CN105174637A - Pretreatment process for papermaking tail water recycling and zero discharge - Google Patents
Pretreatment process for papermaking tail water recycling and zero discharge Download PDFInfo
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- CN105174637A CN105174637A CN201510636996.XA CN201510636996A CN105174637A CN 105174637 A CN105174637 A CN 105174637A CN 201510636996 A CN201510636996 A CN 201510636996A CN 105174637 A CN105174637 A CN 105174637A
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Abstract
The invention relates to a pretreatment process for papermaking tail water recycling and zero discharge. Up-to-standard discharged papermaking tail water, a homogenization basin, a mechanically accelerated classification basin, a primary quick filtration basin, a primary quick filtration water production basin, an ozone contact oxidization basin, an aerated biological activated carbon filtration basin, a secondary quick filtration basin, a membrane integration treatment system raw water basin, a backwashing fan, an ozone generator, an aeration fan, a backwashing water supplying basin, a backwashing sewage collection basin, a sewage concentration basin, a sewage dehydrating work section and the like are adopted in the process. With flocculation classification, two-stage filtration, ozone contact oxidization and biological activated carbon adsorption and degradation as core techniques, the turbidity and the hardness of the papermaking tail water as well as the content of organic matters, suspending solids and gel impurities in the papermaking tail water are substantially reduced after the papermaking tail water is treated with the pretreatment process, pollution loads of a treatment process of a following membrane integration treatment system are reduced, accordingly, normal operation of the membrane integration treatment system is guaranteed, and necessary conditions are created for recycling and zero-discharging of the papermaking wastewater.
Description
Technical field
The invention belongs to environmental engineering, water pollution control and energy-conserving and emission-cutting technology, particularly paper making tail water reuse and zero release pretreatment technology.
Background technology
Paper industry not only needs a large amount of fresh water, and can produce a large amount of high density, difficult degradation sewage.According to Environment Protect in China portion investigation statistics, Chinese papermaking and paper product industry amount to waste discharge 28.5 hundred million tons in 2013, account for 14.9% of national discharged volume of industrial waste water, rank the first in 41 industrial trades of investigation statistics.In the waste water of papermaking and the discharge of paper product industry, chemical oxygen demand (COD) (COD) total amount is 53.3 ten thousand tons, accounts for 18.7% of national industrial COD total release, ranks the first in 41 industrial trades of investigation statistics.
The improvement of paper industry sewage is the technology of field of water pollution control primary study solution in the world always.The papermaking enterprise of China generally all establishes mthod of white water from paper making cyclically utilizing facility to reduce the quantity discharged of mthod of white water from paper making in workshop, the trial of Treated sewage reusing and zero release that also had some enterprises to do.Treated sewage reusing and zero release mean the recycle of water resources and the control completely of water pollutions, also mean the recovery of material and resource, are important technologies embodying cleaner production, recycling economy and Sustainable development.
Paper industry sewage, after a series of materialization, biochemistry and advanced treatment, reaches the be referred to as paper making tail water of GB3554-2008 " pulp and paper industry pollution discharge standard ".Paper making tail water is by after pre-treatment and the process of film integrated system, and its water quality can meet GBT19923-2005 " urban sewage reutilization water quality standard for industries ", can be used as Treated sewage reusing and adds to industrial each and save with water ring.This significantly reduces paper making tail water and discharges the pressure caused environment, meets the thought of social sustainable development, water resources recycle, achieves Treated sewage reusing and the zero release of real meaning.
In the process of system process paper making tail water, if do not carried out pre-treatment, directly being sent into the process of film integrated system, then easily being caused the colloid pollution of membranous system element, biological pollution and Organic pollutants, shortened the work-ing life of film.Meanwhile, the indissoluble salt in paper making tail water is easy to produce incrustation scale, is deposited on film surface, the operational efficiency of membranous system also can be caused to reduce after incrustation scale is concentrated.The problems referred to above, will directly have influence on the implementation result of paper making tail water Treated sewage reusing and Zero-discharge treating process, cause being difficult to provide the water quality meeting industrial process waters and require, also just do not reach the object of paper making tail water recycle, zero release.
Summary of the invention
Main purpose of the present invention is to provide a kind of paper making tail water recover zero discharge pretreatment technology, the content of the turbidity in paper making tail water after treatment, hardness, organism, suspended solids and colloidal impurity is all significantly reduced, meets the requirement of film processing system influent quality.
Technical scheme of the present invention:
Paper making tail water reuse and zero release pretreatment technology, comprise following processing step:
(1) homogeneous pond process: the qualified discharge paper making tail water meeting GB3554-2008 " pulp and paper industry pollution discharge standard " is after treatment delivered to homogeneous pond by pipe network, the water retention time in homogeneous pond is 3 ~ 4 hours, is then pumped to mechanical accelerating purifying pool.
(2) mechanical accelerating purifying pool process: the total residence time of water mechanical accelerating purifying pool is out 1.2 ~ 1.5h from homogeneous pond, and the liquid level load of clear water zone is 2.9 ~ 3.6m
3/ m
2h; First in mechanical accelerating purifying pool water inlet pipe, add flocculation agent PAC, NaOH and Na
2cO
3, then coagulant aids PAM is added in reactive center cylinder.The overflow of mechanical accelerating purifying pool supernatant liquor is to annular collecting vat, and water outlet gravity flow enters one-level rapid filter.
(3) one-level rapid filter process: using the quartz sand of different-grain diameter grating as filtration medium, the normal rate filtering of one-level rapid filter is 7 ~ 9m/h, and forcing filter rate is 9 ~ 12m/h; Adopt Liquid level backwash process, independent air blasting intensity is 15 ~ 20L/m
2s, time 2min; It is 8 ~ 10L/m that independent water rushes intensity
2s, time 6min; Filtration cycle 12 ~ 24h.The water outlet gravity flow of one-level rapid filter enters one-level and filters product pond soon; Promote through pump again and deliver to O3 contacted oxidation pond.
(4) O3 contacted oxidation pond process: pond, O3 contacted oxidation pond base fabric is equipped with the ozonation aerated dish of many groups, and the hydraulic detention time 0.6 ~ 1/h in O3 contacted oxidation pond, ozone dosage is 30 ~ 40mg/L about, is provided by ozonizer.The water outlet gravity flow of O3 contacted oxidation pond enters aerated biological activated carbon filter tank.
(5) aerated biological activated carbon filter process: the volumetric loading in aerated biological activated carbon filter tank is 0.2 ~ 0.4kgBOD
5/ m
3d, provides the oxygen needed for microbial activities by Aeration fan; Adopt constant water level filtering mode, normal rate filtering is 3.5 ~ 4.5m/h, and forcing filter rate is 5 ~ 6m/h; Adopt gas-water associating back flushing, the air purge time is 3 ~ 5min, and air water associating flush time is 4 ~ 6min, and the independent water rinse time is 8 ~ 10min, and air scour intensity is 12 ~ 16L/m
2s, water backwash rate is 4 ~ 6L/m
2s.The water outlet gravity flow of aerated biological activated carbon filter tank enters secondary rapid filter.
(6) secondary rapid filter process: using the quartz sand of different-grain diameter grating as filtration medium, the normal rate filtering of secondary rapid filter is 7 ~ 9m/h, and forcing filter rate is 9 ~ 12m/h; Adopt Liquid level backwash process, independent air blasting intensity is 15 ~ 20L/m
2s, time 2min; It is 8 ~ 10L/m that independent water rushes intensity
2s, time 6min; Filtration cycle is 12 ~ 24h.Secondary rapid filter water outlet gravity flow enters the former pond of film Integrated Processing System.
(7) film Integrated Processing System former pond process: paper making tail water is 1 ~ 1.5h in the residence time in the former pond of film Integrated Processing System, is pumped to film Integrated Processing System after pressurization.
(8) backwashing system process: the backwash gas of I and II rapid filter and aerated biological activated carbon filter is provided by backwash blower fan, anti-scouring water is provided after water pump pressurizes by back flushing water supply pool inner water.Sewer after backwash enters backwashing sewage water collecting tank after collecting by the road, by pumped back homogeneous pond.
(9) mud collection and treatment: mechanical accelerating purifying pool mud is collected through bucket, then be delivered to sludge thickener by shore pipe and do further thickening, the solids flux of sludge thickener is 1 ~ 3kg/m
2h; Mud after concentrated, through sludge pumping to sludge dewatering workshop section, the dewatered sludge water ratio after dehydration is 30% ~ 40%, then carries out burning or the disposal such as landfill.
(10) wastewater collection process: the filtrate that the supernatant liquor of sludge thickener and sludge dewatering workshop section produce delivers to homogeneous pond after collecting by the road, enters follow-up sewage disposal link.
Beneficial effect of the present invention: the present invention for core technology, carries out recover zero discharge pre-treatment to paper making tail water with " flocculate and clarify+two-stage filtration+O3 contacted oxidation+biological activated carbon absorption degradation ".Through pretreatment technology process, the content of the turbidity in paper making tail water, hardness, organism, suspended solids and colloidal impurity is also significantly reduced, and meets the requirement of film processing system influent quality.Which reduce the pollution load of subsequent film integrated system treatment process, reduce the pollution of membrane element, decrease the number of times of film Integrated Processing System cleaning, thus ensure that the normal operation of film Integrated Processing System, for realizing paper making tail water reuse and zero release creates necessary condition.
Accompanying drawing explanation
Fig. 1: paper making tail water reuse and zero release pretreatment technology figure.
In figure: 1-homogeneous pond, 2-mechanical accelerating purifying pool, 3-one-level rapid filter, 4-one-level is filtered soon and is produced pond, 5-O3 contacted oxidation pond, 6-aerated biological activated carbon filter tank, 7-secondary rapid filter, the former pond of 8-film Integrated Processing System,
9-backwash blower fan, 10-ozonizer, 11-Aeration fan, 12-back flushing feed cistern, 13-backwashing sewage water collecting tank, 14-sludge thickener, 15-sludge dewatering workshop section.
Embodiment
Below in conjunction with accompanying drawing technical process, content of the present invention is described further.
(1) homogeneous pond 1 processes: will after treatment, the qualified discharge paper making tail water meeting GB3554-2008 " pulp and paper industry pollution discharge standard " is delivered to homogeneous pond 1 by pipe network, the water retention time in homogeneous pond 1 is 3 ~ 4h, is then pumped to mechanical accelerating purifying pool 2.
(2) mechanical accelerating purifying pool 2 processes: water outlet total residence time in this pond in homogeneous pond 1 is 1.2 ~ 1.5 hours, and the liquid level load of clear water zone is 2.9 ~ 3.6m
3/ m
2h.In order to remove hardness and suspended matter, first in mechanical accelerating purifying pool 2 water inlet pipe, add flocculation agent PAC, NaOH and Na
2cO
3; Coagulant aids PAM is added again in reactive center cylinder.NaOH, Na
2cO
3with the Ca in waste water
2+, Mg
2+in the given area of settling pond, there is chemical reaction, generate the throw out of insoluble, then with PAC, PAM flocculate roll into a ball together with sink to mud district.The overflow of mechanical accelerating purifying pool 2 supernatant liquor is to annular collecting vat, and water outlet gravity flow enters one-level rapid filter 3.
(3) one-level rapid filter 3 processes: using the quartz sand of different-grain diameter grating as filtration medium, and the normal rate filtering of one-level rapid filter 3 is 7 ~ 9m/h, and forcing filter rate is 9 ~ 12m/h, and adopt Liquid level backwash process, independent air blasting intensity is 15 ~ 20L/m
2s, time 2min; It is 8 ~ 10L/m that independent water rushes intensity
2s, time 6min; Filtration cycle 12 ~ 24h.The water outlet gravity flow of one-level rapid filter 3 enters one-level and filters product pond 4 soon; Promote through pump again and deliver to O3 contacted oxidation pond 5.
(4) O3 contacted oxidation pond 5 processes: pond, O3 contacted oxidation pond 5 base fabric is equipped with the ozonation aerated dish of many groups, nearly 0.6 ~ the 1h of hydraulic detention time in O3 contacted oxidation pond 5, ozone dosage is 30 ~ 40mg/L about, thered is provided by ozonizer 10, water outlet gravity flow in O3 contacted oxidation pond 5 enters aerated biological activated carbon filter tank 6.
(5) aerated biological activated carbon filter tank 6 processes: the volumetric loading in aerated biological activated carbon filter tank 6 is 0.2 ~ 0.4kgBOD
5/ m
3d, provides the oxygen needed for microbial activities by Aeration fan 11; Adopt constant water level filtering mode, normal rate filtering is 3.5 ~ 4.5m/h, and forcing filter rate is 5 ~ 6m/h; Adopt gas-water associating back flushing, the air purge time is 3 ~ 5min, and air water associating flush time is 4 ~ 6min, and the independent water rinse time is 8 ~ 10min, and air scour intensity is 12 ~ 16L/m
2s, water backwash rate is 4 ~ 6L/m
2s.Aerated biological activated carbon filter tank 6 water outlet gravity flow enters secondary rapid filter.
(6) secondary rapid filter 7 processes: using the quartz sand of different-grain diameter grating as filtration medium, and the normal rate filtering of secondary rapid filter 7 is 7 ~ 9m/h, and forcing filter rate is 9 ~ 12m/h, and adopt Liquid level backwash process, independent air blasting intensity is 15 ~ 20L/m
2s, time 2min; It is 8 ~ 10L/m that independent water rushes intensity
2s, time 6min; Filtration cycle 12 ~ 24h.Secondary rapid filter 7 water outlet gravity flow enters the former pond 8 of film Integrated Processing System.
(7) the former pond of film Integrated Processing System 8 processes: paper making tail water is 1 ~ 1.5h in the residence time in the former pond 8 of film Integrated Processing System, after pressurization, be pumped to film Integrated Processing System.
(8) backwashing system process: the backwash gas of one-level rapid filter 3, secondary rapid filter 7 and aerated biological activated carbon filter 6 is provided by backwash blower fan 9, anti-scouring water is provided after water pump pressurizes by water in back flushing feed cistern 12.The parameter of back-washing equipment is respectively by determining with water, gas consumption during aforementioned back flushing.
Sewer after one-level rapid filter 3, secondary rapid filter 7 and aerated biological activated carbon filter tank 6 back flushing enters backwashing sewage water collecting tank 13 after collecting by the road, by pumped back homogeneous pond 1.
(9) mud collection and treatment: mechanical accelerating purifying pool 2 mud is collected through bucket, then be delivered to sludge thickener 14 by shore pipe and do further thickening, the solids flux of sludge thickener 14 is 1 ~ 3kg/m
2h; Mud after concentrated, through sludge pumping to sludge dewatering workshop section 15, the dewatered sludge water ratio after dehydration is 30% ~ 40%, then carries out burning or the disposal such as landfill.
(10) wastewater collection process: the filtrate that the supernatant liquor of sludge thickener 14 and sludge dewatering workshop section 15 produce delivers to homogeneous pond 1 after collecting by the road, enters follow-up sewage disposal link.
Embodiment 1
(1) homogeneous pond process: paper making tail water is delivered to homogeneous pond by pipe network, and the water retention time in homogeneous pond is 4h, is then pumped to mechanical accelerating purifying pool.Paper making tail water water quality is: CODcr=25.4 ~ 26.0mg/L, total dissolved solid content TDS=659 ~ 740mg/L, turbidity NTU=3.06 ~ 3.22, and hardness is 236 ~ 272mg/L, chloride ion content Cl
-=176 ~ 185mg/L, sulfate ion content SO
4 2-=149 ~ 220mg/L.
(2) mechanical accelerating purifying pool process: the total residence time of homogeneous pond water outlet in this pond is 1.5h, the liquid level load of clear water zone is 3.2m
3/ m
2h.In order to remove hardness and suspended matter, first in mechanical accelerating purifying pool water inlet pipe, add flocculation agent PAC, NaOH and Na
2cO
3; Coagulant aids PAM is added again in reactive center cylinder.NaOH, Na
2cO
3with the Ca in waste water
2+, Mg
2+in the given area of settling pond, there is chemical reaction, generate the throw out of insoluble, then with PAC, PAM flocculate roll into a ball together with sink to mud district.The overflow of mechanical accelerating purifying pool supernatant liquor is to annular collecting vat, and water outlet gravity flow enters one-level rapid filter.
(3) one-level rapid filter process: using the quartz sand of different-grain diameter grating as filtration medium, the normal rate filtering of one-level rapid filter is 8m/h, and forcing filter rate is 10m/h, and adopt Liquid level backwash process, independent air blasting intensity is 16L/m
2s, time 2min; It is 8L/m that independent water rushes intensity
2s, time 6min; Filtration cycle 24h.The water outlet gravity flow of one-level rapid filter enters one-level and filters product pond soon, then delivers to O3 contacted oxidation pond through pump lifting.
(4) O3 contacted oxidation pond process: pond, O3 contacted oxidation pond base fabric is equipped with the ozonation aerated dish of many groups, the nearly 0.8h of hydraulic detention time in O3 contacted oxidation pond, ozone dosage is about 32mg/L, thered is provided by ozonizer, water outlet gravity flow in O3 contacted oxidation pond enters aerated biological activated carbon filter tank.
(5) aerated biological activated carbon filter tank process: the volumetric loading in aerated biological activated carbon filter tank is 0.25kgBOD
5/ m
3d, provides the oxygen needed for microbial activities by Aeration fan; Adopt constant water level filtering mode, normal rate filtering is 4m/h, and forcing filter rate is 5m/h; Adopt gas-water associating back flushing, the air purge time is 5min, and air water associating flush time is 5min, and the independent water rinse time is 8min, and air scour intensity is 13L/m
2s, water backwash rate is preferably 6L/m
2s.The water outlet gravity flow of aerated biological activated carbon filter tank enters secondary rapid filter.
(6) secondary rapid filter process: using the quartz sand of different-grain diameter grating as filtration medium, the normal rate filtering of secondary rapid filter is 8m/h, and forcing filter rate is 10m/h, and adopt Liquid level backwash process, independent air blasting intensity is 16L/m
2s, time 2min; It is 10L/m that independent water rushes intensity
2s, time 6min; Filtration cycle 24h.Secondary rapid filter water outlet gravity flow enters the former pond of film Integrated Processing System.
(7) film Integrated Processing System former pond process: the water quality in former pond is CODcr=5.2 ~ 5.4mg/L, TDS=580 ~ 660mg/L, turbidity NTU=0.21 ~ 0.24, and hardness is 160 ~ 200mg/L, chloride ion content Cl
-=114 ~ 120mg/L, sulfate ion content SO
4 2-=128 ~ 200mg/L, this water quality meets the influent quality requirement of film Integrated Processing System.Paper making tail water is 1h in the residence time in the former pond of film Integrated Processing System, after pressurization, be pumped to film Integrated Processing System.Pretreated paper making tail water delivers to film Integrated Processing System through force (forcing) pump.
(8) backwashing system: the backwash gas of I and II rapid filter and aerated biological activated carbon filter is provided by backwash blower fan, anti-scouring water is provided after water pump pressurizes by back flushing water supply pool inner water.The parameter of back-washing equipment is respectively by determining with water, gas consumption during aforementioned back flushing.Sewer after I and II rapid filter and aerated biological activated carbon filter back washing enters backwashing sewage water collecting tank, by pumped back homogeneous pond after collecting by the road.
(9) mud collection and treatment: mechanical accelerating purifying pool mud is collected through bucket, then be delivered to sludge thickener by shore pipe and do further thickening, the solids flux of sludge thickener is 1.8kg/m
2h; Mud after concentrated, through sludge pumping to sludge dewatering workshop section, the dewatered sludge water ratio after dehydration is 30% ~ 40%, then carries out burning or the disposal such as landfill.
(10) wastewater collection process: the filtrate that the supernatant liquor of sludge thickener and sludge dewatering workshop section produce delivers to homogeneous pond after collecting by the road, enters follow-up sewage disposal link.
Embodiment 2
(1) homogeneous pond process: paper making tail water is delivered to homogeneous pond by pipe network, and the water retention time in homogeneous pond is 4 hours, is then pumped to mechanical accelerating purifying pool.Paper making tail water water quality is: CODcr=26.8 ~ 28.9mg/L, total dissolved solid content TDS=708 ~ 732mg/L, turbidity NTU=3.12 ~ 3.46, hardness=268 ~ 282mg/L, chloride ion content Cl
-=180 ~ 197mg/L, sulfate ion content SO
4 2-=193 ~ 240mg/L.
(2) mechanical accelerating purifying pool process: the total residence time of homogeneous pond water outlet in this pond is 1.5 hours, the liquid level load of clear water zone is 3.2m
3/ m
2h.In order to remove hardness and suspended matter, first in mechanical accelerating purifying pool water inlet pipe, add flocculation agent PAC, NaOH and Na
2cO
3; Coagulant aids PAM is added again in reactive center cylinder.NaOH, Na
2cO
3with the Ca in waste water
2+, Mg
2+in the given area of settling pond, there is chemical reaction, generate the throw out of insoluble, then with PAC, PAM flocculate roll into a ball together with sink to mud district.The overflow of mechanical accelerating purifying pool supernatant liquor is to annular collecting vat, and water outlet gravity flow enters one-level rapid filter.
(3) one-level rapid filter process: using the quartz sand of different-grain diameter grating as filtration medium, the normal rate filtering of one-level rapid filter is 8m/h, and forcing filter rate is 10m/h, and adopt Liquid level backwash process, independent air blasting intensity is 16L/m
2s, time 2min; It is 8L/m that independent water rushes intensity
2s, time 6min; Filtration cycle 24h.The water outlet gravity flow of one-level rapid filter enters one-level and filters product pond soon, then delivers to O3 contacted oxidation pond through pump lifting.
(4) O3 contacted oxidation pond process: pond, O3 contacted oxidation pond base fabric is equipped with the ozonation aerated dish of many groups, the nearly 0.8h of hydraulic detention time in O3 contacted oxidation pond, ozone dosage is about 34mg/L, thered is provided by ozonizer, water outlet gravity flow in O3 contacted oxidation pond enters aerated biological activated carbon filter tank.
(5) aerated biological activated carbon filter tank process: the volumetric loading in aerated biological activated carbon filter tank is 0.27kgBOD
5/ m
3d, provides the oxygen needed for microbial activities by Aeration fan; Adopt constant water level filtering mode, normal rate filtering is 4m/h, and forcing filter rate is 5m/h; Adopt gas-water associating back flushing, the air purge time is 5min, and air water associating flush time is 5min, and the independent water rinse time is 8min, and air scour intensity is 13L/m
2s, water backwash rate is preferably 6L/m
2s.The water outlet gravity flow of aerated biological activated carbon filter tank enters secondary rapid filter.
(6) secondary rapid filter process: using the quartz sand of different-grain diameter grating as filtration medium, the normal rate filtering of secondary rapid filter is 8m/h, and forcing filter rate is 10m/h, and adopt Liquid level backwash process, independent air blasting intensity is 16L/m
2s, time 2min; It is 10L/m that independent water rushes intensity
2s, time 6min; Filtration cycle 24h.Secondary rapid filter water outlet gravity flow enters the former pond of film Integrated Processing System.
(7) film Integrated Processing System former pond process: the water quality in former pond is CODcr=6.3 ~ 6.8mg/L, TDS=610 ~ 680mg/L, turbidity NTU=0.24 ~ 0.45, and hardness is 183 ~ 225mg/L, chloride ion content Cl
-=117 ~ 125mg/L, sulfate ion content SO
4 2-=132 ~ 205mg/L.Paper making tail water is 1h in the residence time in the former pond of film Integrated Processing System, after pressurization, be pumped to film Integrated Processing System.Pretreated paper making tail water delivers to film Integrated Processing System through force (forcing) pump.
(8) backwashing system: the backwash gas of I and II rapid filter and aerated biological activated carbon filter is provided by backwash blower fan, anti-scouring water is provided after water pump pressurizes by back flushing water supply pool inner water.The parameter of back-washing equipment is respectively by determining with water, gas consumption during aforementioned back flushing.Sewer after I and II rapid filter and aerated biological activated carbon filter back washing enters backwashing sewage water collecting tank, by pumped back homogeneous pond after collecting by the road.
(9) mud collection and treatment: mechanical accelerating purifying pool mud is collected through bucket, then be delivered to sludge thickener by shore pipe and do further thickening, the solids flux of sludge thickener is 1.8kg/m
2h; Mud after concentrated, through sludge pumping to sludge dewatering workshop section, the dewatered sludge water ratio after dehydration is 30% ~ 40%, then carries out burning or the disposal such as landfill.
(10) wastewater collection process: the filtrate that the supernatant liquor of sludge thickener and sludge dewatering workshop section produce delivers to homogeneous pond after collecting by the road, enters follow-up sewage disposal link.
Embodiment 3
(1) homogeneous pond process: paper making tail water is delivered to homogeneous pond by pipe network, and the water retention time in homogeneous pond is 4 hours, is then pumped to mechanical accelerating purifying pool.Paper making tail water water quality is: CODcr=27.6 ~ 33.2mg/L, total dissolved solid content TDS=769 ~ 827mg/L, turbidity NTU=3.20 ~ 3.88, hardness=272 ~ 284mg/L, chloride ion content Cl
-=182 ~ 199mg/L, sulfate ion content SO
4 2-=204 ~ 283mg/L.
(2) mechanical accelerating purifying pool process: the total residence time of homogeneous pond water outlet in this pond is 1.5h, the liquid level load of clear water zone is 3.2m
3/ m
2h.In order to remove hardness and suspended matter, first in mechanical accelerating purifying pool water inlet pipe, add flocculation agent PAC, NaOH and Na
2cO
3; Coagulant aids PAM is added again in reactive center cylinder.NaOH, Na
2cO
3with the Ca in waste water
2+, Mg
2+in the given area of settling pond, there is chemical reaction, generate the throw out of insoluble, then with PAC, PAM flocculate roll into a ball together with sink to mud district.The overflow of mechanical accelerating purifying pool supernatant liquor is to annular collecting vat, and water outlet gravity flow enters one-level rapid filter.
(3) one-level rapid filter process: using the quartz sand of different-grain diameter grating as filtration medium, the normal rate filtering of one-level rapid filter is 8m/h, and forcing filter rate is 10m/h, and adopt Liquid level backwash process, independent air blasting intensity is 18L/m
2s, time 2min; It is 10L/m that independent water rushes intensity
2s, time 6min; Filtration cycle 24h.The water outlet gravity flow of one-level rapid filter enters one-level and filters product pond soon, then delivers to O3 contacted oxidation pond through pump lifting.
(4) O3 contacted oxidation pond process: pond, O3 contacted oxidation pond base fabric is equipped with the ozonation aerated dish of many groups, the nearly 0.8h of hydraulic detention time in O3 contacted oxidation pond, ozone dosage is about 32mg/L, thered is provided by ozonizer, water outlet gravity flow in O3 contacted oxidation pond enters aerated biological activated carbon filter tank.
(5) aerated biological activated carbon filter tank process: the volumetric loading in aerated biological activated carbon filter tank is 0.31kgBOD
5/ m
3d, provides the oxygen needed for microbial activities by Aeration fan; Adopt constant water level filtering mode, normal rate filtering is 4m/h, and forcing filter rate is 5m/h; Adopt gas-water associating back flushing, the air purge time is 5min, and air water associating flush time is 5min, and the independent water rinse time is 8min, and air scour intensity is 13L/m
2s, water backwash rate is preferably 6L/m
2s.The water outlet gravity flow of aerated biological activated carbon filter tank enters secondary rapid filter.
(6) secondary rapid filter process: using the quartz sand of different-grain diameter grating as filtration medium, the normal rate filtering of secondary rapid filter is 8m/h, and forcing filter rate is 10m/h, and adopt Liquid level backwash process, independent air blasting intensity is 16L/m
2s, time 2min; It is 10L/m that independent water rushes intensity
2s, time 6min; Filtration cycle 24h.Secondary rapid filter water outlet gravity flow enters the former pond of film Integrated Processing System.
(7) film Integrated Processing System former pond process: the water quality in former pond is CODcr=6.7 ~ 8.7mg/L, TDS=610 ~ 680mg/L, turbidity NTU=0.38 ~ 0.55, and hardness is 198 ~ 236mg/L, chloride ion content Cl
-=121 ~ 127mg/L, sulfate ion content SO
4 2-=135 ~ 215mg/L, this water quality meets the influent quality requirement of film Integrated Processing System.Paper making tail water is 1h in the residence time in the former pond of film Integrated Processing System, after pressurization, be pumped to film Integrated Processing System.Pretreated paper making tail water delivers to film Integrated Processing System through force (forcing) pump.
(8) backwashing system: the backwash gas of I and II rapid filter and aerated biological activated carbon filter is provided by backwash blower fan, anti-scouring water is provided after water pump pressurizes by back flushing water supply pool inner water.The parameter of back-washing equipment is respectively by determining with water, gas consumption during aforementioned back flushing.Sewer after I and II rapid filter and aerated biological activated carbon filter back washing enters backwashing sewage water collecting tank, by pumped back homogeneous pond after collecting by the road.
(9) mud collection and treatment: mechanical accelerating purifying pool mud is collected through bucket, then be delivered to sludge thickener by shore pipe and do further thickening, the solids flux of sludge thickener is 1.8kg/m
2h; Mud after concentrated, through sludge pumping to sludge dewatering workshop section, the dewatered sludge water ratio after dehydration is 30% ~ 40%, then carries out burning or the disposal such as landfill.
(10) wastewater collection process: the filtrate that the supernatant liquor of sludge thickener and sludge dewatering workshop section produce delivers to homogeneous pond after collecting by the road, enters follow-up sewage disposal link.
Claims (1)
1. paper making tail water reuse and zero release pretreatment technology, is characterized in that comprising following processing step:
(1) homogeneous pond process: will after treatment, the qualified discharge paper making tail water meeting GB3554-2008 " pulp and paper industry pollution discharge standard " is delivered to homogeneous pond by pipe network, the water retention time in homogeneous pond is 3 ~ 4h, is then pumped to mechanical accelerating purifying pool;
(2) mechanical accelerating purifying pool process: the total residence time of homogeneous pond water outlet in this pond is 1.2 ~ 1.5h, the liquid level load of clear water zone is 2.9 ~ 3.6m
3/ m
2h; In order to remove hardness and suspended matter, first in mechanical accelerating purifying pool water inlet pipe, add flocculation agent PAC, NaOH and Na
2cO
3; Coagulant aids PAM is added again in reactive center cylinder; NaOH, Na
2cO
3with the Ca in waste water
2+, Mg
2+in the given area of settling pond, there is chemical reaction, generate the throw out of insoluble, then with PAC, PAM flocculate roll into a ball together with sink to mud district; The overflow of mechanical accelerating purifying pool supernatant liquor is to annular collecting vat, and water outlet gravity flow enters one-level rapid filter;
(3) one-level rapid filter process: using the quartz sand of different-grain diameter grating as filtration medium, the normal rate filtering of one-level rapid filter is 7 ~ 9m/h, and forcing filter rate is 9 ~ 12m/h, and adopt Liquid level backwash process, independent air blasting intensity is 15 ~ 20L/m
2s, time 2min; It is 8 ~ 10L/m that independent water rushes intensity
2s, time 6min; Filtration cycle 12 ~ 24h; The water outlet gravity flow of one-level rapid filter enters one-level and filters product pond soon; Promote through pump again and deliver to O3 contacted oxidation pond;
(4) O3 contacted oxidation pond process: pond, O3 contacted oxidation pond base fabric is equipped with the ozonation aerated dish of many groups, the nearly 0.6 ~ 1h of hydraulic detention time in O3 contacted oxidation pond, and ozone dosage is 30 ~ 40mg/L about, is provided by ozonizer;
The water outlet gravity flow of O3 contacted oxidation pond enters aerated biological activated carbon filter tank;
(5) aerated biological activated carbon filter tank process: the volumetric loading in aerated biological activated carbon filter tank is 0.2 ~ 0.4kgBOD
5/ m
3d, provides the oxygen needed for microbial activities by Aeration fan; Adopt constant water level filtering mode, normal rate filtering is 3.5 ~ 4.5m/h, and forcing filter rate is 5 ~ 6m/h; Adopt gas-water associating back flushing, the air purge time is 3 ~ 5min, and air water associating flush time is 4 ~ 6min, and the independent water rinse time is 8 ~ 10min, and air scour intensity is 12 ~ 16L/m
2s, water backwash rate is 4 ~ 6L/m
2s; The water outlet gravity flow of aerated biological activated carbon filter tank enters secondary rapid filter;
(6) secondary rapid filter process: using the quartz sand of different-grain diameter grating as filtration medium, the normal rate filtering of secondary rapid filter is 7 ~ 9m/h, and forcing filter rate is 9 ~ 12m/h, and adopt Liquid level backwash process, independent air blasting intensity is 15 ~ 20L/m
2s, time 2min; It is 8 ~ 10L/m that independent water rushes intensity
2s, time 6min; Filtration cycle 12 ~ 24h; Secondary rapid filter water outlet gravity flow enters the former pond of film Integrated Processing System;
(7) film Integrated Processing System former pond process: paper making tail water is 1 ~ 1.5h in the residence time in the former pond of film Integrated Processing System, is pumped to film Integrated Processing System after pressurization;
(8) backwashing system process: the backwash gas of I and II rapid filter and aerated biological activated carbon filter is provided by backwash blower fan, anti-scouring water is provided after water pump pressurizes by back flushing water supply pool inner water; Sewer after backwash enters backwashing sewage water collecting tank after collecting by the road, by pumped back homogeneous pond;
(9) mud collection and treatment: mechanical accelerating purifying pool mud is collected through bucket, then be delivered to sludge thickener by shore pipe and do further thickening, the solids flux of sludge thickener is 1 ~ 3kg/m
2h; Mud after concentrated, through sludge pumping to sludge dewatering workshop section, the dewatered sludge water ratio after dehydration is 30% ~ 40%, then carries out burning or the disposal such as landfill;
(10) wastewater collection process: the filtrate that the supernatant liquor of sludge thickener and sludge dewatering workshop section produce delivers to homogeneous pond after collecting by the road, enters follow-up sewage disposal link.
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| CN201510636996.XA CN105174637A (en) | 2015-10-03 | 2015-10-03 | Pretreatment process for papermaking tail water recycling and zero discharge |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510636996.XA CN105174637A (en) | 2015-10-03 | 2015-10-03 | Pretreatment process for papermaking tail water recycling and zero discharge |
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| CN108285223A (en) * | 2018-03-20 | 2018-07-17 | 珠海市晴宇环保科技服务有限公司 | A kind of process for reclaiming and system of industrial wastewater |
| CN110498472A (en) * | 2019-09-26 | 2019-11-26 | 沈阳环境科学研究院 | Feeding apparatus for powdered activated charcoal is used in a kind of processing of landfill leachate tail water |
| CN114315030A (en) * | 2021-12-29 | 2022-04-12 | 华夏碧水环保科技有限公司 | Papermaking tail water membrane integrated step waste salt recycling method and reclaimed water recycling method |
| CN114477662A (en) * | 2022-03-23 | 2022-05-13 | 中国轻工业长沙工程有限公司 | Reclaimed water recycling and ultralow discharge process for waste paper papermaking tail water |
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| CN105565405A (en) * | 2016-02-26 | 2016-05-11 | 徐州工程学院 | Vertical type rapid water purifying device and water purifying method thereof |
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| CN110498472A (en) * | 2019-09-26 | 2019-11-26 | 沈阳环境科学研究院 | Feeding apparatus for powdered activated charcoal is used in a kind of processing of landfill leachate tail water |
| CN114315030A (en) * | 2021-12-29 | 2022-04-12 | 华夏碧水环保科技有限公司 | Papermaking tail water membrane integrated step waste salt recycling method and reclaimed water recycling method |
| CN114477662A (en) * | 2022-03-23 | 2022-05-13 | 中国轻工业长沙工程有限公司 | Reclaimed water recycling and ultralow discharge process for waste paper papermaking tail water |
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