CN201250159Y - Complete equipment used for treating dyeing light pollution waste water for reuse - Google Patents

Abstract

A complete set of equipment for the treatment and reuse of lightly polluted printing and dyeing wastewater, which belongs to the technical field of manufacturing equipment for the treatment and recycling of printing and dyeing wastewater. A regulating tank (4) with a submersible mixer (5) and a lifting pump (6), a moving bed bioreactor (7), a sedimentation and separation tank (10) with a mud discharge bucket (11) at the bottom, and an intermediate pool (12) , a secondary lifting pump (15), a backwash self-cleaning filter (16), a reuse pool (17), a recycling lifting pump (18), an automatic recycling system (19), etc.; a secondary lifting pump (15 ) and the backwash self-cleaning filter (16) are also provided with a dosing pump (14) with a dosing device (13). The design is reasonable, the overall structure is compact, the treatment effect is good, and energy is saved. It can ensure the stability of the water quality index of the recycled water after treatment, achieve the purpose of wastewater reuse, and meet the production requirements of enterprises.

Description

Complete set of equipment for treatment and reuse of lightly polluted wastewater from printing and dyeing

technical field

The utility model relates to a complete set of equipment for treating and recycling lightly polluted printing and dyeing wastewater, which belongs to the technical field of manufacturing equipment for treating and recycling printing and dyeing wastewater.

Background technique

The printing and dyeing industry is a large player in the industrial drainage industry. The amount of wastewater discharged is large, the content of organic pollutants is high, the color is deep, the alkalinity is high, and the biodegradability is poor. It is one of the industrial wastewater that is difficult to treat. In recent years, with the development of new chemical fibers, imitation silk, and printing and dyeing finishing technologies, a large number of refractory organic substances such as polyvinyl alcohol new additives have entered wastewater, which has increased the difficulty of wastewater treatment and reduced the removal efficiency of the original biological treatment system. Obvious reduction. Because of the above-mentioned characteristics of printing and dyeing wastewater, it not only makes it more difficult to meet the standards of wastewater treatment, but also increases the cost of treatment, and affects the reuse of wastewater.

In recent years, people have made a lot of explorations on the recycling technology of dyeing wastewater. At present, there are mainly the following combined schemes for the deep reuse of dyeing wastewater:

1. Printing and dyeing wastewater concrete air flotation sand filter Activated carbon adsorption Reuse. This scheme is completely a combination of physical and chemical technologies, which can remove colloidal substances in a more targeted manner, so that the effluent can meet the reuse requirements, but the main disadvantage is that it cannot adapt to the characteristics of large changes in the water quality of dyeing sewage.

2. Wastewater treatment station effluent biofiltration Ozone decolorization double layer filter Cation exchange resin softens effluent Reuse. This solution is a typical combination of various treatment methods. The disadvantage is that the operation cost is relatively high, and it is difficult to promote in areas with sufficient water sources.

3. Dyeing wastewater Coagulation and sedimentation internal circulation anaerobic HCR/biological activated carbon filter adsorption contact oxidation fiber ball filter Reuse. This scheme combines the HCR method with the bioactivated carbon method, which occupies a small area and the fiber ball has the characteristics of fast filtration speed and excellent effect, so that the wastewater can meet the reuse requirements stably. However, compared with the traditional printing and dyeing water treatment process, this process still has the disadvantages of high investment cost and operating cost, and it will cause the accumulation of salt after long-term operation, which will affect the product quality.

4. Secondary treatment effluent Electrochemical treatment chemical flocculation ion exchange Reuse. The advantage of advanced treatment of printing and dyeing wastewater by electrochemical method combined with chemical flocculation and ion exchange method is that the effluent quality is good and can be reused in all dyeing processes. The disadvantage is that the process is sensitive to pH value. Ion concentration and conductivity, this scheme is more dependent on ion exchange resin, so the frequency of ion regeneration is inevitable.

5. Printing and dyeing wastewater Add acid to adjust pH Iron carbon filter Neutralize with alkali Batch Activated Sludge Process (SBR) Reuse. The iron-carbon filter system uses scrap iron chips whose main components are iron and carbon. After pretreatment and activation, it can be used as filler. The advantage of this process is to treat waste with waste, and the operation is stable. The disadvantage is that the pH value must be adjusted back and forth.

6. Outlet of secondary settling tank primary sand filter _ClO2 oxidation secondary filter activated carbon Reuse. The process is easy to operate, especially effective in removing chroma, but the cost of this process is high, and the factory must have a certain scale of printing and dyeing wastewater treatment process, and the influent of this treatment process has been discharged up to the standard, which has certain limitations sex.

Contents of the invention

The purpose of the utility model is to provide a complete set of equipment for the treatment and reuse of lightly polluted wastewater from printing and dyeing with reasonable design, compact overall structure, good treatment effect and energy saving.

The utility model is a complete set of equipment for the treatment and reuse of lightly polluted wastewater from printing and dyeing. The sedimentation and separation tank of the mud bucket, the intermediate pool, the secondary lifting pump, the backwash self-cleaning filter, the recycling pool, the recycling lifting pump, and the automatic recycling system; the moving bed bioreactor is equipped with a packing layer, A microporous aerator with an external air pump fan is provided at the bottom, and a water inlet and a porous outlet weir box are respectively provided on both sides of the upper part; the sludge discharge bucket is connected with the sludge concentration tank through a sludge return pump; The backwash self-cleaning filter is equipped with a clean water tank, a siphon, an upper cover, a water inlet pipe with a baffle on the top, a filter material layer, a porous filter head, a bottom clean water area, a filter material layer and backwash from top to bottom. The inner wall of the self-cleaning filter is provided with a water outlet area respectively connected with the bottom clean water area and the clean water tank, and the siphon is connected with the sludge thickening tank.

The sludge thickening tank can be connected with a plate and frame filter press through a screw pump.

A sieve can also be provided between the automatic diversion pipeline and the regulating tank, so as to intercept the slag in the lightly polluted wastewater.

The sludge discharge hopper can also be connected with the water inlet of the moving bed bioreactor through a sludge return pump and a pipeline.

A dosing pump with a dosing device can also be provided between the secondary lifting pump and the backwash self-cleaning filter, and the clean water flowing into the backwash self-cleaning filter can be further treated in advance by adding aluminum salt. Coagulation treatment. The secondary lifting pump can also be connected to the regulating tank through pipelines, so as to further perform repeated treatment on the clean sewage after aluminum salt coagulation treatment.

The reused lifting pump can also be connected to the reused water pool or/and the regulating tank through pipelines, so as to further perform repeated treatment on the clean sewage.

Compared with the prior art, the utility model has the following outstanding advantages and positive effects:

1. The waste water is automatically diverted according to the quality through the automatic diversion pipe, so that the light polluted waste water discharged from the workshop and the concentrated sewage waste water are discharged separately, and the light polluted waste water is automatically collected every minute, and other high-concentration sewage is collected separately. After treatment, it is discharged to Intercept the sewage pipe network and enter the sewage treatment plant for centralized collection and treatment.

2. Using a moving bed bioreactor. Aiming at the characteristics of low COD concentration and moderate B/C value of lightly polluted wastewater, a moving bed composed of a packing layer and a microporous aerator is set in the moving bed bioreactor. The packing in the packing layer is the support and carrier of the biofilm , make the sewage in the aerobic state, through the microbial adsorption in the packing layer and quickly degrade the biodegradable organic pollutants in the lightly polluted wastewater; at the same time, the oxygen is evenly flushed into the packing layer by means of the microporous aerator, so that The filler produces shearing, blocking and adsorption effects on the bubbles, which increases the residence time of the bubbles and the gas-liquid contact area, improves the mass transfer efficiency and saves energy.

3. Backwashing self-cleaning filter is adopted, and the standard points required after wastewater treatment are reused for production. Therefore, it is required to remove all granular impurities. According to the principle of mature technology and low investment, the backwash self-cleaning filter is combined with multi-media backwash filtration and activated carbon adsorption. The filter material in the filter material layer uses quartz sand, anthracite and biological granular activated carbon to further decolorize and remove adsorbed suspended particles. Ensure the stability of the effluent water quality and meet the requirements of treating wastewater for reuse in the previous production process.

4. The submersible mixer is used in the adjustment tank, which can effectively fully stir the sewage entering the adjustment tank to adjust the price-reduced organic matter, ensure the high treatment function of the subsequent treatment process and prevent water acidification. In addition, the use of screens to intercept large pollutants can further avoid clogging of the lift pump in the adjustment pool.

5. Adopting the chemical process after the biochemical effluent, the biological excess active pollutants are separated by sedimentation in the sedimentation separation tank, and the sludge is settled and concentrated, and then returned to the moving bed bioreactor for mixed treatment, which can further improve the biochemical Activity and treatment effect.

6. Automatic reuse, on the basis of not affecting product quality, not increasing production costs and reducing operating costs as much as possible, and on the basis of analyzing the water quality requirements of each workshop section, research and formulate an optimization plan for using reused water by section, quality and time , designed and compiled into a reuse water treatment system where the sludge return pump is connected to the inlet pipe of the moving bed bioreactor, the secondary lift pump is connected to the adjustment tank, and the reuse lift pump is respectively connected to the reuse water tank or/and the adjustment tank The system automatically controls the equipment system for water discharge, so that the treated clean water can be reused in the production of each process.

7. With the sludge treatment system in the prior art, due to the relatively large amount of water, the amount of sludge produced is also quite large. Sludge gravity concentration and plate and frame filter press in the sludge concentration tank are used to process the generated sludge, and comprehensive utilization is used to prevent secondary pollution.

According to the different water quality requirements of each process in the printing and dyeing industry and the different water quality characteristics of the wastewater discharged from each process, the utility model adopts the waste water automatic shunt technology, and combines the decolorization, oxidation, and high-efficiency purification of the moving bed bioreactor and the backwash self-cleaning filter. Rinse, self-cleaning, filtration and other processes, the integrated technology of advanced treatment and reuse of wastewater to realize the separation of wastewater according to quality and remove pollutants such as COD, BOD, SS, chroma, turbidity, etc. in wastewater, to ensure the reuse of water after treatment The water quality index is stable, the purpose of wastewater reuse can be achieved, and the production requirements of enterprises can be met. After the sludge produced by purification is processed by a plate and frame filter press, the dried sludge is comprehensively utilized. After actual operation of the utility model, after treatment, COD≤100mg/L, turbidity≤5 degrees, suspended solids≤20mg/L, pH: 7-7.5, chroma≤15 times. After treatment, it can be reused in pretreatment, dyeing, rinsing water and other processes. Reuse water consumption can reach more than 95%. Save water resources and raw materials, effectively reduce the pollution of printing and dyeing wastewater to the environment, meet the requirements of circular economy and clean production policies, and help reduce the existing water intake. Energy conservation and emission reduction, protection of natural resources, provide a strong guarantee for the construction of the ecological environment.

Description of drawings

Fig. 1 is the overall structural representation of the utility model;

Fig. 2 is the enlarged structural sectional view of the backwash self-cleaning filter described in the utility model;

Fig. 3 is the top view of the enlarged structure of the backwash self-cleaning filter described in the utility model;

Fig. 4 is an enlarged structural sectional view of the moving bed bioreactor of the present invention.

In the figure, 1 is the wastewater collection tank, 2 is the automatic diversion pipe, 3 is the screen, 4 is the regulating tank, 5 is the submersible mixer, 6 is the lift pump, 7 is the moving bed bioreactor, and 8 is the microporous aerator , 9 is the air pump fan, 10 is the sedimentation separation tank, 11 is the mud discharge bucket, 12 is the intermediate pool, 13 is the dosing device, 14 is the dosing pump, 15 is the secondary lifting pump, 16 is the backwash self-cleaning filter 17 is a reuse pool, 18 is a reuse lift pump, 19 is an automatic reuse system, 20 is a sludge thickening tank, 21 is a screw pump, 22 is a plate and frame filter press, 23 is a sludge return pump, 24 25 is a clean water tank, 26 is a siphon, 27 is a filter material layer, 28 is a porous filter head, 29 is an air outlet, 30 is a water inlet pipe, 31 is a baffle, 32 is an upper cover, 33 34 is the clean water area at the bottom, 35 is the water outlet area, 36 is the packing layer, 37 is the porous water outlet weir box, 38 is the interception net, 39 is the aeration pipe, 40 is the water inlet, 41 is the dissolved oxygen measurement port, 42 is a water level control measuring port, and 43 is a mud discharge port.

Detailed ways

The utility model is mainly composed of a workshop waste water collection pool 1 connected in sequence, an automatic diversion pipe 2, a screen 3, a regulating pool 4 with a submersible mixer 5 and a lifting pump 6 inside, a moving bed bioreactor 7, and a mud discharge bucket 11 at the bottom The settling and separating tank 10, the intermediate pool 12, the secondary lifting pump 15, the backwashing self-cleaning filter 16, the recycling water tank 17, the recycling lifting pump 18, the automatic recycling system 19, etc. A dosing pump 14 with a dosing device 13 is also provided between the secondary lift pump 15 and the backwash self-cleaning filter 16 .

The moving bed bioreactor 7 is provided with a packing layer 36, the upper part is provided with a water inlet 40 and a porous water outlet weir box 37, and the bottom is provided with a microporous aerator 8 and a mud discharge port 43 for emergency or maintenance. The packing layer 36 Covered with an intercepting net 38 to block the overflow of the filler, the microporous aerator 8 is connected to the external air pump fan 9 through the aeration pipe 39, and the dissolved oxygen (DO) measurement for real-time measurement is arranged in the filler layer 36. Port 41 and level control (LIC) measuring port 42.

The sludge discharge hopper 11 is connected to the sludge thickening tank 20 through the sludge return pump 23 , and the sludge thickening tank 20 is connected to the plate and frame filter press 22 through the screw pump 21 .

The backwash self-cleaning filter 16 is provided with a clean water tank 25, a siphon 26, an upper cover 32, a water inlet pipe 30 with a baffle 31 on the top, a filter material layer 27, a porous filter head 28, and a bottom clean water area from top to bottom. 34. Between the filter material layer 27 and the inner wall of the backwash self-cleaning filter 16, there is a water outlet area 35 that communicates with the bottom clean water area 34 and the clean water tank 25 respectively, and the siphon 26 is connected with the sludge thickening tank 20. The vent 29 at the bottom of the backwash self-cleaning filter 16 is used for discharge during maintenance and emergency, and the maintenance hole 33 on the side is used for maintenance and replacement of filter material.

The operation of the utility model is carried out synchronously with the production in the workshop, and the specific operation steps are as follows:

1. Sewage is automatically divided and collected according to the quality and time. The production wastewater flows from the workshop into the wastewater collection tank 1, and the lightly polluted wastewater flows into the adjustment tank 4 through the automatic diversion pipe 2, and the screen 3 is used to intercept and separate large suspended solids, etc. dirt.

2. Use a submersible mixer 5 in the regulating tank 4 to fully stir the lightly polluted wastewater in the regulating tank 4 to prevent water quality from acidifying and deteriorating. Through the lifting pump 6, the lightly polluted wastewater enters the moving bed bioreactor 7 from the water inlet 40 , use the air pump fan 9 to charge oxygen into the microporous aerator 8 at the bottom of the moving bed bioreactor 7 through the aeration pipe 39, and evenly flush the oxygen into the packing layer 36, so that the sewage is in an aerobic state Through the adsorption of microorganisms in the packing layer 36 and the rapid price reduction of biodegradable organic matter in lightly polluted wastewater, pollutants such as COD, BOD, SS, chroma, and turbidity in the wastewater are reduced to the quality requirements of reused water, and dissolved oxygen ( DO) measuring port 41 and water level control (LIC) measuring port 42 are measured in real time to meet the requirements and enter the next process to ensure that the reused water quality index after treatment is stable and meets the reuse requirements.

3. The water quality purified by the moving bed bioreactor 7 flows from the porous outlet weir box 37 to the sedimentation and separation tank 10 to separate the water quality from the sludge, the clean sewage flows to the intermediate pool 12, and the settled sludge enters the sludge discharge hopper 11. And return to the moving bed bioreactor 7 through the sludge return pump 23, and fully mix the sludge with the microorganisms in the moving bed bioreactor 7 to improve the treatment effect. The further treated sludge enters the sludge discharge hopper 11 and enters the sludge thickening tank 20 through the sludge return pump 23 .

4. For advanced treatment, the backwash self-cleaning filter 16 is used to further remove granular impurities. The water in the middle pool 12 enters the backwash self-cleaning filter 16 from the water inlet pipe 30 through the fast lifting pump 15, passes through the filter material layer 27 and passes through the multi-layer Filtration, decolorization and adsorption. The filter material of the filter material layer is made of quartz sand, anthracite, and activated carbon. In addition to filtration, it also has the effect of decolorization. When the pressure reaches a certain level, the filter material layer 27 will automatically recoil the sludge, and the clean sewage will be filtered through the porous filter head 28 to the bottom clean water area 34, and then flow smoothly from the water outlet area 35 to the reuse pool 17 through the clean water tank 25. When the automatically recoiled sludge layer on the filter material layer 27 reaches a certain thickness, the siphon tube 26 will automatically discharge the sludge layer, so that the backwash self-cleaning filter 16 can run continuously to ensure clear water, and the filter material layer 27 will remain clean for a long time , to ensure the treatment effect and improve the reuse rate of effluent, the sludge discharged from the siphon pipe 26 is sent to the sludge concentration tank 20, and is processed by the plate and frame filter press 22 for comprehensive utilization.

5. Clean sewage flows into the reuse pool 17, enters the automatic reuse system 19 through the lift pump 18, and goes to the production process of the workshop.

6. Due to the relatively large amount of water and the amount of sludge, the sludge gravity concentration and plate-and-frame filter press 22 is used to process the generated sludge, and it enters the dry mud export device 24, waiting to be transported to make bricks and synthesized Use to prevent secondary pollution.

7. According to the optimization scheme of using reused water by subsection, quality and time, the sludge return pump 23 is designed to be connected to the water inlet pipe 40 of the moving bed bioreactor 7, and the secondary lift pump 15 is connected to the regulating tank 4, Reuse the lift pump 18 to the reuse water treatment system effluent automatic control equipment system respectively connected to the reuse water pool 17 or/and the regulating pool 4, so that the treated clean sewage can be reused in the production of each process at a specific place and time .

Claims (7)

1. A complete set of equipment for the treatment and reuse of lightly polluted wastewater from printing and dyeing, which is characterized in that it includes successively connected workshop wastewater collection pools (1), automatic diversion pipelines (2), submersible mixers (5) and lift pumps (6) inside. Adjusting tank (4), moving bed bioreactor (7), sedimentation and separation tank (10) with sludge discharge bucket (11) at the bottom, intermediate pool (12), secondary lifting pump (15), backwash self-cleaning filter Device (16), reuse pool (17), reuse lift pump (18), automatic recycling system (19); described moving bed bioreactor (7) is provided with packing layer (36), and the bottom is provided with There is a microporous aerator (8) with an external air pump fan (9), and a water inlet (40) and a porous water outlet weir box (37) are respectively arranged on both sides of the upper part; The mud return pump (23) is connected with the sludge thickening tank (20); the described backwash self-cleaning filter (16) is provided with a clear water tank (25), a siphon (26), and an upper seal successively from top to bottom. Cover (32), water inlet pipe (30) with baffle plate (31) on the top, filter material layer (27), porous filter head (28), bottom clean water area (34), filter material layer (27) and backwash self A water outlet area (35) that is respectively communicated with the bottom clear water area (34) and the clear water tank (25) is provided between the clean filter (16) inwall, and the siphon (26) is connected with the sludge thickening tank (20). 2. The complete set of equipment for the treatment and reuse of lightly polluted printing and dyeing wastewater according to claim 1, characterized in that the sludge thickening tank (20) is connected to the plate and frame filter press (22) through a screw pump (21). 3. The complete set of equipment for treatment and reuse of lightly polluted printing and dyeing wastewater according to claim 1, characterized in that there is a screen (3) between the automatic diversion pipe (2) and the regulating pool (4). 4. The complete set of equipment for the treatment and reuse of lightly polluted printing and dyeing wastewater according to claim 1, characterized in that the sludge discharge bucket (11) is also connected to the moving bed bioreactor (7) through the sludge return pump (23) and the pipeline. The water inlet (40) is connected. 5. The complete set of equipment for the treatment and reuse of lightly polluted printing and dyeing wastewater according to claim 1, characterized in that there is a belt dosing filter between the secondary lifting pump (15) and the backwash self-cleaning filter (16). The dosing pump (14) of the device (13). 6. The complete set of equipment for the treatment and reuse of lightly polluted printing and dyeing wastewater according to claim 1 or 5, characterized in that the secondary lift pump (15) is also connected to the regulating pool (4) through pipelines. 7. The complete set of equipment for the treatment and recycling of lightly polluted printing and dyeing wastewater according to claim 1, characterized in that the recycling lift pump (18) is also connected to the recycling water pool (17) or/and the regulating pool (4 ) are connected.

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