CN105036501A - Sludge degradation treatment method - Google Patents
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- CN105036501A CN105036501A CN201510475497.7A CN201510475497A CN105036501A CN 105036501 A CN105036501 A CN 105036501A CN 201510475497 A CN201510475497 A CN 201510475497A CN 105036501 A CN105036501 A CN 105036501A
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Abstract
The invention relates to the field of sludge treatment, in particular to a sludge degradation treatment method. The method can degrade sludge to be combustible gas products, liquid products and solid products, the products are separately treated, and therefore large-scale treatment of the sludge is facilitated, and classified discharging after degradation is facilitated. The defects that in the prior art, sludge is difficult to transport, and large-scale treatment is inconvenient are overcome. According to the embodiment of the sludge degradation treatment method, the method includes the steps that step1, the sludge to be treated is mixed with enriched-oxygen gas, and the mixture is treated under the undercritical conditions; step2, the treated products are separated to obtain the combustible gas products, the liquid products and the solid products.
Description
Technical field
The present invention relates to field of sludge treatment, particularly relate to a kind of sludge degradation treatment process.
Background technology
At present, China's municipal sewage treatment amount increases day by day, and the sludge quantity produced in the annual sewage treatment process of China is more than 3,000 ten thousand tons.Mud is a kind of composition organic relic, microorganism, inorganic particle and colloid etc. and the heterogeneous body of complexity, because mud has the advantages that viscosity is large, water ratio is high (more than 80%), organic content is high and easy corruption is smelly, in the process that mud is processed, exist and not easily carry and discharge limited problem.
Therefore, be badly in need of finding a kind of sludge degradation treatment process, greatly not easily carry to solve sludge quantity and discharge limited problem.
Summary of the invention
Main purpose of the present invention is, provides a kind of sludge degradation treatment process, can be gas, solid and product liquid by sludge degradation, and be processed respectively, thus is convenient to the extensive process of mud and the classified emission after degrading.
For achieving the above object, the present invention adopts following technical scheme:
On the one hand, the embodiment of the present invention provides a kind of sludge degradation treatment process, comprising:
Step 1) pending mud is mixed with oxygen rich gas, process under undercritical conditions;
Step 2) product after process is separated, obtain inflammable gas product, product liquid and solid product.
Preferably, described step 2) in the product after process is carried out separation and is comprised:
Step 21) product after process is obtained flash-off steam and flash distillation substrate by step-down flash separation, described flash-off steam cooling obtains first part's inflammable gas product and first part's product liquid;
Step 22) flash distillation substrate is separated acquisition second section inflammable gas product, second section product liquid and solid product through gas-solid-liquid.
Optionally, described method also comprises: step 3) in obtained product liquid or second section product liquid, add heavy metal stabilizer carry out that heavy metal is fixing to be obtained heavy metal solid product and can discharge use water;
Or, in step 1) and middle interpolation heavy metal stabilizer.
Further, described in step 1) in add heavy metal stabilizer comprise: in pending mud, add heavy metal stabilizer; Or, in sub-critical treatment process, add heavy metal stabilizer.
Preferably, described heavy metal stabilizer comprises alkali metal hydroxide, alkaline earth metal hydroxides or vitriol.
Optionally, under described undercritical conditions, the pressure of system is 3-22MPa, and temperature is 200-373 DEG C.
Preferably, in the addition of described oxygen rich gas, the quality of oxygen is the 3-30% of sludge degradation theoretical oxygen demand.
Optionally, add in the process of heavy metal stabilizer and keep the temperature of system to be 30-350 DEG C, pressure is 1.0-15MPa.
Preferably, after adding described heavy metal stabilizer, in system, the concentration of heavy metal stabilizer is 30mg/L ~ 100g/L.
Further, the addition manner of described heavy metal stabilizer adds for interval or adds continuously.
The embodiment of the present invention provides a kind of sludge degradation treatment process, wherein, described pending mud is usually by organic relic, microorganism, inorganic particle and colloid composition, by adding oxygen rich gas in mud, and process under undercritical conditions, main binding material in mud and biomass cells can be destroyed makes sludge degradation be inflammable gas product, product liquid and solid product, and inflammable gas product, product liquid and solid product can be processed respectively, thus be convenient to the extensive process of mud and the classified emission after degrading, overcome mud in prior art not easily carry and be not easy to the defect of extensive process.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, below the accompanying drawing used required in describing embodiment is briefly described, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
The schema of a kind of sludge degradation treatment process that Fig. 1 provides for the embodiment of the present invention;
The schema of the another kind of sludge degradation treatment process that Fig. 2 provides for the embodiment of the present invention;
The schema of the another kind of sludge degradation treatment process that Fig. 3 provides for the embodiment of the present invention;
The schema of the another kind of sludge degradation treatment process that Fig. 4 provides for the embodiment of the present invention;
The schema of the another kind of sludge degradation treatment process that Fig. 5 provides for the embodiment of the present invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
In describing the invention, it will be appreciated that, orientation or the position relationship of the instruction such as term " " center ", " on ", D score, "front", "rear", "left", "right", " vertically ", " level ", " top ", " end ", " interior ", " outward " they be based on orientation shown in the drawings or position relationship; be only the present invention for convenience of description and simplified characterization; instead of instruction or imply the device of indication or element must have specific orientation, with specific azimuth configuration and operation, therefore can not be interpreted as limitation of the present invention.In describing the invention, except as otherwise noted, the implication of " multiple " is two or more.
See Fig. 1, for the embodiment of the present invention provides a kind of schema of sludge degradation treatment process, comprising:
Step 1) pending mud is mixed with oxygen rich gas, process under undercritical conditions;
Step 2) product after process is separated, obtain inflammable gas product, product liquid and solid product.
The embodiment of the present invention provides a kind of sludge degradation treatment process, wherein, described pending mud is usually by organic relic, microorganism, inorganic particle and colloid composition, by adding oxygen rich gas in mud, and process under undercritical conditions, main binding material in mud and biomass cells can be destroyed makes sludge degradation be inflammable gas product, product liquid and solid product, and inflammable gas product, product liquid and solid product can be processed respectively, thus be convenient to the extensive process of mud and the classified emission after degrading, overcome mud in prior art not easily carry and be not easy to the defect of extensive process.
Wherein, it should be noted that, usually pending sewage sludge viscosity is larger, the uneven problem of mixing is there is when being mixed with oxygen rich gas by pending mud, simultaneously, effort is compared when being transported in retort by pending mud, therefore, carry out step 1) before degradation treatment, first pre-treatment can be carried out to described pending mud, make pumpable mud slurry, preferably, in step 1) also comprise before: in pending mud, add water mud is diluted to preset concentration.At this, described preset concentration is not limited, as long as make mud to realize pumping.
Wherein, do not limit described undercritical conditions, in one embodiment of the invention, under described undercritical conditions, system pressure is 3-22MPa, and temperature is 200-373 DEG C.Preferably, system pressure is 5-18MPa.
Wherein, also do not limit described oxygen rich gas, preferably, described oxygen rich gas is the oxygen that concentration is greater than 99%.After described pending mud and concentration are greater than the oxygen mix of 99%, under undercritical conditions, make mud generation DeR, other chemical elements can not be introduced in the process, thus simplify subsequent processes.
To step 1) described in the addition of oxygen rich gas also do not limit, it should be noted that, oxygen rich gas and mud make mud generation DeR under undercritical conditions, in the process, organic relic in mud, the organism such as microorganism with excessive oxygen reaction after can become carbonic acid gas and water, and when amount of oxygen is not enough, organic relic in described mud, the organism such as microorganism can be oxidized to inflammable gas product and water, in one embodiment of the invention, in the addition of described oxygen rich gas, the quality of oxygen is the 3-30% of sludge degradation theoretical oxygen demand.Wherein, ultimate analysis can be carried out to a certain amount of mud, and the calorific value of mud is measured, thus draw the carbon content of mud, the amount of oxygen be converted into required for carbonic acid gas of the carbon in mud is described sludge degradation theoretical oxygen demand.
Wherein, to described step 2) in the detailed process that is separated of product after process is not limited, in the preferred embodiment of the present invention, described step 2) in the product after process is carried out separation and is comprised: step 21) product after process is obtained flash-off steam and flash distillation substrate by step-down flash separation, described flash-off steam cooling obtains first part's inflammable gas product and first part's product liquid; Step 22) flash distillation substrate is separated acquisition second section inflammable gas product, second section product liquid and solid product through gas-solid-liquid.
Wherein, step-down flash distillation refer to when the heat setting under certain pressure bear water or feedwater by step-down, the process of part water generation double evaporation-cooling, the steam obtained is flash-off steam.By above-mentioned sepn process, the first part's product liquid obtained is cleaning water, irrigation or domestic water can be directly used in, improve the utilising efficiency of water resources, simultaneously, described second section product liquid can also be reduced, thus the subsequent disposal scale to described second section product liquid can be reduced.
Wherein, to through step 2) the inflammable gas product that obtains, the processing mode of product liquid or second section product liquid and solid product does not also limit, wherein, described inflammable gas product may be used for industrial energy supply or as fuel combustion, described product liquid or second section product liquid can test by ultimate analysis etc. the heavy metal content determined wherein, what reach emission standard may be used for irrigation, mud slurrying or directly discharge, what do not reach emission standard gives process further to carry out discharging or mud slurrying, described solid product can carry out burning disposal after centralized collection, Anaerobic Digestion or landfill disposal.
Wherein, it should be noted that, in different industries, produce the composition also difference to some extent of mud, such as, industrial sludge is for municipal sludge, the composition of industrial sludge is more complicated, mercury, cadmium, the heavy metal contaminants content such as chromium are higher, the product liquid that the mud reduced at some heavy metal content obtains through above-mentioned degradation process can directly discharge, but, in industrial sludge, heavy metal content is higher, when processing industrial sludge, heavy metal content is one of unmanageable reason of waste, and after industrial sludge is by above-mentioned degradation treatment process, these heavy metal contaminants are present in obtained product liquid or second section product liquid with the form of ion usually, the product liquid obtained or second section product liquid due to heavy metal content too high and do not reach emission standard, carry out after needing to process further discharging or for mud slurrying.
In a preferred embodiment of the present invention, described method also comprises:
Step 3) add heavy metal stabilizer in the product liquid that obtains or second section product liquid and carry out that heavy metal is fixing to be obtained heavy metal solid product and can discharge use water;
By adding heavy metal stabilizer in obtained product liquid or second section product liquid, heavy metal ion is precipitated in solid form, thus realize the separation of heavy metal contaminants, acquisition can discharge use water and heavy metal solid product.
Or, in step 1) middle interpolation heavy metal stabilizer, like this, in whole sub-critical treatment process, namely there is heavy metal fix, thus in step 2) carry out being separated to the product after process after the product liquid that obtains be and can discharge use water, include heavy metal solid product in solid product.Simultaneously, heavy metal contaminants in described mud and heavy metal stabilizer carry out heavy metal and stablize under undercritical conditions, chemical equilibrium in heavy metal ion reaction process under high-temperature and high-pressure conditions in heavy metal stabilizer and mud is moved to the direction producing stable heavy metal solid product, relative in step 3) add heavy metal stabilizer in the product liquid that obtains or second section product liquid, total reaction process can be accelerated, shorten reaction time.
Wherein, it should be noted that, the discharged use water obtained by interpolation heavy metal stabilizer, when for mud slurrying, owing to wherein may contain the heavy metal stabilizer do not reacted, can carry out recycling to heavy metal stabilizer wherein.
It should be noted that, to step 3) temperature and pressure that adds the system that heavy metal stabilizer carries out when heavy metal is fixed in obtained product liquid or second section product liquid do not limit, preferably, in step 3) in add in heavy metal stabilizer process and keep the temperature of system to be 30-350 DEG C, pressure is 1.0-15MPa.With this understanding, the chemical equilibrium in the heavy metal ion reaction process in heavy metal stabilizer and mud is moved to the direction producing stable heavy metal solid product, can reduce the reaction times that heavy metal is fixing, shortens reaction time.
Wherein, to described in step 1) in add the concrete operations of heavy metal stabilizer and do not limit, in the embodiment of the present invention, described in step 1) in add heavy metal stabilizer and comprise: in pending mud, add heavy metal stabilizer; Or, in sub-critical treatment process, add heavy metal stabilizer.
Wherein, described heavy metal stabilizer is not limited, as long as exist with the form of heavy metal solid product after making the heavy metal ion in mud react with described heavy metal stabilizer and can realize being separated.Preferably, described heavy metal stabilizer comprises alkali metal hydroxide, alkaline earth metal hydroxides or vitriol.
Wherein, the form of described heavy metal stabilizer is not limited, described heavy metal stabilizer can be solid, also can be the aqueous solution, when heavy metal stabilizer is aqueous solution form, be added into described step 1) in can increase the contact area of described heavy metal stabilizer and described mud, improve speed of reaction, simultaneously, when heavy metal stabilizer is that aqueous solution form is added into described step 1) in pending mud in time, can dilute mud, thus tough mud can be transported by the form of pumping, thus be conducive to subsequent processes.
Also do not limit the addition of described heavy metal stabilizer, preferably, after adding described heavy metal stabilizer, in system, the concentration of heavy metal stabilizer is 30mg/L ~ 100g/L.
Also do not limit the addition manner of described heavy metal stabilizer, preferably, the addition manner of described heavy metal stabilizer can add for interval or add continuously.
Embodiment
Below, the embodiment of the present invention arranges embodiment the present invention will be described.These embodiments are only the examples proposed to illustrate the present invention, and those skilled in the art are not it is appreciated that scope of the present invention is by the restriction of these embodiments.
Wherein, it should be noted that, in the examples below for pending mud for industrial sludge is described, in industrial sludge, heavy metal content is usually higher, therefore, obtained product liquid carry out discharging or for mud slurrying before, all need to add heavy metal stabilizer and carry out heavy metal and fix.
Embodiment 1
The embodiment of the present invention 1 provides a kind of sludge degradation treatment process, shown in Figure 2:
Step 1) pending mud is mixed with oxygen rich gas, process under undercritical conditions;
Be specially: mud is prepared into through pre-treatment can the mud slurry of pumping, add oxygen rich gas in mud slurry, wherein, in the addition of oxygen rich gas, the quality of oxygen is 3% of mud theoretical oxygen demand, (22MPa, 373 DEG C) process under undercritical conditions.
Step 2) product after process is separated, obtain inflammable gas product, product liquid and solid product;
Be specially: be separated through a step and obtain inflammable gas product, solid product (moisture 20%) and product liquid, wherein, described inflammable gas product can directly burn, and in described product liquid, heavy metal content is higher, can not be used for direct discharge.
Step 3) in described product liquid, add metabisulfite solution, be separated acquisition and can discharge use water and heavy metal solid product.
Concrete, in the process, system is 1.0MPa, and temperature is 30 DEG C, and in system, the concentration of sulfate radical is 30mg/L, is separated acquisition and can discharges use water and heavy metal solid product.
The discharged use water obtained is recyclable for mud slurrying, also can directly discharge, described heavy metals immobilization product and step 2) solid product that obtains is unified collect after carry out burning disposal.
Embodiment 2
The embodiment of the present invention 2 provides a kind of sludge degradation treatment process, shown in Figure 3:
Step 1) in pending mud, add heavy metal stabilizer, and mix with oxygen rich gas, process under undercritical conditions;
Be specially: in pending mud, add calcium hydroxide solid, by stirring dissolution of solid, be prepared into mud slurry, in mud slurry, the concentration of calcium hydroxide is 100g/L, described mud slurry is mixed with oxygen rich gas after pressurization preheating, wherein, in the addition of oxygen rich gas, the quality of oxygen is 30% of mud raw material chemical oxygen demand (COD), (9MPa, 280 DEG C) process under undercritical conditions.
Step 2) product after process is separated, obtain inflammable gas product, product liquid and solid product;
Be specially: be separated through a step and obtain inflammable gas product, solid product (moisture 20%) and product liquid, wherein, described inflammable gas product is used for boiler combustion, solid product can concentrate landfill or fermentative processing, and product liquid can be used for reclaiming slurrying or directly discharging.
Embodiment 3
The embodiment of the present invention 3 provides a kind of sludge degradation treatment process, shown in Figure 4:
Step 1) pending mud and water are mixed with into mud slurry, process under mud slurry and oxygen rich gas are blended in undercritical conditions;
Detailed process is substantially identical with described embodiment 1, unlike: undercritical conditions is pressure 3MPa, and temperature is 200 DEG C.
Step 2) mud after process is separated, obtain inflammable gas product, solid product and product liquid;
Be specially:
Step 21) mud after process is carried out step-down flash distillation acquisition flash-off steam and flash distillation substrate, obtain first part's product liquid (cleaning water) and first part's inflammable gas after flash-off steam cooling; Wherein, cleaning water can directly discharge or separately do he with or for mud slurrying, first part's inflammable gas product can be used as fuel combustion.
Step 22) flash distillation substrate is obtained second section product liquid, solid product and second section inflammable gas product after secondary separation; Wherein, second section product liquid is the liquid containing heavy metal ion, and solid product can directly landfill or burning disposal, and second section inflammable gas product can be used as fuel combustion.
Step 3) in step 22) add heavy metal stabilizer in the second section product liquid that obtains, acquisition can discharge use water and heavy metal solid product.
Be specially: in step 22) add sodium hydroxide solution in the second section product liquid that obtains, keep system pressure to be 15MPa in the process, temperature is 350 DEG C, makes the concentration of sodium hydroxide in system be 50mg/L.Wherein, the discharged use water obtained can directly discharge or for mud slurrying, the heavy metal solid product obtained can burn or landfill disposal.
Embodiment 4
The embodiment of the present invention 4 provides a kind of sludge degradation treatment process, shown in Figure 5:
Step 1) pending mud is mixed with oxygen rich gas, process under undercritical conditions and add heavy metal stabilizer;
Be specially: pending mud is mixed with oxygen rich gas, delivers to reactor by high-pressure pump, react under undercritical conditions, wherein, undercritical conditions is identical with described embodiment 2, and adds Adlerika wherein, makes the concentration of sulfate radical in system be 100mg/L.
Step 2) mud after process is separated, obtain inflammable gas product, product liquid and solid product;
Be specially:
Step 21) mud after process is carried out step-down flash distillation acquisition flash-off steam and flash distillation substrate, obtain first part's product liquid (cleaning water) and first part's inflammable gas product after flash-off steam cooling; Wherein, cleaning water can directly discharge or separately do he with or for mud slurrying, first part's inflammable gas product can be used as fuel combustion.
Step 22) flash distillation substrate obtained after secondary separation and can discharge use water, solid product and second section inflammable gas product.Wherein, can discharge use water can directly carry out discharging or can be used for mud slurrying, and solid product can directly landfill or burning disposal, and second section inflammable gas product can be used as fuel combustion.
In summary, by adding oxygen rich gas in mud, and process under undercritical conditions, can be inflammable gas product by sludge degradation, product liquid and the less solid product of water content, and inflammable gas product, product liquid and solid product may be used for recycling or be convenient to process discharge, thus the extensive treating processes of mud can be simplified, simultaneously, pass through in the embodiment of the present invention to add heavy metal stabilizer in the product liquid obtained to separation, or in system, add heavy metal stabilizer in initial reaction stage, the heavy metal content in mud can also be reduced, to reduce the pollution that heavy metals emission causes, overcome mud in prior art not easily carry and be not easy to the defect of extensive process.
The above; be only the specific embodiment of the present invention, but protection scope of the present invention is not limited thereto, is anyly familiar with those skilled in the art in the technical scope that the present invention discloses; change can be expected easily or replace, all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection domain of described claim.
Claims (10)
1. a sludge degradation treatment process, is characterized in that, comprising:
Step 1) pending mud is mixed with oxygen rich gas, process under undercritical conditions;
Step 2) product after process is separated, obtain inflammable gas product, product liquid and solid product.
2. method according to claim 1, is characterized in that, described step 2) in the product after process is carried out separation and is comprised:
Step 21) product after process is obtained flash-off steam and flash distillation substrate by step-down flash separation, described flash-off steam cooling obtains first part's inflammable gas product and first part's product liquid;
Step 22) flash distillation substrate is separated acquisition second section inflammable gas product, second section product liquid and solid product through gas-solid-liquid.
3. method according to claim 1 and 2, is characterized in that, described method also comprises:
Step 3) in obtained product liquid or second section product liquid, add heavy metal stabilizer carry out that heavy metal is fixing to be obtained heavy metal solid product and can discharge use water;
Or, in step 1) and middle interpolation heavy metal stabilizer.
4. method according to claim 3, is characterized in that, described in step 1) in add heavy metal stabilizer comprise: in pending mud, add heavy metal stabilizer; Or, in sub-critical treatment process, add heavy metal stabilizer.
5. method according to claim 3, is characterized in that, described heavy metal stabilizer comprises alkali metal hydroxide, alkaline earth metal hydroxides or vitriol.
6. method according to claim 1, is characterized in that, under described undercritical conditions, the pressure of system is 3-22MPa, and temperature is 200-373 DEG C.
7. method according to claim 1, is characterized in that, in the addition of described oxygen rich gas, the quality of oxygen is the 3-30% of sludge degradation theoretical oxygen demand.
8. method according to claim 3, is characterized in that, in step 3) in add heavy metal stabilizer process in keep the temperature of system to be 30-350 DEG C, pressure is 1.0-15MPa.
9. method according to claim 3, is characterized in that, after adding described heavy metal stabilizer, in system, the concentration of heavy metal stabilizer is 30mg/L ~ 100g/L.
10. method according to claim 3, is characterized in that, the addition manner of described heavy metal stabilizer adds for interval or adds continuously.
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| JP2001524871A (en) * | 1997-04-24 | 2001-12-04 | ハイドロプロセシング・リミテッド・ライアビリティ・カンパニー | Apparatus and method for oxidizing indigestible sewage sludge |
| CN101066828A (en) * | 2007-06-12 | 2007-11-07 | 大庆石油学院 | Technological process of treating oil-containing sludge with supercritical water oxidation |
| US20080283472A1 (en) * | 2007-05-16 | 2008-11-20 | Scott John A | Supercritical water oxidation apparatus and process |
| CN102557366A (en) * | 2012-01-09 | 2012-07-11 | 新奥科技发展有限公司 | Sludge treatment method and application thereof |
| CN104326637A (en) * | 2014-10-21 | 2015-02-04 | 新奥科技发展有限公司 | Sludge treatment method |
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2015
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001524871A (en) * | 1997-04-24 | 2001-12-04 | ハイドロプロセシング・リミテッド・ライアビリティ・カンパニー | Apparatus and method for oxidizing indigestible sewage sludge |
| US20080283472A1 (en) * | 2007-05-16 | 2008-11-20 | Scott John A | Supercritical water oxidation apparatus and process |
| CN101066828A (en) * | 2007-06-12 | 2007-11-07 | 大庆石油学院 | Technological process of treating oil-containing sludge with supercritical water oxidation |
| CN102557366A (en) * | 2012-01-09 | 2012-07-11 | 新奥科技发展有限公司 | Sludge treatment method and application thereof |
| CN104326637A (en) * | 2014-10-21 | 2015-02-04 | 新奥科技发展有限公司 | Sludge treatment method |
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