CN212954675U

CN212954675U - Printing and dyeing wastewater reclaimed water reuse water treatment system

Info

Publication number: CN212954675U
Application number: CN202021106751.9U
Authority: CN
Inventors: 马强; 张文刚; 闻慧国
Original assignee: Hangzhou Kemu Water Treatment Engineering Co ltd
Current assignee: Hangzhou Kemu Water Treatment Engineering Co ltd
Priority date: 2020-06-15
Filing date: 2020-06-15
Publication date: 2021-04-13
Anticipated expiration: 2030-06-15

Abstract

The application discloses a treatment system for reclaimed water of printing and dyeing wastewater, which comprises a sand filtration assembly, an ultrafiltration water production tank, a reverse osmosis assembly and a back flush assembly; the water inlet of the sand filtration component is connected with biochemical effluent of printing and dyeing wastewater, the produced water outlet is connected with the water inlet of the ultrafiltration component, the produced water outlet of the ultrafiltration component is connected with the ultrafiltration produced water tank, the water inlet of the reverse osmosis component is connected with the ultrafiltration produced water tank, the fresh water outlet is connected with the reuse pipeline, and the concentrated water outlet is connected with the concentrated water drain pipe. The method has the advantages of low operating cost, low investment, high desalting rate, good effluent quality and the like, the reuse water rate is more than 50%, the treated effluent reaches the discharge standard of pollutants for textile dyeing and finishing industry, and the reuse water standard of 50% of local environmental protection requirements in certain regions is reached.

Description

Printing and dyeing wastewater reclaimed water reuse water treatment system

Technical Field

The application belongs to the technical field of sewage treatment, especially relates to a printing and dyeing wastewater reuse of reclaimed water processing system.

Background

The textile printing and dyeing industry is the traditional dominant industry which is the earliest developed industry in China and has international competitiveness, but is also the typical industry with high energy consumption and high water consumption. The energy consumption of the textile printing and dyeing industry accounts for about 4.4 percent of the total amount of the national industry, and the water consumption accounts for about 8.5 percent. The daily average discharge amount of the dyeing wastewater is as high as 300-400 ten thousand cubic meters. If the waste water is completely recycled, 20% of daily domestic water consumption of residents in China is saved.

The textile dyeing and finishing wastewater is mainly generated in two major links of dyeing and finishing pretreatment, dyeing and printing. The pollutants in the wastewater mainly come from fiber materials, textile sizing agents, dyes used in printing and dyeing processing, chemical agents, surfactants, printing and dyeing auxiliaries and various finishing agents. Generally has the characteristics of large water quantity, deep chromaticity, strong alkalinity, high concentration of organic pollutants, complex components and poor biochemical biodegradability. The current treatment method aiming at the printing and dyeing wastewater mainly adopts a hydrolysis-aerobic biological treatment technology as a main technology, and is the most mature, stable and economic technology at present for treating the printing and dyeing wastewater with a chemical treatment technology as an auxiliary technology. But the effluent of the process is basically directly discharged or partially recycled in a small amount, thereby causing water resource waste. In order to improve the reuse ratio of the water in the printing and dyeing wastewater, the effluent quality standard is improved and the wastewater discharge is reduced by a wastewater advanced treatment technology on the basis of physicochemical and biochemical pretreatment processes.

Application No.: 201911367305.5 discloses a recovery process of waste water discharged from printing and dyeing, which comprises a pretreatment part: grating, air flotation, hydrolytic acidification, anaerobic treatment, aerobic treatment and MBR (membrane bioreactor); a reduction part: a reverse osmosis membrane and a nanofiltration membrane; the advanced treatment part comprises three treatment units, namely a Fenton process, active carbon MBR and the like. Although the process can greatly improve the water quality, meet the requirement of reuse water and effectively reduce the discharge amount of wastewater of enterprises, the process has longer process flow line, large occupied area and higher equipment investment and operation cost. Further, patent No.: 201911261361.0 discloses an advanced treatment device for printing and dyeing wastewater pollutants and application thereof, wherein MBBR is used as a main place for organic matter removal and ammonia nitrogen degradation; the sulfur-iron autotrophic denitrification realizes the removal of nitrate nitrogen and phosphate, and the goal of nitrogen and phosphorus removal is completed; the activated carbon further adsorbs and removes residual organic matters, and the stable standard-reaching discharge of the effluent COD is realized. Although the combined process flow is short and the operation cost is low, the effluent quality has high salt content and cannot reach the standard of recycled water, the dyeing process has high requirement on the water quality, and the dyeing quality is influenced by using the effluent quality for dyeing.

Therefore, a deep treatment process for the printing and dyeing wastewater liquid, which has the advantages of short flow, high desalting rate, good effluent quality, low investment cost and low operating cost, is urgently needed.

SUMMERY OF THE UTILITY MODEL

The application provides a printing and dyeing waste water reuse water processing system, short flow, desalination are high, go out that the water quality of water is good, investment cost is low and the working costs is low.

A treatment system for reuse water in printing and dyeing wastewater comprises a sand filtration component, an ultrafiltration water production tank and a reverse osmosis component which are arranged in sequence, and also comprises a back washing component connected with the sand filtration component and the ultrafiltration component; the water inlet of the sand filter assembly is connected with biochemical effluent of printing and dyeing wastewater, the water production outlet of the sand filter assembly is connected with the water inlet of the ultrafiltration assembly, and the water production outlet of the ultrafiltration assembly is connected with an ultrafiltration water production tank; the water inlet of the reverse osmosis component is connected with an ultrafiltration water production tank, the fresh water outlet is connected with a reuse pipeline, and the concentrated water outlet is connected with a concentrated water drain pipe; the backwashing component comprises a backwashing pump and a backwashing pipeline, a water inlet of the backwashing pump is connected with the ultrafiltration water production tank through the backwashing pipeline, and a water outlet of the backwashing pump is respectively connected with the sand filtration component and a water production outlet or a backwashing water inlet of the ultrafiltration component through the backwashing pipeline; the back-flushing water outlets of the sand filtering component and the ultrafiltration component are connected with a back-flushing water drainage pipe.

The system has the advantages of low operating cost, low investment, high desalting rate, good effluent quality and the like, the reuse water rate is more than 50%, the treated effluent reaches the discharge standard of pollutants for textile dyeing and finishing industry, and the reuse water standard of 50% of local environmental protection requirements in certain regions is reached.

Several alternatives are provided below, but not as an additional limitation to the above general solution, but merely as a further addition or preference, each alternative being combinable individually for the above general solution or among several alternatives without technical or logical contradictions.

Optionally, the sand filtering assembly comprises a buffer pool, a booster pump and a sand filtering device which are arranged in sequence; the buffer tank is connected with biochemical effluent of printing and dyeing wastewater, and a water production outlet of the sand filtering device is connected with a water inlet of the ultrafiltration component; and a back washing pipeline connecting the back washing pump and the sand filtering assembly is connected with a water production outlet or a back washing water inlet of the sand filtering device.

Optionally, the sand filtering device is a quartz sand filter; at least two layers of quartz sand with different grain diameters are paved in the quartz sand filter; the diameter range of the upper layer of quartz sand grains is 0.5mm-2mm, and the diameter range of the lower layer of quartz sand grains is 2mm-3 mm; the height of the single-layer quartz sand is 0.3m-0.8 m.

Optionally, the ultrafiltration assembly comprises a coarse filter and an ultrafiltration device, a water inlet of the coarse filter is connected with a water production outlet of the sand filtration assembly, a water outlet of the coarse filter is connected with a water inlet of the ultrafiltration device, and a water production outlet of the ultrafiltration device is connected with the ultrafiltration water production tank; the back washing pipeline connected with the back washing pump and the ultrafiltration component is respectively connected with the water production outlet or the back washing water inlet of the coarse filter and the ultrafiltration device.

Optionally, the coarse filter is a high flux filter element filter; the aperture of the filter element is 30-50 μm; the ultrafiltration membrane element adopted by the ultrafiltration device is a hollow fiber ultrafiltration membrane.

Optionally, a dosing pipe is arranged on a back flushing pipeline connecting the back flushing pump and the ultrafiltration device.

Optionally, the reverse osmosis subassembly includes high-pressure pump, safety filter, reverse osmosis unit, fresh water pond and chemical cleaning device, the water inlet of high-pressure pump is connected the water inlet of safety filter is connected to ultrafiltration product water tank, delivery port, reverse osmosis unit's water inlet is connected to safety filter's delivery port, reverse osmosis unit's fresh water exit linkage fresh water tank, fresh water tank connects the retrieval and utilization pipeline, reverse osmosis unit's dense water exit linkage dense water drainage pipe.

Optionally, the chemical cleaning device includes a rinsing water pump and a chemical pipeline, a water inlet of the rinsing water pump is connected to the fresh water product tank, a water outlet of the rinsing water pump is connected to a back-flushing water inlet of the reverse osmosis device, and the chemical pipeline is connected to an outlet pipeline of the rinsing water pump.

Optionally, the membrane group of the reverse osmosis device adopts a roll-type composite membrane, the membrane pressure container adopts an FRP pressure membrane tube, and the pressure resistance is 300 PSI.

Optionally, the concentrated water discharge pipe is connected with a sewage receiving pipe or evaporation concentration equipment; the backwashing water discharge pipe is connected with a printing and dyeing wastewater pretreatment water storage tank.

Compared with the prior art, the application has at least one of the following beneficial effects:

(1) according to the application, a sand filtration system, an ultrafiltration system, electroosmosis and a reverse osmosis system are effectively combined for use, the water quality of a terminal completely meets the discharge standard of pollutants for textile dyeing and finishing industry (GB4287-2012), and the reuse water rate exceeds 50%.

(2) The method has the advantages of short whole process flow, high water yield of each system unit and low investment and operation cost.

Drawings

Fig. 1 is a schematic structural diagram of the present application.

The reference numerals shown in the figures are as follows:

10-sand filtration component 20-ultrafiltration component 30-ultrafiltration water production tank

40-backwash assembly 50-reverse osmosis assembly

11-buffer tank 12-booster pump 13-sand filter device

14-Biochemical effluent of printing and dyeing wastewater

21-coarse filter 22-ultrafiltration device

41-first backwash pump 42-second backwash pump 43-third backwash pump

44-dosing pipe 45-back flushing drain pipe

51-high pressure pump 52-reverse osmosis device 53-fresh water product water tank

54-flushing water pump 55-medicament pipeline 56-recycling pipeline

57-concentrated water discharge pipe 58-cartridge filter

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

For a better description and illustration of embodiments of the application, reference may be made to one or more of the drawings, but additional details or examples used in describing the drawings should not be construed as limiting the scope of any of the inventive concepts of the present application, the presently described embodiments, or the preferred versions.

It will be understood that when an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. When a component is referred to as being "disposed on" another component, it can be directly on the other component or intervening components may also be present.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

As shown in fig. 1, a system for treating recycled water in printing and dyeing wastewater comprises a sand filtration assembly 10, an ultrafiltration assembly 20, an ultrafiltration water production tank 30, a backwashing assembly 40 and a reverse osmosis assembly 50, wherein the sand filtration assembly 10, the ultrafiltration assembly 20, the ultrafiltration water production tank 30 and the reverse osmosis assembly 50 are sequentially arranged, a water inlet of the sand filtration assembly 10 is connected with biochemical effluent of the printing and dyeing wastewater, and the biochemical effluent is water obtained by physicochemical and biochemical pretreatment of the printing and dyeing wastewater. The water outlet of the sand filter assembly 10 is connected with the water inlet of the ultrafiltration assembly 20, the water outlet of the ultrafiltration assembly 20 is connected with the ultrafiltration water tank 30, the water inlet of the reverse osmosis assembly 50 is connected with the ultrafiltration water tank 30, the fresh water outlet of the reverse osmosis assembly 50 is connected with the reuse pipeline, and the concentrated water outlet of the reverse osmosis assembly 50 is connected with the concentrated water drain pipe. The back washing component 40 is connected with the sand filtering component and the ultrafiltration component. The backwashing component comprises a backwashing pump and a backwashing pipeline, a water inlet of the backwashing pump is connected with the ultrafiltration water production tank through the backwashing pipeline, and a water outlet of the backwashing pump is respectively connected with the sand filtration component and a water production outlet or a backwashing water inlet of the ultrafiltration component through the backwashing pipeline; the backwashing water outlets of the sand filtering component and the ultrafiltration component can be connected to a printing and dyeing wastewater pretreatment water storage tank through a backwashing water discharge pipe, and the sand filtering component and the ultrafiltration component are both subjected to backwashing by adopting ultrafiltration water production.

The printing and dyeing wastewater subjected to conventional physicochemical and biochemical treatment is sequentially treated by the sand filtration component, the ultrafiltration component and the reverse osmosis component, and various pollutants in the wastewater are removed step by step, so that the effluent treatment efficiency of the ultrafiltration device and the reverse osmosis device is improved, and the operation cost is reduced; the sand filtration and ultrafiltration flushing water is subjected to advanced treatment after returning to a physicochemical and biochemical front-end treatment system, and concentrated flushing water is timely put into front-end biochemical treatment, so that the influence of dead circulation enrichment on the water yield of equipment is avoided; and discharging the reverse osmosis concentrated water to a sewage receiving pipe.

Printing and dyeing wastewater gets rid of behind most suspended solid and the COD through sand filtration device, ultrafiltration device and reverse osmosis unit in proper order after front end preliminary treatment and biochemical treatment, carries out insoluble impurity, flocculation thing, macromolecular organic matter, colloid and microorganism in proper order, and soluble salinity is got rid of, and reverse osmosis produces the water and carries to individual water use workshop, and the dense water of reverse osmosis is outer arranging through receiving dirty tub.

The sand filtration component is used for filtering most insoluble micro impurities and floccules and organic matters of partial colloids in the inlet water, reducing the turbidity and suspended matters of the outlet water and enabling the water quality of the outlet water of the filter to reach the water inlet requirement of the follow-up ultrafiltration device.

In one embodiment of the sand filtration assembly, the sand filtration assembly 10 comprises a buffer tank 11, a booster pump 12 and a sand filtration device 13 which are arranged in sequence; the buffer tank 11 is connected with biochemical effluent 14 of the printing and dyeing wastewater, the booster pump 12 is connected with a water outlet of the buffer tank 11 and a water inlet of the sand filter device 13, and a water production outlet of the sand filter device is connected with a water inlet of the ultrafiltration component 20; the first backwash pump 41 is connected to the ultrafiltration water production tank 30 and the water production outlet or backwash water inlet of the sand filtration device 13.

As a specific embodiment of the sand filtering device 13, the sand filtering device is preferably a quartz sand filter, at least two layers of quartz sand with different grain sizes are paved in the filter, the diameter of the upper layer of quartz sand is in the range of 0.5mm-2mm, the diameter of the lower layer of quartz sand is in the range of 2mm-3mm, the height of the single layer of quartz sand is in the range of 0.3m-0.8m, and the height of the single layer of quartz sand is preferably 0.5 m.

The ultrafiltration component intercepts macromolecular organic matters, colloid and microorganism such as suspended matters in water through an ultrafiltration membrane, and the requirement of reverse osmosis inlet water quality is guaranteed. As an embodiment of the ultrafiltration module, the ultrafiltration module 20 comprises a coarse filter 21 and an ultrafiltration device 22, wherein a water inlet of the coarse filter 21 is connected with a water production outlet of the sand filtration device 13, and a water production outlet of the ultrafiltration device 22 is connected with an ultrafiltration water production tank 30; the second back-flushing pump 42 is connected with the water production outlet or the back-flushing inlet of the ultrafiltration water production tank 30 and the coarse filter 21 through a back-flushing pipeline, the third back-flushing pump 44 is connected with the water production outlet or the back-flushing inlet of the ultrafiltration water production tank 30 and the ultrafiltration device 22 through a back-flushing pipeline, and a dosing pipe 44 is connected to an outlet pipeline of the third back-flushing pump.

The clear water after the sand filtration is removed with light suspended matters and large particle colloids through a coarse filter, the filtration load of the ultrafiltration device is reduced, the rapid blockage on the surface of the ultrafiltration membrane is avoided, and the water production efficiency of the ultrafiltration device is reduced.

As a specific embodiment of the coarse filter, the coarse filter employs a high-flux cartridge filter; the aperture of the filter element is 30-50 μm. As a specific implementation mode of the ultrafiltration device, an ultrafiltration membrane element adopted by the ultrafiltration device is a hollow fiber ultrafiltration membrane, and has the advantages of pollution resistance and high suspended matter resistance.

In order to remove quartz sand in the sand filter and pollutants intercepted on the surface of an ultrafiltration membrane of the ultrafiltration device, corresponding backwashing devices are respectively arranged, backwashing clear water is subjected to ultrafiltration to produce water, and backwashing effluent is returned to the physicochemical and biochemical front ends through a pipeline for water treatment.

The reverse osmosis component is used for removing residual soluble salt, colloid, organic substances and the like in water. As an embodiment of the reverse osmosis module, the reverse osmosis module 50 comprises a high pressure pump 51, a cartridge filter 58, a reverse osmosis device 52, a fresh water reservoir 53 and a chemical cleaning device, wherein the outlet water of the ultrafiltration product water tank 30 is connected to the inlet of the high pressure pump 51, the outlet of the high pressure pump 51 is connected to the inlet of the cartridge filter 58, the outlet of the cartridge filter 58 is connected to the inlet of the reverse osmosis device 52, and the yield product water is filtered by the cartridge filter 58 and then enters the reverse osmosis device 52. The fresh water outlet of the reverse osmosis device 52 is connected with a fresh water product water tank 53, the fresh water product water tank 53 is connected with a reuse pipeline 56, the concentrated water outlet of the reverse osmosis device 52 is connected with a concentrated water discharge pipe 57, and the concentrated water discharge pipe 57 is connected with a sewage receiving pipe or evaporation concentration equipment.

As an embodiment of the chemical cleaning device, the chemical cleaning device comprises a flushing water pump 54 and a chemical pipeline 55, wherein a water inlet of the flushing water pump 54 is connected with a fresh water product water tank 53, a water outlet of the flushing water pump 54 is connected with a back flushing water inlet of the reverse osmosis device 52, and the chemical pipeline 55 is connected to an outlet pipeline of the flushing water pump 54.

As a specific embodiment of the reverse osmosis device, the membrane group of the reverse osmosis device 52 adopts a roll-type composite membrane, and the membrane pressure container of the reverse osmosis device 52 adopts FRP pressure membrane pipes with the pressure resistance of 300 PSI. The operating pressure of the reverse osmosis membrane is 15-25MPa, and the salt content of the produced fresh water is less than 0.05%.

The fresh water after ultrafiltration is delivered to a cartridge filter by a high-pressure pump to remove ultrafine particles in the water and then enters a reverse osmosis membrane component, the fresh water passes through a membrane layer by utilizing the pressure difference provided by the high-pressure pump and is discharged to a reverse osmosis water producing tank from a fresh water outlet, the fresh water is delivered to a reuse water workshop by a pump, concentrated water continuously flows along the membrane layer, the volume of the concentrated water after reverse osmosis concentration is reduced to 25-35% of that of reverse osmosis inlet water, and the concentrated water is discharged to a sewage accommodating pipe from a concentrated water outlet.

During operation of the device, backwashing and chemical cleaning of the sand filter device, the ultrafiltration device and the reverse osmosis device are performed in a timing automatic flushing mode, but the ultrafiltration device and the reverse osmosis device are also required to be provided with a protection automatic flushing program according to the pressure difference of the inlet and the outlet of the membrane to perform pollutant backwashing on the surface of the membrane.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims

1. A treatment system for reuse water in printing and dyeing wastewater is characterized by comprising a sand filtration component, an ultrafiltration water production tank, a reverse osmosis component and a back washing component, wherein the sand filtration component, the ultrafiltration water production tank and the reverse osmosis component are sequentially arranged; the water inlet of the sand filter assembly is connected with biochemical effluent of printing and dyeing wastewater, the water production outlet of the sand filter assembly is connected with the water inlet of the ultrafiltration assembly, and the water production outlet of the ultrafiltration assembly is connected with an ultrafiltration water production tank; the water inlet of the reverse osmosis component is connected with an ultrafiltration water production tank, the fresh water outlet is connected with a reuse pipeline, and the concentrated water outlet is connected with a concentrated water drain pipe; the backwashing component comprises a backwashing pump and a backwashing pipeline, a water inlet of the backwashing pump is connected with the ultrafiltration water production tank through the backwashing pipeline, and a water outlet of the backwashing pump is respectively connected with the sand filtration component and a water production outlet or a backwashing water inlet of the ultrafiltration component through the backwashing pipeline; the back-flushing water outlets of the sand filtering component and the ultrafiltration component are connected with a back-flushing water drainage pipe.

2. The system for treating reclaimed water in printing and dyeing wastewater according to claim 1, wherein the sand filter assembly comprises a buffer tank, a booster pump and a sand filter device which are arranged in sequence; the buffer tank is connected with biochemical effluent of printing and dyeing wastewater, and a water production outlet of the sand filtering device is connected with a water inlet of the ultrafiltration component; and a back washing pipeline connecting the back washing pump and the sand filtering assembly is connected with a water production outlet or a back washing water inlet of the sand filtering device.

3. The system for treating reclaimed water in printing and dyeing wastewater according to claim 2, wherein the sand filter device is a quartz sand filter; at least two layers of quartz sand with different grain diameters are paved in the quartz sand filter; the diameter range of the upper layer of quartz sand grains is 0.5mm-2mm, and the diameter range of the lower layer of quartz sand grains is 2mm-3 mm; the height of the single-layer quartz sand is 0.3m-0.8 m.

4. The system for treating reclaimed water in printing and dyeing wastewater as claimed in claim 1, wherein the ultrafiltration assembly comprises a coarse filter and an ultrafiltration device, the water inlet of the coarse filter is connected with the water production outlet of the sand filtration assembly, the water outlet of the coarse filter is connected with the water inlet of the ultrafiltration device, and the water production outlet of the ultrafiltration device is connected with the ultrafiltration water production tank; the back washing pipeline connected with the back washing pump and the ultrafiltration component is respectively connected with the water production outlet or the back washing water inlet of the coarse filter and the ultrafiltration device.

5. The system for treating reclaimed water in printing and dyeing wastewater according to claim 4, wherein the coarse filter is a high-flux filter element filter; the aperture of the filter element is 30-50 μm; the ultrafiltration membrane element adopted by the ultrafiltration device is a hollow fiber ultrafiltration membrane.

6. The system for treating reclaimed water in printing and dyeing wastewater according to claim 4, wherein a chemical feeding pipe is arranged on a back washing pipeline connecting the back washing pump and the ultrafiltration device.

7. The system for treating reclaimed water in printing and dyeing wastewater according to claim 1, wherein the reverse osmosis module comprises a high-pressure pump, a cartridge filter, a reverse osmosis device, a freshwater pool and a chemical cleaning device, a water inlet of the high-pressure pump is connected with the ultrafiltration product water tank, a water outlet of the high-pressure pump is connected with a water inlet of the cartridge filter, a water outlet of the cartridge filter is connected with a water inlet of the reverse osmosis device, a freshwater outlet of the reverse osmosis device is connected with the freshwater pool, the freshwater pool is connected with the reuse pipeline, and a concentrated water outlet of the reverse osmosis device is connected with the concentrated water discharge pipe.

8. The system for treating reclaimed water in printing and dyeing wastewater according to claim 7, wherein the chemical cleaning device comprises a flushing water pump and a chemical pipeline, the water inlet of the flushing water pump is connected with the freshwater product water tank, the water outlet of the flushing water pump is connected with the back-flushing water inlet of the reverse osmosis device, and the chemical pipeline is connected to the outlet pipeline of the flushing water pump.

9. The system for treating reclaimed water in printing and dyeing wastewater according to claim 7, wherein a membrane group of the reverse osmosis device adopts a roll-type composite membrane, a membrane pressure container adopts an FRP pressure membrane pipe, and the pressure resistance is 300 PSI.

10. The reclaimed water treatment system in printing and dyeing wastewater according to claim 1 or 7, wherein the concentrated water discharge pipe is connected with a sewage receiving pipe or an evaporation and concentration device; the backwashing water discharge pipe is connected with a printing and dyeing wastewater pretreatment water storage tank.