CN1212975C - Comprehensive pressure solution and electrolysis air floating system - Google Patents

Abstract

The present invention relates to an air floating device which is composed of an air floating tank body (31), a pressure solution releasing system (32), a dreg scraper (33), a dreg stirrer (34), an electric control system (35), an electrolysis electrode system(36), a chemical preparing and feeding system (37), a water inlet pipe system (38), a sludge pump (39), and matching pipelines, valves and cables. The present invention has the advantages of broad application range, high removal efficiency, stable operation, long service life, simple and convenient management, low investment, small land occupation and low operation cost.

Description

Comprehensive air floating system for pressure dissolution electrolysis

Technical field

The present invention relates to a kind of novel air supporting complexes, be adapted in the plumbing treatment process system technique unit as electrochemistry materialization and solid-liquid separation.Be adapted to papermaking, printing and dyeing, medicine, petrochemical industry, chemical industry, chemical fibre, leather, brewage, various Industrial Wastewater Treatment such as food-processing, mechanism's processing and plating, remove organic contamination and solid-liquid separation, also be adapted to the water treatment of giving that rivers and lakes water removes the algae turbidity removal.

Background technology

In the prior art, electrofloatation is effectively handled the Industrial Wastewater Treatment of various Organic pollutants, removes a large amount of solvabilities and half solvability organic pollution materials in the water.Process principle figure as shown in Figure 1, 2 altogether.Electrofloatation device is by air flotation pool body 11, electrode group 12, and slag scraper 13 stirs slag ladle 14, electric control system 15, line mixer 16, sludge pump 17 and ducts valve are formed.

Wherein electrode group 12 is made up of electrode suppor, positive electrode, negative potential.Generally with aluminium sheet or iron plate, negative potential is generally used graphite cake to positive electrode, and also useful metal aluminium or iron plate are made.

Electrode group 12 is arranged example in air flotation pool body 11 be to connect the 3-5 level again after the first parallel connection and form total water treatment process.

The slag scraper 13 general continuous slag scrapers of chain-belt type that adopt.

Electrical control system 15 is with the alternating-current step-down and be rectified into direct current (12V), provides big electric current by cable electricity row 152 counter electrode groups 12, finishes water pump, slag scraper on the other hand, stirs slag ladle etc. and drag automatically controlled.

In former water, drop into small amount of sodium chloride, after line mixer 16 is finished short mix, enter the electrofloatation pond again.When former water passed electrode district, sodium-chlor was ionized and occupies clorox, and clorox carries out oxidation to the organic pollutant in the former water; The nascent oxygen that electrode district produces also carries out oxygenizement to the organic pollutant in the former water, larger molecular organics is oxidized to small organic molecule, thereby has reduced the CODcr of contamination index (chemical oxygen demand (COD)).The metal electrode ionization that is in operation simultaneously goes out a large amount of metal ion AL ^{+ 3}And Fe ^{+ 2}Metal ion rapid hydrolysis under effect of electric field generates aluminium hydroxide and ironic hydroxide flocs unit, form and piece together in the big process at this flocs unit, absorption waits effect simultaneously because charge neutrality is built bridge, the not oxidized organic pollutant of oxidized Buddhist monk is agglomerated in the flocs unit in the water, electrolytic again microbubble emerges, and reaches solid-liquid separation.Scum silica frost is scraped into stirring slag ladle 14 continuously by slag scraper 13, transports to the sludge dewatering equipment press filtration by sludge pump 17 behind the froth breaking and become mud cake in stirring slag ladle 14, can bury to fill out and can burn to eliminate secondary pollution.Clear water below the scum silica frost flows into the next stage electrode district by the passage in the air flotation pool body 11 111 and finishes above-mentioned electrochemistry materialization treating processes, is collected by clear water collection tube 112 until the last step clear water, effluxes inflow subsequent technique processing unit by clearing water pipe 18.

And the technological principle of pressure solution air-floating apparatus is absolutely different with electrofloatation.Shown in Fig. 3,4,5, the pressure solution air-floating apparatus is by air flotation pool body 21, the pressure solution release system, and slag scraper 23 stirs slag ladle 24, electrical control system 25, sludge pump 27 and raw water tubes system, and composition such as ducts valve.

Air flotation pool body 21 is by reaction zone 211, the first capture area 212, the first disengaging zone, 213, the second capture areas 214 and second disengaging zone 215, and institutes such as clear water zone 216 form.Bottom, second disengaging zone is equipped with collection clear water pipe 217 and feeds clear water zone 216.Clear water zone 216 outer being equipped with clear water pipe 26, backflow clear water pipe 221.

Raw water tubes is by line mixer 281A, 281B, and little compositions such as retort 282 and water distributor 283 that revolve, water distributor 283 is installed in air flotation pool reaction zone 211 inner bottom parts.

Molten gas release system is by clear water return line 221, molten gas reflux pump 222, and pressure air-dissolving tank 223, dissolved gas releaser 224, air compressor 225, gas holder 226 and corresponding pipeline valve are formed.

The principle of work of pressure solution system is that molten gas reflux pump 222 is extracted out clear water by backflow 221, and through pipeline input pressure dissolving 223, air compressor 225 is pressed into dissolving 223 with air through gas holder 226.Dissolving 223 operating pressure are (34.3233-37.2653) * 10 ⁴Pa.In dissolving, air dissolves reaches the state of saturation of this pressure in water, and pressure air-dissolving water is input to dissolved gas releaser 224 by the dissolved air water pipe.Dissolved gas releaser 224 is installed in the bottom of air flotation pool body 21 first capture areas 212 and second capture area 214.Pressure air-dissolving water is through machine for releasing 224, and pressure can moment be converted into mechanical energy or heat rejection is fallen, dissolved air water pressure in 0.01 second time by (34.3233-37.2653) * 10 ⁴Pa reduces to (1.9613-2.4517) * 10 ⁴Pa, be dissolved in just becomes air in the water hypersaturated state at this moment originally saturatedly, and air molecule discharges from water body and forms that to contain microbubble concentration be 10 ⁹-10 ¹⁰Individual/L, diameter is 10 ^-5-10 ^-6The outgas water of M flows out from machine for releasing and mixes with former water.

The principle of work that the pressure solution air-floating apparatus removes organic pollution materials in the former water is as follows:

After former water is dropped into flocculation agent, finish short mix, finish little flocculation reaction through little retort 282 of revolving again, form tiny wadding that naked eyes are difficult to see altogether through line mixer 281A.Drop into polymer coagulant aids (cationic polyacrylamide) again,, finish short mix, flow into air flotation pool reaction zone 211 by water distributor 283 again through line mixer 281B.

Water body is finished flocculation reaction in reaction zone 211, bear the wadding flower of 1-2mm diameter, and the organic pollutant in the former water is set in this flocs unit.Water body enters first capture area 212 again to be mixed with machine for releasing 224 effusive outgas water.Flocs unit in microbubble in the outgas water and the former water interosculates in first capture area 212, and big, finish the copolymerization catching reaction and form the gas enclosure bubble of 3-5mm diameter and hang bubble wadding flower.Most of wadding flower proportion is less than 1, most of folder, extension bubble wadding flower emerged when therefore mixed water body flowed into first disengaging zone 213, clear water flows into second capture area 214 from 213 bottoms, first disengaging zone, the wadding that does not emerge as yet use up with first disengaging zone 212 in the same copolymerization catching reaction.

Mixed water body flows into second disengaging zone 215 again, and wadding is spent all and emerged, and clear water is collected by collection clear water pipe 217 and flowed into clear water zone 216, effluxes by clearing water pipe 26.Scum silica frost on two disengaging zone waters surface exceeds the about 100-120mn of the water surface, continuously the thick scum silica frost of scum silica frost the top about 10mm of one deck is scraped froth breaking in stirring slag ladle 24 by a chain of stations belt slag scraper, be passed to the water extracter press filtration by sludge pump 27 again and become cake, landfill or burning are to eliminate secondary pollution.

Various technical feature parameters of electrofloatation device and pressure solution air-floating apparatus and investment, working cost is relatively as table one.

Table one

Number	The performance project device	Electrofloatation		Pressure solution air supporting
						1	Adapt to the pH value scope	4.5～10	Extensively, excellent	6～9.2	Wide, good
2	Adaptogen water CODcr concentration range	≤5500mg/L	Extensively, excellent	≤2500	Generally
						3	To the CODcr clearance	80-92％	Excellent	76-82％	Very
4	To the BOD5 clearance	65-75％	Very	60-70％	Generally
						5	To the SS clearance	45-55％	Difference	96-99％	Excellent
6	To chroma removal rate	80-96％	Excellent	60-80％	Generally
						7	Remove every KgCODcr working cost	1.3 unit	Expensive, poor	0.52	Cheaply, excellent
8	Remove 1000KgCODcr/d, investment	290,000 yuan	Expensive, poor	11.2 ten thousand yuan	Cheaply, excellent
						9	Work-ing life	〉=30 years	Long	≥40	Long
10	The cycle of operation	720 hours	Short	3600 hours	Long
						11	Maintenance management	It is big to change the electrode expense	Difference	Easy	Excellent
12	The microbubble concentration bubble diameter	10 8-10 9/L，10 -6M	Difference	10 9-10 10Individual/L, 10 -5M	Excellent
						13	To the organic matter removal action principle	Oxidation, reduction, flocculation	Comprehensively	Flocculation	Single, poor
14	Dispensing	Sodium-chlor	Trace	PAC and APM	In a large number
						15	Flocs unit metal ion source	Electrode ionization	Complicated	The PAC flocculation agent	Simply
16	The scum silica frost water ratio	99.2％	Difference	98％	Excellent
						17	Energy consumption efficiency	20-25％	Difference	80％	Excellent
18	The microbubble amount	Few	Difference	The spy is many	Excellent
						19	Remove KgCODcr and produce sludge quantity	0.4kg	Excellent	1.25Kg	Difference

From table one as can be known these two kinds of air supportings relative merits are respectively arranged, and be mutually this long that are short.Because it is many that electrofloatation is removed the CODcr action principle, and electrochemical oxygenizement is arranged, and the flocculation function is arranged again, and pressure solution air supporting has only a kind of flocculation function, thus electrofloatation to remove organic ability than pressure solution air supporting strong, to CODcr, BOD ₅, it is a lot of that chroma removal rate all is higher than pressure solution air supporting.Again since pressure solution air supporting to produce microbubble can the force rate electrofloatation strong more than 10 times, so electrofloatation is removed the suspended substance ability not as pressure solution air supporting.

Owing to electrofloatation power consumption extra-high-speed, facility investment is too big, makes this technology be difficult to apply again.

Why electrofloatation invests with working cost is too greatly because power consumption is too big, power consumption why be too greatly because electrofloatation to remove organic energy consumption efficiency too low.The reason that energy consumption efficiency is too low has following 2 points:

1, among the electrofloatation operation, sewage passes first step electrode, a large amount of flocs units and a spot of microbubble have been produced, not enough half flocs unit is caught by microbubble and is emerged, and most of wadding flower flows into second stage electrode district with water body, because the wadding flower is an electrolytic conductor, makes that the specific conductivity of water body is inhomogeneous, makes electric current form a large amount of rare shorts.When same water body entered back one-level electrode district again, more serious short circuit current phenomenon took place.

2, electrode in use for some time, about about 300 hours because the water body specific conductivity is inhomogeneous, cause the metal electrode discharging surface inhomogeneous, surface metal ion ionization is dissolved in the water also inhomogeneous, causes surface a large amount of local pit and boss.This easier electrolytic efficiency that causes is low, thereby forms vicious cycle.

This causes electrode often to change, and causes management miscellaneous.Domestic original electrofloatation is almost all out of service at present.Almost seldom purchase this device now, only limit to handle the processing of the processing of the processing of metal ion waste water reclamation metal and dying industrial wastewater and part dyeing waste water and contain phenol and CN ^-Deng wastewater treatment.

Electrofloatation is handled Organic pollutants concentration when 500mg/L, and electrode district progression has two-stage, and 100mg/L has just had level Four.Progression is many more, and electrical efficiency is low more.The initial operating stage electrical efficiency is higher, and operation for some time (about about 300 hours) behind efficiency just sharply descends.Average efficient drops to 20-25% by 60-70%.

" water supply and drainage " magazine first phase in 1998 the 64th page of published article " the electrochemical method progress of purification of waste water " reported the dynamic and technological improvement about the scientific research of electrofloatation over domestic and international nearly 10 years.These improve main development round electrode materials and improve.But all be limited to the research of electrofloatation technology itself.Prolong electrode life one by one doubly to two times though make.Electrical efficiency also has raising, but investment is more expensive, and working cost reduces very little.This article has to point out in conclusion P67: " electrocoagulation and electric floating with chemical condensed phase ratio, need not to invest medicine machine, and material will reduce a lot.Its defective is energy consumption problem, improves current efficiency, and reducing polarization of electrode is the key point that cuts down the consumption of energy, also be electrocoagulation from now on heavy offense to.Though electrochemical oxidation fails to be widely used in practice, people place high hopes to it.”

Have less investment though the pressure solution air-floating apparatus is handled Organic pollutants waste water, working cost is lower, and the cycle of operation is long, and is also higher to the clearance of CODcr, has the reason of following three aspects to make it to apply also and is restricted:

1, the product sludge quantity is bigger, and the investment of eliminating secondary pollution is big, and working cost is corresponding also higher.

2, when the CODcr of former water concentration is higher than a certain numerical value, dispensing is nonlinear relationship with removal CODcr amount, makes it to former water CODcr concentration a subject range be arranged.General CODcr＜2000mg/L surpasses this scope, and the dosage of removing the CODcr of unit sharply increases, and producing sludge quantity also sharply increases, and makes working cost high as can't to bear.

3, to having little effect that some bigger industrial sewage of some industrial sewages, particularly chroma pollution is handled, as dying industrial wastewater, dyeing waste water, leather waste water, medicine and agricultural chemicals waste water etc.

The CODcr of most industrial Organic pollutants waste water all belongs to middle and high concentration, and has bigger dyeing mostly.If not than electrofloatation and the more suitable better technique device of pressure solution air supporting, if there is not reduced investment, working cost is low, produces the few sophisticated new practical technique of sludge quantity, then certainly will and take up an area of the main technique unit that great biochemical processing process is used as sewage disposal by investment.This is not suitable for China as severe situation of the environmental protection of developing country and financial resources situation.

Summary of the invention

In order to invent a kind of new materialization treatment technology; In order to keep electrofloatation to handle the ability of Organic pollutants waste water, cut down the consumption of energy again and invest; In order to improve the ability that Organic pollutants waste water is handled in pressure solution air supporting, and don't increase energy consumption and reduce the medicine consumption, do not increase too big investment; During this new materialization treatment technology can be competent at separately, lower concentration organic contamination Industrial Wastewater Treatment; Also can bear the main technique processing unit for the middle and high concentration wastewater treatment, be used as assisting and need only invest simple biochemical treatment unit on a small quantity.For this reason, the invention discloses a kind of novel air-floating apparatus-comprehensive air floating system for pressure dissolution electrolysis.

These complexes by air flotation pool body 31, pressure solution release system, slag scraper 33, stir slag ladle 34 electrical control systems 35, electrolysis electrode system, pharmacy administration system, equipment such as water inlet piping, sludge pump 39 and ducts valve cable are formed.

This technology has pressure solution air supporting and electrofloatation technology strong point concurrently, has remedied the weak point of the two simultaneously again.

Realize that this purpose mainly is the electrolysis electrode that not stripping of speciality water in work-ing life metal ion is installed in the pressure solution air flotation pool, in the organic contamination trade effluent, add simultaneously inorganic flocculating agent aluminium chlorohydroxide or composite polymeric aluminium chlorohydroxide, also add a spot of ferrous sulfate and micro-sodium-chlor, to replace the aluminum ion and the ferrous ion of the stripping of electrofloatation metal electrode, imitate the electrochemistry and the electric materialization principle of electrofloatation fully, make in the former water dissolving and the organism of half dissolved state and the various medicines of input in electric field, finish electrochemical redox reaction and electric materialization flocculation reaction together, reach the purpose of high-level efficiency place except that CODcr.

The technological principle of comprehensive air floating system for pressure dissolution electrolysis of the present invention is shown in Fig. 6,7,8,9.

Be elaborated below in conjunction with embodiment.

Description of drawings

Fig. 1: electrofloatation technological principle vertical planning drawing;

Fig. 2: electrofloatation technological principle orthographic plan;

Fig. 3: pressure solution air-float technology principle vertical planning drawing;

Fig. 4: pressure solution air-float technology principle orthographic plan;

Fig. 5: pressure solution air supporting pressure solution release system artwork;

Fig. 6: the comprehensive air supporting complexes of pressure solution electrolysis technological principle;

Fig. 7: the comprehensive air supporting complexes of pressure solution electrolysis technological principle vertical planning drawing;

Fig. 8: pressure solution release system and administration system artwork in the comprehensive air supporting complexes of pressure solution electrolysis;

Fig. 9: electrolytic system schematic diagram in the comprehensive air supporting complexes of pressure solution electrolysis;

Embodiment

These comprehensive air floating complexes are by air flotation pool body 31, the pressure solution release system, and slag scraper 33 stirs slag ladle 34, electrical control system 35, the electrolysis electrode system, the pharmacy administration system, the water inlet piping, equipment such as sludge pump 39 and ducts valve cable are formed.

Air flotation pool body 31 is by reaction zone 311, the first electrolysis capture areas 312, the first solid-liquid displacement zone 313, the second electrolysis capture areas 314, the second solid-liquid displacement zone 315, clear water zone 316 compositions such as grade, more than each district have the water proof plate washer to separate, also be provided with plate washer in the reaction zone.

The return line 321 that the pressure solution release system is communicated with clear water zone 316 by an end, the reflux pump 322 that joins with return line 321 the other ends, the pressure air-dissolving tank 323 that joins with reflux pump 322 and dissolved gas releaser 324, gas holder 325 respectively, the air compressor machine 326 that joins with gas holder 325 and corresponding pipeline, valve are formed.Return line 321 is installed on the air flotation pool clear water zone 316 and interlinks with it.Dissolved gas releaser 324 is installed in the bottom of the air flotation pool first electrolysis capture area 312 and the second electrolysis capture area 314.

Altitude valve 319 is installed in the clear water zone 316.315 bottoms, second disengaging zone are equipped with clear water pipe 317.

Slag scraper 33 is installed on the horizontal plane of air flotation pool body 31, stirs slag ladle 34 and links to each other with air flotation pool body 31 by slag-guiding plate 314.Slag scraper 33 is the continuous slag scrapers of chain-belt type.

The electrolysis electrode system is by voltate regulator 361, transformer 362, rectifier 363, compositions such as electrolysis electrode group 364 and cable electricity row 365 and interconnective cable.Electrolysis electrode group pole plate is made by graphite material.Electrolysis electrode group 364 is connected with the output terminal of rectifier 363, the input side of this transformer 362 and the outgoing side of voltate regulator 361 join the input terminus of rectifier 363 with the outgoing side of transformer 362 is continuous, and the input side of voltate regulator 361 and power supply join and electrolysis electrode group 364 is obtained and working power.

Machine for releasing 324 output cables 327 link to each other with voltate regulator 361.

Line mixer 382 that the water inlet piping is joined with water inlet pipe 381 by an end and links to each other with described tube stub 374 and the water distributor 383 that is connected these line mixer 382 the other ends are formed.

Water distributor 383 is installed and is extended in air supporting reaction zone 311 bottoms, and all the other are installed in outside the air flotation pool.

Electrolysis electricity level group 364 is installed in the first electrolysis capture area 312 of air flotation pool body 31 and the top of the second electrolysis capture area 314.

The pharmacy administration system is thrown A Teat pipette 372 by A drug dissolving tank 317, and A medicine gauge 373 is thrown A pencil first joint 374 and thrown A pencil second joint 375; M drug dissolving tank 376 is thrown M Teat pipette 377, and M medicine gauge 378 is thrown M pencil joint 379, and corresponding pipeline valve etc. is formed.

Throwing A pencil first joint 374 is installed on the water intake end of line mixer 382, throw A medicine second joint 375 and be installed on the suction medicine hole of the machine for releasing 324 in the second electrolysis capture area 314, A indication medicament is the mixing solutions of aluminium chlorohydroxide, sodium-chlor, ferrous sulfate.

Throw M pencil joint 379 and be installed on the suction medicine hole of the machine for releasing 324 in the first electrolysis capture area 312, M indication medicament is a polyacrylamide solution.

Electrical control system 35 is responsible for pharmacy administration system 37, and slag scraper 33 stirs slag ladle 34, reflux pump 322, and air compressor machine 326, sludge pump 39 grades are carried out control.

The electrical control system that adopts in this comprehensive air floating system for pressure dissolution electrolysis, cable, electricity row's appliance material device all is national standard general parts; The water pump that adopts, motor, step-down gear, air compressor machine etc. also are the national standard general-purpose equipment; Gas-holder, dissolving, drug dissolving tank, slag scraper, to stir the slag machine also be requirement according to national plumbing design manual (1-2 volume) standard; Equipment such as pipeline, valve, tube stub also are to adopt the national standard general part, and wherein dissolved gas releaser 324 can preferably adopt the Chinese patent application publication number to be power generating type dissolved gas releaser that CN1041712A provided.

The principle of work process of comprehensive air floating system for pressure dissolution electrolysis is divided into 3 assisting workflows and a main technical process, and these four flow processs are worked simultaneously, in whole process, have filled with water in the air flotation pool, and electrolysis electrode 364 is submerged under water.

First assisting workflows are pharmacy dispensing flow processs: its process is as follows: in molten A medicinal cupping with aluminium chlorohydroxide (Al ₃(OH) _nCl _6-N) m (n, m are natural number for n=1-5, m=1-12) and solid sodium chloride, also have solid sulphuric acid ferrous in 1000: the ratio of 2-10: 1-5, being dissolved in water is Al ₂O ₃The inorganic flocculating agent A soup of content 2-3%, pump by throwing A Teat pipette 372, through A medicine gauge 373 and corresponding pipeline valve with throw A pencil first joint 374 and throw in the water intake end that A pencil second joint 375 is added to line mixer 382 and in the machine for releasing 324 in the second electrolysis capture area 314.

In molten M medicinal cupping 376, polyacrylamide is dissolved in water into solid content and is 0.02% dilute solution, pump by throwing M Teat pipette 377, through M medicine gauge 378, through the corresponding pipeline valve, in the machine for releasing 324 that throwing M pencil joint 379 is added in the first electrolysis capture area 312.

Second assisting workflows is pressure solution release flow, and its process is as follows: molten gas reflux pump 322 by return line 321 and respective valves pipeline with the treated clear water suction in the clear water zone 316 and press in the input pressure dissolving 323; On the other hand, air compressor machine 326 by gas holder 325 and corresponding pipeline valve with in the pressurized air input pressure dissolving 323.The operating pressure of dissolving 322 is (34.3233-37.2653) * 10 ⁴Pa.Air saturation value soluble in water under corresponding this operating pressure, the approaching formation pressure air-dissolving water soluble in water saturatedly of pressurized air.Pressure air-dissolving water flow into the dissolved gas releaser 324 that is installed in the air flotation pool first electrolysis capture area 312 and the second electrolysis capture area 314 by corresponding pipeline valve again.When dissolved gas releaser adopts the power generating type dissolved gas releaser, pressure air-dissolving water promotes the runner high speed rotating in the machine for releasing 324, pressure energy, kinetic energy, the moment of pressure air-dissolving water are converted into mechanical energy, convert thereof into electric energy by the generator in the machine for releasing 324 again, with 200-240V, the electric current of 40-50HZ is defeated by voltate regulator 361 by output cable 327.Reduce to (1.9613-2.4517) * 10 from machine for releasing 324 effusive dissolved air water pressure ⁴Pa, original air soluble in water is released into out from water with regard to having become hypersaturated state, and formation contains superfine, and (diameter is 10 ^-5M) dense (concentration is 10 to superelevation ⁹-10 ¹⁰Individual/L) the outgas water of microbubble.

Owing to throw to throw in the machine for releasing 324 of M Teat pipette in the first electrolysis capture area 312 M polymer coagulant aids arranged, therefore the dense microbubble of outgas water superelevation is herein carrying M medicine molecule, carries out the motion of thorough mixing mass transfer by high-gradient concentration diffusion and the pending former water that enters this district.

Owing to throw in the machine for releasing 324 of A Teat pipette in the second electrolysis capture area 314 and added inorganic flocculating agent A medicine, therefore the dense microbubble of outgas water superelevation is herein carrying A medicine molecule, carries out the motion of thorough mixing mass transfer by high-gradient concentration diffusion and the water body of further handling for the treatment of that enters this district.

This supporting process also is continuously to carry out.

The 3rd assisting workflows are electrofloatation flow processs, and its detailed process is as follows:

Voltate regulator 361, transformer 362 become low voltage into big electric current, by rectifier 363 alternating-current are become direct current again, again by the electrode group in the cable electricity row's input air flotation pool first electrolysis capture area 312 and the second electrolysis capture area 314.Electrode group positive-negative electrode plate is all made with graphite material.The about 20-40mm in gap between the battery lead plate, former water pass total time about palpus 3-8min of two electrode groups.Voltage between two battery lead plates is about the 4-8 volt.

After the energising of electrolysis electrode group, the positive electrode pole plate is accepted electronics continuously, a large amount of generation nascent oxygen atoms, and be reduced into oxygen molecule formation superfine bubble cloud rapidly, nascent oxygen has extremely strong oxygenizement to solvability in the former water or half dissolved organic matter in this course.The polarity organic macromolecule is oxidized to nonpolar organic molecule.The wetting ability organic molecule is oxidized to the hydrophobicity organic molecule, makes it easy to the materialization flocculation and remove.

On the other hand, negative electrode plate constantly discharges electronics, discharges hydrogen atom, and moment is oxidized to hydrogen molecule again and forms the superfine bubble cloud.Ferrous ion in the electrode district water body under this electric field action, carries out reductive action to the dyeing group of organic molecule in the water, and it is discolored, and spontaneous being oxidized to+3 valency iron ions are hydrolyzed to the ironic hydroxide flocs unit at last simultaneously.This flocs unit produces throwing out again to organism.

Sodium-chlor in the electrode district water body is electrolyzed to produce clorox, and clorox is with the organic molecule oxidation.

Aluminium chlorohydroxide in the electrode district water is under this effect of electric field, also hydrolysis generates a large amount of aluminium hydroxide wadding flowers rapidly, these wadding flowers form thread network shape wadding flower under the effect of polymer coagulant aids, this wadding flower shrinks to its center, in this materializing procedure, the organism of most half dissolved state, complete hydrophobicity (nonpolar) organic molecule in the dissolved organic matter and local hydrophobicity (local nonpolar) organic molecule, and the net that all shunk to wadding flower center by this thread network shape wadding flower of the tiny flocs unit of ironic hydroxide (also solidifying has organism) is caught volume and is swept and be set in the flocs unit.The polarity of most of macromolecule (wetting ability) organism is also flocculated in wadding is spent in this course; In this course, the superfine bubble major part that the ionization of electrode group discharges is also clamped in wadding is spent, and the microbubble that machine for releasing 324 discharges is attached to wadding and spends the surface.Make flocs unit proportion much smaller than 1, be convenient to follow-up solid-liquid separation and sludge dewatering.

Above-mentioned this process is exactly electrolytics process and electric materialization flocculation process.Two oxidising processs are wherein arranged, a reduction process, two flocculation processes also have a microbubble and flocs unit bonded process.Above-mentioned these processes are carried out simultaneously, the about 2-4min of time that continues in each electrolysis electrode group 364.In case air-floating apparatus starts, electrolysis electrode group 364 is even the reforwarding row.This is the principle of work of the 3rd assisting workflows.

The 4th workflow that is to say that the main technique flow process is as follows: former water enters total system by water inlet pipe 381, after having added inorganic flocculating agent A medicine, even through line mixer 382 short mix, in water distributor 383 enters air flotation pool reaction zone 311, finish little flocculation reaction, bear aluminium hydroxide subparticle (the about 0.01-0.05mm of diameter).Water body enters the middle and lower part and the machine for releasing 324 effusive outgas water uniform mixing of the first electrolysis capture area 312 then, pass electrolysis electrode group 364 together, finish electrolytics reaction process and electric materialization flocculation reaction process, bearing diameter is the folder extension microbubble flocs unit of 2-5mm.Majority of organic pollutants is wrapped in the flocs unit, enters first disengaging zone 313 with current.

Flocs unit is the 313 formation scum silica frost that emerge in the disengaging zone, clear water flows into the second electrolysis capture area 314 by 313 bottom, with machine for releasing 324 effusive outgas water uniform mixing, contain inorganic floss A medicine in this outgas water, water body is when passing electrolysis electrode group 364, electrolytics reaction process and electric materialization flocculation process take place once more, and the organism of still not oxidized reduction reaction in the water body and flocculation removal is further thoroughly removed.The purpose of why removing at twice is can cause the flocs unit Tai Mitai between the electrolysis electrode crowded for fear of the one-level removal, and at that rate, the electric conductivity in the water body causes the electric current rare short with inhomogeneous, can cause the electric current waste.

Behind the second electrolysis capture area 314, water body enters second disengaging zone 315, and the flocs unit formation scum silica frost that emerges, clear water are collected by second disengaging zone, 315 bottom collection clear water pipes 317 and flowed into clear water zones 316.The sub-fraction clear water is back to pressure solution release system 32 by return line 321 again and keeps the second assisting workflows non-stop run.

In operational process, the air flotation pool water level is by regulating gate valve 319 controls in the clear water zone.

Most of clear water effluxes or enters the subsequent technique section by clearing water pipe 318.

Scum silica frost is higher than the about 100-150mm of the water surface on air flotation pool body 31 horizontal planes, by chain-belt type slag scraper 39 scrape in slag-guiding plate 341 again landing in stirring slag ladle 34.Behind the part froth breaking, press the input sludge dewatering equipment to be dehydrated into cake, thereby eliminate secondary pollution by sludge pump 39.

Because enough microbubbles about 100-150mm height that makes it to emerge is all arranged inside and outside the flocs unit of emersion, and scum silica frost has formed three-phase sponge shape liquid.Water molecules in the scum silica frost along the continuous landing of three intersection interfaces in water, the water ratio of scum silica frost surface layer is more and more lower, slag scraper only strike off at every turn the about 10mm in scum silica frost surface thick than dry dross, after the upper layer scum silica frost was struck off, the whole continuation of scum layer raised, and upper layer is struck off again, scrape the scum silica frost water ratio that stirs in the slag ladle 34 like this and have only 96.5% to 97%, sludge quantity reduces significantly like this, and follow-up device for dehydrating sladge waste will be invested little, and working cost is low.

The main technical details of comprehensive air floating system for pressure dissolution electrolysis of the present invention and investment, working cost parameter such as table two.

Can know from table two, this comprehensive air floating system for pressure dissolution electrolysis combines electrofloatation and the pneumatically supported superior technical feature of pressure solution really, and overcome deficiency separately, and some performance also is higher than both, also reduced by 20% such as working cost than pressure solution air supporting, the level that the organic substance clearance is kept electrofloatation, working cost also descends, is what reason this? this is according to electrolysis law: electrisity consumption is directly proportional with electrolysis leachable quality, insoluble any material that goes out because electrolysis electrode group 364 is in operation, therefore this electrolysis process current consumption is minimum.If adopt the power generating type dissolved gas releaser, its electric energy that sends also can.The electrochemical reaction that takes place in this electrolysis electrode group 364 is the same with the reaction of generation in the electrofloatation electrode group 12 with the materialization flocculation reaction simultaneously, and will not save a large amount of flocculation agents and coagulant aids than the simple materialization flocculation that pressure solution air supporting has electrochemical reaction to participate in.

Though electrofloatation is than proven technique, though pressure solution air supporting is proven technique very, the present invention compares with the above two clear and definite novelty and creativeness.Because the investment of this invention is only high by 25% than pressure solution air supporting, still low by 50% than electrofloatation, and also work-ing life and the cycle of operation are all long than both, so the present invention has bigger Practical Performance than both.

Table two

Sequence number	The device performance project	Pressure solution electrofloatation device provided by the invention		Remarks
					1	Adapt to the pH value scope	5.5～10	Excellent	The boundary is between existing two air supportings
2	Adaptogen water CODcr concentration range	≤7500mg/L	Excellent
					3	To the CODcr clearance	78-92％	Excellent	Identical with electrofloatation
4	To the BOD5 clearance	65-75％	Excellent	Identical with electrofloatation
					5	To the SS clearance	97-99.5％	Excellent	Identical with pressure solution air supporting
6	To chroma removal rate	80-96％	Excellent	Identical with electrofloatation
					7	Remove the KgCODcr working cost	0.42 unit	Excellent	All lower than both
8	Remove 1000KgCODcr/D, investment	150,000 yuan	Excellent	A little more than pressure solution air supporting
					9	Work-ing life	〉=40 years	Excellent	Identical with pressure solution air supporting
10	The cycle of operation	7200 hours	Excellent	Than both equal height
					11	Maintenance management	Easy	Excellent	Identical with pressure solution air supporting
12	The scum silica frost water ratio	96.5-97.5％	Excellent	All more excellent than both
					13	Energy consumption efficiency	80-85％	Excellent	All more excellent than both
14	Remove KgCODcr and produce mud	0.65Kg	Excellent	The boundary is between the two
					15	To the organic matter removal action principle	Electrochemistry, electric thing are learned	Excellent	Identical with electrofloatation

Comprehensive air floating system for pressure dissolution electrolysis of the present invention and electrofloatation and pressure solution air supporting essential distinction are relatively as table three.

The device characteristic characteristic	The I electrofloatation	II pressure solution air supporting	The III comprehensive air floating	Remarks
					Whether the air flotation pool body is arranged	(greatly) arranged	(greatly) arranged	(little) arranged	Slightly have any different
Whether slag-treating machine is arranged	Not essential	Have	Have	Indistinction
					Whether electrode and system are arranged	Have	Do not have	Have	Difference is little
Electrode materials	Metal		Nonmetal	Substantive difference 1
					Electrode life	Short		Speciality	Substantive difference 2
The electrode power consumption	Greatly		Little	Substantive difference 3
					Whether the pressure solution release system is arranged	Do not have	Have	Have	Slightly have any different
Pressure solution release system power		Greatly	Little
					Throw flocculation agent	Do not have	(greatly) arranged	(little) arranged	Substantive difference 4
Throw NaCl not	Have	Do not have	Have
					The throwing ferrous ion is not	Do not have	Do not have	Have	Substantive difference 5
Throw the polymer coagulant aids not	Do not have	(many) are arranged	(trace) arranged	Substantive difference 6
					Whether air flotation pool is with is stirred slag ladle	Have	Have	Have	Indistinction
Oxidizing reaction, reduction reaction	Have	Do not have	Have	Substantive difference 7
					The reaction of materialization wadding		Have	Have	Substantive difference 8
Electricity materialization flocculation reaction	Have		Have	Substantive difference 9
					The reaction of flocs unit microbubble	A little less than	By force	Stronger	Substantive difference 10

The actual engineering experiment design example of comprehensive air floating system for pressure dissolution electrolysis is as follows:

Day is handled 35000M ³Papermaking midcourse wastewater, Inlet and outlet water sees Table four.

Table four

Other parameter is as follows:

The long 12M of air flotation pool, wide 4M, depth of water 1.9M.

Scum silica frost water ratio: 97%.

Every removal 1KgCODcr produces mud (over dry): 0.6Kg.

Every removal 1KgCODcr power consumption 0.06 degree.

Every removal 1KgCODcr consumption inorganic flocculating agent 0.4Kg (contains Al ₂O ₃Content is 9% liquid preparation).

Every removal 1KgCODcr consumption polymer coagulant aids 0.02Kg (be with polypropylene content 2% soup agent).

Every removal 1KgCODcr consumption NaCl is about 0.0002Kg.

Every removal 1KgCODcr consumption ferrous sulfate 0.0001Kg.

Total installation of generating capacity 16KW, air compressor machine 3KW wherein, reflux pump 11KW, slag scraper 1.5KW stirs slag ladle 1.5KW, in addition administration system installation 3KW.

Two generators or dissolved gas releaser be 4KW altogether, the electricity consumption of the power supply utmost point.

Electrode voltage 8.5V, the total Faradaic current 290A of two utmost point electrodes.

Device, equipment such as the electrical control system that adopts in this experimental installation, cable, electric row, water pump, motor, step-down gear, air compressor machine, pipeline, valve, tube stub are the national standard general part.Dissolved gas releaser adopts power generating type dissolved gas releaser, gas-holder, dissolving, slag scraper and stirs slag ladle etc. is with reference to the code requirement in the national plumbing design manual (1-2 volume).This experimental installation is removed CODcr9100kg every day altogether.

Being converted to processing water running expense per ton is 0.82 yuan (electricity calculates with 0.9 yuan/degree, and aluminium chlorohydroxide calculates with 0.7 yuan/kg, does not wherein count artificial and depreciation).

In sum.This comprehensive air floating system for pressure dissolution electrolysis have to organic polluting water handle subject range special wide, clearance is high, stable, life-span length, cycle length, simple and convenient management, reduced investment, occupation of land less, comprehensive feature such as low, the practicality extra-heavy of working cost.This invention can extensively adapt among the sub various technique for treating industrial wastewater, in the handling technology of water supply that also can be adapted to remove algae turbidity removal sterilization in the river, lake.

Claims (6)

1, a kind of comprehensive air floating system for pressure dissolution electrolysis, it is characterized in that: these complexes are by air flotation pool body (31), the pressure solution release system, slag scraper (33), stir slag ladle (34), electrical control system (35), the electrolysis electrode system, the pharmacy administration system, the water inlet piping, sludge pump (39) and ducts valve cable equipment are formed, the top of air flotation pool body (31) the first electrolysis capture areas (312) and the second electrolysis capture area (314) is equipped with electrolysis electrode group (364), the bottom is equipped with dissolved gas releaser (324), dissolved gas releaser (324) is connected with pressure air-dissolving tank (323) by pipeline valve, electrolysis electrode group (364) is connected with the output terminal of rectifier (363) by cable electricity row (365), the outgoing side of the same transformer of input terminus (362) of rectifier (363) links to each other, the input side of this transformer (362) links to each other with the outgoing side of voltate regulator (361), and the input side of voltate regulator (361) links to each other with power supply and makes electrolysis electrode group (364) obtain working power thus.

2, comprehensive air floating system for pressure dissolution electrolysis according to claim 1 is characterized in that:

(1) air flotation pool body (31) is by reaction zone (311), the first electrolysis capture area (312), and first solid-liquid displacement zone (313), the second electrolysis capture area (314), second solid-liquid displacement zone (315) and clear water zone (316) are formed; More than each district have the water proof plate washer to separate, also be provided with plate washer in the reaction zone;

(2) return line (321) that is communicated with clear water zone (316) by an end of described pressure solution release system, the reflux pump (322) that joins with return line (321) the other end, the pressure air-dissolving tank (323) that joins with reflux pump (322) and dissolved gas releaser (324), gas holder (325) respectively, and the air compressor machine (326) that joins of gas holder (325) and corresponding pipeline, valve form;

(3) the pharmacy administration system is by A drug dissolving tank (371), throw A Teat pipette (372), A medicine gauge (373), throw A pencil first joint (374) and throw A pencil second joint (375), M drug dissolving tank (376), throw M Teat pipette (377), M medicine gauge (378) is thrown M pencil joint (379) and corresponding pipeline valve is formed; A indication medicament is the mixing solutions of aluminium chlorohydroxide, sodium-chlor, ferrous sulfate, and M indication medicament is a polyacrylamide solution;

(4) described water inlet piping is joined with water inlet pipe (381) by an end and the line mixer (382) that links to each other with described tube stub (374) and the water distributor (383) that is connected this line mixer (382) the other end are formed;

(5) second solid-liquid displacement zone of air flotation pool body (31) bottom is equipped with collection clear water pipe (317), leads to clear water zone (316); The return line of pressure solution release system (321) is installed in clear water zone (316) and is attached thereto logical outward; Clear water pipe (318) be installed in clear water zone (316) outer be attached thereto logical; The bottom that the water distributor (383) of water inlet piping is installed the reaction zone (311) that extends to air flotation pool body (31);

(6) slag scraper (33) is the continuous slag scraper of chain-belt type, is installed on the horizontal plane of air flotation pool body (31); Stirring slag ladle (34) links to each other with air flotation pool body (31) by slag-guiding plate (341);

(7) throwing A pencil first joint (374) is installed on the water intake end of line mixer (382); Throwing A medicine second joint (375) is installed on the suction medicine hole of the dissolved gas releaser (324) in the second electrolysis capture area (314); Throwing M pencil joint (379) is installed on the suction medicine hole of the dissolved gas releaser (324) in the first electrolysis capture area (312); A indication medicament is the mixing solutions of aluminium chlorohydroxide, sodium-chlor, ferrous sulfate, and M indication medicament is a polyacrylamide solution;

3, comprehensive air floating system for pressure dissolution electrolysis according to claim 2, it is characterized in that: described dissolved gas releaser (324) is the power generating type dissolved gas releaser, and this dissolved gas releaser is connected with the voltate regulator (361) of electrolysis electrode system by output cable (327).

4, comprehensive air floating system for pressure dissolution electrolysis according to claim 2 is characterized in that: slag scraper (33) only strike off scum silica frost surface 10mm thick than dry dross.

5, according to claim 2,3 or 4 described comprehensive air floating system for pressure dissolution electrolysis, it is characterized in that: in A drug dissolving tank (371), the sodium-chlor and the ferrous sulfate of trace is dissolved in flocculation agent aluminium chlorohydroxide or the complex polyaluminium chloride solution; Its ratio is an aluminium chlorohydroxide 1000: sodium-chlor 2-10: ferrous sulfate 1-5 is dissolved in water into Al ₂O ₃Content is the inorganic flocculating agent A medicine of 2-3%, pump by throwing A Teat pipette (372), through A medicine gauge (373) and corresponding pipeline valve, throwing A pencil first joint (374) and throwing A pencil second joint (375) are added to respectively in the dissolved gas releaser (324) that water intake end is interior and the second electrolysis capture area (314) is interior of line mixer (382).

6, according to claim 2,3 or 4 described comprehensive air floating system for pressure dissolution electrolysis, it is characterized in that: the rare soup of preparation polyacrylamide coagulant aids in molten M medicinal cupping (376), pump by throwing M Teat pipette (377), through M medicine gauge (378), through the corresponding pipeline valve, throw M pencil joint (379) and be added in the interior dissolved gas releaser (324) of the first electrolysis capture area (312).

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