CN104909526B - Device for removing heavy metals in sludge by using electro-dynamic method and synchronously and deeply dehydrating sludge - Google Patents
Device for removing heavy metals in sludge by using electro-dynamic method and synchronously and deeply dehydrating sludge Download PDFInfo
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- CN104909526B CN104909526B CN201510365507.1A CN201510365507A CN104909526B CN 104909526 B CN104909526 B CN 104909526B CN 201510365507 A CN201510365507 A CN 201510365507A CN 104909526 B CN104909526 B CN 104909526B
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Abstract
The invention relates to a device for removing heavy metals in sludge by using an electro-dynamic method and synchronously and deeply dehydrating sludge in a process of conveying digested sludge. The device comprises a sludge conveying pipeline, a sludge pump, a direct-current power supply, electrodes and ion exchange membranes/ porous medium membranes, wherein the treatment object of the device is anaerobic digestion sludge; the electric remediation is implemented in the sludge conveying process in the pipeline; a positive electrode and a negative electrode are arranged on the inner wall of the pipeline; a positive chamber and a negative chamber are formed in two sides of the pipeline; the ion exchange membranes/ porous medium membranes are arranged in the positive chamber and the negative chamber; the gap between the electrodes and the ion exchange membranes/ porous medium membranes is filled with an electrolyte solution; the positive electrode and the negative electrode are connected with the power supply by virtue of a lead. By virtue of the device, the heavy metals in the sludge are removed by electrodialysis and electrolysis techniques in the process of conveying the anaerobic digestion sludge via the pipeline; meanwhile, the partial water in the sludge can be removed under the action of the ion exchange membranes/ porous medium membranes; the device can be used for effectively utilizing the conveying power, and is convenient to operate; the subsequent resource utilization of the sludge can be facilitated.
Description
Technical field
The invention belongs to environmental protection technical field, and in particular to gone using electrodynamics method in a kind of anaerobically digested sludge
Except Heavy Metals in Sludge and synchronous deep dehydrator.
Background technology
In recent years, China's treatment rate of domestic sewage is improved year by year, and the sludge yield of municipal sewage plant is also sharply increased.
Containing abundant organic matter in sludge, can as a kind of biomass energy, nitrogen, phosphorus, potassium enriched in sludge etc. be plant and
The indispensable nutrients of crop growth, and can be as fertilizer and soil conditioner.And can assemble simultaneously in sludge certain
The heavy metal of amount, heavy metal has non-biodegradable and toxicity, if Treatment of Sludge is improper to cause secondary pollution to environment, and
And the recycling of sludge can be directly affected.Therefore, how removing or reducing heavy metals in city sewage sludge content has turned into city
The problem that city's sludge treatment and resource must be solved.
In the prior art, heavy metal pollution treating sludge method mainly includes：（1）Curing/stabilizing, the process be by
Harmful waste is by chemical transformation or is introduced into the lattice of certain stabilization, or harmful waste inert material is contained
Process, heavy metal has the possibility for leaching and being redissolved in the method, and from from the aspect of recycling, the method also will progressively by
Substitution；（2）Chemical reagent extraction method, using chlorination, ion exchange, acidification, chelating agent and surfactant
Complexing, indissoluble state metallic compound is formed soluble metal ion or metal complex, but the method will be consumed
Substantial amounts of chemical reagent, and the medicament for remaining can also influence the Land_use change of sludge；（3）Microorganism leaching method, by bacterium pair
The oxidation of iron and sulphur in sludge, raises the oxidation-reduction potential of sludge, pH value reduction, so that heavy metal dissolves, then
The heavy metal leaching dissolved out, has just been reached reduces the purpose of Heavy Metal Level In Sludge；（4）Burn, burning method treatment
Sludge, the poisonous and harmful element in decomposable asymmetric choice net sludge makes heavy metal accumulation, but effectively to control the place after burning condition and burning
Reason technology, it is to avoid the generation of secondary pollution；（5）Phytoremediation, reparation of the plant to Heavy Metals in Sludge is steady by plant
Fixed, three kinds of modes of phytovolatilization and plant absorption realize that the method is in theoretical system, repair mechanisms and renovation technique technical side
Face also needs perfect.
Electric repairing technique be it is a kind of it is effective removal pollutant method, it have reagent dosage it is few, simple to operate, removal
Efficiency high, process time are short, the advantages of several heavy metal species can be removed simultaneously, porosity big for unit weight is low and permeability is low
Pollutant medium also has preferable repairing effect.At present, electric repairing technique is mainly used in repairing for heavy-metal contaminated soil
It is multiple, for sludge heavy-metal removal in terms of technical research also need it is further perfect.
The content of the invention
In sludge being removed it is an object of the invention to provide one kind using electrodynamics method in digested sludge transmit process
Heavy metal and synchronous sludge deep dehydrator.The device can make anaerobically digested sludge pass through electric osmose in pipeline transmit process
Analysis, electrolysis tech is by the heavy metal accumulation in sludge to battery lead plate or concentrates in thickener, meanwhile, sludge in processing procedure,
Moisture can be by amberplex/porous dielectric film finally reducing the moisture content of sludge.
In order to realize technical purpose of the invention, technical scheme is as follows.
One kind removes Heavy Metals in Sludge and synchronous deep dehydration in digested sludge transmit process using electrodynamics method
Device, described device be used for anaerobically digested sludge, device by sludge transfer canal, sludge pump, power supply, anode chamber, cathode chamber, from
Proton exchange/porous dielectric film composition, wherein：Sludge transfer canal inwall both sides set anode chamber and cathode chamber, the anode
Indoor setting anode, the anode sets anion-exchange membrane/porous Jie near sludge transfer canal inwall in the anode chamber
Plasma membrane, is full of electrolyte solution between anode and anion-exchange membrane/porous dielectric film；Negative electrode, institute are set in the cathode chamber
State negative electrode and cation-exchange membrane/porous dielectric film be set in sludge transfer canal inwall, the cathode chamber, negative electrode and sun from
Electrolyte solution is full of between proton exchange/porous dielectric film；The anode and negative electrode are connected with power supply by wire；It is described
Sludge transfer canal connects sludge pump, anaerobically digested sludge is flowed from bottom to top in sludge transfer canal by sludge pump；
Make anaerobically digested sludge in sludge transfer canal transmit process by electrodialysis, electrolysis tech by the weight in anaerobically digested sludge
Metal enrichment is to battery lead plate or concentrates in thickener, meanwhile, in processing procedure, moisture can be handed over anaerobically digested sludge by ion
Film/porous dielectric film is changed finally to reduce the moisture content of sludge；Described power supply uses dc source, and voltage gradient uses 10V/
cm。
In the present invention, described electro reclamation uses electrodialysis, electrolysis principle, and its process is in anaerobically digested sludge pipeline
Realized in transmit process, transmission power is provided by sludge pump.
In the present invention, the cation-exchange membrane/porous dielectric film is positioned close to cathode chamber side, described anion
Exchange membrane/porous dielectric film is positioned close to anode chamber side.
In the present invention, described anode material and cathode material can use graphite electrode, but the specific material of battery lead plate without
Limitation.
In the present invention, described cation-exchange membrane/porous dielectric film and anion-exchange membrane/porous dielectric film have one
Fixed water permeability, during pipeline is flowed through, hydrone can pass through amberplex/porous media to anaerobically digested sludge
Film, reaches the purpose for reducing moisture percentage in sewage sludge.
In the present invention, described power supply uses dc source, and voltage gradient uses 10V/cm.
The hydrogen and oxygen that generation is electrolysed in the present invention, at negative electrode and anode can be recycled further.
In the present invention, described electrolyte solution can use NaCl solution, or directly be entered using the biogas slurry after treatment
Row is recycled.
The invention has the advantages that：
1st, the present invention is removed using electrodialysis, electrolysis principle to the heavy metal in sludge, it is characterized in that this electronic is repaiied
Recovering technology is realized in sludge pipe transmit process, improves power utilization rate, simplifies the mistake of sludge heavy-metal treatment
Journey, it is simple to operate.
2nd, by application of membrane to sludge handling process, when sludge flows through pipeline, part hydrone can for the present invention
Through amberplex/porous dielectric film, so as to reduce the moisture content of sludge, the cost of follow-up sludge dewatering can be reduced.
3rd, the present invention be able to can be made using being crossed by this PROCESS FOR TREATMENT without heavy metal biogas slurry as electrolyte solution
Biogas slurry is used, and operating cost is reduced again.
4th, the hydrogen and oxygen that the present invention can be produced to water electrolysis at anodic-cathodic are recycled.
Brief description of the drawings
Fig. 1 is partial schematic diagram of the invention.
Label in figure：1- sludge transfer canals, 2- sludge pumps, 3- dc sources, 4- wires, 5- anodes, 6- negative electrodes, 7- sun
Pole room, 8- cathode chambers, 9- cation-exchange membranes/porous dielectric film, 10- anion-exchange membranes/porous dielectric film.
Specific embodiment
The present invention is further illustrated below by embodiment, but protection scope of the present invention is not limited to the content.
Embodiment 1：
As shown in figure 1, described device is by sludge transfer canal 1, sludge pump 2, dc source 3, wire 4, anode 5, negative electrode
6th, anode chamber 7, cathode chamber 8, cation-exchange membrane/porous dielectric film 9, anion-exchange membrane/porous dielectric film 10 are constituted, its
In, anaerobically digested sludge flows under the power provided by sludge pump 2 in sludge transfer canal 1, and the two ends of dc source 3 lead to
Cross wire 4 to be connected with anode 5 and negative electrode 6 respectively, in the presence of dc source 3, voltage gradient is set to 10V/cm, and at this
It is 14.5V in case.By the treatment of 3 hours, electric current was reduced to 0mA by initial 70mA, that is, mean the huge sum of money in sludge
Category ion is moved by cation-exchange membrane/porous dielectric film 9 to negative electrode 6, and in concentration basin concentration or the final electricity on electrode
Solution deposition, while the hydrone in sludge can be by amberplex（Nafion117）/ porous dielectric film, so as to reduce dirt
The moisture content of mud（By 85% → 60%）.
Claims (4)
1. a kind of using electrodynamics method removal sludge heavy-metal and synchronous sludge deep dehydrator, described device is used for anaerobism
Digested sludge, device is by sludge transfer canal, sludge pump, power supply, anode chamber, cathode chamber, amberplex/porous dielectric film group
Into, it is characterised in that：Sludge transfer canal inwall both sides set anode chamber and cathode chamber, and anode, institute are set in the anode chamber
Anode is stated near sludge transfer canal inwall, anion-exchange membrane/porous dielectric film is set the anode chamber in, anode and the moon from
Electrolyte solution is full of between proton exchange/porous dielectric film；Negative electrode is set in the cathode chamber, and the negative electrode is passed near sludge
Send and cation-exchange membrane/porous dielectric film, negative electrode and cation-exchange membrane/porous Jie are set in inner-walls of duct, the cathode chamber
Electrolyte solution is full of between plasma membrane；The anode and negative electrode are connected with power supply by wire；The sludge transfer canal connection
Sludge pump, makes anaerobically digested sludge be flowed from bottom to top in sludge transfer canal by sludge pump；Anaerobically digested sludge is set to exist
By electrodialysis, electrolysis tech by the heavy metal accumulation in anaerobically digested sludge to battery lead plate in sludge transfer canal transmit process
Or thickener is concentrated in, meanwhile, in processing procedure, moisture can be by amberplex/porous dielectric film for anaerobically digested sludge
Finally to reduce the moisture content of sludge；Described power supply uses dc source, and voltage gradient uses 10V/cm.
2. device according to claim 1, it is characterised in that the cation-exchange membrane/porous dielectric film is positioned close to
Cathode chamber side, described anion-exchange membrane/porous dielectric film is positioned close to anode chamber side.
3. device according to claim 1, it is characterised in that described anode material and cathode material uses graphite electrode,
But the specific material of battery lead plate is unrestricted.
4. device according to claim 1, it is characterised in that described electrolyte solution uses NaCl solution, or directly
Using the biogas slurry after treatment, utilization is circulated.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510365507.1A CN104909526B (en) | 2015-06-29 | 2015-06-29 | Device for removing heavy metals in sludge by using electro-dynamic method and synchronously and deeply dehydrating sludge |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510365507.1A CN104909526B (en) | 2015-06-29 | 2015-06-29 | Device for removing heavy metals in sludge by using electro-dynamic method and synchronously and deeply dehydrating sludge |
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| Publication Number | Publication Date |
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| CN104909526A CN104909526A (en) | 2015-09-16 |
| CN104909526B true CN104909526B (en) | 2017-05-24 |
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Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106044965B (en) * | 2016-08-12 | 2023-01-10 | 宁波市海智材料产业创新研究院 | Device and method for recovering heavy metals in electroplating wastewater |
| JP2018035383A (en) * | 2016-08-29 | 2018-03-08 | 株式会社ギャラキシー | Valuable article recovering method |
| CN110293125A (en) * | 2019-04-28 | 2019-10-01 | 南通大学 | It is a kind of original position electro reclamation and reinforce ultra-soft Polluted Soil device and method |
| CN110422956A (en) * | 2019-07-15 | 2019-11-08 | 湖南大学 | A kind of shield slurry dehydration device |
| CN112573799B (en) * | 2020-12-31 | 2022-10-14 | 哈尔滨工业大学 | Sludge drying combined wetland system based on mine restoration |
| CN112978763A (en) * | 2021-04-19 | 2021-06-18 | 中国科学院城市环境研究所 | Method for producing fertilizer by electrodialysis |
| CN113798318A (en) * | 2021-09-18 | 2021-12-17 | 云南省生态环境科学研究院 | Electrochemical remediation method of lead-zinc combined contaminated soil based on eutectic solvent |
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| CN2721628Y (en) * | 2004-08-27 | 2005-08-31 | 桂林工学院 | DC. electrolytic sludge reactor |
| CN202610083U (en) * | 2011-12-06 | 2012-12-19 | 中山大学 | Device for removing heavy metal from sludge in coupled film separating technology and electrokinetic technology |
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