverse osmosis booster pump 12 is connected with the reverse osmosis security guard. The inlet of the filter 13 is connected, the outlet of the reverse osmosis security filter 13 is respectively connected with the low pressure water inlet of the energy recovery device 14 and the inlet of the high pressure pump 15, and the outlet of the high pressure pump 15 is connected with the water inlet of the reverse osmosis membrane group 16. The high-pressure concentrated water inlet of the energy recovery device 14 is connected with the concentrated water outlet of the reverse osmosis membrane group 16, and the high-pressure water outlet of the energy recovery device 14 is connected with the pipeline between the high-pressure pump 15 and the reverse osmosis membrane group 16, A water production tank 7 is connected to the water outlet of the reverse osmosis membrane group 16 .

Wherein, when the seawater desalination is carried out, the raw water is filtered through the pretreatment system; the filtered raw water enters the inlet pump through the inlet of the forward osmosis inlet pump 6, and the outlet of the forward osmosis inlet pump 6 is connected with the control valve 8, that is, The inlet of the control valve 8 is connected with the outlet of the forward osmosis water inlet pump 6, and the control valve 8 is respectively connected with the inlet of the forward osmosis security filter 9 and the inlet of the reverse osmosis security filter 13;

The outlet of the forward osmosis security filter 9 is connected to the raw water inlet of the forward osmosis membrane group 10. The forward osmosis security filter 9 adopts a high-flow filter element horizontal FRP filter with a filtration accuracy of 5um. The horizontal FRP filter has a compact structure and occupies an area of Small area.

The raw water outlet of the forward osmosis membrane group 10 is connected with the discharge pipeline, and is discharged outside the membrane group; the suction liquid inlet is connected with the low-pressure concentrated water outlet of the energy recovery device 14, and the suction liquid outlet is connected with the suction liquid water tank 11 for realizing the forward osmosis process, Even if the water in the raw water side of the forward osmosis membrane group 10 (the raw water inlet and the raw water outlet are respectively arranged at both ends of the raw water side) enters the drawn liquid side under the action of the osmotic pressure of the drawn liquid (the drawn liquid inlet and the drawn liquid outlet are arranged at both ends of the liquid side).

The inlet of the reverse osmosis booster pump 12 is connected with the outlet of the liquid water tank 11, and the outlet of the reverse osmosis booster pump 12 is connected with the inlet of the reverse osmosis security filter 13; the outlet pipeline of the reverse osmosis security filter 13 is divided into two parts, One part is connected to the low pressure water inlet of the energy recovery device 14, and the other part is connected to the inlet of the high pressure pump 15; wherein, the reverse osmosis security filter 13 adopts a large flow filter element horizontal FRP filter with a filtration accuracy of 5um.

The low pressure water inlet of the energy recovery device 14 is connected to the reverse osmosis security filter 13, and the high pressure water outlet of the energy recovery device 14 is connected to the water outlet pipe of the high pressure pump 15 (ie the pipeline between the high pressure pump 15 and the reverse osmosis membrane group 16) , the high-pressure concentrated water inlet of the energy recovery device 14 is connected to the concentrated water outlet of the reverse osmosis device, and the low-pressure concentrated water outlet of the energy recovery device 14 is connected to the suction liquid inlet of the forward osmosis membrane group 10 . Among them, the energy recovery device 14 adopts a pressure exchanger and a booster integrated device, adopts frequency conversion control, has high energy recovery efficiency, does not require a pressure lift pump, can reduce the footprint and save space.

In the present invention, the pretreatment system includes a raw water tank, a raw water pump 1, a self-cleaning filter 2, an ultrafiltration device 3 and an intermediate water tank 5, and the water outlet of the intermediate water tank 5 is connected with the forward osmosis water inlet pump 6; The raw water flows into the raw water tank or the raw water enters the raw water tank through the water inlet, that is, the inlet of the raw water pump 1 is connected with the raw water tank or the water inlet; the inlet of the self-cleaning filter 2 is connected with the outlet of the raw water pump 1, and the outlet is connected with the inlet of the ultrafiltration device 3 The self-cleaning filter 2 is used to remove particulate matter, suspended solids and other substances in the raw water. The filtration accuracy is 100um, and the operation and cleaning are automatically performed according to the program settings; the outlet of the ultrafiltration device 3 is connected to the inlet of the intermediate water tank 5. Among them, the ultrafiltration device 3 adopts an external pressure type hollow fiber membrane module to remove colloids, some organic substances and other substances in the water; and the water production pipe is provided with a transparent pipe section for visual observation.

In the present invention, the pipeline between the raw water pump 1 and the self-cleaning filter 2 is provided with a flocculant dosing device 21 and a flocculant dosing device 22, wherein the flocculant dosing device 21 and the coagulant dosing device 22, Both are used for flocculation to strengthen the removal of colloids, suspended solids and other substances.

In the present invention, the pretreatment system also includes a backwashing dosing device 23 . The backwashing dosing device 23 includes a backwashing pump 7 and a dosing device that are connected in sequence. The water inlet of the backwashing pump 7 is in phase with the water outlet of the intermediate tank 5 connection, the water outlet of the backwash pump 7 is also connected with the pipeline between the ultrafiltration device 3 and the intermediate water tank 5; wherein, the backwash pump 7 is set for backwashing, and the inlet of the backwash pump 7 is connected with the intermediate water tank 5 , the outlet is connected to the outlet of the ultrafiltration device 3, and automatic backwashing and chemically enhanced backwashing are realized through electric valve switching and procedures.

In the present invention, the ultrafiltration device 3 is connected with an air compressor 4, wherein the air compressor 4 is used for air scrubbing.

In the present invention, the containerized seawater desalination system is provided with a cleaning system. The cleaning system includes a cleaning water tank 18, a cleaning water pump 19, and a cleaning security filter 20 connected in sequence. The water outlet of the cleaning security filter 20 and the ultrafiltration device 3, the forward osmosis The membrane stack 10 and/or the reverse osmosis membrane stack 16 are connected.

In the present invention, the raw water stored in the raw water tank is seawater or rainwater; when the raw water is rainwater, the control valve 8 is connected with the forward osmosis security filter 9; when the raw water is seawater, the control valve 8 is connected with the reverse osmosis security filter 13 Or the control valve 8 is communicated with the forward osmosis security filter 9 and the reverse osmosis security filter 13 respectively; That is, the forward osmosis system and the reverse osmosis system can not only cooperate with each other to carry out seawater desalination, but also can carry out reverse osmosis seawater desalination independently; Preferably Yes, the control valve 8 is an electric three-way valve; preferably, when the raw water is seawater, the control valve 8 is communicated with the reverse osmosis security filter 13 .

In the present invention, the pipeline between the control valve 8 and the forward osmosis water pump 6 is provided with a reducing agent dosing device 24 and a scale inhibitor dosing device 25 for adding the reducing agent and the scale inhibitor.

In the present invention, a sterilizing and dosing device 26 is provided on the pipeline between the water outlet of the reverse osmosis membrane group 16 and the water production tank 7 for adding the disinfectant.

In the present invention, the drawing liquid stored in the drawing liquid water tank 11 is sodium chloride, sodium sulfate, magnesium sulfate, potassium sulfide and/or sea water, and when the raw water is rainwater, preferably, the drawing liquid is sea water.

In the present invention, specific examples are used to illustrate the principles and implementations of the present invention, and the descriptions of the above embodiments are only used to help understand the method and the core idea of the present invention; There will be changes in the specific implementation manner and application scope of the idea of the invention. In conclusion, the contents of this specification should not be construed as limiting the present invention.

Claims (10)

1. a kind of container-type seawater desalination system, which is characterized in that including the first container and the second container, described first It is provided with pretreatment system and counter-infiltration system in container, positive osmosis system is provided in second container, it is described anti- Osmosis system includes reverse osmosis booster pump, reverse osmosis cartridge filter, high-pressure pump, energy recycle device and reverse osmosis membrane group, institute It states positive osmosis system to include positive infiltration intake pump, just permeating cartridge filter, forward osmosis membrane group and drawing liquid water tank, the pre- place Reason system is used to remove the impurity in raw water, and the water outlet of the pretreatment system is connected with the positive infiltration intake pump, institute State positive infiltration intake pump by a control valve respectively with the positive infiltration cartridge filter and the reverse osmosis cartridge filter phase Connection, the positive infiltration cartridge filter are connected with the raw water inlet of the forward osmosis membrane group, and the forward osmosis membrane group is drawn Liquid import is taken to be connected with the low-press thick water out of the energy recycle device, the forward osmosis membrane group draws liquid outlet and institute It states and draws liquid water tank and be connected, the liquid water tank that draws is connected with the entrance of the reverse osmosis booster pump, the reverse osmosis increasing The outlet of press pump is connected with the entrance of the reverse osmosis cartridge filter, the outlet of the reverse osmosis cartridge filter respectively with The low-pressure intake of the energy recycle device is connected with the entrance of the high-pressure pump, the outlet of the high-pressure pump and described anti- The water inlet of permeable membrane group is connected, and the high-pressure thick water inlet of the energy recycle device and the concentrated water of the reverse osmosis membrane group go out Mouth is connected, the pipeline phase between the high-pressure outlet of the energy recycle device and the high-pressure pump and the reverse osmosis membrane group Connection, the water outlet of the reverse osmosis membrane group are connected with a water producing tank.

2. container-type seawater desalination system according to claim 1, which is characterized in that the pretreatment system include according to Raw water water tank, raw water pump, self-cleaning filter, ultrafiltration apparatus and the intermediate water tank of secondary connection, the water outlet of the intermediate water tank It is connected with the positive infiltration intake pump.

3. container-type seawater desalination system according to claim 2, which is characterized in that the raw water pump is with described from clear It washes and is provided with flocculant chemicals dosing plant and flocculation aid chemicals dosing plant on the pipeline between filter.

4. container-type seawater desalination system according to claim 2, which is characterized in that the pretreatment system further includes One backwash chemicals dosing plant, the backwash medicating mechanism include sequentially connected backwashing pump and chemicals dosing plant, and the backwashing pump enters The mouth of a river is connected with the water outlet of the intermediate water tank, the water outlet of the backwashing pump also with the ultrafiltration apparatus and the centre Pipeline between water tank is connected.

5. container-type seawater desalination system according to claim 2, which is characterized in that the ultrafiltration apparatus is connected with one Air compressor machine.

6. container-type seawater desalination system according to claim 2, which is characterized in that the container-type sea water desalination A cleaning system is provided in system, the cleaning system includes sequentially connected cleaning water tank, flushing water pump and cleaning security personnel Filter, water outlet and the ultrafiltration apparatus of the cleaning cartridge filter, the forward osmosis membrane group and/or described reverse osmosis Film group is connected.

7. container-type seawater desalination system according to claim 2, which is characterized in that stored in the raw water water tank Raw water is seawater or rainwater；When the raw water is rainwater, the control valve is connected with the positive infiltration cartridge filter；When The raw water be seawater when, the control valve be connected with the reverse osmosis cartridge filter or the control valve respectively with institute Positive infiltration cartridge filter is stated to be connected with the reverse osmosis cartridge filter；Preferably, the control valve is electric T-shaped valve.

8. container-type seawater desalination system according to claim 1, which is characterized in that the control valve and the positive infiltration It penetrates on the pipeline between water pump and is provided with reducing agent chemicals dosing plant and antisludging agent chemicals dosing plant.

9. container-type seawater desalination system according to claim 1, which is characterized in that the water outlet of the reverse osmosis membrane group Disinfection chemicals dosing plant is provided on pipeline between mouth and the water producing tank.

10. container-type seawater desalination system according to claim 1, which is characterized in that described draw in liquid water tank is stored up The liquid that draws deposited is sodium chloride, sodium sulphate, magnesium sulfate, potassium sulfide and/or seawater.