CN111847820A - Sludge dewatering method based on hydrothermal method - Google Patents
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- 239000010802 sludge Substances 0.000 title claims abstract description 181
- 238000001027 hydrothermal synthesis Methods 0.000 title claims abstract description 40
- 238000000034 method Methods 0.000 title claims abstract description 33
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 30
- 239000007800 oxidant agent Substances 0.000 claims abstract description 26
- 230000001590 oxidative effect Effects 0.000 claims abstract description 24
- 239000002002 slurry Substances 0.000 claims abstract description 17
- 239000002131 composite material Substances 0.000 claims abstract description 16
- 239000012190 activator Substances 0.000 claims abstract description 14
- 238000003756 stirring Methods 0.000 claims abstract description 8
- 238000002156 mixing Methods 0.000 claims abstract description 6
- 238000007885 magnetic separation Methods 0.000 claims abstract description 5
- 229910016516 CuFe2O4 Inorganic materials 0.000 claims description 20
- 239000000203 mixture Substances 0.000 claims description 8
- CHQMHPLRPQMAMX-UHFFFAOYSA-L sodium persulfate Chemical compound [Na+].[Na+].[O-]S(=O)(=O)OOS([O-])(=O)=O CHQMHPLRPQMAMX-UHFFFAOYSA-L 0.000 claims description 8
- 229910004882 Na2S2O8 Inorganic materials 0.000 claims description 7
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 claims description 6
- DXKGMXNZSJMWAF-UHFFFAOYSA-N copper;oxido(oxo)iron Chemical compound [Cu+2].[O-][Fe]=O.[O-][Fe]=O DXKGMXNZSJMWAF-UHFFFAOYSA-N 0.000 claims description 5
- JRKICGRDRMAZLK-UHFFFAOYSA-L persulfate group Chemical group S(=O)(=O)([O-])OOS(=O)(=O)[O-] JRKICGRDRMAZLK-UHFFFAOYSA-L 0.000 claims description 5
- 238000010438 heat treatment Methods 0.000 claims description 3
- 239000008367 deionised water Substances 0.000 claims description 2
- 229910021641 deionized water Inorganic materials 0.000 claims description 2
- 230000014759 maintenance of location Effects 0.000 claims description 2
- 238000002360 preparation method Methods 0.000 claims description 2
- 238000007254 oxidation reaction Methods 0.000 abstract description 33
- 230000003647 oxidation Effects 0.000 abstract description 32
- 238000005516 engineering process Methods 0.000 abstract description 22
- 230000002195 synergetic effect Effects 0.000 abstract description 10
- IYRDVAUFQZOLSB-UHFFFAOYSA-N copper iron Chemical compound [Fe].[Cu] IYRDVAUFQZOLSB-UHFFFAOYSA-N 0.000 abstract 1
- 238000002203 pretreatment Methods 0.000 abstract 1
- 230000018044 dehydration Effects 0.000 description 20
- 238000006297 dehydration reaction Methods 0.000 description 20
- 238000010335 hydrothermal treatment Methods 0.000 description 11
- 239000011734 sodium Substances 0.000 description 11
- 238000001914 filtration Methods 0.000 description 8
- 230000000694 effects Effects 0.000 description 6
- 230000002708 enhancing effect Effects 0.000 description 6
- 230000001965 increasing effect Effects 0.000 description 6
- 239000010865 sewage Substances 0.000 description 6
- 238000005265 energy consumption Methods 0.000 description 4
- 238000003825 pressing Methods 0.000 description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- 239000000654 additive Substances 0.000 description 3
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- 238000006243 chemical reaction Methods 0.000 description 3
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- SZVJSHCCFOBDDC-UHFFFAOYSA-N ferrosoferric oxide Chemical compound O=[Fe]O[Fe]O[Fe]=O SZVJSHCCFOBDDC-UHFFFAOYSA-N 0.000 description 3
- 239000000706 filtrate Substances 0.000 description 3
- 230000007935 neutral effect Effects 0.000 description 3
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- 238000001179 sorption measurement Methods 0.000 description 3
- LCPVQAHEFVXVKT-UHFFFAOYSA-N 2-(2,4-difluorophenoxy)pyridin-3-amine Chemical group NC1=CC=CN=C1OC1=CC=C(F)C=C1F LCPVQAHEFVXVKT-UHFFFAOYSA-N 0.000 description 2
- 230000004913 activation Effects 0.000 description 2
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- 230000002378 acidificating effect Effects 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 238000006065 biodegradation reaction Methods 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
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- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 238000009264 composting Methods 0.000 description 1
- BERDEBHAJNAUOM-UHFFFAOYSA-N copper(I) oxide Inorganic materials [Cu]O[Cu] BERDEBHAJNAUOM-UHFFFAOYSA-N 0.000 description 1
- KRFJLUBVMFXRPN-UHFFFAOYSA-N cuprous oxide Chemical compound [O-2].[Cu+].[Cu+] KRFJLUBVMFXRPN-UHFFFAOYSA-N 0.000 description 1
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- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
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- 239000002245 particle Substances 0.000 description 1
- 239000003415 peat Substances 0.000 description 1
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Classifications
-
- 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
-
- 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
-
- 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
- C02F11/13—Treatment of sludge; Devices therefor by de-watering, drying or thickening by heating
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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- Treatment Of Sludge (AREA)
Abstract
The invention relates to a sludge dewatering method based on a hydrothermal method, which comprises the following steps: adding an oxidant and an activator into the sludge, and stirring and mixing uniformly; carrying out hydrothermal reaction on the sludge which is uniformly stirred and mixed; and mechanically dehydrating the sludge slurry obtained after the hydrothermal reaction. Under the synergistic effect of the hydrothermal method and the advanced oxidation technology, surface adsorbed water in the sludge is converted into interstitial water and free water, the sludge dewatering performance is improved, the water content of the obtained mud cake is reduced to about 50%, and the iron-copper magnetic composite material can be recovered through magnetic separation, so that the later-stage resource utilization of the sludge is not influenced. The pretreatment method provided by the invention is simple, mild in treatment conditions, safe and environment-friendly, and can provide a brand new idea for a high-efficiency sludge dewatering means.
Description
Technical Field
The invention belongs to the technical field of sludge treatment, and particularly relates to a method for enhancing sludge dewatering performance by a hydrothermal method in cooperation with an advanced oxidation technology.
Background
With the rapid development of our society, people's living standard is gradually improved, and the environmental problems therewith are gradually increased. Among them, the problems of sewage and sludge become more serious, the discharge and treatment amount of sewage gradually increases, and the sludge is rapidly increased along with the sewage yield. By the end of 2018 years, 4332 seats of a sewage treatment plant are built up in cities and towns in China and the sewage treatment capacity reaches 1.95 hundred million m 3And d, the annual sludge (water content is 80%) production amount reaches more than 4000 ten thousand tons, and the national sludge production amount reaches 6000 ten thousand tons in 2020. Among the existing sludge treatment methods, the sludge treatment method in China mainly comprises modes of landfill, composting, natural drying, incineration and the like, and has higher requirements on the water content. When the sludge of the urban sewage treatment plant is used for landfill or mixed landfill, the water content of the sludge needs to reach at least below 60 percent, and when the sludge is used for covering soil in refuse landfill, the water content needs to be reduced to 45 percent; when the sludge is used as a soil conditioner, a fertilizer or a fuel for a cement kiln, a power plant or an incinerator, the water content of the sludge is reduced to at least below 30%, and when the sludge is used as a building material for brickmaking and the like, the water content of the sludge is required to be reduced to below 40%. Due to the limitation of the characteristics of the sludge, the conventional filter pressing dehydration mode of adding CaO and then plate frames still contains about 60 percent of water after mechanical dehydration, and the heat drying energy consumption is too high. Therefore, dewatering is currently the key to restrict further progress in sludge disposal processes.
At present, the mature sludge deep dehydration technology comprises physical and chemical methods such as acid-base treatment, advanced oxidation technology, heat treatment and the like, and biodegradation methods such as bioleaching and enzyme treatment and the like. The dehydration performance of the sludge dehydrated by the hydrothermal method is good, and in the hydrothermal process, the moisture in the sludge is removed in a liquid form, so that the energy consumed in the form of the latent heat of vaporization of water in the treatment process is reduced. Researches show that the optimal reaction hydrothermal temperature can be effectively reduced and the sludge dewatering efficiency can be improved after the hydrothermal method and other methods are combined for treatment. The acid can obviously improve the sludge dewatering performance, but has the problem of corrosion to equipment; the dehydration effect of the alkali-treated sludge is poor, and the dehydration performance is deteriorated; compared with acid-base treatment, the advanced oxidation technology has obvious improvement on dehydration effect, but conventional oxidation reactions such as Fenton oxidation, Fenton-like oxidation and the like are mostly carried out under an acidic condition, so that metal is easily corroded, and the requirement on equipment is high.
Disclosure of Invention
The invention aims to solve the technical problem of providing a sludge dewatering method based on a hydrothermal method, which reduces the energy consumption of the hydrothermal method and improves the sludge dewatering performance aiming at the defects of the prior art.
In order to solve the technical problems, the invention adopts the technical scheme that:
a sludge dewatering method based on a hydrothermal method is characterized by comprising the following steps:
adding an oxidant and an activator into the sludge, and stirring and mixing uniformly;
carrying out hydrothermal reaction on the sludge which is uniformly stirred and mixed;
and mechanically dehydrating the sludge slurry obtained after the hydrothermal reaction.
The oxidant added into the sludge is persulfate, and the addition mass of the persulfate is 0.06-0.12 mmol/g-VSS relative to the amount of the sludge.
The activator added into the sludge is magnetic composite CuFe2O4，Na2S2O8/CuFe2O4The mass ratio is 1: 1-10: 1. magnetic composite material except for CuFe2In addition to O4, a Cu2O/Fe3O4/RGO (graphene) magnetic composite photocatalyst, a TiO2-Fe3O4/SAC (peat activated carbon) magnetic photocatalyst, or the like can be used.
The hydrothermal temperature in the hydrothermal reaction is 150-180 ℃, and the reaction time is 30-90 min.
Mechanical dewatering of the sludge slurry obtained after hydrothermal reactionFirstly, recovering the magnetic composite CuFe in the sludge slurry obtained after the hydrothermal reaction 2O4。
Magnetic separation recovery of magnetic composite CuFe2O4。
Mechanical dewatering is carried out by adopting a filter press.
The water content of the sludge is 80-98%.
Magnetic composite material CuFe2O4The preparation steps are as follows:
(1) 0.01mol Fe (NO) was weighed3)3·9H2O with 0.005mol Cu (NO)3)2·6H2Placing the O into a beaker;
(2) adding 30mL of deionized water, placing the mixture into a constant temperature oscillator, and oscillating the mixture at the rotating speed of 150r/min for 2 hours at the temperature of 60 ℃;
(3) adding 0.015mol of citric acid, mixing uniformly, and continuing to oscillate for 2 hours;
(4) putting into a water bath kettle at 90 ℃, and heating at constant temperature for 5h until the mixture becomes dark brown sol;
(5) finally, the mixture is put into a tube furnace and heated to 400 ℃ under inert atmosphere, and the retention time is 2 hours.
The method selects a neutral advanced oxidation reagent, degrades sludge extracellular polymers by a hydrothermal method and an advanced oxidation technology, releases surface adsorption water in the sludge extracellular polymers, improves the sludge dehydratability and reduces the sludge cake water content. In addition, under the synergistic effect of the two methods, the activity of free radicals of the advanced oxidation technology can be improved, the temperature of the hydrothermal method can be reduced, the problem of low efficiency of the single advanced oxidation technology is solved, the energy consumption of the hydrothermal method is reduced, and the sludge dewatering performance is improved.
The dehydration method comprises the following specific operation steps:
A. Adding an oxidant and an activator into the sludge, stirring and mixing uniformly, wherein the oxidant is sodium persulfate, the addition amount of the oxidant is 0.06-0.12 mmol/g-VSS relative to the sludge, and the catalyst is a magnetic composite material CuFe2O4， Na2S2O8/CuFe2O4The mass ratio is 1: 1-10: 1;
B. b, performing hydrothermal reaction on the sludge to be treated obtained in the step A, wherein the hydrothermal temperature is 150-180 ℃, and the reaction time is 60 min;
C. taking sludge obtained after the hydrothermal reaction in the step B, and recovering CuFe by using a magnetic separation technology2O4A magnetic composite material;
D. and D, introducing the sludge slurry obtained after the hydrothermal reaction in the step C into a filter press for mechanical dehydration.
Wherein step C is an optional step.
The working principle of the invention is as follows:
the persulfate advanced oxidation technology has wide pH application range, and can perform activation reaction under neutral condition to generate sulfate radical (SO)4 —·), magnetic composite material CuFe2O4Has higher catalytic activation performance than other metal oxides and can greatly increase SO in solution4 —The concentration of (a) and (b) improves the sludge oxidative degradation efficiency. The sludge Extracellular Polymeric Substance (EPS) is degraded to release surface adsorption water in sludge particles, and the surface adsorption water is converted into free water and interstitial water which can be mechanically removed, so that the dehydration degree of the sludge is improved. The hydrothermal reaction degrades the hydrophilic oxygen-containing functional groups such as C-O and C = O in the sludge floc, promotes the generation of a hydrophobic skeleton C-C/C-H, releases the surface adsorbed water in the sludge extracellular polymer, can obviously improve the dehydration degree of the sludge, and improves the dehydration performance of the sludge.
Compared with other methods, the method for enhancing the sludge dewatering performance by the hydrothermal method in cooperation with the advanced oxidation technology has the following advantages:
1) the invention adopts a hydrothermal method, reduces the energy consumed by the moisture in the form of latent heat of vaporization in the treatment process, saves energy and reduces cost;
2) the sodium persulfate oxidant is adopted, so that the oxidative degradation under a neutral condition can be realized, and the corrosion to equipment is small;
3) the hydrothermal method is cooperated with an advanced oxidation technology to treat the sludge, so that the optimal hydrothermal reaction temperature can be effectively reduced, and the energy consumption is reduced;
4) the hydrothermal method is cooperated with an advanced oxidation technology to further improve the sludge dewatering performance.
5) Magnetic composite material CuFe2O4The magnetic separation can be utilized for recycling, and the later-stage resource utilization of the sludge is not influenced.
Drawings
FIG. 1 is a comparison of sludge dewatering performance in four cases of raw sludge, sludge subjected to advanced oxidation treatment alone, sludge subjected to hydrothermal treatment alone, and sludge subjected to hydrothermal synergistic advanced oxidation treatment in example 1 of the present invention;
FIG. 2 shows the effect of the amount of oxidant added to the sludge and the mass ratio of activator/oxidant in the advanced oxidation treatment in example 2 of the present invention;
FIG. 3 is a graph showing the effect of hydrothermal temperature in hydrothermal reaction with advanced oxidation treatment of sludge in example 3 of the present invention.
Detailed Description
The present invention will now be described in detail with reference to specific examples, which are provided for illustration of the present invention and are not intended to limit the scope of the present invention.
In the following examples, specific sludge filtration resistance (SRF), Capillary Suction Time (CST), and water content of dewatered cake (W) were measuredc) For evaluation index, CST, SRF, WcThe lower the sludge dewatering amount is, the better the sludge dewatering effect is improved.
The invention relates to a method for enhancing sludge dewatering performance by combining a hydrothermal method with an advanced oxidation technology, which is used for carrying out hydrothermal combination on sludge by Na2S2O8/CuFe2O4Advanced oxidation pretreatment, adopting hydrothermal temperature of 110, 130, 150 and 180 ℃ and Na2S2O8The addition amount of the additive is 0.06, 0.08 and 0.12mmol/g-VSS (volatile suspended matter in the sludge) relative to the amount of the sludge, and Na2S2O8/CuFe2O4The mass ratio is 1: 1. 2: 1. 5: 1. 10: 1, four mass ratios. The working condition naming law is HT-temperature-ADD-oxidant addition amount-activator/oxidant mass ratio.
Example 1
The invention relates to a method for enhancing sludge dewatering performance by a hydrothermal method in cooperation with an advanced oxidation technology, which comprises the following specific steps:
A. taking raw sludge, and uniformly stirring;
B. taking raw sludge, adding an oxidant, an activator and Na into the sludge 2S2O8The addition amount of the additive is 0.08mmol/g-VSS and Na relative to the amount of the sludge2S2O8/CuFe2O4The mass ratio is 2: 1, uniformly stirring;
C. taking raw sludge, and carrying out hydrothermal treatment at the hydrothermal temperature of 150 ℃ for 60 min;
D. b, carrying out hydrothermal treatment on the sludge treated in the step B, wherein the hydrothermal temperature is 150 ℃, and the reaction time is 60 min;
E. respectively putting the sludge obtained in the step A, B, C, D into an oscillator, wherein the oscillation time is 2h, and the rotation speed of the oscillator is 150 r/min;
F. e, putting the sludge slurry obtained after the treatment in the step E into a CST measuring device, and respectively measuring the CST value of the sludge under four working conditions;
G. e, placing the sludge slurry obtained after the treatment in the step E into an SRF measuring device, and respectively calculating SRF values of the sludge under four working conditions;
H. e, introducing the sludge slurry obtained after the treatment in the step E into a filter press for mechanical dehydration to obtain dehydrated mud cakes and filtrate, wherein the pressure is 0.8MPa, the filter pressing time is 1min, and the sludge W under four working conditions is respectively measuredcThe value is obtained.
As can be seen from FIG. 1, the SRF of the sludge after the single advanced oxidation treatment is 1.1049X 1012s2The/kg is reduced to 0.5778 multiplied by 1012s2Per kg; after the single hydrothermal treatment at 150 ℃, the SRF of the sludge is reduced to 0.9770 multiplied by 1012s2Per kg; after the hydrothermal synergistic advanced oxidation treatment, the synergistic effect is generated, and the SRF of the sludge is further reduced to 0.5367 multiplied by 10 12s2The improvement efficiency is about 51.43 percent per kg.
As can be seen from the figure 1, the CST of the original sludge is 348s, and the CST of the sludge is 236s after the treatment of the single advanced oxidation technology, which is reduced by about 32.18%; after the single hydrothermal treatment at 150 ℃, the sludge CST is 157s, which is reduced by 54.89%; after the hydrothermal synergistic advanced oxidation treatment, the sludge CST is 144s, the synergistic effect is generated, and the sludge dewatering performance is greatly improved.
As can be seen from figure 1, the sludge is treated by a single advanced oxidation technology and a single hydrothermal treatment at 150 ℃, and the water content W of the sludge cake after the sludge is dehydratedcStill over 60%; w after hydrothermal synergistic advanced oxidation treatmentc51.57 percent, which is reduced by 25.24 percent compared with the original sludge, and the dehydration performance of the sludge is obviously improved.
In summary, there is a synergistic effect between the sludge hydrothermal treatment and the advanced oxidation technology treatment, compared to the single treatment, SRF, CST and W of the sludgecThe sludge dewatering device is further improved after the synergistic treatment, and the sludge dewatering performance is integrally improved.
Example 2
The invention relates to a method for enhancing sludge dewatering performance by a hydrothermal method in cooperation with an advanced oxidation technology, which comprises the following specific steps:
A. adding oxidant and activator, Na into sludge 2S2O8The addition amounts of the components are respectively 0.06, 0.08, 0.12mmol/g-VSS and Na relative to the amount of the sludge2S2O8/CuFe2O4The mass ratio is 1: 1. 2: 1. 5: 1. 10: 1, uniformly stirring;
B. b, placing the sludge to be treated obtained in the step A into an oscillator, wherein the oscillation time is 2h, and the rotating speed of the oscillator is 150 r/min;
C. b, putting the sludge slurry obtained after the treatment in the step B into a CST measuring device, and respectively measuring sludge CST values under the working conditions of different oxidant addition amounts and activator/oxidant mass ratios;
D. b, placing the sludge slurry obtained after the treatment in the step B into an SRF measuring device, and respectively calculating the SRF values of the sludge under the working conditions of different oxidant addition amounts and activator/oxidant mass ratios;
E. introducing the sludge slurry obtained after the treatment in the step B into a filter press for mechanical dehydration to obtain dehydrated sludge cakes and filtrate, wherein the pressure is 0.8MPa, the filter pressing time is 1min, the water content of the treated sludge is 65.31 percent, and the sludge W under the working conditions of different oxidant addition amounts and activator/oxidant mass ratios are respectively measuredcThe value is obtained.
As can be seen from fig. 2, as the amount of the oxidizing agent added increases, the filtration performance of the sludge and the dehydration rate tend to increase and then decrease. When Na is present2S2O8When the addition amount is 0.06mmol/g-VSS, the sludge CST and SRF are respectively reduced to 295s and 0.8618 multiplied by 10 12s2The dehydration rate of the raw sludge is improved by 15.23 percent and the filtration performance is improved by 22 percent compared with the raw sludge; when Na is present2S2O8When the addition amount is 0.12 mmol/g-VSS, CST and SRF are respectively improved by 17.24 percent and 20.49 percent compared with the original sludge; at 0.08mmol/g-VSS, CST and SRF were minimized, CST was reduced to 236s, and SRF was reduced to 0.5778X 1012s2Per kg; the water content of the sludge press-filtration mud cake is basically over 60 percent, and the lowest value is reached when the addition amount of the oxidant is 0.08mmol/g-VSS, which is 62.73 percent.
As can be seen from FIG. 2, with Na2S2O8/CuFe2O4The increase of the mass ratio leads the CST and SRF of the sludge to show the trend of increasing after decreasing when Na is added2S2O8/CuFe2O4The mass ratio is 2: when 1, the dehydration rate and the filtration performance of the sludge reach the best.
In conclusion, the optimal addition amount of the oxidant for treating the sludge by the advanced oxidation technology is 0.08mmol/g-VSS, and the optimal Na is2S2O8/CuFe2O4The mass ratio is 2: 1, the dehydration performance of the sludge under the working condition is improved.
Example 3
The invention relates to a method for enhancing sludge dewatering performance by a hydrothermal method in cooperation with an advanced oxidation technology, which comprises the following specific steps:
A. adding oxidant and activator, Na into sludge2S2O8The addition amount of the additive is 0.08mmol/g-VSS and Na relative to the amount of the sludge2S2O8/CuFe2O4The mass ratio is 2: 1, uniformly stirring;
B. b, performing hydrothermal treatment on the sludge obtained in the step A, wherein the hydrothermal temperature is 110 ℃, 130 ℃, 150 and 180 ℃ respectively;
C. B, placing the sludge to be treated obtained in the step A into an oscillator, wherein the oscillation time is 2h, and the rotating speed of the oscillator is 150 r/min;
D. c, putting the sludge slurry obtained after the treatment in the step C into a CST measuring device, and respectively measuring sludge CST values under different hydrothermal temperature working conditions;
E. c, placing the sludge slurry obtained after the treatment in the step C into an SRF measuring device, and respectively calculating SRF values of the sludge under different hydrothermal temperature working conditions;
F. c, introducing the sludge slurry obtained after the treatment in the step C into a filter press for mechanical dehydration to obtain dehydrated sludge cakes and filtrate, wherein the pressure is 0.8MPa, the filter pressing time is 1min, and the sludge W under different hydrothermal temperature working conditions is respectively measuredcThe value is obtained.
As can be seen from FIG. 3, the SRF of the sludge decreases with increasing hydrothermal temperature. The specific resistance of the sludge filtration is reduced to 1.02 multiplied by 10 when the temperature is 150 DEG C12s2The following/kg indicates that the sludge is easily dewatered by hydrothermal treatment. The specific resistance of sludge filtration is reduced to 0.0234 multiplied by 10 to the minimum after the temperature is 180 DEG C12s2And/kg, the sludge filtration performance is improved by 97.88 percent.
As can be seen from FIG. 3, the sludge dewatering performance at 110 ℃ is general, the sludge CST is reduced along with the increase of the hydrothermal temperature, the sludge dewatering rate is gradually improved after the temperature is increased to 130 ℃, and the sludge dewatering rate is increased by 62.64% at 180 ℃.
As can be seen from FIG. 3, the water content of the sludge dewatered cake gradually decreases with the increase of the temperature, reaches the lowest value of 50.62% at 180 ℃, and is reduced by 26.19% compared with the original sludge, but the change is not obvious when compared with the original sludge at 150 ℃, and is reduced by 0.95%.
In summary, the sludge can effectively improve the sludge dewatering performance at the hydrothermal treatment temperature of above 150 ℃, previous researches show that the optimal temperature of the sludge hydrothermal treatment is 180 ℃, and the embodiment discovers that the hydrothermal combination Na is adopted2S2O8/CuFe2O4After advanced oxidation technology, the optimal reaction temperature of the sludge is reduced to 150 ℃.
Claims (10)
1. A sludge dewatering method based on a hydrothermal method is characterized by comprising the following steps:
adding an oxidant and an activator into the sludge, and stirring and mixing uniformly;
carrying out hydrothermal reaction on the sludge which is uniformly stirred and mixed;
and mechanically dehydrating the sludge slurry obtained after the hydrothermal reaction.
2. The sludge dewatering method according to claim 1, wherein the oxidant added to the sludge is persulfate, and the addition amount of the oxidant relative to the sludge is 0.06-0.12 mmol/g-VSS.
3. The sludge dewatering method according to claim 2, wherein the activator added to the sludge is a magnetic composite material.
4. The sludge dewatering method according to claim 3, wherein the magnetic composite material is CuFe2O 4; persulfate is Na2S2O 8; the mass ratio of Na2S2O8 to CuFe2O4 is 1: 1-10: 1.
5. the sludge dewatering method according to claim 4, wherein the hydrothermal temperature in the hydrothermal reaction is 150 to 180 ℃.
6. The sludge dewatering method according to claim 4, wherein the magnetic composite material CuFe in the sludge slurry obtained after the hydrothermal reaction is recovered before mechanical dewatering of the sludge slurry obtained after the hydrothermal reaction2O4。
7. The sludge dewatering method of claim 6, wherein magnetic separation is used to recover the magnetic composite CuFe2O4。
8. The method for sludge dewatering according to any one of claims 1-7, characterized in that mechanical dewatering is performed using a filter press.
9. The method for dewatering sludge according to any one of claims 1 to 7, wherein the water content of the sludge is 80 to 98%.
10. The sludge dewatering method of claim 4, wherein the magnetic composite material is CuFe2O4The preparation steps are as follows:
(1) 0.01mol Fe (NO) was weighed3)3·9H2O with 0.005mol Cu (NO)3)2·6H2Placing the O into a beaker;
(2) adding 30mL of deionized water, placing the mixture into a constant temperature oscillator, and oscillating the mixture at the rotating speed of 150r/min for 2 hours at the temperature of 60 ℃;
(3) Adding 0.015mol of citric acid, mixing uniformly, and continuing to oscillate for 2 hours;
(4) putting into a water bath kettle at 90 ℃, and heating at constant temperature for 5h until the mixture becomes dark brown sol;
(5) finally, the mixture is put into a tube furnace and heated to 400 ℃ under inert atmosphere, and the retention time is 2 hours.
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