CN105461106A - Optimization of wastewater fluorine-removal method and process through sludge refluxing effect - Google Patents
Optimization of wastewater fluorine-removal method and process through sludge refluxing effect Download PDFInfo
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- CN105461106A CN105461106A CN201510829149.5A CN201510829149A CN105461106A CN 105461106 A CN105461106 A CN 105461106A CN 201510829149 A CN201510829149 A CN 201510829149A CN 105461106 A CN105461106 A CN 105461106A
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- lime
- sludge
- fluorine
- waste water
- flocculation
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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
- C02F9/00—Multistage treatment of water, waste water or sewage
-
- 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
-
- 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
-
- 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
- C02F1/58—Treatment of water, waste water, or sewage by removing specified dissolved compounds
- C02F1/583—Treatment of water, waste water, or sewage by removing specified dissolved compounds by removing fluoride or fluorine compounds
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/12—Halogens or halogen-containing compounds
- C02F2101/14—Fluorine or fluorine-containing compounds
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2301/00—General aspects of water treatment
- C02F2301/08—Multistage treatments, e.g. repetition of the same process step under different conditions
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- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Separation Of Suspended Particles By Flocculating Agents (AREA)
- Removal Of Specific Substances (AREA)
Abstract
The invention discloses optimization of a wastewater fluorine-removal method and process through a sludge refluxing effect; fluorine-containing substances in water can be effectively removed; through combination of a lime fluorine-removal method and an efficient sedimentation tank process, process parameters are optimized; sludge in a sedimentation zone of an efficient sedimentation tank is refluxed to a flocculation zone according to a certain proportion, so that the concentration of the sludge in the flocculation zone is increased; a carrier is provided for calcium fluoride, fluorine removal is strengthened, the disadvantages of large lime addition amount and low treatment efficiency in a conventional general treatment process are improved, and lime is efficiently used. The method and process have the characteristics of good water quality of effluent, less drug consumption, high sludge solid containing rate, and small occupied land area.
Description
Technical field
The present invention relates to and a kind ofly optimize the method for FLUORIDE REMOVAL IN WASTEWATER and technique by sludge reflux effect, object to improve the shortcoming of current lime except fluorine to existing defluorinating process.
Background technology
Fluoride waste produces very bad impact to HUMAN HEALTH and ecotope.Therefore, domestic and international in recent years have a lot of research to defluorinating process.The main technology of Fluoride Removal formed both at home and abroad at present mainly comprises absorption method, electroosmose process, reverse osmosis method, ion exchange method, chemical precipitation method etc.Wherein, in chemical precipitation method, the method for feeding lime is lower, the widely used defluorination method of a kind of cost, the part but the method comes with some shortcomings, such as due to the feature of lime itself, cause lime utilization ratio low, chemical feeding quantity is large, and water outlet fluorion is difficult to be removed to lower level; Require high sewage to water outlet, the method is difficult to realize.
The present invention is by being combined lime defluorination method with High-rate sedimentation pool process, lime is realized except fluorine by the efficient sedimentation tank with sludge reflux effect, lime is reused, improve flocculation zone sludge concentration, and provide carrier for Calcium Fluoride (Fluorspan), strengthen the removal to fluorine, improve in the past in conventional treatment process Lime-Injecting amount large, the drawback that processing efficiency is low, realizes the efficiency utilization of lime.Have effluent quality good, medicine consumption is few, and mud solid content is high, the feature that floor space is little.
Summary of the invention
Main purpose of the present invention is to disclose a kind of method and the technique of being optimized FLUORIDE REMOVAL IN WASTEWATER by sludge reflux effect, in the method and technique, by to feeding lime in waste water, regulate wastewater pH to be 8 ~ 9 with sulfuric acid, and the method for dosing coagulant and flocculation agent reach the object except fluorine.Focus on, the mud of settling region is back to flocculation zone by a certain percentage, increase sludge concentration, returned sluge is fully combined with lime and sewage, improves lime utilization ratio, reduces Lime-Injecting amount, for precipitation provides carrier.
That the present invention uses a kind of feeding lime and the mud of settling region is back to by a certain percentage the method for the High-rate sedimentation of flocculation zone and technique and removes fluorine-containing material in waste water, its concrete technological step is as follows:
(1) in waste water, lime is added by automatic dosing apparatus, for removing the fluorion in waste water;
(2) in described waste water, add sulfuric acid, thus the pH value regulating reaction is 8 ~ 9;
(3) in described waste water, add coagulating agent, produce the complex compound sediment of insoluble;
(4) in described waste water, add flocculation agent, make precipitation flocculation thus rapid precipitation;
(5) efficient sedimentation tank by having sludge reflux effect realizes above step.
In described method and technique, in waste water after feeding lime, churning time is 15min,
In described method and technique, in waste water after coagulating agent, abundant churning time is 2 ~ 3min;
In described method and technique, in waste water, add flocculation agent, after low rate mixing 15min, quiescent setting 20min;
In described method and technique, efficient sedimentation tank establishes mud return line at the bottom of pond, and by a part of sludge reflux to flocculation zone, recurrence rate is 4 ~ 8%.
A kind of method and technique being optimized FLUORIDE REMOVAL IN WASTEWATER by sludge reflux effect of the present invention, processes below the content 15mg/L of fluorine in the sewage obtained.Mainly there is the effect of following two aspects in the inventive method and technique: lime defluorination method combines with High-rate sedimentation pool process by (1), and processing parameter is optimized compared with existing method and technique; (2) efficient sedimentation tank establishes mud return line, realizes sludge reflux, increases sludge concentration, improves lime utilization ratio, reduces Lime-Injecting amount, cost-saving, and provides carrier for precipitating, and accelerates the precipitation of fluorine.
Accompanying drawing explanation
Fig. 1 efficient sedimentation tank orthographic plan of the present invention
Embodiment
A. Lime-Injecting district in figure, B. acid adding district, C. coagulation district, D. flocculation zone, E. precipitation-enrichment region
1. water inlet pipe, 2. Lime-Injecting pipe, 3. lime stirrer, 4. sulfuric acid adds pipe, 5. acid adding district agitator, 6. coagulant dosage pipe, 7. coagulation agitator, 8. flocculant concentration pipe, 9. flocculation stirring device, 10. tube settling district, 11. bottom pipe, 12. sludge return pipes, 13. sludge hoppers, 14. water legs, 15. concentrated mud scrapers, 16. rising pipes, 17. guide shells, 18. plug-flow walls.
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described.
Device shown in Fig. 1, this fluorine-containing wastewater treatment method and technique device used are efficient sedimentation tank, and be divided into five parts: Lime-Injecting district A, acid adding district B, coagulation district C, flocculation zone D, precipitation-enrichment region E, be interconnected between five parts.First fluoride waste enters Lime-Injecting district A by water inlet pipe 1, and add by Lime-Injecting pipe 2 lime solution that concentration is 5 ~ 10% at Lime-Injecting district A automatic medicine adding apparatus, dosage regulates automatically according to flooding quantity, the Ca in waste water
2+ion and F
-ion generates CaF
2, add pipe 4 by sulfuric acid after stirring and add sulphur acid for adjusting pH to 8 ~ 9, added the coagulant polymeric aluminium chloride of 10% by coagulant dosage pipe 6, after coagulation agitator 7 fully stirs 2min, the Ca in water
2+, F
-the complex compound of indissoluble is formed further with Al.Sewage enters bottom the D of flocculation zone by coagulation district C bottom conduit 11, bottom pipe 11 is communicated with the guide shell 17 of flocculation zone D further, thus sewage enters the guide shell 17 of flocculation zone D, flocculant solution is added by flocculant concentration pipe 8, after flocculation stirring device 9 low rate mixing 15min, enter precipitation-sludge condensation district E by a plug-flow wall 18, staticly settle 20min.Precipitation-sludge condensation district E is provided with concentrated mud scraper 15, sludge return pipe 12, by sludge return pipe 12 reflux 4 ~ 8% mud to the bottom of flocculation zone D, by concentrated mud scraper 15 by the sludge scraping that is deposited at the bottom of pond in sludge hopper 13, clear water is after treatment discharged by rising pipe 16 after water leg 14 is collected.
In described equipment, coagulation district C establishes bottom pipe 11, and the sewage of coagulation district C enters bottom the D of flocculation zone by bottom conduit 11, and bottom pipe 11 is communicated with the guide shell 17 of flocculation zone further; Precipitation-concentrate and go to establish sludge return pipe 12 at the bottom of E pond, communicates with flocculation zone D, by a part of sludge reflux to flocculation zone D.
Below in conjunction with embodiment, the present invention is made further detailed description.
The device of mimic diagram 1, makes a small testing device similar to the structure function of device in Fig. 1, simulates the efficient sedimentation tank described in this patent.
Embodiment 1
Except waste water quality before fluorine process is as following table (mg/L):
Get 500mL Coal Chemical Industry fluoride waste first to be entered in Lime-Injecting district A by the water inlet pipe 1 of small testing device, and add to Lime-Injecting district A the lime solution that 4mL concentration is 10%, stir 15min with mechanical stirrer, survey its pH value and be about 11; Enter after acid adding district B until waste water, add sulphuric acid soln and regulate pH to 8 ~ 9, the dosage of sulfuric acid is 1.5mL; Enter after coagulation district C until waste water, add the polymerize aluminum chloride coagulating agent 1.5mL that concentration is 10%, abundant stirring 2min, after waste water enters flocculation zone D by bottom pipe 11, add the flocculation agent polyacrylamide solution 0.5mL that concentration is 10%, after low rate mixing 15min, sewage enters simulation precipitation-sludge condensation district E by plug-flow wall 18, staticly settles 20min.The water taking out water pipe 16 discharge surveys its Oil repellent.
This process is continuous treating processes, precipitation-sludge condensation district E is provided with sludge return pipe 12, by sludge return pipe 12 reflux 4 ~ 8% mud to the bottom of flocculation zone D, fetching flow is respectively 0%, 4%, 6%, 8%, 10%, 15%, contrasts the removal effect of fluorine during different quantity of reflux.
From result, during without backflow, in processed waste water, the content of fluorion is 20.5mg/L; When having backflow, in processed waste water, the content of fluorion is all reduced to below 15mg/L, and when reflux ratio is 4% ~ 8%, in processed waste water, the content of fluorion reaches lower level; Continue to increase quantity of reflux, in processed waste water, the content of fluorion is not obvious.
As can be seen here, when sludge reflux rate is 6%, best to the treatment effect of fluorine, poor without reflowing result, quantity of reflux increases clearance impact little, causes processing cost to improve.
Embodiment 2
Divide 4 groups of experiments.Ensure that in embodiment 1, other conditions are constant, sludge reflux rate gets 6%, and the amount of getting the lime added in Lime-Injecting district A is respectively 2mL, 4mL, 6mL, 8mL, namely adds concentration and is respectively 400mg/L, 800mg/L, 1200mg/L, 1600mg/L.After process terminates, the water taking out water pipe 16 discharge surveys its Oil repellent.Through after fluorine process, the fluorinion concentration after process in water sees the following form:
From result, during Lime-Injecting concentration 400mg/L to 1600mg/L, in processed waste water, the content of fluorion is at below 15mg/L, and when wherein Lime-Injecting concentration is 800mg/L, in processed waste water, the concentration of fluorion is minimum.After this, along with the increase of Lime-Injecting concentration, the removal efficiency change of fluorine is little.
In addition, through verification experimental verification, when without sludge reflux, when Lime-Injecting concentration is 2000mg/L, fluorine in wastewater content can only be dropped to about 12mg/L, therefore, during without sludge reflux, want to reach and defluorination effect similar when having a backflow, Lime-Injecting amount is larger.
From above-mentioned, Lime-Injecting concentration gets 800mg/L, and the consumption of lime is lower, strengthens Lime-Injecting concentration on the removal efficiency impact of fluorine not quite, causes processing cost to improve.And compare with without disposition during sludge reflux, greatly reduce the dosage of lime, improve fluorine removing rate.
Claims (3)
1. optimized method and the technique of FLUORIDE REMOVAL IN WASTEWATER by sludge reflux effect, effectively can remove the fluorine-containing material in water, it is characterized in that:
(1) in waste water, lime is added by automatic dosing apparatus, for removing the fluorion in waste water;
(2) in described waste water, add sulfuric acid, thus the pH value regulating reaction is 8 ~ 9;
(3) in described waste water, add coagulating agent, produce the complex compound sediment of insoluble;
(4) in described waste water, add flocculation agent, make precipitation flocculation thus rapid precipitation;
(5) efficient sedimentation tank by having sludge reflux effect realizes above step.
2. method according to claim 1 and technique, is characterized in that, coagulating agent aluminium salt.
3. method according to claim 1 and technique, is characterized in that, efficient sedimentation tank establishes sludge return pipe at the bottom of pond, and by a part of sludge reflux to flocculation zone, recurrence rate is 4 ~ 8%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510829149.5A CN105461106A (en) | 2015-11-25 | 2015-11-25 | Optimization of wastewater fluorine-removal method and process through sludge refluxing effect |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510829149.5A CN105461106A (en) | 2015-11-25 | 2015-11-25 | Optimization of wastewater fluorine-removal method and process through sludge refluxing effect |
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| Publication Number | Publication Date |
|---|---|
| CN105461106A true CN105461106A (en) | 2016-04-06 |
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| CN201510829149.5A Pending CN105461106A (en) | 2015-11-25 | 2015-11-25 | Optimization of wastewater fluorine-removal method and process through sludge refluxing effect |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106830554A (en) * | 2017-03-15 | 2017-06-13 | 无锡德宝水务投资有限公司 | A kind of processing method of photovoltaic industry waste water |
| CN108059223A (en) * | 2017-12-22 | 2018-05-22 | 北京翰祺环境技术有限公司 | A kind of method that negative hardness waste water removes silicon |
| CN108408988A (en) * | 2018-05-17 | 2018-08-17 | 北京翰祺环境技术有限公司 | A kind of method and apparatus of substep removal fluorine in wastewater compound |
| CN109626642A (en) * | 2018-12-27 | 2019-04-16 | 北京翰祺环境技术有限公司 | Fluorine-contained wastewater treatment system and fluorine-containing wastewater treatment method |
| CN111620457A (en) * | 2019-02-28 | 2020-09-04 | 东台市远洋不锈钢制造有限公司 | Method for treating wastewater containing fluorine acid based on pipeline production |
| CN113429062A (en) * | 2021-05-20 | 2021-09-24 | 光大水务(德州)有限公司 | Efficient defluorination process for low-fluorine wastewater |
| CN114426348A (en) * | 2020-09-02 | 2022-05-03 | 中国石油化工股份有限公司 | High-salinity wastewater treatment system and treatment method |
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| CN103102027A (en) * | 2013-02-26 | 2013-05-15 | 宏大中源太阳能股份有限公司 | Sewage treatment system and method for solar cell production |
| CN104961304A (en) * | 2015-07-15 | 2015-10-07 | 大连世达特环保科技有限公司 | High-concentration fluorine chemical wastewater treatment technology |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2006055728A (en) * | 2004-08-19 | 2006-03-02 | Matsushita Electric Ind Co Ltd | Method and apparatus for treating fluorine-containing wastewater |
| CN103102027A (en) * | 2013-02-26 | 2013-05-15 | 宏大中源太阳能股份有限公司 | Sewage treatment system and method for solar cell production |
| CN104961304A (en) * | 2015-07-15 | 2015-10-07 | 大连世达特环保科技有限公司 | High-concentration fluorine chemical wastewater treatment technology |
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106830554A (en) * | 2017-03-15 | 2017-06-13 | 无锡德宝水务投资有限公司 | A kind of processing method of photovoltaic industry waste water |
| CN106830554B (en) * | 2017-03-15 | 2020-09-04 | 无锡德宝水务投资有限公司 | Treatment method of photovoltaic industrial wastewater |
| CN111995181A (en) * | 2017-03-15 | 2020-11-27 | 无锡德宝水务投资有限公司 | Treatment method of photovoltaic industrial wastewater |
| CN111995181B (en) * | 2017-03-15 | 2022-09-06 | 无锡德宝水务投资有限公司 | Treatment method of photovoltaic industrial wastewater |
| CN108059223A (en) * | 2017-12-22 | 2018-05-22 | 北京翰祺环境技术有限公司 | A kind of method that negative hardness waste water removes silicon |
| CN108059223B (en) * | 2017-12-22 | 2020-10-02 | 北京翰祺环境技术有限公司 | Method for removing silicon from negative-hardness wastewater |
| CN108408988A (en) * | 2018-05-17 | 2018-08-17 | 北京翰祺环境技术有限公司 | A kind of method and apparatus of substep removal fluorine in wastewater compound |
| CN109626642A (en) * | 2018-12-27 | 2019-04-16 | 北京翰祺环境技术有限公司 | Fluorine-contained wastewater treatment system and fluorine-containing wastewater treatment method |
| CN111620457A (en) * | 2019-02-28 | 2020-09-04 | 东台市远洋不锈钢制造有限公司 | Method for treating wastewater containing fluorine acid based on pipeline production |
| CN114426348A (en) * | 2020-09-02 | 2022-05-03 | 中国石油化工股份有限公司 | High-salinity wastewater treatment system and treatment method |
| CN113429062A (en) * | 2021-05-20 | 2021-09-24 | 光大水务(德州)有限公司 | Efficient defluorination process for low-fluorine wastewater |
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Application publication date: 20160406 |