CN105417928B - A method of using Fenton sludge to municipal sludge dehydrated in situ - Google Patents
A method of using Fenton sludge to municipal sludge dehydrated in situ Download PDFInfo
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- CN105417928B CN105417928B CN201511016687.9A CN201511016687A CN105417928B CN 105417928 B CN105417928 B CN 105417928B CN 201511016687 A CN201511016687 A CN 201511016687A CN 105417928 B CN105417928 B CN 105417928B
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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
- 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
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/004—Sludge detoxification
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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
- C02F2303/02—Odour removal or prevention of malodour
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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
- C02F2303/04—Disinfection
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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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- Treatment Of Sludge (AREA)
Abstract
The present invention relates to a kind of using Fenton sludge to the method for municipal sludge dehydrated in situ.The present invention is added sulfuric acid activated by sludge by sewage treatment plant's filters pressing and after being dehydrated, it is present in ferro element in sludge with ionic forms, plastic draining board is squeezed into municipal sludge field carries out dehydration pre-process, moisture is discharged using conventional vacuum prepressing water discharge method, it is stirred evenly being added in pretreated municipal sludge with the Fenton sludge of sulfuric acid activated mistake, add quick lime, it is stirred, it is uniformly mixed sludge rapidly with calcium oxide, pH, deodorization and disinfection are adjusted, deep dehydration and stabilized purpose are reached.The present invention overcomes the high defects of the operation of previous Treatment of Sludge and cost of disposal.Coagulant of the present invention using the product of Fenton oxidation method containing the sludge of a large amount of ferro elements as municipal sludge curing process contains a large amount of Fe after activation3+Ion, high price molysite can be used as leaching agent and leach the heavy metal ion in sludge, and sludge is discharged.
Description
Technical field
The invention belongs to protection of natural resources and environment technical fields more particularly to a kind of utilization Fenton sludge to municipal sludge original
The method of position dehydration.
Background technique
Currently, the whole nation is accumulative to build up urban wastewater treatment firm 3622, sewage treatment capacity reaches 1.53 hundred million m3/d.By
2015, whole nation whole year urban wastewater treatment firm wet mud (moisture content 80%) yield was up to 33,590,000 t.Very due to China
There is the phenomenon that " the light mud of heavy water " in the planning and designing of more sewage treatment plants, do not catch up with much to the capital investment of specific resistance to filtration
Capital investment to sewage treatment, the sludge of thousands of tons cannot usually be dealt carefully with, and which results in illegally steal blowdown mud
Case emerge one after another throughout the country.
The status of China's sludge from wastewater treatment plant disposition is that have quite a few sludge not through overstabilization, harmless
Change processing, is just discharged in farmland, forest land and lake river by stealing by all kinds of means, untreated sludge has the growth of plant
Certain inhibiting effect, will lead to Plant death when serious, cause serious short-term environmental hazard and long-term potential risk.To steathily
For blowdown mud, as its concealment caused by endanger bigger, processing difficulty is also bigger.Sludge arbitrarily discharges, spontaneous fermentation
Stench is generated, polluted source influences air quality, increases the probability of happening of extensive infectious disease, seriously affects the life of the mankind
Health.Simultaneously as its moisture content is generally 80% or so when sludge transports sewage treatment plant, sludge is let out during transportation
Dew can impact road and surrounding enviroment.Some sewage treatment plants are by sludge treatment outsourcing, regardless of contractor has not
There is related qualification, as long as sludge can be pulled away, how to dispose and have no tracking supervision.The event of falling sludge takes place frequently steathily, topples over sludge
Point surrounding enviroment cause seriously to pollute, and influence the life of local resident, and cause huge economic losses.If this kind of event obtains not
To containment, then the wastewater treatment efficiency of high standard is also only made a futile effort for environmental protection again.
Before proposing mark transformation, most Industrial Waste Water Treatments factory carries out waste water using traditional Fenton (Fenton) oxidizing process
Advanced treating, but Fenton oxidation method can generate a certain amount of chemical sludge during processing, if improper conduct oneself well comprehends production
Raw harm, such as: occupy a large amount of soils；Sludge, which is stacked, can generate high temperature or other chemical reactions, meeting by wind and weather
Destroy the structure of soil；Direct emission swims product riverbed, serious polluted-water；Sludge releases nocuousness after being decomposed by microbiological oxidation
Gas, dust etc. can aggravate the pollution of atmosphere.
Before the present invention makes, China's Treatment of Sludge is generally in the starting stage, lacks mature processing route, does not have
It can fundamentally solve the problems, such as that sewage sludge harmlessness is handled.The operation of Treatment of Sludge and cost of disposal are high, and to Treatment of Sludge
Understanding is insufficient and the missing of relevant policies, seriously constrains the development of Treatment of Sludge.
Containing many useful substances in sludge, such as: phosphorus rich in sludge can recycle sludge with bronsted lowry acids and bases bronsted lowry
In phosphorus.Fenton oxidation method handles sewage and coagulation for wastewater treatment sedimentation basin bed mud and generally all contains more iron hydroxide
The presence of sediment, iron hydroxide often brings difficulty to sludge dewatering.A certain amount of containing being added in molysite deposition sludge
Acid reduces the pH value of sludge, and the oxygen iron oxide in sludge can be dissolved in water at this time.It can be returned with the methods of acidification, alkalization
Receive the coagulant in sludge.
The recycling treatment of sludge is only optimal processing method, and main flow direction is exactly minimizing, innoxious, stabilisation
Processing.How properly to dispose sewage plant treated sludge, especially quite a few sludge thrown aside, and become give up into
It is precious, it has also become sewage plant and relevant departments improve technical level and an important factor for management level, and the whole world is paid close attention to jointly
Project.
Summary of the invention
The object of the invention is that overcoming drawbacks described above, develop a kind of de- in situ to municipal sludge using Fenton sludge
The method of water.
The technical solution of the present invention is as follows:
A method of using Fenton mud to municipal sludge dehydrated in situ, major technique is that steps are as follows: (1) will
The sludge containing a large amount of ferro elements generated after Fenton oxidation advanced treatment of industrial wastewater is after sewage treatment plant's filters pressing, then passes through
After natural air drying or mechanical dehydration, addition is sulfuric acid activated, is present in ferro element therein in sludge with ionic forms；
(2) plastic draining board is squeezed into the municipal sludge field largely stacked, and dehydration pre-process, drop are carried out to municipal sludge
The moisture generated in following step is discharged using conventional vacuum prepressing water discharge method, makes the preparatory minimizing of municipal sludge and stabilisation:
(3) it will be added in pretreated municipal sludge with the Fenton sludge of sulfuric acid activated mistake, stirring keeps its mixing equal
Even, principle is to form positive charge after being hydrated it, to neutralize the negative electrical charge of mud granule, is allowed to depth and flocculates, in sludge
Divalent carbonate also can be with Fe3+Iron hydroxide is formed, flocculation is provided；
(4) quick lime is added, is stirred using twin shaft multiple-blade agitating device, mixes sludge rapidly with calcium oxide
It is even, it is therefore an objective to adjust pH, deodorization and disinfection, furthermore can enhance grain structure, gap is provided, reduce the compressibility of sludge, generate
Heat partial moisture can also be evaporated, reach deep dehydration and stabilized purpose.
The Fenton sludge is the chemical sludge that sewage treatment plant uses Fenton oxidation method advanced treating to generate,
Contained heavy metal concentration is respectively less than the requirement in GB4284-84.
In the step (1), Fenton moisture percentage in sewage sludge used is 75%~85%, through natural air drying or mechanical dehydration
Solid content is greater than 40% afterwards, and sulfuric acid activated, sulfuric acid dosage H in molar ratio is added2SO4: Fe=0.25~1: 1, preferably
H2SO4: Fe=0.5: 1.
In the step (2), municipal sludge moisture content used is 75%~85%, since surface water effect contains after stacking
It is 78%~90% that water, which increases, and preferred water content is 78%~85%.
In the step (3), by vacuum method of drainage be discharged waste water returned after simple process municipal sewage plant into
Row processing.
In the step (4), agitating mode may be selected mechanical stirring or manually turn over mixed mode, the Fenton sludge added
Mass ratio with municipal sludge is 1: 5~20, and in mixed sludge, the mass content of ferro element is between 1%~4%, instead
It is not less than 4 hours between seasonable；The mass ratio of Fenton sludge and municipal sludge is preferably 1: 15, and the reaction time is preferably 24 small
When.
In the step (4), quick lime dosage is added with 10%~40% of wet mud quality in step (3),
Curing time is not less than 2 days.The preferred dosage of quick lime is 20%；The curing time of sludge is preferably 7 days.
The utility model has the advantages that the present invention has the advantage that compared with existing sludge disposal method
1, the present invention uses the product of Fenton oxidation method containing the sludge of a large amount of ferro elements as municipal sludge curing process
Coagulant, activation after contain a large amount of Fe3+Ion, high price molysite can be used as leaching agent for the heavy metal ion in sludge
It leaches, the heavy metal in sludge after removing is stable, while iron hydroxide can be formed with the divalent carbonate in sludge, to sludge
With flocculation, efficient removal moisture therein；
2, the present invention uses Fenton sludge and municipal sludge cooperative disposal, can carry out simultaneously to two kinds of intractable sludge
Stabilization processes, Fenton sludge inherently solid waste, can achieve the purpose of the treatment of wastes with processes of wastes against one another；
3, the present invention is using Fenton sludge and lime as curing materials, and from a wealth of sources, processing cost is low, has good
Operability, economic benefit and environmental benefit；
4, sludge in-situ disposition recovery technique avoids different without carrying out excavation transport to the sludge place that large area is thrown aside
The generation of the pollution problems such as foul smell and leakage when the disposition of position；
5, treated, and sludge place is not necessarily to ted maintenance, and internal intensity can be gradually increased, and inside and outside is in loess state, nothing
Stink, meet water impregnate will not argillization, there is preferable geotechnological performance, can sufficiently meet the geotechnological intensity of landfill or general backfill
It is required that also can be used as the gasket material of light ceramic and roadbed aggregate and underground piping；
6, there is good stabilization to heavy metal pollutant, the heavy metal in treated sludge is mostly with stable state
In the presence of top can carry out second ploughing and restoration of the ecosystem, be reduced to land use for greening.
Specific embodiment
What the Fenton sludge used generated after using Fenton oxidation method advanced treatment of industrial wastewater for sewage treatment plant
Sludge containing a large amount of ferro elements measures Fe in dry mud after drying2O3Content between 50%-65%, property such as Tables 1 and 2
It is shown.
The fundamental property of the sewage plant Fenton sludge of table 1
| Color | Smell | State | Content of organic matter % |
| Bronzing | Nothing | Paste | 20~30% |
The content of beary metal (mg/kg mud dry weight) of the sewage plant Fenton sludge of table 2
| Zn | Pb | Cr | Cd | As |
| 75 | 127 | 36 | 5 | 63 |
By table 1, which is bronzing, paste, and no special odor, the content of organic matter is between 20%-30%；
By table 2, contained by heavy metal concentration be respectively less than the requirement in GB4284-84.Therefore, municipal administration is abandoned using the Fenton sludge
It sets sludge and carries out dehydrated in situ processing, secondary pollution will not be generated, additional load will not be caused to environment, there is feasibility.
Embodiment 1:
The Fenton sludge is the chemical sludge that sewage treatment plant uses Fenton oxidation method advanced treating to generate,
Contained heavy metal concentration is respectively less than the requirement in GB4284-84.It is measured after the Fenton sludge drying that the embodiment uses dry
Fe in mud2O3Content be 52.7%.
Specific steps:
(1) sludge containing a large amount of ferro elements generated after Fenton oxidation advanced treatment of industrial wastewater is passed through into sewage treatment
After factory's filters pressing, then after natural air drying or mechanical dehydration, addition is sulfuric acid activated, is present in ferro element therein with ionic forms
In sludge；
(2) plastic draining board is squeezed into the municipal sludge field largely stacked, and dehydration pre-process is carried out to municipal sludge, it will
The moisture generated in following step is discharged using conventional vacuum prepressing water discharge method, makes the preparatory minimizing of municipal sludge and stabilisation；
(3) it will be added in pretreated municipal sludge with the Fenton sludge of sulfuric acid activated mistake, stirring keeps its mixing equal
Even, principle is to form positive charge after being hydrated it, to neutralize the negative electrical charge of mud granule, is allowed to depth and flocculates, in sludge
Divalent carbonate also can be with Fe3+Iron hydroxide is formed, flocculation is provided；
(4) quick lime is added, is stirred using twin shaft multiple-blade agitating device, mixes sludge rapidly with calcium oxide
It is even, it is therefore an objective to adjust pH, deodorization and disinfection, furthermore can enhance grain structure, gap is provided, reduce the compressibility of sludge, generate
Heat partial moisture can also be evaporated, reach deep dehydration and stabilized purpose.
In the step (1), Fenton sludge used is after sewage treatment plant's filters pressing, moisture content 85%, through certainly
So air-dry or mechanical dehydration after solid content be 40%, sulfuric acid activated, sulfuric acid dosage H in molar ratio is added2SO4: Fe=1: 1.
In the step (2), municipal sludge used is the dewatered sludge of municipal sewage plant, moisture content 75%.
In the step (3), by vacuum method of drainage be discharged waste water returned after simple process municipal sewage plant into
Row processing.
In the step (4), agitating mode selects churned mechanically mode, the Fenton sludge added and municipal sludge
Mass ratio is 1: 5, the reaction time 4 hours.
In the step (5), quick lime dosage is added with 40% of wet mud quality in step (3), using double
Axis multiple-blade agitating device is stirred, and after reaction 7 days, through vacuum drainage, measuring moisture percentage in sewage sludge is 55%.
Unconfined compressive strength and shear strength test are surveyed in sampling, and the mixing sludge Leaching of Heavy Metals amount after solidifying.
Mixing sludge unconfined compressive strength after solidification reaches 350kPa, and shear strength reaches 39kPa, sludge after processing,
The geotechnical mechanics intensity requirement that can satisfy landfill, also can be used as general backfill.Heavy metal soaks in mixing sludge after solidification
Concentration is as shown in table 3 out.
The content of beary metal (mg/L) of table 3Fenton sludge
| Zn | Pb | Cr | Cd | As | |
| Raw sewage | 5.520 | 0.002 | 0.010 | 0.001 | 0.006 |
| Sludge 1 after solidification | 2.340 | It is not detected | 0.007 | 0.001 | 0.006 |
By table 3, the leaching concentration of Zn, Pb and Cr decrease in the mixing sludge after solidification, the leaching concentration of Cd and As
Do not change, the requirement in respectively less than GB4284-84.
Embodiment 2:
Fe in dry mud is measured after the Fenton sludge drying that the embodiment uses2O3Content 49.7%.
Specific steps:
(1) sludge containing a large amount of ferro elements generated after Fenton oxidation advanced treatment of industrial wastewater is passed through into sewage treatment
After factory's filters pressing, then after natural air drying or mechanical dehydration, addition is sulfuric acid activated, is present in ferro element therein with ionic forms
In sludge；
(2) plastic draining board is squeezed into the municipal sludge field largely stacked, and dehydration pre-process is carried out to municipal sludge, it will
The moisture generated in following step is discharged using conventional vacuum prepressing water discharge method, makes the preparatory minimizing of municipal sludge and stabilisation；
(3) it will be added in pretreated municipal sludge with the Fenton sludge of sulfuric acid activated mistake, stirring keeps its mixing equal
Even, principle is to form positive charge after being hydrated it, to neutralize the negative electrical charge of mud granule, is allowed to depth and flocculates, in sludge
Divalent carbonate also can be with Fe3+Iron hydroxide is formed, flocculation is provided；
(4) it pulls out and adds quick lime, be stirred using twin shaft multiple-blade agitating device, mix sludge rapidly with calcium oxide
It is even, it is therefore an objective to adjust pH, deodorization and disinfection, furthermore can enhance grain structure, gap is provided, reduce the compressibility of sludge, generate
Heat partial moisture can also be evaporated, reach deep dehydration and stabilized purpose.
In the step (1), Fenton sludge used is after sewage treatment plant's filters pressing, moisture content 81%, through certainly
So air-dry or mechanical dehydration after solid content be 45%, sulfuric acid activated, sulfuric acid dosage H in molar ratio is added2SO4: Fe=0.75:
1。
In the step (2), municipal sludge used is the dewatered sludge of municipal sewage plant, moisture content 78%.
In the step (3), by vacuum method of drainage be discharged waste water returned after simple process municipal sewage plant into
Row processing.
In the step (4), agitating mode selects churned mechanically mode, the Fenton sludge added and municipal sludge
Mass ratio is 1: 10, the reaction time 24 hours.
In the step (5), quick lime dosage is added with 30% of wet mud quality in step (3), using double
Axis multiple-blade agitating device is stirred, and after reaction 5 days, through vacuum drainage, measuring moisture percentage in sewage sludge is 58%.
Unconfined compressive strength and shear strength test are surveyed in sampling, and the mixing sludge Leaching of Heavy Metals amount after solidifying.
Printing and dyeing sludge unconfined compressive strength after solidification reaches 310kPa, and shear strength reaches 37kPa, sludge after processing,
The geotechnical mechanics intensity requirement that can satisfy landfill, also can be used as general backfill.The heavy metal of mixing sludge after solidification soaks
Concentration is as shown in table 4 out.
The content of beary metal (mg/L) of table 4Fenton sludge
| Zn | Pb | Cr | Cd | As | |
| Raw sewage | 5.350 | 0.002 | 0.009 | 0.001 | 0.005 |
| Sludge 1 after solidification | 2.190 | 0.001 | 0.007 | 0.001 | 0.004 |
By table 4, the leaching concentration of Zn, Pb, Cr and As decrease in the mixing sludge after solidification, and the leaching concentration of Cd does not have
It changes, the requirement in respectively less than GB4284-84.
Embodiment 3:
Fe in dry mud is measured after the Fenton sludge drying that the embodiment uses2O3Content 45.2%.
Specific steps:
(1) sludge containing a large amount of ferro elements generated after Fenton oxidation advanced treatment of industrial wastewater is passed through into sewage treatment
After factory's filters pressing, then after natural air drying or mechanical dehydration, addition is sulfuric acid activated, is present in ferro element therein with ionic forms
In sludge；
(2) plastic draining board is squeezed into the municipal sludge field largely stacked, and dehydration pre-process is carried out to municipal sludge, it will
The moisture generated in following step is discharged using conventional vacuum prepressing water discharge method, makes the preparatory minimizing of municipal sludge and stabilisation；
(3) it will be added in pretreated municipal sludge with the Fenton sludge of sulfuric acid activated mistake, stirring keeps its mixing equal
Even, principle is to form positive charge after being hydrated it, to neutralize the negative electrical charge of mud granule, is allowed to depth and flocculates, in sludge
Divalent carbonate also can be with Fe3+Iron hydroxide is formed, flocculation is provided；
(4) quick lime is added, is stirred using twin shaft multiple-blade agitating device, mixes sludge rapidly with calcium oxide
It is even, it is therefore an objective to adjust pH, deodorization and disinfection, furthermore can enhance grain structure, gap is provided, reduce the compressibility of sludge, generate
Heat partial moisture can also be evaporated, reach deep dehydration and stabilized purpose.
In the step (1), Fenton sludge used is after sewage treatment plant's filters pressing, moisture content 78%, through certainly
So air-dry or mechanical dehydration after solid content be 49%, sulfuric acid activated, sulfuric acid dosage H in molar ratio is added2SO4: Fe=0.5: 1.
In the step (2), municipal sludge used is the dewatered sludge of municipal sewage plant, moisture content 81%.
In the step (3), by vacuum method of drainage be discharged waste water returned after simple process municipal sewage plant into
Row processing.
In the step (4), agitating mode selects churned mechanically mode, the Fenton sludge added and municipal sludge
Mass ratio is 1: 15, the reaction time 36 hours.
In the step (5), quick lime dosage is added with 20% of wet mud quality in step (3), using double
Axis multiple-blade agitating device is stirred, and after reaction 3 days, through vacuum drainage, measuring moisture percentage in sewage sludge is 63%.
Unconfined compressive strength and shear strength test are surveyed in sampling, and the printing and dyeing sludge Leaching of Heavy Metals amount after solidifying,
Printing and dyeing sludge unconfined compressive strength after solidification reaches 280kPa, and shear strength reaches 35kPa, sludge after processing,
The geotechnical mechanics intensity requirement that can satisfy landfill, also can be used as general backfill.The heavy metal of mixing sludge after solidification soaks
Concentration is as shown in table 5 out.
The content of beary metal (mg/L) of table 5Fenton sludge
| Zn | Pb | Cr | Cd | As | |
| Raw sewage | 4.950 | 0.002 | 0.011 | 0.002 | 0.009 |
| Sludge 1 after solidification | 2.050 | It is not detected | 0.008 | 0.001 | 0.008 |
By table 5, the leaching concentration of Zn, Pb, Cr, Cd and As decrease in the mixing sludge after solidification, respectively less than
Requirement in GB4284-84.
Embodiment 4:
Fe in dry mud is measured after the Fenton sludge drying that the embodiment uses2O3Content 54.1%.
Specific steps:
(1) sludge containing a large amount of ferro elements generated after Fenton oxidation advanced treatment of industrial wastewater is passed through into sewage treatment
After factory's filters pressing, then after natural air drying or mechanical dehydration, addition is sulfuric acid activated, is present in ferro element therein with ionic forms
In sludge；
(2) plastic draining board is squeezed into the municipal sludge field largely stacked, and dehydration pre-process is carried out to municipal sludge, it will
The moisture generated in following step is discharged using conventional vacuum prepressing water discharge method, makes the preparatory minimizing of municipal sludge and stabilisation；
(3) it will be added in pretreated municipal sludge with the Fenton sludge of sulfuric acid activated mistake, stirring keeps its mixing equal
Even, principle is to form positive charge after being hydrated it, to neutralize the negative electrical charge of mud granule, is allowed to depth and flocculates, in sludge
Divalent carbonate also can be with Fe3+Iron hydroxide is formed, flocculation is provided；
(4) quick lime is added, is stirred using twin shaft multiple-blade agitating device, mixes sludge rapidly with calcium oxide
It is even, it is therefore an objective to adjust pH, deodorization and disinfection, furthermore can enhance grain structure, gap is provided, reduce the compressibility of sludge, generate
Heat partial moisture can also be evaporated, reach deep dehydration and stabilized purpose.
In the step (1), Fenton sludge used is after sewage treatment plant's filters pressing, moisture content 75%, through certainly
So air-dry or mechanical dehydration after solid content be 50%, sulfuric acid activated, sulfuric acid dosage H in molar ratio is added2SO4: Fe=0.25:
1。
In the step (2), municipal sludge used is the dewatered sludge of municipal sewage plant, moisture content 81%.
In the step (3), by vacuum method of drainage be discharged waste water returned after simple process municipal sewage plant into
Row processing.
In the step (4), agitating mode selects churned mechanically mode, the Fenton sludge added and municipal sludge
Mass ratio is 1: 20, the reaction time 48 hours.
In the step (5), quick lime dosage is added with 20% of wet mud quality in step (3), using double
Axis multiple-blade agitating device is stirred, and after reaction 2 days, through vacuum drainage, measuring moisture percentage in sewage sludge is 68%.
Unconfined compressive strength and shear strength test are surveyed in sampling, and the mixing sludge Leaching of Heavy Metals amount after solidifying,
Mixing sludge unconfined compressive strength after solidification reaches 240kPa, and shear strength reaches 33kPa, sludge after processing,
The geotechnical mechanics intensity requirement that can satisfy landfill, also can be used as general backfill.The heavy metal of mixing sludge after solidification soaks
Concentration is as shown in table 6 out.
The content of beary metal (mg/L) of table 6Fenton sludge
| Zn | Pb | Cr | Cd | As | |
| Raw sewage | 5.100 | 0.002 | 0.011 | 0.002 | 0.009 |
| Sludge 1 after solidification | 2.150 | 0.001 | 0.008 | It is not detected | 0.005 |
By table 6, the leaching concentration of Zn, Pb, Cr, Cd and As decrease in the mixing sludge after solidification, respectively less than
Requirement in GB4284-84.
Claims (6)
1. it is a kind of using Fenton sludge to the method for municipal sludge dehydrated in situ, it is characterised in that steps are as follows:
(1) sludge containing a large amount of ferro elements generated after Fenton oxidation advanced treatment of industrial wastewater is pressed by sewage treatment plant
After filter, then after natural air drying or mechanical dehydration, addition is sulfuric acid activated, and ferro element therein is made to be present in sludge with ionic forms
In；
(2) plastic draining board is squeezed into the municipal sludge field largely stacked, and dehydration pre-process is carried out to municipal sludge, it will be above-mentioned
The moisture generated in step is discharged using conventional vacuum prepressing water discharge method, makes the preparatory minimizing of municipal sludge and stabilisation；
(3) it being added in pretreated municipal sludge with the Fenton sludge of sulfuric acid activated mistake, stirring is uniformly mixed it,
Principle is to form positive charge after being hydrated it, to neutralize the negative electrical charge of mud granule, is allowed to depth flocculation, the dicovalent carbon in sludge
Hydrochlorate also can form iron hydroxide with Fe3+, provide flocculation；
(4) quick lime is added, is stirred using twin shaft multiple-blade agitating device, is uniformly mixed sludge rapidly with calcium oxide,
Purpose is to adjust pH, deodorization and disinfection, furthermore can enhance grain structure, provide gap, reduce the compressibility of sludge, the heat of generation
Amount can also evaporate partial moisture, reach deep dehydration and stabilized purpose.
2. it is according to claim 1 it is a kind of using Fenton sludge to the method for municipal sludge dehydrated in situ, feature exists
The chemical sludge of Fenton oxidation method advanced treating generation is used for sewage treatment plant in the Fenton sludge, contained by
Heavy metal concentration is respectively less than the requirement in GB4284-84.
3. it is according to claim 1 it is a kind of using Fenton sludge to the method for municipal sludge dehydrated in situ, feature exists
In step (1), Fenton moisture percentage in sewage sludge used is 75%~85%, and solid content is big after natural air drying or mechanical dehydration
In 40%, sulfuric acid activated, sulfuric acid dosage H in molar ratio is added2SO4: Fe=0.25~1: 1.
4. it is according to claim 1 it is a kind of using Fenton sludge to the method for municipal sludge dehydrated in situ, feature exists
In step (3), municipal sewage plant is returned to after simple process by the waste water that vacuum method of drainage is discharged and is handled.
5. it is according to claim 1 it is a kind of using Fenton sludge to the method for municipal sludge dehydrated in situ, feature exists
In step (4), agitating mode may be selected mechanical stirring or manually turn over mixed mode, the Fenton sludge and municipal sludge added
Mass ratio be 1: 5~20, in mixed sludge, for the mass content of ferro element between 1%~4%, the reaction time is not small
In 4 hours.
6. it is according to claim 1 it is a kind of using Fenton sludge to the method for municipal sludge dehydrated in situ, feature exists
In step (4), quick lime dosage is added with 10%~40% of wet mud quality in step (3), and curing time is not
Less than 2 days.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201511016687.9A CN105417928B (en) | 2015-12-28 | 2015-12-28 | A method of using Fenton sludge to municipal sludge dehydrated in situ |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201511016687.9A CN105417928B (en) | 2015-12-28 | 2015-12-28 | A method of using Fenton sludge to municipal sludge dehydrated in situ |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105417928A CN105417928A (en) | 2016-03-23 |
| CN105417928B true CN105417928B (en) | 2019-03-26 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN109851190B (en) * | 2018-12-27 | 2024-02-06 | 广州市金龙峰环保设备工程股份有限公司 | Treatment system and treatment method for drying polluted bottom mud |
| CN110314687B (en) * | 2019-07-29 | 2022-11-04 | 沈阳理工大学 | Fe 3+ Load composite catalyst and preparation method thereof and Fenton-like sludge dehydration pretreatment method |
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