CN105693065B - A kind of method of municipal sludge deep dehydration - Google Patents
A kind of method of municipal sludge deep dehydration Download PDFInfo
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- CN105693065B CN105693065B CN201610135493.9A CN201610135493A CN105693065B CN 105693065 B CN105693065 B CN 105693065B CN 201610135493 A CN201610135493 A CN 201610135493A CN 105693065 B CN105693065 B CN 105693065B
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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
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
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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
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/14—Treatment of sludge; Devices therefor by de-watering, drying or thickening with addition of chemical agents
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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
- C02F2303/00—Specific treatment goals
- C02F2303/06—Sludge reduction, e.g. by lysis
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- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
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- General Chemical & Material Sciences (AREA)
- Treatment Of Sludge (AREA)
Abstract
The invention belongs to technical field of sludge treatment, and in particular to a kind of method of municipal sludge deep dehydration.The method comprising the steps of: the solid content of dewatered sludge is adjusted to 1%~4%；Ferric chloride solution is added, adjusts the pH of sludge；Ferrous sulfate solution is added and hydrogen peroxide solution carries out Fenton's reaction.This method not only can effectively improve dewatering performance of sludge, but also unobvious increase sludge dry matter, not change sludge quality, but also not interfere the sludge conditioning method of the subsequent disposition of sludge and resource utilization.
Description
Technical field
The invention belongs to technical field of sludge treatment, and in particular to a kind of method of municipal sludge deep dehydration.
Background technique
Municipal sludge is the by-product of municipal wastewater processing.Since the establishment of the nation with Chinese society and economic rapid development,
The sewage disposal cause in China has also obtained tremendous development.Ended for the end of the year 2014, China city, county add up to build up at town sewage
3717, factory is managed, sewage treatment capacity reaches 1.57 hundred million m3/ day, corresponding municipal sludge yield is up to 7,000,000 dry tons/year
(based on activated sludge).Not only the content of organic matter is high for municipal sludge, but also contains the nutrition such as N, P, K needed for plant growth
Ingredient.Certainly, there is also pathogen, parasitic ovum, heavy metal and certain poisonous and harmful hardly degraded organic substances etc. in sludge.Cause
This, after entering environment without the sludge that suitable treatments are disposed, it will secondary pollution is brought directly to water body and atmosphere, to ecology
The activity of environment and the mankind will also constitute serious threat.The method of disposal of sludge mainly includes landfill, system fertilizer, burning and building materials
Etc. main paths.However, dewatered sludge high-moisture percentage is always to restrict an important factor for municipal sludge is rationally disposed.
Currently, sewage treatment plant uses belt after generalling use cationic polyacrylamide (CPAM) conditioning to thickened sludge
Filters pressing or centrifugal machine dehydration.However, the moisture content of dewatered sludge is still up to 80% or so.High moisture percentage in sewage sludge not only increases
Add sludge transportation cost, but also sludge subsequent processing disposition difficulty increases.Therefore, (moisture content is reduced to deeply dehydrating sludge
It 60% or less) is the key that carry out sludge effectively to dispose.
Common sludge conditioning technology has the physical methods such as heat conditioning, freeze thawing conditioning, ultrasound conditioning and microwave conditioning；It is inorganic
The biological modulateds such as the chemical conditioning methods such as chemical agent, organic chemicals, electrochemistry and sludge anaerobic, aerobic sigestion processing
Reason method.Sludge physics Opsonizing method is built upon on high energy consumption basis, and expensive operating cost limits such side
The engineering of method is promoted.Sludge is cooperated using molysite, aluminium salt and lime or flyash, although dewatered sludge moisture content can be made to drop
Down to 60%, however conditioner dosage is but up to the 30-50% of sludge dry matter, so that sludge dry matter " increase-volume ", Jin Erzeng
Add subsequent sludge treatment cost.Sludge is using other inorganic, organic medicaments and electrochemistry sides such as ozone, acid, alkali, polyacrylamides
Method conditioning can not be in engineering although can show the effect of raising dewatering performance of sludge in laboratory research
Deeply dehydrating sludge is realized on application.In addition, the influence of sludge anaerobic, aerobic sigestion operating parameter to dewatering performance of sludge
Also unapparent.
Summary of the invention
It is the key that realize sludge high-efficiency dehydration that sludge, which effectively improves,.Chemical conditioning method is with speed is fast, effect is good, work
The advantages that journey is practical.In order to make up the deficiency of existing chemical method, the present invention provides a kind of municipal sludge deep dehydrations
Method.This method not only can effectively improve dewatering performance of sludge, but also unobvious increase sludge dry matter, not change sludge
Matter, but also the sludge conditioning method of the subsequent disposition of sludge and resource utilization is not interfered.
A kind of method of municipal sludge deep dehydration, includes the following steps:
1) it is 1%~4% that the dewatered sludge by solid content higher than 4%, which is diluted to solid content, alternatively, directly using solid content
For 1%~4% thickened sludge.
Dewatered sludge in step 1) can be selected from sewage treatment plant's belt type dewaterer or the dewatered sludge of centrifugal dehydrator.
2) ferric chloride solution is added in the sludge for being 1%~4% to solid content, quickly stirs 5min~20min, it is sufficiently mixed
It is even.
In step 2), the amount of dry matter of the ferric chloride solution of addition is less than or equal to the 7% of sludge amount of dry matter, quickly stirs
Mixing speed be 180~300rpm.
3) ferrous sulfate solution is added into the sludge after step 2) processing, quickly stirs 5min~20min, fills
Divide and mixes.
In step 3), the amount of dry matter of the ferrous sulfate solution of addition is the 5%~12% of sludge amount of dry matter, is quickly stirred
The mixing speed mixed is 180~300rpm.
4) hydrogen peroxide solution that concentration is 30% is added into the sludge after step 3) processing, quickly stirs 5min
~10min sufficiently reacts, then mixes slowly 5min~10min.
In step 4), the quality of 30% hydrogen peroxide solution of addition is the dry of the ferrous sulfate solution being added in step 3)
The 30%~60% of amount of substance, the mixing speed quickly stirred be 180~300rpm, the mixing speed mixed slowly be 50~
100rpm。
Working principle of the present invention is as follows:
Using above-mentioned sludge conditioning method of the invention, FeCl3The pH value that sludge can be pre-adjusted after addition, to have
Conducive to next step FeSO4And H2O2The generation of Fenton's reaction after addition.The strong oxidizer hydroxyl radical free radical .OH that Fenton's reaction generates
Can effective breaking sludge wadding body surface Extracellular polymers EPS, and then destroy the flocculation structure of sludge, make in sludge more
It is converted into readily removed Free water in conjunction with water, therefore can also be obviously improved the dewatering of sludge.In addition, sludge colloid band
Negative electrical charge, the ferric ion that the ferric ion and subsequent Fenton's reaction being added by iron chloride generate can be adsorbed onto dirt
Mud surface can both play absorption charge neutrality, reduce sludge colloid surface charge effect, can also reduce or eliminate sludge colloid
Zeta potential, be effectively compressed electric double layer, so that the repulsive force between particle be made to decline, make sludge it is de- it is steady be easy to happen with cohesion,
To improve the dewatering of sludge.
In addition, ferric ion is because charge is high and ionic radius is small, the hydrone being coordinated therewith is induced by electrophilic
Effect, acidity enhancing are easy to dissociate proton, and further dehydrating polycondensation forms the Hydroxide-Oxides hydration of Fe-O-Fe
Object colloid.So ferric iron is easy to hydrolyze to form positively charged ferric hydroxide precipitate, in the environment of pH > 4 so as to inhale
Attached, net catches negatively charged colloidal coagulation, and then improves the dewatering of sludge.
Detailed description of the invention
Fig. 1 is the process flow chart of the method for municipal sludge deep dehydration provided by the present invention.
Specific embodiment
The principles and features of the present invention are described below, and the given examples are served only to explain the present invention, is not intended to limit
Determine the scope of the present invention.
Embodiment 1
It is 2% that certain sewage treatment plant, which is diluted to solid content by the sludge (solid content 13%) after PAM flocculation dewatering,
Sludge, then take 50mL to carry out sludge specific resistance test using Bu Shi pan-vacuum filtration method, record filters the time.Because all
It is that the sludge of same batch is tested, so the variation of dewatering before and after sludge conditioning can be characterized by filtering the time.
Separately taking 100mL solid content is 2% sludge, adds the FeCl of 0.037g thereto3 .6H2O is quickly stirred, sufficiently
Dissolution mixes；Again plus the FeSO of 0.2g4 .7H2O, quickly stirring, sufficiently dissolution mix；Again plus the H of 0.08mL2O2(concentration 30%,
Similarly hereinafter), first quickly stirring, mixes well, then mix slowly.Then 50mL is taken to carry out using Bu Shi pan-vacuum filtration method dirty
The test of mud resistivity, record filter the time.
Test result shows that it is 6.74 that non-dosing, which carries out the modified sludge pH of conditioning, in the case where vacuum degree is 0.092MPa,
It is very slow to filter speed, when the suction filtration time reaches 5 minutes, still with the presence of large quantity of moisture in funnel, filtrate volume also only has 22mL.
And the sludge (pH value 5.67) after dosing improves, at 0.086MPa, it is only necessary to obtain within 30 seconds cracking mud cake, and medicine
The additional amount of agent is the 16% of sludge dry matter, is controlled within 20%.
Thus illustrating, this method can not only be obviously improved the dewatering of sludge, realize the deep dehydration of sludge, and
The also unobvious volume for increasing dehydrated sludge cake, to be conducive to subsequent transport and processing disposition.
Embodiment 2
PH value is 6.67, and the thickened sludge for certain sewage treatment plant that solid content is 1.6% takes in the case where not dosing
50mL is filtered using Bu Shi pan-vacuum filtration method, vacuum degree 0.096MPa, does not obtain cracking mud cake when filtering 10 minutes,
Filtrate volume is 43mL.
The FeSO of 0.2g is added into the 100mL thickened sludge4.7H2O, quickly stirring, sufficiently dissolution mix；Again plus
The H of 0.08mL2O2, first quickly stirring, mixes well, then mix slowly.50mL is taken to filter using Bu Shi pan-vacuum filtration method,
In the case where vacuum degree is 0.094MPa, it is only necessary to which 1 point can be obtained cracking mud cake in 30 seconds.
The 100mL thickened sludge separately is taken, adds the FeCl of 0.04g thereto3.6H2O, quickly stirring, sufficiently dissolution mix；
Again plus the FeSO of 0.2g4.7H2O, quickly stirring, sufficiently dissolution mix；Again plus the H of 0.08mL2O2, first quickly stirring, sufficiently mixed
It is even, then mix slowly.Then it takes 50mL to be filtered using Bu Shi pan-vacuum filtration method, is 0.094MPa's in vacuum degree
In the case of, the time of mud cake cracking further shortens to 55 seconds.
It can be seen that can significantly improve the dewatering of sludge in the case of the addition of 2 kinds of medicaments, and chemical agent adds
Also all control is acceptable range in Practical Project within the 20% of sludge dry matter to dosage.
Embodiment 3
It is 3% that certain sewage treatment plant, which is diluted to solid content by the sludge (solid content 10%) after PAM flocculation dewatering,
Sludge, then take 50mL to be filtered using Bu Shi pan-vacuum filtration method, vacuum degree 0.09MPa, when filtering 10 minutes
Cracking mud cake, filtrate volume 30mL are not obtained.
The FeCl of 0.059g is added into the 100mL thickened sludge3.6H2O, quickly stirring, sufficiently dissolution mix；Again plus
The FeSO of 0.35g4.7H2O, quickly stirring, sufficiently dissolution mix；Again plus the H of 0.14mL2O2, first quickly stirring, mixes well,
It mixes slowly again.Then 50mL is taken to be filtered using Bu Shi pan-vacuum filtration method, the case where vacuum degree is 0.098MPa
Under, filtering 1 point can be obtained cracking mud cake in 33 seconds, illustrate to significantly improve dewatering performance of sludge.
Beneficial effect
When the present invention carries out deeply dehydrating sludge for existing chemical conditioning method, conditioner dosage is big, hence it is evident that increases dirty
Mud amount of dry matter, and then the status of sludge subsequent processing disposition is influenced, providing one kind both can effectively improve dewatering performance of sludge,
The unobvious sludge conditioning method (being shown in Table 1) for increasing dehydrated sludge dry matter of energy again, and it is easy to operate, securely and reliably, cost
It is cheap, therefore can be used for dehydrating municipal sludge, and dewatered sludge quality is there is no substantially changeing, therefore can be with resource
Change and utilize, such as building materials, compost.
Influence of 1 chemical agent of table to dewatering performance of sludge
From above table as can be seen that being handled with dewatering provided by the present invention, the conditioner of addition is done
The amount of substance can control within 20%；And down to 15% or so, this method remains to reach good dewatering performance of sludge；
Later period vacuum filtration is efficient；The mud cake cracking time is greatly shortened.Above each performance, is significantly better than that related art.
The foregoing is merely better embodiments of the invention, are not intended to limit the invention, all in spirit of the invention
Within principle, any modification, equivalent replacement, improvement and so on be should all be included in the protection scope of the present invention.
Claims (6)
1. a kind of method of municipal sludge deep dehydration, which comprises the steps of:
1) it is 1%~4% that the dewatered sludge by solid content higher than 4%, which is diluted to solid content, alternatively, being directly using solid content
1%~4% thickened sludge；
2) ferric chloride solution is added in the sludge for being 1%~4% to solid content, quickly stirs 5min~20min, mixes well,
The amount of dry matter of the ferric chloride solution of addition is less than or equal to the 7% of sludge amount of dry matter；
3) ferrous sulfate solution is added into the sludge after step 2) processing, quickly stirs 5min~20min, it is sufficiently mixed
It is even；
4) hydrogen peroxide solution is added into the sludge after step 3) processing, quickly stirs 5min~10min, it is sufficiently anti-
It answers, then mixes slowly 5min~10min.
2. the method for municipal sludge deep dehydration according to claim 1, it is characterised in that: in step 3), the sulphur of addition
The amount of dry matter of sour ferrous iron solution is the 5%~12% of sludge amount of dry matter.
3. the method for municipal sludge deep dehydration according to claim 2, it is characterised in that: in step 4), pair of addition
The quality of hydrogen peroxide in oxygen aqueous solution is the 30%~60% of the amount of dry matter for the ferrous sulfate solution being added in step 3).
4. the method for municipal sludge deep dehydration according to any one of claims 1 to 3, it is characterised in that: in step 2)
The mixing speed quickly stirred is 180~300rpm.
5. the method for municipal sludge deep dehydration according to any one of claims 1 to 3, it is characterised in that: in step 3)
The mixing speed quickly stirred is 180~300rpm.
6. the method for municipal sludge deep dehydration according to any one of claims 1 to 3, it is characterised in that: in step 4)
The mixing speed quickly stirred is 180~300rpm；The mixing speed mixed slowly in step 4) is 50~100rpm.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
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| CN201510465222 | 2015-07-31 | ||
| CN2015104652225 | 2015-07-31 |
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| Publication Number | Publication Date |
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| CN105693065A CN105693065A (en) | 2016-06-22 |
| CN105693065B true CN105693065B (en) | 2019-03-19 |
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| CN201610135493.9A Active CN105693065B (en) | 2015-07-31 | 2016-03-10 | A kind of method of municipal sludge deep dehydration |
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| CN108002599B (en) * | 2018-01-10 | 2024-01-05 | 北京京城环保股份有限公司 | Solid-liquid separation method and device for multi-material anaerobic fermentation liquid containing kitchen waste |
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|---|---|---|---|---|
| WO2002004359A1 (en) * | 2000-07-07 | 2002-01-17 | Microbar, Inc. | Method of treating industrial waste waters |
| CN1986788A (en) * | 2006-12-12 | 2007-06-27 | 广州铬德工程有限公司 | Sludge dewatering chemical amendment and its dewatering method |
| CN102408178A (en) * | 2010-09-21 | 2012-04-11 | 上海市政工程设计研究总院 | Deep dewatering method for sludge |
| CN102603152A (en) * | 2012-03-08 | 2012-07-25 | 佛山市环保技术与装备研发专业中心 | Sludge deep dehydration conditioning agent and application thereof |
| CN104788007A (en) * | 2015-04-29 | 2015-07-22 | 北京同创碧源水务科技发展有限公司 | Deep dehydration method of sludge after domestic sewage treatment |
-
2016
- 2016-03-10 CN CN201610135493.9A patent/CN105693065B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2002004359A1 (en) * | 2000-07-07 | 2002-01-17 | Microbar, Inc. | Method of treating industrial waste waters |
| CN1986788A (en) * | 2006-12-12 | 2007-06-27 | 广州铬德工程有限公司 | Sludge dewatering chemical amendment and its dewatering method |
| CN102408178A (en) * | 2010-09-21 | 2012-04-11 | 上海市政工程设计研究总院 | Deep dewatering method for sludge |
| CN102603152A (en) * | 2012-03-08 | 2012-07-25 | 佛山市环保技术与装备研发专业中心 | Sludge deep dehydration conditioning agent and application thereof |
| CN104788007A (en) * | 2015-04-29 | 2015-07-22 | 北京同创碧源水务科技发展有限公司 | Deep dehydration method of sludge after domestic sewage treatment |
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