CN106746395A - The method and its special purpose device of nano zero valence iron removal Heavy Metals in Sludge - Google Patents
The method and its special purpose device of nano zero valence iron removal Heavy Metals in Sludge Download PDFInfo
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- CN106746395A CN106746395A CN201611076727.3A CN201611076727A CN106746395A CN 106746395 A CN106746395 A CN 106746395A CN 201611076727 A CN201611076727 A CN 201611076727A CN 106746395 A CN106746395 A CN 106746395A
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/20—Heavy metals or heavy metal compounds
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- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Treatment Of Sludge (AREA)
Abstract
The invention discloses the special purpose device that nano zero valence iron removes Heavy Metals in Sludge, belong to environmental technology field, it includes first reactor and second reactor, is transferred in second reactor by sludge pump through the pretreated sludge of first reactor；Agitator is respectively provided with the middle part of first reactor and second reactor；In the bottom of first reactor, ultrasonic oscillator is set；The magnet and heavy metal recovery mouthful for using cooperatively are provided with the bottom of second reactor, second reactor is connected via another sludge pump with muddy water centrifugal separating device.The invention also discloses the method that nano zero valence iron removes Heavy Metals in Sludge.Special purpose device of the invention, first reactor, last digestion agent separating and recovering are applied to by pretreatment stage and the stage of reaction jointly；Ultrasonic applications in course of reaction, are reduced the reaction time by the method for the present invention, lift treatment effeciency, effectively remove Heavy Metal Pollution in Sludge, and the development of environment and agricultural is promoted while turning waste into wealth.
Description
Technical field
The invention belongs to environmental technology field, be specifically related to nano zero valence iron removal Heavy Metals in Sludge method and its
Special purpose device.
Background technology
With the fast development of China's economic society, the continuous propulsion of urbanization, the amount of municipal wastewater is also increasing year by year.
Substantial amounts of sludge can be also produced while sewage is processed, and sludge is more difficult for sewage.Because containing in sludge
Have substantial amounts of pathogenic bacteria, hardly degraded organic substance, heavy metal etc., the method for disposal of current sludge mainly have burning, fill out sea, landfill,
Agricultural use etc..
Burning disposal is high-temperature heating sludge, organic matter is converted into inorganic matter.Sludge volume will reduce 60% after burning
More than, and sterilizing can be played a part of, but the equipment investment of burning and processing sludge, energy consumption, running cost are all at a relatively high, Er Qiecao
Make complicated, the problem of environmental pollutions such as waste gas, noise, heat radiation can be produced, can more seriously be produced during the method imperfect combustion
Therefore the method is also immature for raw toxic gas, there is the difficulty in economic and technical；It refers to that sludge is entered into sea to fill out sea, operation
Method is simple, expense is low, operable amount big, be not required to nontoxicization processes the advantages of can discharging, but the method is only empty
Between on any treatment is not done into sludge transfer to sludge, and have very big pollution to marine environment；Landfill have expense it is low,
Simple and easy to apply the features such as, generally used by various countries, but the method also has various problems, is such as limited by land area and easily occurred
Leachate contamination, current each state is all reducing ratio of the Sludge landfill in mud, during agricultural use in sludge
Heavy metal the water that permeates the ground, can enter enrichment in plant, animal body by agricultural entrance soil.But it is if big in removal sludge
Amount organic matter is the good living environment of plant and microorganism, there is very big agricultural value.If after Heavy Metals in Sludge being removed
Carried out by compost again it is agricultural, so will simultaneously promote urbanization and agricultural development, have good Research Prospects.
Heavy Metals in Sludge non-degradable, can produce harm and destruction ecological environment to human body by the conduction of food chain.
In agricultural sludge practice, although country gives sludge manure financial subsidies, but because sludge manure or compound fertilizer have life
State risk, can not be approved, large-scale application market mechanism cannot be set up by market always.Therefore, must before sludge landfill characteristics
Heavy Metals in Sludge must be regulated and controled, and the research that nanometer technology nowadays is applied into Treatment of Sludge is less, but nanometer skill
The probing into of heavy metal of the art in water removal, atmospheric environment is gone has reached its maturity, therefore we have reason to believe that nano zero valence iron should
There is rosy prospect for the removal of Heavy Metals in Sludge.
The content of the invention
Goal of the invention：The present invention provides the method and its special purpose device of nano zero valence iron removal Heavy Metals in Sludge, will be super
Applications of sound waves greatly reduces the reaction time in course of reaction, lifts treatment effeciency, and it is dirty effectively to remove Heavy Metals in Sludge
Dye.
Technical scheme：For achieving the above object, the present invention is adopted the following technical scheme that：
Nano zero valence iron removes the special purpose device of Heavy Metals in Sludge, including first reactor and second reactor, first
Reactor is connected via sludge pump with second reactor, and is transferred to by sludge pump through the pretreated sludge of first reactor
In two reactors；Agitator is respectively provided with the middle part of described first reactor and second reactor；In the first described reaction
The bottom of device sets ultrasonic oscillator；The magnet and heavy metal recovery for using cooperatively are provided with the bottom of described second reactor
Mouthful, second reactor is connected via another sludge pump with muddy water centrifugal separating device.
Mud mixture and nano zero valence iron are held in described first reactor, mud mixture is by being arranged on first
Sludge import on reactor enters.
Described ultrasonic oscillator is connected with the ultrasound reactor of peripheral hardware, under ultrasonic wave and agitator double action,
Mud mixture is pre-processed.
The bottom of described second reactor is back taper, and the bottom of the back taper necking is heavy metal recovery mouthful.
Magnet is provided with the inwall of the back taper of described second reactor bottom, the agitator in second reactor
In the presence of, the nano zero valence iron in mixed liquor is constantly by magnet adsorption.
Heavy Metals in Sludge method, bag are removed using the special purpose device of described nano zero valence iron removal Heavy Metals in Sludge
Include following steps：
Step 1) sludge by sludge import enter first reactor (pre-processed, according to sludge quality regulation make addition
Moisture percentage in sewage sludge is more than 90% after digestion agent, and Pretreatment Mixed Liauid is obtained after agitator and ultrasonic oscillator are pre-processed；
Wherein agitator can break up the sludge group in sludge so that digestion agent is uniformly distributed, and under ul-trasonic irradiation, promote to be tied on particle
The heavy metal of conjunction from coarse granule to fine grained and from migration from fine grained to solution；
Step 2) in first reactor, to nano zero valence iron is added in above-mentioned Pretreatment Mixed Liauid, thrown per 100g sludge
Plus the nano zero valence iron of 0.1-1g, after agitator and ultrasound reactor effect simultaneously, sludge in nano zero valence iron and mixed liquor
It is thoroughly mixed and is fully contacted, closes agitator, the mixed liquor after being processed after ultrasonic response；
Step 3) process in above-mentioned first reactor after mixed liquor be transferred in second reactor via sludge pump, the
In two reactors agitator be stirred continuously effect under by nano zero valence iron in mixed liquor constantly by magnet adsorption, by nano zero-valence
Iron is separated from the mixed liquor after treatment, and heavy metal is then also separated by nano zero valence iron absorption from sludge, nanometer
Zero-valent Iron enters heavy metal recovery mouthful；Remaining sludge then enters muddy water centrifugal separating device, dehydration via another sludge pump again
Liquid is recycled as leaching liquor afterwards；Due to the acidification of digestion agent, sludge need addition alkali neutralize, after as fertilizer agriculture
With.
Step 1) in, the supersonic frequency of described ultrasound reactor is 25-60KHz, is shaken by agitator and ultrasonic wave
The time of son pretreatment is 10-20min.
Step 2) in, the time that described agitator and ultrasound reactor are acted on simultaneously is 10-30min；Close stirring
After device, the ultrasonic response time is 1-5h.
Beneficial effect：Compared with prior art, nano zero valence iron of the invention removes the special purpose device of Heavy Metals in Sludge,
Pretreatment stage and the stage of reaction are applied to first reactor, last digestion agent separating and recovering, while reducing pollution jointly
Reduces cost；The method that nano zero valence iron of the invention removes Heavy Metals in Sludge, not only by ultrasonic applications in course of reaction,
Greatly reduce the reaction time, lift treatment effeciency, and can effectively remove Heavy Metal Pollution in Sludge, be inherently eliminated sludge
The risk problem that middle heavy metal brings, promotes sludge agricultural on a large scale, and the development of environment and agricultural is promoted while turning waste into wealth.
Brief description of the drawings
Fig. 1 is the structural representation that nano zero valence iron removes Heavy Metals in Sludge special purpose device.
Specific embodiment
The present invention is further described with reference to embodiment.
As shown in figure 1, nano zero valence iron removes the special purpose device of Heavy Metals in Sludge, including first reactor 11 and second
Reactor 12, holds mud mixture 4 and nano zero valence iron 7 in first reactor 11, and mud mixture 4 is by being arranged on first
The sludge import 1 of reactor 11 enters, and agitator 5 is set at the middle part of first reactor 11, for stirring mud mixture 4,
Ultrasonic oscillator 2 is set in the bottom of first reactor 11, ultrasonic oscillator 2 is connected with the ultrasound reactor 3 of peripheral hardware, super
Under sound wave and agitator double action, mud mixture 4 is pre-processed.
First reactor 11 is connected via sludge pump 6 with second reactor 12, pretreated through first reactor 11
Sludge is transferred in second reactor 12 by sludge pump 6, and agitator 5, second reactor are set at the middle part of second reactor 12
12 bottom is back taper, and the bottom of the back taper necking is heavy metal recovery mouthful 9, in the back taper of the bottom of second reactor 12
Inwall be provided with magnet 8, in the presence of agitator 5, the nano zero valence iron 7 in mixed liquor is constantly by magnetic for second reactor 12
Iron 8 is adsorbed, and second reactor 12 is connected via another sludge pump 6 with muddy water centrifugal separating device 10.
The method that nano zero valence iron removes Heavy Metals in Sludge, comprises the following steps：
Step 1) sludge pre-processed by sludge import 1 into first reactor 11, made according to sludge quality regulation plus
Enter the hydrochloric acid solution of digestion agent 2%, rear moisture percentage in sewage sludge is more than 90%, and 10- is pre-processed by agitator 5 and ultrasonic oscillator 2
20min obtains Pretreatment Mixed Liauid；The supersonic frequency of ultrasound reactor 3 is that between 25-60KHz, wherein agitator 5 can be beaten
Dissipate the sludge group in sludge so that digestion agent is uniformly distributed, and under ul-trasonic irradiation, promotes the heavy metal combined on particle by thick
Particle to fine grained and from migration from fine grained to solution；
Step 2) in first reactor 11, to nano zero valence iron 7 is added in above-mentioned Pretreatment Mixed Liauid, per 100g sludge
The nano zero valence iron 7 of 0.1-1g is added, after stirring and ultrasonic wave act on 10-30min simultaneously, in nano zero valence iron 7 and mixed liquor
Sludge is thoroughly mixed and is fully contacted, and closes agitator 5, the mixed liquor after being processed after ultrasonic response 1-5h；
Step 3) process in above-mentioned first reactor 11 after mixed liquor be transferred to second reactor 12 via sludge pump 6
Interior, nano zero valence iron 7 is constantly inhaled by magnet 8 in being stirred continuously under effect by mixed liquor of agitator 5 in the second reactor 12
It is attached, nano zero valence iron 7 can now be separated from the mixed liquor after treatment, and heavy metal is then inhaled by nano zero valence iron 7
Attached also to be separated from sludge, nano zero valence iron 7 enters heavy metal recovery mouthful 9, and sludge then enters via another sludge pump 6 again
Muddy water centrifugal separating device 10, liquid can be recycled as leaching liquor after dehydration；Due to the acidification of digestion agent, sludge
Need addition alkali neutralize, after it is agricultural as fertilizer.
Can be according to the yield of sludge of sewage treatment plant come reactor design size and the dosage of nano zero valence iron 7.This
Device about 2.5h is a cycle of operation, while this device has can be used with continuous service, sludge sample introduction can use electricity
The advantages of brain operation, reduction workman's workload.
Application example 1
Sludge of sewage treatment plant 36Kg is taken, its moisture content is about 82% or so, be divided into 12 parts of every part of 3Kg, 12 parts are divided into 4 groups
Every group 3 parts, the hydrochloric acid solution that 800ml digestion agents are 2% hydrochloric acid is all added respectively.Located in advance by agitator 5 and ultrasonic oscillator 2
Reason 10min obtains Pretreatment Mixed Liauid；The supersonic frequency of ultrasound reactor 3 is, in 30KHz, 7 nano zero-valences all to be added respectively
Simultaneously after action-reaction 20min, nano zero valence iron 7 is thoroughly mixed with sludge in mixed liquor and fully connects for iron 10g, stirring and ultrasonic wave
Touch, close agitator 5, ultrasonic response each group respectively reaction 1,2,3, processed after 5h after mixed liquor, determining to weigh
The yield of metal increases larger after 1,2h, and the heavy metal recovery amount of 3h and 5h and 2h heavy metal recoveries amount keep not substantially
Become.Can then draw in 2 hours best results of process time.Continuation reaction effect substantially and does not consume energy larger.
The above is only the preferred embodiment of the present invention, it should be pointed out that：Come for those skilled in the art
Say, under the premise without departing from the principles of the invention, can also make some improvements and modifications, these improvements and modifications also should be regarded as
Protection scope of the present invention.
Claims (8)
1. nano zero valence iron removes the special purpose device of Heavy Metals in Sludge, it is characterised in that：Including first reactor (11) and
Two reactors (12), first reactor (11) is connected via sludge pump (6) with second reactor (12), through first reactor
(11) pretreated sludge is transferred in second reactor (12) by sludge pump (6)；In described first reactor (11) and
Agitator (5) is respectively provided with the middle part of second reactor (12)；Ultrasonic wave is set in the bottom of described first reactor (11) to shake
Sub (2)；The magnet (8) and heavy metal recovery mouthful (9) for using cooperatively, second are provided with the bottom of described second reactor (12)
Reactor (12) is connected via another sludge pump (6) with muddy water centrifugal separating device (10).
2. nano zero valence iron according to claim 1 removes the special purpose device of Heavy Metals in Sludge, it is characterised in that：Institute
Mud mixture (4) and nano zero valence iron (7) are held in the first reactor (11) stated, mud mixture (4) is by being arranged on
Sludge import (1) on one reactor (11) enters.
3. nano zero valence iron according to claim 1 removes the special purpose device of Heavy Metals in Sludge, it is characterised in that：It is described
Ultrasonic oscillator (2) be connected with the ultrasound reactor (3) of peripheral hardware, under ultrasonic wave and agitator double action, to muddy water
Mixture (4) is pre-processed.
4. nano zero valence iron according to claim 1 removes the special purpose device of Heavy Metals in Sludge, it is characterised in that：It is described
The bottom of second reactor (12) be back taper, the bottom of the back taper necking is heavy metal recovery mouthful (9).
5. nano zero valence iron according to claim 4 removes the special purpose device of Heavy Metals in Sludge, it is characterised in that：Institute
The inwall of the back taper of second reactor (12) bottom stated is provided with magnet (8), the agitator in second reactor (12)
(5) in the presence of, the nano zero valence iron (7) in mixed liquor is constantly adsorbed by magnet (8).
6. using the special purpose device removal of the nano zero valence iron removal Heavy Metals in Sludge described in any one in claim 1-5
Heavy Metals in Sludge method, it is characterised in that comprise the following steps：
Step 1) sludge by sludge import (1) enter first reactor (11) pre-processed, according to sludge quality regulation make plus
Moisture percentage in sewage sludge is 90% after entering digestion agent, and pretreatment mixing is obtained after agitator (5) and ultrasonic oscillator (2) are pre-processed
Liquid；
Step 2) in first reactor (11), to nano zero valence iron (7) is added in above-mentioned Pretreatment Mixed Liauid, per 100g sludge
After the nano zero valence iron (7) of 0.1-1g, agitator (5) and ultrasound reactor (3) are added while acting on, nano zero valence iron (7)
It is thoroughly mixed with sludge in mixed liquor and is fully contacted, closes agitator (5), the mixed liquor after being processed after ultrasonic response；
Step 3) mixed liquor in above-mentioned first reactor (11) after treatment is transferred to second reactor (12) via sludge pump (6)
It is interior, second reactor (12) interior agitator (5) be stirred continuously effect under by mixed liquor in nano zero valence iron (7) constantly by magnetic
Iron (8) is adsorbed, and nano zero valence iron (7) is separated from the mixed liquor after treatment, and heavy metal is then inhaled by nano zero valence iron (7)
Attached also to be separated from sludge, nano zero valence iron (7) enters heavy metal recovery mouthful (9)；Remaining sludge is then again via another
Sludge pump (6) enters muddy water centrifugal separating device (10), and liquid is recycled as leaching liquor after dehydration；Due to the acid of digestion agent
Change act on, sludge need addition alkali neutralize, after it is agricultural as fertilizer.
7. the method that nano zero valence iron according to claim 6 removes Heavy Metals in Sludge, it is characterised in that：Step 1)
In, the supersonic frequency of described ultrasound reactor (3) is 25-60KHz, is located in advance by agitator (5) and ultrasonic oscillator (2)
The time of reason is 10-20min.
8. the method that nano zero valence iron according to claim 6 removes Heavy Metals in Sludge, it is characterised in that：Step 2)
In, described agitator (5) and ultrasound reactor (3) is while the time of effect is 10-30min；After closing agitator (5),
The ultrasonic response time is 1-5h.
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| CN201611076727.3A CN106746395A (en) | 2016-11-30 | 2016-11-30 | The method and its special purpose device of nano zero valence iron removal Heavy Metals in Sludge |
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| CN201611076727.3A CN106746395A (en) | 2016-11-30 | 2016-11-30 | The method and its special purpose device of nano zero valence iron removal Heavy Metals in Sludge |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101811133A (en) * | 2010-04-27 | 2010-08-25 | 河海大学 | Ultrasonic remediating method for heavy metal polluted soil/slurry |
| CN102380505A (en) * | 2011-08-08 | 2012-03-21 | 同济大学 | Method for repairing heavy metal-polluted soil or sludge with nano-zero-valent iron (nZVI) |
| KR20120076131A (en) * | 2010-12-29 | 2012-07-09 | 한국과학기술연구원 | Complex of graphene-iron oxide and the fabrication method thereof |
| CN102951749A (en) * | 2012-11-12 | 2013-03-06 | 同济大学 | Method and device for removing heavy metals in industrial wastewater by nanoscale zero-valent iron-multilevel reversed filter type system |
| CN103894396A (en) * | 2014-03-24 | 2014-07-02 | 华南理工大学 | Method for treating heavy metal contaminated soil |
| CN104607452A (en) * | 2015-01-21 | 2015-05-13 | 浙江农林大学 | Method for ultrasonically repairing heavy metal contaminated soil |
-
2016
- 2016-11-30 CN CN201611076727.3A patent/CN106746395A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101811133A (en) * | 2010-04-27 | 2010-08-25 | 河海大学 | Ultrasonic remediating method for heavy metal polluted soil/slurry |
| KR20120076131A (en) * | 2010-12-29 | 2012-07-09 | 한국과학기술연구원 | Complex of graphene-iron oxide and the fabrication method thereof |
| CN102380505A (en) * | 2011-08-08 | 2012-03-21 | 同济大学 | Method for repairing heavy metal-polluted soil or sludge with nano-zero-valent iron (nZVI) |
| CN102951749A (en) * | 2012-11-12 | 2013-03-06 | 同济大学 | Method and device for removing heavy metals in industrial wastewater by nanoscale zero-valent iron-multilevel reversed filter type system |
| CN103894396A (en) * | 2014-03-24 | 2014-07-02 | 华南理工大学 | Method for treating heavy metal contaminated soil |
| CN104607452A (en) * | 2015-01-21 | 2015-05-13 | 浙江农林大学 | Method for ultrasonically repairing heavy metal contaminated soil |
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