CN1292998C - Method for handling waste water of paper making industry - Google Patents
Method for handling waste water of paper making industry Download PDFInfo
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- CN1292998C CN1292998C CNB031127746A CN03112774A CN1292998C CN 1292998 C CN1292998 C CN 1292998C CN B031127746 A CNB031127746 A CN B031127746A CN 03112774 A CN03112774 A CN 03112774A CN 1292998 C CN1292998 C CN 1292998C
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- waste water
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Abstract
The present invention relates to a method for treating waste water from paper making, which belongs to the technical field of waste water treatment. The method mainly comprises: filtered waste water enters a primary settling pool to remove suspended substances, sludge is discharged to a mixing tank, and the waste water enters an aeration pool and then a sludge return tank of a middle settling pool. A metering pump is adopted to continuously add bleaching water into the sludge return tank of the middle settling pool, the concentration of the bleaching water is 8 to 12 wt%, and the addition quantity of the bleaching water is from 0.001 to 0.0015 wt%. Then, the waste water passes through the middle settling pool and the final settling pool and is recovered by a sludge pump to be pumped back to a sludge thickening pool, and upper clear liquid can be discharged by reaching the standard. The sludge return tank of the middle settling pool is additionally arranged between the aeration pool and the settling pool, and the bleaching water with a certain proportion is added into the sludge return tank of the middle settling pool, so that filamentous bacteria can be killed effectively to make sludge maintain favorable settling properties. The sludge settling ratio SV can be controlled to be smaller than 75%, and sludge bulking can be effectively controlled. COD of effluent water can be decreased to 96 mg/l, and the quantity of effluent water can be stable.
Description
Technical field:
The present invention relates to a kind of technological process for the treatment of papermaking method, belong to technical field of sewage.
Technical background:
Before the present invention makes, common wastewater treatment be with the waste water of slurrying and papermaking through pipe-line transportation to the waste water treatment plant, through conservancy trash machine, remove some big foreign material earlier with strainer filtering.Waste water after the filtration enters preliminary sedimentation tank, preliminary sedimentation tank central authorities settle a flocculation cabin, there are two agitators ceaselessly to mix in the cabin, produce mechanical throwing out, waste water enters the flocculation cabin after stirring, and the precipitation main body that flows into preliminary sedimentation tank by gravity again from the flocculation cabin is done sedimentation, the preliminary sedimentation tank leaving water temperature(LWT) must be controlled at 15-35 ℃, if water temperature surpasses 35 ℃,, must open cooling tower and be cooled to water temperature less than 35 ℃ for avoiding aeration tank bacterium death; Through the waste water behind the preliminary sedimentation tank, removed most suspended substance, enter the aeration tank again, aerator is housed at the bottom of the pond, and the air that is produced by air compressor machine enters the aeration tank by main tracheae, by the high-speed cutting of aerator blade, equably be distributed in waste water with the form of small bubbles pressurized air, improve the content of dissolved oxygen in the waste water, the concentration of dissolved oxygen (DO) is 1～2mg/l in the control aeration tank, regulates airshed according to the concentration of dissolved oxygen automatically by control system of air compressor.Add nutrition agent at aeration tank inlet, used nutrition agent is nitrogenous 46% urea and phosphorous 18% phosphoric acid diamines.The adding of nutrition agent will improve the activity of aeration tank bacterium, play the effect of degrading waste water pollutent, remove a large amount of COD and BOD.Waste water after the biochemical treatment is again through medium sediment pool, final deposition pool, and by the action of gravity precipitation, biological sludge is deposited in the bottom, draws back sludge thickener by the recovery sludge pump and is for further processing, and upper clear liquid gets final product qualified discharge.
When adopting above-mentioned technical process to handle waste water, in summer high-temperature season, the a large amount of hyperplasia of thread fungus, sludge settling property is poor in the aeration tank, sludge settling ratio SV serious sludge bulking takes place in the aeration tank, and the sludge bulking time length is longer up to more than 95%, wayward, cause effluent quality to exceed standard.
Summary of the invention:
The objective of the invention is to overcome above-mentioned weak point, thereby provide a kind of on original technical process basis, between aeration tank and medium sediment pool, increase medium sediment pool returned sluge groove, and in this groove, add drift ice, thereby can effectively kill thread fungus, make mud keep good settleability, and can effectively control sludge bulking, and can make a kind of technological process for the treatment of papermaking method of stable effluent quality.
Main solution of the present invention is achieved in that
Its technical process is as follows: after waste water after filtering enters the cabin stirring of flocculating in the preliminary sedimentation tank, removed most suspended substance, mud discharging enters the aeration tank again to tempering tank, high-speed cutting by aerator blade in the aeration tank, the pressurized air that is produced by air compressor machine is distributed in the waste water with the form of small bubbles equably, improve the content of dissolved oxygen in the waste water, and at aeration tank inlet adding nutrition agent, the adding of nutrition agent will improve the activity of aeration tank bacterium, play the effect of degrading waste water pollutent, it is characterized in that waste water after biochemical treatment is again through medium sediment pool returned sluge groove, in medium sediment pool returned sluge groove, adopt volume pump to add drift ice continuously, drift ice concentration is: 8-12% (weight percentage), the addition of drift ice is: 0.001-0.0015% (weight percentage), the waste water of handling through medium sediment pool returned sluge groove is again through medium sediment pool, final deposition pool, precipitate by action of gravity, biological sludge is deposited in the bottom, draw back sludge thickener by the recovery sludge pump and further handle, upper clear liquid gets final product qualified discharge.
Compared with the prior art the present invention has the following advantages:
Technical process of the present invention is simple, owing between aeration tank and medium sediment pool, increased medium sediment pool returned sluge groove, in medium sediment pool returned sluge groove, add a certain proportion of drift ice, thereby can effectively kill thread fungus, make mud keep good settleability, sludge settling ratio SV can be controlled at below 75%, can effectively control sludge bulking, water outlet COD can drop to 96mg/l, and can make stable effluent quality, reaches discharging standards.
Description of drawings:
Fig. 1 is a process flow sheet of the present invention;
Embodiment:
Embodiment during following the present invention incites somebody to action in conjunction with the accompanying drawings is further described:
The equipment that is adopted among the present invention is conventional equipment, and starting material are market and purchase.
Embodiment 1:
Technical process of the present invention is as follows:
The present invention adopts the waste water process pipe-line transportation of slurrying and papermaking to the waste water treatment plant, through conservancy trash machine, removes some big foreign material with strainer filtering earlier.Waste water after the filtration enters preliminary sedimentation tank, preliminary sedimentation tank central authorities settle a flocculation cabin, there are two agitators ceaselessly to mix in the cabin, produce mechanical throwing out, waste water enters the flocculation cabin after stirring, and the precipitation main body that flows into preliminary sedimentation tank by gravity again from the flocculation cabin is done sedimentation, the preliminary sedimentation tank leaving water temperature(LWT) must be controlled at 15-35 ℃, if water temperature surpasses 35 ℃,, must open cooling tower and be cooled to water temperature less than 35 ℃ for avoiding aeration tank bacterium death; Water outlet PH is controlled between the 6-9, as PH＜6 o'clock, must add NaOH and regulate.Through the waste water behind the preliminary sedimentation tank, removed most suspended substance, enter the aeration tank again, aerator is housed at the bottom of the pond, and the air that is produced by air compressor machine enters the aeration tank by main tracheae, by the high-speed cutting of aerator blade, equably be distributed in waste water with the form of small bubbles pressurized air, improve the content of dissolved oxygen in the waste water, the concentration of dissolved oxygen (DO) is 1～2mg/l in the control aeration tank, regulates airshed according to the concentration of dissolved oxygen automatically by control system of air compressor.Inlet adds nutrition agent in the aeration tank, used nutrition agent is nitrogenous 46% urea and phosphorous 18% phosphoric acid diamines, add-on will draw from the empirical relationship of BOD effect, BOD: N: P=100: 5: 1, the adding of nutrition agent will improve the activity of aeration tank bacterium, play the effect of degrading waste water pollutent, remove a large amount of COD and BOD.Waste water after the biochemical treatment enters medium sediment pool returned sluge groove and handles, in medium sediment pool returned sluge groove, adopt volume pump to add drift ice continuously, drift ice concentration is: 8%, the addition of drift ice is 0.001% (weight percentage), the waste water of handling through medium sediment pool returned sluge groove is again through medium sediment pool, whole mud sump, and by the action of gravity precipitation, biological sludge is deposited in the bottom, draw back sludge thickener by the recovery sludge pump and be for further processing, upper clear liquid gets final product qualified discharge.In the present embodiment, its sludge settling specific energy is controlled at below 75%, and water outlet COD can be controlled at 96mg/l.
Embodiment 2:
Adopt the technical process in the embodiment of the invention 1 that waste water is handled, drift ice concentration is 10% o'clock, and its drift ice addition is: 0.0012% (weight percentage), adopt volume pump to make an addition to medium sediment pool returned sluge groove continuously.Sludge settling ratio SV can be controlled at (original art breading waste water, SV reach 98%) below 75%, and water outlet COD drops to 96mg/l (original art breading waste water, its water outlet COD is 128mg/l), and sludge settling property is good, and the sludge bulking phenomenon does not take place.
Embodiment 3:
The present invention adopts the technical process among the embodiment 1,2 that waste water is handled, and drift ice concentration is: 12%, and its drift ice addition is: 0.0015% (weight percentage).Waste water after handle the aeration tank adopts volume pump to make an addition to medium sediment pool returned sluge groove continuously, and sludge settling ratio SV can be controlled at 75% equally, and it is good that water outlet COD can be controlled at the 96mg/l sludge settling property, and the sludge bulking phenomenon does not take place equally.
The equipment that is adopted among the present invention is conventional equipment, and drift ice is that market is buied.
Claims (1)
1, a kind of technological process for the treatment of papermaking method, after employing waste water after filtering enters the cabin stirring of flocculating in the preliminary sedimentation tank, removed most suspended substance, mud discharging is to tempering tank, enter the aeration tank again, high-speed cutting by aerator blade in the aeration tank, the pressurized air that is produced by air compressor machine is distributed in the waste water with the form of small bubbles equably, improve the content of dissolved oxygen in the waste water, and at aeration tank inlet adding nutrition agent, the adding of nutrition agent will improve the activity of aeration tank bacterium, play the effect of degrading waste water pollutent, it is characterized in that waste water after biochemical treatment is again through medium sediment pool returned sluge groove, in medium sediment pool returned sluge groove, adopt volume pump to add drift ice continuously, the addition of drift ice is: 0.001-0.0015 weight %, drift ice concentration is: 8-12 weight %, the waste water of handling through medium sediment pool returned sluge groove is again through medium sediment pool, final deposition pool, precipitate by action of gravity, biological sludge is deposited in the bottom, draw back sludge thickener by the recovery sludge pump and further handle, upper clear liquid gets final product qualified discharge.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB031127746A CN1292998C (en) | 2003-01-25 | 2003-01-25 | Method for handling waste water of paper making industry |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB031127746A CN1292998C (en) | 2003-01-25 | 2003-01-25 | Method for handling waste water of paper making industry |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1431158A CN1431158A (en) | 2003-07-23 |
| CN1292998C true CN1292998C (en) | 2007-01-03 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB031127746A Expired - Lifetime CN1292998C (en) | 2003-01-25 | 2003-01-25 | Method for handling waste water of paper making industry |
Country Status (1)
| Country | Link |
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| CN (1) | CN1292998C (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR102571129B1 (en) * | 2016-06-20 | 2023-08-28 | 솔레니스 테크놀러지스, 엘.피. | Process for treating cellulosic wastewater sludge for production of linerboard and cellulosic ethanol production |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2155720C1 (en) * | 2000-02-02 | 2000-09-10 | Открытое акционерное общество "Центральный научно-исследовательский институт бумаги" | Method of treating waste water from production of fibrous intermediate products for paper and cardboard manufacture |
| RU2160720C2 (en) * | 1998-04-22 | 2000-12-20 | Кооператив "Техпрогресс" | Method of sewage water treatment |
| GB2371296A (en) * | 2001-01-22 | 2002-07-24 | Feralco Sa | Aluminium chloride and zirconium-containing coagulant compositions |
-
2003
- 2003-01-25 CN CNB031127746A patent/CN1292998C/en not_active Expired - Lifetime
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2160720C2 (en) * | 1998-04-22 | 2000-12-20 | Кооператив "Техпрогресс" | Method of sewage water treatment |
| RU2155720C1 (en) * | 2000-02-02 | 2000-09-10 | Открытое акционерное общество "Центральный научно-исследовательский институт бумаги" | Method of treating waste water from production of fibrous intermediate products for paper and cardboard manufacture |
| GB2371296A (en) * | 2001-01-22 | 2002-07-24 | Feralco Sa | Aluminium chloride and zirconium-containing coagulant compositions |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1431158A (en) | 2003-07-23 |
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Address after: 214187 No. 43 Zhongxing West Road, Luoyang Town, Jiangsu, Wuxi Patentee after: WUXI RONGCHENG ENVIRONMENTAL PROTECTION TECHNOLOGY CO.,LTD. Address before: 214187 No. 43 Zhongxing West Road, Luoyang Town, Jiangsu, Wuxi Patentee before: WUXI LONG CHEN PAPER CO.,LTD. |
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Granted publication date: 20070103 |
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| CX01 | Expiry of patent term |