CN111675466A - Combined process for sludge treatment - Google Patents
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- CN111675466A CN111675466A CN202010406851.1A CN202010406851A CN111675466A CN 111675466 A CN111675466 A CN 111675466A CN 202010406851 A CN202010406851 A CN 202010406851A CN 111675466 A CN111675466 A CN 111675466A
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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
- C02F11/06—Treatment of sludge; Devices therefor by oxidation
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/121—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
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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
- C02F11/143—Treatment of sludge; Devices therefor by de-watering, drying or thickening with addition of chemical agents using inorganic substances
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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
- C02F11/143—Treatment of sludge; Devices therefor by de-watering, drying or thickening with addition of chemical agents using inorganic substances
- C02F11/145—Treatment of sludge; Devices therefor by de-watering, drying or thickening with addition of chemical agents using inorganic substances using calcium compounds
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
- C10L5/00—Solid fuels
- C10L5/40—Solid fuels essentially based on materials of non-mineral origin
- C10L5/46—Solid fuels essentially based on materials of non-mineral origin on sewage, house, or town refuse
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- 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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E50/00—Technologies for the production of fuel of non-fossil origin
- Y02E50/10—Biofuels, e.g. bio-diesel
-
- 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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E50/00—Technologies for the production of fuel of non-fossil origin
- Y02E50/30—Fuel from waste, e.g. synthetic alcohol or diesel
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Organic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Treatment Of Sludge (AREA)
Abstract
The invention discloses a combined process for sludge treatment, and relates to the field of sludge treatment; the method comprises the following steps of 1) sludge conditioning: sequentially adding sulfuric acid, ferrous ions, a hydrogen peroxide solution and metal oxides into sludge to be treated, stirring and carrying out advanced oxidation reaction; 2) and (3) dehydration treatment: conveying the sludge treated in the step 1) to a dehydration device for dehydration treatment; 3) crushing and screening: feeding the sludge treated in the step 2) into a crusher, crushing, adding a biomass raw material, fully mixing, and feeding the crushed sludge into a screen mesh for screening; 4) and (3) granulation: and (3) feeding the sludge treated in the step 3) into a granulator for granulation. The sludge is conditioned by using an advanced oxidation method, so that the dry basis weight gain of the sludge is effectively reduced, no chloride ion is added in the treatment process, and the treatment difficulty and cost of the filtrate are reduced; the dewatered sludge is mixed into a biomass raw material for granulation, and can be used as a raw material for incineration of a biomass power plant.
Description
Technical Field
The invention belongs to the field of sludge treatment, and particularly relates to a combined process for sludge treatment.
Background
With the development of economy, the living standard of people is improved, and the requirement on water quality is also improved. However, the sewage treatment standard is improved, the sludge yield is correspondingly increased, at present, the sludge with the water content of 80 percent can reach more than 5000 ten thousand tons every year, and the sludge problem is more serious.
In order to improve the filtering and dewatering performance of the sludge, facilitate later transportation and reduce the disposal cost, the commonly used conditioning method of the sludge conditioning which is a key treatment step is to add an organic flocculant (cationic polyacrylamide) or an inorganic flocculant (ferric chloride and quicklime), however, the water content of the sludge conditioned by the organic flocculant is only reduced to 75-85% after mechanical dewatering, and the disposal cost is increased. The sludge conditioned by the inorganic flocculant (ferric chloride and quicklime) can be quickly dewatered, however, the dry basis of the sludge is increased in weight, the chlorine-containing filtrate is increased in treatment difficulty and cost, and the filter cake contains chlorine element, so that the incineration treatment is not facilitated. .
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide a combined process for sludge treatment, which effectively improves the sludge filter-pressing performance, effectively solves the problems of low heat value of biomass fuel and corrosion to incineration equipment during incineration, and ensures that the produced sludge particles have the characteristics of high heat value and low chlorine content.
The purpose of the invention is realized by adopting the following technical scheme:
provides a combined process for sludge treatment, which comprises the following steps:
1) sludge conditioning: sequentially adding sulfuric acid, ferrous ions, a hydrogen peroxide solution and metal oxides into sludge to be treated, stirring and carrying out advanced oxidation reaction;
2) and (3) dehydration treatment: conveying the sludge treated in the step 1) to a dehydration device for dehydration treatment;
3) crushing and screening: feeding the sludge treated in the step 2) into a crusher, crushing and adding organisms
Fully mixing the raw materials, and feeding the crushed sludge into a screen mesh for screening;
4) and (3) granulation: and (3) feeding the sludge treated in the step 3) into a granulator for granulation.
Further, the metal oxide is selected from one or more of calcium oxide, magnesium oxide, iron oxide, zinc oxide and aluminum oxide.
Further, in step 1), the ferrous ion is selected from ferrous sulfate heptahydrate.
Further, in the step 1), firstly, sulfuric acid is used for adjusting the pH value of the sludge to be 2-5, then ferrous sulfate heptahydrate and hydrogen peroxide are sequentially added, stirring and advanced oxidation reaction are carried out for 30-50 min, then calcium oxide is added, and stirring is carried out for 5-10 min.
Further, in the step 1), the adding amount of the ferrous ions is 35-70 g/kg of sludge dry basis, the using amount of the hydrogen peroxide is 30-50 g/kg of sludge dry basis, and the using amount of the calcium oxide is 60-100 g/kg of sludge dry basis.
Further, in the step 2), the dewatering device is a diaphragm plate-and-frame filter press to perform filter-pressing dewatering treatment on the sludge.
Further, in the step 2), the mud feeding pressure of the diaphragm plate-and-frame filter press is 1.2-1.6 MPa, so that the filtrate continuously flows out of the filter cloth; and after the sludge feeding is finished, adjusting the pressure to be 2.5MPa, and performing secondary filter pressing on the sludge.
Further, in the step 3), the biomass raw material is selected from one or more of wood chips, peanut shells, straws, rice hulls, corn stalks and tree tails.
Further, in the step 3), wood chip particles with the particle size of 2-3 mm are selected as the biomass raw material, and the mass ratio of the sludge to the wood chip particles is 7: 1-5: 1.
Further, in the step 3), after the crusher crushes the sludge, the particle size of the sludge is not more than 3cm, the screen screens the sludge with the particle size of more than 3cm, the sludge with the particle size of more than 3cm is returned to the crusher to be crushed again, and the sludge with the particle size of not more than 3cm is sent to the granulator to be granulated.
Further, in step 4), the pelletizer is selected from a flat die pelletizer or a ring die pelletizer.
Compared with the prior art, the invention has the beneficial effects that:
compared with the traditional oxidation treatment of ferric chloride reagent, the invention adopts the chlorine-free reagent to carry out advanced oxidation treatment on the sludge
After conditioning, reducing sludge Extracellular Polymeric Substance (EPS) by about 35%; the sludge bound water is reduced by about 20 percent, the sludge particle size is reduced, and the average particle size is reduced by about 18 percent. The Zeta potential tends to be neutral, and is increased from-15 mV to-5 mV before conditioning, so that the scattered particles are convenient to re-flocculate. The filter pressing performance is further improved, and experiments show that the specific resistance of the sludge is effectively reduced by about 40-50%, the filter pressing performance of the sludge is improved, the dry basis weight gain of the sludge is effectively reduced, the dehydration performance is improved, the moisture content of produced sludge particles is reduced, and therefore the combustion efficiency is improved. Because the chlorine-free reagent is used, after the biomass raw material is added, the hydrolysate of ferric salt and calcium sulfate and the like form a rigid skeleton on the surface of particles, the mold-stripping forming rate of the biomass fuel is effectively improved, and the problem of corrosion of chlorine evolution effect to incineration equipment in the combustion process can be reduced by 91.5%; the forming rate of sludge particles is improved, and the prepared sludge particles have uniform size and large surface area and can be used as raw materials for incineration of biomass power plants.
Drawings
FIG. 1 is a flow diagram of a combined sludge treatment process of the present invention;
FIG. 2 is a graph showing the pressure filtration of example 1 of the combined sludge treatment process of the present invention;
FIG. 3 is a graph showing the pressure filtration of example 2 of the combined sludge treatment process of the present invention;
FIG. 4 is a graph of a pressure filtration curve of a comparative example of a combined process for sludge treatment according to the present invention;
wherein, 1, water yield curve; 2. pressure curve.
Detailed Description
The present invention will be further described with reference to the accompanying drawings and the detailed description, and it should be noted that any combination of the embodiments or technical features described below can be used to form a new embodiment without conflict.
The invention provides a combined process for sludge treatment, which comprises the following steps:
1) sludge conditioning: sequentially adding sulfuric acid, ferrous ions and hydrogen peroxide solution into sludge with the water content of 99 percent
And calcium oxide, stirring and carrying out advanced oxidation reaction;
in this step, the ferrous ion is selected from ferrous sulfate heptahydrate; firstly, regulating the pH value of sludge by using sulfuric acid to be 2-5, then sequentially adding ferrous sulfate heptahydrate and hydrogen peroxide, stirring and carrying out advanced oxidation reaction for 30-50 min, then adding calcium oxide, and stirring for 5-10 min; the sulfuric acid, the ferrous sulfate heptahydrate, the hydrogen peroxide solution and the calcium oxide are all of industrial grade purity; the ferrous ion adding amount is 35-70 g/kg of sludge dry basis, the hydrogen peroxide amount is 30-50 g/kg of sludge dry basis, and the calcium oxide amount is 60-100 g/kg of sludge dry basis. The advanced oxidation reaction adopts a chlorine-free reagent to effectively reduce the dry-based weight gain of the sludge and improve the filter pressing performance, and the added calcium oxide can effectively inhibit the chlorine evolution effect of the biomass in the combustion process and reduce the corrosion to instruments and equipment.
2) Plate and frame filter pressing: pressing the sludge treated in the step 1) into a dewatering device by using a plunger pump, wherein the dewatering device
The water device is a diaphragm plate-and-frame filter press for carrying out filter pressing dehydration treatment on the sludge;
in the step, the mud feeding pressure is 1.2-1.6 MPa, so that the filtrate continuously flows out of the filter cloth; and after the sludge feeding is finished, adjusting the pressure to be 2.5MPa, and performing secondary filter pressing on the sludge.
3) Crushing and screening: feeding the sludge treated in the step 2) into a crusher, crushing and adding organisms
Fully mixing the raw materials, and feeding the crushed sludge into a screen mesh for screening;
in the step, wood chip particles with the particle size of 2-3 mm are selected as the biomass raw material, and the mass ratio of sludge to the wood chip particles is 7: 1-5: 1; after the crusher crushes the sludge, the particle size of the sludge is not more than 3cm, the screen screens the sludge with the particle size of more than 3cm, the sludge with the particle size of more than 3cm is returned to the crusher to be crushed again, and the sludge with the particle size of not more than 3cm is sent to a granulator to be granulated. After the wood chips are added, the hydrolysate of ferric salt and calcium sulfate and the like form a rigid framework on the particle surface, the demolding molding rate of the biomass fuel is effectively improved and can reach 91.5 percent, and the prepared sludge particles are uniform in size and large in surface area.
4) And (3) granulation: and (3) feeding the sludge treated in the step 3) into a medium granulator for granulation, wherein the granulator is a flat-die granulator, and the obtained sludge granules can be used as raw materials for power plant incineration.
In the embodiment, the sludge is conditioned by using an advanced oxidation method, the sludge dry basis weight gain only reaches 8%, no chloride ion is added in the treatment process, and the treatment difficulty and cost of the filtrate are reduced; the sludge is dewatered by utilizing a diaphragm plate-and-frame filter press, the dewatered sludge is mixed into a biomass raw material for granulation, the water content of the sludge is about 40 percent after granulation, the heat value is improved, and the sludge can be used as a raw material for incineration of a biomass power plant. The calcium oxide is added, so that the chlorine evolution effect of the biomass in the combustion process can be effectively inhibited, and the corrosion to instrument and equipment is reduced.
Example 1:
the embodiment provides a combined process for sludge treatment, which comprises the following steps:
1) 100kg (about 100L) of sludge with the water content of about 98.5 percent is taken and poured into a conditioning tank;
2) the sludge pH was adjusted to 3 using 50% sulfuric acid, Fe was added2+Adding the sludge into the sludge, wherein the adding amount is 35g/(kg of dry sludge), mechanically stirring for 5min, and then adding H2O2Mechanically stirring for 30min with the addition of 30g/(kg dry sludge), adding CaO with the addition of 100g/(kg dry sludge), and stirring for 5 min; the average grain diameter of the treated sludge is 48.06 mu m, and the weight of the sludge dry matrix is increased by 10.6 percent.
3) Starting a plunger pump, conveying the sludge in the conditioning tank to a membrane plate-and-frame filter press, and keeping the sludge inlet pressure at 1.6MPa for 1 h; after the sludge is completely conveyed to the filter press, a press pump is started to carry out filter pressing, the pressure is set to be 2.5MPa, and a filter pressing curve is shown in figure 2;
4) after filter pressing is finished, collecting sludge cakes, measuring the water content, manually crushing, and adding wood chips in the crushing process, wherein the mass ratio of sludge to wood chips is 5: 1;
5) after crushing and mixing, the materials are put into a flat die granulator for granulation, and the water content of the granules is measured to be 33.4 percent and the high calorific value is measured to be 1824 cal.
Example 2:
the embodiment provides a combined process for sludge treatment, which comprises the following steps:
1) 100kg (about 100L) of sludge with the water content of about 98.2 percent is taken and poured into a conditioning tank;
2) the sludge pH was adjusted to 3 using 50% sulfuric acid, Fe was added2+Adding 70g/(kg dry sludge), mechanically stirring for 5min, and adding H2O2Mechanically stirring for 30min with the addition of 30g/(kg dry sludge), adding CaO with the addition of 60g/(kg dry sludge), and stirring for 5 min; the average grain diameter of the treated sludge is 46.05 mu m, and the weight of the sludge dry matrix is increased by 8.4 percent.
3) Starting a plunger pump, conveying the sludge in the conditioning tank to a membrane plate-and-frame filter press, and keeping the sludge inlet pressure at 1.6MPa for 1 h; after the sludge is completely conveyed to the filter press, a press pump is started to carry out filter pressing, the pressure is set to be 2.5MPa, and a filter pressing curve is shown in a graph 3;
4) after filter pressing is finished, collecting sludge cakes, measuring the water content, manually crushing, and adding wood chips in the crushing process, wherein the mass ratio of sludge to wood chips is 3: 1;
5) after crushing and mixing, the materials are put into a flat die granulator for granulation, and the moisture content of the granules is measured to be 40.3 percent and the high calorific value is measured to be 1788 cal.
Comparative example:
the comparative example provides a common process for sludge treatment comprising the steps of:
1) 100kg (about 100L) of sludge with the water content of about 98.7 percent is taken and poured into a conditioning tank;
2) adding ferric trichloride with the addition amount of 35g/(kg dry sludge), mechanically stirring for 5min, adding CaO with the addition amount of 100g/(kg dry sludge), and stirring for 5 min; the average grain diameter of the treated sludge is 58.6 mu m, and the weight of the sludge dry matrix is increased by 24.5 percent.
3) Starting a plunger pump, conveying the sludge in the conditioning tank to a membrane plate-and-frame filter press, and keeping the sludge inlet pressure at 1.6MPa for 1 h; after the sludge is completely conveyed to the filter press, a press pump is started to carry out filter pressing, the pressure is set to be 2.5MPa, and a filter pressing curve is shown in a graph 4;
4) after filter pressing is finished, collecting sludge cakes, measuring the water content, manually crushing, and adding wood chips in the crushing process, wherein the mass ratio of sludge to wood chips is 5: 1;
5) after crushing and mixing, the materials are put into a flat die granulator for granulation, and the water content of the granules is measured to be 48.7 percent and the high calorific value is measured to be 1121 cal.
Table 1 example data:
referring to table 1 and fig. 2 to 4, the sludge is conditioned by using an advanced oxidation method, the initial increase of the water yield in a filter-pressing curve is faster than that of a comparative example, and more water yield can be achieved under less pressure, so that the filter-pressing performance is further improved, and experiments show that the specific resistance of the sludge is effectively reduced by about 40-50%, the filter-pressing performance of the sludge is improved, and Extracellular Polymers (EPS) of the sludge are reduced by about 35%; the sludge bound water is reduced by about 20 percent, the sludge particle size is reduced, and the average particle size is reduced by about 18 percent. The Zeta potential tends to be neutral, and is increased from-15 mV to-5 mV before conditioning, so that the scattered particles are convenient to re-flocculate. The sludge dry basis weight gain is only 8 percent, no chloride ion is added in the treatment process, and the treatment difficulty and cost of the filtrate are reduced; the sludge is dewatered by utilizing a diaphragm plate-and-frame filter press, the dewatered sludge is mixed into a biomass raw material for granulation, the water content of the sludge is about 40 percent after granulation, the heat value is improved, and the sludge can be used as a raw material for incineration of a biomass power plant.
The above embodiments are only preferred embodiments of the present invention, and the protection scope of the present invention is not limited thereby, and any insubstantial changes and substitutions made by those skilled in the art based on the present invention are within the protection scope of the present invention.
Claims (11)
1. A combined process for sludge treatment is characterized by comprising the following steps:
1) sludge conditioning: sequentially adding sulfuric acid, ferrous ions, a hydrogen peroxide solution and metal oxides into sludge to be treated, stirring and carrying out advanced oxidation reaction;
2) and (3) dehydration treatment: conveying the sludge treated in the step 1) into a dehydration device for dehydration treatment;
3) crushing and screening: feeding the sludge treated in the step 2) into a crusher, crushing and adding organisms
Fully mixing the raw materials, and feeding the crushed sludge into a screen mesh for screening;
4) and (3) granulation: and (3) feeding the sludge treated in the step 3) into a granulator for granulation.
2. The combined process of sludge treatment as claimed in claim 1, wherein: the metal oxide is selected from one or more of calcium oxide, magnesium oxide, iron oxide, zinc oxide and aluminum oxide.
3. The combined process of sludge treatment as claimed in claim 1, wherein: in the step 1), the ferrous ions are selected from ferrous sulfate heptahydrate.
4. A combined sludge treatment process according to any one of claims 1 to 3, characterized in that: in the step 1), firstly, sulfuric acid is used for adjusting the pH value of sludge to be 2-5, then ferrous sulfate heptahydrate and hydrogen peroxide are sequentially added, stirring and advanced oxidation reaction are carried out for 30-50 min, then calcium oxide is added, and stirring is carried out for 5-10 min.
5. The combined process of sludge treatment as claimed in claim 4, wherein: in the step 1), the addition amount of the ferrous ions is 35-70 g/kg of sludge dry basis, the dosage of the hydrogen peroxide is 30-50 g/kg of sludge dry basis, and the dosage of the calcium oxide is 60-100 g/kg of sludge dry basis.
6. The combined process of sludge treatment as claimed in claim 1, wherein: in the step 2), the dewatering device is a diaphragm plate-and-frame filter press to perform filter-pressing dewatering treatment on the sludge.
7. The combined process of sludge treatment as claimed in claim 6, wherein: in the step 2), the mud feeding pressure of the diaphragm plate-and-frame filter press is 1.2-1.6 MPa, so that filtrate continuously flows out of the filter cloth; and after the sludge feeding is finished, adjusting the pressure to be 2.5MPa, and performing secondary filter pressing on the sludge.
8. The combined process of sludge treatment as claimed in claim 1, wherein: in the step 3), the biomass raw material is selected from one or more of wood chips, peanut shells, straws, rice hulls, corn stalks and tree tails.
9. The combined process of sludge treatment as claimed in claim 8, wherein: in the step 3), wood chip particles with the particle size of 2-3 mm are selected as the biomass raw material, and the mass ratio of sludge to the wood chip particles is 7: 1-5: 1.
10. The combined process of sludge treatment as claimed in claim 1, wherein: in the step 3), after the crusher crushes the sludge, the particle size of the sludge is not more than 3cm, the screen screens the sludge with the particle size of more than 3cm, the sludge with the particle size of more than 3cm is returned to the crusher to be crushed again, and the sludge with the particle size of not more than 3cm is sent to a granulator to be granulated.
11. The combined process of sludge treatment as claimed in claim 1, wherein: in the step 4), the granulator is selected from a flat-die granulator or a ring-die granulator.
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| CN112979121A (en) * | 2021-01-19 | 2021-06-18 | 广东卓信环境科技股份有限公司 | Organic sludge treatment method |
| CN115321771A (en) * | 2022-08-25 | 2022-11-11 | 中国科学院广州能源研究所 | Method for preparing granular fuel through sludge gradient deep drying |
| CN115340283A (en) * | 2022-08-22 | 2022-11-15 | 中国科学院广州能源研究所 | Municipal sludge energy utilization method |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112979121A (en) * | 2021-01-19 | 2021-06-18 | 广东卓信环境科技股份有限公司 | Organic sludge treatment method |
| CN115340283A (en) * | 2022-08-22 | 2022-11-15 | 中国科学院广州能源研究所 | Municipal sludge energy utilization method |
| CN115321771A (en) * | 2022-08-25 | 2022-11-11 | 中国科学院广州能源研究所 | Method for preparing granular fuel through sludge gradient deep drying |
| CN115321771B (en) * | 2022-08-25 | 2023-11-14 | 中国科学院广州能源研究所 | Method for preparing granular fuel by gradient deep drying of sludge |
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