CN115155586A - Iron-based sludge coal, preparation method and application thereof - Google Patents

Iron-based sludge coal, preparation method and application thereof Download PDF

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CN115155586A
CN115155586A CN202210766446.XA CN202210766446A CN115155586A CN 115155586 A CN115155586 A CN 115155586A CN 202210766446 A CN202210766446 A CN 202210766446A CN 115155586 A CN115155586 A CN 115155586A
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sludge
iron
persulfate
preparation
complexing
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张欣
张洪涛
洪毅
杨垚磊
蔡驰
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Zhejiang Lover Health Science and Technology Development Co Ltd
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Zhejiang Lover Health Science and Technology Development Co Ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J23/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
    • B01J23/70—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of the iron group metals or copper
    • B01J23/74—Iron group metals
    • B01J23/745—Iron
    • 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
    • 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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  • Engineering & Computer Science (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Materials Engineering (AREA)
  • General Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Hydrology & Water Resources (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Treatment Of Sludge (AREA)

Abstract

The invention discloses iron-based sludge carbon, a preparation method and application thereof, relating to the technical field of sludge treatment, wherein the preparation method comprises the following steps: (1) Adding a complexing chelating agent and ferrite into the residual sludge, then adding persulfate, and performing suction filtration to obtain a sludge cake containing iron; (2) And drying, crushing, sieving and pyrolyzing the iron-containing sludge cake to obtain the iron-based sludge soil. The iron-based sludge carbon is used for sludge dehydration, can effectively realize sludge reduction, improves sludge dehydration performance, can greatly reduce sludge cake outward transportation amount and sludge conditioner cost of a sewage plant, and has great environmental significance.

Description

Iron-based sludge coal, preparation method and application thereof
Technical Field
The invention relates to the technical field of sludge treatment, in particular to iron-based sludge carbon, a preparation method and application thereof.
Background
With the rapid development of urbanization and industrialization, the discharge amount of urban domestic sewage and industrial wastewater is increased unprecedentedly. The activated sludge method treatment process is adopted in most of cities and towns and most of industrial sewage treatment plants, so that the sludge production is greatly increased. The sludge has complex components, presents the characteristics of colloidal floc, has high hydrophilicity and water retention and extremely poor self-dehydration performance, and can realize effective mud-water separation only by necessary pretreatment measures. No matter the sludge is transported, or the treatment processes such as landfill, aerobic fermentation, incineration and the like have strict requirements on the water content of the sludge. The water content is generally required to be controlled to be about 80 percent when the sludge is transported; the water content of sanitary landfill sludge specified in GB/T23485-2009 (GB/T23485-2009) for mixed landfill of sludge disposal in urban sewage treatment plants is required to be lower than 60 percent; the upper limit of the water content suitable for the aerobic fermentation of the sludge is 50 to 60 percent; the upper limit of the water content of the sludge in the incinerator for stable combustion is 60%. The sludge of the original sewage plant has higher water content (more than 95 percent), so that the volume of the sludge-water mixture is large, the treatment difficulty and cost of the sludge are improved, and the treatment efficiency of the sludge is severely restricted. Therefore, the dehydration of the sludge is a necessary prerequisite for the volume reduction of the sludge and is a primary step for the subsequent safe treatment and recycling of the sludge.
Advanced oxidation technology, characterized by the generation of strong oxidizing free radicals, such as hydroxyl radical (. OH), sulfate radical (SO) 4 ·- ) And the like, a novel oxidation technology for converting organic matters which are difficult to degrade into low-harm or harmless small molecular substances. In recent years, SO has been generated by activating Persulfate (PS) 4 ·- Becomes a research hotspot in the field of deep dehydration of the sludge. Persulfate ion (S) generated by PS ionization in water 2 O 8 2- ) The reaction rate is low under normal conditions, and the oxidation effect is not obvious. But can generate a large amount of SO after being catalyzed and activated by transition metal, light, heat, active carbon and the like 4 ·- The oxidation potential of the composite material reaches 2.5-3.1V, which is similar to OH oxidation potential but more stable than OH oxidation potential, and the composite material is used as a Fenton-like oxidation technology to obviously improve the sludge dewatering performance.
Dewatered sludge based on advanced oxidation conditioning is a by-product produced in the wastewater treatment process and is generally treated as waste for landfill disposal. Due to the large workload and high cost of sludge post-treatment and the potential problem of secondary pollution in the traditional landfill mode, resource utilization is an important research direction for treatment and disposal of dewatered sludge. At present, the resource utilization of the dewatered sludge mainly comprises acid dissolution recycling of iron salt and utilization of the iron salt as a building material, the resource utilization rate is low, the cost is high, and the treatment and disposal of the dewatered sludge still belong to the environmental problems to be solved urgently.
Disclosure of Invention
Excess sludge belongs to municipal and industrial solid waste, and sludge conditioning is required due to high water content. The Fenton-like advanced oxidation method is used for conditioning the sludge, can deeply dehydrate the sludge, not only comprises free water, but also comprises combined water released by breaking sludge flocs, but also inevitably generates a large amount of iron-containing sludge. The invention aims to provide iron-based sludge peat, a preparation method and application thereof, wherein a combined technical process of the iron-based sludge peat, persulfate and ferric salt flocculant is adopted, sludge reduction is effectively realized, the sludge dewatering performance is improved, meanwhile, the sludge cake disposal problem at the tail end of the existing sludge treatment disposal technology can be effectively solved while deep sludge dewatering is realized, and the persulfate catalyst which can be recycled for sludge oxidation conditioning is formed by utilizing the iron-containing sludge cake, so that automatic iron load modification of the sludge peat is realized. The proportion of the iron-containing peat and the persulfate is optimized, so that the process has a better sludge conditioning effect. The process provides a resource utilization way for the iron-containing sludge, and provides an activating agent with low price and good efficiency for the persulfate advanced oxidation technology.
In order to achieve the purpose, the invention provides the following scheme:
the invention provides a preparation method of iron-based sludge coal, which comprises the following steps:
(1) Adding a complexing chelating agent and ferrous salt into the residual sludge, then adding persulfate, and performing suction filtration to obtain a sludge cake containing iron;
(2) And drying, crushing, sieving and pyrolyzing the iron-containing sludge cake to obtain the iron-based sludge coal.
The iron-based sludge soil is prepared based on conditioned sludge. The sludge conditioning is a necessary link for sludge dewatering, and the generated dewatered sludge must be reasonably treated, so the invention firstly prepares the iron-based modified carbon, uses the iron-based modified carbon as a catalyst of persulfate, and then is used for sludge conditioning, can realize closed circulation of the sludge, does not generate waste sludge, and simultaneously realizes value increment of the sludge.
The improvement in sludge dewatering performance is marked by a decrease in specific resistance. The iron-based modified carbon and the persulfate are independently used for conditioning the sludge, and the sludge dewatering performance can be only improved to a certain extent, so that the dewatering performance is deeply improved by adding the ferric salt flocculating agent in the sludge conditioning, and meanwhile, the other function of the ferric salt is to supply iron on the iron-based modified carbon, so that the continuous adding of the ferric salt flocculating agent can be reduced.
Further, in the step (1), preferably, a complexing chelating agent and a ferrous salt are added and then reacted for 10min, and preferably, a persulfate is added and then reacted for 10min.
Further, the complexing and chelating agent of step (1) comprises one or more of tartaric acid, citric acid, oxalic acid, tannic acid and disodium Ethylenediaminetetraacetate (EDTA), preferably oxalic acid.
Further, the persulfate is sodium persulfate or potassium persulfate.
Further, the adding amount of the ferrous salt in the step (1) is 1-3 mmol/g and the adding amount of the persulfate is 1-2 mmol/g based on volatile suspended matters (VSS) in the excess sludge.
Further, the mol ratio of the complexing and chelating agent to the ferrous salt in the step (1) is 0.01-0.1.
Further, the pyrolysis in the step (2) is carried out in a nitrogen or inert gas protective atmosphere, preferably in a nitrogen atmosphere, with a nitrogen flow rate of 100mL/min and a temperature rise rate of 10 ℃/min.
Further, the pyrolysis temperature in the step (2) is 400-800 ℃, and the pyrolysis retention time is 40-80 min.
Further, the drying temperature in the step (2) is 105 ℃, the drying time is 4 hours, and the mixture is crushed and sieved by a 80-mesh sieve.
The invention also provides the iron-based sludge coal prepared by the preparation method.
The invention also provides application of the iron-based sludge peat as a sludge composite conditioner of a Fenton-like flocculant in sludge dewatering.
The invention conditions the sludge by using Fenton-like oxidation and ferric salt flocculation, on one hand, the structure of the sludge can be changed by using the Fenton-like oxidation of iron-based sludge carbon catalysis PS, and bound water in cells and on the surface of extracellular polymers is released, so that the dehydration performance of the sludge is obviously improved; in addition, strong flocculation of ferric salt is further utilized to flocculate the oxidized small and dispersed sludge particles, thereby improving solid-liquid separation of the sludge and increasing iron element supply in the circulating sludge coal. In conclusion, the invention utilizes the synergistic effect of the iron-based sludge peat, the persulfate and the ferric salt flocculant in the sludge dehydration process of the iron-based sludge peat, and can obviously improve the sludge dehydration performance, form a better sludge form and improve the effect of the subsequent treatment and disposal of the sludge. The realization of the route can greatly reduce the sludge cake outward transportation amount and the sludge conditioner cost of the sewage plant, and has great environmental significance.
Further, the specific application method is as follows:
compounding the iron-based peat and persulfate, adding the mixture into sludge, adding ferric salt for coagulation assistance, stirring, standing and carrying out suction filtration.
Further, the ferric salt auxiliary agent comprises ferric chloride (FeCl) 3 ) Ferrous sulfate, poly (ferric chloride), poly (ferric sulfate), preferably FeCl 3 . The addition amount of the ferric salt auxiliary agent is 0.06-0.37 mmol/g VSS.
Furthermore, the addition amount of the iron-based sludge coal is 5-70% of the dry weight (DS) of the sludge.
Further, the addition amount of the persulfate is 0.08 to 0.25mmol/g VSS.
The invention discloses the following technical effects:
the iron-based sludge coal is obtained by dehydrating and pyrolyzing iron-containing excess sludge obtained by using ferrous salt participating advanced oxidation technology and ferric salt flocculating agent (comprising ferrous salt and ferric salt). According to the invention, the sludge is conditioned by Fenton-like oxidation and then flocculation of multivalent ferric salt, so that on one hand, the Fenton-like oxidation of persulfate under the catalysis of iron-based sludge carbon prepared from iron-containing sludge is utilized to dissolve and break microbial cells and extracellular polymers in the sludge, the structure of the sludge is changed, bound water in the cells and on the surfaces of the extracellular polymers is released, and the dehydration performance of the sludge is obviously improved; on the other hand, the strong flocculation of iron salt is further utilized to flocculate the oxidized small and dispersed sludge particles, thereby improving the solid-liquid separation of the sludge and increasing the iron element supply in the circulating sludge carbon.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
FIG. 1 is a schematic view of the preparation and recycling process of the iron-based sludge soil coal of the present invention;
fig. 2 is an XRD pattern of the iron-based sludge peat of example 1;
FIG. 3 is SEM photograph (a 3,000X, b 10,000X) and EDS photograph (c) of the iron-based sludge soil in example 1.
Detailed Description
Reference will now be made in detail to various exemplary embodiments of the invention, the detailed description should not be construed as limiting the invention but as a more detailed description of certain aspects, features and embodiments of the invention.
It is to be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. Further, for numerical ranges in this disclosure, it is understood that each intervening value, between the upper and lower limit of that range, is also specifically disclosed. Every intervening value, to the extent any stated or intervening value in a stated range, and every other stated or intervening value in that stated range, is encompassed within the invention. The upper and lower limits of these smaller ranges may independently be included or excluded in the range.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Although only preferred methods and materials are described herein, any methods and materials similar or equivalent to those described herein can be used in the practice or testing of the present invention. All documents mentioned in this specification are incorporated herein by reference to disclose and describe the methods and/or materials in connection with which the documents are cited. In case of conflict with any incorporated document, the present specification will control.
It will be apparent to those skilled in the art that various modifications and variations can be made in the specific embodiments of the present disclosure without departing from the scope or spirit of the disclosure. Other embodiments will be apparent to those skilled in the art from consideration of the specification. The description and examples are intended to be illustrative only.
As used herein, the terms "comprising," "including," "having," "containing," and the like are open-ended terms that mean including, but not limited to.
The preparation and recycling process of the iron-based sludge coal is schematically shown in figure 1.
The embodiment of the invention provides a preparation method of iron-based sludge soil, which comprises the following steps:
(1) Adding a complexing chelating agent and ferrite into the residual sludge, then adding persulfate, and performing suction filtration to obtain a sludge cake containing iron;
(2) And drying, crushing, sieving and pyrolyzing the iron-containing sludge cakes to obtain the iron-based sludge soil.
In some embodiments of the present invention, the step (1) is preferably performed for 10min after adding the complexing and chelating agent and the ferrous salt, and preferably for 10min after adding the persulfate.
In some embodiments of the invention, the complexing and chelating agent of step (1) comprises one or more of tartaric acid, citric acid, oxalic acid, tannic acid and EDTA, preferably oxalic acid.
In some embodiments of the invention, the persulfate salt is sodium persulfate or potassium persulfate.
In some embodiments of the invention, the addition amount of the complexing and chelating agent in the step (1) is 1-3 mmol/g and the addition amount of the persulfate is 1-2 mmol/g based on volatile suspended matters (VSS) in the excess sludge.
In some embodiments of the present invention, the molar ratio of the complexing chelating agent to the ferrous salt in step (1) is 0.01 to 0.1.
In some embodiments of the present invention, the pyrolysis in step (2) is performed under a nitrogen or inert gas atmosphere, preferably under a nitrogen atmosphere, with a nitrogen flow rate of 100mL/min and a temperature rise rate of 10 ℃/min.
In some embodiments of the invention, the pyrolysis temperature in step (2) is 400 to 800 ℃ and the pyrolysis residence time is 40 to 80min.
In some embodiments of the invention, the drying temperature of step (2) is 105 ℃, the drying time is 4 hours, and the mixture is ground and sieved by a 80-mesh sieve.
The embodiment of the invention also provides the iron-based sludge soil prepared by the preparation method.
The embodiment of the invention also provides application of the iron-based sludge peat as a Fenton-flocculant-like sludge composite conditioner in sludge dewatering.
In some embodiments of the invention, the specific application method is as follows:
compounding the iron-based sludge carbon and persulfate, adding the mixture into sludge, adding ferric salt for coagulation assistance, stirring, standing and carrying out suction filtration.
In some embodiments of the invention, the ferric salt adjuvant comprises ferric chloride (FeCl) 3 ) Ferrous sulfate, poly ferric chloride, poly ferric sulfate, preferably FeCl 3 . The addition amount of the ferric salt auxiliary agent is 0.06-0.37 mmol/g VSS.
In some embodiments of the invention, the iron-based sludge coal is added in an amount of 5 to 70% of the dry weight (DS) of the sludge, and the term "dry weight" in the present invention refers to the dry basis mass of the sludge.
In some embodiments of the invention, the persulfate is added in an amount of 0.08 to 0.25mmol/gVSS.
Example 1
(1) The water content of the residual sludge taken from a secondary sedimentation tank of a certain papermaking wastewater treatment plant is 9807%, sludge specific resistance of 2.13X 10 12 m/kg；
(2) Oxalic acid and FeSO in a molar ratio of 0.02 at room temperature 4 ·7H 2 O (1.5 mmol/g VSS (volatile suspended matter)) is added into the sludge, the sludge is placed in a stirrer at 150rpm and stirred for 10min, then 1.2mmol/g VSS sodium persulfate is added, the mixture reacts at the stirring speed of 150rpm for 10min, and the dehydrated iron-containing sludge cake is obtained after vacuum filtration.
(3) Naturally air drying and crushing the dewatered sludge cake containing iron, drying for 4 hours at 105 ℃, crushing and sieving by a 80-mesh sieve; and (3) putting the crushed sludge into a tube furnace, carrying out pyrolysis in a nitrogen atmosphere, wherein the pyrolysis temperature is 800 ℃, the nitrogen flow rate is 100mL/min, the heating rate is 10 ℃/min, the pyrolysis retention time is 80min, and the iron-based sludge obtained after cooling is characterized in phase and morphology, wherein the XRD (X-ray diffraction) diagram of the iron-based sludge in the embodiment is shown in figure 2, and the SEM (a 3,000 x, b 10,000 x) and EDS (E-Des) diagram (c) are shown in figure 3.
(4) The sludge was added with 10% DS iron-based sludge coal, stirred for 10min at 350rpm in a stirrer, and further added with 0.16mmol/g VSS sodium persulfate, and stirred for 10min at 150 rpm. Then, feCl was added at 0.22mmol/g VSS 3 The mixture was stirred at 150rpm for 5min, and the change in the sludge dewatering performance before and after the reaction was measured by the sludge Specific Resistance (SRF). The results showed that the SRF decreased to 0.25X 10 12 m/kg, and the water content of the treated sludge is 77.83 percent.
Example 2
(1) The residual sludge from the secondary sedimentation tank of a certain municipal sewage treatment plant has the sludge water content of 98.09 percent and the sludge specific resistance of 2.11 multiplied by 10 12 m/kg；
(2) Citric acid and FeSO in a molar ratio of 0.1 at room temperature 4 ·7H 2 O (1.5 mmol/gVSS) is added into the sludge, the mixture is placed in a stirrer with 150rpm and stirred for 10min, then sodium persulfate with 1.2mmol/g VSS is added to react for 10min with the speed of 150rpm, and the dehydrated iron-containing sludge cake is obtained after vacuum filtration.
(3) Naturally air drying and crushing the dewatered sludge cake containing iron, drying for 4 hours at 105 ℃, crushing and sieving by a 80-mesh sieve; and (3) putting the crushed sludge into a tube furnace, carrying out pyrolysis in a nitrogen atmosphere, wherein the pyrolysis temperature is 400 ℃, the nitrogen flow rate is 100mL/min, the heating rate is 10 ℃/min, the pyrolysis retention time is 60min, and cooling to obtain the iron-based sludge.
(4) The sludge was added with 10% DS iron-based sludge coal, stirred for 10min at 350rpm in a stirrer, and further added with 0.16mmol/g VSS sodium persulfate, and stirred for 10min at 150 rpm. Then, feCl was added at 0.22mmol/g VSS 3 The mixture was stirred at 150rpm for 5min, and the change in sludge dewatering performance before and after the reaction was measured by sludge Specific Resistance (SRF). The results showed that the SRF decreased to 0.38X 10 12 m/kg, and the water content of the treated sludge is 78.78%.
Example 3
The difference from example 1 is that the pyrolysis temperature in step (3) is 600 ℃. In the step (4), ferric salt is polymeric ferric sulfate, and the adding amount is 0.10mmol/g VSS. The results show that the specific resistance of the sludge is from 2.13X 10 12 The m/kg is reduced to 0.11X 10 12 m/kg, and the water content of the treated sludge is 75.89%.
Example 4
The difference from example 2 is that the complexing agent in step (2) is tannic acid. Tannic acid and FeSO 4 ·7H 2 The molar ratio of O (1.5 mmol/g VSS (suspended volatile)) was 0.1. The pyrolysis temperature in step (3) was 600 ℃. The results show that the specific resistance of the sludge is from 2.11X 10 12 The m/kg is reduced to 0.17X 10 12 m/kg, the water content of the treated sludge is 77.13 percent.
Example 5
The difference from example 2 is that the complexing agent in step (2) is EDTA. EDTA and FeSO 4 ·7H 2 The molar ratio of O (1.5 mmol/g VSS (volatile suspended solids)) was 0.1. The results show that the specific resistance of the sludge is from 1.52 multiplied by 10 12 The m/kg is reduced to 0.05X 10 12 m/kg, and the water content of the treated sludge is 77.35 percent.
Example 6
The difference from example 1 is that the pyrolysis temperature in step (3) is 400 ℃. The results show that the specific resistance of the sludge is from 2.13X 10 12 The m/kg is reduced to 0.24X 10 12 m/kg, and the water content of the treated sludge is 78.01 percent.
Comparative example 1
The only difference from example 1 is that oxalic acid was not added in step (2). The results show that the total iron content in the mud cake decreases from 18.11g/kgDS to 17.06g/kgDS compared to the addition of oxalic acid; in the step (4), the specific resistance of the sludge is 2.13 multiplied by 10 12 The m/kg is reduced to 0.30X 10 12 m/kg, which is slightly increased compared with the method of adding oxalic acid, and the water content of the treated sludge is 78.25 percent.
Comparative example 2
The same as example 1, except that step (4) was directly performed, and activated carbon was used instead of iron-based sludge soil, purchased from Shanghai J&K Chemicals, inc. The results showed that the SRF decreased to 0.20X 10 12 m/kg, and the water content of the treated sludge is 78.24 percent. The good feasibility of the iron-based sludge carbon as a persulfate catalyst is shown.
Comparative example 3
The same as example 1, except that the step (4) was directly performed without adding iron-based peat. The results showed that the SRF decreased to 0.53X 10 12 m/kg, the water content of the treated sludge is 83.33 percent.
The above-described embodiments are only intended to illustrate the preferred embodiments of the present invention, and not to limit the scope of the present invention, and various modifications and improvements made to the technical solution of the present invention by those skilled in the art without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.

Claims (10)

1. The preparation method of the iron-based sludge carbon is characterized by comprising the following steps:
(1) Adding a complexing chelating agent and ferrite into the residual sludge, then adding persulfate, and performing suction filtration to obtain a sludge cake containing iron;
(2) And drying, crushing, sieving and pyrolyzing the iron-containing sludge cake to obtain the iron-based sludge coal.
2. The method of claim 1, wherein the complexing and chelating agent of step (1) comprises one or more of tartaric acid, citric acid, oxalic acid, tannic acid, and disodium ethylenediaminetetraacetate.
3. The preparation method according to claim 1, characterized in that the ferrous salt dosage in the step (1) is 1-3 mmol/g and the persulfate dosage is 1-2 mmol/g based on volatile suspended matters in the excess sludge.
4. The method according to claim 1, wherein the molar ratio of the complexing/chelating agent to the ferrous salt in step (1) is 0.01 to 0.1.
5. The method according to claim 1, wherein the pyrolysis in step (2) is performed under a nitrogen or inert gas atmosphere.
6. The method according to claim 1, wherein the pyrolysis temperature in the step (2) is 400-800 ℃, and the pyrolysis retention time is 40-80 min.
7. An iron-based sludge coal prepared by the method according to any one of claims 1 to 6.
8. Use of the iron-based sludge peat of claim 7 as a Fenton-flocculant-like sludge composite conditioner in sludge dewatering.
9. The application of claim 8, wherein the specific application method is as follows:
compounding the iron-based peat and persulfate, adding the mixture into sludge, adding ferric salt for coagulation assistance, stirring, standing and carrying out suction filtration.
10. The use of claim 9, wherein the ferric salt adjuvant comprises ferric chloride, ferrous sulfate, polymeric ferric chloride, or polymeric ferric sulfate.
CN202210766446.XA 2022-06-30 2022-06-30 Iron-based sludge coal, preparation method and application thereof Pending CN115155586A (en)

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