CN109179927A - A kind of method of the circulating processing of excess sludge - Google Patents

A kind of method of the circulating processing of excess sludge Download PDF

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Publication number
CN109179927A
CN109179927A CN201811099471.7A CN201811099471A CN109179927A CN 109179927 A CN109179927 A CN 109179927A CN 201811099471 A CN201811099471 A CN 201811099471A CN 109179927 A CN109179927 A CN 109179927A
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sludge
conditioning
solid product
pyrolysis
dehydration
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CN109179927B (en
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吴彦
平巍
闫彬
付川
夏亚平
潘杰
蓝巧娟
张盼月
钟银海
王茂清
牛文龙
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Chongqing Three Gorges University
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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
    • C02F11/10—Treatment of sludge; Devices therefor by pyrolysis
    • 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
    • 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
    • C02F11/143—Treatment of sludge; Devices therefor by de-watering, drying or thickening with addition of chemical agents using inorganic substances
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W10/00—Technologies for wastewater treatment
    • Y02W10/40—Valorisation of by-products of wastewater, sewage or sludge processing

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Hydrology & Water Resources (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Organic Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Treatment Of Sludge (AREA)

Abstract

A kind of method of the circulating processing of excess sludge is that transition metal element is first added into sludge to be improved as sludge conditioner, sludge after conditioning is carried out dehydrating, then dewatered sludge is pyrolyzed, thermal decomposition product is recycled to be used in sludge conditioning-dehydration-pyrolysis system.Solid product quality after the pyrolysis that the present invention obtains is high, dehydration rate is easy to control, process stabilizing, and effective use is recycled at least 2 years, it is at low cost, sustainability is preferable, meanwhile the pyrolyzing sludge solid product after the conditioning of transition metal conditioner has preferable facilitation in sludge conditioning-each link of dehydration-pyrolysis, improves the systematicness of Treatment of Sludge and disposition, also, generated amounts of hydrogen and sludge organism charcoal quality are better than traditional pyrolyzing sludge technique.In this process, each step pyrolyzing sludge hydrogen output volume accounts for the 70 ~ 80% of total pyro lysis temperature gas, and sludge organism charcoal specific surface area is 50 ~ 80m2/g。

Description

A kind of method of the circulating processing of excess sludge
Technical field
The invention belongs to technical field of environmental management, and in particular to a kind of method of the circulating processing of excess sludge.
Background technique
City excess sludge be municipal sewage plant generate by-product, in recent years, China with the development of economy, There is a sharp increase in output for city excess sludge.Currently, being more than that 80% sludge cannot get appropriate processing and disposition, the random row of sludge Secondary pollution will be caused to water, atmosphere, the soil etc. in environment by putting, meanwhile, also seriously endanger the health of the mankind.Sludge Processing includes the processing of sludge and two stages of disposition of sludge with disposition, in the processing of sludge, with the conditioning of sludge and is taken off Water is as the key link, by improving sludge, to improve the dewatering of sludge；For the disposition rank of sludge Section, the means taken both at home and abroad mainly include sanitary landfills, water body consumption, burning, compost treatment, land use etc., wherein dirty Mud is pyrolyzed while being disposed to sludge, can be recycled the energy and be prepared charcoal, and the big heat of one studied at present is become Point.
However, there is following two about the research of specific resistance to filtration at present: 1, in most of research, promoting The skeleton conditioner of sludge dewatering and the copyrolysis substance for promoting pyrolyzing sludge are allogenic material particle, may improve this The collection difficulty of substance raw material is added a bit；2, using pyrolyzing sludge as the sludge conditioning of target-dehydration-pyrolysis system process still Not formed, i.e. sludge pre-treatment and following resource disposal options disconnects.However, different Opsonizing methods not only to conditioning after Dewatering performance of sludge impacts, and can also impact to sludge chemical ingredient, property and the moisture content of the cake after conditioning, from And the subsequent pyrolysis effect and solid product of sludge are had an impact.Liu Huan et al. has found that the sludge after CaO conditioning can Hydrogen content in sludge pyrolysis gas is improved, while can also reduce HCN and NO in pyrolytic processxRelease, it was found that it is different Dehydration depth is affected to pyrolyzing sludge effect, and the studies above shows to remain influence of the conditioner to pyrolysis in dewatered sludge It is larger, but study in the research established for the purpose of early period is to improve dewatering performance of sludge, and dewatering performance of sludge is best, mud cake Moisture content is minimum not so that pyrolyzing sludge effect is best, i.e., the optimal processing parameter for the purpose of being dehydrated not is final to sludge Pyrolysis is advantageous.If being not only this system a certain stage there are certain substance in sludge conditioning-dehydration-pyrolysis system Product, and object can be participated in as the process of this system, and good facilitation can be played in each link of system, it is right There is innovative significance in Treatment of Sludge and disposition and recycling sludge.
Currently, there is no the circulating processing of the excess sludge of set of system and disposal of resources method, that is, it is de- after improving The solid product of sewage sludge pyrolysis not only can be used as the skeleton conditioner for promoting sludge dewatering, but also can be as promotion pyrolyzing sludge Catalyst, and there is certain cycle characteristics, cycle applications are into sludge conditioning-dehydration-pyrolysis system technique.At present apparently, Treatment process still remain pyrolysis it is inefficient, the solid product quality obtained after pyrolysis is low, cannot achieve cycling and reutilization, i.e., Pyrolysis efficiency after making cycling and reutilization will be greatly reduced, and product phosphorus content is low after pyrolysis, and hardness is low frangible, in dehydration link effect Fruit is undesirable, influences the regulation of dehydration rate, causes technological effect unstable；And the sludge conditioning agent in solid product is not easy cruelly It is exposed at surface, majority, which is wrapped in inside sludge, can not play the role of pyrolysis catalytic, recycle to limit, even if circulation It is pyrolyzed efficiency after utilization to be significantly reduced, can not recycle or cannot achieve and recycle etc. technical problems for a long time and be badly in need of solution Certainly.
Summary of the invention
The purpose of the present invention is to provide a kind of methods of the circulating processing of excess sludge.
The purpose of the present invention is what is realized by following technical measures:
A kind of method of the circulating processing of excess sludge, it is characterised in that: it is that transition metal element is first added into sludge to make It is improved for sludge conditioner, the sludge after conditioning is carried out dehydrating, be then pyrolyzed dewatered sludge, it will Thermal decomposition product is recycled to be used in sludge conditioning-dehydration-pyrolysis system.
Further, the method for the circulating processing of a kind of excess sludge, it is characterised in that: described that transition gold is added into sludge Belonging to element to carry out conditioning step as sludge conditioner is that 10% ~ 14% mistake of mud dry weight quality is added into former excess sludge Metallic element compound is crossed as sludge conditioner, first quickly 0.5 ~ 2min of stirring, quick speed of agitator are 300 ~ 500r/min, Then 5 ~ 8min is being mixed slowly, mixing slowly revolving speed is 30 ~ 80r/min, is improved sludge.
Further, a kind of method of the circulating processing of excess sludge, it is characterised in that: the transition metal element compound It is made of potassium ferrate and ferric trichloride, mixed mass ratio is 1:8 ~ 1:5.
Further, the method for the circulating processing of a kind of excess sludge, it is characterised in that: the dehydration is will to improve Sludge afterwards carries out filter-press dehydration, and the dewatering pressure is 0.4 ~ 0.7 MPa, and dewatering time is 5 ~ 10min, guarantees filter-press dehydration Sludge cake moisture afterwards is 60% ~ 80%.
Further, the method for the circulating processing of a kind of excess sludge, it is characterised in that: the pyrolysis step is first in pipe Formula electric furnace is passed through argon gas, then electric tube furnace is heated to 300 ~ 400 DEG C, then by ventilation 5 ~ stop ventilation after ten minutes Dewatered sludge is added, in 400 ~ 700 DEG C of 20 ~ 40min of pyrolysis, while recycling pyrolysis gas, wait be pyrolyzed after recycle it is solid Phase product.
Further, the method for the circulating processing of a kind of excess sludge, it is characterised in that: the thermal decomposition product is recycled to be used in It is to put into the solid product after pyrolysis in new sludge in sludge conditioning-dehydration-pyrolysis system, dosage is new dirt The 60 ~ 80% of mud dry weight, while then 6% ~ 10% transition metal for putting into gross dry weight quality repeats to take off as sludge conditioner Water treatment steps, pyrolysis step are solid product of getting back；Solid product is put into new sludge again, dosage is new Mud dry weight 60 ~ 80%, while then 2% ~ 6% transition metal for putting into gross dry weight quality is repeated as sludge conditioner Dehydration process steps, pyrolysis step are solid product of getting back；Solid product is put into new sludge again, dosage is The 60 ~ 80% of new mud dry weight, then repeatedly dehydration, pyrolysis step are solid product of getting back, i.e. completion sludge circulation Formula processing.
Specifically, the method for the circulating processing of a kind of excess sludge, which is characterized in that it is to include the following steps to realize :
(1) 10% ~ 14% transition metal element compound of mud dry weight quality is added into former excess sludge as sludge tune Agent is managed, first quickly 0.5 ~ 2min of stirring, quick speed of agitator are 300 ~ 500r/min, are then mixing slowly 5 ~ 8min, at a slow speed Speed of agitator is 30 ~ 80r/min, is improved sludge；The transition metal element compound is by potassium ferrate and trichlorine Change iron composition, mixed mass ratio is 1:8 ~ 1:5；
It (2) is that sludge after improving carries out filter-press dehydration, dewatering pressure is 0.4 ~ 0.7MPa, and dewatering time is 5 ~ 10 min, Sludge cake moisture after guaranteeing filter-press dehydration is 60% ~ 80%；
(3) by pyrolyzing sludge solid product circulating and recovering described in step (2) into sludge conditioning, dosage is that new activity is dirty The 60 ~ 80% of mud dry weight, while 6% ~ 10% transition metal element compound of mud dry weight quality is added as sludge conditioner It is improved, the sludge after conditioning is subjected to filter-press dehydration, dewatered sludge cake moisture content is maintained at 50 ~ 70%, repeats to walk Suddenly (2), wait be pyrolyzed after recycle solid product；
(4) by pyrolyzing sludge solid product circulating and recovering described in step (3) into sludge conditioning, dosage is 60 ~ 80% sludge Dry weight, while 2% ~ 6% transition metal element compound for adding mud dry weight quality is improved as sludge conditioner, it will Sludge after conditioning carries out filter-press dehydration, and dewatered sludge cake moisture content is maintained at 50 ~ 70%, repeats step (2), to heat Solid product is recycled after solution；The transition metal element compound is made of potassium ferrate and ferric trichloride, mixing Mass ratio be 1:8 ~ 1:5；
(5) by pyrolyzing sludge solid product circulating and recovering described in step (4) into sludge conditioning, dosage is 60 ~ 80% sludge Dry weight no longer adds transition metal element compound sludge conditioner, and the sludge after conditioning is carried out filter-press dehydration, dewatered Sludge cake moisture content is maintained at 50 ~ 70%, repeats step (2), wait be pyrolyzed after recycle solid product；
(6) pyrolysis solid product circulation is used in sludge conditioning-dehydration-pyrolytic process by circulating repetition step (5).
The present invention have it is following the utility model has the advantages that
Solid product quality after the pyrolysis that the present invention obtains is high, and dehydration rate is easy to control, process stabilizing, during recycling Pyrolysis gas producing efficiency be stably held in 350 ~ 500ml/g dewatered sludge (mark dry state), and effectively benefit is recycled at least 2 years With, it is at low cost, sustainability is preferable, meanwhile, the pyrolyzing sludge solid product after the conditioning of transition metal conditioner is in sludge conditioning- Each link of dehydration-pyrolysis has preferable facilitation, improves the systematicness of Treatment of Sludge and disposition, also, generated hydrogen Tolerance and sludge organism charcoal quality are better than traditional pyrolyzing sludge technique.In this process, each step pyrolyzing sludge is produced Hydrogen amount volume accounts for the 70 ~ 80% of total pyro lysis temperature gas, and sludge organism charcoal specific surface area is 50 ~ 80m2/g.Operation of the present invention method letter It is single, practical, it is of great significance for solving recycling sludge and sustainable processing handling problems.
Specific embodiment
The present invention is specifically described below by embodiment, it is necessary to which indicated herein is that following embodiment is only used In invention is further explained, it should not be understood as limiting the scope of the invention, without departing substantially from spirit of that invention In the case where essence, to modifications or substitutions made by the method for the present invention, step or condition, all belong to the scope of the present invention.
Transition metal element sludge conditioner used in the present embodiment is industrial goods, surplus in embodiment 1, embodiment 2 Remaining sludge is to be derived from Wanzhou in Chongqing bright mirror beach sewage treatment plant, and raw sewage moisture content is 98.9 ~ 99.5%.
Embodiment 1
(1) transition metal element compound of 120g/kg mud dry weight is added into former excess sludge, mixed mass ratio is 1:6 is sufficiently stirred, and improves sludge；
(2) sludge after conditioning is subjected to filter-press dehydration, dewatered sludge cake moisture content is maintained at 78%；It will be dewatered Sludge is put into electric tube furnace, is first passed through 6 minutes argon gas, stops ventilation, electric tube furnace is first then warming up to 400 DEG C, then Dewatered sludge is added, in 600 DEG C of 20 min of pyrolysis, while recycling pyrolysis gas, wait be pyrolyzed after recycle solid product, Pyrolysis gas producing efficiency is stably held in 375ml/g dewatered sludge (marking dry state), and wherein hydrogen volume accounts for total pyro lysis temperature gas 72.3%；
(3) by pyrolyzing sludge solid product circulating and recovering described in step (2) into sludge conditioning, dosage is dry for 70% sludge Weight, while the transition metal element compound of 75 g/kg mud dry weights is added, mixed mass ratio is 1:6, after conditioning Sludge carries out filter-press dehydration, and dewatered sludge cake moisture content is maintained at 58%, repeats step (2), wait be pyrolyzed after recycle Solid product, pyrolysis gas producing efficiency are stably held in 388 ml/g dewatered sludges (marking dry state), and wherein hydrogen volume accounts for total heat Solve the 72.9% of gas；
(4) by pyrolyzing sludge solid product circulating and recovering described in step (3) into sludge conditioning, dosage is dry for 70% sludge Weight, while the transition metal element compound of 35g/kg mud dry weight is added, mixed mass ratio is 1:6, after conditioning Sludge carries out filter-press dehydration, and dewatered sludge cake moisture content is maintained at 55%, repeats step (2), wait be pyrolyzed after recycle Solid product, pyrolysis gas producing efficiency are stably held in 389ml/g dewatered sludge (marking dry state), and wherein hydrogen volume accounts for total heat Solve the 73.3% of gas；
(5) by pyrolyzing sludge solid product circulating and recovering described in step (4) into sludge conditioning, dosage is dry for 70% sludge Weight, no longer adds transition metal element compound, the sludge after conditioning is carried out filter-press dehydration, dewatered sludge cake is aqueous Rate is maintained at 55%, repeats step (2), wait be pyrolyzed after recycle solid product, pyrolysis gas producing efficiency is stably held in 388ml/g dewatered sludge (marks dry state), and wherein hydrogen volume accounts for the 72.7% of total pyro lysis temperature gas；
(6) pyrolysis solid product circulation is used in sludge conditioning-dehydration-pyrolytic process by circulating repetition step (5).
Acquired results are as follows: each step pyrolysis hydrogen output volume ratio averagely reaches 72.8%, and sludge organism charcoal specific surface area is flat Reach 50.032m2/g。
1 solid product of embodiment has been recycled 2 years, and duration is good at present, can continue to use.
Embodiment 2:
(1) transition metal element compound of 105g/kg mud dry weight is added into former excess sludge, mixed mass ratio is 1:8 is sufficiently stirred, and improves sludge；
(2) sludge after conditioning is subjected to filter-press dehydration, dewatered sludge cake moisture content is maintained at 72%；It will be dewatered Sludge is put into electric tube furnace, is first passed through 10 minutes argon gas, stops ventilation, electric tube furnace is first warming up to 400 DEG C, is then added Dewatered sludge recycles pyrolysis gas in 500 DEG C of pyrolysis 30min, wait be pyrolyzed after recycle solid product, pyrolysis produces Gas efficiency is stably held in 403ml/g dewatered sludge (marking dry state), and wherein hydrogen volume accounts for the 75.8% of total pyro lysis temperature gas；
(3) by pyrolyzing sludge solid product circulating and recovering described in step (2) into sludge conditioning, dosage is dry for 75% sludge Weight, while the transition metal element compound of 70g/kg mud dry weight is added, mixed mass ratio is 1:8, after conditioning Sludge carries out filter-press dehydration, and dewatered sludge cake moisture content is maintained at 65%, repeats step (2), wait be pyrolyzed after recycle Solid product, pyrolysis gas producing efficiency are stably held in 440 ml/g dewatered sludges (marking dry state), and wherein hydrogen volume accounts for total heat Solve the 74.7% of gas；
(4) by pyrolyzing sludge solid product circulating and recovering described in step (3) into sludge conditioning, dosage is dry for 75% sludge Weight, while the transition metal element compound of 30g/kg mud dry weight is added, mixed mass ratio is 1:8, after conditioning Sludge carries out filter-press dehydration, and dewatered sludge cake moisture content is maintained at 60%, repeats step (2), wait be pyrolyzed after recycle Solid product, pyrolysis gas producing efficiency are stably held in 437ml/g dewatered sludge (marking dry state), and wherein hydrogen volume accounts for total pyro lysis temperature The 75.4% of gas；
(5) by pyrolyzing sludge solid product circulating and recovering described in step (4) into sludge conditioning, dosage is dry for 75% sludge Weight, no longer adds transition metal element compound, the sludge after conditioning is carried out filter-press dehydration, dewatered sludge cake is aqueous Rate is maintained at 60%, repeats step (2), wait be pyrolyzed after recycle solid product, pyrolysis gas producing efficiency is stably held in 430ml/g dewatered sludge (marks dry state), and wherein hydrogen volume accounts for the 76.1% of total pyro lysis temperature gas；
(6) pyrolysis solid product circulation is used in sludge conditioning-dehydration-pyrolytic process by circulating repetition step (5).
Acquired results are as follows: each step pyrolysis hydrogen output volume ratio averagely reaches 75.5%, and sludge organism charcoal specific surface area is flat Reach 56.064 m2/g。
2 solid product of embodiment has been recycled 2 years, and duration is good at present, can continue to use.

Claims (7)

1. a kind of method of the circulating processing of excess sludge, it is characterised in that: it is that transition metal element is first added into sludge It is improved as sludge conditioner, the sludge after conditioning is carried out dehydrating, be then pyrolyzed dewatered sludge, Thermal decomposition product is recycled to be used in sludge conditioning-dehydration-pyrolysis system.
2. the method for the circulating processing of excess sludge as described in claim 1, it is characterised in that: described to be added into sludge Crossing metallic element and carrying out conditioning step as sludge conditioner is that the 10% ~ 14% of mud dry weight quality is added into former excess sludge Transition metal element compound as sludge conditioner, first quickly 0.5 ~ 2min of stirring, quick speed of agitator are 300 ~ 500r/ Then min is mixing slowly 5 ~ 8min, mixing slowly revolving speed is 30 ~ 80r/min, improves sludge.
3. the method for the circulating processing of excess sludge as claimed in claim 2, it is characterised in that: the transition metal element It closes object to be made of potassium ferrate and ferric trichloride, mixed mass ratio is 1:8-1:5.
4. the method for the circulating processing of excess sludge as claimed in claim 3, it is characterised in that: the dehydration, be by Sludge after conditioning carries out filter-press dehydration, and the dewatering pressure is 0.4 ~ 0.7MPa, and dewatering time is 5 ~ 10 min, guarantees filters pressing Dewatered sludge cake moisture is 60% ~ 80%.
5. the method for the circulating processing of excess sludge as claimed in claim 4, it is characterised in that: the pyrolysis step is first It is passed through argon gas in electric tube furnace, then electric tube furnace is heated to 300 ~ 400 DEG C by ventilation 5 ~ stop ventilation after ten minutes, Then dewatered sludge is added, in 400 ~ 700 DEG C of 20 ~ 40 min of pyrolysis, while pyrolysis gas is recycled, after being pyrolyzed Recycle solid product.
6. the method for the circulating processing of excess sludge as claimed in claim 5, it is characterised in that: the thermal decomposition product is recycled back to For in sludge conditioning-dehydration-pyrolysis system, being to put into the solid product after pyrolysis in new sludge, dosage is new Mud dry weight 60 ~ 80%, while then 6% ~ 10% transition metal for putting into gross dry weight quality is weighed as sludge conditioner Multiple dehydration process steps, pyrolysis step are solid product of getting back；Solid product is put into new sludge again, dosage It is the 60 ~ 80% of new mud dry weight, while puts into 2% ~ 6% transition metal of gross dry weight quality as sludge conditioner, then Repeat dehydration process steps, pyrolysis step is solid product of getting back；Solid product is put into new sludge, is added again Amount is the 60 ~ 80% of new mud dry weight, and then repeatedly dehydration, pyrolysis step are solid product of getting back, i.e. completion sludge Circulating processing.
7. a kind of method of the circulating processing of excess sludge, which is characterized in that it includes the following steps to realize:
(1) 10% ~ 14% transition metal element compound of mud dry weight quality is added into former excess sludge as sludge tune Agent is managed, first quickly 0.5 ~ 2min of stirring, quick speed of agitator are 300 ~ 500r/min, are then mixing slowly 5 ~ 8min, at a slow speed Speed of agitator is 30 ~ 80r/min, is improved sludge；The transition metal element compound is by potassium ferrate and trichlorine Change iron composition, mixed mass ratio is 1:8 ~ 1:5；
It (2) is that sludge after improving carries out filter-press dehydration, dewatering pressure is 0.4 ~ 0.7MPa, and dewatering time is 5 ~ 10 min, Sludge cake moisture after guaranteeing filter-press dehydration is 60% ~ 80%；
(3) by pyrolyzing sludge solid product circulating and recovering described in step (2) into sludge conditioning, dosage is that new activity is dirty The 60 ~ 80% of mud dry weight, while 6% ~ 10% transition metal element compound of mud dry weight quality is added as sludge conditioner It is improved, the sludge after conditioning is subjected to filter-press dehydration, dewatered sludge cake moisture content is maintained at 50 ~ 70%, repeats to walk Suddenly (2), wait be pyrolyzed after recycle solid product；
(4) by pyrolyzing sludge solid product circulating and recovering described in step (3) into sludge conditioning, dosage is 60 ~ 80% dirty Mud dry weight, while 2% ~ 6% transition metal element compound for adding mud dry weight quality is improved as sludge conditioner, Sludge after conditioning is subjected to filter-press dehydration, dewatered sludge cake moisture content is maintained at 50 ~ 70%, it repeats step (2), to Solid product is recycled after pyrolysis；The transition metal element compound is made of potassium ferrate and ferric trichloride, is mixed The mass ratio of conjunction is 1:8 ~ 1:5；
(5) by pyrolyzing sludge solid product circulating and recovering described in step (4) into sludge conditioning, dosage is 60 ~ 80% sludge Dry weight no longer adds transition metal element compound sludge conditioner, and the sludge after conditioning is carried out filter-press dehydration, dewatered Sludge cake moisture content is maintained at 50 ~ 70%, repeats step (2), wait be pyrolyzed after recycle solid product；
(6) pyrolysis solid product circulation is used in sludge conditioning-dehydration-pyrolytic process by circulating repetition step (5).
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CN111018309A (en) * 2020-01-15 2020-04-17 同济大学 Efficient sludge energy treatment method based on hydrothermal pretreatment
CN112121761A (en) * 2020-09-03 2020-12-25 北京城市排水集团有限责任公司 Sludge carbon-based adsorption material and preparation method thereof
CN113501647A (en) * 2021-07-29 2021-10-15 华中科技大学 Method for converting water-soluble humic acid by directionally catalyzing sludge pyrolysis oil
CN114044620A (en) * 2021-11-05 2022-02-15 同济大学 Method for preparing sludge conditioner by using water supply sludge and application thereof

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CN115814760A (en) * 2023-01-09 2023-03-21 重庆三峡学院 Preparation and application of sludge biochar

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