CN102452694A - Air floatation treatment method for wastewater - Google Patents
Air floatation treatment method for wastewater Download PDFInfo
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- CN102452694A CN102452694A CN2010105136781A CN201010513678A CN102452694A CN 102452694 A CN102452694 A CN 102452694A CN 2010105136781 A CN2010105136781 A CN 2010105136781A CN 201010513678 A CN201010513678 A CN 201010513678A CN 102452694 A CN102452694 A CN 102452694A
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Abstract
The invention discloses an air floatation treatment method for wastewater. In the method, an air floatation tower, a wastewater pump, an air compressor, a flocculating agent pump and a flocculating agent tank are involved, wherein the air floatation tower consists of a plurality of tower plates; the wastewater and air enter a tower body from the upper part and the lower part of the air floatation tower and are in countercurrent contact with each other; and when gas passes through the tower plates, a large number of micro bubbles are formed, so that suspended substances or oil in the wastewater is adhered and brought to a water surface, and the aim of solid-liquid separation is fulfilled. The method has the characteristics of good treatment effect and small occupied area and can be used for removing the suspended substances or dirty oil from the wastewater.
Description
Technical field
The present invention is a kind of waste water air-flotation treatment method, is specially adapted to remove suspended substance or sump oil in the waste water, belongs to technical field of waste water processing.
Background technology
Usually contain a large amount of suspended substances or sump oil in the trade effluent, air supporting is effectively to remove one of method of suspended substance in the waste water or sump oil.Press to bubbling air in the water through adding, air discharges with the micro-bubble form under normal pressure or vacuum condition, and suspended substance in adhesion or the planar water or oil, its density is reduced and floats to liquid level, thereby realize the purpose of pollutent and water sepn.Existing air flotation technology has diffuser plate/diffuser tube air supporting, jet air float, cavitation air flotation, pressurized dissolved air flotation and electrolysis-coagulation air supporting etc.; Wherein, It is big that diffuser plate/diffuser tube air supporting produces bubble, violent to water disturbance, for dividing dried up middle smaller particles impurity and the loose particulate that is prone to crashed through; Effect is relatively poor, is mainly used in mineral floating.The jet air float kinetic equation loss is bigger, and nozzle and trunnion place are prone to stopped up by greasy dirt.Pressurized dissolved air flotation can be divided into full air-dissolving air-float, part air-dissolving air-float and partial reflux air-dissolving air-float again, and what refinery extensively adopted at present is the partial reflux dissolved air flotation, but ubiquity the shortcoming that processing efficiency is low, floor space is big.The cavitation air flotation technology does not need dissolving and air; Have simple to operate and characteristics less investment; Be widely used in the waste water oil removing or removed the suspended substance in the waste water, but, need be provided the enough solid-liquid separation time for guaranteeing solid-liquid separation effect; Need build inevitably and the equal big or small air flotation pool of conventional press air-dissolving air-float, floor space still can't reduce.
The air-float technology that CN200810012474.2, CN2851248Y provide can't overcome the big shortcoming of floor space; The Air-float deinking tower that is used for pulp treatment waste water that US4399028 introduces, suction culvert and molten gas device structure are complicated, and in order to collect scum silica frost and to prevent the scum silica frost line clogging, need water flushing scum silica frost.From present application feature, the pressurized dissolved air flotation technology is used the widest in field of waste water treatment, but the big shortcoming of floor space can't be avoided.
Summary of the invention
Deficiency to existing air flotation technology the present invention proposes a kind of air-float technology method, when guaranteeing water treatment effect, can significantly reduce the air-floating apparatus floor space, and the variation of water quantity and quality is had stronger adaptive faculty.
The invention provides a kind of waste water air-flotation treatment method, the equipment of use comprises air supporting tower, waste water pump, air compressor machine, flocculation agent pump and flocculation agent jar etc., and first from air supporting tower top tower tray side of the waste water of mixed flocculation agent gets into the air supporting tower; Air gets into air float body from the tower body bottom, when air passes through tower tray from bottom to up, form micro-bubble; Thereby suspended substance in the adhesion waste water or sump oil; Bring it into the water surface, form scum silica frost, realize solid-liquid separation.
In the inventive method, add flocculation agent in the waste water and can be inorganic flocculating agent, like poly-ferric chloride, bodied ferric sulfate, Poly aluminum Chloride (PAC) or polyaluminium sulfate, inorganic wadding agent dosage is 5～50mg/L waste water.
In the inventive method, add flocculation agent in the waste water and also can be organic floculant, like SEPIGEL 305, sulfonated polyethylene benzene or polyvinyl ether, the organic floculant dosage is 0.1～5mg/L waste water.Also can use inorganic flocculating agent and organic floculant simultaneously by above-mentioned dosage.
In the inventive method, the air pressure at the bottom of the entering air supporting tower is 0.01～0.3MPa, and tolerance is 0.5～150L/m
3Waste water.Retention time of sewage 0.2～5h.The aforesaid operations condition is specifically confirmed according to useless character and desired processing index.
In the inventive method, used air supporting tower structure comprises tower body, and at least two tower trays are set in tower body; Every tower tray is provided with overflow weir, scum silica frost receiving tank and U-shaped pipe and constitutes the air supporting member, and tower tray is provided with overflow weir near a side of tower body, and the logical gap of current is set between overflow weir lower end and next the piece tower tray; Form between overflow weir and the tower body and fall the liquid zone, the tower tray top that falls the relative side in liquid zone with overflow weir is provided with the scum silica frost receiving tank, and scum silica frost receiving tank opening upwards; Scum silica frost receiving tank bottom is provided with the logical gap of suitable current with tower tray, and the U-shaped pipe is set, and U-shaped Guan Yiduan communicates with scum silica frost receiving tank bottom; The U-shaped pipe the other end directly is communicated to the tower body outside; The tower body top is provided with venting port, and lastblock tower tray top, tower body top is provided with fluid inlet, and tower body bottom next piece tower tray below is provided with inlet mouth and leakage fluid dram.
In the described air supporting tower, comprise that the air supporting member of tower tray, overflow weir, scum silica frost receiving tank and U-shaped pipe is provided with 2～30 covers, preferred 2～10 covers.
In the described air supporting tower, diffusing gas plate, the air dipelling disk of tower tray for processing by poromerics, or form by the diaphragm and the support combination of loosing gas plate, air dipelling disk and have a micropore.
In the described air supporting tower, scum silica frost receiving tank slag input side leaves certain altitude a little more than height of weir plate between scum silica frost receiving tank bottom and the tower tray, and water can pass through smoothly.Every layer of tower tray current end along water (flow) direction is tapered configuration, and more past current are terminal, and runner is narrow more.Fall the liquid zone under the column plate bottom gas block panel can be set.
In the described air supporting tower, the xsect of tower body is suitable shape such as rectangle, square, circle, and the U-shaped pipe of scum silica frost receiving tank is discharged tower body with scum silica frost.
Airfloat equipment is a tower structure among the present invention, and waste water and air get into the air supporting tower respectively at the bottom of first tower tray side of cat head and tower.When air passes through tower tray, form a large amount of micro-bubbles, in floating-upward process, adhere to suspended substance or oil in the waste water, bring it into the water surface, realize solid-liquid separation.The present invention has used tower airfloat equipment, and air-float technology does not need dissolving, and air single pass from bottom to top, thereby compares with traditional air-float technology, and the present invention has the advantage that floor space is little, composition is simple, gas consumption is little.Use the present invention; Can also select the quantity of tower tray according to the variation of the waste water quality water yield, the variation of the waste water quality water yield had stronger adaptive faculty, in addition; For chemical industry or refinery water; The waste gas that contains various hazardous and noxious substances that air flotation cell discharged can directly enter exhaust aftertreatment device and carry out harmless treatment, like catalyticcombustion, absorption and heat-accumulation combustion etc., has saved the expense of uncovered air flotation pool sealing.
Description of drawings
Fig. 1 is the process flow diagram of embodiment of the present invention method, wherein:
Among the figure: 1, liquid-inlet pipe; 2, drain pipe; 3, scum silica frost outlet pipe; 4, inlet pipe; 5, overflow weir; 6, scum silica frost receiving tank; 7, tower tray; 8, tower body; 9, venting port; 10, flooded zonevvv; 11, the liquid zone falls; 12, U-shaped pipe; 13, gas block panel; 14, air compressor machine; 15, waste water pump; 16, flocculation agent pump; 17, flocculation agent jar.
Embodiment
Further specify the technical process of the inventive method below in conjunction with accompanying drawing.
Flocculation agent after dissolving joins waste water pump 15 inlet ends by flocculation agent pump 16; Get into waste water pump with waste water; Under the effect of waste water pump impeller high speed rotating, flocculation and cohesion take place in suspended substance in flocculation agent and the waste water or sump oil, form the alumen ustum flco; Through first tower tray (tower tray of topmost) of liquid-inlet pipe 1 entering air supporting tower 8, and from top to bottom in proper order through each layer tower tray.Simultaneously, gas provides power by air compressor machine 14, and inlet pipe 4 gets into air supporting towers 8 at the bottom of the tower; From bottom to up through each tower tray the time, form a large amount of micro-bubbles, and adhere to suspended substance or sump oil in the waste water; Bring it on every layer of tower tray liquid level and form scum silica frost, in the waste water flow process, scum silica frost flows with water; Because the design on the tray structure, scum silica frost gets into scum silica frost receiving tank 6, and further discharges outside the tower through U type pipe 12 and scum silica frost outlet pipe 3; Water then gets into flooded zonevvv 10, and flows into the next stage tower tray through falling liquid zone 11.Waste water is finally discharged the air supporting tower by drain pipe 2 after in the air supporting tower, handling through multistage air supporting from the top down.
The waste gas that contains poisonous objectionable impurities that the air supporting tower is discharged is discharged from cat head venting port 9, and the entering gas treatment equipment is done harmless treatment.
Further specify technology contents of the present invention and effect through embodiment below.
Embodiment 1
Certain class concentration 110mg/L of oily(waste)water PetroChina Company Limited., flocculation agent is selected Poly aluminum Chloride (PAC) for use.The air supporting tower is made up of 10 cover tower trays, equal diffusing gas plates for processing by poromerics, and intake pressure is 0.07MPa at the bottom of the tower.
Main operational condition: flocculant dosage 15mg/L, retention time of sewage 1.5h, liquid-gas ratio 15L/m
3, the class concentration 18mg/L of final outflow water PetroChina Company Limited., clearance surpasses 80%.
Embodiment 2
Suspension content 510mg/L in certain waste water, flocculation agent is selected Poly aluminum Chloride (PAC) for use.The air supporting tower is made up of 5 cover tower trays, equal diffusing gas plates for processing by poromerics, and intake pressure is 0.05MPa at the bottom of the tower.
Main operational condition: flocculant dosage 5mg/L, retention time of sewage 0.5h, liquid-gas ratio 5L/m
3, concentration of suspension 30mg/L in the final outflow water, clearance surpasses 90%.
Claims (10)
1. waste water air-flotation treatment method is characterized in that: the equipment that the waste water air-flotation treatment method uses comprises air supporting tower, waste water pump, air compressor machine, flocculation agent pump and flocculation agent jar etc., and first from air supporting tower top tower tray side of the waste water of mixed flocculation agent gets into the air supporting tower; Air gets into air float body from the tower body bottom, when air passes through tower tray from bottom to up, form micro-bubble; Thereby suspended substance in the adhesion waste water or sump oil; Bring it into the water surface, form scum silica frost, realize solid-liquid separation; In the described air supporting tower, comprise that the air supporting member of tower tray, overflow weir, scum silica frost receiving tank and U-shaped pipe is provided with 2～30 covers, preferred 2～10 covers.
2. according to the described method of claim 1, it is characterized in that: adding flocculation agent in the waste water is inorganic flocculating agent, comprises poly-ferric chloride, bodied ferric sulfate, Poly aluminum Chloride (PAC) or polyaluminium sulfate, and inorganic wadding agent dosage is 5～50mg/L waste water.
3. according to claim 1 or 2 described methods, it is characterized in that: adding flocculation agent in the waste water is organic floculant, comprises SEPIGEL 305, sulfonated polyethylene benzene or polyvinyl ether, and the organic floculant dosage is 0.1～5mg/L waste water.
4. according to the described method of claim 1, it is characterized in that: the air pressure at the bottom of the entering air supporting tower is 0.01～0.3MPa, and tolerance is 0.5～100L/m
3Waste water.
5. according to claim 1 or 4 described methods, it is characterized in that: retention time of sewage 0.2～5h.
6. according to the described method of claim 1, it is characterized in that: the air supporting tower structure comprises tower body, and at least two tower trays are set in tower body; Every tower tray is provided with overflow weir, scum silica frost receiving tank and U-shaped pipe and constitutes the air supporting member, and tower tray is provided with overflow weir near a side of tower body, and the logical gap of current is set between overflow weir lower end and next the piece tower tray; Form between overflow weir and the tower body and fall the liquid zone; The tower tray top that falls the relative side in liquid zone with overflow weir is provided with the scum silica frost receiving tank, and scum silica frost receiving tank opening makes progress, and scum silica frost receiving tank bottom is provided with the logical gap of suitable current with tower tray; The U-shaped pipe is set; U-shaped Guan Yiduan communicates with scum silica frost receiving tank bottom, and the U-shaped pipe the other end directly is communicated to the tower body outside, and the tower body top is provided with venting port; Lastblock tower tray top, tower body top is provided with fluid inlet, and tower body bottom next piece tower tray below is provided with inlet mouth and leakage fluid dram.
7. according to the described method of claim 6, it is characterized in that: in the air supporting tower, diffusing gas plate, the air dipelling disk of tower tray for processing by poromerics, or form by the diaphragm and the support combination of loosing gas plate, air dipelling disk and have a micropore.
8. according to the described method of claim 6, it is characterized in that: in the air supporting tower, scum silica frost receiving tank slag input side leaves certain altitude a little more than height of weir plate between scum silica frost receiving tank bottom and the tower tray, and water can pass through smoothly.
9. according to the described method of claim 6, it is characterized in that: in the air supporting tower, be tapered configuration along every layer of tower tray current end of water (flow) direction, more past current are terminal, and runner is narrow more, fall the liquid zone under the column plate bottom gas block panel is set.
10. according to the described method of claim 6, it is characterized in that: in the air supporting tower, the xsect of tower body is rectangle, square or circular, and the U-shaped pipe of scum silica frost receiving tank is discharged tower body with scum silica frost.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN 201010513678 CN102452694B (en) | 2010-10-14 | 2010-10-14 | Air floatation treatment method for wastewater |
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| CN 201010513678 CN102452694B (en) | 2010-10-14 | 2010-10-14 | Air floatation treatment method for wastewater |
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| CN102452694A true CN102452694A (en) | 2012-05-16 |
| CN102452694B CN102452694B (en) | 2013-06-19 |
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Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1397503A (en) * | 2001-07-19 | 2003-02-19 | 中国科学院生态环境研究中心 | Countercurrent, copolymerizing and air-float process for purifying water and its equipment |
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Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1397503A (en) * | 2001-07-19 | 2003-02-19 | 中国科学院生态环境研究中心 | Countercurrent, copolymerizing and air-float process for purifying water and its equipment |
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| CN102452694B (en) | 2013-06-19 |
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