CN104310683B - Development and control method of papermaking wastewater - Google Patents
Development and control method of papermaking wastewater Download PDFInfo
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- CN104310683B CN104310683B CN201410507595.XA CN201410507595A CN104310683B CN 104310683 B CN104310683 B CN 104310683B CN 201410507595 A CN201410507595 A CN 201410507595A CN 104310683 B CN104310683 B CN 104310683B
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Abstract
The invention discloses a development and control method of papermaking wastewater. A development and control process of the papermaking wastewater comprises the following steps: discharging black liquor from a black liquor drain outlet, introducing the black liquor which is treated in a desilting ditch into an adjusting tank, pumping the black liquor which is subjected to sufficient precipitation and adjustment into a stirrer in which an aluminum sulfate solution is added from a high-level dosing slot, starting the stirrer to stir, converting residual alkali in the black liquor and the aluminum sulfate solution into aluminum hydroxide after a pH value is 3, starting a centrifugal machine to separate out white crystal aluminum hydroxide, and performing filer pressing to obtain dehydrated lignin, concentrating the dehydrated lignin into pectin products with different concentrations, drying by using the produced vapor and reducing the utilized vapor into cooling water for recycling. The development and control method disclosed by the invention adopts a novel sectional comprehensive treatment process, is scientific and reasonable in process, complete in wastewater treatment, and capable of realizing total recycle and zero discharge and solving secondary pollution; and moreover, the products with relatively high values are developed, so that the waste is changed into things of value, and thus, the production cost is greatly lowered.
Description
Technical field: the present invention relates to one kind is applied to grass, wood pulp papermaking, alkaline process, imido method, sub- sodium method, Calx legal system
A kind of papermaking wastewater exploitation and control method of slurry.
Background technology: though there are multiple papermaking process in China, straw pulp alkali paper-making still accounts for the overwhelming majority.These years due to ring
The requirement of border protection, the sewage that this papermaking produces is not administered well, causes and causes serious pollution, and is forced
Using wood pulp papermaking.In addition the alkali recovery technology of the improvement pulp black liquor of Introduced From Abroad, then burnt the lignin of preciousness in vain,
Wealth is replaced ashes, and the flue dust discharged and ashes cause the secondary pollution of air.This technology can only process black liquor, and big
In amount, latter end sewage still cannot process.
China is the poor country of forest, is the country having a large population and a few land again, or large agricultural country, has abundant straw to make
Paper material, abandoning in vain or burn really unfortunate.And adopt wood pulp papermaking, no matter being deforestation and making raw material forest slurrying, all cut
Foot is suitable to be carried out, and is worthless.
Content of the invention: the present invention provides innovation for achieving the above object using novel segmentation comprehensive processing technique, dirty
Water process thoroughly recycles zero-emission entirely, turns waste into wealth, and a kind of papermaking wastewater exploitation that production cost application is greatly reduced is controlled
Reason method.
The purpose of the present invention is achieved through the following technical solutions:
(1) its black liquor exploitation and control technique is:
1. black liquor is discharged from black liquor sewage draining exit, enter black liquor after processing through desilting ditch and store up pond, after abundant precipitation, use
By in its suction agitator, aluminum sulfate solution is added in agitator sewage pump by sewage pump simultaneously, aluminum sulfate solution addition
For the 1 16 of black liquor, start agitator simultaneously and be stirred, when ph value reaches 3, the residual alkali in black liquor and aluminum sulfate
Solution chemical combination is aluminium hydroxide, and lignin is precipitated；
2. being continuously added to the black liquor precipitating and aluminum sulfate solution, completes black liquor the overflowing along agitator reacted
Discharge orifice flows into centrifuge, sets terylene 200 mesh filter cloth in centrifuge, and after black liquor enters centrifuge, centrifuge starts, and separates first
Go out white crystalline body aluminium hydroxide；And the liquid being mixed with lignin is then separated, enters into and there is gravitational settling function
Pressure filter, obtains dehydration lignin through filter pressing；Pressure filter Gravity Separation reaches can be after filter pressing concentration, and the liquid being press-filtered out is together with weight
The liquid that power is isolated flows into evaporation concentrator together, is condensed into the pectin product of variable concentrations as needed；Concentrate pectin institute
The water vapour producing carries out drying utilization, and sharp used water vapour is reduced to cooling water, then is back to production cycle water；
(2) its medium wastewater exploitation and control technique is:
1. sewage is discharged from sewage draining exit, blocks grid through floating thing, slurry recycling network enters desilting ditch after processing, then through desilting ditch
After precipitation process, enter conciliation pond, after reconciling through abundant precipitation, with sewage pump by its suction agitator, be located on agitator
The high-order dosing tank at end continuously stably adds 80 mesh to sieve magnesium metal slag powder or calcium hydroxide to agitator, and addition is dirty
2/1000ths of water, after ph value is adjusted to 12, agitator transports row with 150-300 per minute, when stirring runs 3 minutes,
Agitator water is full, agitated after sewage spill into a heavy pond from the spout hole of agitator, a heavy pond sewage fully precipitate after
It is colorless and odorless clear water, overflow can enter middle water cistern, meet the demand of general papermaking recycle-water；
2. to requiring higher recycle-water, the sewage that a heavy pond can have been precipitated, it is pumped into another agitator with sewage, height
Position dosing tank adds aluminum sulfate or aluminum chloride, addition be the sewage having precipitated ten thousand/, polyacrylamide addition be
The ten thousand of the sewage having precipitated/0. 5, agitator transports row with 150-300 per minute, when stirring runs 3 minutes, ph value
Control 7, agitator water is full, and sewage spills into second pond from the spout hole of agitator, second pond sewage after fully precipitation
It is colorless and odorless reuse clear water, overflow enters cistern, meets the demand reuse water of any papermaking；
3., when the sludge accumulation of a heavy pond and second pond arrives a certain amount of, available mud is pumped into reconciles pond, to discharge mud
The drug effect of middle residual；The mud reconciled in pond is pumped into sludge dehydration device with mud according to accumulation in good time, completes to be dehydrated
Mud formed mud preliminary product, carry out drying；And produced desliming sewage returns again again after carrying out sludge dewatering
Return to conciliation pond to be processed.
The technique of its plain boiled water exploitation and control is:
1. by sewage from sewage draining exit discharge, through slurry reclaim net filtration after sewage enter collecting pit, then through sewage pump by its
In suction agitator, the high-order dosing tank being located at agitator upper end continuously adds aluminum sulfate, aluminum chloride or polypropylene to agitator
Amide, agitator transports row with 150-300 per minute, and when stirring runs 3 minutes, ph value controls 7, and agitator water is full, dirt
Water spills into sedimentation tank from the spout hole of agitator, and the spout hole in sewage autoprecipitation pond after precipitation overflows water water-retention in flowing into
Pond, the middle water in cistern has been colorless and odorless clear water, can meet the demand of any papermaking；
2. the white clay mud of collecting pit and sedimentation tank is pumped into white clay filter pressing or gravity separator, divides through filter pressing or gravity
Form white clay reuse after dehydration, and then define recycle-water after filter pressing or Gravity Separation.
The invention has the beneficial effects as follows: because innovation is using novel segmentation comprehensive processing technique, craft science is rationally, dirty
Water process thoroughly, achieves solid-liquid from black liquor to plain boiled water and entirely recycles zero-emission, that is, solve secondary pollution, and do not affect paper
The preparation quality opened, the value of the product of the higher-value developed is far above the cost of controlling input and the value of papermaking, becomes useless
For treasured, thus significantly reducing production cost.
Brief description: Fig. 1 is the waste water control process chart of the present invention
Fig. 2 is the medium wastewater governance flowchart figure of the present invention
Fig. 3 is the process chart of the recycling white clay of the present invention
Specific embodiment: embodiment 1: as shown in figure 1, (one) its black liquor exploitation and control technique is:
1. black liquor is discharged from black liquor sewage draining exit, enter black liquor after processing through desilting ditch and store up pond, after abundant precipitation, use
By in its suction agitator, aluminum sulfate solution is added in agitator sewage pump by sewage pump simultaneously, aluminum sulfate solution addition
For the 1 16 of black liquor, start agitator simultaneously and be stirred, when ph value reaches 3, the residual alkali in black liquor and aluminum sulfate
Solution chemical combination is aluminium hydroxide, and lignin is precipitated；
2. being continuously added to the black liquor precipitating and aluminum sulfate solution, completes black liquor the overflowing along agitator reacted
Discharge orifice flows into centrifuge, sets terylene 200 mesh filter cloth in centrifuge, and after black liquor enters centrifuge, centrifuge starts, and separates first
Go out white crystalline body aluminium hydroxide；And the liquid being mixed with lignin is then separated, enters into and there is gravitational settling function
Pressure filter, obtains dehydration lignin through filter pressing；Pressure filter Gravity Separation reaches can be after filter pressing concentration, and the liquid being press-filtered out is together with weight
The liquid that power is isolated flows into evaporation concentrator together, is condensed into the pectin product of variable concentrations as needed；Concentrate pectin institute
The water vapour producing carries out drying utilization, and sharp used water vapour is reduced to cooling water, then is back to production cycle water；
Embodiment 2: as shown in Fig. 2 (two) its medium wastewater exploitation and control technique is:
1. sewage is discharged from sewage draining exit, blocks grid through floating thing, slurry recycling network enters desilting ditch after processing, then through desilting ditch
After precipitation process, enter conciliation pond, after reconciling through abundant precipitation, with sewage pump by its suction agitator, be located on agitator
The high-order dosing tank at end continuously stably adds 80 mesh to sieve magnesium metal slag powder or calcium hydroxide to agitator, and addition is dirty
2/1000ths of water, after ph value is adjusted to 12, agitator transports row with 150-300 per minute, when stirring runs 3 minutes,
Agitator water is full, agitated after sewage spill into a heavy pond from the spout hole of agitator, a heavy pond sewage fully precipitate after
It is colorless and odorless clear water, overflow can enter middle water cistern, meet the demand of general papermaking recycle-water；
2. to requiring higher recycle-water, the sewage that a heavy pond can have been precipitated, it is pumped into another agitator with sewage, height
Position dosing tank adds aluminum sulfate or aluminum chloride, addition be the sewage having precipitated ten thousand/, polyacrylamide addition be
The ten thousand of the sewage having precipitated/0. 5, agitator transports row with 150-300 per minute, when stirring runs 3 minutes, ph value
Control 7, agitator water is full, and sewage spills into second pond from the spout hole of agitator, second pond sewage after fully precipitation
It is colorless and odorless reuse clear water, overflow enters cistern, meets the demand reuse water of any papermaking；
3., when the sludge accumulation of a heavy pond and second pond arrives a certain amount of, available mud is pumped into reconciles pond, to discharge mud
The drug effect of middle residual；The mud reconciled in pond is pumped into sludge dehydration device with mud according to accumulation in good time, completes to be dehydrated
Mud formed mud preliminary product, carry out drying；And produced desliming sewage returns again again after carrying out sludge dewatering
Return to conciliation pond to be processed.
Embodiment 3: as shown in figure 3, the technique of plain boiled water exploitation and control is: 1. sewage is discharged from sewage draining exit, reclaim through slurry
Sewage after net filtration enters collecting pit, then through sewage pump by its suction agitator, is located at the high-order dosing of agitator upper end
Groove continuously adds aluminum sulfate, aluminum chloride or polyacrylamide to agitator, and agitator transports row with 150-300 per minute, when stirring
When mixing operation 3 minutes, ph value controls 7, and agitator water is full, and sewage spills into sedimentation tank from the spout hole of agitator, through precipitating
The spout hole in sewage autoprecipitation pond afterwards overflows water cistern in flowing into, and the middle water in cistern has been colorless and odorless clear water, can
Meet the demand of any papermaking；
2. the white clay mud of collecting pit and sedimentation tank is pumped into white clay filter pressing or gravity separator, divides through filter pressing or gravity
Form white clay reuse after dehydration, and then define recycle-water after filter pressing or Gravity Separation.
Embodiment 4: as shown in Figure 1, Figure 2, Figure 3 shows, the plain boiled water of its non-recovery can enter middle section water and be processed, and unavailable
To clean black liquor, in case adversely affecting to black liquor recovery.
Embodiment 5: as shown in figure 1, its white crystalline body aluminium hydroxide, also can be able to use by oneself as industrial goods, its market
Valency is usually more than 3 times of aluminum sulfate.
After lignin dries pulverizing 120 mesh being press-filtered out sieves, can be used for the reinforcing agent of rubber industry, part replaces high resistance to
Mill carbon black, has good physical and chemical stability, and lightweight, resistance to stretching is drawn, adds the good advantage of a little performances.
Concentrate out the pectin product of variable concentrations, for the natural plants pectin of no chemical composition, environmental protection, can be used for wood
The bonding coating of material processing, building materials, ceramic bonding, may replace the chemical resin glue widely adopting, no chemical contamination.
Embodiment 6: as shown in figure 1, the Treatment process of its medium wastewater and plain boiled water be equally applicable to recycled writing paper sewage disposal,
Multiple trade effluents and the process of sanitary sewage disposal, rivers composite wastewater.
Embodiment 7: as shown in Figure 1 and Figure 2, the capacity reconciling pond is a discharge capacity more than production cycle；A number heavy pond
Capacity with No. two heavy ponds is the discharge capacity of a cycle；The capacity of agitator is to produce the blowdown flow rate amount of 3 minutes.
Claims (3)
1. a kind of papermaking wastewater exploitation and control method it is characterised in that:
(1) its black liquor exploitation and control technique is:
1. black liquor is discharged from black liquor sewage draining exit, enter black liquor after processing through desilting ditch and store up pond, after abundant precipitation, use sewage
By in its suction agitator, aluminum sulfate solution is added in agitator pump by sewage pump simultaneously, and aluminum sulfate solution addition is black
The 1 16 of liquid, starts agitator simultaneously and is stirred, when ph value reaches 3, the residual alkali in black liquor and aluminum sulfate solution
Chemical combination is aluminium hydroxide, and lignin is precipitated；
2. being continuously added to the black liquor precipitating and aluminum sulfate solution, completes the black liquor that the reacts spout hole along agitator
Flow into centrifuge, in centrifuge, set terylene 200 mesh filter cloth, after black liquor enters centrifuge, centrifuge starts, and isolates white first
Color crystalline solid aluminium hydroxide；And the liquid being mixed with lignin is then separated, enter into the filter pressing with gravitational settling function
Machine, obtains dehydration lignin through filter pressing；Pressure filter Gravity Separation reaches can be after filter pressing concentration, and the liquid being press-filtered out divides together with gravity
The liquid separating out flows into evaporation concentrator together, is condensed into the pectin product of variable concentrations as needed；Concentrate pectin to be produced
Water vapour carry out dry utilize, sharp used water vapour is reduced to cooling water, then is back to production cycle water；
(2) its medium wastewater exploitation and control technique is:
1. sewage is discharged from sewage draining exit, blocks grid through floating thing, slurry recycling network enters desilting ditch after processing, then through desilting ditch precipitation
After process, enter conciliation pond, after reconciling through abundant precipitation, with sewage pump by its suction agitator, be located at agitator upper end
High-order dosing tank continuously stably adds 80 mesh to sieve magnesium metal slag powder or calcium hydroxide to agitator, and addition is sewage
2/1000ths, after ph value is adjusted to 12, agitator transports row with 150-300 per minute, when stirring runs 3 minutes, stirring
Device water is full, agitated after sewage spill into a heavy pond from the spout hole of agitator, a heavy pond sewage fully precipitate after be no
The tasteless clear water of color, overflow can enter middle water cistern, meet the demand of general papermaking recycle-water；
2. to requiring higher recycle-water, the sewage that a heavy pond can have been precipitated, it is pumped into another agitator with sewage, high-order add
Drug slot adds aluminum sulfate or aluminum chloride, addition be sewage precipitate ten thousand/, polyacrylamide addition is for precipitating
5th/10000ths of good sewage, agitator transports row with 150-300 per minute, and when stirring runs 3 minutes, ph value controls
7, agitator water is full, and sewage spills into second pond from the spout hole of agitator, and second pond sewage has been nothing after abundant precipitation
Color tasteless reuse clear water, overflow enters cistern, meets the demand reuse water of any papermaking；
3., when the sludge accumulation of a heavy pond and second pond arrives a certain amount of, available mud is pumped into reconciles pond, residual in mud to discharge
The drug effect stayed；The mud reconciled in pond is pumped into sludge dehydration device with mud according to accumulation in good time, completes the dirt being dehydrated
Mud forms mud preliminary product, carries out drying；And produced desliming sewage backs within again after carrying out sludge dewatering
Reconcile pond to be processed.
2. a kind of papermaking wastewater exploitation and control method according to claim 1 is it is characterised in that its plain boiled water exploitation and control
Technique is: 1. discharges sewage from sewage draining exit, enters collecting pit through the sewage that slurry reclaims after net filtration, then taken out through sewage pump
Enter in agitator, the high-order dosing tank being located at agitator upper end continuously adds aluminum sulfate, aluminum chloride or polyacrylamide to agitator
Amine, agitator transports row with 150-300 per minute, and when stirring runs 3 minutes, ph value controls 7, agitator water completely, sewage
Spill into sedimentation tank from the spout hole of agitator, the spout hole in sewage autoprecipitation pond after precipitation overflows water water-retention in flowing into
Pond, the middle water in cistern has been colorless and odorless clear water, can meet the demand of any papermaking；
2. the white clay mud of collecting pit and sedimentation tank is pumped into white clay filter pressing or gravity separator, takes off through filter pressing or Gravity Separation
Form white clay reuse after water, and then define recycle-water after filter pressing or Gravity Separation.
3. a kind of papermaking wastewater exploitation and control method according to claim 1 is it is characterised in that the plain boiled water of non-recovery can be arranged
Enter middle section water to be processed, and should not be used to clean black liquor, in case adversely affecting to black liquor recovery.
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| CN201410507595.XA CN104310683B (en) | 2014-09-18 | 2014-09-18 | Development and control method of papermaking wastewater |
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| CN1139167A (en) * | 1996-02-02 | 1997-01-01 | 于心让 | Closed and semi-closed equipment and method for treating sewage of paper mill |
| CN1378981A (en) * | 2001-08-10 | 2002-11-13 | 林连山 | Process for treating intermediate paper-making sewage |
| US6830696B1 (en) * | 2003-12-01 | 2004-12-14 | University Of Florida Research Foundation, Inc. | Treatment of spent pulping liquor with lignin separation to recover alkali pulping chemicals in manufacture of paper pulp |
| WO2006038072A1 (en) * | 2004-09-07 | 2006-04-13 | K.I. System Co., Ltd. | Method of treating black liquor |
| CN1270982C (en) * | 2004-11-08 | 2006-08-23 | 彭仲辉 | Process for comprensive treating waste water of paper making by grass pulp |
| JP2007070784A (en) * | 2005-09-07 | 2007-03-22 | Ki System:Kk | Method for treating black liquor |
| CN103086534B (en) * | 2011-10-31 | 2015-02-18 | 金东纸业（江苏）股份有限公司 | Whitewater processing method |
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