CN102417247B - Two-stage sludge reflux enhanced coagulation technology - Google Patents
Two-stage sludge reflux enhanced coagulation technology Download PDFInfo
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- CN102417247B CN102417247B CN 201010293198 CN201010293198A CN102417247B CN 102417247 B CN102417247 B CN 102417247B CN 201010293198 CN201010293198 CN 201010293198 CN 201010293198 A CN201010293198 A CN 201010293198A CN 102417247 B CN102417247 B CN 102417247B
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Abstract
The invention relates to a two-stage sludge reflux enhanced coagulation technology, characterized in that: a two-stage serial coagulation technology is adopted to allow the partial precipitated fresh sludge of stage-2 coagulation to return to stage-1 coagulation with a certain reflux ratio. Compared with the traditional coagulation method, the technology disclosed herein can better utilize the effects of a coagulant in charge neutrality, net capturing, enmeshment, and physical absorption, remove particles with smaller particle sizes, increase the sedimentation rate of floc particles, reduce the addition quantity of the coagulant, increase the coagulation effect, and enhance the operation stability of the system. The technology can be widely applied in water supply and waste water treatment.
Description
Technical field
The invention belongs to the environment protection water-treatment technology field, be specifically related to a kind of two-stage sludge reflux enhanced coagulation technology, can be widely used in pre-treatment or the advanced treatment of feedwater and wastewater treatment.
Background technology
In recent years, China's water environment pollution is on the rise.Water environment pollution has aggravated the imbalance between supply and demand of China's shortage of water resources, has become " bottleneck " problem of restriction Chinese society sustainable economic development.
At present, water technology commonly used mainly contains Coagulation Method, biochemical process, absorption method, embrane method etc.Wherein, Coagulation Method is widely used in various water treatment technological processes as one of important method of water treatment.The quality of its coagulation effect is often determining the operation conditions of follow-up flow process, final outflow water quality and cost, so coagulation technology is research and development field important in engineering of water treatment all the time.
Coagulation Method is dosing coagulant in the water, makes small suspended substance in water and the colloidal polyurea larger particle of integrated heavy speed and the method removed.Coagulation process comprises cohesion and flocculated for two stages: cohesion is that Xiang Shuizhong adds coagulating agent, hydrolysis and polycondensation occur in coagulating agent in water after, by compression double electric layer and the adsorption bridging effect of coagulating agent, and make elimination of colloid stability in water, preliminary cohesion forms little particle; Flocculation is the process that the fine particle of agglomeration process generation is grown up gradually, occurs in flocculation basin.Coagulation Method can reduce the turbidity of former water, and the Oranoleptic indicators such as colourity remove multiple macromolecule organic, some heavy metal thing and radioactive substance.
But there is following problem in traditional coagulation technology: need to add a large amount of chemical agents, therefore increase running cost; Produced a large amount of chemical sludges, made mud subsequent disposal difficulty; Main various suspended particles and the colloidalmaterial of removing in water body, undesirable to removal effects such as the phosphorus in water body, heavy metal and organic pollutants.In this case, in order to improve coagulation technology to various removal of pollutants effects, reduce the chemical agent usage quantity, the reduce mud generation must the efficient enhanced coagulation technology of development.
At present, the returned sluge enhanced coagulation that has large quantity research to use sewage work or coagulation process self to produce is removed the pollutent in water body.This method with the part of the settling tank continuous continuous backflow of sedimentation mud to the flocculation reaction section, thereby reduce the dosage of coagulating agent, reduce simultaneously flco and form the needed time to reduce the volume of reaction tank.But this method has a significant shortcoming: because established flocculation particle in returned sluge can be discharged into pollutent in water body, occur " back mixing phenomenon ", cause the final outflow water water quality deterioration.On the development history of sludge reflux research, how to reduce the release that has been flocculated pollutent in returned sluge, the flocculation performance that improves simultaneously returned sluge is constant theme always.At present, have the investigator to have been found that to add a small amount of coagulating agent to solve the final outflow water water quality deterioration problem that back mixing causes, but for some sewage, as waste water from dyestuff and inoperative.
The present invention has proposed a kind of two-stage type sludge reflux enhanced coagulation technology for addressing the above problem just.By traditional coagulation process being divided into two-stage (firsts and seconds), the fresh sludge of two-stage coagulation is back to the one-level coagulation, two-stage coagulation is taked the mode without the sludge reflux operation, develop a kind of coagulant charging quantity few, can effectively control back mixing and occur, the two-stage sludge reflux enhanced coagulation technology that operating performance is good.This technological operation is easy, and running cost is low, and stable effluent quality produces sludge quantity few, can be widely used in feedwater and wastewater treatment.
Summary of the invention
The object of the present invention is to provide a kind of two-stage type sludge reflux enhanced coagulation technology, to improve coagulation process to the removal of pollutants effect, reduce coagulant charging quantity, reduce the sludge creation amount, and back mixing, the shortcoming of fluctuation of service easily occur when overcoming traditional Coagulation Method sludge reflux.
Main technical content of the present invention is: adopt the two-stage series coagulation process, the part fresh sludge that two-stage coagulation is produced is back to the one-level coagulation with certain proportion.In the one-level coagulation, adopt the operating method operation of low coagulant charging quantity and sludge reflux, remove most pollutent.The fresh sludge that refluxes contains the flco with faint positive charge, and it has abundant hydroxyl activity site, can further bring into play its charge neutrality or adsorption after backflow, removes the suspended particulate in water, thereby can reduce coagulant charging quantity; Simultaneously, the flco that contains in returned sluge can be used as core particle, and the surface-area of necessity is provided for the formation of fresh flocculation agent flco, thereby improves the density of final flco, and the settling velocity of one-level coagulation flco is increased.In two-stage coagulation, adopt higher coagulant charging quantity and move without the operating method of sludge reflux, further remove the pollutent in water, guarantee effluent quality.Two-stage coagulation adopts the operation scheme without sludge reflux, on the one hand can be for the one-level coagulation provide fresh mud, rather than contain " composite sludge " that secondary uses; The fluctuation of service problem that causes when on the other hand, dosing coagulant can solve one-level coagulation generation back mixing.
Two-stage sludge reflux enhanced coagulation technology of the present invention is the two-stage series connection coagulation process.
One-level coagulation of the present invention adopts the operation scheme of sludge reflux, and mud is fresh sludge, and return sludge ratio is 5%-20%.
Two-stage coagulation of the present invention adopts the operation scheme without sludge reflux, and the part fresh sludge of generation is back to the one-level coagulation.
The coagulant charging quantity of one-level coagulation of the present invention is greater than the coagulant charging quantity of two-stage coagulation.
Two-stage sludge reflux reinforcing process of the present invention is compared with traditional coagulation process, charge neutrality, the net that can better bring into play coagulating agent caught, rolled up and sweep and physisorption, can remove the more flocculation particle of small particle size, improve the floc particle settling velocity, has better coagulation effect, and added amount of chemical is few, and system's anti impulsion load ability strengthens, and moves more stable.
Description of drawings
Accompanying drawing 1 is two-stage sludge reflux enhanced coagulation technology schematic diagram of the present invention.
Embodiment
The below's explanation the specific embodiment of the present invention that cites an actual example, but claim scope of the present invention is not limited thereto.
Embodiment 1:
To simulate phosphorous water as example, the phosphorus concentration of the phosphorous water of simulation is 2.0mg/L, pH=7.5.Take aluminum modified red mud as coagulating agent, adopt the two-stage sludge reflux enhanced coagulation technology, return sludge ratio is 15%.When the aluminum modified red mud dosage was 35mg/L (one-level dosage 20mg/L, secondary dosage 15mg/L), the water outlet phosphorus concentration was 0.40mg/L, reaches municipal sewage plant one-level A emission standard.And adopting traditional coagulation process, under identical dosage, the water outlet phosphorus concentration is 0.60mg/L.
Embodiment 2:
To simulate phosphorous water as example, the phosphorus concentration of the phosphorous water of simulation is 2.0mg/L, pH=7.5.Take common polymerize aluminum chloride (PAC) as coagulating agent, adopt the two-stage sludge reflux enhanced coagulation technology, return sludge ratio is 10%.When the PAC dosage was 40mg/L (one-level dosage 25mg/L, secondary dosage 15mg/L), the water outlet phosphorus concentration was 0.40mg/L, reaches municipal sewage plant one-level A emission standard.And adopting traditional coagulation process, under identical dosage, the water outlet phosphorus concentration is 0.70mg/L.
Claims (5)
1. two-stage sludge reflux enhanced coagulation technology, it is characterized in that: adopt the two-stage sludge reflux enhanced coagulation technology, the partly precipitated fresh sludge of two-stage coagulation is back to the one-level coagulation with certain reflux ratio, the one-level coagulation adopts the operating method operation of high coagulating agent and sludge reflux, is used for removing the most pollutent of water; Two-stage coagulation adopts lower coagulating agent and moves without the operating method of sludge reflux, further removes the pollutent in water, strengthens coagulation effect, improves effluent quality; Wherein, the coagulant charging quantity of one-level coagulation is greater than the coagulant charging quantity of two-stage coagulation.
2. two-stage sludge reflux enhanced coagulation technology according to claim 1, it is characterized in that: the two-stage sludge reflux enhanced coagulation technology is two-stage coagulation tandem process.
3. two-stage sludge reflux enhanced coagulation technology according to claim 1, is characterized in that: the partly precipitated fresh sludge of two-stage coagulation is back to the one-level coagulation.
4. two-stage sludge reflux enhanced coagulation technology according to claim 1, it is characterized in that: returned sluge is fresh sedimentation mud.
5. two-stage sludge reflux enhanced coagulation technology according to claim 1, it is characterized in that: return sludge ratio is 5%～20%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN 201010293198 CN102417247B (en) | 2010-09-27 | 2010-09-27 | Two-stage sludge reflux enhanced coagulation technology |
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201010293198 CN102417247B (en) | 2010-09-27 | 2010-09-27 | Two-stage sludge reflux enhanced coagulation technology |
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| CN102417247A CN102417247A (en) | 2012-04-18 |
| CN102417247B true CN102417247B (en) | 2013-06-12 |
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| CN 201010293198 Expired - Fee Related CN102417247B (en) | 2010-09-27 | 2010-09-27 | Two-stage sludge reflux enhanced coagulation technology |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103880206B (en) * | 2012-12-20 | 2015-11-04 | 深圳职业技术学院 | The heavy metal wastewater thereby deep treatment method of the dynamic nucleation flocculation of mud |
| CN107935149B (en) * | 2017-12-29 | 2023-12-26 | 清华大学深圳研究生院 | Sewage and wastewater treatment method and system for coagulation floc backflow |
| CN109133495A (en) * | 2018-07-23 | 2019-01-04 | 华南理工大学 | A kind of carbonless paper coating wastewater treatment and circulation reuse method |
| CN109052809A (en) * | 2018-07-23 | 2018-12-21 | 华南理工大学 | A kind of method of enhanced coagulation processing coating waste water |
| CN114105356B (en) * | 2021-11-18 | 2024-02-06 | 中国轻工业长沙工程有限公司 | Advanced treatment process for waste paper making |
| WO2024076248A1 (en) | 2022-10-07 | 2024-04-11 | First Water Technology Sp. Z O.O. | Low maintenance, gravity powered enhanced coagulation systems |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1412133A (en) * | 2001-10-15 | 2003-04-23 | 中国市政工程华北设计研究院 | Air-stirring sludge-refluxing chemical flocculation precipitation sewage treatment method |
| CN1715217A (en) * | 2004-07-02 | 2006-01-04 | 桂林工学院 | Process for removing nitrogen and phosphor from sewage capable of being built by separate periods |
| CN201154937Y (en) * | 2007-12-07 | 2008-11-26 | 山东省环境保护科学研究设计院 | Advanced treatment device for pulping waste water for paper making |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003001289A (en) * | 2001-06-26 | 2003-01-07 | Ebara Corp | Method and device for biological treatment of organic waste water |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1412133A (en) * | 2001-10-15 | 2003-04-23 | 中国市政工程华北设计研究院 | Air-stirring sludge-refluxing chemical flocculation precipitation sewage treatment method |
| CN1715217A (en) * | 2004-07-02 | 2006-01-04 | 桂林工学院 | Process for removing nitrogen and phosphor from sewage capable of being built by separate periods |
| CN201154937Y (en) * | 2007-12-07 | 2008-11-26 | 山东省环境保护科学研究设计院 | Advanced treatment device for pulping waste water for paper making |
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| Title |
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| JP特开2003-1289A 2003.01.07 |
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