CN202610083U - Device for removing heavy metal from sludge in coupled film separating technology and electrokinetic technology - Google Patents

Device for removing heavy metal from sludge in coupled film separating technology and electrokinetic technology Download PDF

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Publication number
CN202610083U
CN202610083U CN 201120506051 CN201120506051U CN202610083U CN 202610083 U CN202610083 U CN 202610083U CN 201120506051 CN201120506051 CN 201120506051 CN 201120506051 U CN201120506051 U CN 201120506051U CN 202610083 U CN202610083 U CN 202610083U
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China
Prior art keywords
sludge
technology
chamber
electrokinetic
heavy metal
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Expired - Fee Related
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CN 201120506051
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Chinese (zh)
Inventor
雷恒毅
陈凯
白涛
姚创
张兴红
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GUANGZHOU ZHUJIANG ENVIRONMENTAL PROTECTION TECHNOLOGY DEVELOPMENT CO LTD
Sun Yat Sen University
National Sun Yat Sen University
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GUANGZHOU ZHUJIANG ENVIRONMENTAL PROTECTION TECHNOLOGY DEVELOPMENT CO LTD
National Sun Yat Sen University
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Priority to CN 201120506051 priority Critical patent/CN202610083U/en
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Abstract

The utility model relates to a device for removing heavy metal from sludge in coupled film separating technology and electrokinetic technology. The device for removing the heavy metal from the sludge in the coupled film separating technology and the electrokinetic technology comprises a power supply, an electrode chamber, a sludge chamber, a film separating system and an electrolyte replacing system. An anode chamber (2) and a cathode chamber (3) are arranged on two sides of the sludge chamber (4), and a filter screen (7) is used to separate the sludge chamber from the electrode chamber. An anode (5) in the electrode chamber is a titanium-ruthenium net, and a cathode (6) is a titanium net. An ion selective film is arranged in the anode chamber (2), and another ion selective film is arranged in the cathode chamber (3). The anode and the cathode are respectively connected with the power supply through conducting wires. The electrolyte replacing system is utilized to control the potential of hydrogen (pH) of the anode chamber and the PH of the cathode chamber. According to the device for removing the heavy metal from the sludge in the coupled film separating technology and the electrokinetic technology, the electrokinetic technology repairing technology is utilized in sludge treatment, the coupled film separating technology is used to solve the problem that pH changes in the sludge treatment process, operation is convenient, and subsequent resource utilization of sludge is facilitated.

Description

The sludge heavy-metal removal device of a kind of coupled film stripping technique and electrokinetic technique
Technical field
The utility model belongs to field of environment protection, particularly relates to the moving electrical treating device of a kind of mud, is applicable to the removal of heavy metal in the municipal sewage sludge.
Background technology
In the last few years, along with China's rapid economic development, quickening of urbanization process and the people raising to environmental requirement, municipal drainage of China and sewage treatment capacity also obtained very fast development.Expect 2015, the quantity of China municipal sewage plant will reach more than 2000, and sewage treatment capacity will reach disposes of sewage more than 200,000,000 ton every day, and wastewater treatment rate will reach more than 80%.In city sewage treatment works, the mud of generation accounts for 0.3%~0.5% of the amount of disposing of sewage; If carry out advanced treatment, sludge quantity also possibly increase by 0.5~1.0 times.The wet mud of discharging in 2010 will reach about 1700 * 10 4T/a (dehydration back water ratio is by 80%).Contain a large amount of organism, abundant nutrition such as nitrogen phosphorus, heavy metal and pathogenic bacterium and pathogenic bacteria etc. in the mud.Wherein heavy metal has non-degradable property and toxicity, and this has limited the recycling of mud greatly,
The treatment process of heavy metal mainly comprises in the mud: (1) physics method changes the form that exists of heavy metal in the municipal sludge through adding certain passivator or chemicals.Following several method is arranged usually: cement solidification method, lime solidification method, thermoplastic solidification method, vitrifying technology, from glued curing technology etc.; This method can not make heavy metal from mud, remove; And with the change of envrionment conditions, heavy metal also has the dissolved maybe again; (2) chemical method adds chemical agent in mud, through the complexing action of chlorization, ion exchange, acidification, intercalating agent and tensio-active agent, make indissoluble attitude heavy metal compound form soluble heavy metal ion or complex compound.Chemical method in use will consume a large amount of acid, and the acid that neutralization is drenched in the fluid consumes a large amount of lime again, and residual medicament can reduce the manurial value of mud.(3) biological process; Through the oxygenizement of bacterium to iron in the mud and sulphur; The reduction potential rising pH value of oxygen in the mud is reduced, thereby heavy metal is dissolved, adopt direct or indirect leaching method that the leaching of dissolved heavy metal is come out then; Thereby reduction heavy metal content, biological process receive the restriction of the conditions such as acidity of mud after the existence restriction, sulfate contamination, processing of bacterium; (4) plant extract method is utilized the root system excess of obligate plant to absorb one or more pollutents, particularly toxic heavy metal, and it is transferred to plant stem-leaf, gathers in cauline leaf then, and handle in the strange land.The plant method receives floristics, economical character, the restriction of aspects such as the prevention and control of plant diseases, pest control.
Electrokinetic technique is one of method of the most promising removal pollutent, also can be described as moving electricity and repairs, moves electric the recovery and electrochemical purification.The advantage of electrokinetic technique is that required expense is low, and can repair multiple pollutent, has also that reagent dosage is few, easy for installation, simple to operate, energy consumption is low and repair advantages such as thorough.Electrokinetic technique has short characteristics of high efficiency, working time at the low-permeability soil of pollutions such as purification of heavy metal, organism and mud.
The ultimate principle of electrokinetic technique is in solid phase/liquid phase systems, to insert electrode, forms electric field through applying faint direct current, and the various electro kinetic effects that utilize DC electric field to produce make pollutent take place to move and be enriched in the cathodic area, thereby with pollutant removal.
Summary of the invention
In moving electric repair process, electrode reaction produces a large amount of H respectively at the positive and negative utmost point +And OH -, OH under electric field action -The anode migration, H +To cathodic migration, because most of heavy metal meeting and OH -Precipitin reaction takes place, the OH of anode migration -Can react with heavy metal and generate deposition, thereby influence the transport property and the clearance of heavy metal to cathodic migration.Simultaneously, H +In the process of cathodic migration, can cause sludge pH to reduce, the mud acidifying, though this phenomenon helps the stripping and the migration of heavy metal in the mud, the recycling of mud acidifying meeting restriction mud.Therefore pH value how to control mud is the key that solves moving electric recovery technique of mud and recycling.
The purpose of the utility model provides a cover and is suitable for the moving electrical treating device that sludge heavy-metal is removed, and will move electric recovery technique and membrane technique and be coupled, and can effectively remove the heavy metal in the mud.The purpose of the utility model is achieved in that
(1) the utility model device comprises power supply, electrode vessel, mud room, film separating system and electrolytic solution replacing system, and it is characterized in that: mud room (4) both sides are provided with anolyte compartment (2) and cathode compartment (3), and through filter screen (7) mud room and electrode vessel are separated; Electrode vessel inner anode (5) adopts titanium ruthenium net, and negative electrode (6) adopts the titanium net; In anolyte compartment (2) and the cathode compartment (3) ion selective membrane is set; Through lead negative electrode is connected with power supply with anode; Utilize electrolytic solution to change the pH of system control cathode chamber and anolyte compartment.Titanium ruthenium net is positioned in the anolyte compartment (2) as anode (5), and the titanium net is positioned in the cathode compartment (3) as negative electrode (6), and the polar net aperture is 4mm * 10mm, links to each other with direct supply through lead, and titanium ruthenium netting gear has advantages of higher stability and erosion resistance, and current efficiency is high.Mud room (4) separates through filter screen (7) and anolyte compartment and cathode compartment, prevents that mud from entering into utmost point chamber.After the energising, voltage gradient is controlled at 1~3V/cm, can effectively prevent the mud heating problem that overtension causes, and has guaranteed the travelling speed of heavy metal simultaneously again.Between anolyte compartment (2) and mud room (4), anion-selective membrane (8) is set, negatively charged ion can pass through this tunic, and H +Then be limited in to get into mud room in the anolyte compartment, prevent the mud acidifying; Between cathode compartment (3) and mud room (4), cation selective film (9) is set, positively charged ion can pass through, and OH -Then be limited in cathode compartment, can't get into mud room, prevent heavy metal and OH -Cause clearance to descend in mud indoor production deposition.Anolyte is changed system by liquid storage tank (13), and peristaltic pump (10) and collecting tank (11) constitute, under the effect of peristaltic pump; Pure water gets into the anolyte compartment from the bottom; Water outlet is then overflowed from upper portion of anode chamber and is flowed in the collecting chamber, changes system through anolyte, can avoid the pH of anolyte compartment to descend too fast low excessively.Catholyte replacing system is by liquid storage tank (14); Peristaltic pump (10) and collecting tank (12) constitute, and pure water gets into cathode compartment from the bottom under the effect of peristaltic pump, and water outlet flows into collecting chamber with the mode of overflowing; Change system through catholyte, can avoid the pH of cathode compartment to raise too fast.
(2) mud room in the utility model patent, electrode vessel and film separating system adopt modular design, and promptly each component can be removed separately and cleaned and transposing, and wherein film separating system can be changed through removing.
The utlity model has following characteristics:
(1) adopts film separating system, overcome the drawback of moving electrical treating process, avoided the influence of electrolytic reaction, help the recycling sludge later use the sludge pH value.
(2) modularly be designed with operation and the maintenance that is beneficial to device.
(3) adopt titanium ruthenium net as anode, the titanium net has improved current efficiency as negative electrode.
(4) adopt pure water as electrolytic solution, reduced cost.
Description of drawings
Fig. 1 is the utility model structural representation
The 1-direct supply; The 2-anolyte compartment; The 3-cathode compartment; The 4-mud room; The 5-anode; The 6-negative electrode; The 7-filter screen; The 8-anion-selective membrane; 9-cation selective film; The 10-peristaltic pump; 11-anode collecting tank; 12-negative electrode collecting tank; 13-anode storing solution; 14-negative electrode storing solution
Fig. 2 is the sectional view of the utility model disparate modules junction A-A among Fig. 1
Specific embodiments
Below in conjunction with accompanying drawing the moving electric installation of the utility model is further explained.
This device is the design of moving electrical treating technology of coupling and membrane separation technique, on the basis of traditional moving electrical treating device, has added the membrane sepn module, with the electrolytic reaction of the solution water influence to sludge pH.Put into mud room (4) after mud after the dehydration mixes, in anolyte compartment (2) and cathode compartment (3), inject pure water respectively, open peristaltic pump (10) simultaneously, make utmost point liquid pool and collecting tank form utmost point fluid exchange as electrolytic solution; Feed after the direct current, voltage gradient is controlled at 1~3V/cm., the heavy metal in the mud moves to negative electrode under effect of electric field, since the existence of cation selective film (9), the OH that negative electrode produces -Can not get into mud room, thereby make that the electrotransport process of heavy metal is not interrupted, after processing finished, heavy metal was moved in the cathode compartment, and the heavy metal content in the mud reduces.After the modular design, the different piece of device can be removed replacing.

Claims (4)

1. the sludge heavy-metal removal device of coupled film stripping technique and electrokinetic technique; Comprise power supply, electrode vessel, mud room, film separating system and electrolytic solution replacing system; It is characterized in that: mud room (4) both sides are provided with anolyte compartment (2) and cathode compartment (3), and through filter screen (7) mud room and electrode vessel are separated; Electrode vessel inner anode (5) adopts titanium ruthenium net, and negative electrode (6) adopts the titanium net; In anolyte compartment (2) and the cathode compartment (3) ion selective membrane is set; Through lead negative electrode is connected with power supply with anode; Utilize electrolytic solution to change the pH of system control cathode chamber and anolyte compartment.
2. according to the sludge heavy-metal removal device of claims 1 described a kind of coupled film stripping technique and electrokinetic technique; It is characterized in that between anolyte compartment (2) and the mud room (4) anion-selective membrane (8) being set, between cathode compartment (3) and the mud room (4) cation selective film (9) is set.
3. according to the sludge heavy-metal removal device of claims 1 described a kind of coupled film stripping technique and electrokinetic technique, it is characterized in that anode (5) adopts titanium ruthenium net, negative electrode (6) adopts the titanium net, and the polar net aperture is 4mm * 10mm.
4. according to the sludge heavy-metal removal device of claims 1 described a kind of coupled film stripping technique and electrokinetic technique, power supply adopts direct supply, and voltage gradient is 1~3V/cm.
CN 201120506051 2011-12-06 2011-12-06 Device for removing heavy metal from sludge in coupled film separating technology and electrokinetic technology Expired - Fee Related CN202610083U (en)

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CN 201120506051 CN202610083U (en) 2011-12-06 2011-12-06 Device for removing heavy metal from sludge in coupled film separating technology and electrokinetic technology

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Application Number Priority Date Filing Date Title
CN 201120506051 CN202610083U (en) 2011-12-06 2011-12-06 Device for removing heavy metal from sludge in coupled film separating technology and electrokinetic technology

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104785505A (en) * 2015-04-29 2015-07-22 重庆大学 Method for removing heavy metals in municipal solid waste incineration fly ash
CN104909526A (en) * 2015-06-29 2015-09-16 同济大学 Device for removing heavy metals in sludge by using electro-dynamic method and synchronously and deeply dehydrating sludge
CN105601042A (en) * 2016-01-15 2016-05-25 上海秦森园林股份有限公司 Compound pollutant comprehensive treatment system with ecological vegetation trenches
CN105645703A (en) * 2014-12-04 2016-06-08 北京有色金属研究总院 Electrochemical control device for controlling pH value of electrolyte for electro-kinetic remediation of heavy metal sludge
CN105884157A (en) * 2016-05-31 2016-08-24 浙江大学 Method for removing and recovering heavy metal in sludge through electrolytic method
CN107790479A (en) * 2016-08-29 2018-03-13 银河股份有限公司 The recovery method of valuables and the minimizing technology of harmful substance

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105645703A (en) * 2014-12-04 2016-06-08 北京有色金属研究总院 Electrochemical control device for controlling pH value of electrolyte for electro-kinetic remediation of heavy metal sludge
CN104785505A (en) * 2015-04-29 2015-07-22 重庆大学 Method for removing heavy metals in municipal solid waste incineration fly ash
CN104909526A (en) * 2015-06-29 2015-09-16 同济大学 Device for removing heavy metals in sludge by using electro-dynamic method and synchronously and deeply dehydrating sludge
CN105601042A (en) * 2016-01-15 2016-05-25 上海秦森园林股份有限公司 Compound pollutant comprehensive treatment system with ecological vegetation trenches
CN105884157A (en) * 2016-05-31 2016-08-24 浙江大学 Method for removing and recovering heavy metal in sludge through electrolytic method
CN107790479A (en) * 2016-08-29 2018-03-13 银河股份有限公司 The recovery method of valuables and the minimizing technology of harmful substance

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CF01 Termination of patent right due to non-payment of annual fee
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Granted publication date: 20121219

Termination date: 20171206