CN102603112A - Biochemical treatment technology for viscose waste water with physico-chemical method and CASS (Cyclic Activated Sludge System) method - Google Patents
Biochemical treatment technology for viscose waste water with physico-chemical method and CASS (Cyclic Activated Sludge System) method Download PDFInfo
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Abstract
The invention discloses a biochemical treatment technology for viscose waste water with a physico-chemical method and a CASS (Cyclic Activated Sludge System) method, which belongs to the field of the water environment protection and particularly relates to the materialized and biochemical combined treatment technology of acid and alkaline waste water in the viscose industry. The biochemical treatment technology is mainly used for solving the phenomenon that the Zn2<+>, CODcr (chemical oxygen demand) and chroma removal of the viscose waste water is substandard. In the biochemical treatment technology, the flow process comprises acidification analytic stripping, a neutral reaction, flocculation sedimentation and CASS pool biochemistry; CODcr and chroma are lowered by the acidification analytic stripping, and CS2 and H2S gas are precipitated; 10-15% of lime slurry is added for neutralization; a pH value is regulated to 9-10; flocculant and coagulant aid are added; Zn2<+> ions and most suspended matters are removed by the flocculation sedimentation; effluent processed with the physico-chemical method enters a CASS pool biochemical period; and supernate is discharged after the treatment of feeding water for 2-3 hours, aerating for 6-7 hours, precipitating for 0.5-1 hour, draining water for 2-2.5 hours and leaving unused for 0.5-1 hour. The biochemical treatment technology is mainly used for the comprehensive standard discharge treatment for the acid and alkaline waste water in the viscose industry.
Description
Technical field
The invention belongs to the water environment protection field, be specifically related to viscose glue industry technology workshop acidity, the mixed physico-chemical process biochemical process of alkaline waste water combined treatment process.
Background technology
Viscose glue industry technology workshop can be discharged a large amount of acid waste waters in process of production and (mainly contained H
2SO
4, ZnSO
4, Na
2SO
4, its COD
CrAbout 400mg/L) and alkaline waste water (mainly contain NaOH, Na
2S, CS
2, Mierocrystalline cellulose yellow acid fat, its COD
CrAbout 2300mg/L), and the acid waste water amount is 2 times (volume ratios) of alkaline waste water amount approximately, the main polluted factors of mixing back waste water is COD
Cr, pH value, Zn
2+, colourity, suspended substance.Conventional treatment process in more effective with the pH value and the removal suspended substance of waste water, but the Zn in the soda acid composite waste
2+Mainly because of cellulose sulfonate, CS
2The COD that causes
Cr, colourity intractable to qualified discharge (GB8978-96, one-level).
By Intellectual Property in China net (CNIPR) patent search result; Application (patent) number CN200510022481.7 and CN200510022481.7 have proposed the treatment process to acidic waste water of viscose fibre industry; It is main that what adopt is to throw in milk of lime, water body is neutralized; Make water body pass through grid, remove the bigger suspended substance of particle, part sulfide in the aeration stripping water body in the homogeneous pond adds heavy metal precipitator as dezincification agent and water purification agent FeSO
47H
2O throws in milk of lime then, water pH value is adjusted to 7.6～8.8 in neutralization tank, in settling tank, remove sulfide in water, Zn (OH) through deposition
2And suspended substance.Application (patent) number CN200810045909.3 has proposed the method and the equipment thereof of salkali waste, waste gas and zinc-containing water in the production of comprehensive regulation viscose fiber; Its main contents step is to collect waste lye in the viscose fiber production to pack in the tourie; The technology waste gas that will contain hydrogen sulfide and dithiocarbonic anhydride feeds in the above-mentioned tourie, and the neutralizer of collecting after absorbing is subsequent use.The neutralizer input is contained in the waste water of zine ion, with the zine ion reaction, the reaction product post precipitation is removed throw out.Its equipment that comprises comprises absorption filling, receiving tank, neutralization tank, settling tank.
Summary of the invention
The present invention be exactly handle to the mixed comprehensive wastewater of present viscose glue industry acid waste water, alkaline waste water not thorough, to the Zn in the waste water
2+, COD
CrWith color removal phenomenon not up to standard, the creative physico-chemical process biochemical process combined treatment process of proposition.
Characteristics and qualified discharge acid according to the viscose glue industry, alkaline comprehensive wastewater require (GB8978-96, one-level), the invention provides that a kind of viscose glue industry is acid, alkaline comprehensive wastewater is the comprehensive processing technique of viscose fiber waste water.
Physico-chemical process adds CASS method biochemical treatment viscose fiber waster water process; It is characterized in that described physico-chemical process adds CASS method biochemical treatment viscose fiber waster water process and resolves by acidifying that stripping, lime white neutralization, flocculation sediment and CASS method biochemistry realizes, described waste water acidifying resolves that stripping pH value is 2～3, lime white concentration is that 10～15% (weightmeasurement ratios), flocculation sediment pH value are 9～10, CASS method biochemistry cycle is 10～12 hours.
It is in 1.5～2 hours, lime white that the stripping hydraulic detention time is resolved in described acidifying and hydraulic detention time is that 0.5～1 hour, flocculation sediment hydraulic detention time are 4～4.5 hours.
The used flocculation agent PAC of described flocculation sediment (flocculant of polymeric aluminium chloride) solution is that 10～12.5% (with water weight ratio), coagulant aids APAM (anion-polyacrylamide) solution are 0.5～1% (with water weight ratio).
Physico-chemical process adds CASS method biochemical treatment viscose fiber waster water process, comprises following sequence flow:
1, viscose fiber waste water mixes with the alkaline waste water volume ratio by acid waste water at 2: 1, stirs through perforated pipe aerating regulation, makes composite waste pH value between 2～3;
2, the back water outlet is resolved in acidifying, in it, adds the lime white of 10～15% (weightmeasurement ratios), regulates the pH value between 9～10;
3, add flocculation agent and coagulant aids, 600～800 liters/hour of 10～12.5% flocculant solution dosages, 150～200 liters/hour of 0.5～1% coagulant aids solution dosages;
4, the flocculation sediment stage is carried out in the water outlet that adds behind flocculation agent, the coagulant aids;
5, the supernatant water outlet begins the biochemical cycle of CASS pond behind the flocculation sediment;
6, the processing in biochemical 10～12 hours through the CASS pond, the supernatant water-decanting and discharging.
The order in biochemical cycle of described CASS method for water inlet 2～3 hours, aeration 6～7 hours (having intersects in 1 hour) with water inlet, precipitate 0.5～1 hour, strain water 2～2.5 hours, left standstill 0.5～1 hour.
What described aeration adopted is that base fabric is put the variable micro-hole aerator of tubular type in the CASS pond.
The present invention has following beneficial effect:
1, acid waste water is 2 times (volume ratios) of alkaline waste water approximately; Mix with alkaline waste water acid waste water by 2: 1 volume ratios, mix the back waste water ph between 2～3, reach acidifying and resolve the unitary conditional request of stripping process; Need not add s.t. to alkaline waste water, reduce raw material consumption.
2, the stripping process unit is resolved in acidifying, and in pH value 2～3 o'clock, the cellulose sulfonate of bio-refractory can decompose voluntarily, for follow-up CASS pond biochemistry creates conditions, and the inner bottom part aeration through the pond, but stripping goes out to cause COD
CrThe a large amount of CS that increase
2, H
2S gas is removed a large amount of COD in the water
CrAnd colourity, reduce the subsequent technique unit load.
3, add lime white and regulate waste water ph to 9～10, can play two aspect effects, the one, lime white itself is exactly a kind of flocculation agent, can carry out preliminary flocculation sediment to suspended substance in the water; The 2nd, between pH value 9～10, can realize Zn through further flocculation sediment
2+Deposition fully (detection limit below).
4, in the treatment time in biochemical 10～12 hours cycles of CASS method, guaranteed COD
CrRemoval effect, make the terminal water outlet COD of physico-chemical process technological process
CrDrop to 60～90mg/L (because of environment difference in season difference to some extent) by 450～550mg/L.
Description of drawings
Fig. 1 is the schema of technology of the present invention.
1, stripping is resolved in (through the control of pump group) the beginning acidifying in 2: 1 by volume of the acid waste water of viscose glue production plant discharge and alkaline waste water; After perforated pipe aeration stirs; The pH value of composite waste is between 2～3; Cellulose sulfonate in the composite waste decomposes with this understanding voluntarily, and under the situation of water-bed portion aeration, stripping goes out a large amount of CS
2, H
2S gas.
2, water outlet began the lime white N-process after stripping was resolved in acidifying; Add lime white, the pH value of regulating terminal water outlet and adds PAC, APAM solution at the end of water outlet between 9～10; From being mixed into the flocculation sediment stage, the throw out of water-bed portion irregularly effluxes through waterpower.
3, the water flows gently for the flocculation sediment process, and hydraulic detention time is 4～4.5 hours, and suspended substance is removed Zn in the water 70～90% in the removal water
2+95～99%, the current bottom has a large amount of throw outs to generate simultaneously, irregularly effluxes.
4, to get into the CASS pond biochemical for the terminal supernatant water outlet of flocculation sediment, began to intake 2～3 hours, begins through the variable micropore aerator aeration of the tubular type of water-bed portion the 2nd hour of water inlet accumulative total; Continuous aeration stopped in 6～7 hours; Beginning quiescent setting 0.5～1 hour is strained hydrophone and was begun to strain water 2～2.5 hours, effluxes with rising pipe; Be idle 0.5～1 hour stage subsequently, wait for the beginning in biochemical cycle of next CASS method.
Embodiment
Through the practical implementation instance the present invention is done further explain below, but be not restriction protection domain of the present invention.
Embodiment 1
Acid waste water and alkaline waste water are mainly discharged in viscose glue production technique workshop, and the acid waste water volume is 2 times of alkaline waste water under the ordinary production processing condition.Acid waste water mainly contains H
2SO
4, ZnSO
4And Na
2SO
4, use the observed value of following acid waste water: the pH value is 1.2, COD
Cr390mg/L, Zn
2+70mg/L, suspended substance 480mg/L.Alkaline waste water mainly contains NaOH, Na
2S, CS
2With Mierocrystalline cellulose yellow acid fat, use the observed value of following alkaline waste water: pH value 12, COD
Cr2350mg/L, suspended substance 150mg/L.After the acid waste water alkaline waste water mixed in 2: 1 by volume, adopt following observed value: pH value 2.6, COD
Cr1050mg/L, Zn
2+50mg/L, suspended substance 410mg/L.Control handling the back effluent index according to first discharge standard corresponding among the GB8978-96: pH value 6～9, COD
Cr＜100mg/L, Zn
2+＜2mg/L, suspended substance＜70mg/L, colourity＜60 times.
Embodiment 2
When pH value 2.7, the hydraulic retention acidification through 1.5 hours, the cellulose sulfonate in the waste water can be decomposed into other organism of gaseous matter and the easy degraded of CASS method voluntarily, and under the sour environment condition, through the continuous aeration stripping, the CS in the waste water
2, H
2S can separate out the water surface in a large number, plays and both subdues COD in the water
Cr, colourity the time, again acid waste water, alkaline waste water have been carried out thorough mixing.Add lime white and carry out the lime white neutralization, through 0.5 hour hydraulic retention, water outlet latter end pH value was 9.5, reaches Zn
2+Form Zn (OH)
2The theoretical condition of deposition (mainly).Through in lime white, adding 10% flocculant solution 800L/h, 0.5% coagulant aids solution 200L/h with terminal water outlet; Certainly mix through waterpower; The suspended substance that quickens in the waste water forms the flocs unit deposition; Behind 4 hours hydraulic retention of flocculation sediment process, established flocs unit deposition is complete, water outlet latter end supernatant pH value 8.3, COD
CrBe 430mg/L, Zn
2+Removed fully.The terminal supernatant water outlet of flocculation sediment gets into the biochemical cycle of CASS pond; Through water inlet 3 hours, aeration 7 hours (having intersects in 1 hour), deposition 0.5 hour with flooding time, strain water 2 hours, leave standstill 0.5 hour after the processing in totally 12 hours, strain pH value that water effluxes and be 6.9, COD
Cr87mg/L, Zn
2+Do not detect, 50 times of suspended substance 45mg/L, colourity.
Embodiment 3
When pH value 2.1, the hydraulic retention acidification through 2 hours, the cellulose sulfonate in the waste water can be decomposed into other organism of gaseous matter and the easy degraded of CASS method voluntarily, and under the sour environment condition, through the continuous aeration stripping, the CS in the waste water
2, H
2S can separate out the water surface in a large number, plays and both subdues COD in the water
Cr, colourity the time, again acid waste water, alkaline waste water have been carried out thorough mixing.Add lime white and carry out the lime white neutralization, through 1 hour hydraulic retention, water outlet latter end pH value was 9.8, reaches Zn
2+Form Zn (OH)
2The theoretical condition of deposition (mainly).Through in lime white, adding 12.5% flocculant solution 600L/h, 1% coagulant aids solution 150L/h with terminal water outlet; Certainly mix through waterpower; The suspended substance that quickens in the waste water forms the flocs unit deposition; Behind 4.5 hours hydraulic retention of flocculation sediment process, established flocs unit deposition is complete, water outlet latter end supernatant pH value 8.7, COD
CrBe 490mg/L, Zn
2+Removed fully.The terminal supernatant water outlet of flocculation sediment gets into the biochemical cycle of CASS pond, through water inlet 2 hours, aeration 6.5 hours, deposition 0.5 hour, strain water 2.5 hours, leave standstill 0.5 hour after the processing in totally 12 hours, strain pH value that water effluxes and be 7.1, COD
CrBe 76mg/L, Zn
2+Do not detect, 45 times of suspended substance 38mg/L, colourity.
Claims (7)
1. physico-chemical process adds CASS method biochemical treatment viscose fiber waster water process; It is characterized in that described physico-chemical process adds CASS method biochemical treatment viscose fiber waster water process and resolves stripping, lime white neutralization, flocculation sediment and CASS method biochemistry by acidifying and realize, pH value was 2 ~ 3 when stripping was resolved in described waste water acidifying, the pH value was 9 ~ 10 when lime white concentration was 10 ~ 15% (weightmeasurement ratios), flocculation sediment, the CASS method biochemistry cycle is 10 ~ 12 hours.
2. physico-chemical process according to claim 1 adds CASS method biochemical treatment viscose fiber waster water process, it is characterized in that described acidifying to resolve the stripping hydraulic detention time be in 1.5 ~ 2 hours, lime white and hydraulic detention time is that 0.5 ~ 1 hour, flocculation sediment hydraulic detention time are 4 ~ 4.5 hours.
3. physico-chemical process according to claim 1 adds CASS method biochemical treatment viscose fiber waster water process, it is characterized in that the used flocculant solution of described flocculation sediment is that 10 ~ 12.5 % (with water weight ratio), coagulant aids solution are 0.5 ~ 1 % (with water weight ratio).
4. add CASS method biochemical treatment viscose fiber waster water process according to claim 1 or 4 described physico-chemical process, it is characterized in that described flocculation agent name is called PAC (flocculant of polymeric aluminium chloride), the coagulant aids name is called APAM (anion-polyacrylamide).
5. physico-chemical process as claimed in claim 1 adds CASS method biochemical treatment viscose fiber waster water process, it is characterized in that physico-chemical process+CASS method biochemistry comprises following sequential steps:
(1) viscose fiber waste water mixes with alkaline waste water volume ratio 2:1 by acid waste water, stirs through perforated pipe aerating regulation, makes composite waste pH value between 2 ~ 3;
(2) the back water outlet is resolved in acidifying, in it, adds the lime white of 10 ~ 15% (weightmeasurement ratios), regulates the interior pH value of water between 9 ~ 10;
(3) add flocculation agent and coagulant aids, 600 ~ 800 liters/hour of 10 ~ 12.5 % flocculant solution dosages, 150 ~ 200 liters/hour of 0.5 ~ 1 % coagulant aids solution dosages;
(4) the flocculation sediment stage is carried out in the water outlet that adds behind flocculation agent, the coagulant aids;
(5) the supernatant water outlet begins CASS pond biological process behind the flocculation sediment;
(6) processing in biochemical 10 ~ 12 hours through the CASS pond, the supernatant water-decanting and discharging.
6. physico-chemical process according to claim 1 adds CASS method biochemical treatment viscose fiber waster water process, the order that it is characterized in that the biochemical cycle of described CASS method for water inlet 2 ~ 3 hours, 6 ~ 7 hours (can intersect if having time) of aeration, deposition 0.5 ~ 1 hour with water inlet, strain water 2 ~ 2.5 hours, left standstill 0.5 ~ 1 hour.
7. physico-chemical process according to claim 6 adds CASS method biochemical treatment viscose fiber waster water process, it is characterized in that described aeration, employing be to put the variable micro-hole aerator of tubular type at CASS biochemistry pool base fabric.
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Cited By (8)
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|---|---|---|---|---|
| CN104086011A (en) * | 2014-07-07 | 2014-10-08 | 成都丽雅纤维股份有限公司 | Zero discharge process suitable for waste water of viscose fiber industrial acid station |
| CN104445447A (en) * | 2014-10-20 | 2015-03-25 | 宜宾丝丽雅股份有限公司 | Treatment device for acid sewage generated in viscose staple fibre treatment |
| 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 |
| CN107777802A (en) * | 2016-08-25 | 2018-03-09 | 上海江柘环境工程技术有限公司 | A kind of acid waste water processing system and its handling process method |
| 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 |
| CN111825234A (en) * | 2019-04-16 | 2020-10-27 | 山东雅美科技有限公司 | Viscose fiber production wastewater pretreatment neutralization process method |
| CN114195290A (en) * | 2021-12-13 | 2022-03-18 | 唐山三友集团兴达化纤有限公司 | Method for retarding scaling in viscose fiber wastewater treatment process by using purified sodium hydrosulfide byproduct |
| CN115093000A (en) * | 2022-05-24 | 2022-09-23 | 金光纤维(江苏)有限公司 | Viscose fiber wastewater quality-based treatment method |
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2011
- 2011-12-21 CN CN2011104337222A patent/CN102603112A/en active Pending
Non-Patent Citations (1)
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|---|
| 罗院生: "物化-生化法两级处理粘胶纤维厂酸碱废水工艺设计", 《给水排水》 * |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104086011A (en) * | 2014-07-07 | 2014-10-08 | 成都丽雅纤维股份有限公司 | Zero discharge process suitable for waste water of viscose fiber industrial acid station |
| CN104086011B (en) * | 2014-07-07 | 2016-02-10 | 成都丽雅纤维股份有限公司 | Be applicable to the technique of zero discharge of viscose fibre industry acid station waste water |
| CN104445447A (en) * | 2014-10-20 | 2015-03-25 | 宜宾丝丽雅股份有限公司 | Treatment device for acid sewage generated in viscose staple fibre treatment |
| CN104445447B (en) * | 2014-10-20 | 2016-08-24 | 宜宾丝丽雅股份有限公司 | A kind of short rayon fiber sour water processing means |
| 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 |
| CN105347571B (en) * | 2015-12-03 | 2018-03-09 | 唐山三友集团兴达化纤有限公司 | Utilize the method for salkali waste Slag treatment wastewater from viscose fiber producing |
| CN107777802A (en) * | 2016-08-25 | 2018-03-09 | 上海江柘环境工程技术有限公司 | A kind of acid waste water processing system and its handling process method |
| CN107777802B (en) * | 2016-08-25 | 2022-06-17 | 上海江柘环境工程技术有限公司 | Acidic wastewater treatment system and treatment process method thereof |
| 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 |
| CN111825234A (en) * | 2019-04-16 | 2020-10-27 | 山东雅美科技有限公司 | Viscose fiber production wastewater pretreatment neutralization process method |
| CN114195290A (en) * | 2021-12-13 | 2022-03-18 | 唐山三友集团兴达化纤有限公司 | Method for retarding scaling in viscose fiber wastewater treatment process by using purified sodium hydrosulfide byproduct |
| CN115093000A (en) * | 2022-05-24 | 2022-09-23 | 金光纤维(江苏)有限公司 | Viscose fiber wastewater quality-based treatment method |
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Application publication date: 20120725 |