CN101648765B - Method for zero discharge of wastewater in agar carrageenan production - Google Patents
Method for zero discharge of wastewater in agar carrageenan production Download PDFInfo
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- CN101648765B CN101648765B CN200910039903XA CN200910039903A CN101648765B CN 101648765 B CN101648765 B CN 101648765B CN 200910039903X A CN200910039903X A CN 200910039903XA CN 200910039903 A CN200910039903 A CN 200910039903A CN 101648765 B CN101648765 B CN 101648765B
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/10—Biological treatment of water, waste water, or sewage
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Abstract
The invention discloses a method for zero discharge of wastewater in the agar carrageenan production, aiming at the technology process of the agar carrageenan production and water utilization features of each process, in the method, the discharge water containing less acid and alkali or impurities is recovered, and after being filtered and sedimented, the recovered discharge water are used again in the production. the wastewater containing higher acid and alkali or more impurities is subjected to recovery treatment; the pH value of the wastewater is adjusted by using muriatic acid after the wastewater is subjected to rough filtration; biological treatment and flocculation treatment are carried out on the wastewater by utilizing aerobic biological activated sludge; and then the wastewater passes through a two-stage sand filter and flows back to a recovered pool; the pH value of the wastewater is adjusted by the sodium hypochlorite, the treated wastewater can be used in the following links, such as raw material washing, alkali treatment, washing after alkali treatment of the seaweed raw material, washing of the production field and the like, so that the purpose of zero discharge is achieved.
Description
Technical field
The invention belongs to the processing method of the application of sewage disposal technology in the chemical field, particularly zero discharge of wastewater in agar carrageenan production.
Background technology
When using marine alga raw materials such as fragrant plant mentioned in ancient texts, husky dish, Eucheuma muricatum (Gmel.) Web to carry out processing agar-agar, carrageenin, chemical materialss such as sodium hydroxide, hydrochloric acid, clorox, oxalic acid in alkaline purification and bleaching process, have been used, the waste water that produces contains more salt, ammonia nitrogen, alkali and other organism, many producers directly discharge or only are just dischargings after the simple process, cause tangible pollution to destroy to environment.Because wastewater in agar carrageenan production can not get effective processing, begin the nineties in last century, comprise that many countries and regions of China have limited the production of agar carrageenan, developed country is from producing country's buying primary processed items basically and then carries out precision work, thereby avoided the various environmental pollutions of leaching process.Therefore, survival and development for agar carrageenan manufacturing enterprise, remove directly with the pH in the cleaning process after the alkaline purification less than 7.5 water and bleaching back clean, in the immersion process pH greater than 5.5 water, and the snowmelt in the lyophilization process is recovered to the recovery pond, precipitation after filtration,, recirculation is used, outside the water saving, seek produce in a kind of low cost, the practical processing method process for producing contain acid, the more waste water of alkali, the emission pollution problem that solves wastewater in agar carrageenan production is just very necessary and urgent.
Summary of the invention
The processing method that the purpose of this invention is to provide a kind of zero discharge of wastewater in agar carrageenan production, water characteristics at the agar carrageenan technological process of production and each operation, to contain acid, alkali is less or impure less discharge water reclaims, after filtration, post precipitation uses once more to produce and; And to contain acid, alkali is higher or impure more waste water, after the filtration, regulating pH with hydrochloric acid is 6.0-7.0, utilize aerobic biological activity mud that waste water is carried out a biological disposal upon then, 6-10 hour flocculation treatment is carried out in the biological treatment back at flocculation basin, then flowing to pond for recovering by the two-stage sand filter reclaims, in pond for recovering, add the chlorine bleach liquor to pH be 7.0-8.0, cleaning after raw material cleaning, alkaline purification and the alkaline purification of marine alga raw material that is used for once more producing and this several links of cleaning of production site reach the purpose of zero release.
The present invention includes following steps:
(1) contain acid, the less discharge water of alkali is directly recycled
Water and the water of bleaching pH 〉=5.5 in back cleaning, the immersion process with the pH in the cleaning process after the alkaline purification≤7.5, and concentrated after filtration being recovered to of the snowmelt in the lyophilization process reclaimed the pond, cross precipitation at the pond for recovering back warp, extracting at the middle and upper levels, water is used for producing;
(2) contain acid, the more waste water reclamation mixing of alkali
The water of the pH in the cleaning process after the alkaline purification＞7.5 is concentrated on wastewater disposal basin with the water of bleaching pH＜5.5 in the cleaning process of back, mix;
(3) regulate the pH value
Mixed waste water enters the pH regulator pond through 80 mesh filter screen coarse filtration, and regulating pH with hydrochloric acid is 6.0-7.0;
(4) biological treatment
The waste water of adjusted pH is entered aerobe active sludge treatment pond, in the pond, continue the supply air with air pump and carry out the active sludge biological processing.
(5) flocculation treatment
Waste water after the biological treatment enters flocculation basin, adds flocculation agent and stirs placement 6-10 hour;
(6) reclaim
Waste water after the flocculation treatment flows to pond for recovering after by the two-stage sand filter, and adding clorox, to transfer pH be 7.0-8.0, utilizes once more.
Wastewater treatment efficiency of the present invention reaches zero release, to protection environment and conserve water resource, for the existence of agar carrageenan manufacturing enterprise provides safeguard and promotes its development to have bigger realistic meaning, should promote the use of.
Description of drawings
The concrete implementing procedure figure of Fig. 1 wastewater treatment of the present invention.
Embodiment
The Waste Water Centralized that agar carrageenan production is produced mixes in wastewater disposal basin, enters the pH regulator pond after filtering through 80 mesh filter screens, and the pH value of regulating waste water with hydrochloric acid is 6.0-7.0.The waste water of adjusted pH enters aerobe active sludge treatment pond,, carries out a biological disposal upon to continuing the supply air in the pond about 4 hours with air pump.Waste water after the biological treatment enters flocculation basin, adds flocculation agent and stirs placement 6-10 hour.Flowing to pond for recovering adding clorox accent pH after the waste water after the flocculation treatment filters by the two-stage sand filter is 7.0-8.0.The cleaning after raw material cleaning, alkaline purification and the alkaline purification that water after the processing is used for producing and the cleaning of production site reach the purpose of zero release.
Though waste water contains a certain amount of sodium-chlor after treatment, experimental results show that the production and the quality product that do not influence agar-agar and carrageenin, on producing, can recycle.
Embodiment 1
About 150 tons of the waste water of pilot plant discharging every day that day processing marine alga raw material is 2 tons is divided into 3 batches after mixing and handles, to alleviate the construction input of Waste Water Treatment in wastewater disposal basin.At pH regulator Chi Rushuikouchu 80 mesh filter screens are set, waste water enters the pH regulator pond behind the net filtration after filtration, the pH of waste water＞12, and the pH value of regulating waste water with hydrochloric acid is 6.0.Waste water behind the adjusting pH enters aerobe active sludge treatment pond, to contain the aerobic activated sludge that carries out the salinity domestication microorganism hangs in biological treatment tank by the interval of each 40cm all around, in the pond, continue supply air 4 hours with air pump, carry out a biological disposal upon.Waste water after the biological treatment enters flocculation basin, and the polyacrylamide solution of adding 0.15% also stirs, and places 6 hours.Use the pebbles material of 8-12mm particle diameter 100mm thickness as the support bottom around the first step sand filter water outlet filter, the quartz sand of particle diameter as 1mm thickness 800mm used in the middle layer, the upper strata uses the quartz sand of 1.5-2.0mm thickness 400mm to make filtering layer, and second stage sand filter uses particle diameter to make filtering layer as the quartz sand of 1mm thickness 1300mm.Flow to pond for recovering after the waste water after the flocculation treatment filters by the two-stage sand filter, it is 7.5 that the adding chlorine bleach liquor transfers pH.The cleaning after raw material cleaning, alkaline purification and the alkaline purification that water after the processing is used for producing and the cleaning of production site reach the purpose of zero release.Effect after the wastewater treatment sees the following form
mg/L
| Pollutent | Waste water (mg/L) before handling | Processed waste water (mg/L) |
| pH | 12 | 7.5 |
| Colourity (extension rate) | 256 | 32 |
| Biochemical oxygen demand (BOD) BOD on the 5th 5 | 97 | 8.3 |
| Suspended substance | 4368.3 | 29.6 |
| Chemical oxygen demand COD | 139 | 22 |
| Ammonia nitrogen | 54.7 | 6.9 |
| Muriate | 337 | 351 |
| Sodium | 275.1 | 293.5 |
| Plumbous (in Pb) | ＜0.01 | ＜0.01 |
| Arsenic (in As) | ＜0.01 | ＜0.01 |
| Cadmium (in Cd) | ＜0.005 | ＜0.005 |
| Mercury (in Hg) | ＜0.001 | ＜0.001 |
Claims (1)
1. the method for a zero discharge of wastewater in agar carrageenan production is characterized in that comprising the steps:
One, contain acid, alkali is less or impure less discharge water is directly recycled
Water and the water of bleaching pH 〉=5.5 in back cleaning, the immersion process with the pH in the cleaning process after the alkaline purification≤7.5, and snowmelt in the lyophilization process and impure less discharge water, concentrate after filtration to be recovered to and reclaim the pond, cross precipitation at the pond for recovering back warp, extracting at the middle and upper levels, water is used for producing;
Two, contain acid, alkali is more or impure more waste water reclamation utilization
(1) concentrated, composite waste
The discharge water and the impure higher discharge water of pH＜5.5 that produce in the discharge water of pH＞7.5 that produce in the cleaning process after the alkaline purification operation, the bleaching process cleaning process are concentrated on wastewater disposal basin, mix;
(2) regulate the pH value
Mixed waste water enters the pH regulator pond after 80 mesh filter screens filter, regulating pH with hydrochloric acid is 6.0-7.0;
(3) biological activity sludge treatment
Add the aerobe active sludge in the active sludge treatment pond, the waste water of adjusted pH value is entered the active sludge treatment pond, in the pond, continue to supply air 3-4 hour, carry out a biological disposal upon with air pump;
(4) flocculation treatment
Waste water after biological treatment enters flocculation basin, adds flocculation agent and stirs placement 6-10 hour;
(5) reclaim
Waste water after the flocculation treatment flows to pond for recovering after filtering by the two-stage sand filter, and adding clorox accent pH is 7.0-8.0, utilizes once more.
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| Application Number | Priority Date | Filing Date | Title |
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| CN200910039903XA CN101648765B (en) | 2009-05-27 | 2009-05-27 | Method for zero discharge of wastewater in agar carrageenan production |
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| CN200910039903XA CN101648765B (en) | 2009-05-27 | 2009-05-27 | Method for zero discharge of wastewater in agar carrageenan production |
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| CN101648765A CN101648765A (en) | 2010-02-17 |
| CN101648765B true CN101648765B (en) | 2011-07-20 |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104445707A (en) * | 2014-10-21 | 2015-03-25 | 上海应用技术学院 | Method for removing COD and chromaticity from carrageenan press water |
| CN105271576B (en) * | 2015-11-10 | 2017-11-14 | 中国科学院海洋研究所 | A kind of method of wastewater treatment in agar-agar production |
| CN107400181B (en) * | 2017-09-04 | 2022-11-22 | 广东海洋大学 | Alkali treatment device for agar production and use method thereof |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007196137A (en) * | 2006-01-26 | 2007-08-09 | Kurita Water Ind Ltd | Treatment method and apparatus for biologically treated water |
| CN101143905A (en) * | 2006-09-15 | 2008-03-19 | 中国科学院大连化学物理研究所 | Green extraction method for gelose |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007196137A (en) * | 2006-01-26 | 2007-08-09 | Kurita Water Ind Ltd | Treatment method and apparatus for biologically treated water |
| CN101143905A (en) * | 2006-09-15 | 2008-03-19 | 中国科学院大连化学物理研究所 | Green extraction method for gelose |
Non-Patent Citations (1)
| Title |
|---|
| 黄文生等.水解酸化――接触氧化工艺处理琼脂生产废水.《环境》.2006,(第10期), * |
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