CN112661375B - Method for deodorizing sludge through catalytic oxidation of hydroxyl radicals, deodorized sludge and application - Google Patents
Method for deodorizing sludge through catalytic oxidation of hydroxyl radicals, deodorized sludge and application Download PDFInfo
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Abstract
The invention belongs to the technical field of sludge treatment, and particularly relates to a method for deodorizing sludge through catalytic oxidation of hydroxyl radicals, deodorized sludge and application. The invention deodorizes the sludge by stages through the mixed solution of the hydroxyl radical excitant and the smoke suppressor, the mixed solution of the catalyst and the bactericide and the hydroxyl radical generator solution, has mild reaction, does not generate harmful gas, can carry out deodorization reaction by spraying on the surface of the sludge, and has simple process operation, low cost and strong applicability. The deodorizer obtained by mixing the agents has the effects of deodorizing and degressing odor generated in the two states of standing and burning of sludge, and provides a powerful deodorizing guarantee for resource utilization of sludge incineration power generation, brick making, pottery making, biochar preparation and the like.
Description
Technical Field
The invention belongs to the technical field of sludge treatment, and particularly relates to a method for deodorizing sludge through catalytic oxidation of hydroxyl radicals, deodorized sludge and application.
Background
The sludge is an associated substance generated by water body in various environment transfer, has complex components, remains a plurality of heavy metal elements, has a large amount of various microorganisms and organisms such as bacteria, fungi, viruses and the like, is easy to be decomposed and deteriorated, emits malodorous gas and harms the health of the ecological environment. The sludge types are divided into industrial wastewater sludge, domestic sewage sludge, drainage pipe sludge and water body bottom sludge from the source; the process flow comprises raw sludge, digested sludge and dewatered and dried sludge. The raw sludge discharged from the sedimentation tank is changed into digested sludge (the water content is more than 95%) through aerobic/anaerobic treatment, and is changed into dehydrated and dried sludge (the water content is 60-70%) through mechanical filter pressing or hot air drying, and then is subjected to final treatment such as incineration, composting, landfill and the like.
In the series of treatment processes, the sludge releases malodorous gases, which are easy to spread and cause significant pollution to public spaces, so that the sludge is strongly dissatisfied and becomes a hot spot of social attention, and therefore, the control of the malodorous gases of the sludge is a focus problem to be solved in recycling for sludge treatment.
The existing method for deodorizing sludge mainly comprises the following steps: the biological deodorization method mainly utilizes the physiological metabolism of microorganisms to convert substances emitting odor and remove the odor of sludge, and has the advantages of good effect, no secondary pollution and high cost and is easily influenced by environmental factors; secondly, a physical deodorization method, such as covering and sealing, hydroxyl carbon adsorption, a flash evaporation method, a collecting and burning method and the like, has the advantages of quick deodorization effect and low technical cost, and has the defect that the regeneration of stink cannot be prevented from the source; the chemical deodorization method uses chemical agents to react with odor substances in the sludge to remove the odor of the sludge, the deodorization is rapid, reasonable agent selection can prevent the regeneration of the odor from the source, the cost is low, the process is simple and convenient, and the method becomes an application hot door in the field of deodorization. However, the traditional chemical sludge deodorization methods have respective disadvantages, and cannot be considered from the perspective of resource utilization such as incineration, for example, most of deodorizers are mixed with chlorine-containing reagents, which results in the generation of a large amount of dioxin during sludge combustion, the toxicity of the dioxin is 130 times that of well-known toxic substances such as cyanide and 900 times that of arsenic, and the dioxin is extremely harmful to human bodies; when the CaO is scattered and smeared, the odor on the surface can be only absorbed by reaction, the odor cannot be thoroughly eliminated, the odor is still severe during combustion, and the like. In recent years, deodorization by utilizing the strong oxidizing property of active radicals has also entered the field of view.
In a patent CN201410431190.2, "an SRR deodorant for treating sludge malodor and its deodorizing method" discloses a deodorant which uses cobaltate as active radical activator, uses halogen radical source, hydroxyl radical source, etc. to deodorize sludge, and uses the strong oxidizing property of active radical to react with most odor source substances, however, the existence of various radicals can not play a good role in synergy, and there may be reaction interference.
In another patent CN201610696159.0, an ozone-hydroxyl radical combined catalytic oxidation sludge conditioning method, sludge with water content of 92-99.5% is added into a mixed solution of ferrous sulfate heptahydrate and sulfamic acid for mixed reaction; then adding liquid hydrogen peroxide solution for mixing reaction; the product after the reaction enters a strengthening reaction tank for aeration treatment, and gas is generated by a low-temperature plasma reactor and contains ozone, hydroxyl radicals, free electrons and the like, so that the wall breaking of sludge by oxidation is realized; and (4) the treated sludge product enters a plate-and-frame filter press for filter pressing to obtain a sludge cake with the water content of 50-62%. This patent mainly utilizes produced hydroxyl free radical of sludge conditioner to have stronger oxidability and destroys extracellular polymer and cell wall, makes the bound combination water release into the free water in the mud, changes the existence form of moisture in the mud, and the drainage passageway of the mud dehydration in-process of structure to make the mud dehydration more smooth, guaranteed that the stability of mud cake moisture content is up to standard. Therefore, the patent focuses on reducing the water content of the sludge, and does not pay attention to how to remove the sludge odor so as to better realize resource utilization.
Therefore, it is very important to develop a hydroxyl radical deodorization technology which is oriented to resource utilization ways such as sludge incineration, cracking or carbonization and has environmental friendliness.
Disclosure of Invention
In view of the above technical problems in the background art, it is desirable to provide a method for deodorizing sludge by catalytic oxidation of hydroxyl radicals, which is applicable to various types of sludge, and is guided by resource utilization approaches such as sludge incineration, pyrolysis or carbonization. According to the method, the odor source substances in the sludge are subjected to oxidation deodorization through extremely strong oxidizability of hydroxyl radicals, so that the problem that the existing deodorization process on the market lacks effective control over sludge combustion odor, and therefore resource utilization such as sludge incineration cannot be carried out is solved.
In order to achieve the above object, in a first aspect of the present invention, the inventors provide a method for deodorizing sludge by hydroxyl radical catalyzed oxidation, comprising the steps of:
putting 9040-9600 parts by weight of sludge to be deodorized into a stirring device, controlling the ambient temperature to be 25-40 ℃, uniformly spraying a mixed solution of 100-320 parts by weight of hydroxyl radical activator and 50-100 parts by weight of smoke suppressor on the surface of the sludge to be deodorized while stirring, and reacting for 30-90 min to obtain first pre-deodorized sludge;
uniformly spraying a mixed solution of 50-110 parts of catalyst and 50-110 parts of bactericide on the surface of the first pre-deodorized sludge while stirring, and reacting for 30-90 min to obtain second pre-deodorized sludge;
and uniformly spraying 150-320 parts of hydroxyl radical generating agent on the surface of the second pre-deodorized sludge while stirring, and standing for 24-48 hours.
Compared with the defects of other patents, the sludge deodorization process emphasizes adding of a hydroxyl radical exciting agent, a smoke suppressor, a catalyst, a bactericide and a hydroxyl radical generating agent by stages according to the generation and action mechanism of free radicals, scientifically regulates and controls reaction time, efficiently generates a large amount of hydroxyl radicals, continuously stirs in the process of adding drugs and spraying to enable the hydroxyl radicals to fully permeate, realizes thorough deodorization of sludge to the maximum extent, and can thoroughly and efficiently remove odor sources and harmful substances in the sludge, such as methyl sulfide, methyl mercaptan, dimethyl disulfide, carbon disulfide, trimethylamine, styrene, hydrogen sulfide, ammonia gas, humic amine and other odor compounds and toxic and harmful substances which are difficult to biodegrade. Meanwhile, the deodorization method does not introduce a halogen free radical source, prevents the generation of an additional highly toxic byproduct dioxin, and innovatively adds a smoke suppressor so as to effectively reduce smoke dust released in the sludge combustion process while removing the sludge odor, thereby providing a powerful deodorization guarantee for resource utilization of sludge incineration power generation, brick making, pottery making, biochar preparation and the like.
According to the invention, the sludge to be deodorized comprises industrial wastewater sludge, domestic sewage sludge, drainage canal sludge and/or water body sediment.
Preferably, according to the present invention, the sludge to be deodorized includes one or more of untreated primary precipitated sludge, secondary sedimentation tank excess sludge, digested sludge subjected to aerobic digestion or anaerobic digestion, and dewatered and dried sludge treated by plate-and-frame filtration, thermal drying, and the like.
Preferably, the hydroxyl radical excitant is a 15-60% aqueous solution of one or a mixture of several of ferrous sulfate, heteropoly blue, copper hydroxide hydrogen phosphate and copper cobaltosic cyanide in percentage by weight.
Preferably, the smoke suppressor is 0.5-5% aqueous solution of one or more of barium naphthenate, copper naphthenate, sodium dodecyl benzene sulfonate, sodium dodecyl sulfate, polyvinyl alcohol laurate and butyl lactate in percentage by weight.
Preferably, the catalyst is 1-10% aqueous solution of one or more of copper oxide, magnesium oxide, potassium permanganate and potassium ferrate in percentage by weight.
Preferably, the bactericide is a 2-10% aqueous solution of one or a mixture of copper sulfate, lime sulfur, copper hydroxide and cuprous oxide in percentage by weight.
Preferably, the hydroxyl radical generating agent is 10-30% aqueous solution of one or more of hydrogen peroxide, calcium peroxide, sodium peroxide, potassium peroxide, peroxyacetic acid, peroxydiphosphonic acid, peroxyacetic acid and cumyl peroxide in percentage by weight.
The mixed solution of the hydroxyl radical excitant and the smoke suppressor, the mixed solution of the catalyst and the bactericide and the hydroxyl radical generator solution added in the invention are dilute solutions, the reaction is mild, no harmful gas is generated, the deodorization reaction can be carried out by spraying the mixed solution on the surface of the sludge, the process operation is simple, the cost is low, and the applicability is strong. The deodorizer obtained by mixing the agents has the effects of deodorizing and degressing odor generated in the two states of standing and burning of sludge, and provides a powerful deodorizing guarantee for resource utilization of sludge incineration power generation, brick making, pottery making, biochar preparation and the like.
In a second aspect of the invention, the inventors provide a deodorized sludge produced by the method of the first aspect of the invention.
The application of the deodorized sludge of the third aspect of the present invention means that the deodorized sludge of the second aspect of the present invention is used for resource utilization such as incineration power generation, brick making, ceramics making, biochar preparation, and the like.
Different from the prior art, the technical scheme at least has the following beneficial effects:
1. the method removes the sludge odor through the catalytic oxidation of hydroxyl radicals generated by chemical agents, meets the principle of sludge harmlessness, and thoroughly removes odor compounds and toxic and harmful substances which are difficult to biodegrade, such as methyl sulfide, methyl mercaptan, dimethyl disulfide, carbon disulfide, trimethylamine, styrene, hydrogen sulfide, ammonia gas, humic amine and the like by utilizing the reaction modes of atomic extraction, pi bond addition, fragmentation, disproportionation, electron transfer, nucleophilic reagent addition and the like of the generated hydroxyl radicals so as to achieve the deep deodorization of the sludge.
2. The method for deodorizing sludge through catalytic oxidation of hydroxyl radicals meets the sludge reduction principle, and because the sludge contains a large number of microorganisms, part of water of the sludge is surrounded in cell membranes of the microorganisms, such as cell sap, the internal water is tightly combined with solids, the cell membranes must be damaged to remove the water, and the hydroxyl radicals have a very obvious effect on damaging tissues and cells of organisms, so that a protective layer of the microorganisms can be easily broken, the outflow of the internal liquid is accelerated, and the dehydration and drying degree and efficiency are improved.
3. The method for deodorizing sludge by catalytic oxidation of hydroxyl radicals meets the resource utilization principle of sludge, the used medicament is low in price and convenient to obtain, the dilute solution of the medicament is added in the deodorizing process, the reaction is mild, no harmful gas is generated, and no new pollution is generated.
Detailed Description
In order to explain technical contents, structural features, and objects and effects of the technical means in detail, the following detailed description is given with reference to specific embodiments. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present application.
Example one
Method for deodorizing sludge through catalytic oxidation of hydroxyl radicals, deodorized sludge and application
The embodiment provides a method for deodorizing sludge through catalytic oxidation of hydroxyl radicals, which specifically comprises the following steps:
9300 parts of raw sludge to be deodorized from domestic sewage is placed in a stirring device, the environmental temperature is controlled to be 25 ℃, a mixed solution of 100 parts of hydroxyl radical exciting agent and 100 parts of smoke suppressor is uniformly sprayed on the surface of the raw sludge to be deodorized at 300L/h under the stirring speed of 5r/min, after the spraying is finished, the mixed solution is continuously reacted for 90min, a mixed solution of 70 parts of catalyst and 110 parts of bactericide is uniformly sprayed on the surface of the sludge at 300L/h under the stirring speed of 5r/min, after the spraying is finished, the reaction is continuously performed for 90min, 320 parts of hydroxyl radical generating agent is uniformly sprayed on the surface of the sludge at 300L/h under the stirring speed of 5r/min, after the spraying is finished, the standing is performed for 48h, and the odor is completely eliminated, so that the deodorized sludge is obtained.
In this embodiment, the hydroxyl radical initiator is a 30% ferrous sulfate aqueous solution. In other specific different embodiments, ferrous sulfate can be replaced by one of heteropoly blue, copper hydroxide phosphate and copper cobaltosic cyanide according to the same weight percentage, or a mixture formed by any combination of the ferrous sulfate, heteropoly blue, copper hydroxide phosphate and copper cobaltosic cyanide according to the same weight percentage can be replaced, so that the qualified hydroxyl radical initiator can be obtained, and the properties of the obtained product are not obviously different.
In this embodiment, the smoke suppressor is 0.5% by weight of an aqueous solution of sodium dodecylbenzenesulfonate. In other specific different embodiments, the sodium dodecylbenzene sulfonate can be replaced by one of barium naphthenate, copper naphthenate, sodium dodecylbenzene sulfonate, polyvinyl alcohol laurate and butyl lactate according to the same weight percentage, or a mixture formed by any combination of barium naphthenate, copper naphthenate, sodium dodecylbenzene sulfonate, polyvinyl alcohol laurate and butyl lactate according to the same weight percentage can be used for obtaining the qualified smoke suppressor, and the properties of the obtained product have no obvious difference.
In this example, the catalyst was a 2 weight percent copper oxide solution. In other specific different embodiments, the qualified catalyst can be obtained by replacing copper oxide by one of magnesium oxide, potassium permanganate and potassium ferrate according to the same weight percentage, or by replacing the copper oxide by a mixture formed by any combination of copper oxide, magnesium oxide, potassium permanganate and potassium ferrate according to the same weight percentage, and the properties of the obtained product have no obvious difference.
In this example, the bactericide is a 2% copper sulfate solution by weight. In other specific different embodiments, the copper sulfate can be replaced by one of lime sulphur, copper hydroxide and cuprous oxide according to the same weight percentage, or replaced by a mixture formed by any combination of the copper sulfate, the lime sulphur, the copper hydroxide and the cuprous oxide according to the same weight percentage, so that the qualified bactericide can be obtained, and the properties of the obtained product have no obvious difference.
In this embodiment, the hydroxyl radical generator is a 10% hydrogen peroxide solution by weight. In other specific different embodiments, the hydrogen peroxide can be replaced by calcium peroxide, sodium peroxide, potassium peroxide, peracetic acid, peroxydiphosphoric acid, peroxyacetic acid and cumyl peroxide according to the same weight percentage, or a mixture formed by any combination of the hydrogen peroxide, the calcium peroxide, the sodium peroxide, the potassium peroxide, the peroxyacetic acid, the peroxydiphosphonic acid, the peroxyacetic acid and the cumyl peroxide according to the same weight percentage, so that the qualified hydroxyl radical generating agent can be obtained, and the properties of the obtained product are not obviously different.
Example two
The difference between the embodiment and the first embodiment is that 9300 parts of sludge to be deodorized and digested from domestic sewage is placed in a stirring device, the environmental temperature is controlled to be 35 ℃, a mixed solution of 300 parts of hydroxyl radical exciting agent and 50 parts of smoke suppressor is uniformly sprayed on the surface of the sludge at a spraying speed of 300L/h under a stirring speed of 20r/min, after the spraying is finished, the mixed solution of 100 parts of catalyst and 70 parts of bactericide is uniformly sprayed on the surface of the sludge at a stirring speed of 15r/min after the reaction is continued for 30min, after the spraying is finished, 180 parts of hydroxyl radical generating agent is uniformly sprayed on the surface of the sludge at a stirring speed of 20r/min after the reaction is continued for 30min, after the spraying is finished, the standing is carried out for 24h, and the odor is completely eliminated, so that the deodorized sludge is obtained.
EXAMPLE III
The difference between the embodiment and the first embodiment is that 9300 parts of sludge to be deodorized, which is obtained by dewatering and drying domestic sewage, is placed in a stirring device, the environmental temperature is controlled to be 30 ℃, a mixed solution of 200 parts of hydroxyl radical activator and 70 parts of smoke suppressor is uniformly sprayed on the surface of the sludge at 400L/h at a stirring speed of 10r/min, after the spraying is finished, the mixed solution of 80 parts of catalyst and 90 parts of bactericide is uniformly sprayed on the surface of the sludge at 400L/h at a stirring speed of 10r/min after the reaction is continued for 60min, 260 parts of hydroxyl radical generator is uniformly sprayed on the surface of the sludge at 400L/h at a stirring speed of 60r/min after the spraying is finished, the standing is carried out for 36h, and the odor is completely eliminated, so that the deodorized sludge is obtained. In this embodiment, the hydroxyl radical initiator is a ferrous sulfate aqueous solution with a weight percentage of 20%, the smoke suppressor is a sodium dodecyl benzene sulfonate aqueous solution with a weight percentage of 1%, the catalyst is a copper oxide solution with a weight percentage of 5%, the bactericide is a copper sulfate solution with a weight percentage of 5%, and the hydroxyl radical generator is a hydrogen peroxide solution with a weight percentage of 15%.
Example four
The difference between the embodiment and the third embodiment is that 9040 parts of raw sludge from a drainage pipe canal is placed in a stirring device, the environment temperature is controlled to be 30 ℃, a mixed solution of 320 parts of hydroxyl radical exciting agent and 100 parts of smoke suppressor is uniformly sprayed on the surface of the sludge at 300L/h under the stirring speed of 15r/min, after the spraying is finished, the reaction is continued for 30min, a mixed solution of 110 parts of catalyst and 110 parts of bactericide is uniformly sprayed on the surface of the sludge at 500L/h under the stirring speed of 15r/min, after the spraying is finished, the reaction is continued for 60min, 320 parts of hydroxyl radical generating agent is uniformly sprayed on the surface of the sludge at 500L/h under the stirring speed of 15r/min, after the spraying is finished, the standing is carried out for 36h, and the odor is completely eliminated, so that the deodorized sludge is obtained. In this embodiment, the catalyst is a copper oxide solution with a weight percentage of 2%, and the bactericide is a copper sulfate solution with a weight percentage of 2%.
EXAMPLE five
The difference between the embodiment and the third embodiment is that 9600 parts of raw sludge from water body bottom sludge is put into a stirring device, the environmental temperature is controlled to be 35 ℃, a mixed solution of 100 parts of hydroxyl radical exciting agent and 50 parts of smoke suppressor is uniformly sprayed on the surface of the sludge at 300L/h under the stirring speed of 15r/min, after the spraying is finished, the reaction is continued for 30min, a mixed solution of 50 parts of catalyst and 50 parts of bactericide is uniformly sprayed on the surface of the sludge at 300L/h under the stirring speed of 15r/min, after the spraying is finished, the reaction is continued for 30min, 150 parts of hydroxyl radical generating agent is uniformly sprayed on the surface of the sludge at 300L/h under the stirring speed of 15r/min, after the spraying is finished, the standing is carried out for 24h, and the odor is completely eliminated, so that the deodorized sludge is obtained.
EXAMPLE six
The difference between the embodiment and the third embodiment is that 9300 parts of raw sludge from industrial wastewater is put into a stirring device, the environmental temperature is controlled to be 40 ℃, a mixed solution of 320 parts of hydroxyl radical activator and 70 parts of smoke suppressor is uniformly sprayed on the surface of the sludge at 300L/h under the stirring speed of 20r/min, after the spraying is finished, the mixed solution of 110 parts of catalyst and 50 parts of bactericide is uniformly sprayed on the surface of the sludge at 600L/h under the stirring speed of 15r/min after the reaction is continued for 30min, 150 parts of hydroxyl radical generator is uniformly sprayed on the surface of the sludge at 600L/h under the stirring speed of 60r/min after the spraying is finished, the reaction is continued for 30min, and after the spraying is finished, the odor is completely eliminated for 24h, and the deodorized sludge is obtained.
EXAMPLE seven
The deodorized sludge obtained by the sludge deodorization methods of examples one to six was subjected to detection and analysis of deodorization data, and the gas indexes of ammonia gas (including ammonia gas indexes in both a standing state and a combustion state) and hydrogen sulfide obtained by a gas detector were listed in tables 1 and 2.
Table 1 example-ammonia gas detection index before and after six sludge deodorization
Table 2 example-index of hydrogen sulfide detection before and after deodorization of six sludge
According to the data in tables 1 and 2, the emission data of ammonia gas and hydrogen sulfide before and after the sludge deodorant prepared in examples 1 to 6 and the process treatment thereof were shown in tables 3 and 4, with the general gas emission flow rate of 300m/s as a standard.
TABLE 3 example one-six Ammonia emission values before and after sludge deodorization
Table 4 examples-hydrogen sulfide emission values before and after deodorization of six sludges
Table 5 shows emission standards of ammonia and hydrogen sulfide as listed in emission standards of malodorous pollutants (GB14554-93) in the national environmental protection standards.
TABLE 5 emission Standard of malodorous pollutants Ammonia and Hydrogen sulfide (GB14554-93)
The emission standards of ammonia and hydrogen sulfide listed in national environmental protection Standard emission Standard of malodorous pollutants (GB14554-93) in Table 5 are compared. After the technical scheme of the invention is utilized to deodorize the sludge, the height standard of an ammonia exhaust funnel is reduced from 30m to 15m when the sludge is kept still; the height standard of the ammonia gas exhaust cylinder is reduced from 60m to 30m when the sludge is combusted. After the technical scheme of the invention is utilized to deodorize the sludge, the height standard of the hydrogen sulfide exhaust funnel is reduced from 25m to 15m when the sludge is kept still; the height standard of the hydrogen sulfide exhaust cylinder during sludge combustion is reduced from 40m to 15 m.
Meanwhile, the smoke dust amount released in the sludge combustion process is also greatly reduced.
The deodorized sludge obtained by the sludge deodorization method can be applied to resource utilization aspects such as incineration power generation, brick making, pottery making, biochar preparation and the like, and has good energy-saving emission reduction and resource recycling benefits.
It should be noted that, although the above embodiments have been described herein, the invention is not limited thereto. Therefore, based on the innovative concepts of the present invention, the technical solutions of the present invention can be directly or indirectly applied to other related technical fields by making changes and modifications to the embodiments described herein or by using equivalent structures or equivalent processes performed in the present specification, and are included in the scope of the present invention.
Claims (5)
1. The method for deodorizing sludge through catalytic oxidation of hydroxyl radicals is characterized by comprising the following steps:
putting 9040-9600 parts of sludge to be deodorized into a stirring device, controlling the ambient temperature to be 25-40 ℃, uniformly spraying a mixed solution of 100-320 parts of hydroxyl radical activator and 50-100 parts of smoke suppressor on the surface of the sludge to be deodorized while stirring, and reacting for 30-90 min to obtain first sludge to be deodorized, wherein the hydroxyl radical activator is a 15-60% aqueous solution of one or more of ferrous sulfate, heteropolyblue, copper oxide hydrogen phosphate and copper cobaltoside, and the smoke suppressor is a 0.5-5% aqueous solution of one or more of barium naphthenate, copper naphthenate, sodium dodecyl benzene sulfonate, sodium dodecyl sulfonate, polyvinyl alcohol laurate and butyl lactate;
uniformly spraying a mixed solution of 50-110 parts of catalyst and 50-110 parts of bactericide on the surface of the first pre-deodorization sludge while stirring, and reacting for 30-90 min to obtain second pre-deodorization sludge, wherein the catalyst is a 1-10% aqueous solution of one or more of copper oxide, magnesium oxide, potassium permanganate and potassium ferrate, and the bactericide is a 2-10% aqueous solution of one or more of copper sulfate, lime sulfur, copper hydroxide and cuprous oxide;
uniformly spraying 150-320 parts of hydroxyl radical generating agent on the surface of the second pre-deodorized sludge while stirring, and standing for 24-48 hours to obtain the deodorized sludge, wherein the hydroxyl radical generating agent is 10-30% aqueous solution of one or more of hydrogen peroxide, calcium peroxide, sodium peroxide, potassium peroxide, peroxyacetic acid, peroxydiphosphonic acid, peroxyacetic acid and cumyl peroxide.
2. The method of claim 1, wherein the sludge to be deodorized comprises industrial wastewater sludge, domestic sewage sludge, sewer sludge, and/or water body sediment.
3. The method according to claim 2, wherein the sludge to be deodorized comprises one or more of untreated primary precipitated sludge, secondary sedimentation tank excess sludge, digested sludge subjected to aerobic digestion or anaerobic digestion, and dewatered and dried sludge treated by plate-and-frame filtration and thermal drying.
4. A deodorized sludge produced by the method of any one of claims 1-3.
5. Use of the deodorized sludge of claim 4.
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