CN101264950A - Method for removing blue algae by air-float - Google Patents
Method for removing blue algae by air-float Download PDFInfo
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- CN101264950A CN101264950A CNA2008100580764A CN200810058076A CN101264950A CN 101264950 A CN101264950 A CN 101264950A CN A2008100580764 A CNA2008100580764 A CN A2008100580764A CN 200810058076 A CN200810058076 A CN 200810058076A CN 101264950 A CN101264950 A CN 101264950A
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Abstract
The invention relates to a method for removing blue algae by flotation, particularly to a method for removing floating suspended matters such as blue algae in raw water of lake, water reservoir and other water bodies by pressure dissolved air floatation, belonging to the field of environmental protection engineering. The inventive method removes blue algae by pressure dissolved air floatation, and the pressure dissolved air floatation device comprises a pressure air dissolving system, a dissolved air release system and a flotation separation system. The pressure air dissolving system is used for dissolving a large amount of air in water in a pressure air dissolving tank to form air dissolved water as working medium; the dissolved air release system is used for releasing air dissolved in the air dissolved water with certain pressure in the form of microscopic bubbles by suddenly reducing pressure and allowing the released air to rapidly and uniformly adhere to blue algae or impurities in water; and the flotation separation system is used for allowing the microscopic bubbles to completely mix, contact and adhere to floccules in water and separating air-entrapped particulates with clear water, so as to remove blue algae or other impurities in the raw water. The inventive method can be used for effectively removing blue algae in the water body, and effectively controlling lake and water reservoir pollution.
Description
Technical field:
The present invention relates to a kind of method of removing blue algae by air-float, particularly a kind of pressure air-dissolving air-float mode is removed the swim method of suspended substance of blue algae in the former water of water body such as lake, reservoir.Belong to field of environmental engineering.
Technical background: since the eighties, harmful algae breaking out in natural water body is serious day by day, has become the environmental hazard of attracting attention in the whole world.The wawter bloom algae severe exacerbation of excessive breeding water quality, influenced the function such as ecology, fishery, view of water body, even threatened safety of drinking water.Researching and developing safe, efficient, cheap blue-green algae removal technology is one of great environmental problem that body eutrophication is administered and the control algal bloom is anxious to be solved.
At present, the method for removing blue-green alga bloom both at home and abroad has methods such as chemistry, biology and physics.Adopt chemical process in the lake, to throw in pharmaceutical chemicals or reagent, must bring in various degree harm water quality; There is not the chemical pollution problem though biological method is removed blue-green alga bloom, throws in weed eater in the lake in a large number, might affect lake biotic population structure, species diversity; Microorganisms etc. then are subjected to the lake environment condition influence to be difficult to play comparatively ideal effect.Mechanical removal in the physical method, direct filtration and precipitation are removed methods such as algae, can directly remove the lake surface blue-green alga bloom, and not have obvious negative effect.But exist paying no attention to except that the algae effect of high algae water thought of the deficiency that is difficult to carry out aspects such as mass-producing operation.
In general, the purification of low turbidity and algae-containing water is the thing of difficulty since water-borne glue body impurity seldom, the chance of cohesion collision seldom, proportion approaches water again, therefore difficult formation wadding grain even form, also gently loosens, easily broken, and difficult heavy, strengthen dosage and also seldom take effect, and adopt the air supporting method, it is favourable just changing unfavorable factor, makes the separation of floating rapidly of light wadding grain.
Summary of the invention:
The objective of the invention is to overcome the prior art deficiency, inventing a kind of is to utilize air flotation technology, especially pressure air-dissolving air-float technology, blue-green algae is the planktonic algae of advantage in the water bodys such as lake, reservoir with removing on specificity ground, and take wherein nutrient rich such as nitrogen, phosphorus out of, processing contains the swim water body of suspended substance of blue algae, and utilizes or carry out subsequent disposal separating blue-green algae slag after removing.
For achieving the above object, the method of removing blue algae by air-float of the present invention provides following technical scheme: it is characterized in that adopting the pressure air-dissolving air-float mode to remove blue-green algae, pressure air-dissolving air-float is made up of pressure air-dissolving system, molten gas release system and air supporting separation system three parts, the pressure air-dissolving system dissolves in a large amount of air in the water in pressure air-dissolving tank power, formation is dissolved with the dissolved air water of gas, allows the dissolved air water that is dissolved with gas make the work medium; Molten gas release system is to have the dissolved air water of certain pressure by the sudden pressure reduction mode; Allow the gas that is dissolved in the dissolved air water water discharge with the microbubble form. and quickly and evenly with water in blue-green algae or impurity stick mutually; The dissolved air flotation system be allow floccules thorough mixing in microbubble group and the water, contact, stick and be with gas particles to separate with clear water, remove blue-green algae or other impurity in the former water.
Air supporting mode master operation comprises in the pressure air-dissolving system: absorption contains the former water of algae, adding flocculation agent mixes, flocculation reaction, air supporting, scrape slag and emission treatment water step, wherein water pump will need to handle the Yuan Shui water source---blue algae water is in flocculation agent sucks the air supporting reaction tank, water after the flocculation flows into air supporting contact tank (3) from air supporting reaction tank bottom pipe, a part of water in the air supporting contact tank (3) enters in the pressure air-dissolving tank (2) through backflow water pump (7) pressurization and mixes with pressurized air, form dissolved air water, dissolved air water disengages from dissolved air release (8) webmaster of dissolved air flotation pond (4) bottom, the a large amount of microbubbles that disengage, in the air supporting contact tank (3) another partly water flows into dissolved air flotation pond (4) through pipeline, microbubble gas and flocculation agent meet, the wadding grain is sticked with bubble, pulp water separates, scum silica frost is distributed in air flotation separating chamber (4) pond face, scum silica frost overflows or scrapes from ash pit (6), and clear water is exported by pipeline after clear water output (5) flows into clean water basin again.
The pressure air-dissolving system is made up of water pump, air compressor machine, pressure air-dissolving tank and other auxiliary facility, and the processing parameter of described pressure air-dissolving tank (2) should be controlled at following scope, 1. dissolving pressure 0.2-0.4Mpa; 2. Guan mistake flow density 3000-5000m
3/ (d.m
2); 3. bed stuffing height 0.8-1.3m; 4. liquid level span of control 0.6.1.0m (jar the end more than); 5. more than the dissolving bearing capacity 0.8Mpa.
Molten gas release system is made up of dissolved air release and Gas dissolving pipe road, and specific requirement is: 1. below the reliever preceding pipeline flow velocity 1m/s; 2. the exit velocity 0.4-.05m/s of reliever; The opening width 5mm in pinch slit when 3. washing; 4. the sphere of action 30-110cm of each reliever.
The dissolved air flotation system is made up of zone of action, come-up disengaging zone, slag scraper (1), dreg collecting slot, clear water header and water monitor, and its controlled variable is: the 1. upflow velocity 10-20mm/s of zone of action; 2. flow velocity 1.5-2.5mm/s under the current direction of disengaging zone; 3. single lattice width should not surpass 10m; 4. pond length should not surpass 15m; 5. effectively the depth of water is 2.0-2.5m; 6. the road speed of slag scraper is not more than 0.08m/s; 7. the ratio of the outgas water yield and the pending water yield, then reflux ratio is 5-10%.
Described flocculation agent is meant solid-state and liquid aluminum compound, as: Tai-Ace S 150, polymerize aluminum chloride etc., the dosage of its Tai-Ace S 150, polymerize aluminum chloride is 5-60PPM.
Principle of work is: under the certain pressure effect, in dissolving power, a large amount of air are dissolved in the water, form the water that only is dissolved with gas, allow the dissolved air water that the is dissolved with gas medium of working, by sudden pressure reduction, the dissolved air water snap-out release produces a large amount of micro bubbles, these micro bubbles adhere to through on the flocs unit in the water behind the coagulating, flocs unit to the water surface, is removed the suspended impurity that float on the surface with mechanical system at the effect float downward of microbubble, reaches the purpose of purifying water body.
The pressure air-dissolving air-float method, mainly form by three parts, be pressure air-dissolving system (forming), molten gas release system (forming), dissolved air flotation system (forming), it is characterized in that by zone of action, come-up disengaging zone and slag scraper, dreg collecting slot, clear water header, water monitor etc. by dissolved air release and Gas dissolving pipe road by water pump, air compressor machine, pressure air-dissolving tank and other auxiliary facility:
1) pressure air-dissolving tank is the key equipment of the molten gas efficient of influence, and its processing parameter should be controlled at following scope, 1. dissolving pressure 0.2-0.4Mpa; 2. Guan mistake flow density 3000-5000m
3/ (d.m
2); 3. bed stuffing height 0.8-1.3m; 4. liquid level span of control 0.6.-1.0m (jar the end more than); 5. more than the dissolving bearing capacity 0.8Mpa.
2) molten gas release system be with pressure air-dissolving water by energy dissipating, reduce pressure, make the gas that dissolves in the water to discharge with the form of microbubble, and can be quickly and evenly with water in impurity stick mutually.Specific requirement is 1. below the reliever preceding pipeline flow velocity 1m/s; 2. the exit velocity 0.4-.05m/s of reliever; The opening width 5mm in pinch slit when 3. washing; 4. the sphere of action 30-110cm of each reliever.
3) guaranteeing that a constant volume finishes floccules thorough mixing in microbubble group and the water, contacts, sticks and be with gas particles to separate with clear water, is the function of dissolved air flotation system.Its controlled variable is: the 1. upflow velocity 10-20mm/s of zone of action; 2. flow velocity 1.5-2.5mm/s under the current direction of disengaging zone; 3. single lattice width should not surpass 10m; 4. pond length should not surpass 15m; 5. effectively the depth of water is 2.0-2.5m; 6. the road speed of slag scraper is not more than 0.08m/s; 7. the reflux ratio ratio of the pending water yield (the outgas water yield with) is 5-10%.
The working process of pressure air-dissolving air-float method is: water pump is gone into the Yuan Shui water source blue algae water of processing in flocculation agent sucks labyrinth type air supporting reaction tank with needs, water after the flocculation flows into the air supporting contact tank from air supporting reaction tank bottom pipe, and a part of water in the air supporting contact tank enters in the pressure air-dissolving tank through the pressurization of backflow water pump and mixes with pressurized air; Form dissolved air water, dissolved air water disengages from the dissolved air release webmaster of bottom, dissolved air flotation pond, the a large amount of microbubbles that disengage, in the air supporting contact tank another partly water flows into the dissolved air flotation pond through pipeline, and microbubble gas and flocculation agent meet, and the wadding grain is sticked with bubble, pulp water separates, scum silica frost is distributed in air flotation separating chamber pond face, regularly scum silica frost is scraped from ash pit, and clear water is exported by pipeline after flowing into clean water basin again.
Air supporting method water purification is compared with general precipitator method water purification, and air supporting method water purification has the following advantages: a) specific yield is up to more than 3 times; B) residence time of source water in equipment can shorten more than 70%; C) floor space reduces more than 60%; D) the waste residue volume reduces more than 80%; For the suspended substance (as algae) that proportion is lighter in the water of source, when being difficult to handle, use air supporting method effect better with the precipitator method.F) because air supporting is to rely on the bubble adhesion flocculation, so can reduce to dosing reaction requirement.Thereby saved coagulant dosing, simplified conversion unit.
The invention provides the method for blue-green algae in a kind of effective removal water body, for the improvement of lake, reservoir pollution provides a kind of effective endogenous improvement method.Its advantage is that algae proportion is lighter in the water of a. source, uses air supporting method removal effect obvious; B. because be a kind of flow operating mode, so handle former water efficient height; C. because air supporting is to rely on the bubble adhesion flocculation, can reduces so requirement is reacted in dosing, thereby save coagulant dosing, simplify conversion unit; D. technical data is stable, and the adaptability of project scale and treatment capacity is strong, and according to the practical situation of handling water body, its scale can be from 5m
3/ h-4350m
3/ h; E. air supporting construction investment cost and running cost are lower.
Description of drawings:
Below in conjunction with the accompanying drawing illustrated embodiment, the invention will be further described, but protection domain is not limited thereto embodiment.
Fig. 1 removes the process frame chart of the method for blue-green algae for air supporting method of the present invention.
The schematic flow sheet that Fig. 2 uses for Processing Equipment of the present invention.
Among Fig. 2: the 1-slag scraper; The 2-pressure air-dissolving tank; 3-air supporting contact tank; 4-dissolved air flotation pond; The 5-clear water output; The 6-ash pit; 7-backflow water pump; The 8-air compressor machine.
Embodiment
Embodiment 1: at Kunming Dianchi lake north bank, near the Dian Chi water surface, build a special pressure air-dissolving system of removing blue-green algae.With raw water pump algae-containing water is delivered to the coagulating district, simultaneously flocculation agent is added to transport pipe by line mixer and mix with algae-containing water, algae-containing water and flocculation agent utilize formed intensive turbulent flow to carry out uniform mixing in the labyrinth type reaction tank, closely knit to generate, oarse-grained alumen ustum.
In contact chamber, rely on air compressor machine, reflux pump and the formed high pressure dissolved air water of dissolving by discharging a sudden pressure reduction, snap-out release, producing a large amount of micro bubbles adheres to through on " alumen ustum " in the algae-containing water behind the coagulating, make the flco come-up, above blue-green algae all floats in the algae-containing water, give and water sepn by the disengaging zone again, slag scraper by air supporting top scrapes off blue-green algae and is discharged in the sludge sump at last, and import in the pending waters through pipeline by the clear water of handling, reach the purpose of removing blue-green algae.
(1) raw water pump: ability is Q=210m
3/ h, H=19m;
(2) reaction tank: reaction tank adopts labyrinth type reaction tank (4m X 1m X 2.7m).Water body residence time 7min.
(3) chemicals dosing plant: form by drug dissolving tank and metering dosing pump.Adding concentration is 10PPm, adopts polymerize aluminum chloride.
(4) air flotation pool: air flotation pool (4m X 12m X 2.7m) is made of exposure chamber and separate chamber's two portions, and the flow velocity that enters the air supporting contact tank is less than 0.1m/s, and contact tank current lift velocity is 15mm/s, and the residence time is greater than 60s.The following of separate chamber's current is 2mm/s to the flow velocity degree, and surface load is at 10.8m
3/ m
2H.Isolating water body is by header collection down, and gravity flows into pending waters.
(5) dissolving: adopt spray material filling type dissolving, diameter is Φ 1200mm, and packed height is 1m, and filler adopts the big new packing of specific surface area, dissolving pressure 0.3Mpa.
(6) molten gas discharges reliever: 1. below the reliever preceding pipeline flow velocity 1m/s; 2. the exit velocity 0.45m/s of reliever; The opening width 5mm in pinch slit when 3. washing; 4. the sphere of action 70cm of each reliever.
(7) reflux pump: adopt Q=90m
3/ h, 1 of H=48.5m impeller pump, reflux ratio is 8%.
(8) scrape slag system: be positioned at the air flotation pool top.When air flotation pool come-up algae mud reaches certain thickness, open the mud system of scraping; Algae mud temporarily stores through pipe-line transportation to circulating pool; The road speed of slag scraper is not more than 0.08m/s.
Technical process is identical with embodiment 1, no longer repeats at this, and raw water pump, air flotation pool parameter and equipment are identical with embodiment 1, and other technical parameter sees Table 1.
Table 1: embodiment 2 and embodiment 3 technical parameter tables
| | Embodiment | 2 | Implement 3 |
| The water body residence time | 5min | 10min | |
| Dispensing concentration | 5PPM | 60PPM | |
| The mistake flow density of jar- | 3000m 3/(d.m 2) | 5000m 3/(d.m 2) | |
| Bed stuffing height | 0.8m | 1.3m | |
| Dissolving pressure | 0.2Mpa | 0.4Mpa | |
| The |
5％ | 10％ | |
| The liquid level span of control | 0.6.m | 1.0m | |
| Reliever preceding pipeline flow velocity; | 0.5m/s | 1m/s | |
| The exit velocity of reliever | 0.4m/s | 0.5m/s | |
| The sphere of action of each reliever | 30cm | 110cm | |
| The upflow velocity of zone of action | 10mm/s | 20mm/s | |
| Flow velocity under the current direction of disengaging zone | 1.5mm/s | 3mm/s |
Table 2: remove blue-green algae result 1
| Date | Water inlet algae counts/L | Water outlet algae counts/L |
| 2007.8.25 | 3.28×10 7 | 6.24×10 4 |
| 2007.11.10 | 6.49×10 7 | 6.16×10 4 |
| 2007.12.26 | 1.56×10 7 | 2.24×10 4 |
Table 3: remove blue-green algae result 2
| Sequence number | Project name | Unit | The result |
| 1 | The water treatment amount | m 3/d | 9600 |
| 2 | The blue alga clearing rate is | ％ | ＞95％ |
| 3 | The blue alga clearing amount | m 3/d | 72 |
Table 4: air flotation effect
Claims (6)
1, a kind of air supporting method is removed the method for blue-green algae, it is characterized in that adopting the pressure air-dissolving air-float mode to remove blue-green algae, pressure air-dissolving air-float is made up of pressure air-dissolving system, molten gas release system and air supporting separation system three parts, the pressure air-dissolving system pressurizes in pressure air-dissolving tank, a large amount of air are dissolved in the water, formation is dissolved with the dissolved air water of gas, allows the dissolved air water that is dissolved with gas make the work medium; Molten gas release system be will have the dissolved air water of certain pressure by the sudden pressure reduction mode, the gas in the dissolved air water is discharged with the microbubble form, and rapidly, equably with water in blue-green algae or impurity stick mutually; The dissolved air flotation system be allow floccules thorough mixing in microbubble group and the water, contact, stick and be with gas particles to separate with clear water, remove blue-green algae or other impurity in the former water.
2, the method of removing blue algae by air-float according to claim 1, it is characterized in that air supporting mode master operation comprises in the pressure air-dissolving system: absorption contains the former water of algae, adding flocculation agent mixes, flocculation reaction, air supporting, scrape slag and emission treatment water step, wherein water pump will need to handle the Yuan Shui water source---blue algae water is in flocculation agent sucks the air supporting reaction tank, water after the flocculation flows into air supporting contact tank (3) from air supporting reaction tank bottom pipe, a part of water in the air supporting contact tank (3) enters in the pressure air-dissolving tank (2) through backflow water pump (7) pressurization and mixes with pressurized air, form dissolved air water, dissolved air water disengages from dissolved air release (8) webmaster of dissolved air flotation pond (4) bottom, the a large amount of microbubbles that disengage, in the air supporting contact tank (3) another partly water flows into dissolved air flotation pond (4) through pipeline, microbubble gas and flocculation agent meet, the wadding grain is sticked with bubble, pulp water separates, scum silica frost is distributed in air flotation separating chamber (4) pond face, scum silica frost overflows or scrapes from ash pit (6), and clear water is exported by pipeline after clear water output (5) flows into clean water basin again.
3, the method for removing blue algae by air-float according to claim 1 and 2, it is characterized in that the pressure air-dissolving system is made up of water pump, air compressor machine, pressure air-dissolving tank and other auxiliary facility, the processing parameter of described pressure air-dissolving tank (2) should be controlled at following scope, 1. dissolving pressure 0.2-0.4Mpa; 2. Guan mistake flow density 3000-5000m
3/ (d.m
2); 3. bed stuffing height 0.8-1.3m; 4. liquid level span of control 0.6.1.0m (jar the end more than); 5. more than the dissolving bearing capacity 0.8Mpa.
4, the method for removing blue algae by air-float according to claim 1 and 2 is characterized in that molten gas release system is made up of dissolved air release and Gas dissolving pipe road, and specific requirement is: 1. below the reliever preceding pipeline flow velocity 1m/s; 2. the exit velocity 0.4-.05m/s of reliever; The opening width 5mm in pinch slit when 3. washing; 4. the sphere of action 30-110cm of each reliever.
5, removing blue algae by air-float according to claim 1 and 2 method, it is characterized in that the dissolved air flotation system is made up of zone of action, come-up disengaging zone, slag scraper (1), dreg collecting slot, clear water header and water monitor, its controlled variable is: the 1. upflow velocity 10-20mm/s of zone of action; 2. flow velocity 1.5-2.5mm/s under the current direction of disengaging zone; 3. single lattice width should not surpass 10m; 4. pond length should not surpass 15m; 5. effectively the depth of water is 2.0-2.5m; 6. the road speed of slag scraper is not more than 0.08m/s; 7. the ratio of the outgas water yield and the pending water yield, then reflux ratio is 5-10%.
6. the method for removing the algae suspended substance according to claim 1 or 2 described air supportings is characterized in that described flocculation agent is meant solid-state and liquid aluminum compound, and aluminum compound is Tai-Ace S 150 or polymerize aluminum chloride, and the aluminum compound dosage is 5-60PPM.
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