CN202400930U - Low-sludge-yield printing and dyeing wastewater treatment system - Google Patents

Abstract

The utility model discloses a printing and dyeing wastewater treatment system with low sludge yield. Inlet pumps, valves, flow meters, anaerobic hydrolysis zone, biological selection zone, bio-enhanced predation and aerobic sludge reduction zone are connected in sequence. Submersible mixers and biological filler carriers are installed in the anaerobic hydrolysis zone. There is a submersible mixer, and an aeration device is installed at the bottom of the biological selection area and the bio-enhanced predation aerobic sludge reduction area. The upper part of the sludge reduction area is connected to the bottom of the secondary settling tank. The upper part of the secondary settling tank is provided with an outlet pipe. The bottom of the secondary settling tank is connected to the bottom of the anaerobic hydrolysis area and the bottom of the biological selection area through the sludge return pump and sludge pipe in the sedimentation area. The low-yield process of printing and dyeing wastewater of the utility model is applicable to all activated sludge processes and deformation processes thereof, and can be used in new constructions and renovations of existing projects.

Description

A printing and dyeing wastewater treatment system with low sludge yield

technical field

The utility model relates to the technical field of biological engineering and environmental engineering, in particular to a printing and dyeing wastewater treatment system with low sludge yield. the

Background technique

The daily discharge of printing and dyeing wastewater in China is (3~4)×10 ⁶ t, and it is one of the major pollutant dischargers in various industries, accounting for about 35% of the total industrial wastewater discharge. Printing and dyeing wastewater is mainly composed of desizing wastewater, boiling wastewater, bleaching wastewater, mercerizing wastewater, dyeing wastewater and printing wastewater. The four processes of printing and dyeing processing must discharge wastewater. The pretreatment stage (including desizing, scouring, bleaching, mercerizing and other processes) to discharge desizing wastewater, boiling wastewater, bleaching wastewater and mercerizing wastewater, dyeing wastewater is discharged from the dyeing process, printing wastewater and soap wastewater are discharged from the printing process, and finishing wastewater is discharged from the finishing process. Usually, printing and dyeing wastewater is mixed wastewater of the above types of wastewater, or comprehensive wastewater other than bleaching wastewater. The water quality of printing and dyeing wastewater varies with the fiber types and processing techniques used, and the pollutant components vary greatly. Printing and dyeing wastewater generally has the characteristics of high pollutant concentration, many types, toxic and harmful components, and high chroma. Generally, the pH value of printing and dyeing wastewater is 6-10, CODCr is 400-1000mg/L, BOD ₅ is 100-400mg/L, SS is 100-200mg/L, and the chroma is 100-400 times. However, when the printing and dyeing process, the type of fiber used and the processing technology change, the quality of wastewater will change greatly. In recent years, due to the development of chemical fiber fabrics, the rise of imitation silk and the progress of printing and dyeing finishing technology, PVA pulp, rayon alkali hydrolyzate (mainly phthalic acid substances), new additives and other difficult biodegradable organic substances A large amount of printing and dyeing wastewater enters, and its COD _Cr concentration rises from hundreds of mg/L to over 2000-3000mg/L, BOD ₅ increases to over 800mg/L, and pH reaches 11.5-12, so that the original biological The COD _Cr removal rate of the treatment system is reduced.

Commonly used methods for printing and dyeing wastewater treatment include physical, chemical and biochemical methods, and usually a combination of several methods can meet the requirements. No matter which method is used to treat printing and dyeing wastewater, it will produce secondary pollutants—sludge, so the pursuit of minimizing sludge is also an issue that needs to be considered in engineering design. In the sewage treatment process, various sludge reduction technologies that reduce the excess sludge production rate in situ and reduce the excess sludge production from the source have become the focus and development direction of wastewater biological treatment research. The sludge reduction technology of metazoans preying on microorganisms has attracted widespread attention from scholars at home and abroad because of its advantages of cost-effectiveness and no secondary pollution. The metazoan in situ sludge digestion technology is based on the ecological theory, based on the principle of gradual decrease of matter and energy in the food chain transfer process, by strengthening the predation of metazoans in the food chain to reduce the amount of excess sludge, in order to ensure the effluent Under the premise of meeting the water quality standards, the treatment and disposal of sludge will be transferred from "end treatment" to "source control" to a certain extent. Metazoans feed on organic debris and dead organisms. With the reduction of organic matter in the water, rotifers, oligochaetes, and nematodes appeared, and the rotifers could swallow the scattered sludge,

The use of micro-metazoans for sludge reduction not only achieves a high sludge reduction effect, but also has the advantages of less energy consumption, low operating costs, no by-products, and no secondary pollution to the environment.

Contents of the invention

The purpose of the utility model is to overcome the problem of large amount of sludge produced in the existing printing and dyeing wastewater treatment process, and provide a printing and dyeing wastewater treatment system with low sludge yield. the

The printing and dyeing wastewater treatment system with low sludge yield includes water inlet pump, valve, flow meter, submersible mixer, blower, anaerobic hydrolysis zone, biological selection zone, bio-enhanced predation aerobic sludge reduction zone, secondary settling tank, aeration Equipment, sludge return pump in sedimentation area, metazoan cultivation dosing tank, sludge scraper, biological filler carrier, sludge pipe and outlet pipe; water inlet pump, valve, flow meter, anaerobic hydrolysis area, biological selection area, bioaugmentation The predation aerobic sludge reduction area is connected in sequence, the anaerobic hydrolysis area is equipped with a submersible mixer and biological filler carrier, the biological selection area is equipped with a submersible mixer, the biological selection area, and the bottom of the bio-enhanced predation aerobic sludge reduction area An aeration device is provided, the blower is connected with the aeration device, the metazoan cultivation dosing tank is connected with the bio-enhanced predation aerobic sludge reduction area, and the upper part of the bio-enhanced predation aerobic sludge reduction area is connected with the bottom of the secondary sedimentation tank. There is a sludge scraper inside the secondary settling tank, and an outlet pipe is installed on the upper part of the secondary settling tank. The bottom of the secondary settling tank is connected to the bottom of the anaerobic hydrolysis zone and the bottom of the biological selection zone through the sludge return pump and sludge pipe in the sedimentation zone. the

The utility model has the beneficial effects compared with the prior art:

1) The technological process is simple and easy to operate and manage.

2) Using the food chain to strengthen the technology of micro-animals to prey on bacteria, and finally reduce the output of sludge itself, resulting in the transfer of sludge disposal from "end treatment" to "source control". the

3) Combining the enhanced digestion of microorganisms and the enhanced predation of micrometazoans can easily form a food chain, and can achieve a sludge reduction effect of 40%-85% on the remaining sludge without affecting the sewage treatment effect of the primary chemical system. the

4) This process is suitable for the reduction of excess sludge by all activated sludge wastewater biological treatment and its deformation process. It can implement sludge reduction transformation without affecting the normal operation of the sewage plant, saving investment and operation The cost is low, the effect is quick, and the value of promotion and application is high. the

Description of drawings

Fig. 1 is a schematic diagram of the structure of the printing and dyeing wastewater treatment system with low sludge yield;

In the figure, water inlet pump 1, valve 2, flow meter 3, submersible mixer 4, blower 5, anaerobic hydrolysis zone 6, biological selection zone 7, bioenhanced predation aerobic sludge reduction zone 8, secondary settling tank 9, exposure Gas device 10, sludge return pump 11 in sedimentation area, metazoan cultivation dosing tank 12, mud scraper 13, biological filler carrier 14, sludge pipe 15, and water outlet pipe 16.

Detailed ways

As shown in Figure 1, the printing and dyeing wastewater treatment system with low sludge yield includes water inlet pump 1, valve 2, flow meter 3, submersible mixer 4, blower 5, anaerobic hydrolysis zone 6, biological selection zone 7, and bio-enhanced predation well Oxygen sludge reduction area 8, secondary settling tank 9, aeration device 10, sludge return pump 11 in sedimentation area, metazoan cultivation dosing tank 12, mud scraper 13, biological filler carrier 14, sludge pipe 15 and outlet Water pipe 16; the treatment process is divided into biological anaerobic hydrolysis zone 6, biological selection zone 7, bio-enhanced predation aerobic sludge reduction zone 8 and sedimentation zone 9 according to functions; water inlet pump 1, valve 2, flow meter 3 , anaerobic hydrolysis zone 6, biological selection zone 7, bio-enhanced predation and aerobic sludge reduction zone 8 are connected in sequence, anaerobic hydrolysis zone 6 is provided with submersible mixer 4, biological filler carrier 14, and biological selection zone 7 is provided with There is a submersible mixer 4, a biological selection area 7, and an aeration device 10 at the bottom of the bio-enhanced predation aerobic sludge reduction area 8, and the blower 5 is connected to the aeration device 10, and the metazoan cultivation and feeding tank 12 is connected to the bio-enhanced predation well. The oxygen sludge reduction area 8 is connected, the upper part of the bio-enhanced predation aerobic sludge reduction area 8 is connected with the bottom of the secondary sedimentation tank 9, the second sedimentation tank 9 is equipped with a mud scraper 13, and the upper part of the secondary sedimentation tank 9 is equipped with an outlet pipe 16. The bottom of the secondary sedimentation tank 9 is connected to the bottom of the anaerobic hydrolysis zone 6 and the bottom of the biological selection zone 7 through the sludge return pump 11 and the sludge pipe 15 in the sedimentation zone. the

The printing and dyeing wastewater treatment process with low sludge yield is: the printing and dyeing wastewater enters the anaerobic hydrolysis zone 6 through the inlet pump 1, the valve 2 and the flow meter 3, and the anaerobic hydrolysis zone 6 is equipped with a mixer 4 and a biological carrier filler 14, and the mixer 4 To ensure full contact with mud and water, the biological carrier filler 14 is provided with upper and lower layers of brackets, and the biological carrier is filled with fillers between the brackets. The biological carrier filler can increase biomass and intercept sludge to reduce sludge loss. Printing and dyeing wastewater enters through the anaerobic hydrolysis zone 6 The biological selection area 7, the biological selection area 7 mainly prevents sludge bulking, the biological selection area 7 is equipped with a mixer 4 and an aeration system 10, the mixer 4 is to ensure full contact with mud and water, and the aeration system can be used when the water temperature is low. Open to supplement oxygen, the printing and dyeing wastewater enters the bio-enhanced predation aerobic sludge reduction area 8 through the biological selection area 7, and the aeration system 10 is connected to the blower 5 through the pipeline to ensure continuous and efficient oxygen supply, so that the DO in the aerobic area More than 2mg/l; the metazoan cultivation dosing tank 12 regularly adds highly active metazoans to the bio-intensified predation aerobic sludge reduction area 8, and the upper effluent of the bio-intensified predation aerobic sludge reduction area 8 enters the secondary sedimentation The bottom of the zone 9 is discharged from the water outlet pipe 16 after passing through the mud scraper 13. At the same time, the sludge at the bottom of the secondary sedimentation zone 9 is mainly returned to the biological selection zone 7 through the sludge pump 11, and a small amount is returned to the anaerobic hydrolysis zone 6. The excess sludge is treated by the sludge treatment system. the

The biological carrier filler 14 is plastic filler, ceramic filler, fiber filler and polyurethane filler. the

The specific embodiment of the utility model will be described in detail below in conjunction with accompanying drawing:

Example 1

The water quality of a printing and dyeing wastewater is pH: 10~13, CODcr: 800~1200mg/l, NH ₃ -N: 15~30mg/l, TP: 2~6mg/l, water temperature is 35-40℃, water volume is 4000m ³ / d. The sewage treatment process is to adjust neutralization anaerobic hydrolysis-biological selection tank-aerobic tank-SBR tank-effluent, and the effluent after treatment is required to meet the CJ3082-1999 standard of CODcr<500mg/l. The residence time in the anaerobic hydrolysis zone is 7 hours. A submersible mixer is set in the zone to mix the mud and water fully, and a combined filler is set to increase the biomass. The residence time of biological selection pond is 2h, the residence time of aerobic pond is 12h, and the residence time of SBR pond is 6h. Activated sludge method, blast aeration, can improve the oxygenation of the aeration tube, add metazoans in the aerobic zone to strengthen predation, under this condition, the effluent CODcr<200mg/l, the sludge reduction effect can reach more than 80% , has been running stably for four years.

Example 2

The wastewater in a park is mainly water-jet looms, the wastewater quality is pH5-7, CODcr: 100-400mg/l, NH ₃ -N: 10-15mg/l, TP1-3mg/l, the water temperature is normal temperature, and the water volume is 5000m ³ /d, the sewage treatment process is adjustment-air flotation-anaerobic hydrolysis-biological selection tank-aerobic tank-secondary settling tank-sand filter-water outlet, and the outlet water is required to meet the GB18918 Class B standard. The residence time in the anaerobic hydrolysis zone is 8 hours. A submersible mixer is set in the zone to mix the mud and water fully, and a combined filler is set to increase the biomass. The residence time of biological selection pond is 0.5h, and the residence time of aerobic pond is 12.5h. Activated sludge method, blowing aeration, can improve the oxygenation of the aeration tube, and add metazoans to the aerobic zone to strengthen predation. Under this condition, the effluent is better than the GB18918 Class B standard, and the sludge reduction effect reaches 70% % above, greatly reducing the cost of sludge treatment.

Claims (1)

1. A printing and dyeing wastewater treatment system with low sludge yield, characterized in that it includes an inlet pump (1), a valve (2), a flow meter (3), a submersible mixer (4), a blower (5), anaerobic hydrolysis area (6), biological selection area (7), bio-enhanced predation aerobic sludge reduction area (8), secondary sedimentation tank (9), aeration device (10), sludge return pump in sedimentation area (11), Metazoan cultivation dosing tank (12), mud scraper (13), biological filler carrier (14), sludge pipe (15) and outlet pipe (16); water inlet pump (1), valve (2), flow meter (3), the anaerobic hydrolysis area (6), the biological selection area (7), and the bio-enhanced predation aerobic sludge reduction area (8) are connected in sequence, and the anaerobic hydrolysis area (6) is equipped with a submersible mixer (4 ), biological filler carrier (14), a submersible mixer (4) is installed in the biological selection area (7), an aeration device is installed at the bottom of the biological selection area (7), and the bio-enhanced predation aerobic sludge reduction area (8) (10), the blower (5) is connected with the aeration device (10), the metazoan cultivation dosing tank (12) is connected with the bio-enhanced predation aerobic sludge reduction area (8), and the bio-enhanced predation aerobic sludge reduction The upper part of the measuring area (8) is connected with the bottom of the secondary settling tank (9), and the inside of the secondary settling tank (9) is provided with a mud scraper (13), and the upper part of the secondary settling tank (9) is provided with an outlet pipe (16). (9) The bottom is connected to the bottom of the anaerobic hydrolysis zone (6) and the bottom of the biological selection zone (7) through the sludge return pump (11) and the sludge pipe (15) in the sedimentation zone. the

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