CN106277575A - A kind for the treatment of for reuse technique of papermaking wastewater - Google Patents
A kind for the treatment of for reuse technique of papermaking wastewater Download PDFInfo
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- CN106277575A CN106277575A CN201610655176.XA CN201610655176A CN106277575A CN 106277575 A CN106277575 A CN 106277575A CN 201610655176 A CN201610655176 A CN 201610655176A CN 106277575 A CN106277575 A CN 106277575A
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/28—Treatment of water, waste water, or sewage by sorption
- C02F1/281—Treatment of water, waste water, or sewage by sorption using inorganic sorbents
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/54—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using organic material
- C02F1/56—Macromolecular compounds
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F2001/007—Processes including a sedimentation step
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/26—Nature of the water, waste water, sewage or sludge to be treated from the processing of plants or parts thereof
- C02F2103/28—Nature of the water, waste water, sewage or sludge to be treated from the processing of plants or parts thereof from the paper or cellulose industry
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/30—Aerobic and anaerobic processes
Abstract
The invention belongs to technical field of waste water processing, particularly relate to a kind of pulping wastewater treatment reuse technology, including the regulation set gradually just settling system, settling system and coagulating reclaiming system in AAO, described coagulating reclaiming system includes for collecting the coagulating basin of the supernatant of extraction from described middle sedimentation tank, flocculant is added to be collected treating reuse after collecting removing precipitation fiber in described coagulating basin, described flocculant is in parts by weight, including the polyaluminium sulfate successively added successively and anion-polyacrylamide, dilute hydrochloric acid is utilized to adjust water body pH to 7.2 7.4 in described coagulating basin before described flocculant adds.The present invention can carry out materialization and biochemical treatment to collect reuse to the waste water that papermaking produces, and the present invention has step and is simple and convenient to operate, and the cycle that processes is short, low cost and obvious processing effect, the advantage that every discharge index is less than national standard.
Description
Technical field
The invention belongs to technical field of waste water processing, particularly relate to a kind of pulping wastewater treatment reuse technology.
Background technology
Since " 12 " planning, the reduction of discharging key skill relevant to the seriously polluted industry such as plating, leather, chemical industry, papermaking
The research of art is more and more deep, and in above-mentioned industry technical process, waste gas, waste water, changing waste into resources recovery and utilization technology become relevant
One of research emphasis of area research personnel.The production waste component of these industries is the most more complicated, pollutant kind is numerous
Many, it is generally of CODCr height, BOD5 height, SS concentration height, NH3-N concentration height, colourity high, is the most intractable industry
One of waste water.The traditional materialization of general employing and biochemical processing process process, and can only remove SS, the COD etc. in waste water
Material, other pollutant removals are the best, at more than 200mg/L as ammonia nitrogen concentration, it is impossible to reach sewage drainage standard.
The Chinese invention patent that patent publication No. is CN 105712571 A, publication date is 2016.06.29 discloses one
Technology for treating waste liquide, concrete technology flow process comprises the following steps: (1) is just precipitated: the dirt that will produce in production process
Water carries out preliminary sedimentation in being incorporated into first sedimentation tank；(2) coagulating sedimentation: in water outlet is incorporated into coagulative precipitation tank and add coagulation
Agent is condensed precipitation；(3) filter: be incorporated into water outlet in effluent filter to carry out filtering and remove；(4) Aerobic Process for Treatment: will go out
Water is incorporated in aerobic microbiological pond and carries out Aerobic Process for Treatment；(5) second pond processes: water outlet is incorporated in second pond and carries out muddy water
Separating treatment, (6) fine filtering: water outlet is incorporated in filter and filters by hollow fiber ultrafiltration membrane, last sterilized sterilization
Directly discharge after process.
But finally processing the waste water obtained in this invention and there is the problem that total nitrogen content is too high, this invented technology there is also
Step is complicated, the shortcoming that operation easier is big.
Summary of the invention
It is an object of the invention to provide a kind of pulping wastewater treatment reuse technology, it can carry out thing to the waste water that papermaking produces
Changing and biochemical treatment is to collect reuse, the present invention has step and is simple and convenient to operate, and the cycle is short in process, low cost and place
Reason effect is notable, and every discharge index is less than the advantage of national standard.
The present invention solves the problems referred to above and the technical scheme is that a kind of pulping wastewater treatment reuse technology, including successively
Settling system and coagulating reclaiming system in the regulation arranged just settling system, AAO,
Described regulation just settling system includes being successively set on the bigger to remove proportion for precipitation of paper machine room discharge outlet
Float and the setting pot of impurity, for adsorbing the flyash sedimentation tank removing relatively small impurities granule in waste water and for receiving
Collection, through the first sedimentation tank of precipitation adsorption processed waste water for the first time, is provided with for extracting upper clear supernate extremely in described just sedimentation tank
The draw-off pump of settling system in described AAO；
In described AAO, settling system includes that the partial organic substances in waste water after being successively set on described just sedimentation tank carries out ammonia
Change and discharge the anaerobic zone of phosphorus, for the anoxic zone of denitrogenation, for removing BOD in waste water and carrying out the good of nitrification and release phosphorus simultaneously
Oxygen district and sinking after the waste water processed through AAO method is carried out precipitate and separate and supernatant is overflowed to described coagulating
The middle sedimentation tank of shallow lake system, described aerobic zone is provided with the internal reflux being sent to described anoxic zone, and described middle sedimentation tank is provided with and is sent to institute
Stating the exteenal reflux of anaerobic zone, described internal reflux and exteenal reflux are mixed-liquor return, the reflux ratio (backflow of described internal reflux
Amount/anoxic zone inflow) it is 200%, the reflux ratio (capacity of returns/anaerobic zone inflow) of described exteenal reflux is 100%, described interior time
The backflow of stream adds for reducing the oxygen scavenger of oxygen content in described internal reflux liquid；
Described coagulating reclaiming system includes for collecting the coagulating basin of the supernatant of extraction from described middle sedimentation tank, toward institute
Flocculant is added to be collected reuse after collecting removing precipitation fiber in stating coagulating basin.
Further preferred technical scheme is: described oxygen scavenger in parts by weight, including mix homogeneously each other
The thiourea dioxide of 60-65 part, the sodium sulfite of 25-40 part and the sodium hydroxide of 3-5 part, described sodium hydroxide is used for regulating
The pH value of described internal reflux liquid is to 7.5-7.8.
Further preferred technical scheme is: described oxygen scavenger in parts by weight, including the sulfur dioxide of 60-62 part
Urea, the sodium sulfite of 33-40 part and the sodium hydroxide of 4-5 part.
Further preferred technical scheme is: described internal reflux liquid is to be drawn into institute by the described aerobic zone carrying out aeration
State the mixed liquor of anoxic zone, the extraction pipeline of described internal reflux liquid be provided with the interpolation notch added for described oxygen scavenger,
The addition of described oxygen scavenger is 0.60-0.85g/L with the ratio of the capacity of returns of described internal reflux liquid.
Further preferred technical scheme is: described exteenal reflux liquid is for be drawn into described anaerobic zone from described middle sedimentation tank
The backflow containing mud, in described exteenal reflux liquid, the weight of mud accounts for the 20-24% of described exteenal reflux liquid gross weight.
Further preferred technical scheme is: described anaerobic zone be provided with for stir microbial cells with carry out ammonification and
First agitating device of release phosphorus, is provided with in described anoxic zone for stirring microbial cells to carry out the second of biological denitrification
Agitating device, the mixing speed of described first agitating device and the second agitating device is no more than 5r/min.
Further preferred technical scheme is: described flocculant in parts by weight, including the polymerization successively added successively
Aluminum sulfate and anion-polyacrylamide, utilize dilute hydrochloric acid to adjust water body in described coagulating basin before described flocculant adds
PH to 7.2-7.4.
Further preferred technical scheme is: described polyaluminium sulfate and described anion-polyacrylamide are just formed
Negativity flocculant complex role, described polyaluminium sulfate addition is 50-55mg/L, adding of described anion-polyacrylamide
Entering amount is 0.5-0.55mg/L, carries out suitable stir process when flocculation reaction, controls stir speed (S.S.) at 100-220r/min.
Further preferred technical scheme is: the supernatant in described flyash sedimentation tank is drawn into described just precipitation
The pipeline in pond is provided with the filtration mesh screen for wood fibre more than 0.2mm is collected by filtration, and described filtration mesh screen is 60 purposes
Tilting mesh screen, the angle between described mesh screen and waste water flowing travel direction is 30-42 °.
Further preferred technical scheme is: be equipped with in described setting pot, flyash sedimentation tank and middle sedimentation tank
For drawing with discharge mud for precipitating the mud suction means of recovery, described sludge solidification molding is used as agriculture after making mud cake
Field fertilizer.
The present invention can carry out materialization and biochemical treatment to collect reuse to the waste water that papermaking produces, and the present invention has step
Being simple and convenient to operate, process that the cycle is short, low cost and obvious processing effect, every discharge index is excellent less than national standard
Point.
Accompanying drawing explanation
Fig. 1 is the process chart of the present invention.
Detailed description of the invention
The following stated is only presently preferred embodiments of the present invention, is not defined the scope of the present invention.
Embodiment 1: as shown in Figure 1, a kind of pulping wastewater treatment reuse technology, precipitates including at the beginning of the regulation set gradually
Settling system and coagulating reclaiming system in system, AAO,
Described regulation just settling system includes being successively set on the bigger to remove proportion for precipitation of paper machine room discharge outlet
Float and the setting pot of impurity, for adsorbing the flyash sedimentation tank removing relatively small impurities granule in waste water and for receiving
Supernatant in described flyash sedimentation tank, through the first sedimentation tank of precipitation adsorption processed waste water for the first time, is drawn into institute by collection
The pipeline stating just sedimentation tank is provided with the filtration mesh screen for wood fibre more than 0.2mm is collected by filtration, described filtration mesh screen
Being the inclination mesh screen of 60 mesh, the angle between described mesh screen and waste water flowing travel direction is 30 °, and described filtration mesh screen will retain
The fiber obtained recycles, and improves the resource utilization of paper-making process further.Described just sedimentation tank is provided with for taking out
Take the draw-off pump of settling system in upper clear supernate extremely described AAO, in whole described regulation just settling system, at pure physics
Reason method, can preferably remove the large-scale impurity in waste water, suspended particulate substance and big fiber type, and precipitate at the beginning of described regulation
The flyash used in system has cheap feature simple and easy to get so that the feasibility of described waste water treatment process obtains
Further improve；
In described AAO, settling system includes that the partial organic substances in waste water after being successively set on described just sedimentation tank carries out ammonia
Change discharge simultaneously phosphorus anaerobic zone (A), for the anoxic zone (A) of denitrogenation, be used for removing in waste water BOD and carry out nitrification and release
The aerobic zone (O) of phosphorus and for the waste water processed through AAO method being carried out precipitate and separate and supernatant being overflowed to described mixing
The middle sedimentation tank of solidifying reaction postprecipitation system, described aerobic zone is provided with the internal reflux being sent to described anoxic zone, described middle sedimentation tank
Being provided with the exteenal reflux being sent to described anaerobic zone, described internal reflux and exteenal reflux are mixed-liquor return, returning of described internal reflux
Flow ratio (capacity of returns/anoxic zone inflow) is 200%, and the reflux ratio (capacity of returns/anaerobic zone inflow) of described exteenal reflux is
100%, the backflow of described internal reflux adds for reducing the oxygen scavenger of oxygen content in described internal reflux liquid.Described anaerobism
District exists and releases phosphorus bacterium and other thalline for discharge phosphorus, partial organic substances can be carried out ammonification, generate ammonia nitrogen and portion
Point nitrate, described anoxic zone (A) mainly by biological denitrification, using as the nitrate of nitrate and Nitrite transformation
Become nitrogen discharge, and nitrate mainly takes back described anaerobic zone by described internal reflux from described aerobic zone.According to interior time
Flow ratio (R) is 200%, external reflux ratio (r) is the setting of 100%, can be in the hope of the theoretical clearance (E of total nitrogenO):
EO=(R+r)/(R+r+1)=75%
But during described internal reflux, described internal reflux process takes back a large amount of oxygen, described internal reflux from described aerobic zone
Ratio is the biggest, and the oxygen content bringing back to described anoxic zone is the most, and impact carries out denitrifying thalline originally under anaerobic condition
Active state, is greatly reduced the nitrogen removal rate of reality, and the actual nitrogen removal rate that existing AAO method can reach is difficult to super
Cross 60%.
Described coagulating reclaiming system includes for collecting the coagulating basin of the supernatant of extraction from described middle sedimentation tank,
Flocculant is added to be collected reuse after collecting removing precipitation fiber in described coagulating basin.In described coagulating basin, described
Coagulation process is included in waste water and adds positively charged inorganic flocculating agent and with the elimination of colloid stability carried out and generate small aggregation
Coacervation process and add electronegative Flokal B and be accumulated into the flocculation of floccule body to carry out small float
Journey.
Described oxygen scavenger in parts by weight, including thiourea dioxide, the Asia of 35 parts of 60 parts of mix homogeneously each other
Sodium sulfate and the sodium hydroxide of 5 parts, described sodium hydroxide is for regulating the pH value of described internal reflux liquid to 7.5.Return in described
Flow liquid is the mixed liquor being drawn into described anoxic zone by the described aerobic zone carrying out aeration, at the extraction pipeline of described internal reflux liquid
Be provided with the interpolation notch added for described oxygen scavenger, the capacity of returns of the addition of described oxygen scavenger and described internal reflux liquid it
Ratio is 0.60g/L.Described exteenal reflux liquid is the backflow containing mud being drawn into described anaerobic zone from described middle sedimentation tank, institute
State the weight of mud in exteenal reflux liquid and account for the 20% of described exteenal reflux liquid gross weight.
Described anaerobic zone be provided with for stir microbial cells with carry out ammonification and release phosphorus the first agitating device, described
It is provided with for stirring microbial cells to carry out the second agitating device of biological denitrification in anoxic zone, described first agitating device
And second the mixing speed of agitating device be 3r/min.Described flocculant in parts by weight, adds including priority successively
Polyaluminium sulfate and anion-polyacrylamide, utilize dilute hydrochloric acid to adjust in described coagulating basin before described flocculant adds
Water body pH to 7.2.Described polyaluminium sulfate and described anion-polyacrylamide form positive negativity flocculant complex role, institute
Stating polyaluminium sulfate addition is 50mg/L, and the addition of described anion-polyacrylamide is 0.5mg/L, in flocculation reaction
The stir process that Shi Jinhang is suitable, controls stir speed (S.S.) at 100r/min.
Described setting pot, flyash sedimentation tank and middle sedimentation tank are equipped with for drawing to discharge mud for precipitating
The mud suction means reclaimed, described sludge solidification molding is used as farmland fertilizer after making mud cake.Described setting pot, flyash are heavy
Precipitation in pond, shallow lake is main based on bigger wooden foreign material and large-scale fiber impurity, the silt deposit in described middle sedimentation tank
Rich in P elements, having higher fertility, this recycling arranges and further increases the feasible of described waste water treatment process
Property.
In the present embodiment, successively to raw wastewater and collect reuse waste water with regard to colourity, transmittance, CODCr, BOD5, SS with
And six aspects of TN carry out detection contrast, and calculate nitrogen removal rate, obtain following table:
Project raw wastewater collects the waste water remarks of reuse
Colourity (speed times) 170 10
Transmittance 21% 97%
CODCr(mg/L) 312 26
BOD5(mg/L) 55 12
SS(mg/L) 181 6
TN(mg/L) 13.7 9.2 nitrogen removal rate=67.2%
In the present embodiment, the indices detected all meets four class indexs of industrial discharge waste water so may be used for collecting
Reuse, wherein ammonia-nitrogen content and total phosphorus content also have and just can be well solved in existing waste water treatment process, so
Do not arrange in above-mentioned table.In the indices of detection, it is exactly total nitrogen (TN) that waste water processes be most difficult to, existing all kinds of
Biological denitrification method includes oxidation ditch series, SBR series, MBR is serial, AAO is serial and multistage AO series etc. is all difficult to will be total
Nitrogen removal efficiency is accomplished more than 60%, or is difficult to accomplish the most economic effect on the premise of control nitrogen removal rate is more than 60%
Benefit, i.e. be use method costly, be not suitable for promoting on a large scale, this technique has good waste water treatment effect, and total nitrogen goes
Except the feature that rate is high and low cost is easily promoted.
Embodiment 2: as shown in Figure 1, a kind of pulping wastewater treatment reuse technology, precipitates including at the beginning of the regulation set gradually
Settling system and coagulating reclaiming system in system, AAO,
Described regulation just settling system includes being successively set on the bigger to remove proportion for precipitation of paper machine room discharge outlet
Float and the setting pot of impurity, for adsorbing the flyash sedimentation tank removing relatively small impurities granule in waste water and for receiving
Supernatant in described flyash sedimentation tank, through the first sedimentation tank of precipitation adsorption processed waste water for the first time, is drawn into institute by collection
The pipeline stating just sedimentation tank is provided with the filtration mesh screen for wood fibre more than 0.2mm is collected by filtration, described filtration mesh screen
Being the inclination mesh screen of 60 mesh, the angle between described mesh screen and waste water flowing travel direction is 30 °, and described filtration mesh screen will retain
The fiber obtained recycles, and improves the resource utilization of paper-making process further.Described just sedimentation tank is provided with for taking out
Take the draw-off pump of settling system in upper clear supernate extremely described AAO, in whole described regulation just settling system, at pure physics
Reason method, can preferably remove the large-scale impurity in waste water, suspended particulate substance and big fiber type, and precipitate at the beginning of described regulation
The flyash used in system has cheap feature simple and easy to get so that the feasibility of described waste water treatment process obtains
Further improve；
In described AAO, settling system includes that the partial organic substances in waste water after being successively set on described just sedimentation tank carries out ammonia
Change discharge simultaneously phosphorus anaerobic zone (A), for the anoxic zone (A) of denitrogenation, be used for removing in waste water BOD and carry out nitrification and release
The aerobic zone (O) of phosphorus and for the waste water processed through AAO method being carried out precipitate and separate and supernatant being overflowed to described mixing
The middle sedimentation tank of solidifying reaction postprecipitation system, described aerobic zone is provided with the internal reflux being sent to described anoxic zone, described middle sedimentation tank
Being provided with the exteenal reflux being sent to described anaerobic zone, described internal reflux and exteenal reflux are mixed-liquor return, returning of described internal reflux
Flow ratio (capacity of returns/anoxic zone inflow) is 200%, and the reflux ratio (capacity of returns/anaerobic zone inflow) of described exteenal reflux is
100%, the backflow of described internal reflux adds for reducing the oxygen scavenger of oxygen content in described internal reflux liquid.Described anaerobism
District exists and releases phosphorus bacterium and other thalline for discharge phosphorus, partial organic substances can be carried out ammonification, generate ammonia nitrogen and portion
Point nitrate, described anoxic zone (A) mainly by biological denitrification, using as the nitrate of nitrate and Nitrite transformation
Become nitrogen discharge, and nitrate mainly takes back described anaerobic zone by described internal reflux from described aerobic zone.According to interior time
Flow ratio (R) is 200%, external reflux ratio (r) is the setting of 100%, can be in the hope of the theoretical clearance (E of total nitrogenO):
EO=(R+r)/(R+r+1)=75%
But during described internal reflux, described internal reflux process takes back a large amount of oxygen, described internal reflux from described aerobic zone
Ratio is the biggest, and the oxygen content bringing back to described anoxic zone is the most, and impact carries out denitrifying thalline originally under anaerobic condition
Active state, is greatly reduced the nitrogen removal rate of reality, and the actual nitrogen removal rate that existing AAO method can reach is difficult to super
Cross 60%.
Described coagulating reclaiming system includes for collecting the coagulating basin of the supernatant of extraction from described middle sedimentation tank,
Flocculant is added to be collected reuse after collecting removing precipitation fiber in described coagulating basin.In described coagulating basin, described
Coagulation process is included in waste water and adds positively charged inorganic flocculating agent and with the elimination of colloid stability carried out and generate small aggregation
Coacervation process and add electronegative Flokal B and be accumulated into the flocculation of floccule body to carry out small float
Journey.
Described oxygen scavenger in parts by weight, including thiourea dioxide, the Asia of 35 parts of 61 parts of mix homogeneously each other
Sodium sulfate and the sodium hydroxide of 4 parts, described sodium hydroxide is for regulating the pH value of described internal reflux liquid to 7.6.Return in described
Flow liquid is the mixed liquor being drawn into described anoxic zone by the described aerobic zone carrying out aeration, at the extraction pipeline of described internal reflux liquid
Be provided with the interpolation notch added for described oxygen scavenger, the capacity of returns of the addition of described oxygen scavenger and described internal reflux liquid it
Ratio is 0.70g/L.Described exteenal reflux liquid is the backflow containing mud being drawn into described anaerobic zone from described middle sedimentation tank, institute
State the weight of mud in exteenal reflux liquid and account for the 22% of described exteenal reflux liquid gross weight.
Described anaerobic zone be provided with for stir microbial cells with carry out ammonification and release phosphorus the first agitating device, described
It is provided with for stirring microbial cells to carry out the second agitating device of biological denitrification in anoxic zone, described first agitating device
And second the mixing speed of agitating device be 4r/min.Described flocculant in parts by weight, adds including priority successively
Polyaluminium sulfate and anion-polyacrylamide, utilize dilute hydrochloric acid to adjust in described coagulating basin before described flocculant adds
Water body pH to 7.3.Described polyaluminium sulfate and described anion-polyacrylamide form positive negativity flocculant complex role, institute
Stating polyaluminium sulfate addition is 52mg/L, and the addition of described anion-polyacrylamide is 0.52mg/L, anti-in flocculation
At once carry out suitable stir process, control stir speed (S.S.) at 150r/min.
Described setting pot, flyash sedimentation tank and middle sedimentation tank are equipped with for drawing to discharge mud for precipitating
The mud suction means reclaimed, described sludge solidification molding is used as farmland fertilizer after making mud cake.Described setting pot, flyash are heavy
Precipitation in pond, shallow lake is main based on bigger wooden foreign material and large-scale fiber impurity, the silt deposit in described middle sedimentation tank
Rich in P elements, having higher fertility, this recycling arranges and further increases the feasible of described waste water treatment process
Property.
In the present embodiment, successively to raw wastewater and collect reuse waste water with regard to colourity, transmittance, CODCr, BOD5, SS with
And six aspects of TN carry out detection contrast, and calculate nitrogen removal rate, obtain following table:
Project raw wastewater collects the waste water remarks of reuse
Colourity (speed times) 170 12
Transmittance 21% 96%
CODCr(mg/L) 312 25
BOD5(mg/L) 55 13
SS(mg/L) 181 7
TN(mg/L) 13.7 9.3 nitrogen removal rate=67.8%
In the present embodiment, the indices detected all meets four class indexs of industrial discharge waste water so may be used for collecting
Reuse, wherein ammonia-nitrogen content and total phosphorus content also have and just can be well solved in existing waste water treatment process, so
Do not arrange in above-mentioned table.In the indices of detection, it is exactly total nitrogen (TN) that waste water processes be most difficult to, existing all kinds of
Biological denitrification method includes oxidation ditch series, SBR series, MBR is serial, AAO is serial and multistage AO series etc. is all difficult to will be total
Nitrogen removal efficiency is accomplished more than 60%, or is difficult to accomplish the most economic effect on the premise of control nitrogen removal rate is more than 50%
Benefit, i.e. be use method costly, be not suitable for promoting on a large scale, this technique has good waste water treatment effect, and total nitrogen goes
Except the feature that rate is high and low cost is easily promoted.
Embodiment 3: as shown in Figure 1, a kind of pulping wastewater treatment reuse technology, precipitates including at the beginning of the regulation set gradually
Settling system and coagulating reclaiming system in system, AAO,
Described regulation just settling system includes being successively set on the bigger to remove proportion for precipitation of paper machine room discharge outlet
Float and the setting pot of impurity, for adsorbing the flyash sedimentation tank removing relatively small impurities granule in waste water and for receiving
Supernatant in described flyash sedimentation tank, through the first sedimentation tank of precipitation adsorption processed waste water for the first time, is drawn into institute by collection
The pipeline stating just sedimentation tank is provided with the filtration mesh screen for wood fibre more than 0.2mm is collected by filtration, described filtration mesh screen
Being the inclination mesh screen of 60 mesh, the angle between described mesh screen and waste water flowing travel direction is 30 °, and described filtration mesh screen will retain
The fiber obtained recycles, and improves the resource utilization of paper-making process further.Described just sedimentation tank is provided with for taking out
Take the draw-off pump of settling system in upper clear supernate extremely described AAO, in whole described regulation just settling system, at pure physics
Reason method, can preferably remove the large-scale impurity in waste water, suspended particulate substance and big fiber type, and precipitate at the beginning of described regulation
The flyash used in system has cheap feature simple and easy to get so that the feasibility of described waste water treatment process obtains
Further improve；
In described AAO, settling system includes that the partial organic substances in waste water after being successively set on described just sedimentation tank carries out ammonia
Change discharge simultaneously phosphorus anaerobic zone (A), for the anoxic zone (A) of denitrogenation, be used for removing in waste water BOD and carry out nitrification and release
The aerobic zone (O) of phosphorus and for the waste water processed through AAO method being carried out precipitate and separate and supernatant being overflowed to described mixing
The middle sedimentation tank of solidifying reaction postprecipitation system, described aerobic zone is provided with the internal reflux being sent to described anoxic zone, described middle sedimentation tank
Being provided with the exteenal reflux being sent to described anaerobic zone, described internal reflux and exteenal reflux are mixed-liquor return, returning of described internal reflux
Flow ratio (capacity of returns/anoxic zone inflow) is 200%, and the reflux ratio (capacity of returns/anaerobic zone inflow) of described exteenal reflux is
100%, the backflow of described internal reflux adds for reducing the oxygen scavenger of oxygen content in described internal reflux liquid.Described anaerobism
District exists and releases phosphorus bacterium and other thalline for discharge phosphorus, partial organic substances can be carried out ammonification, generate ammonia nitrogen and portion
Point nitrate, described anoxic zone (A) mainly by biological denitrification, using as the nitrate of nitrate and Nitrite transformation
Become nitrogen discharge, and nitrate mainly takes back described anaerobic zone by described internal reflux from described aerobic zone.According to interior time
Flow ratio (R) is 200%, external reflux ratio (r) is the setting of 100%, can be in the hope of the theoretical clearance (E of total nitrogenO):
EO=(R+r)/(R+r+1)=75%
But during described internal reflux, described internal reflux process takes back a large amount of oxygen, described internal reflux from described aerobic zone
Ratio is the biggest, and the oxygen content bringing back to described anoxic zone is the most, and impact carries out denitrifying thalline originally under anaerobic condition
Active state, is greatly reduced the nitrogen removal rate of reality, and the actual nitrogen removal rate that existing AAO method can reach is difficult to super
Cross 60%.
Described coagulating reclaiming system includes for collecting the coagulating basin of the supernatant of extraction from described middle sedimentation tank,
Flocculant is added to be collected reuse after collecting removing precipitation fiber in described coagulating basin.In described coagulating basin, described
Coagulation process is included in waste water and adds positively charged inorganic flocculating agent and with the elimination of colloid stability carried out and generate small aggregation
Coacervation process and add electronegative Flokal B and be accumulated into the flocculation of floccule body to carry out small float
Journey.
Described oxygen scavenger in parts by weight, including thiourea dioxide, the Asia of 34 parts of 62 parts of mix homogeneously each other
Sodium sulfate and the sodium hydroxide of 4 parts, described sodium hydroxide is for regulating the pH value of described internal reflux liquid to 7.8.Return in described
Flow liquid is the mixed liquor being drawn into described anoxic zone by the described aerobic zone carrying out aeration, at the extraction pipeline of described internal reflux liquid
Be provided with the interpolation notch added for described oxygen scavenger, the capacity of returns of the addition of described oxygen scavenger and described internal reflux liquid it
Ratio is 0.85g/L.Described exteenal reflux liquid is the backflow containing mud being drawn into described anaerobic zone from described middle sedimentation tank, institute
State the weight of mud in exteenal reflux liquid and account for the 24% of described exteenal reflux liquid gross weight.
Described anaerobic zone be provided with for stir microbial cells with carry out ammonification and release phosphorus the first agitating device, described
It is provided with for stirring microbial cells to carry out the second agitating device of biological denitrification in anoxic zone, described first agitating device
And second the mixing speed of agitating device be 5r/min.Described flocculant in parts by weight, adds including priority successively
Polyaluminium sulfate and anion-polyacrylamide, utilize dilute hydrochloric acid to adjust in described coagulating basin before described flocculant adds
Water body pH to 7.4.Described polyaluminium sulfate and described anion-polyacrylamide form positive negativity flocculant complex role, institute
Stating polyaluminium sulfate addition is 55mg/L, and the addition of described anion-polyacrylamide is 0.55mg/L, anti-in flocculation
At once carry out suitable stir process, control stir speed (S.S.) at 220r/min.
Described setting pot, flyash sedimentation tank and middle sedimentation tank are equipped with for drawing to discharge mud for precipitating
The mud suction means reclaimed, described sludge solidification molding is used as farmland fertilizer after making mud cake.Described setting pot, flyash are heavy
Precipitation in pond, shallow lake is main based on bigger wooden foreign material and large-scale fiber impurity, the silt deposit in described middle sedimentation tank
Rich in P elements, having higher fertility, this recycling arranges and further increases the feasible of described waste water treatment process
Property.
In the present embodiment, successively to raw wastewater and collect reuse waste water with regard to colourity, transmittance, CODCr, BOD5, SS with
And six aspects of TN carry out detection contrast, and calculate nitrogen removal rate, obtain following table:
Project raw wastewater collects the waste water remarks of reuse
Colourity (speed times) 170 13
Transmittance 21% 95%
CODCr(mg/L) 312 27
BOD5(mg/L) 55 15
SS(mg/L) 181 9
TN(mg/L) 13.7 9.5 nitrogen removal rate=69.3%
In the present embodiment, the indices detected all meets four class indexs of industrial discharge waste water so may be used for collecting
Reuse, wherein ammonia-nitrogen content and total phosphorus content also have and just can be well solved in existing waste water treatment process, so
Do not arrange in above-mentioned table.In the indices of detection, it is exactly total nitrogen (TN) that waste water processes be most difficult to, existing all kinds of
Biological denitrification method includes oxidation ditch series, SBR series, MBR is serial, AAO is serial and multistage AO series etc. is all difficult to will be total
Nitrogen removal efficiency is accomplished more than 60%, or is difficult to accomplish the most economic effect on the premise of control nitrogen removal rate is more than 50%
Benefit, i.e. be use method costly, be not suitable for promoting on a large scale, this technique has good waste water treatment effect, and total nitrogen goes
Except the feature that rate is high and low cost is easily promoted.
Above in conjunction with accompanying drawing, embodiments of the present invention are explained in detail, but the invention is not restricted to above-mentioned embodiment party
Formula, in the ken that described technical field those of ordinary skill is possessed, it is also possible to before without departing from present inventive concept
Put that various modification can be adapted.These are all the most creative amendments, as long as being all subject in scope of the presently claimed invention
Protection to Patent Law.
Claims (9)
1. a treatment for reuse technique for papermaking wastewater, including settling system in the regulation set gradually just settling system, AAO with
And coagulating reclaiming system, it is characterised in that: described coagulating reclaiming system includes for collecting from described middle sedimentation tank
The coagulating basin of the supernatant of middle extraction, adds flocculant to be collected treating after collecting removing precipitation fiber in described coagulating basin
Reuse, described flocculant in parts by weight, including the polyaluminium sulfate successively added successively and anion-polyacrylamide,
Dilute hydrochloric acid is utilized to adjust water body pH to 7.2-7.4 in described coagulating basin before described flocculant adds.
The treatment for reuse technique of a kind of papermaking wastewater the most according to claim 1, it is characterised in that: described polyaluminium sulfate
Forming positive negativity flocculant complex role with described anion-polyacrylamide, described polyaluminium sulfate addition is 50-
55mg/L, the addition of described anion-polyacrylamide is 0.5-0.55mg/L, carries out suitable stirring when flocculation reaction
Mix process, control stir speed (S.S.) at 100-220r/min.
The treatment for reuse technique of a kind of papermaking wastewater the most according to claim 1, it is characterised in that: precipitate at the beginning of described regulation
System include being successively set on paper machine room discharge outlet for precipitation to remove the heavy of the bigger float of proportion and impurity
Sand pond, for adsorbing the flyash sedimentation tank removing relatively small impurities granule in waste water and inhaling through precipitation for the first time for collecting
The first sedimentation tank of attached processed waste water, is provided with for extracting upper clear supernate to settling system in described AAO in described just sedimentation tank
Draw-off pump, the pipeline that the supernatant in described flyash sedimentation tank is drawn into described just sedimentation tank is provided with for filtering receipts
The filtration mesh screen of the collection wood fibre more than 0.2mm, described filtration mesh screen is the inclination mesh screen of 60 mesh, described mesh screen and waste water stream
Angle between dynamic travel direction is 30-42 °.
The treatment for reuse technique of a kind of papermaking wastewater the most according to claim 3, it is characterised in that: described setting pot, powder
Coal ash sedimentation tank and middle sedimentation tank are equipped with for drawing to discharge mud for precipitating the mud suction means of recovery, institute
State after mud cake is made in sludge solidification molding and be used as farmland fertilizer.
The treatment for reuse technique of a kind of papermaking wastewater the most according to claim 1, it is characterised in that: described AAO precipitates
System includes that the partial organic substances in waste water after being successively set on described just sedimentation tank carries out ammonification and discharges detesting of phosphorus simultaneously
Oxygen district, for the anoxic zone of denitrogenation, for removing BOD in waste water and carrying out nitrification and the aerobic zone of release phosphorus and for warp
The waste water crossing the process of AAO method carries out precipitate and separate and supernatant overflows to the middle precipitation of described coagulating postprecipitation system
Pond, described aerobic zone is provided with the internal reflux being sent to described anoxic zone, and described middle sedimentation tank is provided with and is sent to outer time of described anaerobic zone
Flowing, described internal reflux and exteenal reflux are mixed-liquor return, the reflux ratio (capacity of returns/anoxic zone inflow) of described internal reflux
Being 200%, the reflux ratio (capacity of returns/anaerobic zone inflow) of described exteenal reflux is 100%, adds in the backflow of described internal reflux
For reducing the oxygen scavenger of oxygen content in described internal reflux liquid, described oxygen scavenger in parts by weight, including mixing each other
The uniform thiourea dioxide of 60-65 part, the sodium sulfite of 25-40 part and the sodium hydroxide of 3-5 part, described sodium hydroxide is used
In regulating the pH value of described internal reflux liquid to 7.5-7.8.
The treatment for reuse technique of a kind of papermaking wastewater the most according to claim 5, it is characterised in that: described oxygen scavenger is with weight
Amount part meter, including thiourea dioxide, the sodium sulfite of 33-40 part and the sodium hydroxide of 4-5 part of 60-62 part.
The treatment for reuse technique of a kind of papermaking wastewater the most according to claim 6, it is characterised in that: described internal reflux liquid is
It is drawn into the mixed liquor of described anoxic zone by the described aerobic zone carrying out aeration, the extraction pipeline of described internal reflux liquid is provided with
The interpolation notch added for described oxygen scavenger, the addition of described oxygen scavenger with the ratio of the capacity of returns of described internal reflux liquid is
0.60-0.85g/L。
The treatment for reuse technique of a kind of papermaking wastewater the most according to claim 7, it is characterised in that: described exteenal reflux liquid is
Be drawn into the backflow containing mud of described anaerobic zone from described middle sedimentation tank, in described exteenal reflux liquid, the weight of mud accounts for institute
State the 20-24% of exteenal reflux liquid gross weight.
The treatment for reuse technique of a kind of papermaking wastewater the most according to claim 8, it is characterised in that: described anaerobic zone is provided with
For stir microbial cells with carry out ammonification and release phosphorus the first agitating device, be provided with for stirring micro-in described anoxic zone
Biomass to carry out the second agitating device of biological denitrification, described first agitating device and the stirring of the second agitating device
Speed is no more than 5r/min.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108217947A (en) * | 2018-02-14 | 2018-06-29 | 温志军 | A kind of batch-type control method of sewage disposal AO and AAO techniques |
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|---|---|---|---|---|
| CN102992553A (en) * | 2012-12-31 | 2013-03-27 | 黄河三角洲京博化工研究院有限公司 | Method for comprehensively treating and utilizing dissolving pulp black liquor |
| CN205099548U (en) * | 2015-10-20 | 2016-03-23 | 光大水务（深圳）有限公司 | A section + A2O sewage treatment system |
| CN105776542A (en) * | 2016-04-20 | 2016-07-20 | 安徽国祯环保节能科技股份有限公司 | Improved AAO wastewater treatment process for obtaining standard IV-class surface water |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102992553A (en) * | 2012-12-31 | 2013-03-27 | 黄河三角洲京博化工研究院有限公司 | Method for comprehensively treating and utilizing dissolving pulp black liquor |
| CN205099548U (en) * | 2015-10-20 | 2016-03-23 | 光大水务（深圳）有限公司 | A section + A2O sewage treatment system |
| CN105776542A (en) * | 2016-04-20 | 2016-07-20 | 安徽国祯环保节能科技股份有限公司 | Improved AAO wastewater treatment process for obtaining standard IV-class surface water |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108217947A (en) * | 2018-02-14 | 2018-06-29 | 温志军 | A kind of batch-type control method of sewage disposal AO and AAO techniques |
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