CN106365386A - Method and device for deep treating banknote printing wastewater - Google Patents

Abstract

The invention discloses a method and device for deep treating banknote printing wastewater. The device comprises an A<2>/O reacting pool, a sedimentation pool, an ozone contact reaction pool and a biological aeration filtering pool, wherein the A<2>/O reacting pool, the sedimentation pool, the ozone contact reaction pool and the biological aeration filtering pool are sequentially connected. The treating method includes the following steps of 1) treatment in the A<2>/O reacting pool; 2) treatment in the sedimentation pool; 3) treatment in the ozone contact reaction pool; 4) treatment in the biological aeration filtering pool. The device for deep treating banknote printing wastewater has high impacting load resistance, and is good in treatment effect, small in occupied area and low in energy consumption and running and maintenance cost; different pollutants in banknote printing wastewater can be treated through the A<2>/O reacting pool, the sedimentation pool, the ozone contact reaction pool and the biological aeration filtering pool in the device respectively, and the quality of outlet water can meet the strict indexes in the first grade standard in the second period of the Guangdong Province Water Pollutant Emission Limit (DB44/26-2001), and even can meet the IV-class-water standard of the Surface Water Environment Quality Standard (GB3838-2002).

Description

Method and device for advanced treatment of banknote printing wastewater

technical field

The invention relates to a method and device for advanced treatment of banknote printing wastewater, in particular to a combined treatment process method and device of "A ² /O reaction tank + sedimentation tank + ozone contact reaction tank + biological aerated filter tank", which belongs to the industrial Wastewater treatment technology field.

Background technique

Banknote printing wastewater is a type of industrial wastewater with high concentration of organic pollutants produced during the production process of banknote printing industry, including plate wiping waste liquid, banknote printing wastewater, concentrated solution and other related cleaning wastewater. Among them, gravure printing machine plate wiping waste liquid is one of the main waste water of banknote printing factories. According to incomplete statistics, the annual discharge of plate wiping waste liquid in my country is as high as more than 100,000 tons. The composition of plate wiping waste liquid is complex, containing pigments, resin oils, waxes, metal ions, surfactants, organic solvents and other difficult-to-handle chemical substances. It has high COD, high pH and high chroma, and is difficult to handle. If it is simply treated or discharged into nature without treatment, it will cause serious pollution to the natural environment.

Due to the particularity of the banknote printing industry, there are not many domestic technologies for the treatment of industrial wastewater in the banknote printing industry. At present, it mainly includes hydrolysis acidification-contact oxidation, flocculation method, membrane treatment, etc., but there are certain problems. Moreover, due to the different production technologies used by each banknote printing factory, the components of pollutants in the wastewater produced are also different, and there is no general treatment method at present.

The invention discloses a method and device for advanced treatment of banknote printing wastewater. The treatment method is divided into several stages to carry out advanced treatment for different substances in the banknote printing wastewater. "Limit Value" (DB44/26-2001) The stricter indicators in the first-level standard in the second period can even reach the "Surface Water Environmental Quality Standard" (GB3838-2002) Class IV water standard, and the treatment device occupies a small area, Low energy consumption, low operation and maintenance costs.

Contents of the invention

The object of the present invention is to provide a method and device for advanced treatment of banknote printing wastewater.

The technical scheme that the present invention takes is:

An advanced treatment device for banknote printing wastewater, comprising an A2/O reaction tank, a sedimentation tank, an ozone contact reaction tank and an aerated biological filter connected in sequence through pipelines ^; the ^A2 /O reaction tank includes sequentially connected through pipelines Connected anaerobic pond, anoxic pond and aerobic pond; Described anaerobic pond is provided with inlet pipe and first stirring device; Described anoxic pond is provided with second stirring device; Described aerobic pond is provided with first Aeration device and mixed liquid return device, the first aeration device is connected to the first aeration pipe, the mixed liquid return device is connected to the anoxic tank through the mixed liquid return pipe; the sedimentation tank is equipped with a sludge return device and a first The sludge discharge pipe and the sludge return device are connected to the anaerobic tank through the sludge return pipe; the ozone contact reaction tank is equipped with an aeration/ozone dosing device and a second sludge discharge pipe, the aeration/ozone dosing device The gas/ozone pipe is connected; the biological aerated filter is provided with a second aeration device, an air/water backwash pipe, an outlet pipe and biological filler, and the second aeration device is connected with the second aeration pipe.

Both the sedimentation tank and the biological aerated filter are provided with overflow channels.

The sedimentation tank is funnel-shaped.

The advanced treatment of banknote printing wastewater by using the above-mentioned banknote printing wastewater advanced treatment device includes the following steps:

1) A ² /O reaction pool: pass banknote printing wastewater into the anaerobic pool for anaerobic treatment, then pass the effluent from the anaerobic pool into the anoxic pool for anoxic treatment, and then pass the effluent from the anoxic pool into the well Oxygen tank, aeration, aerobic treatment, and partial return of the mixed liquid from the aerobic tank to the anoxic tank;

2) Sedimentation tank: The effluent from the aerobic tank is passed into the sedimentation tank for sedimentation, part of the sludge is returned to the anaerobic tank, and the rest of the sludge is discharged to the outside;

3) Ozone contact reaction tank: pass the effluent from the sedimentation tank into the ozone contact reaction tank, aerate, pass through ozone, convert biodegradable substances into small molecular biodegradable substances, and discharge the generated sludge;

4) Biological aerated filter: pass the effluent of the ozone contact reaction tank into the biological aerated filter, aerate, remove small molecular biodegradable substances, and discharge the treated water to meet the standard, and regularly clean the biological aerated filter The pool is backwashed with air and water.

The hydraulic retention time ratio in the anaerobic pond, anoxic pond and aerobic pond described in step 1) is 1:2:6.

The hydraulic retention time in the described anaerobic tank is 1～1.5h, the dissolved oxygen concentration is 0～0.5mg/L, and the sludge concentration is 3000～5000mg/L; The hydraulic retention time in the described anoxic tank is 2 to 3 hours, the dissolved oxygen concentration is 0.5 to 1.0 mg/L, and the sludge concentration is 3000 to 5000 mg/L; the hydraulic retention time in the aerobic pool is 6 to 9 hours, and the dissolved oxygen concentration is ≥ 2.0 mg/L. The sludge concentration is 5000-6000mg/L.

The reflux ratio of the mixed liquid from the aerobic tank to the anoxic tank in step 1) is 100%-300%.

The hydraulic retention time in the sedimentation tank described in step 2) is 2-4 hours, and the sludge return ratio from the sedimentation tank to the anaerobic tank is 100%-200%.

The hydraulic retention time in the ozone contact reaction tank described in step 3) is 15-45 min, the ozone consumption is 30-50 mg/L, and the pH value in the tank is 6.0-8.0.

The hydraulic retention time in the biological aerated filter described in step 4) is 20-40 minutes, and the dissolved oxygen concentration is ≥ 2.0 mg/L.

The beneficial effects of the present invention are: the banknote printing wastewater advanced treatment device of the present invention has strong impact load resistance, good treatment effect, small footprint of the device, low energy consumption, low operation and maintenance costs, A in the device ² /O reaction tank, sedimentation tank, ozone contact reaction tank and biological aerated filter can respectively carry out advanced treatment for different pollutants in banknote printing wastewater, and the effluent water quality can reach the "Guangdong Province Water Pollutant Discharge Limit" (DB44 /26-2001) The stricter indicators in the first-level standard in the second period can even reach the IV water standard of the "Environmental Quality Standards for Surface Water" (GB3838-2002).

1) The A ² /O reaction pool can effectively remove biodegradable substances in wastewater, reduce the processing load of subsequent processes, have short hydraulic retention time, small pool volume, low investment and construction costs, and no need to supply A ² /O Additional carbon sources and fillers are added to any single tank in the reaction tank, with low operating costs and convenient maintenance and management;

2) The sedimentation tank can meet the water intake requirements of the ozone contact reaction tank only through sedimentation, and the energy consumption is low. Through the sludge backflow, the sludge concentration in the A ² /O reaction tank can be effectively controlled. Through regular sludge discharge, It can remove some refractory substances;

3) The ozone contact reaction tank can convert the refractory biodegradable substances in the wastewater into small molecular biodegradable substances, which improves the subsequent biological treatment effect, low ozone dosage, low operating costs, short residence time, small pool volume, and low investment. The construction cost is low, there is no need to add catalytic fillers, and there are no problems such as catalytic filler failure and blockage. After the ozone reaction is converted into oxygen, it can be supplied to aerobic pools and biological aerated filters. It can not only increase the dissolved oxygen content in water, but also It can reduce the amount of aeration air supply, thereby saving energy consumption and reducing operating costs;

4) The biological aerated filter can remove small molecular biodegradable substances, the residence time is short, the pool volume is small, the investment and construction cost is low, the treatment effect is obviously better than the physical adsorption treatment, and the biofilm on the filler is used to treat sewage, almost without Replace packing, low aeration, low energy consumption, low operating costs.

Description of drawings

Fig. 1 is a process flow chart of the advanced treatment method for banknote printing wastewater of the present invention.

Fig. 2 is a schematic structural view of the banknote printing wastewater advanced treatment device of the present invention.

Fig. 3 is a cross-sectional view of A-A in Fig. 2 .

Fig. 4 is a B-B sectional view in Fig. 2 .

Description of drawings: 1. Anaerobic tank; 11. Water inlet pipe; 12. Stirring device; 2. Anoxic tank; 21. Stirring device; 3. Aerobic tank; 31. Aeration device; 32. Mixed liquid reflux device ; 33, aeration pipe; 34, mixed liquid return pipe; 4, sedimentation tank; 41, sludge return device; 42, sludge discharge pipe; 43, sludge return pipe; 44, overflow channel; 5, ozone contact reaction Pool; 51. Aeration/ozone dosing device; 52. Mud discharge pipe; 53. Aeration/ozone pipe; 6. Biological aerated filter; 61. Aeration device; 62. Air/water backwash pipe; 63 , outlet pipe; 64, biological filler; 65, aeration pipe; 66, overflow channel.

detailed description

As shown in Figure 2, Figure 3 and Figure 4: a banknote printing wastewater advanced treatment device, including A ² /O reaction tank, sedimentation tank 4, ozone contact reaction tank 5 and biological aerated filter connected in sequence through pipelines 6. The A2/O reaction tank includes an anaerobic tank 1, an anoxic tank ² and an aerobic tank 3 connected in sequence through pipelines; the anaerobic tank 1 is provided with a water inlet pipe 11 and a first stirring device 12; The anoxic tank 2 is provided with a second stirring device 21; the aerobic tank 3 is provided with a first aeration device 31 and a mixed liquid reflux device 32, and the first aeration device 31 is connected with the first aeration pipe 33, The mixed liquid return device 32 is connected with the anoxic tank 2 through the mixed liquid return pipe 34 ; The anaerobic tank 1 is connected; the ozone contact reaction tank 5 is provided with an aeration/ozone dosing device 51 and a second mud discharge pipe 52, and the aeration/ozone dosing device 51 is connected with the aeration/ozone pipe 53; the described The biological aerated filter 6 is provided with a second aeration device 61 , an air/water backwash pipe 62 , an outlet pipe 63 and a biological filler 64 , and the second aeration device 61 is connected to a second aeration pipe 65 .

Preferably, the sedimentation tank 4 is provided with a first overflow channel 44 .

Preferably, the biological aerated filter 6 is provided with a second overflow channel 66 .

Preferably, the sedimentation tank 4 is funnel-shaped.

Preferably, the biological filler 64 is ceramsite filler.

Preferably, the ceramsite filler has a particle size of 4-6mm, has micro-holes inside and on the surface, and has a microbial film on the surface.

The advanced treatment of banknote printing wastewater by using the above-mentioned banknote printing wastewater advanced treatment device includes the following steps:

1) A ² /O reaction pool: pass banknote printing wastewater into the anaerobic pool for anaerobic treatment, then pass the effluent from the anaerobic pool into the anoxic pool for anoxic treatment, and then pass the effluent from the anoxic pool into the well Oxygen tank, aeration, aerobic treatment, and partial return of the mixed liquid from the aerobic tank to the anoxic tank;

2) Sedimentation tank: The effluent from the aerobic tank is passed into the sedimentation tank for sedimentation, part of the sludge is returned to the anaerobic tank, and the rest of the sludge is discharged to the outside;

3) Ozone contact reaction tank: pass the effluent from the sedimentation tank into the ozone contact reaction tank, aerate, pass through ozone, convert biodegradable substances into small molecular biodegradable substances, and discharge the generated sludge;

4) Biological aerated filter: pass the effluent of the ozone contact reaction tank into the biological aerated filter, aerate, remove small molecular biodegradable substances, and discharge the treated water to meet the standard, and regularly clean the biological aerated filter The pool is backwashed with air and water.

Preferably, the hydraulic retention time ratio in the anaerobic pond, anoxic pond and aerobic pond described in step 1) is 1:2:6.

Preferably, the hydraulic retention time in the anaerobic tank is 1-1.5 h, the dissolved oxygen concentration is 0-0.5 mg/L, and the sludge concentration is 3000-5000 mg/L.

Preferably, the hydraulic retention time in the anoxic tank is 2-3 hours, the dissolved oxygen concentration is 0.5-1.0 mg/L, and the sludge concentration is 3000-5000 mg/L.

Preferably, the hydraulic retention time in the aerobic tank is 6-9 hours, the dissolved oxygen concentration is ≥2.0 mg/L, and the sludge concentration is 5000-6000 mg/L.

Preferably, the reflux ratio of the mixed liquid from the aerobic tank to the anoxic tank in step 1) is 100%-300%.

Preferably, the hydraulic retention time in the sedimentation tank described in step 2) is 2-4 hours, and the sludge return ratio from the sedimentation tank to the anaerobic tank is 100%-200%.

Preferably, the hydraulic retention time in the ozone contact reaction tank described in step 3) is 15-45 min, the ozone consumption is 30-50 mg/L, and the pH value in the tank is 6.0-8.0.

Preferably, the hydraulic retention time in the biological aerated filter described in step 4) is 20-40 minutes, and the dissolved oxygen concentration is ≥ 2.0 mg/L.

Preferably, in step 4), the air flushing intensity for air backwashing is 2-4 L/m ² s, the water flushing intensity for water backwashing is 2-4 L/m ² s, the flushing time is 10-20 minutes, and the flushing period is ≤ 7 days.

Preferably, the A ² /O reaction tank, the sedimentation tank, the ozone contact reaction tank and the biological aerated filter all operate at a temperature of 5-40°C.

The present invention will be further explained and illustrated below in conjunction with specific embodiments.

Example:

The comprehensive wastewater (mixture of papermaking white water, ink wastewater, plate wiping waste, etc.) from a banknote printing factory in Sichuan was selected. After pretreatment in the original inclined tube sedimentation tank in the factory area, the process flow chart shown in Figure 1 was used to adopt this method. The method and device of the invention are used for treatment, the water temperature is 25°C, and the sewage treatment results are shown in Table 1.

Table 1 Sewage Treatment Results

It can be seen from Table 1 that the banknote printing wastewater advanced treatment device of the present invention has good treatment effect, simple treatment method, and can deeply treat different pollutants in the banknote printing wastewater, and the effluent quality can reach the "Guangdong Province Water Pollutant Discharge Limit" (DB44 /26-2001) The stricter indicators in the first-level standard in the second period can even reach the IV water standard of the "Environmental Quality Standards for Surface Water" (GB3838-2002).

The above-mentioned embodiment is a preferred embodiment of the present invention, but the embodiment of the present invention is not limited by the above-mentioned embodiment, and any other changes, modifications, substitutions, combinations, Simplifications should be equivalent replacement methods, and all are included in the protection scope of the present invention.

Claims (10)

1. A banknote printing wastewater advanced treatment device is characterized in that: it comprises an A ² /O reaction tank, a sedimentation tank, an ozone contact reaction tank and a biological aerated filter connected in sequence through pipelines; the A ² /O reaction The pool comprises an anaerobic pool, anoxic pool and an aerobic pool connected in sequence by pipelines; the anaerobic pool is provided with a water inlet pipe and a first stirring device; the anoxic pool is provided with a second stirring device; the good The oxygen tank is equipped with a first aeration device and a mixed liquid return device, the first aeration device is connected with the first aeration pipe, and the mixed liquid return device is connected with the anoxic tank through the mixed liquid return pipe; the sedimentation tank is provided with a sewage The sludge return device and the first sludge discharge pipe, the sludge return device is connected to the anaerobic tank through the sludge return pipe; the ozone contact reaction tank is equipped with an aeration/ozone dosing device and a second sludge discharge pipe, and the aeration/ozone The ozone dosing device is connected with the aeration/ozone pipe; the biological aerated filter is provided with a second aeration device, an air/water backwash pipe, an outlet pipe and biological filler, and the second aeration device is connected with the second aeration tube connection. 2. The advanced treatment device for banknote printing wastewater according to claim 1, characterized in that: both the sedimentation tank and the biological aerated filter are provided with overflow channels. 3. The advanced treatment device for banknote printing wastewater according to claim 1, characterized in that: the sedimentation tank is funnel-shaped. 4. A method for advanced treatment of banknote printing wastewater, characterized in that: comprising the following steps: A ² /O reaction pool: pass banknote printing wastewater into the anaerobic pool for anaerobic treatment, then pass the effluent from the anaerobic pool into the anoxic pool for anoxic treatment, and then pass the effluent from the anoxic pool into the aerobic pool , aeration, aerobic treatment, and partial return of the aerobic tank mixture to the anoxic tank; Sedimentation tank: The effluent from the aerobic tank is passed into the sedimentation tank for sedimentation, part of the sludge is returned to the anaerobic tank, and the rest of the sludge is discharged to the outside; Ozone contact reaction tank: pass the effluent from the sedimentation tank into the ozone contact reaction tank, aerate, pass through ozone, convert biodegradable substances into small molecular biodegradable substances, and discharge the generated sludge to the outside; Biological aerated filter: The effluent from the ozone contact reaction tank is passed into the biological aerated filter for aeration to remove small molecular biodegradable substances, and the treated water is discharged to meet the standard, and the biological aerated filter is regularly tested Air backwash and water backwash. 5. The treatment method according to claim 4, characterized in that: the hydraulic retention time ratio of the anaerobic pond, anoxic pond and aerobic pond in step 1) is 1:2:6. 6. The treatment method according to claim 4 or 5, characterized in that: the hydraulic retention time in the anaerobic tank is 1～1.5h, the dissolved oxygen concentration is 0～0.5mg/L, and the sludge concentration is 3000～5000mg/L; the hydraulic retention time in the anoxic pool is 2～3h, the dissolved oxygen concentration is 0.5～1.0mg/L, and the sludge concentration is 3000～5000mg/L; in the aerobic pool The hydraulic retention time is 6~9h, the dissolved oxygen concentration is ≥2.0mg/L, and the sludge concentration is 5000~6000mg/L. 7. The treatment method according to claim 4, characterized in that: in step 1), the reflux ratio of the mixed liquid from the aerobic tank to the anoxic tank is 100%-300%. 8. The treatment method according to claim 4, characterized in that: the hydraulic retention time in the sedimentation tank described in step 2) is 2 to 4 hours, and the sludge return ratio from the sedimentation tank to the anaerobic tank is 100% ~200%. 9. The treatment method according to claim 4, characterized in that: the hydraulic retention time in the ozone contact reaction tank described in step 3) is 15-45 minutes, the amount of ozone is 30-50 mg/L, and the pH value in the tank is 6.0 to 8.0. 10. The treatment method according to claim 4, characterized in that: the hydraulic retention time in the biological aerated filter in step 4) is 20-40 minutes, and the dissolved oxygen concentration is ≥ 2.0 mg/L.