CN1648077A - Process and its device for biologically removing heavy metal in mud - Google Patents
Process and its device for biologically removing heavy metal in mud Download PDFInfo
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- CN1648077A CN1648077A CNA200410014801XA CN200410014801A CN1648077A CN 1648077 A CN1648077 A CN 1648077A CN A200410014801X A CNA200410014801X A CN A200410014801XA CN 200410014801 A CN200410014801 A CN 200410014801A CN 1648077 A CN1648077 A CN 1648077A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/20—Sludge processing
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/30—Wastewater or sewage treatment systems using renewable energies
- Y02W10/37—Wastewater or sewage treatment systems using renewable energies using solar energy
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- Treatment Of Sludge (AREA)
Abstract
The apparatus for removing heavy metal in mud biologically includes mud regulating pond, biological mud heavy metal eluviating pond, acidified mud precipitating pond, collecting pond, heavy metal recovering pond and other facilitates, and aerator, stirrer, dewatering machine, heater, automatic nutrient feeder, etc. By means of reductive sulfur, ferrous and other energy source matters inside or outside the mud, and aerobic and stirring condition, the acidophilic thiobacillus reduces mud medium pH to below 2 and dissolves heavy metal from mud in 100 %. Through mud dewatering, liquid is separated from solid, and the heavy metal in separated liquid is recovered in alkali deposition process. The technological process and apparatus of the present invention can eliminate heavy metal in mud by over 95 % to make mud become harmless resource.
Description
One, technical field
The present invention relates to the environmental protection field, be applicable to removing of heavy metal in municipal sludge and the industrial sludge, for example in the electroplating sludge that produces of the leather-making mud that produces of leather-making enterprises sewage work and electroplating enterprise sewage work heavy metal remove processing etc.
Two, technical background
At present seat surplus the municipal sewage plant 500 of running has been built up in the whole nation, the nearly billion cubic meter of ability of disposing of sewage day, and wastewater treatment rate has reached 25%.According to the prediction of China's water surrounding management objectives and the Ministry of Construction, the wastewater treatment rate of going into pipe network to China city in 2005 should reach 47%, 2015 year and reach 70%, continues to build energetically, extend the inexorable trend that sewage work becomes social development.Yet with the sewage disposal cause extremely incompatible be, no matter at our province still in the whole nation, concentrated in the sewage mud of 85% above objectionable impurities (especially heavy metal) and but failed properly to be disposed always.These organic solid castoff majorities are thrown aside around the sewage work arbitrarily or simple heap is filled out or by near peasant's abuse on farmland, some in addition be poured onto near the river.The disposal lack of standardization of mud has become new environomental pollution source in China's soil and the water surrounding, partial offset the effect of sewage work's environment purification, seriously having restricted the sewage disposal cause develops in a healthy way, because the mud generation is very big, stable, environmental safety of none and cost-effective outlet again, therefore, the mud problem of outlet also just becomes a difficult problem that makes sewage work deeply worry about always.Though the utilization of municipal sludge soil is one of current disposal approach of extremely paying attention in the world, yet the existence of heavy metal in the mud has limited the implementation that the mud soil utilizes to a great extent.With the exception of this, also has the huge all types of industries of quantity (dirt) water treatment station (field) that gives up in China, the mud that useless (dirt) water treatment station (field) of the industry of quite a few produces contains the toxic heavy metal of higher amount, even part mud can belong to the Hazardous wastes category, and these mud become the important hidden danger of environment.
For example, according to the typical sludge from wastewater treatment plant argillaceous of China is investigated, Cu in most municipal sludges, Zn, Pb, Cr, heavy metal content such as Ni can reach hundreds of to thousands of mg/kg, Cd, and Hg, (refer to Hg, Cd content surpasses 5mg/kg to overrun metal content persons such as As; As surpasses 20mg/kg) also not rare.Some industrial sludges, higher as heavy metal content in leather-making mud, the electroplating sludge, can reach tens thousand of to hundreds thousand of mg/kg.Heavy metal is all handled less than good way for a long time in these mud.Be to adopt alkaline stabilization method (promptly in mud, adding basic materials such as flyash, cement flue Dust or lime) that heavy metal in the mud is carried out Passivation Treatment at the most, make heavy metal become low activity by high reactivity, and reduce its murder by poisoning, but the total metals change does not change.These mud enter in the environment, and the potential hazard of heavy metal still exists.
The mud that produces with typical certain leather-making enterprises sewage work is example, wherein contain a large amount of organism (up to about 45%), also contain the available nutritive substances of plant such as abundant N, P, K, but leather-making mud not only is difficult to dehydration especially, and because its special stench, more seriously wherein contain a large amount of heavy metal chromiums, the content of chromium is up to 10000-40000mg/kg.Though chromium mainly exists with the relatively low trivalent chromium form of toxicity in the mud, it also can change into sexavalent chrome in environment.Sexavalent chrome has bigger toxicity, can make that the people is carcinogenic, teratogenesis tire, mutagenesis, all can produce bigger harm to skin, respiratory system and Digestive tract, also influences the metabolism of living organisms such as plant.The concentration of the total chromium of regulation should be less than 600mg/kg (to the soil of pH≤6.5) or 1000mg/kg (to the soil of pH＞6.5) in the mud agricultural standards of China.At present in China, leather-making enterprises is to the disposal approach that does not still have standard of the mud of its generation, and majority is after adopting drying bed nature mummification or mechanical dehydration, mud is transported to the elsewhere heap fills out, and small part is used for brickmaking.Because which kind of disposal options no matter the existence of heavy metal adopt, and has the environmental pollution risk.
For removing heavy metal in the mud, Macchi etc. (1998) and Panswad (1995) just attempted adopting mineral acid such as sulfuric acid extraction to remove the scheme of leather-making mud chromium, with sulfuric acid with the pH of leather-making mud from 8 left and right adjusting to 1, chromium is removed a large amount of strippings or reclaimed by dehydration then in the mud at this moment.Wozniak and Wong (1982), Jenkins etc. (1981), Wu etc. (1998) once utilized acid or complexing agent such as H
2SO
4, HNO
3, processing city municipal sludges such as HCl, EDTA are reducing or are removing in the mud and also obtain better effects aspect the heavy metal with the chemical process of heavy metal in dissolving and the lixiviate mud.Yet because of mud has huge resiliency, particularly some industrial sludges such as leather-making mud are very big with mineral acid adjusting acid consumption, the processing costs height; Directly add mineral acid and also can cause a large amount of toxic gas hydrogen sulfide to leak, operate dangerous.These shortcomings make the chemical detoxication method of mud there is no actual application value.
If the biological detoxification technology that heavy metal in the mud is removed in the effect that utilizes microbial host acidophilia thiobacillus (also claiming " bioleaching technology "), because of reaction temperature and, environmental safety, advantage such as with low cost enjoy people's attention.The nineties in last century, external some investigators, mainly be Canadian Taygi professor leader's seminar, the microbial detoxification technology of municipal sludge is removed heavy metal has carried out some researchs.Its ultimate principle is, adding under energy substance (mainly be ferrous and reducible sulfur etc.) and the logical oxygen condition, utilize the biological oxidation of thiobacillus and the low pH environment of generation thereof to make the heavy metal stripping that exists with the insoluble form enter water, remove by solid-liquid separation again, sulfide changes vitriol into by oxygenizement, and heavy metal removing rate can reach 85%-99% in the mud.This seminar also once isolated two strains thiobacillus bacterial strain (thiobacillus ferrooxidant LX5 efficiently from municipal sludge and leather-making mud, preserving number CGMCC NO.0727 and thiobacillus thiooxidans TS6, preserving number CGMCC NO.0759), but and find to utilize heavy metal in this bacterium effective elimination mud.And successively applied for 2 national inventing patents (thiobacillus ferrooxidant and remove the method for sludge heavy-metal, application numbers: 02112924.X in April, 2002 and July; The biological eliminating method of chromium in thiobacillus thiooxidans and the leather-making mud, application number: 02137921.1).
Yet research that heavy metal biological is deviate from the relevant mud and relevant patent thereof, only be to have reported its method, the result that obtains is by the mode of shaking bottle or obtains in very little reactor, and do not relate to the research of the considerable nucleus equipment of actual engineering and facility and concrete technology.Therefore, institute's parameter that obtains and breadboard method are difficult to be applied to actual engineering.The present invention under above-mentioned background, has invented heavy metal microorganism removing process and relevant device in the mud that can be applied to actual engineering just.
Three, summary of the invention
The present invention relates to heavy metal biological removes in the mud main basic technology and equipment, as shown in Figure 1, consist of the following components:
Primary sludge in mud equalizing tank 1, be transported in the bioleaching pond 3 through sludge pump 2 and stir, and carry out oxygenation by aerating system 9, inoculation has acidophilia thiobacillus bacterial strain (as thiobacillus ferrooxidant LX5 and thiobacillus thiooxidans TS6) in the bioleaching pond, and the bioleaching of finishing heavy metal in the mud in this pond leaches.When the sludge pH in the bioleaching pond 3 drops to the value of setting, can be transported to through pump 4 earlier and carry out natural subsidence in the acidification sludge settling tank 5, the heavy metal in the mud is dissolved in the supernatant liquor, and supernatant liquor is transferred to collecting tank 6; Precipitating sludge partial reflux in the acidification sludge settling tank is inoculated and the maintenance bacterial concentration in the bioleaching pond, all the other residue precipitating sludges are transported to dehydration on the water extracter 10 again after eluriating, the liquid of separating is transferred to collecting tank 6, is transported to heavy metal pond for recovering 8 through pump 7 again.In pond for recovering 8, the method that adopts alkali to reclaim is got off wherein heavy metal precipitation, and supernatant liquor is back to sewage work (field), and the throw out in the pond for recovering 8 is through dehydration, oven dry, recovery heavy metal wherein.The bioleaching that this cover Processes and apparatus can be finished sludge containing heavy metal is handled, and when reclaiming heavy metal chromium, also makes mud directly carry out mechanical dehydration under the condition that does not add any flocculation agent.
In facility of the present invention, the effect of mud equalizing tank has the effect (seeing accompanying drawing 2) of regulating sludge concentration and storing excess sludge concurrently.At the bottom of mud equalizing tank pond, discharging pump is inhaled the position of mud point, and 0.5 * 0.5 * 0.5m is set
3The groove of (but being not limited thereto), be designed to the slope of oblique this groove at the bottom of the pond, the gradient adopted 1: 50, and what make in the equalizing tank that effect because of gravity produces is concentrated in sludge stream at the bottom of the pond naturally to groove, mud at the bottom of the pond is brought in constant renewal in, and also is convenient to empty in needs equalizing tank.The outlet conduit of sludge pump 4 is designed to two-way, one tunnel charging as the bioleaching pond, another road is as the pump circulation of mud equalizing tank, pump circulation pipeline 1 can be divided into some arms 2, under two gate valve 3 mating reactions, carry out the pump circulation of primary sludge in the equalizing tank earlier, and loop branch pipe is designed to different angles, make the ducted mud of pump circulation get back to positions different in the equalizing tank, to reach the purpose of mixing mud, then primary sludge is transported in the bioleaching pond.
The bioleaching reaction tank is most important facility in this technology (referring to shown in Figure 3), and the eluviation of microorganism is finished in this facility.Type is good with round, ellipse in pond, bioleaching pond, be provided with therein and stir and aerating apparatus, reach vertical baffle plate 12 is installed around pool wall, bioleaching pond 3 can adopt acid resisting material to build up, also can adopt skeleton construction, when adopting skeleton construction, wall is done rotproofing with Resins, epoxy within it, does WATER REPELLENT at outer wall.In the bioleaching pond heat exchanger is set, the pool wall outside adopts lagging material to be incubated processing.As shown in Figure 2, the stirring mechanism in the bioleaching pond comprises motor 2, speed reduction unit 3, load-bearing device 5, stir shaft 6, shaft coupling 7, impeller 8 etc.Motor 2 and speed reduction unit 3 can adopt vertical structure, also can adopt horizontal type structure.The effect of whipping appts is under the cooperation of baffle plate 12, makes material comprise that the nutritive substance sulphur powder of interpolation mixes in reaction tank, and also the bubble that the aeration mechanism that hereinafter mentions is produced carries out certain cutting apart, and increases the transmission of oxygen in mud in the bubble.Here, the design of impeller 8 is crucial in the stirring mechanism, to avoid producing bigger shearing force, can produce stronger mixed effect again.The characteristics higher according to the mud solid content, the impeller of being mentioned in the specification sheets of the present invention 8 adopts plate blade and the tiltedly combination of blade sheet, is designed to a kind of combined blade with plug-flow and advection effect, this cover stirring mechanism has stronger mixed ability and small shearing force, referring to accompanying drawing 4.General 3-6 blade of use (but not limitting therewith) is welded on makes impeller on the blade seat.
In the present invention, the aeration mechanism supporting with bioleaching pond (referring to accompanying drawing 3) comprises air compressor, under meter 14, micro-hole aerator 10 etc.The effect of aeration mechanism, be that air that air compressor is produced is through inlet pipe 22, under meter 14, air distribution pipe 11 in the pond, micro-hole aerator 10, form with microbubble is dispersed in the mud, guarantees that the dissolved oxygen in the mud reaches the level of processing requirement, makes the microorganism of adding in the mud can normal growth.The size of air compressor machine air demand is determined by processing requirement.
The bioleaching reaction tank is provided with an affiliated facility---and nutrition self-feeding pond 17 (referring to accompanying drawing 3).When adding new primary sludge in the bioleaching pond, the start signal 15 of fresh feed pump is given the agitator motor 16 that stirs in the nutrition self-feeding pond 17, and magnetic valve 18, when bioleaching reaction tank fresh feed pump quits work, agitator motor 16 in the self-feeding pond 17 also quits work, magnetic valve 18 cuts out simultaneously, realizes nutraceutical self-feeding.Finish under the synergy of nutraceutical add-on by on time and gate valve 19.
The Resins, epoxy method for anticorrosion treatment that the present invention is mentioned, container for skeleton construction, in its pool wall inboard, the application prescription of Resins, epoxy is pressed Resins, epoxy WRS618: epoxy curing agent: dibutyl phthalate (DBP)=4: 1: 2, prepare mixture, now with the current, carry out application, every time construction consumption is in Resins, epoxy 125g/m
2, after following 72 hours completely solidified of room temperature, still, brush again second time by this proportioning, consumption.In addition, can also adopt in the steel reinforced concrete pool inner wall surface and paste 3-7 layer woven fiber glass, every layer of method that all is coated with Resins, epoxy carried out anticorrosion.For these members that contact in material such as paddle wheel, stir shaft, plate washer, can adopt acid resisting material to make, when adopting general carbon steel material to make, it is anticorrosion to adopt following method to carry out, Resins, epoxy WSR610 (4 parts): solidifying agent 605 (3 parts): phthalic acid two butyric acid (1 part) carry out proportioning, this prescription makes Resins, epoxy thick and heavy slightly, is suitable for brushing on steel material.Be coated on the steel agitator after during enforcement this Resins, epoxy being mixed well, on the steel baffle plate, the 24h after fixing, 48h reaches completely solidified.Bright in appearance, the feel coating is full flexible.
Because mentioned processing requirement is in treating processes among the present invention, microorganism optimum envrionment temperature is 25 ℃-35 ℃, in the bioleaching pond heat exchanger is set, two kinds of patterns (referring to accompanying drawing 3) can be arranged: a kind of is with placing the electric heater 13 that the resistance wire sintering forms in copper pipe or the stainless-steel pipe; Another kind is at the bottom of the reaction tank pond and pool wall is installed snake pipe 21, utilizes hot water (can utilize enterprise's used heat resource, biogas resource, solar energy resources etc.), is undertaken heat passage by circulating hot water in the pipeline.Use thermistor to make temp probe 20 in the reaction tank simultaneously, under the control of temperature controller, the working condition of control heat exchange, mud in the bioleaching pond can be remained on carry out bioleaching under the constant temperature of setting and handle, make the mentioned Processes and apparatus of the present invention can normally operation in the season of cold.
When the heavy metal content in the primary sludge was higher, for the ease of the elutriation of mud, the present invention also comprised an acidification sludge settling tank (accompanying drawing 5).So-called acidification sludge, be meant that primary sludge is finished bioleaching and handled in the bioleaching pond after, the mud of the pH of mud about 1.95.Acidification sludge in the bioleaching pond is transported to sludge pump (flow passage is divided into stainless steel) and carries out natural subsidence in the acidification sludge settling tank, and acidification sludge is through the natural subsidence of a few hours, and the solid-liquid layering is obvious, and the liquid on top is rich in heavy metal.On acidification sludge settling tank pool wall 1, be provided with form 3 and, be doline mud-collecting slot and mud discharging mouth 4 at the bottom of the pond along several gate valves 5 are set on the short transverse in pond.(2 is the acidification sludge liquid level).According to the corresponding position of solid-liquid interface in the acidification sludge settling tank, open the gate valve of corresponding position, the liquid that is rich in heavy metal is flow in the collecting tank 5 under the effect of deadweight.
Processes and apparatus of the present invention also comprises a heavy metal pond for recovering, as shown in Figure 6.The liquid (comprising the liquid that contains heavy metal that supernatant liquor that mudpan produces and water extracter produce) that contains heavy metal collects in the collecting tank, use acidproof sump pump (flow passage is divided into stainless steel) to be transported in the heavy metal pond for recovering again, in pond for recovering, be provided with the speed change stirring mechanism, comprise electromagnetic adjustable speed motor 2, speed reduction unit 3, impeller load-bearing device 5,, stir shaft 6, impeller 7 and shaft coupling 8 are formed, pyramid type sludge hopper and mud discharging mouth 9 are set at the bottom of the pond, and pool wall is provided with vertical baffle plate 10, can realize that like this speed change of stirring mechanism stirs, be convenient to finishing of flocculation sediment, the heavy metal in the primary sludge gets off with regard to precipitated.The mud cake of precipitating sludge in the heavy metal pond for recovering after dehydration mainly is the salt of heavy metal, recyclable utilization heavy metal composition wherein, or be cured landfill.
Four, description of drawings
Fig. 1 is a bioleaching engineering principal facility synoptic diagram; Fig. 2 is mud equalizing tank and pump circulation pipeline synoptic diagram thereof; Fig. 3 is a bioleaching pond synoptic diagram; Fig. 4 is a paddle wheel shape synoptic diagram; Fig. 5 is an acidification sludge settling tank synoptic diagram; Fig. 6 is a heavy metal pond for recovering synoptic diagram.
Five, case history
The mentioned Processes and apparatus according to the present invention, the cover bioleaching method set up is handled the technical process and the job facilities of mud.In this project example, mud equalizing tank 35m
3, cylinder shape bioleaching pond 20m
3, acidification sludge settling tank 10m
3, heavy metal pond for recovering 5m
3Stirrer power is 2.2kw, Root's blower power 5.5KW, blast 39kpa, air quantity 4m
3/ min; Water extracter is horizontal spiral centrifuge (LW220 * 930)
For handling mud is to contain the higher leather-making mud of heavy metal chromium, and solid content is 3.7%, and the content of chromium reaches the dried mud of 15900mg/kg.In the bioleaching pond, microorganism is handled through the leaching of 3d-6d, and the pH of mud drops to 1.5-1.9, heavy metal chromium 100% stripping in the mud.The mud that leaching was handled is after natural sedimentation, eluriating, with horizontal centrifuge dehydration.The rate of recovery of the heavy metal chromium in the mud is 95%, and the content of the chromium in the mud cake of primary sludge after bioleaching is handled is 580mg/kg.The processing costs of mud per ton is below 150 yuan.Adopt technology of the present invention and equipment thereof, realized mud minimizing, innoxious, clean, the processing of resource utilization.
Claims (13)
- The mentioned Processes and apparatus of the present invention comprise, mud equalizing tank, bioleaching pond, acidification sludge settling tank, collecting tank, heavy metal pond for recovering, aerator and supporting pipeline, pump, valve, dehydration equipment etc.A kind of technology of handling mud comprises following process at least: utilize thiobacillus thiooxidans under aerobic condition, sulphur powder, sulfurous iron ore etc. are oxidized to sulfuric acid, the pH of mud is descended, when the sludge pH value dropped to 1.9, heavy metal 100% ground in the mud was dissolved in the liquid phase, and mud is after dehydration, remove the heavy metal in the mud, the liquid of separating that contains heavy metal is used alkaline precipitation again, reclaims heavy metal wherein.
- 2. according to claim 1, the mud equalizing tank is characterised in that, is the slope that oblique shell pump is inhaled the mud mouth at the bottom of the pond.The sludge pump outlet conduit is designed to two-way, respectively as the circulation of mud in the charging in bioleaching pond and the mud equalizing tank.Under the effect of a plurality of gate valves, earlier the mud in the mud equalizing tank is carried out pump circulation with sludge pump, make that mud obtains mixing in the pond, and then be pumped in the bioleaching pond.
- 3. according to claim 1, the bioleaching pond is characterised in that the pond type in bioleaching pond is round, ellipse, but does not limit therewith, and the stirring mechanism of She Zhiing comprises motor, speed reduction unit, load-bearing device, stir shaft, shaft coupling, impeller etc. therein; Motor and speed reduction unit can adopt vertical structure, also can adopt horizontal type structure; The pool wall inboard is provided with several vertical baffle plates; Bioleaching pond inwall adopts Resins, epoxy anticorrosion, also can the multiple glazing fiber on the method for every layer of brushwork epoxy resin carry out anticorrosion.
- 4. according to right 3, the bioleaching pond also is provided with an affiliated facility---nutrition self-feeding pond.When adding new primary sludge in the bioleaching pond, give the agitator motor that stirs in the nutrition self-feeding pond with the start signal of fresh feed pump, and magnetic valve; When bioleaching reaction tank fresh feed pump quit work, the agitator motor in the self-feeding pond also quit work, and closed electromagnetic valve is realized nutraceutical self-feeding simultaneously; Finish under the synergy of nutraceutical add-on by on time and gate valve open degree.
- 5. according to claim 3, also be provided with aeration mechanism in the bioleaching pond, comprise air compressor, under meter, micro-hole aerator etc. at least; The effect of aeration mechanism is air air distribution pipe in inlet pipe, under meter, pond that air compressor is produced, micro-hole aerator.
- 6. according to claim 3, also be provided with heat exchanger in the bioleaching pond, two kinds of patterns can be arranged: a kind of is with placing the electric heater that the resistance wire sintering forms in copper pipe or the stainless-steel pipe; Another kind is at the bottom of the reaction tank pond and pool wall is installed stainless steel pipes, is undertaken heat passage by circulating hot water in the pipeline.Use thermistor to make temp probe in the reaction tank simultaneously, also comprise a sleeving temperature monitoring instrument.The working condition of temperature controller control heat exchanger can remain on mud in the bioleaching pond to carry out bioleaching under the constant temperature of setting and handles, and makes the mentioned Processes and apparatus of the present invention can normally operation in the season of cold.
- 7. according to claim 3, the blade of paddle wheel is made the combined blade that flat blade combines with oblique blade, and tiltedly the vertical oblique angle of blade is 45 degree, but is not limited thereto.
- 8. according to claim 1, the acidification sludge settling tank is characterised in that, pool wall is provided with form and along several gate valves are set on the short transverse in pond, is doline mud-collecting slot and mud discharging mouth at the bottom of the pond, so that open corresponding valve by the position of solid-liquid interface after the mud natural subsidence.The pond inwall carries out rotproofing.
- 9. according to claim 1, collecting tank is characterised in that its effect is to collect the sewage of separating in the flow process that contains heavy metal.The pond inwall carries out rotproofing.
- 10. according to claim 1, the heavy metal pond for recovering is characterised in that, is provided with the speed change stirring mechanism, comprises electromagnetic adjustable speed motor, speed reduction unit, impeller load-bearing device, stir shaft, impeller and shaft coupling composition, pyramid type sludge hopper and mud discharging mouth are set at the bottom of the pond, and pool wall is provided with vertical baffle plate.Heavy metal pond for recovering inwall carries out rotproofing.
- 11. according to claim 3,8,9,10 is described, adopts Resins, epoxy rot-resistant prescription to have two kinds, but be not limited thereto.In Steel Concrete pool wall inboard, adopt Resins, epoxy WRS618: epoxy curing agent: adjacent this dioctyl phthalate dibutylester=4: 1: 2; On general carbon steel material, by Resins, epoxy WSR610: solidifying agent 605: phthalic acid two butyric acid=carry out proportioning at 4: 3: 1, now with the current.
- 12. according to claim 1, comprise a cover air blast aerator.
- 13. require 1 describedly according to claim, comprise a cover mechanical dewatering equipment.
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| CNB200410014801XA CN1323959C (en) | 2004-04-30 | 2004-04-30 | Process and its device for biologically removing heavy metal in mud |
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Assignee: GENERAL TREATMENT ENVIRONMENT (BEIJING) LTD. Assignor: Nanjing Agricultural University Contract record no.: 2011110000042 Denomination of invention: Process and its device for biologically removing heavy metal in mud Granted publication date: 20070704 License type: Exclusive License Open date: 20050803 Record date: 20110616 |
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Application publication date: 20050803 Assignee: GENERAL TREATMENT ENVIRONMENT (BEIJING) Co.,Ltd. Assignor: Nanjing Agricultural University Contract record no.: 2015990000952 Denomination of invention: Process and its device for biologically removing heavy metal in mud Granted publication date: 20070704 License type: Exclusive License Record date: 20151116 |
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