CN104150731A - Combined biochemical and physicochemical method for stabilizing heavy metals in city sludge - Google Patents
Combined biochemical and physicochemical method for stabilizing heavy metals in city sludge Download PDFInfo
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Abstract
The invention relates to a combined biochemical and physicochemical method for stabilizing heavy metals in city sludge. The method comprises the following steps: (1) carrying out hydrolytic acidification: introducing city sludge into a hydrolytic acidification tank to carry out primary hydrolytic acidification; (2) carrying out sulfate reduction: introducing the city sludge which has been processed in the step (1) into an anaerobic tank from the hydrolytic acidification tank by utilizing the self-gravity of the city sludge, reducing the sulfate in the city sludge into hydrogen sulfide by sulfate reducing bacteria; (3) carrying out thermal hydrolysis: introducing the city sludge which has been processed in the step (2) into a digestion tank from the anaerobic tank to carry out thermal hydrolysis, and then introducing the city sludge into a flash tank to cool to the room temperature and a normal pressure so as to obtain the city sludge with stabilized heavy metals. The provided method can make pollutants in the city sludge such as sulfide, heavy metals, and the like carry out anaerobic reactions to improve the ratio of heavy metals in a stable form so as to stabilize heavy metals without adding any heavy metal stabilizing agent.
Description
Technical field
The present invention relates to the innoxious treatment process of a kind of solid waste, relate to especially a kind for the treatment of process of biochemical-physical combination that adopts and municipal sludge is carried out to the method for heavy metal stabilization.
Background technology
When being a kind of disposing of sewage, municipal sludge carries out formed product in biodegradation process, its output is along with the enhancing that China's town domestic sewage focuses on ability grows with each passing day, by the end of the year 2010, China's sludge yield reaches 60,000 tons of wet mud/days (water ratio 80%), according to the national town sewage of < < " 12 ", process and regeneration Facilities Construction planning > >, within 2015, the whole nation is 10.4 ten thousand tons of wet mud/days (water ratio 80%) by the sludge quantity of generation, as can be seen here, sludge yield will be at rapid growth still from now on.
Municipal sludge not only contains the resources such as the required nitrogen of abundant plant, phosphorus, amino acid and trace element, and contain the organic matter that is of value in a large number chessom preserve moisture and fertility, mud is carried out to can be farm crop after harmless treatment and utilize, and in mud, contained heavy metal is a kind of key constraints that recycling sludge utilizes.Heavy metal contamination has extremely serious, lasting harm to human body, animals and plants, water body, soil ecosystem.
At present, the method for removal Heavy Metals in Sludge has chemical method, biological filter to drench method, stabilization method etc.Wherein chemical method and general stabilization method all need to consume a large amount of chemical agents, and biological filter drenches the effect that the validity of method is relied on the bacterial classifications such as thiobacillus ferrooxidant and thiobacillus thiooxidans completely, so treatment effect is affected by environment larger.
For example, thereby for comprising above-described some shortcomings part, people have researched and developed the technology of heavy metal in multiple lignin-sludge:
CN1061012A discloses a kind of method of removing sewage/Heavy Metals in Sludge, is mud is mixed with catalyst oxidant, regenerating oxidant and acid, forms active mud, then separated.
CN1273946A discloses the method for decomposing harmful chemical and heavy metal in mud, to utilize cyclodextrin and natural microbial mixed solution to process, wherein natural microbial is when decomposing digestion cyclodextrin, the heavy metal ion that oxidable cyclodextrin adheres to.
WO0109045A discloses the method for carrying out purifying city mud with hybrid chemical and biological process, mud is mixed with acid leaching vat, so that the pH value of mud is enough low and be enough to dissolve most of heavy metal, then apply redox potential to realize solid-liquid separation.
CN1436734A discloses a kind of crystallizing treatment process of heavy metal sewage sludge, mainly uses electrochemical redox and crystallization principle, by heavy metal sewage sludge by moltenly carrying, concentrate, the step such as crystallization, realize recovery and the utilization of heavy metal xln.
CN1544366A discloses a kind of method of lignin-sludge heavy metal, is to adopt sulfide and lime as fixing agent, realizes the stabilization of heavy metal, has reduced its leaching yield.
CN1631940A discloses the macromolecular heavy metal chelating agent for heavy metal sewage sludge, uses this sequestrant can make the heavy metal in mud realize stabilization.
WO2005035149A disclose a kind of from mud the method for separating beavy metal, that the mud that comprises heavy metal is supplied with in the cathodic area to reactive tank, under the existence of reducing atmosphere and strong acid or highly basic atmosphere gas, leaching ability of heavy metal electrolysis are analysed on cathode surface.
CN101265007A discloses and has adopted electric repairing technique to remove the method for heavy metals in city sewage sludge, wherein with poly-epoxy succinic acid, as complexing agent, strengthens the electromigration ability of heavy metal, and the clearance of heavy metal is reached more than 60%.
CN102701551A discloses a kind of industrial sludge treatment method, is in mud, to add non-conductor dispersion agent to nurse one's health, and high bake then, pulverizes and grind, and carries out heavy metal separated by wind and static.
CN102408177A discloses a kind of compound bio-enzyme for recycling sludge, after this cellulase treatment mud, through dehydration, with vegetable mould mixing granulation, mummification after obtain composite soil, this soil can be by heavy metals immobilization.
CN102503059A discloses the method for removing Heavy Metals in Sludge, is to utilize the pretreatment technology of multigelation to strengthen the electrokinetic process process that catholyte refluxes, thereby improves the removal efficiency of heavy metal.
CN102583916A discloses the method for removing Heavy Metals in Sludge, comprises use citric acid and hydrogen peroxide lixiviate heavy metal, microwave heating, solid-liquid separation, hydro-oxidation sodium Precipitation heavy metal, and citric acid solution wherein can be recycled.
The people such as Wang Jing (Wang Jing, pay ice-melt, Luo Qishi, Zhang Changbo, Xu Yanying, " the static stabilization research of ferrous salt to heavy metals in city sewage sludge ", < < environmental science > >, the 4th phase of 31 volumes, p.210-214, in April, 2010) in, disclose to combine and used ferrous salt and calcium hydroxide, can realize the good stabilization of Heavy Metals in Sludge, can keep suitable pH value simultaneously.
The form of heavy metal can be divided into sour molten state, reducible state, oxidable state and residual form by BCR method, and so-called stability generally refers to that oxidable state and residual form sum account for the ratio of heavy metal total content.Stabilization method is realized the raising of Heavy Metals in Sludge stability just by increasing the ratio of oxidable state and residual form.Stabilization method is from the different of additive method maximum in addition, its final purpose be reduce in mud can be bioavailable and in environmental system the continuous heavy metal content of migration, and usually in described chemical method and biological filter pouring method treatment process, heavy metal is transferred to enter and causes secondary pollution in water body.
Summary of the invention
Technical problem to be solved by this invention is a kind of method that realizes heavy metals in city sewage sludge stabilization of biochemical-physical combination that provides for the deficiency of above-mentioned prior art existence, do not add heavy metal stabilizer, effectively improve the ratio of Heavy Metals in Sludge stable form by Heavy Metals in Sludge stabilization.
The present invention is that the technical scheme that the problem of the above-mentioned proposition of solution adopts is:
A method that realizes heavy metals in city sewage sludge stabilization for biochemical-physical combination, comprises the steps:
(1) acidication: first municipal sludge enters hydrolysis acidification pool, carries out preliminary acidication;
(2) thermal hydrolysis: the municipal sludge of processing through above-mentioned steps (1) is entered to counteracting tank by hydrolysis acidification pool and carry out thermal hydrolysis, then enter flash tank and be down to room temperature normal pressure, be i.e. the municipal sludge of accomplished heavy metal stabilization.
The present invention also provides the method that realizes heavy metals in city sewage sludge stabilization of another kind of biochemical-physical combination, comprises the steps:
(1) sulfate reduction: first municipal sludge enters the anaerobic pond after sulphate reducing bacteria is bacterial classification inoculation domestication, and the sulfate reduction in described municipal sludge is become to hydrogen sulfide;
(2) thermal hydrolysis: the municipal sludge of processing through above-mentioned steps (1) is entered to counteracting tank by anaerobic pond and carry out thermal hydrolysis, then enter flash tank and be down to room temperature normal pressure, be i.e. the municipal sludge of accomplished heavy metal stabilization.
The present invention also provides the method that realizes heavy metals in city sewage sludge stabilization of best biochemical-physical combination, comprises the steps:
(1) acidication: first municipal sludge enters hydrolysis acidification pool, carries out preliminary acidication;
(2) sulfate reduction: the municipal sludge of processing through above-mentioned steps (1) is entered to the anaerobic pond after sulphate reducing bacteria is bacterial classification inoculation domestication by hydrolysis acidification pool mud run by gravity, the sulfate reduction in described municipal sludge is become to hydrogen sulfide;
(3) thermal hydrolysis: the municipal sludge of processing through above-mentioned steps (2) is entered to counteracting tank by anaerobic pond and carry out thermal hydrolysis, then enter flash tank and be down to room temperature normal pressure, be i.e. the municipal sludge of accomplished heavy metal stabilization.
Press such scheme, in described hydrolysis acidification pool, temperature remains on 20～35 ℃, and municipal sludge concentration remains on 10～20g/L, upflow velocity 0.8～1.8m/h in pond, regulating pH is 5～7, and stirring velocity is 80～100r/min, and the municipal sludge residence time is 2.5～4.5h.Wherein pH adopts mineral acid to regulate, and the present invention mainly adopts the sulfuric acid of mass concentration 50% to regulate; By stirring to prevent sludge settling, acidification reaction is better hydrolyzed.
Press such scheme, the temperature of described anaerobic pond remains on 20～40 ℃, and redox potential (Eh) must be lower than-100mV, and pH remains on 7-8, COD/SO
4 2-assurance is greater than 3.0, the municipal sludge residence time 10～15h.When sulfate reduction step combines with acidication step, the pH of anaerobic pond need to add alkali, and to regulate pH be 7-8, in the present invention as long as adopt lime; If municipal sludge does not directly carry out sulfate reduction step through acidication step, pH can remain on 7-8 without regulating.
Press such scheme, in described counteracting tank, temperature remains on 110～170 ℃, and pressure remains on 140kPa～790kPa, and the municipal sludge residence time remains on 15～30min.
Through applicant's research discovery repeatedly in a large number for a long time, acidication pre-treatment can effectively reduce operating temperature and the working time of subsequent technique, this is likely due at hydrolysis stage, the macromolecular substance wherein originally existing in part mud in advance hydrolysis is small-molecule substance, and then at souring stage, the micromolecular compound that hydrolysis forms is converted into more simple compound and is secreted into extracellular in the cell of acidifying bacterium, a large amount of exposed carboxyls, the functional groups such as phenolic hydroxyl group very easily with heavy metal generation complexing action, the stability of heavy metal obtains lifting to a certain extent, thereby reduced the heavy metal stabilization load of subsequent step.With aftertreatment technology, be that in mud, sulphate reducing bacteria has been created good anaerobic environment, the vitriol itself existing in mud effectively can be converted into negative divalent sulfur, certainly negative divalent sulfur can Individual existence, but the heavy metal with mud is reacted and generates heavy metal sulfide, make heavy metal toward more stable form transformation.Finally by mud is carried out to pyroprocessing, microorganism cells is broken by meeting under thermogenetic pressure difference effect, in cell, organism is released, with the coexist one-step hydrolysis that dissolves fast, goes forward side by side under high temperature action of the larger molecular organics one originally existing in mud be micromolecular organism, so this will be conducive to increase heavy metal and organic ligand (as carboxyl, phenolic hydroxyl group, carbonyl and nitrogenous Guan Tuandeng functional group) thus the probability of combination makes heavy metal be converted into more stable form.
Thermal hydrolysis step in aforesaid method can be considered technical process of the present invention, and acidication, as the pre-treatment of thermal hydrolysis, mainly plays the requirement of the operational conditions that reduces thermal hydrolysis; Sulfate reduction is also the pre-treatment as thermal hydrolysis, and its Main Function is the shared per-cent of stable form that improves Heavy Metals in Sludge.Therefore, the method that realizes heavy metals in city sewage sludge stabilization of biochemical-physical combination of the present invention can combine to realize with thermal hydrolysis step by acidication, also can combine to realize with thermal hydrolysis step by sulfate reduction, what can also combine by acidication, three steps of sulfate reduction and thermal hydrolysis reaches optimum handling effect.
Compared with prior art, the invention has the beneficial effects as follows:
A, biochemical pre-treatment effectively promotes the stabilization efficiency of Heavy Metals in Sludge: acidication step wherein, by the first one-step hydrolysis to the larger molecular organics originally existing in primary sludge, form the relatively little organism of molecular weight, then by acidifying bacterium, be transferred to cell space inside, further trans-utilization formation molecular weight is less, after more simple compound, discharge outside born of the same parents, exposed carboxyl, the functional groups such as phenolic hydroxyl group very easily with heavy metal generation complexing action, the stability of heavy metal obtains lifting to a certain extent, for follow-up pyrohydrolysis process has alleviated certain heavy metal stabilization load, in anaerobic pond, a large amount of sulphate reducing bacterias that exist are by self metabolism, the negative sulfidion that is lower valency by the vitriol deoxidation and reduction itself existing in mud, because outer field two the unsettled electronics of its electronics can be attracted to form stable heavy metal sulfide by heavy metal ion fast, obviously improved the stability of heavy metal.
B, the present invention are by the method (instant heating hydrolysis) of materialization, can make fast Heavy Metals in Sludge form stable: the pressure difference producing due to high temperature cannot bear microorganism wall broken wall occurs, intracellular organic matter flows out cell space, directly be exposed in born of the same parents' external environment and be no longer subject to cell walls protection, thereby having increased organic dissolving; Meanwhile, the energy that when chemical bond of macromolecular organism inside absorbs thermal hydrolysis, the external world provides and rupturing, thereby be hydrolyzed to small organic molecule, form a large amount of exposed functional groups (as carboxyl, phenolic hydroxyl group, carbonyl and nitrogenous Guan Tuandeng functional group), its quantity increase also will promote the complexing stability constant of some functional group and heavy metal to a certain extent, thereby effectively realizes the stabilization of Heavy Metals in Sludge.
C, whole technical process do not need to add extra medicament, and stability is strong, simple to operate.Acidication stability is high, and capacity of resisting impact load is strong, can guarantee the stability of subsequent technique, and running cost is low.
Of the present invention is in a kind of situation that does not add heavy metal stabilizer, utilize anaerobic reaction that each pollutants such as the sulfide self existing in mud and heavy metal are reacted, improve the ratio of Heavy Metals in Sludge stable form by Heavy Metals in Sludge stabilization, thereby reduce to a certain extent the disadvantageous effect of Heavy Metals in Sludge to environment.
Accompanying drawing explanation
Fig. 1 is process flow sheet.
Wherein, T1～T2: thermometer; P0～P3: tensimeter; V1～V7, V9: control valve; V8: check valve.
Embodiment
Below by specific embodiment, the present invention will be described; but should be appreciated that; these property enumerated embodiments are the use for giving an example only, and should not regard as any type of any restriction of real protection scope formation of the present invention, more should not regard protection scope of the present invention as and only be confined to this.
Measuring method (BCR) method that Heavy Metals distributes: take primary sludge as contrast, get the mud sample after processing under different technology conditions, the 100 order nylon mesh of milling after air-dry, adopt BCR improved method to measure the form of heavy metal, distribution (BCR method is the Heavy Metals measuring method that Europe proposes with reference to the European Community Bureau of Reference of interchange office, and this mechanism is the predecessor of the canonical measure of present European Union and mechanism for testing Standards Measurements and Testing Programme).Heavy metal can be divided into sour molten state, reducible state, oxidable state, residual form by BCR method in mud.Wherein, sour molten state, reducible state are unstable form, and oxidable state, residual form are stable state.
Choose copper and zinc in heavy metal below, in conjunction with specific examples, the invention will be further described, the concrete example of making but how this just implements technical solution of the present invention, and protection scope of the present invention is not only confined to this.
In following embodiment, municipal sludge used is the mud in Xiangyang City, Hubei Province sewage work dehydration workshop, its pH is 8.3～8.6, solid content (TS) is 14.67%～16.04%, ratio (VS/TS) organic and solid content is 55.4%～63.4%, all by percentage to the quality.Wherein the content of copper and zinc and form distribute as shown in table 1.
Table 1
In following embodiment, hydrolysis acidification pool is the good hydrolysis acidification pool of process debugging routinely, and inoculation has hydrolysis bacterium and acidifying bacterium, and the rate of vaccination of acidication bacterium is about 35%, and in anaerobic pond, sulphate reducing bacteria is that bacterial classification rate of vaccination is 45%.
The COD/SO of mud mixture in sulfate reduction step anaerobic pond in following embodiment
4 2-be greater than 3.0, because need sulphate reducing bacteria utilization SO wherein
4 2-, be reduced into H
2s, adds formic acid and regulates and make COD/SO as carbon source in the present invention
4 2-be greater than 3.0.But when adopting different mud, may, without adding formic acid, can make COD/SO
4 2-be greater than 3.0.
Embodiment 1
A method that realizes heavy metals in city sewage sludge stabilization for biochemical-physical combination, comprises the steps:
(1) acidication: first above-mentioned municipal sludge is entered to hydrolysis acidification pool, keep 30 ℃ of temperature, with 50% sulfuric acid, adjusting pH in hydrolysis acidification pool is 6, municipal sludge concentration remains on 20g/L, upflow velocity 0.8～1.1m/h in pond, rotating speed of agitator 90r/min, the municipal sludge residence time is 4.5h;
(2) sulfate reduction: be the anaerobic pond after bacterial classification inoculation is tamed by hydrolysis acidification pool mud run by gravity through sulphate reducing bacteria by the municipal sludge of processing through above-mentioned steps (1), the temperature of described anaerobic pond remains on 35 ℃, redox potential (Eh) is-120mV, with lime, regulate pH at 7-8, drop into the COD/SO that formic acid regulates the municipal sludge after this step process
4 2-be 4.1, the municipal sludge residence time is 15h;
(3) thermal hydrolysis: the municipal sludge of processing through above-mentioned steps (2) is entered to counteracting tank by anaerobic pond and carry out thermal hydrolysis, counteracting tank temperature remains on 170 ℃, insulation 30min, pressure remains on 790kPa; Then enter flash tank and be down to room temperature normal pressure, be i.e. the municipal sludge of accomplished heavy metal stabilization.
Get the municipal sludge sample of realizing heavy metal stabilization prepared by the present embodiment air-dry, milled after 100 mesh sieves, getting 1g mud sample adopts improvement BCR method to carry out morphological analysis, analytical results is as shown in table 2, and the total content of copper has increased by 16.77% compared to primary sludge, and wherein sour molten state does not detect, reducible state has reduced 24.24%, oxidable state has increased by 29.95%, and residual form has increased by 49.22%, and stable form has increased by 13.43%; The total content of zinc has increased by 2.91% compared to primary sludge, and wherein sour molten state has reduced 29.73%, and reducible state has reduced 26.74%, and oxidable state has increased by 29.22%, and residual form has increased by 91.12%, and stable form has increased by 21.48%.
Table 2
Embodiment 2
A method that realizes heavy metals in city sewage sludge stabilization for biochemical-physical combination, comprises the steps:
(1) acidication: (1) acidication: first above-mentioned municipal sludge is entered to hydrolysis acidification pool, keep 35 ℃ of temperature, with 50% sulfuric acid, adjusting pH in hydrolysis acidification pool is 6, municipal sludge concentration remains on 15g/L, upflow velocity 1.1～1.5m/h in pond, rotating speed of agitator 80r/min, the municipal sludge residence time is 3.5h;
(2) sulfate reduction: the municipal sludge of processing through above-mentioned steps (1) is entered to the anaerobic pond after sulphate reducing bacteria is bacterial classification inoculation domestication by hydrolysis acidification pool mud run by gravity, the temperature of described anaerobic pond remains on 30 ℃, redox potential (Eh) is-125mV, with lime, regulate pH at 7-8, drop into the COD/SO that formic acid regulates the municipal sludge after this step process
4 2-be 3.8, the municipal sludge residence time is 13h;
(3) thermal hydrolysis: the municipal sludge of processing through above-mentioned steps (2) is entered to counteracting tank by anaerobic pond and carry out thermal hydrolysis, counteracting tank temperature remains on 170 ℃, insulation 30min, pressure remains on 790kPa; Then enter flash tank and be down to room temperature normal pressure, be i.e. the municipal sludge of accomplished heavy metal stabilization.
Get the municipal sludge sample of realizing heavy metal stabilization prepared by the present embodiment air-dry, milled after 100 mesh sieves, getting 1g mud sample adopts improvement BCR method to carry out morphological analysis, analytical results is as shown in table 3, and the total content of copper has increased by 12.99% compared to primary sludge, and wherein sour molten state does not detect, reducible state has reduced 19.48%, oxidable state has increased by 13.84%, and residual form has increased by 50.43%, and stable form has increased by 11.67%; The total content of zinc has increased by 3.98% compared to primary sludge, and wherein sour molten state has reduced 30.80%, and reducible state has reduced 19.54%, and oxidable state has increased by 22.22%, and residual form has increased by 79.26%, and stable form has increased by 18.04%.
Table 3
Embodiment 3
A method that realizes heavy metals in city sewage sludge stabilization for biochemical-physical combination, comprises the steps:
(1) acidication: first above-mentioned municipal sludge is entered to hydrolysis acidification pool, keep 25 ℃ of temperature, with 50% sulfuric acid, adjusting pH in hydrolysis acidification pool is 6, municipal sludge concentration remains on 10g/L, upflow velocity 1.5～1.8m/h in pond, rotating speed of agitator 100r/min, the municipal sludge residence time is 2.5h;
(2) sulfate reduction: the municipal sludge of processing through above-mentioned steps (1) is entered to the anaerobic pond after sulphate reducing bacteria is bacterial classification inoculation domestication by hydrolysis acidification pool mud run by gravity, the temperature of described anaerobic pond remains on 25 ℃, redox potential (Eh) is-110mV, with lime, regulate pH at 7-8, drop into the COD/SO that formic acid regulates the municipal sludge after this step process
4 2-be 3.3, the municipal sludge residence time is 10h;
(3) thermal hydrolysis: the municipal sludge of processing through above-mentioned steps (2) is entered to counteracting tank by anaerobic pond and carry out thermal hydrolysis, counteracting tank temperature remains on 110 ℃, insulation 30min, pressure remains on 140kPa; Then enter flash tank and be down to room temperature normal pressure, be i.e. the municipal sludge of accomplished heavy metal stabilization.
Get the municipal sludge sample of realizing heavy metal stabilization prepared by the present embodiment air-dry, milled after 100 mesh sieves, getting 1g mud sample adopts improvement BCR method to carry out morphological analysis, analytical results is as shown in table 4, and the total content of copper has increased by 6.23% compared to primary sludge, and wherein sour molten state does not detect, reducible state has reduced 9.52%, oxidable state has increased by 10.51%, and residual form has increased by 26.09%, and stable form has increased by 7.82%; The total content of zinc has increased by 2.47% compared to primary sludge, and wherein sour molten state has reduced 13.54%, and reducible state has reduced 15.00%, and oxidable state has increased by 12.76%, and residual form has increased by 53.17%, and stable form has increased by 12.27%.
Table 4
Embodiment 4
A method that realizes heavy metals in city sewage sludge stabilization for biochemical-physical combination, comprises the steps:
(1) acidication: first above-mentioned municipal sludge is entered to hydrolysis acidification pool, keep 20 ℃ of temperature, with 50% sulfuric acid, adjusting pH in hydrolysis acidification pool is 6, municipal sludge concentration remains on 10g/L, upflow velocity 1.5～1.8m/h in pond, rotating speed of agitator 100r/min, the municipal sludge residence time is 2.5h;
(2) thermal hydrolysis: the municipal sludge of processing through above-mentioned steps (1) is entered to counteracting tank by anaerobic pond and carry out thermal hydrolysis, counteracting tank temperature remains on 110 ℃, insulation 30min, pressure remains on 140kPa; Then enter flash tank and be down to room temperature normal pressure, be i.e. the municipal sludge of accomplished heavy metal stabilization.
Get the municipal sludge sample of realizing heavy metal stabilization prepared by the present embodiment air-dry, milled after 100 mesh sieves, getting 1g mud sample adopts improvement BCR method to carry out morphological analysis, analytical results is as shown in table 5, and the total content of copper has increased by 5.33% compared to primary sludge, and wherein sour molten state does not detect, reducible state has reduced 6.06%, oxidable state has increased by 4.20%, and residual form has increased by 26.96%, and stable form has increased by 6.71%; The total content of zinc has increased by 0.95% compared to primary sludge, and wherein sour molten state has reduced 8.59%, and reducible state has reduced 8.03%, and oxidable state has increased by 2.88%, and residual form has increased by 20.27%, and stable form has increased by 5.30%.
Table 5
Embodiment 5
A method that realizes heavy metals in city sewage sludge stabilization for biochemical-physical combination, comprises the steps:
(1) sulfate reduction: above-mentioned municipal sludge is entered to the anaerobic pond after sulphate reducing bacteria is bacterial classification inoculation domestication, the temperature of described anaerobic pond remains on 25 ℃, redox potential (Eh) is-110mV, pH remains on 7-8, drops into the COD/SO that formic acid regulates the municipal sludge after this step process
4 2-be 3.3, the municipal sludge residence time is 10h;
(2) thermal hydrolysis: the municipal sludge of processing through above-mentioned steps (1) is entered to counteracting tank by anaerobic pond and carry out thermal hydrolysis, counteracting tank temperature remains on 110 ℃, insulation 30min, pressure remains on 140kPa; Then enter flash tank and be down to room temperature normal pressure, be i.e. the municipal sludge of accomplished heavy metal stabilization.
Get the municipal sludge sample of realizing heavy metal stabilization prepared by the present embodiment air-dry, milled after 100 mesh sieves, getting 1g mud sample adopts improvement BCR method to carry out morphological analysis, analytical results is as shown in table 6, and the total content of copper has increased by 3.65% compared to primary sludge, and wherein sour molten state does not detect, reducible state has reduced 3.25%, oxidable state has increased by 7.88%, and residual form has increased by 16.17%, and stable form has increased by 5.56%; The total content of zinc has increased by 4.72% compared to primary sludge, and wherein sour molten state has reduced 15.36%, and reducible state has reduced 6.35%, and oxidable state has increased by 8.23%, and residual form has increased by 25.31%, and stable form has increased by 6.20%.
Table 6
Although for for example and the object of description, and introduced above-described embodiment of the preferred embodiment for the present invention.But these embodiment are not detailed descriptions, scope of the present invention can not be confined to this.For a person skilled in the art, can make numerous modifications and variations to above-mentioned embodiment of the present invention, and these all modifications and variations are all included in the scope of the present invention that following claim limits, and do not depart from the scope and spirit of the present invention that limit as claim.
Claims (6)
1. a method that realizes heavy metals in city sewage sludge stabilization for biochemical-physical combination, is characterized in that comprising the steps:
(1) acidication: first municipal sludge enters hydrolysis acidification pool, carries out preliminary acidication;
(2) thermal hydrolysis: the municipal sludge of processing through above-mentioned steps (1) is entered to counteracting tank by hydrolysis acidification pool and carry out thermal hydrolysis, then enter flash tank and be down to room temperature normal pressure, be i.e. the municipal sludge of accomplished heavy metal stabilization.
2. a method that realizes heavy metals in city sewage sludge stabilization for biochemical-physical combination, is characterized in that comprising the steps:
(1) sulfate reduction: first municipal sludge enters the anaerobic pond after sulphate reducing bacteria is bacterial classification inoculation domestication, and the sulfate reduction in described municipal sludge is become to hydrogen sulfide;
(2) thermal hydrolysis: the municipal sludge of processing through above-mentioned steps (1) is entered to counteracting tank by anaerobic pond and carry out thermal hydrolysis, then enter flash tank and be down to room temperature normal pressure, be i.e. the municipal sludge of accomplished heavy metal stabilization.
3. a method that realizes heavy metals in city sewage sludge stabilization for biochemical-physical combination, is characterized in that comprising the steps:
(1) acidication: first municipal sludge enters hydrolysis acidification pool, carries out preliminary acidication;
(2) sulfate reduction: the municipal sludge of processing through above-mentioned steps (1) is entered to the anaerobic pond after sulphate reducing bacteria is bacterial classification inoculation domestication by hydrolysis acidification pool mud run by gravity, the sulfate reduction in described municipal sludge is become to hydrogen sulfide;
(3) thermal hydrolysis: the municipal sludge of processing through above-mentioned steps (2) is entered to counteracting tank by anaerobic pond and carry out thermal hydrolysis, then enter flash tank and be down to room temperature normal pressure, be i.e. the municipal sludge of accomplished heavy metal stabilization.
4. according to the method that realizes heavy metals in city sewage sludge stabilization of the biochemical-physical combination one of claim 1-3 Suo Shu, it is characterized in that in described hydrolysis acidification pool, city sludge concentration remains on 10～20g/L, upflow velocity 0.8～1.8m/h in pond, stirring velocity is 80～100r/min, regulating pH is 5～7, temperature remains on 20～35 ℃, and the municipal sludge residence time is 2.5～4.5h.
5. according to the method that realizes heavy metals in city sewage sludge stabilization of the biochemical-physical combination one of claim 1-3 Suo Shu, the temperature that it is characterized in that described anaerobic pond remains on 20～40 ℃, redox potential (Eh) must be lower than-100mV, and pH remains on 7-8, COD/SO
4 2-assurance is greater than 3.0, the municipal sludge residence time 10～15h.
6. according to the method that realizes heavy metals in city sewage sludge stabilization of the biochemical-physical combination one of claim 1-3 Suo Shu, it is characterized in that in described counteracting tank, temperature remains on 110～170 ℃, pressure remains on 140kPa～790kPa, and the municipal sludge residence time remains on 15～30min.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104649528A (en) * | 2015-01-28 | 2015-05-27 | 徐明好 | Treatment method of heavy metals in sludge |
| CN105541071A (en) * | 2015-12-29 | 2016-05-04 | 苏州工业园区中法环境技术有限公司 | Sequencing-batch pyrohydrolysis sludge treatment device and control method thereof |
| CN105950170A (en) * | 2016-05-30 | 2016-09-21 | 青岛理工大学 | Biogas residue based novel Cu in-situ detoxification method of contaminated site |
| CN108191193A (en) * | 2018-01-31 | 2018-06-22 | 宇星科技发展(深圳)有限公司 | Sludge heavy-metal, fertilizer point and energy recovery system and method |
| CN109231782A (en) * | 2018-10-17 | 2019-01-18 | 桂林理工大学 | The minimizing stabilization treatment method of Cd in a kind of municipal sludge |
| CN111875233A (en) * | 2020-07-30 | 2020-11-03 | 天津大学 | Quantitative analysis method for heavy metals in desulfurized sludge based on electric treatment |
| CN114702216A (en) * | 2022-03-16 | 2022-07-05 | 上海市政工程设计研究总院（集团）有限公司 | Digestion system, anaerobic digestion system for treating sludge and sewage and treatment method |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104649528A (en) * | 2015-01-28 | 2015-05-27 | 徐明好 | Treatment method of heavy metals in sludge |
| CN105541071A (en) * | 2015-12-29 | 2016-05-04 | 苏州工业园区中法环境技术有限公司 | Sequencing-batch pyrohydrolysis sludge treatment device and control method thereof |
| CN105950170A (en) * | 2016-05-30 | 2016-09-21 | 青岛理工大学 | Biogas residue based novel Cu in-situ detoxification method of contaminated site |
| CN108191193A (en) * | 2018-01-31 | 2018-06-22 | 宇星科技发展(深圳)有限公司 | Sludge heavy-metal, fertilizer point and energy recovery system and method |
| CN108191193B (en) * | 2018-01-31 | 2020-12-22 | 宇星科技发展(深圳)有限公司 | Sludge heavy metal, fertilizer and energy recovery system and method |
| CN109231782A (en) * | 2018-10-17 | 2019-01-18 | 桂林理工大学 | The minimizing stabilization treatment method of Cd in a kind of municipal sludge |
| CN111875233A (en) * | 2020-07-30 | 2020-11-03 | 天津大学 | Quantitative analysis method for heavy metals in desulfurized sludge based on electric treatment |
| CN111875233B (en) * | 2020-07-30 | 2022-11-04 | 天津大学 | Quantitative analysis method for heavy metals in desulfurized sludge based on electric treatment |
| CN114702216A (en) * | 2022-03-16 | 2022-07-05 | 上海市政工程设计研究总院（集团）有限公司 | Digestion system, anaerobic digestion system for treating sludge and sewage and treatment method |
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