CN107473564A - The method for innocent treatment and system of a kind of domestic sludge - Google Patents
The method for innocent treatment and system of a kind of domestic sludge Download PDFInfo
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- CN107473564A CN107473564A CN201710880482.8A CN201710880482A CN107473564A CN 107473564 A CN107473564 A CN 107473564A CN 201710880482 A CN201710880482 A CN 201710880482A CN 107473564 A CN107473564 A CN 107473564A
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- flue gas
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- domestic sludge
- burning
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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
-
- 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
- C02F11/121—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering
- C02F11/122—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering using filter presses
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G5/00—Incineration of waste; Incinerator constructions; Details, accessories or control therefor
- F23G5/44—Details; Accessories
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G7/00—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals
- F23G7/001—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals for sludges or waste products from water treatment installations
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- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Mechanical Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Treatment Of Sludge (AREA)
Abstract
The invention belongs to Solid Waste Treatment technical field, and in particular to the method for innocent treatment and system of a kind of domestic sludge.It is an object of the invention to provide a kind of method for innocent treatment of domestic sludge, by carrying out the dehydration preprocess method of secondary mixing to domestic sludge, realizes the harmless treatment to biological sludge；In addition, according to the processing system of this method independent research, system Construction expense is few, and operating cost is low, is opened up a new way for the harmless treatment and comprehensive utilization of resources of domestic sludge.
Description
Technical field
The invention belongs to Solid Waste Treatment technical field, and in particular to a kind of method for innocent treatment of domestic sludge and
System.
Background technology
Domestic sludge, also referred to as sewage plant sludge, municipal sludge, it is with the increase of municipal sewage treatment amount and long-term, steady
, following three features be present in sludge caused by fixed, substantial amounts of：First, the content of organic matter is high, typically constitutes from the 50% of its contents on dry basis
More than, while also containing nutriments such as substantial amounts of nitrogen phosphorus；Second, because sewage plant also receives some industrial wastewaters, its sludge
In also contain a certain proportion of heavy metal ion and chemical substance, particularly containing a certain amount of harmful chemical, can such as inhale
Attached property organic halogen, anion synthetic detergent etc., and substantial amounts of pathogenic microorganism；3rd, moisture content is high, and is dehydrated tired
Difficulty, 80% or so, wet combustion calorific value substantially reduces domestic sludge moisture content caused by general sewage treatment plant, can not be effectively sharp
With its organic matter.
At present, the processing method of domestic sludge includes following four technology：1) Landfill, substantial amounts of soil is not only caused
Waste, and secondary pollution be present；2) aerobic compost, it is necessary to conserve drying evaporation moisture, occupied ground is more, and transformation time compared with
It is long, equally also pollute the environment；3) burn, but directly not only equipment investment is big, operation cost is higher for burning, bioxin etc. be present
The problem of toxic gas discharges, and waste the energy；At present, the innoxious place of domestic sludge is still can solve the problem that without efficient technology
Reason and resource regeneration.
The content of the invention
It is an object of the invention to provide a kind of method for innocent treatment of domestic sludge and system, methods described can be to life
The thorough Detoxified treatments such as organic matter, heavy metal ion and toxic chemical substance in sludge living, do not produce new harmful substance, real
The harmless treatment of existing domestic sludge；In addition, few according to the system Construction expense of this method independent research, operating cost is low, is
The harmless treatment and comprehensive utilization of resources of domestic sludge open up a new way.
For achieving the above object, the present invention provides following technical scheme：
A kind of method for innocent treatment of domestic sludge refers in sludge incineration processing and gas cleaning before processing to life
Sludge carries out dehydration pretreatment, it is characterised in that the dehydration pretreatment includes following two steps：
Step 1：Domestic sludge, lime and aluminium polychloride are mixed in proportion, through dehydration be made moisture content be 60~
65% mud cake；
Step 2：Based on domestic sludge original quality, by the biomass carbon dust for accounting for domestic sludge original quality 1-10% and account for
Domestic sludge original quality 2-5% chaff shell, mixing sludge is mixed to prepare with step 1 gained mud cake.
First time sludge mixes with lime, aluminium polychloride, and the effect of aluminium polychloride is sludge to be played quenched, makes pressure
Reach more preferable dehydrating effect in filter, the effect of lime is to carry out desulfurization process to sludge；Before press filtration, polyaluminium is only added
Aluminium and lime, avoiding disposably adding chaff shell and biomass carbon increases press filtration volume, meanwhile, this time press filtration is only needed sludge
Water content be down to 60% or so from 80% or so, reduce further the difficulty and energy consumption of press filtration.Sludge after dehydration, it is aqueous
Rate reduces, and viscosity reduces, and material is looser when being mixed again, is mixed with chaff shell, biomass carbon, reduces again mixed
Close the moisture content of sludge, improve the combustion heat value of sludge, secondary mixing it also avoid in press filtration due to lime, domestic sludge and
Aluminium polychloride property and caused lamination, make material mixing more uniform, be more beneficial for the abundant burning of mixing sludge.
Preferably, the ratio of domestic sludge, lime and aluminium polychloride is 100 in mass ratio in the step 1:1~10:
1~6.
Preferably, the ratio of domestic sludge, lime and aluminium polychloride is 100 in mass ratio in the step 1：5：3.
Domestic sludge, lime and aluminium polychloride (PAC) in mass ratio 100 in step 1：5：, can during 3 ratio mixing
Significantly reduce the viscosity of domestic sludge, improve dehydration rate, and caused by being burned in burning process with domestic sludge it is chloride, contain
Sulphur compound is reacted, the heavy metal components in fixed domestic sludge, reaches dechlorination, desulfurization, fixed heavy metal effect, so as to
The predecessor formation condition of bioxin is abolished, mud cake made from step 1, it is left that its moisture content can be down to 60% from 80% or so
The right side, the near 10500-11000 centipoises of kinematic viscosity.
Preferably, the aluminium polychloride refers to the polyaluminium aluminum water solution of mass percentage concentration 30%.
Preferably, the burning disposal refers to mixing sludge through negative-pressure cyclic accumulation of heat CIU burning disposal, described
Negative-pressure cyclic accumulation of heat CIU refers to carry out pre-dried CIU to mixing sludge using flue gas caused by burning.
Preferably, the gas cleaning processing comprises the following steps：
Step a：Flue gas heat exchange caused by burning, is delivered in sack cleaner by air-introduced machine and removes flue dust, dedusting effect
Rate more than 98%；
Step b：Waste gas after step a dedustings is subjected to spray sulphur removal, spray liquid is sodium hydroxide solution, sodium hydroxide energy
Sulfur dioxide in enough and flue gas forms sodium sulfite, and sodium sulfite can be by regenerating hydroxide with calcium hydroxide reaction
Sodium, so as to realize that sodium hydroxide obtains circular regeneration, sulfur removal effectiveness is up to 60%, while spray liquid can also remove the cigarette of residual
Dirt；
Step c：Waste gas after step b desulfurization is subjected to wet denitration, by spraying urea liquid and controlling solution PH by cigarette
Nitrogen oxides in gas is reduced into nitrogen, realizes the purpose of denitration, and the method can remove in flue gas more than 80% NOx；
Step d：Flue gas after step c denitrations is sent into steam-water separator, the water quilt in steam-water separator in flue gas
Separate the preparation that can be used for aluminium polychloride after collection；
Step e：By the flue gas after step d processing by active carbon adsorber, removing flue gas by charcoal absorption may
The heavy metal and bioxin of residual, make flue gas up to standard.
The present invention's also provides a kind of innocuity disposal system of domestic sludge, including domestic sludge is carried out to be dehydrated pre- place
The pretreatment system of reason, the negative-pressure cyclic accumulation of heat CIU of burning disposal, slag treatment system and right are carried out to mixing sludge
Flue gas carries out the flue gas purification system of gas cleaning processing, it is characterised in that the pretreatment system includes：Lived for mixing
First batch mixer of sludge, lime and aluminium polychloride, filter press for press filtration sludge, for mixing mud cake, biomass carbon
With the second batch mixer of chaff shell, multiple weighing balances and storage bin, wherein, the first batch mixer, filter press and the second batch mixer are successively
It is connected by conveying arrangement, first batch mixer is double-shaft spiral batch mixer or colter batch mixer, second batch mixer
For double-shaft spiral batch mixer or colter batch mixer, the filter press is steel band type filter press or plate and frame filter press.
Preferably, the innocuity disposal system of the domestic sludge also includes entering the innocuity disposal system of domestic sludge
Row monitoring and the central control system of control.
Preferably, the negative-pressure cyclic accumulation of heat CIU, including：There is cloth section, preheating section, section of lighting a fire successively, burn
Burn the incinerator of section and cooling section；Smoke circulating device above incineration section；Distribution device above cloth section and positioned at pre-
Hot arc, igniting section, incineration section and the extractor fan of cooling, the incinerator also include：Preheating cover, igniting above preheating section
Duan Shangfang igniter, can be in cloth section, preheating section, igniting section, incineration section and cooling section burning chassis slidably and pre-
Warm-up cycle gas approach on heat cover, the import of the warm-up cycle flue gas are used for entering for the circulating flue gas from incineration section
Enter.
The import of warm-up cycle flue gas makes flue gas caused by burning enter preheating section, using heat caused by burning to mixing
Sludge has carried out predrying, reduces the water content of mixing sludge, is advantageous to it and fully burns, avoids mixing sludge and lighting a fire
Stage rests on low-temperature zone for a long time, weakens the temperature environment to form bioxin.
Preferably, the smoke circulating device includes single or multiple independent flue gas covers, has circulating flue gas in flue gas cover
Import and air intlet, the extractor fan include three or more than three independent draught hoods, exhausting are connected with draught hood
Pipe, exhaust column are provided with air pump；Draught hood is connected with first flue gas cover above incineration section below igniting section, position
Last draught hood below incineration section is connected with preheating cover, the draught hood below cooling section and gas cleaning system
System is connected.The circulating flue gas import makes smoke secondary caused by burning be burned into incinerator, and air intlet makes air
Pouring in incinerator helps sludge fully to burn.Smoke circulating device is advantageous to imperfect combustion in removing combustion product gases
Granulated carbon, carbon monoxide and organic matter, and carry out second-time burning, be particularly advantageous to remove burn caused by bioxin, make its
Decomposed under high temperature, while also recycled heat caused by burning.
Preferably, the slag treatment system is used to residue carrying out brickmaking, potting grain.
Preferably, the flue gas purification system includes heat exchanger, cyclone separator, desulfurizing tower, denitrating tower, carbonated drink point successively
From device, active carbon adsorber.
Heat exchanger will burn caused by flue gas heat exchange, delivered to by air-introduced machine in sack cleaner and remove flue dust, dedusting effect
Rate reaches more than 98%；Flue gas carries out spray sulphur removal by desulfurizing tower, and spray liquid is sodium hydroxide solution, and sodium hydroxide can be with
Sulfur dioxide in flue gas forms sodium sulfite, and sodium sulfite can by regenerating sodium hydroxide with calcium hydroxide reaction, from
And can realize that sodium hydroxide obtains circular regeneration, sulfur removal effectiveness Danone enough 60%, while spray liquid can also remove the flue dust of residual；
Waste gas enters wet denitration tower after desulfurization, by spraying urea liquid and controlling solution PH to be reduced into the nitrogen oxides in flue gas
Nitrogen, in flue gas more than 80% NOx can be removed；Flue gas after denitration is sent into steam-water separator, the cigarette in steam-water separator
Water in gas is separated can be used for the preparation of aluminium polychloride after collection, realize the secondary use of water；Flue gas passes through work
Property charcoal absorber, the heavy metal that may remain of flue gas is removed by charcoal absorption, makes flue gas up to standard.
The method for innocent treatment and system of domestic sludge provided by the invention, have the advantage that：
1. employing the dehydration preprocess method of secondary mixing, press filtration difficulty and energy consumption to domestic sludge are reduced, is entered
One step makes material mixing more uniform, is advantageous to the abundant burning of mixing sludge；
2. employ negative-pressure cyclic accumulation of heat CIU carries out burning disposal to sludge, sludge incineration generation is taken full advantage of
Heat, secondary use has been carried out to flue gas caused by sludge incineration, the moisture content of mixing sludge has been reduced, weakens bioxin
Caused temperature environment.
3. employing smoke circulating device, second-time burning is carried out to flue gas caused by sludge incineration, reduced in flue gas
The generation of pollutant, reduces the generation of pollutant, and flue gas is made flue gas reach discharge standard, realized by smoke processing system
Harmless treatment to sludge.
4. system Construction expense is few, operating cost is low, is opened up for the harmless treatment and comprehensive utilization of resources of domestic sludge
One new approach.
Brief description of the drawings
Fig. 1：Pretreatment system structural representation.
In figure, 1- pretreatment systems, 11- storage bins, 12- weighing balances, the batch mixers of 13- first, 14- filter presses, 15- second
Batch mixer, 16-conveying arrangement.
Fig. 2：Negative-pressure cyclic accumulation of heat CIU structural representation.
In figure, 2- negative-pressure cyclic accumulation of heat CIUs；20- incinerators, 200- clothes section, 201- preheating sections, 202- points
Fiery section, 203- incineration sections, 204- cooling sections, 205- igniters, 206- preheatings cover, 207- warm-up cycles gas approach, 208- burn
Burn chassis；21- distribution devices, 210- material scattering devices；22- smoke circulating devices, the import of 220- circulating flue gas, 221- air enter
Mouth, 222- flue gas covers；23- extractor fans, 230- draught hoods, 231- exhaust columns, 232- air pumps；3- slag treatment systems；4-
Flue gas purification system
Embodiment
The present invention is further detailed below in conjunction with the accompanying drawings.
Embodiment 1
A kind of method for innocent treatment step of domestic sludge：
First, dehydration pretreatment
Step 1：By domestic sludge, lime and aluminium polychloride in mass ratio 100：5：3 mixing, are dehydrated by filter and are made
Moisture content is 60% mud cake, and wherein aluminium polychloride refers to the polyaluminium aluminum water solution of mass percentage concentration 30%.；
Step 2：Based on domestic sludge original quality, by the biomass carbon dust for accounting for domestic sludge original quality 10% and life is accounted for
The chaff shell of sludge original quality 5% living, mixing sludge is mixed to prepare with step 1 gained mud cake.
Domestic sludge, lime and aluminium polychloride (PAC) in mass ratio 100 in step 1：5：, can during 3 ratio mixing
Significantly reduce the viscosity of domestic sludge, improve dehydration rate, and caused by being burned in burning process with domestic sludge it is chloride, contain
Sulphur compound is reacted, the heavy metal components in fixed domestic sludge, reaches dechlorination, desulfurization, fixed heavy metal effect, so as to
The predecessor formation condition of bioxin is abolished, mud cake made from step 1, it is left that its moisture content can be down to 60% from 80% or so
The right side, the near 10500-11000 centipoises of kinematic viscosity.
First time sludge mixes with lime, aluminium polychloride, and the effect of aluminium polychloride is that quenched dehydration is played to sludge,
Make to reach more preferable dehydrating effect in steel band filter press, the effect of lime is to carry out desulfurization process to sludge；Before press filtration, only add
Aluminium polychloride and lime, avoiding disposably adding chaff shell and biomass carbon increases press filtration volume, meanwhile, this time press filtration is only
The water content of sludge need to be down to 60% or so from 80% or so, reduce further the difficulty and energy consumption of press filtration.After dehydration
Sludge, moisture content reduce, and viscosity reduces, and material is looser when being mixed again, is mixed with chaff shell, biomass carbon,
Reduce the moisture content of mixing sludge again, improve the combustion heat value of sludge, secondary mixing it also avoid in press filtration due to lime,
Domestic sludge and aluminium polychloride property with and caused lamination, make material mixing more uniform, it is dirty to be more beneficial for mixing
The abundant burning of mud.
2nd, burning disposal
Burning disposal refers to mixing sludge through negative-pressure cyclic accumulation of heat CIU burning disposal, wherein, negative-pressure cyclic stores
Thermal incineration system refers to carry out pre-dried CIU to mixing sludge using flue gas caused by burning.
3rd, gas cleaning is handled
Gas cleaning processing comprises the following steps：
Step a：Flue gas heat exchange caused by burning, is delivered in sack cleaner by air-introduced machine and removes flue dust, dedusting effect
Rate more than 98%；
Step b：Waste gas after step a dedustings is subjected to spray sulphur removal, spray liquid is sodium hydroxide solution, sodium hydroxide energy
Sulfur dioxide in enough and flue gas forms sodium sulfite, and sodium sulfite can be by regenerating hydroxide with calcium hydroxide reaction
Sodium, so as to realize that sodium hydroxide obtains circular regeneration, sulfur removal effectiveness is up to 60%, while spray liquid can also remove the cigarette of residual
Dirt；
Step c：Waste gas after step b desulfurization is subjected to wet denitration, by spraying urea liquid and controlling solution PH by cigarette
Nitrogen oxides in gas is reduced into nitrogen, realizes the purpose of denitration, and the method can remove in flue gas more than 80% NOx；
Step d：Flue gas after step c denitrations is sent into steam-water separator, the water quilt in steam-water separator in flue gas
Separate the preparation that can be used for aluminium polychloride after collection；
Step e：By the flue gas after step d processing by active carbon adsorber, removing flue gas by charcoal absorption may
The heavy metal and bioxin of residual, make flue gas up to standard.
Embodiment 2
A kind of method for innocent treatment step of domestic sludge：
First, dehydration pretreatment
Step 1：By domestic sludge, lime and aluminium polychloride in mass ratio 100：1：6 mixing, are dehydrated by filter and are made
Moisture content is 63% mud cake, and wherein aluminium polychloride refers to the polyaluminium aluminum water solution of mass percentage concentration 30%；
Step 2：Based on domestic sludge original quality, by the biomass carbon dust for accounting for domestic sludge original quality 5% and life is accounted for
The chaff shell of sludge original quality 5% living, mixing sludge is mixed to prepare with step 1 gained mud cake.
Domestic sludge, lime and aluminium polychloride (PAC) in mass ratio 100 in step 1：1：, can during 6 ratio mixing
Significantly reduce the viscosity of domestic sludge, improve dehydration rate, and caused by being burned in burning process with domestic sludge it is chloride, contain
Sulphur compound is reacted, the heavy metal components in fixed domestic sludge, reaches dechlorination, desulfurization, fixed heavy metal effect, so as to
The predecessor formation condition of bioxin is abolished, mud cake made from step 1, it is left that its moisture content can be down to 63% from 80% or so
The right side, the near 10700-11200 centipoises of kinematic viscosity.
First time sludge mixes with lime, aluminium polychloride, and the effect of aluminium polychloride is that quenched dehydration is played to sludge,
Make to reach more preferable dehydrating effect in steel band filter press, the effect of lime is to carry out desulfurization process to sludge；Before press filtration, only add
Aluminium polychloride and lime, avoiding disposably adding chaff shell and biomass carbon increases press filtration volume, meanwhile, this time press filtration is only
The water content of sludge need to be down to 60% or so from 80% or so, reduce further the difficulty and energy consumption of press filtration.After dehydration
Sludge, moisture content reduce, and viscosity reduces, and material is looser when being mixed again, is mixed with chaff shell, biomass carbon,
Reduce the moisture content of mixing sludge again, improve the combustion heat value of sludge, secondary mixing it also avoid in press filtration due to lime,
Domestic sludge and aluminium polychloride property with and caused lamination, make material mixing more uniform, it is dirty to be more beneficial for mixing
The abundant burning of mud.
2nd, burning disposal
Burning disposal refers to mixing sludge through negative-pressure cyclic accumulation of heat CIU burning disposal, wherein, negative-pressure cyclic stores
Thermal incineration system refers to carry out pre-dried CIU to mixing sludge using flue gas caused by burning.
3rd, gas cleaning is handled
Gas cleaning processing comprises the following steps：
Step a：Flue gas heat exchange caused by burning, is delivered in sack cleaner by air-introduced machine and removes flue dust, dedusting effect
Rate more than 98%；
Step b：Waste gas after step a dedustings is subjected to spray sulphur removal, spray liquid is sodium hydroxide solution, sodium hydroxide energy
Sulfur dioxide in enough and flue gas forms sodium sulfite, and sodium sulfite can be by regenerating hydroxide with calcium hydroxide reaction
Sodium, so as to realize that sodium hydroxide obtains circular regeneration, sulfur removal effectiveness is up to 60%, while spray liquid can also remove the cigarette of residual
Dirt；
Step c：Waste gas after step b desulfurization is subjected to wet denitration, by spraying urea liquid and controlling solution PH by cigarette
Nitrogen oxides in gas is reduced into nitrogen, realizes the purpose of denitration, and the method can remove in flue gas more than 80% NOx；
Step d：Flue gas after step c denitrations is sent into steam-water separator, the water quilt in steam-water separator in flue gas
Separate the preparation that can be used for aluminium polychloride after collection；
Step e：By the flue gas after step d processing by active carbon adsorber, removing flue gas by charcoal absorption may
The heavy metal and bioxin of residual, make flue gas up to standard.
Embodiment 3
A kind of method for innocent treatment step of domestic sludge：
First, dehydration pretreatment
Step 1：By domestic sludge, lime and aluminium polychloride in mass ratio 100：10：2 mixing, are dehydrated by filter and make
The mud cake that moisture content is 63% is obtained, wherein aluminium polychloride refers to the polyaluminium aluminum water solution of mass percentage concentration 30%；
Step 2：Based on domestic sludge original quality, by the biomass carbon dust for accounting for domestic sludge original quality 10% and life is accounted for
The chaff shell of sludge original quality 2% living, mixing sludge is mixed to prepare with step 1 gained mud cake.
Domestic sludge, lime and aluminium polychloride (PAC) in mass ratio 100 in step 1：10：During 2 ratio mixing, energy
Enough significantly reduce the viscosity of domestic sludge, improve dehydration rate, and caused by being burned in burning process with domestic sludge it is chloride,
Sulfur-containing compound is reacted, the heavy metal components in fixed domestic sludge, reaches dechlorination, desulfurization, fixed heavy metal effect, from
And the predecessor formation condition of bioxin is abolished, mud cake made from step 1, it is left that its moisture content can be down to 60% from 80% or so
The right side, the near 10600-11200 centipoises of kinematic viscosity.
First time sludge mixes with lime, aluminium polychloride, and the effect of aluminium polychloride is that quenched dehydration is played to sludge,
Make to reach more preferable dehydrating effect in steel band filter press, the effect of lime is to carry out desulfurization process to sludge；Before press filtration, only add
Aluminium polychloride and lime, avoiding disposably adding chaff shell and biomass carbon increases press filtration volume, meanwhile, this time press filtration is only
The water content of sludge need to be down to 60% or so from 80% or so, reduce further the difficulty and energy consumption of press filtration.After dehydration
Sludge, moisture content reduce, and viscosity reduces, and material is looser when being mixed again, is mixed with chaff shell, biomass carbon,
Reduce the moisture content of mixing sludge again, improve the combustion heat value of sludge, secondary mixing it also avoid in press filtration due to lime,
Domestic sludge and aluminium polychloride property with and caused lamination, make material mixing more uniform, it is dirty to be more beneficial for mixing
The abundant burning of mud.
2nd, burning disposal
Burning disposal refers to mixing sludge through negative-pressure cyclic accumulation of heat CIU burning disposal, wherein, negative-pressure cyclic stores
Thermal incineration system refers to carry out pre-dried CIU to mixing sludge using flue gas caused by burning.
3rd, gas cleaning is handled
Gas cleaning processing comprises the following steps：
Step a：Flue gas heat exchange caused by burning, is delivered in sack cleaner by air-introduced machine and removes flue dust, dedusting effect
Rate more than 98%；
Step b：Waste gas after step a dedustings is subjected to spray sulphur removal, spray liquid is sodium hydroxide solution, sodium hydroxide energy
Sulfur dioxide in enough and flue gas forms sodium sulfite, and sodium sulfite can be by regenerating hydroxide with calcium hydroxide reaction
Sodium, so as to realize that sodium hydroxide obtains circular regeneration, sulfur removal effectiveness is up to 60%, while spray liquid can also remove the cigarette of residual
Dirt；
Step c：Waste gas after step b desulfurization is subjected to wet denitration, by spraying urea liquid and controlling solution PH by cigarette
Nitrogen oxides in gas is reduced into nitrogen, realizes the purpose of denitration, and the method can remove in flue gas more than 80% NOx；
Step d：Flue gas after step c denitrations is sent into steam-water separator, the water quilt in steam-water separator in flue gas
Separate the preparation that can be used for aluminium polychloride after collection；
Step e：By the flue gas after step d processing by active carbon adsorber, removing flue gas by charcoal absorption may
The heavy metal and bioxin of residual, make flue gas up to standard.
Embodiment 4
A kind of method for innocent treatment step of domestic sludge：
First, dehydration pretreatment
Step 1：By domestic sludge, lime and aluminium polychloride in mass ratio 100：4：3 mixing, are dehydrated by filter and are made
Moisture content is 63% mud cake, and wherein aluminium polychloride refers to the polyaluminium aluminum water solution of mass percentage concentration 30%；
Step 2：Based on domestic sludge original quality, by the biomass carbon dust for accounting for domestic sludge original quality 7% and life is accounted for
The chaff shell of sludge original quality 4% living, mixing sludge is mixed to prepare with step 1 gained mud cake.
Domestic sludge, lime and aluminium polychloride (PAC) in mass ratio 100 in step 1：4：, can during 3 ratio mixing
Significantly reduce the viscosity of domestic sludge, improve dehydration rate, and caused by being burned in burning process with domestic sludge it is chloride, contain
Sulphur compound is reacted, the heavy metal components in fixed domestic sludge, reaches dechlorination, desulfurization, fixed heavy metal effect, so as to
The predecessor formation condition of bioxin, mud cake made from step 1 are abolished, its moisture content can be down to 63% from 80% or so, fortune
The near 10700-11200 centipoises of kinetic viscosity.
First time sludge mixes with lime, aluminium polychloride, and the effect of aluminium polychloride is that quenched dehydration is played to sludge,
Make to reach more preferable dehydrating effect in steel band filter press, the effect of lime is to carry out desulfurization process to sludge；Before press filtration, only add
Aluminium polychloride and lime, avoiding disposably adding chaff shell and biomass carbon increases press filtration volume, meanwhile, this time press filtration is only
The water content of sludge 60% or so % be need to be down to from 80% or so, the difficulty and energy consumption of press filtration reduce further.After dehydration
Sludge, moisture content reduce, viscosity reduce, material is looser when being mixed again, is mixed with chaff shell, biomass carbon
Close, reduce the moisture content of mixing sludge again, improve the combustion heat value of sludge, secondary mixing it also avoid in press filtration due to stone
Ash, domestic sludge and aluminium polychloride property with and caused lamination, make material mixing more uniform, be more beneficial for mixing
The abundant burning of sludge.
2nd, burning disposal
Burning disposal refers to mixing sludge through negative-pressure cyclic accumulation of heat CIU burning disposal, wherein, negative-pressure cyclic stores
Thermal incineration system refers to carry out pre-dried CIU to mixing sludge using flue gas caused by burning.
3rd, gas cleaning is handled
Gas cleaning processing comprises the following steps：
Step a：Flue gas heat exchange caused by burning, is delivered in sack cleaner by air-introduced machine and removes flue dust, dedusting effect
Rate more than 98%；
Step b：Waste gas after step a dedustings is subjected to spray sulphur removal, spray liquid is sodium hydroxide solution, sodium hydroxide energy
Sulfur dioxide in enough and flue gas forms sodium sulfite, and sodium sulfite can be by regenerating hydroxide with calcium hydroxide reaction
Sodium, so as to realize that sodium hydroxide obtains circular regeneration, sulfur removal effectiveness is up to 60%, while spray liquid can also remove the cigarette of residual
Dirt；
Step c：Waste gas after step b desulfurization is subjected to wet denitration, by spraying urea liquid and controlling solution PH by cigarette
Nitrogen oxides in gas is reduced into nitrogen, realizes the purpose of denitration, and the method can remove in flue gas more than 80% NOx；
Step d：Flue gas after step c denitrations is sent into steam-water separator, the water quilt in steam-water separator in flue gas
Separate the preparation that can be used for aluminium polychloride after collection；
Step e：By the flue gas after step d processing by active carbon adsorber, removing flue gas by charcoal absorption may
The heavy metal and bioxin of residual, make flue gas up to standard.
Embodiment 5
Referring to Fig. 1-2, according to the processing system of the method for innocent treatment independent research of above-mentioned domestic sludge, including to life
Sludge living carries out being dehydrated the pretreatment system 1 of pretreatment, the negative-pressure cyclic accumulation of heat burning system of burning disposal is carried out to mixing sludge
System 2, slag treatment system 3, the flue gas purification system 4 of gas cleaning processing and the innoxious place to domestic sludge are carried out to flue gas
The central control system (not indicating) that reason system is monitored and controlled；The pretreatment system 1 includes：Lived for mixing
First batch mixer 13 of sludge, lime and aluminium polychloride, filter press 14 for press filtration sludge, for mixing mud cake, biology
Second batch mixer 15 of matter charcoal and chaff shell, multiple weighing balances 12 and storage bin 11, wherein, the first batch mixer 13, the and of filter press 14
Second batch mixer 15 passes sequentially through conveying arrangement 16 and is connected, and first and second batch mixer is specially double-shaft spiral batch mixer, filter press
Specially steel band type filter press；The negative-pressure cyclic accumulation of heat CIU 2 includes：Successively have cloth section 200, preheating section 201,
The incinerator 20 of igniting section 202, incineration section 203 and cooling section 204；The smoke circulating device 22 of the top of incineration section 203；Cloth
Section 200 top distribution device 21 and positioned at preheating section 201, igniting section 202, incineration section 203 and cooling extractor fan 23, institute
Stating incinerator 20 also includes：The preheating cover of the top of preheating section 201, the igniter 205 and preheating cover 206 of the top of igniting section 202
On warm-up cycle gas approach 207, the import of the warm-up cycle flue gas is used for entering for the circulating flue gas from incineration section 203
Enter；Smoke circulating device 22 includes 3 independent flue gas covers 222, in flue gas cover 222 there is circulating flue gas import 220 and air to enter
Mouth 221, the circulating flue gas import 220 makes smoke secondary caused by burning be burned into incinerator 20, and air intlet 221 makes
Air pours in incinerator 20 and helps sludge fully to burn；The extractor fan 23 includes 18 independent draught hoods 230,
Exhaust column 231 is connected with draught hood 230, exhaust column 231 is provided with air pump 232；The flue gas purification system 4 includes successively
Heat exchanger, cyclone separator, desulfurizing tower, denitrating tower, steam-water separator, active carbon adsorber；The slag treatment system 3 is used will
Residue carries out brickmaking, potting grain.
The innocuity disposal system of the domestic sludge so works, by weighing balance 12 by domestic sludge, lime
Weigh, transport to the batch mixing of the first batch mixer 13 in mass ratio with aluminium polychloride, stir to obtain mixed once sludge, once mixes
Close sludge to transport to filter press 14 after preliminary hydro-extraction, moisture content is changed into 68-73%, kinematic viscosity 10000-11000 centipoises.
Enter back into higher-pressure region to continue to be dehydrated to obtain mud cake, the moisture content of mud cake is reduced to 60% or so, 10500-11000 lis of kinematic viscosity
Pool.Based on domestic sludge original quality, biomass carbon dust and chaff shell are weighed, is made mixed by the batch mixing of the second batch mixer 15 with mud cake
Close sludge.Mixing sludge is transported to distribution device 210, the material scattering device 210 of the lower end of distribution device 210 and beats mixing sludge
Dissipating makes it loosely equably spread out on chassis 208 is burned, and the thickness of the bed of material is 700mm.Burn chassis 208 and slide into preheating section
201, now, flue gas caused by the burning of incineration section 203 by extractor fan 23 is evacuated to preheating section 201, and (now, whole system is normal
Open, it is multiple in preheating, igniting, burn and cooling stage burning chassis 208 respectively positioned at cloth section 200, preheating section 201,
Igniting section 202, incineration section 203 and cooling section 204), it is predrying to material progress, after the completion of drying, material transportation to section of lighting a fire
202, start to light a fire to material upper strata, firing temperature is 800-900 DEG C, and the duration of ignition is 3-5 minutes, now, extractor fan 23
Igniting is extracted from the lower section of igniting section 202 and produces imperfect combustion caused flue gas, and is delivered to incineration section 203, makes flue gas two
Secondary burning, meanwhile, igniting section 202 forms subnormal ambient, and the bed of material starts to burn from top to bottom, and material is delivered to incineration section 203, burns
It is 800-1000 DEG C to burn the temperature of section 203, and after the completion of burning, incineration residue is delivered to cooling section 204, and temperature is down to 300-800 DEG C.
After cooling, residue is transported to slag treatment system 3, residue is prepared into haydite or brick, this section of flue gas enters flue gas purification system
4, sequentially enter heat exchanger, cyclone separator, desulfurizing tower, denitrating tower, steam-water separator, active carbon adsorber.Caused by burning
Flue gas exchanges heat into heat exchanger, delivers to cyclone separator by air-introduced machine afterwards and removes flue dust, efficiency of dust collection by mesh bag
More than 98%, the flue gas after dedusting carries out spray sulphur removal into desulfurizing tower, and spray liquid is sodium hydroxide solution, and sodium hydroxide can
With in flue gas sulfur dioxide formed sodium sulfite, and sodium sulfite can by with calcium hydroxide reaction regenerate sodium hydroxide,
So as to realize that sodium hydroxide obtains circular regeneration, sulfur removal effectiveness is up to 60%, while spray liquid can also remove the flue dust of residual；It is de-
Waste gas enters denitrating tower wet denitration after sulphur, by spraying urea liquid and controlling solution PH to reduce the nitrogen oxides in flue gas
Into nitrogen, the purpose of denitration is realized, the method can remove in flue gas more than 80% NOx；Flue gas after denitration is sent into steam-water separation
In device, the water in steam-water separator in flue gas is separated can be used for the preparation of aluminium polychloride after collection；Hereafter, cigarette
Gas the heavy metal and bioxin that may be remained by charcoal absorption removing flue gas, reaches flue gas by active carbon adsorber
Mark.
In specific implementation, first and second batch mixer can use colter batch mixer, and filter press can use plate compression.
Using embodiment 1-4 processing method, and applied to the processing system of embodiment 5, processing system processing is produced
The indices of incineration residue detected, embodiment 1-4 residue can reach following standards, residue moisture content ＜
1%, loss on ignition≤50%.Residue pollutant concentration is referring to table 1, and Hygienic Index is referring to table 2.
The pollutant concentration of table 1
| Sequence number | Item controlled | Limit value/(mg/kg residues) |
| 1 | Total cadmium | ＜ 20 |
| 2 | Total mercury | ＜ 5 |
| 3 | Total lead | ＜ 300 |
| 4 | Total chromium | ＜ 1000 |
| 5 | Total arsenic | ＜ 75 |
| 6 | Total nickel | ＜ 200 |
| 7 | Total zinc | ＜ 4000 |
| 8 | Total copper | ＜ 1500 |
The Hygienic Index of table 2
| Sequence number | Item controlled | Limit value |
| 1 | Excrement colibacillus group bacterium value | <0.01 |
| 2 | Induced worm egg death rate | ＞ 95% |
Claims (10)
1. a kind of method for innocent treatment of domestic sludge refers to domestic sludge is carried out before burning disposal to be dehydrated pretreatment
Processing method, it is characterised in that the dehydration pretreatment includes following two steps：
Step 1：Domestic sludge, lime and aluminium polychloride are mixed in proportion, moisture content is made as 60~65% by being dehydrated
Mud cake；
Step 2：Based on domestic sludge original quality, by the biomass carbon dust for accounting for domestic sludge original quality 1-10% and life is accounted for
Sludge original quality 2-5% chaff shell, mixing sludge is mixed to prepare with step 1 gained mud cake.
2. processing method as claimed in claim 1, it is characterised in that domestic sludge, lime and aluminium polychloride in the step 1
Ratio in mass ratio be 100:1~10:1~6, it is preferred that domestic sludge in the step 1, lime and aluminium polychloride
Ratio is 100 in mass ratio：5：3.
3. processing method as claimed in claim 2, it is characterised in that the aluminium polychloride refers to mass percentage concentration 30%
Polyaluminium aluminum water solution.
4. processing method as claimed in claim 3, it is characterised in that the burning disposal refers to mixing sludge through negative-pressure cyclic
Accumulation of heat CIU burning disposal, the negative-pressure cyclic accumulation of heat CIU refer to using flue gas caused by burning to mixing sludge
Carry out pre-dried CIU.
5. processing method as claimed in claim 3, it is characterised in that after the burning disposal, in addition to gas cleaning processing and
Residue treatment, the gas cleaning processing comprise the following steps：
Step a：Flue gas heat exchange caused by burning, is delivered to by air-introduced machine and flue dust is removed in sack cleaner；
Step b：Waste gas after step a dedustings is subjected to spray sulphur removal, spray liquid is sodium hydroxide solution；
Step c：Waste gas after step b desulfurization is subjected to wet denitration, by spraying urea liquid and controlling solution PH by flue gas
Nitrogen oxides be reduced into nitrogen；
Step d：Flue gas after step c denitrations is sent into steam-water separator, the water in steam-water separator in flue gas is separated
Out, and for the preparation of aluminium polychloride；
Step e：By the flue gas after step d processing by active carbon adsorber, removing flue gas by charcoal absorption may remain
Heavy metal and bioxin, make flue gas up to standard.
6. a kind of innocuity disposal system of domestic sludge, including to domestic sludge be dehydrated the pretreatment system of pretreatment
(1) the negative-pressure cyclic accumulation of heat CIU (2) of burning disposal, slag treatment system (3), are carried out to mixing sludge and flue gas is entered
The flue gas purification system (4) of row gas cleaning processing, it is characterised in that the pretreatment system (1) includes：Lived for mixing
The first batch mixer (13) of sludge, lime and aluminium polychloride, filter press (14) for press filtration sludge, for mix mud cake,
Second batch mixer of biomass carbon and chaff shell, multiple weighing balances (12) and storage bin (11), wherein, the first batch mixer (13), pressure
Filter (14) passes sequentially through conveying arrangement (16) with the second batch mixer (15) and is connected, and first batch mixer (13) is twin shaft spiral shell
Revolve batch mixer or colter batch mixer, second batch mixer (15) is double-shaft spiral batch mixer or colter batch mixer, the press filtration
Machine (14) is steel band type filter press or plate and frame filter press.
7. the innocuity disposal system of domestic sludge as claimed in claim 6, it is characterised in that the domestic sludge it is innoxious
Processing system also includes the central control system that the innocuity disposal system of domestic sludge is monitored and controlled.
8. the innocuity disposal system of domestic sludge as claimed in claim 7, it is characterised in that the negative-pressure cyclic accumulation of heat is burned
System (2), including：There is cloth section (200), preheating section (201), igniting section (202), incineration section (203) and cooling section successively
(204) incinerator (20)；Smoke circulating device (22) above incineration section (203)；Cloth dress above cloth section (200)
Put (21) and positioned at preheating section (201), igniting section (202), incineration section (203) and the extractor fan (23) of cooling, the burning
Device (20) also includes：Preheating cover (206) above preheating section (201), the igniter (205) above igniting section (202), can be
Cloth section (200), preheating section (201), igniting section (202), the burning platform of incineration section (203) and cooling section (204) slidably
Warm-up cycle gas approach (207) on car (208) and preheating cover (206), the import of the warm-up cycle flue gas are used to come from
The entrance of the circulating flue gas of incineration section (203).
9. the innocuity disposal system of domestic sludge as claimed in claim 8, it is characterised in that the smoke circulating device (22)
Including single or multiple independent flue gas covers (22), there is circulating flue gas import (220) and circulating flue gas import in flue gas cover (22)
(221), the extractor fan (23) includes three or more than three independent draught hoods (230), and draught hood is connected with (230)
Exhaust column (231), exhaust column (231) are provided with air pump (232)；Draught hood (230) is with burning below igniting section (202)
First flue gas cover (22) above section (203) is connected, last draught hood (230) below incineration section (203)
It is connected with preheating cover (206), the draught hood (230) below cooling section (204) is connected with flue gas purification system (4).
10. the innocuity disposal system of domestic sludge as claimed in claim 9, it is characterised in that the flue gas purification system (4)
Include heat exchanger, cyclone separator, desulfurizing tower, denitrating tower, steam-water separator, active carbon adsorber successively.
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| PCT/CN2018/100155 WO2019062350A1 (en) | 2017-09-26 | 2018-08-13 | Harmless treatment method and system for domestic sludge |
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Cited By (1)
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| WO2019062350A1 (en) * | 2017-09-26 | 2019-04-04 | 重庆盎瑞悦科技有限公司 | Harmless treatment method and system for domestic sludge |
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