CN111825234A - Viscose fiber production wastewater pretreatment neutralization process method - Google Patents
Viscose fiber production wastewater pretreatment neutralization process method Download PDFInfo
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- CN111825234A CN111825234A CN201910301532.1A CN201910301532A CN111825234A CN 111825234 A CN111825234 A CN 111825234A CN 201910301532 A CN201910301532 A CN 201910301532A CN 111825234 A CN111825234 A CN 111825234A
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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
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
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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
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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
- C02F2001/007—Processes including a sedimentation step
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- Hydrology & Water Resources (AREA)
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- Environmental & Geological Engineering (AREA)
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Abstract
The invention relates to a pretreatment and neutralization process method for viscose fiber production wastewater, which comprises the following steps: (1) collecting the viscose fiber acid wastewater in a centralized manner, and stirring; collecting alkaline wastewater in a centralized manner, and stirring; (2) pumping the acidic wastewater into a first reaction tank, and adding calcium carbonate slurry into the first reaction tank; (3) the acid water after the reaction enters a second reaction tank, and the lime slurry is added after the alkaline wastewater is mixed with the acid water; (4) and (4) after the reaction, the wastewater enters a third reaction tank, and sodium hydroxide alkaline liquor is supplemented for neutralization to adjust the pH value. The method adopts a multi-stage neutralization and sedimentation mode to neutralize the pretreatment of the viscose fiber production wastewater, can reduce suspended matters in the wastewater, improve the neutralization effect, can reduce the operation cost, and has guiding significance for treating the viscose fiber production wastewater.
Description
Technical Field
The invention relates to a pretreatment neutralization process method for viscose fiber production wastewater, belonging to the field of viscose fiber production, in particular to the field of treatment of viscose fiber production wastewater.
Background
The acidic waste water discharged from viscose fiber factory contains sulfuric acid, sodium sulfate, zinc sulfate, etc., and the alkaline waste water contains sodium hydroxide, sulfide, etc., and the total water quantity is that the acidic waste water exceeds the alkaline waste water, and the amount of sulfuric acid is greater than that of alkali. The general processing mode is as follows: acid wastewater is discharged to a sewage treatment plant and is uniformly treated after being mixed with other sewage, the water quantity and the water quality fluctuate randomly, the subsequent biochemical treatment effect is often influenced when the wastewater enters a biochemical system, the dosage is large when the wastewater is neutralized by alkali, and the cost is high. With the increasingly strict industry competition and environmental protection policy, viscose enterprises pay attention to the treatment process of production wastewater, update the technical scheme on pretreatment, and strive to reduce the cost.
Disclosure of Invention
The invention aims to solve the technical problem of providing a neutralization process method for pretreating viscose fiber production wastewater, which is feasible, stable and effective in process, and enables a sewage treatment system to improve the operation efficiency and reduce the operation cost.
The technical scheme for solving the technical problems is as follows: a pretreatment and neutralization process method for viscose fiber production wastewater comprises the following steps:
(1) collecting the viscose fiber acid wastewater in a centralized manner, and stirring; collecting alkaline wastewater in a centralized manner, and stirring;
(2) pumping the acidic wastewater into a first reaction tank, and adding calcium carbonate slurry into the first reaction tank;
(3) the mixed and precipitated acidic water enters a second reaction tank, and the alkaline wastewater is mixed with the acidic water and then added with lime slurry;
(4) after mixing and precipitation, the wastewater enters a third reaction tank, and sodium hydroxide lye is supplemented for neutralization to adjust the pH value;
(5) the mixed and precipitated neutral alkaline wastewater enters an intermediate tank and then enters a biochemical system.
The viscose fiber acid wastewater is fiber washing water containing sulfuric acid discharged in the viscose fiber preparation process, and is mainly the acid water of a refiner in a spinning workshop and other positions for discharging acid and acid water; the alkaline wastewater is fiber washing water containing sodium hydroxide discharged in the viscose fiber preparation process, and is mainly alkaline water of a refiner in a spinning workshop and other positions for discharging alkali and alkaline water.
The calcium carbonate slurry is calcium carbonate CaCO3Mixing the fines with water to form a slurry, said lime slurry being slaked lime Ca (OH)2The powder is mixed with water to form slurry, and the sodium hydroxide lye is a sodium hydroxide NaOH aqueous solution in a liquid state.
And (3) carrying out acid-base reaction in the reaction tanks in the steps (2), (3) and (4), then entering a sedimentation tank, naturally settling by virtue of the action of gravity, continuously flowing the supernatant backwards, and timely discharging sludge by sedimentation.
And (3) adjusting the pH value of the reaction tank I in the step (2) to 5.0-5.5 by using calcium carbonate slurry, adjusting the pH value of the reaction tank II in the step (3) to 5.5-6.5 by using lime slurry, and adjusting the pH value of the reaction tank III in the step (4) to 7.0-7.5 by using lime slurry.
And a PH meter is arranged on the effluent of the reaction tank, and is interlocked with the addition of the calcium carbonate slurry, the lime slurry and the alkali liquor.
The reaction tank is provided with the pipeline mixer on the water inlet pipeline, which is beneficial to uniformly and fully mixing the calcium carbonate slurry, the lime slurry and the acidic wastewater.
The method adjusts the pH value according to the property of the calcium powder, adopts a multi-stage neutralization and sedimentation mode to neutralize the pretreatment of the viscose fiber production wastewater, can realize the reduction of suspended substances in the wastewater, improves the neutralization effect, and can reduce the operation cost. Provides a process treatment method which is economical and practical and saves the operating cost, and is suitable for producing the acid water by the viscose.
Detailed Description
A pretreatment and neutralization process method for viscose fiber production wastewater comprises the following steps: (1) collecting the viscose fiber acid wastewater in a centralized manner, and stirring; collecting alkaline wastewater in a centralized manner, and stirring; (2) pumping the acidic wastewater into a first reaction tank, and adding calcium carbonate slurry into the first reaction tank; (3) the mixed and precipitated acidic water enters a second reaction tank, and the alkaline wastewater is mixed with the acidic water and then added with lime slurry; (4) after mixing and precipitation, the wastewater enters a third reaction tank, and sodium hydroxide lye is supplemented for neutralization to adjust the pH value; (5) the mixed and precipitated neutral alkaline wastewater enters an intermediate tank and then enters a biochemical system.
The acid water is collected in a centralized way and then pumped into a reaction tank I, and calcium carbonate CaCO is used3And (3) mixing the powder with water to form calcium carbonate slurry, and adjusting the pH value to 5.0-5.5 by using the calcium carbonate slurry in the first reaction tank.
After mixing and precipitation, the acidity overflows to a second reaction tank, alkaline water is also pumped into the second reaction tank, and after mixing, the acid and alkaline water is mixed by hydrated lime Ca (OH)2Mixing the powder with water to form lime slurry, and regulating the pH value to 5.5-6.5 with the lime slurry in the second reaction tank.
And (4) after mixing and precipitation, enabling the wastewater to enter a third reaction tank, and continuously neutralizing and adjusting the pH value to 7.0-7.5 by using liquid sodium hydroxide (NaOH) according to the water quantity and the pH value.
And (4) carrying out acid-base reaction in the reaction tanks in the steps (2), (3) and (4), then entering a sedimentation tank, and naturally settling under the action of gravity. The supernatant continuously flows backwards, and the precipitate is discharged to a sludge tank in time.
And a PH meter is arranged on the effluent of each reaction tank, regulating valves are arranged on the calcium carbonate slurry, lime slurry and alkali liquor adding pipelines, and the adding amount is controlled according to the interlocking regulation of the PH value.
In order to uniformly and fully mix the calcium carbonate slurry, the lime slurry and the acidic wastewater, pipeline mixers are arranged on the first water inlet pipeline and the second water inlet pipeline of the reaction tank, and the mixture is fed into the reaction tank.
After multi-stage neutralization and sedimentation, suspended matters in the wastewater are reduced, and the neutralization effect is improved; the usage amount of the liquid caustic soda is reduced, so that the operation cost is reduced.
Claims (7)
1. A pretreatment and neutralization process method for viscose fiber production wastewater is characterized by comprising the following steps:
(1) collecting the viscose fiber acid wastewater in a centralized manner, and stirring; collecting alkaline wastewater in a centralized manner, and stirring;
(2) pumping the acidic wastewater into a first reaction tank, and adding calcium carbonate slurry into the first reaction tank;
(3) the mixed and precipitated acidic water enters a second reaction tank, and the alkaline wastewater is mixed with the acidic water and then added with lime slurry;
(4) after mixing and precipitation, the wastewater enters a third reaction tank, and sodium hydroxide lye is supplemented for neutralization to adjust the pH value;
(5) the mixed and precipitated neutral alkaline wastewater enters an intermediate tank and then enters a biochemical system.
2. The viscose fiber production wastewater pretreatment neutralization process method according to claim 1, characterized in that: the viscose fiber acid wastewater is fiber washing water containing sulfuric acid discharged in the viscose fiber preparation process, and is mainly the acid water of a refiner in a spinning workshop and other positions for discharging acid and acid water; the alkaline wastewater is fiber washing water containing sodium hydroxide discharged in the viscose fiber preparation process, and is mainly alkaline water of a refiner in a spinning workshop and other positions for discharging alkali and alkaline water.
3. The viscose fiber production wastewater pretreatment neutralization process method according to claim 1, characterized in that: the calcium carbonate slurry is calcium carbonate CaCO3Mixing the fines with water to form a slurry, said lime slurry being slaked lime Ca (OH)2The powder is mixed with water to form slurry, and the sodium hydroxide lye is a sodium hydroxide NaOH aqueous solution in a liquid state.
4. The viscose fiber production wastewater pretreatment neutralization process method according to claim 1, characterized in that: and (3) carrying out acid-base reaction in the reaction tanks in the steps (2), (3) and (4), then entering a sedimentation tank, and naturally settling under the action of gravity.
5. The viscose fiber production wastewater pretreatment neutralization process method according to claims 1 and 4, characterized in that: and (3) adjusting the pH value of the reaction tank I in the step (2) to 5.0-5.5 by using calcium carbonate slurry, adjusting the pH value of the reaction tank II in the step (3) to 5.5-6.5 by using lime slurry, and adjusting the pH value of the reaction tank III in the step (4) to 7.0-7.5 by using liquid caustic soda.
6. The viscose fiber production wastewater pretreatment neutralization process method according to claim 4, characterized in that: and a PH meter is arranged on the effluent of the reaction tank, and is interlocked with the addition of the calcium carbonate slurry, the lime slurry and the alkali liquor.
7. The viscose fiber production wastewater pretreatment neutralization process method according to claims 1, 3 to 5, characterized in that: the reaction tank is provided with the pipeline mixer on the water inlet pipeline, so that uniform and sufficient mixing is facilitated.
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| CN201910301532.1A CN111825234A (en) | 2019-04-16 | 2019-04-16 | Viscose fiber production wastewater pretreatment neutralization process method |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2174107C1 (en) * | 2000-02-29 | 2001-09-27 | Тверской государственный технический университет | Waste water neutralization and cleaning process |
| CN102603112A (en) * | 2011-12-21 | 2012-07-25 | 浙江东发环保工程有限公司 | Biochemical treatment technology for viscose waste water with physico-chemical method and CASS (Cyclic Activated Sludge System) method |
| CN105347571A (en) * | 2015-12-03 | 2016-02-24 | 唐山三友集团兴达化纤有限公司 | Method for treating viscose fiber production wastewater with alkaline residue |
| CN205740619U (en) * | 2016-05-17 | 2016-11-30 | 青岛北方节能环保有限公司 | A kind of Waste acid treating device |
| CN107902855A (en) * | 2017-11-07 | 2018-04-13 | 宜宾海丝特纤维有限责任公司 | The recovery process of zinc ion is discarded in a kind of viscose rayon production |
| CN109437480A (en) * | 2018-11-23 | 2019-03-08 | 华夏碧水环保科技有限公司 | A kind of viscose fiber wastewater treatment process |
-
2019
- 2019-04-16 CN CN201910301532.1A patent/CN111825234A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2174107C1 (en) * | 2000-02-29 | 2001-09-27 | Тверской государственный технический университет | Waste water neutralization and cleaning process |
| CN102603112A (en) * | 2011-12-21 | 2012-07-25 | 浙江东发环保工程有限公司 | Biochemical treatment technology for viscose waste water with physico-chemical method and CASS (Cyclic Activated Sludge System) method |
| CN105347571A (en) * | 2015-12-03 | 2016-02-24 | 唐山三友集团兴达化纤有限公司 | Method for treating viscose fiber production wastewater with alkaline residue |
| CN205740619U (en) * | 2016-05-17 | 2016-11-30 | 青岛北方节能环保有限公司 | A kind of Waste acid treating device |
| CN107902855A (en) * | 2017-11-07 | 2018-04-13 | 宜宾海丝特纤维有限责任公司 | The recovery process of zinc ion is discarded in a kind of viscose rayon production |
| CN109437480A (en) * | 2018-11-23 | 2019-03-08 | 华夏碧水环保科技有限公司 | A kind of viscose fiber wastewater treatment process |
Non-Patent Citations (1)
| Title |
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| 叶林顺: "《水污染控制工程》", 31 October 2018 * |
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