CN101948163A - Process method for improving biochemical property of industrial waste water - Google Patents
Process method for improving biochemical property of industrial waste water Download PDFInfo
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- CN101948163A CN101948163A CN 201010265337 CN201010265337A CN101948163A CN 101948163 A CN101948163 A CN 101948163A CN 201010265337 CN201010265337 CN 201010265337 CN 201010265337 A CN201010265337 A CN 201010265337A CN 101948163 A CN101948163 A CN 101948163A
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Abstract
The invention discloses a process method for improving the biochemical property of industrial waste water. The process method comprises the following steps of: performing mud-water separation on the waste water, which is subjected to secondary biochemical treatment, through a sedimentation tank; metering the quantity of the waste water by using a water-in metering pump and allowing the waste water to enter from a water inlet; allowing the separated water and circulating water in a reactor, which pass through a circulating pump and a Venturi tube, and ozone to enter a main reactor to perform an oxidation reaction, wherein after being mixed and entering the main reactor, the waste water and the ozone flows upwards to pass through a tank body which is provided with ceramsite first, flows downwards and then flows through a guide plate to change the water flow direction, so that the reaction time is prolonged; discharging the waste water subjected to the treatment from a water outlet of the reactor, wherein the preoxidation process ends up; and entering the next step to perform the biochemical treatment again on the waste water so as to discharge the waste water up to the standard or recycling the waste water. By the method, ozone oxidation pretreatment is performed on the waste water before advanced treatment is performed on the waste water, so that the biochemical property of the waste water is improved, advantageous conditions are provided for the subsequent advanced treatment, and the effect of the advanced treatment is obviously improved.
Description
Technical field
The invention belongs to field of environment engineering, particularly a kind of processing method that improves the trade effluent biodegradability.
Background technology
Along with country's strict day by day to the emission standard of paper pulp papermaking industry, the research of the waste water advanced processing in stage casing is also become difficult point and focus.And middle-stage wastewater is through after the secondary biochemical treatment, biodegradability descends significantly, utilize biological process that this waste water is carried out advanced treatment for continuing, effect is certain to be affected, and just seems particularly important so before advanced treatment this waste water is carried out pre-treatment to improve biodegradability.At present, the method for raising wastewater biodegradability has: Coagulation Method, oxidation style, electrochemical process, biological process and membrane separation process etc.
3.1 Coagulation Method
Paper-making effluent part pollutent is present among the waste water with the colloid form.These electronegative colloidal pollutents are dispersed in the water, form the colourity and the turbidity of water, wherein have the part colloidalmaterial also to belong to aerobic substance in the water.Coagulation Method is exactly to throw a certain amount of coagulating agent of people to comprise inorganic and organic substance in waste water, make colloidal pollutent that is difficult to natural sedimentation in the waste water and reaction process such as a part of fine suspension is steady through taking off, cohesion, bridge formation, formation has a certain size flocs unit, precipitate and separate in the post precipitation pond again, thereby the method that makes the colloidal pollutent be able to from waste water, separate.By coagulation, can reduce turbidity, the colourity of waste water, remove polymer substance, the organic pollutant that is suspension or colloidal and some heavy metal substance.Coagulating agent commonly used mainly contains the molysite, aluminum oxide, calcium oxide, sulfuric acid, phosphoric acid, poly-phthalein amine organic polymer (as polypropylene phthalein amine) of Tai-Ace S 150, sal epsom, divalent or 3 valencys etc. in the pulp and paper effluent treatment.
3.2 micro-electrolysis method
Little electrolysis process is to utilize waste iron filing to form galvanic cell in acidic solution to produce the extremely strong atom [H] of reductibility, its can with the pollutent generation redoxomorphism in the water, improve the biodegradability of sewage.Electrode reaction is given birth to Fe simultaneously
2+, Fe
2+And then be oxidized to Fe
3+, form Fe (OH)
3Precipitation, this precipitates adsorbable macromole and the less organism of solubleness, thereby reduces the COD and the colourity of sewage; In waste iron filing, mix gac or coke, can strengthen electrochemical reaction by certain iron carbon ratio, intensifying treatment effect, and porosity between the filler of maintenance is arranged, prevent the iron filings hardening function; Aeration can increase little electrolytic potential difference, strengthens micro electrolysis tech and adds H exactly on the little electrolysis process of tradition basis
2O
2, the Fe that little electrolysis produces
2+Can and H
2O
2Form Fenton reagent, simultaneously, the Fe of generation
2+, Fe
3+All be good flocculation agent, alkaline condition can produce good sedimentation effect down.
3.3 acidication pre-treatment
The anaerobic hydrolysis-acidification pretreatment technology is according to the oxidative metabolism mechanism of anaerobion to organic pollutant, utilization is controlled at anaerobion the low molecule simple organic that under the envrionment conditions of acidication the complicated organic substrates of difficult for biological degradation polymer is converted into readily biodegradable, improve the function of wastewater biodegradability, make it and multi-form aerobic treatment process applied in any combination, thereby reach the purpose that organic wastewater with difficult degradation thereby is effectively handled.
3.4 electrochemical process
Electrochemical process is to produce active very strong nascent state free radical by electrode reaction, redox reaction takes place in the color development organism in the waste water under the effect of these free radicals, be degraded to colourless small-molecule substance or form flocs unit and precipitate, handle the colourity of back water and all obtained reduction.Britain takes the lead in proposing to dispose of sewage with electrode, and implements the U.S. and subsequently oily(waste)water has been carried out the electrochemical process processing in municipal sewage treatment, but because of energy consumption and cost is higher is paid attention to.Along with electrochemistry and development of electric power industry, the appearance of various high efficiency reactors makes processing cost descend significantly, and electrochemical process is paid attention to by people again.
Summary of the invention
The present invention is directed to the character of alkaline straw-pulp waste water and the characteristics that middle-stage wastewater descends significantly through biodegradability after the secondary biochemical treatment, its objective is and make waste water before advanced treatment, carry out the ozone oxidation pre-treatment to improve the biodegradability of this waste water, for follow-up advanced treatment provides advantageous conditions, thus make the advanced treatment effect be improved significantly.
Technical scheme of the present invention is achieved in that
After the waste water process settling tank mud-water separation of secondary biochemical treatment, wastewater flow rate adopts the metering of water inlet volume pump after water-in enters, water after the separation enters through recycle pump, Venturi tube and ozone with reactor internal recycle water and carries out oxidizing reaction in the main reactor, ozone add-on 60～100mg/L, at the pre-installed water intaking valve of recycle pump, be used to suck the sewage of throwing into by volume pump, in main reactor, regulating waste water ph is 8～9, and water temperature is 25～30 ℃;
Waste water and ozone are after Venturi tube is mixed into main reactor, the pond body of at first upwards flowing through haydite being installed, then to dirty, change the direction of a stream of water once more by flow deflector afterwards, to prolong the reaction times, ozone and the waste water contact reacts time in reactor is 10～30min, processed waste water is discharged by the reactor water outlet, preoxidation process is finished, and waste water enters next link and carries out biochemical treatment once more, thus qualified discharge or reuse.
The present invention adopts ozonation technology that the secondary biochemical waste water of alkaline straw-pulp middle-stage wastewater is carried out pre-treatment respectively.Test-results shows: (1) determines that ozone pre-treatment top condition is: adding concentration is 80mg/L, with the waste water contact reacts time be 20min, the pH value is 8.5,28 ℃ of water temperatures, the biodegradability of waste water is brought up to the highest by 0.282 by original 0.131, improved 115%, the design variable span when meeting in the advanced treatment that BAF is applied in waste water.(2) waste water passes through biochemical treatment, COD again through the ozone pre-treatment
CrClearance nearly 20% compared with not improved through the ozone pre-treatment, reached about 60%, its chroma removal rate also has rising in various degree, water outlet COD
CrWith colourity always at 150mg/L with below 60 times, meet the new pulp and paper industry water emission standard of putting into effect (GB3544-2008) of country fully.(3) through the Financial cost analysis, increase the cost for wastewater treatment that ozone pre-oxidation handles and only increased by 0.25 yuan/t water, to compare running cost comparatively cheap with other method for pre-oxidizing, can be vast enterprises in pulp and paper industry and accept, and application prospect is very wide.
Description of drawings
Accompanying drawing 1 is sewage treatment technology process figure of the present invention.
Below in conjunction with accompanying drawing particular content of the present invention is described in further detail.
Embodiment
1. be that source of oxygen adopts SW-001 type ozonizer to produce required ozone with the air.
2. design experiment ozone oxidation reaction device is voluntarily determined the design variable of its various piece.Mainly comprise: the volume of reactor, highly, the density of planeform, water distribution system, outlet system, the recycle system, upflow velocity, haydite and thickness etc.
3. true by orthogonal test, drawing from the analysis of extreme difference size influence the factor of ozone pre-oxidation effect primary and secondary order, the concentration of offeing medicine＞contact reacts time＞pH value＞water temperature.And then, it is carried out single factor experiment, thereby determine the alkaline straw-pulp middle-stage wastewater of ozone oxidation after secondary biochemical treatment to improve the optimal processing parameter of wastewater biodegradability according to influence factor primary and secondary order.
4. the treatment effect under optimum process condition, and processing cost is adjusted.
Shown in accompanying drawing, after the waste water of the secondary biochemical treatment process settling tank mud-water separation, wastewater flow rate adopts the metering of water inlet volume pump after the pre-oxidation reactor water-in enters.This waste water carries out oxidizing reaction with reactor internal recycle water through recycle pump, Venturi tube in ozone enters main reactor, at the pre-installed water intaking valve of recycle pump, be used to suck the sewage of throwing into by volume pump, adorn a Venturi tube behind the pump, be used for inspiration ozone, realize the mixing of aqueous vapor, improve oxidation efficiency, the ozone add-on is measured by gas meter, and ozone dispensing concentration is 80mg/L.In reactor, regulating waste water ph is 8.5, and water temperature is 28 ± 1 ℃, and the pond body that waste water is at first upwards flowed through haydite has been installed, haydite play cutting bubble and catalytic ozonation effect, to improve the utilising efficiency of ozone.Then to dirty, change the direction of a stream of water once more by the effect of flow deflector afterwards, to prolong the reaction times, improve the volumetrical utilization ratio, ozone and waste water is contact reacts time 20min in reactor, and processed waste water is discharged by the reactor water outlet, and preoxidation process is finished, waste water enters next link and carries out biochemical treatment once more, thus qualified discharge or reuse.
The used major equipment of this technical process is as follows:
Ozonizer: 3g/h, power 150W; The catalysis haydite:
Ozone oxidation reaction device: 1500mm * 400mm * 1700mm; Go out water collecting groove: 200mm * 200mm * 400mm; Gas dosing meter: Qmax=1500L/h; Water inlet volume pump: Q=15L/min; Water circulating pump: Q=10L/min.
Claims (1)
1. a processing method that improves the trade effluent biodegradability is characterized in that, carries out according to the following steps:
After the waste water process settling tank mud-water separation of secondary biochemical treatment, wastewater flow rate adopts the metering of water inlet volume pump after water-in enters, water after the separation enters through recycle pump, Venturi tube and ozone with reactor internal recycle water and carries out oxidizing reaction in the main reactor, ozone add-on 60～100mg/L, at the pre-installed water intaking valve of recycle pump, be used to suck the sewage of throwing into by volume pump, in main reactor, regulating waste water ph is 8～9, and water temperature is 25～30 ℃;
Waste water and ozone are after Venturi tube is mixed into main reactor, the pond body of at first upwards flowing through haydite being installed, then to dirty, change the direction of a stream of water once more by flow deflector afterwards, to prolong the reaction times, ozone and the waste water contact reacts time in reactor is 10～30min, processed waste water is discharged by the reactor water outlet, preoxidation process is finished, and waste water enters next link and carries out biochemical treatment once more, thus qualified discharge or reuse.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104787974A (en) * | 2015-04-13 | 2015-07-22 | 中国环境科学研究院 | Phosphorus removal biological aerated filter-catalytic ozonation coupling device and use method thereof |
| CN106495359A (en) * | 2016-11-23 | 2017-03-15 | 北京清大国华环境股份有限公司 | A kind of highly difficult advanced waste treatment apparatus and method |
| CN115140896A (en) * | 2022-07-01 | 2022-10-04 | 江西绿色盾牌环境工程有限公司 | Process for treating landfill leachate by using ammonia nitrogen separation membrane and special equipment thereof |
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| JPH1110171A (en) * | 1997-06-26 | 1999-01-19 | Takuma Co Ltd | Waste water treatment process |
| CN101070216A (en) * | 2007-06-18 | 2007-11-14 | 华南理工大学 | Integrated ozone and aeration biological filtering pool water treatment apparatus and method |
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| CN101708924A (en) * | 2009-12-04 | 2010-05-19 | 上海师范大学 | Integral reactor combining ozone oxidation and biological membrane and using method thereof |
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2010
- 2010-08-27 CN CN 201010265337 patent/CN101948163A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10192874A (en) * | 1997-01-14 | 1998-07-28 | Hitachi Ltd | Highly advanced water-treatment method |
| JPH1110171A (en) * | 1997-06-26 | 1999-01-19 | Takuma Co Ltd | Waste water treatment process |
| CN101070216A (en) * | 2007-06-18 | 2007-11-14 | 华南理工大学 | Integrated ozone and aeration biological filtering pool water treatment apparatus and method |
| CN101323493A (en) * | 2008-07-24 | 2008-12-17 | 华南理工大学 | Waste water treatment apparatus based on ozone oxidation and aerating biological filter |
| CN101376556A (en) * | 2008-09-24 | 2009-03-04 | 华南理工大学 | Ozone oxidation sterilizing and downflow type aerating biological filter combined waste water treatment apparatus |
| CN101638284A (en) * | 2009-05-27 | 2010-02-03 | 北京能拓高科技有限公司 | Advanced sewage purification sterilization system |
| CN101708924A (en) * | 2009-12-04 | 2010-05-19 | 上海师范大学 | Integral reactor combining ozone oxidation and biological membrane and using method thereof |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104787974A (en) * | 2015-04-13 | 2015-07-22 | 中国环境科学研究院 | Phosphorus removal biological aerated filter-catalytic ozonation coupling device and use method thereof |
| CN106495359A (en) * | 2016-11-23 | 2017-03-15 | 北京清大国华环境股份有限公司 | A kind of highly difficult advanced waste treatment apparatus and method |
| CN115140896A (en) * | 2022-07-01 | 2022-10-04 | 江西绿色盾牌环境工程有限公司 | Process for treating landfill leachate by using ammonia nitrogen separation membrane and special equipment thereof |
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Application publication date: 20110119 |