CN104150731B - A kind of method realizing heavy metals in city sewage sludge stabilization that biochemical-physical combines - Google Patents
A kind of method realizing heavy metals in city sewage sludge stabilization that biochemical-physical combines Download PDFInfo
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Abstract
The present invention relates to a kind of method realizing heavy metals in city sewage sludge stabilization that biochemical-physical combines, it comprises the steps: (1) acidication: first municipal sludge enters hydrolysis acidification pool, carries out initial hydrolysis acidifying; (2) sulfate reduction: the municipal sludge that will process through above-mentioned steps (1) flows into anaerobic pond by hydrolysis acidification pool mud gravity, take sulphate reducing bacteria as bacterial classification, the sulfate reduction in described municipal sludge is become hydrogen sulfide; (3) thermal hydrolysis: the municipal sludge processed through above-mentioned steps (2) is entered counteracting tank by anaerobic pond and carries out thermal hydrolysis, then enters flash tank and is down to room temperature normal pressure, be i.e. the municipal sludge of accomplished heavy metal stabilization.Of the present invention is a kind of when not adding heavy metal stabilizer, utilize anaerobic reaction to be reacted by each pollutants such as the sulfide of self existence in mud and heavy metal, improve the ratio of Heavy Metals in Sludge stable form by Heavy Metals in Sludge stabilization.
Description
Technical field
The present invention relates to the treatment process that a kind of solid waste is innoxious, particularly a kind for the treatment of process adopting biochemical-physical to combine carries out the method for heavy metal stabilization to municipal sludge.
Background technology
The product formed in biodegradation process is carried out when municipal sludge is a kind of disposing of sewage, the enhancing that its output focuses on ability along with China's town domestic sewage 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 " " 12 " national urban wastewater treatment and the planning of regeneration Facilities Construction ", within 2015, the sludge quantity of generation is 10.4 ten thousand tons of wet mud/days (water ratio 80%) by the whole nation, as can be seen here, sludge yield will still increase from now on fast.
Municipal sludge is not only containing resources such as the abundant nitrogen needed for plant, phosphorus, amino acid and trace elements, and containing being of value to the organic matter of chessom preserve moisture and fertility in a large number, can be farm crop after mud is carried out harmless treatment utilized, and heavy metal contained in mud 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 removing 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 the validity of biological filter pouring method relies on the effect of the bacterial classification such as thiobacillus ferrooxidant and thiobacillus thiooxidans completely, and therefore treatment effect is affected by environment larger.
Thus, for comprising above-described some shortcomings part, people have developed the technology of heavy metal in multiple lignin-sludge, such as:
CN1061012A discloses a kind of method removing sewage/Heavy Metals in Sludge, is to be mixed with catalyst oxidant, regenerating oxidant and acid by mud, forms activated sludge, is then separated.
CN1273946A discloses the method for decomposing harmful chemical and heavy metal in mud, utilize cyclodextrin and natural microbial mixed solution to process, wherein natural microbial is while decomposition digestion cyclodextrin, the heavy metal ion that oxidable cyclodextrin adheres to.
WO0109045A discloses the method using hybrid chemical and biological process to carry out purifying city mud, mud is mixed with acid leaching vat, to make the pH value of mud enough low and to 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, main uses electrochemical redox and crystallization principle, by heavy metal sewage sludge by moltenly carrying, concentrating, 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, reduces its leaching yield.
CN1631940A discloses the macromolecular heavy metal chelating agent for heavy metal sewage sludge, uses this sequestrant that the heavy metal in mud can be made to realize stabilization.
WO2005035149A discloses a kind of method of separating beavy metal from mud, that the mud comprising heavy metal is supplied in the cathodic area to reactive tank, under the existence of reducing atmosphere and strong acid or highly basic atmosphere gas, make leaching ability of heavy metal and electrolysis is analysed on cathode surface.
CN101265007A discloses the method adopting electric repairing technique to remove heavy metals in city sewage sludge, and wherein use poly-epoxy succinic acid to strengthen the electromigration ability of heavy metal as complexing agent, the clearance of heavy metal reaches more than 60%.
CN102701551A discloses a kind of industrial sludge treatment method, is in mud, to add non-conductor dispersion agent nurse one's health, then high bake, pulverizes grinding, carries out heavy metal be separated by wind and electrostatic.
CN102408177A discloses a kind of compound bio-enzyme for recycling sludge, and after this cellulase treatment mud, through dehydration, obtain composite soil with vegetable mould mixing granulation, after mummification, this soil can by heavy metals immobilization.
CN102503059A discloses the method removing Heavy Metals in Sludge, is to utilize the pretreatment technology of multigelation to strengthen the electrokinetic process process of catholyte backflow, thus improves the removal efficiency of heavy metal.
CN102583916A discloses and removes the method for Heavy Metals in Sludge, and comprise with citric acid and hydrogen peroxide lixiviate heavy metal, microwave heating, solid-liquid separation, hydro-oxidation sodium Precipitation heavy metal, citric acid solution wherein can be recycled.
The people such as Wang Jing (Wang Jing, pay ice-melt, Luo Qishi, Zhang Changbo, Xu Yanying, " ferrous salt is studied the static stabilization of heavy metals in city sewage sludge ", " environmental science ", 31 volumes the 4th phase, p.210-214, in April, 2010) in disclose conbined usage ferrous salt and calcium hydroxide, the good stabilization of Heavy Metals in Sludge can be realized, simultaneously can keep suitable pH value.
The form of heavy metal can be divided into acid-soluble 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 realizes the raising of Heavy Metals in Sludge stability just by the ratio increasing oxidable state and residual form.Maximum different of stabilization method and additive method are in addition, its final purpose is that reduce in mud can bioavailable and heavy metal content that is constantly migration in environmental system, and usually described chemical method and biological filter drench in method treatment process, heavy metal is transferred to enter in water body and causes secondary pollution.
Summary of the invention
Technical problem to be solved by this invention is the deficiency and a kind of method realizing heavy metals in city sewage sludge stabilization providing biochemical-physical to combine that exist for above-mentioned prior art, do not add heavy metal stabilizer, effectively improve the ratio of Heavy Metals in Sludge stable form by Heavy Metals in Sludge stabilization.
The technical scheme that the problem that the present invention is the above-mentioned proposition of solution adopts is:
The method realizing heavy metals in city sewage sludge stabilization that biochemical-physical combines, comprises the steps:
(1) acidication: first municipal sludge enters hydrolysis acidification pool, carries out initial hydrolysis acidifying;
(2) thermal hydrolysis: the municipal sludge processed through above-mentioned steps (1) is entered counteracting tank by hydrolysis acidification pool and carries out thermal hydrolysis, then enters flash tank and is down to room temperature normal pressure, be i.e. the municipal sludge of accomplished heavy metal stabilization.
Present invention also offers the method realizing heavy metals in city sewage sludge stabilization that another kind of biochemical-physical combines, comprise the steps:
(1) sulfate reduction: municipal sludge first enter through sulphate reducing bacteria be strain inoculation domestication after anaerobic pond, the sulfate reduction in described municipal sludge is become hydrogen sulfide;
(2) thermal hydrolysis: the municipal sludge processed through above-mentioned steps (1) is entered counteracting tank by anaerobic pond and carries out thermal hydrolysis, then enters flash tank and is down to room temperature normal pressure, be i.e. the municipal sludge of accomplished heavy metal stabilization.
Present invention also offers the method realizing heavy metals in city sewage sludge stabilization that best biochemical-physical combines, comprise the steps:
(1) acidication: first municipal sludge enters hydrolysis acidification pool, carries out initial hydrolysis acidifying;
(2) sulfate reduction: by the municipal sludge processed through above-mentioned steps (1) by hydrolysis acidification pool mud run by gravity enter through sulphate reducing bacteria be strain inoculation tame after anaerobic pond, the sulfate reduction in described municipal sludge is become hydrogen sulfide;
(3) thermal hydrolysis: the municipal sludge processed through above-mentioned steps (2) is entered counteracting tank by anaerobic pond and carries out thermal hydrolysis, then enters flash tank and is down to room temperature normal pressure, be i.e. the municipal sludge of accomplished heavy metal stabilization.
By such scheme, in described hydrolysis acidification pool, temperature remains on 20 ~ 35 DEG C, and municipal sludge concentration remains on 10 ~ 20g/L, upflow velocity 0.8 ~ 1.8m/h in pond, regulate pH to be 5 ~ 7, 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, be hydrolyzed acidification reaction better.
By such scheme, the temperature of described anaerobic pond remains on 20 ~ 40 DEG C, and redox potential (Eh) must remain on 7-8 lower than-100mV, pH, COD/SO
4 2-guarantee is greater than 3.0, the municipal sludge residence time 10 ~ 15h.When sulphate reduction step combines with acidication step, the pH of anaerobic pond needs to add alkali to regulate pH for 7-8, as long as adopt lime in the present invention; If municipal sludge directly carries out sulphate reduction step without acidication step, then pH can remain on 7-8 without the need to regulating.
By such scheme, in described counteracting tank, temperature remains on 110 ~ 170 DEG C, and pressure remains on 140kPa ~ 790kPa, and the municipal sludge residence time remains on 15 ~ 30min.
Repeatedly discovery is studied in a large number for a long time through applicant, acidication pre-treatment effectively can reduce operating temperature and the working time of subsequent technique, this is likely due at hydrolysis stage, the macromolecular substance wherein originally existed in partial sludge in advance hydrolysis is small-molecule substance, and then at souring stage, the micromolecular compound that hydrolysis is formed is more simple compound at the cellular transformation of acidifying bacterium and is secreted into extracellular, carboxyl exposed in a large number, 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, thus reduce the heavy metal stabilization load of subsequent step.Be that in mud, sulphate reducing bacteria creates good anaerobic environment with aftertreatment technology, the vitriol that in mud, itself exists effectively can be converted into negative divalent sulfur, certainly negative divalent sulfur can not Individual existence, but generate heavy metal sulfide by reacting with the heavy metal in mud, make heavy metal toward more stable form transformation.Pyroprocessing is carried out finally by mud, microorganism cells can break by under thermogenetic pressure difference effect, in cell, organism is released, be micromolecular organism with coexist rapid solution under high temperature action, an one-step hydrolysis of going forward side by side of the larger molecular organics one originally existed in mud, therefore this will be conducive to the probability that increase heavy metal and organic ligand (as carboxyl, phenolic hydroxyl group, carbonyl and nitrogenous Guan Tuandeng functional group) combine thus make 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 reducing thermal hydrolysis; Sulfate reduction is also the pre-treatment as thermal hydrolysis, and its Main Function is the per-cent shared by stable form improving Heavy Metals in Sludge.Therefore, the method realizing heavy metals in city sewage sludge stabilization that biochemical-physical of the present invention combines can be combined with thermal hydrolysis step by acidication and realize, also can be combined with thermal hydrolysis step by sulfate reduction and realize, what can also be combined by acidication, sulfate reduction and thermal hydrolysis three steps 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 initial hydrolysis to the larger molecular organics originally existed in primary sludge, form the organism that molecular weight is relatively little, then cell space inside is transferred to by acidifying bacterium, it is less that further trans-utilization forms molecular weight, discharge outside born of the same parents after more simple compound, 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 alleviates certain heavy metal stabilization load, in anaerobic pond, a large amount of sulphate reducing bacteria existed is by own metabolism effect, by the negative sulfidion that the vitriol deoxidation and reduction itself existed in mud is lower valency, because outer field two the unstable electronics of its electronics can be attracted by heavy metal ion fast and form stable heavy metal sulfide, significantly improve the stability of heavy metal.
B, the present invention are by the method (instant heating hydrolysis) of materialization, Heavy Metals in Sludge form stable can be made fast: the pressure difference due to high temperature generation makes microorganism wall to bear and broken wall occurs, intracellular organic matter flows out cell space, directly be exposed in born of the same parents' external environment and no longer protect by cell walls, thus adding organic dissolving; Meanwhile, the extraneous energy that the provides when chemical bond of macromolecular organism inside absorbs thermal hydrolysis and rupturing, thus be hydrolyzed to small organic molecule, form functional group (as carboxyl, phenolic hydroxyl group, carbonyl and nitrogenous Guan Tuandeng functional group) exposed in a large number, its quantity increase also will promote the complexing stability constant of some functional group and heavy metal to a certain extent, thus 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, and can ensure the stability of subsequent technique, running cost is low.
Of the present invention is a kind of when not adding heavy metal stabilizer, anaerobic reaction is utilized to be reacted by each pollutants such as the sulfide of self existence in mud and heavy metal, improve the ratio of Heavy Metals in Sludge stable form by Heavy Metals in Sludge stabilization, thus reduce Heavy Metals in Sludge to a certain extent to the disadvantageous effect of 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 only for the use of citing, and should not regarded as any type of any restriction of real protection scope formation of the present invention, more should not regard as protection scope of the present invention and only be confined to this.
Measuring method (BCR) method of Heavy Metals distribution: take primary sludge as contrast, mud sample after processing under getting different technology conditions, air-dry rear milled 100 order nylon mesh, employing BCR improved method measures form, the distribution (BCR method is the Heavy Metals measuring method that Europe proposes with reference to interchange office EuropeanCommunityBureauofReference, and this mechanism is the predecessor of the measurement of present EU criteria and mechanism for testing StandardsMeasurementsandTestingProgramme) of heavy metal.Heavy metal can be divided into acid-soluble state, reducible state, oxidable state, residual form by BCR method in mud.Wherein, acid-soluble state, reducible state are unstable form, and oxidable state, residual form are stable state.
Choose the copper in heavy metal and zinc below, in conjunction with specific examples, the invention will be further described, but this concrete example just how technical solution of the present invention implemented and make, protection scope of the present invention is not only confined to this.
In following embodiment, municipal sludge used is the mud of sewage work of Xiangyang City of Hubei Province evaporation plant, its pH is 8.3 ~ 8.6, solid content (TS) is 14.67% ~ 16.04%, organic is 55.4% ~ 63.4% with the ratio (VS/TS) of solid content, all by percentage to the quality.Wherein the content of copper and zinc and fractions distribution as shown in table 1.
Table 1
In following embodiment, hydrolysis acidification pool is the hydrolysis acidification pool that process debugging is good 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 strain inoculation rate is 45%.
The COD/SO of mud mixture in sulphate 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 makes COD/SO as carbon source adjustment in the present invention
4 2-be greater than 3.0.But when adopting different mud, without the need to adding formic acid, namely COD/SO may can be made
4 2-be greater than 3.0.
Embodiment 1
The method realizing heavy metals in city sewage sludge stabilization that biochemical-physical combines, comprises the steps:
(1) acidication: first above-mentioned municipal sludge is entered hydrolysis acidification pool, keep temperature 30 DEG C, pH in hydrolysis acidification pool is adjusted to be 6 with 50% sulfuric acid, 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: by the municipal sludge processed through above-mentioned steps (1) by hydrolysis acidification pool mud run by gravity through sulphate reducing bacteria be strain inoculation tame after anaerobic pond, the temperature of described anaerobic pond remains on 35 DEG C, redox potential (Eh) is-120mV, regulate pH at 7-8 with lime, input formic acid regulates the COD/SO of 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 processed through above-mentioned steps (2) is entered counteracting tank by anaerobic pond and carries out thermal hydrolysis, counteracting tank temperature remains on 170 DEG C, 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 realizing heavy metal stabilization prepared by the present embodiment air-dry, after milled 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 adds 16.77% compared to primary sludge, and wherein acid-soluble state does not detect, reducible state decreases 24.24%, oxidable state adds 29.95%, and residual form adds 49.22%, and stable form adds 13.43%; The total content of zinc adds 2.91% compared to primary sludge, and wherein acid-soluble state decreases 29.73%, and reducible state decreases 26.74%, and oxidable state adds 29.22%, and residual form adds 91.12%, and stable form adds 21.48%.
Table 2
Embodiment 2
The method realizing heavy metals in city sewage sludge stabilization that biochemical-physical combines, comprises the steps:
(1) acidication: (1) acidication: first above-mentioned municipal sludge is entered hydrolysis acidification pool, keep temperature 35 DEG C, pH in hydrolysis acidification pool is adjusted to be 6 with 50% sulfuric acid, 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: by the municipal sludge processed through above-mentioned steps (1) by hydrolysis acidification pool mud run by gravity enter through sulphate reducing bacteria be strain inoculation tame after anaerobic pond, the temperature of described anaerobic pond remains on 30 DEG C, redox potential (Eh) is-125mV, regulate pH at 7-8 with lime, input formic acid regulates the COD/SO of 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 processed through above-mentioned steps (2) is entered counteracting tank by anaerobic pond and carries out thermal hydrolysis, counteracting tank temperature remains on 170 DEG C, 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 realizing heavy metal stabilization prepared by the present embodiment air-dry, after milled 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 adds 12.99% compared to primary sludge, and wherein acid-soluble state does not detect, reducible state decreases 19.48%, oxidable state adds 13.84%, and residual form adds 50.43%, and stable form adds 11.67%; The total content of zinc adds 3.98% compared to primary sludge, and wherein acid-soluble state decreases 30.80%, and reducible state decreases 19.54%, and oxidable state adds 22.22%, and residual form adds 79.26%, and stable form adds 18.04%.
Table 3
Embodiment 3
The method realizing heavy metals in city sewage sludge stabilization that biochemical-physical combines, comprises the steps:
(1) acidication: first above-mentioned municipal sludge is entered hydrolysis acidification pool, keep temperature 25 DEG C, pH in hydrolysis acidification pool is adjusted to be 6 with 50% sulfuric acid, 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: by the municipal sludge processed through above-mentioned steps (1) by hydrolysis acidification pool mud run by gravity enter through sulphate reducing bacteria be strain inoculation tame after anaerobic pond, the temperature of described anaerobic pond remains on 25 DEG C, redox potential (Eh) is-110mV, regulate pH at 7-8 with lime, input formic acid regulates the COD/SO of 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 processed through above-mentioned steps (2) is entered counteracting tank by anaerobic pond and carries out thermal hydrolysis, counteracting tank temperature remains on 110 DEG C, 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 realizing heavy metal stabilization prepared by the present embodiment air-dry, after milled 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 adds 6.23% compared to primary sludge, and wherein acid-soluble state does not detect, reducible state decreases 9.52%, oxidable state adds 10.51%, and residual form adds 26.09%, and stable form adds 7.82%; The total content of zinc adds 2.47% compared to primary sludge, and wherein acid-soluble state decreases 13.54%, and reducible state decreases 15.00%, and oxidable state adds 12.76%, and residual form adds 53.17%, and stable form adds 12.27%.
Table 4
Embodiment 4
The method realizing heavy metals in city sewage sludge stabilization that biochemical-physical combines, comprises the steps:
(1) acidication: first above-mentioned municipal sludge is entered hydrolysis acidification pool, keep temperature 20 DEG C, pH in hydrolysis acidification pool is adjusted to be 6 with 50% sulfuric acid, 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 processed through above-mentioned steps (1) is entered counteracting tank by anaerobic pond and carries out thermal hydrolysis, counteracting tank temperature remains on 110 DEG C, 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 realizing heavy metal stabilization prepared by the present embodiment air-dry, after milled 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 adds 5.33% compared to primary sludge, and wherein acid-soluble state does not detect, reducible state decreases 6.06%, oxidable state adds 4.20%, and residual form adds 26.96%, and stable form adds 6.71%; The total content of zinc adds 0.95% compared to primary sludge, and wherein acid-soluble state decreases 8.59%, and reducible state decreases 8.03%, and oxidable state adds 2.88%, and residual form adds 20.27%, and stable form adds 5.30%.
Table 5
Embodiment 5
The method realizing heavy metals in city sewage sludge stabilization that biochemical-physical combines, comprises the steps:
(1) sulfate reduction: above-mentioned municipal sludge is entered through sulphate reducing bacteria be strain inoculation domestication after anaerobic pond, the temperature of described anaerobic pond remains on 25 DEG C, redox potential (Eh) is-110mV, pH remains on 7-8, and input formic acid regulates the COD/SO of 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 processed through above-mentioned steps (1) is entered counteracting tank by anaerobic pond and carries out thermal hydrolysis, counteracting tank temperature remains on 110 DEG C, 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 realizing heavy metal stabilization prepared by the present embodiment air-dry, after milled 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 adds 3.65% compared to primary sludge, and wherein acid-soluble state does not detect, reducible state decreases 3.25%, oxidable state adds 7.88%, and residual form adds 16.17%, and stable form adds 5.56%; The total content of zinc adds 4.72% compared to primary sludge, and wherein acid-soluble state decreases 15.36%, and reducible state decreases 6.35%, and oxidable state adds 8.23%, and residual form adds 25.31%, and stable form adds 6.20%.
Table 6
Although in order to the object of illustrating and describe, and describe above-described embodiment of the preferred embodiment for the present invention.But these embodiments are not detailed descriptions, can not by limit of the present invention in this.For a person skilled in the art, numerous modifications and variations can be made 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 scope and spirit of the present invention as defined by the appended claims.
Claims (3)
1. the method realizing heavy metals in city sewage sludge stabilization of biochemical-physical combination, is characterized in that comprising the steps:
(1) acidication: first municipal sludge enters hydrolysis acidification pool, carries out initial hydrolysis acidifying;
(2) thermal hydrolysis: the municipal sludge processed through above-mentioned steps (1) is entered counteracting tank by hydrolysis acidification pool and carries out thermal hydrolysis, then enters flash tank and is down to room temperature normal pressure, be i.e. the municipal sludge of accomplished heavy metal stabilization;
In described hydrolysis acidification pool, city sludge concentration remains on 10 ~ 20g/L, upflow velocity 0.8 ~ 1.8m/h in pond, and stirring velocity is 80 ~ 100r/min, and regulate pH to be 5 ~ 7, temperature remains on 20 ~ 35 DEG C, and the municipal sludge residence time is 2.5 ~ 4.5h; In described counteracting tank, temperature remains on 110 ~ 170 DEG C, and pressure remains on 140kPa ~ 790kPa, and the municipal sludge residence time remains on 15 ~ 30min.
2. the method realizing heavy metals in city sewage sludge stabilization of biochemical-physical combination, is characterized in that comprising the steps:
(1) sulfate reduction: municipal sludge first enter through sulphate reducing bacteria be strain inoculation domestication after anaerobic pond, the sulfate reduction in described municipal sludge is become hydrogen sulfide;
(2) thermal hydrolysis: the municipal sludge processed through above-mentioned steps (1) is entered counteracting tank by anaerobic pond and carries out thermal hydrolysis, then enters flash tank and is down to room temperature normal pressure, be i.e. the municipal sludge of accomplished heavy metal stabilization;
The temperature of described anaerobic pond remains on 20 ~ 40 DEG C, and redox potential remains on 7 ~ 8, COD/SO lower than-100mV, pH
4 2-guarantee is greater than 3.0, the municipal sludge residence time 10 ~ 15h; In described counteracting tank, temperature remains on 110 ~ 170 DEG C, and pressure remains on 140kPa ~ 790kPa, and the municipal sludge residence time remains on 15 ~ 30min.
3. the method realizing heavy metals in city sewage sludge stabilization of biochemical-physical combination, is characterized in that comprising the steps:
(1) acidication: first municipal sludge enters hydrolysis acidification pool, carries out initial hydrolysis acidifying;
(2) sulfate reduction: by the municipal sludge processed through above-mentioned steps (1) by hydrolysis acidification pool mud run by gravity enter through sulphate reducing bacteria be strain inoculation tame after anaerobic pond, the sulfate reduction in described municipal sludge is become hydrogen sulfide;
(3) thermal hydrolysis: the municipal sludge processed through above-mentioned steps (2) is entered counteracting tank by anaerobic pond and carries out thermal hydrolysis, then enters flash tank and is down to room temperature normal pressure, be i.e. the municipal sludge of accomplished heavy metal stabilization;
In described hydrolysis acidification pool, city sludge concentration remains on 10 ~ 20g/L, upflow velocity 0.8 ~ 1.8m/h in pond, and stirring velocity is 80 ~ 100r/min, and regulate pH to be 5 ~ 7, temperature remains on 20 ~ 35 DEG C, and the municipal sludge residence time is 2.5 ~ 4.5h; The temperature of described anaerobic pond remains on 20 ~ 40 DEG C, and redox potential remains on 7 ~ 8, COD/SO lower than-100mV, pH
4 2-guarantee is greater than 3.0, the municipal sludge residence time 10 ~ 15h; In described counteracting tank, temperature remains on 110 ~ 170 DEG C, and pressure remains on 140kPa ~ 790kPa, and the municipal sludge residence time remains on 15 ~ 30min.
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| CN104649528B (en) * | 2015-01-28 | 2016-04-20 | 徐明好 | A kind of method of Heavy Metals in Sludge process |
| 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 |
| 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 |
| 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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| JP3607252B2 (en) * | 2002-02-20 | 2005-01-05 | 株式会社カワシマ | Sewage treatment method and apparatus |
| CN102826730B (en) * | 2012-09-27 | 2013-11-13 | 青岛理工大学 | Anaerobically digested sludge pyrohydrolysis-ultrasonic combined pretreatment method |
| CN103224315B (en) * | 2013-03-21 | 2014-05-14 | 曹玉成 | Sludge comprehensive treatment and conversion product recycle method |
| CN103553289B (en) * | 2013-10-23 | 2015-01-14 | 同济大学 | Multistage anaerobic digestion strengthened gas production method |
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