CN109848188A - A kind of method of kitchen garbage lactic fermentation liquid pretreatment domestic garbage incineration flyash - Google Patents
A kind of method of kitchen garbage lactic fermentation liquid pretreatment domestic garbage incineration flyash Download PDFInfo
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- CN109848188A CN109848188A CN201910244907.5A CN201910244907A CN109848188A CN 109848188 A CN109848188 A CN 109848188A CN 201910244907 A CN201910244907 A CN 201910244907A CN 109848188 A CN109848188 A CN 109848188A
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- kitchen garbage
- fermentation liquid
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- heavy metal
- flying dust
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Abstract
The present invention relates to a kind of methods using chlorine and heavy metal in kitchen garbage fermentation liquid removing flying ash, belong to Solid Waste Treatment and disposal field.This method is at normal temperatures and pressures, to utilize villaumite soluble in kitchen garbage fermentation liquid Bioleaching flying dust, a large amount of insolubility villaumites and part heavy metal.The present invention has not only saved the water consumption in flying dust dechlorination process compared with existing flying dust dechlorination technology, while having dissolved part kitchen garbage, the purpose of the treatment of wastes with processes of wastes against one another reached.In addition, achieved the purpose that by the flying dust after kitchen garbage fermentation liquid leaching process it is innoxious, can further resource utilization.
Description
Technical field
The present invention is a kind of detoxification innoxious process for treating of hazardous waste, belongs to Solid Waste Treatment and disposal field.
Background technique
Consideration of MSW Incineration Technology obtained in China in recent years since its minimizing, stabilisation and recycling are with the obvious advantage
It is widely popularized, the hot spot of research is increasingly becoming to the processing and disposition of burning the waste flying dust generated.But house refuse is burnt
The dioxin-like chemical for burning the low boiling points heavy metal and carcinogenicity such as Pb, Cd, Hg of enriched in flying dust, is issued in State Ministry of Environmental Protection
In " the Hazardous Wastes Management prevention and treatment policy " of cloth, be classified as " it should not be managed and be handled with the universal method of hazardous waste,
And the hazardous waste that need to pay special attention to ".It deals with improperly and extremely serious harm is caused to human health and natural ecological environment.Mesh
Before, the processing means of China's flying dust generally use security landfill after cement solidification.However since cement solidification increase-volume amount is big, occupy
A large amount of land resource, and heavy metal stabilizing is poor, increases the risk of landfill yard.Increase year by year effectively to solve flying dust yield
Sum it up the contradiction of available hazardous waste landfill reduction year by year, the resource utilization of flying dust become most effective approach it
One.
The main component of domestic garbage incineration flyash and flyash etc. are close, belong to CaO-SiO2-Al2O3-Fe2O3System,
Can be used as the alternative materials of manufacture of cement, flying dust after cement kiln high-temperature is calcined, not only can effective fixed part heavy metal, destroy
Dioxin, while effectively reducing cement raw material (lime stone, the natural resources such as clay) usage amount.However, higher chlorine in flying dust
Content is to restrict its bottleneck for directly preparing portland cement.Excessively high chlorinity does not only result in weight during burning clinker of cement
The problems such as a large amount of volatilizations of metal make the reduction of heavy metal fixed rate, can also cause high temperature corrosion, skinning and the blocking of kiln, seriously
When will cause situations such as shutdown or decomposition furnace system explode.Therefore, dechlorination processing need to be carried out when producing cement using flying dust.
Currently, washing is domestic and international most common dechlorination method, washes and can remove a large amount of soluble chlorine in flying dust.But by
The presence of insolubility chlorine in flying dust, even so that flying dust after multi-stage water wash, chlorine residual quantity still in 1%-4%,
Flying dust additive amount is caused to enter the 0.5-2.1% of kiln material quality no more than cement kiln, the current cement excess capacity the case where
Under, the flying dust that yield cannot be made big realizes processing consumption truly.Other than washing, pickling is industrially also used
Method remove the chlorine in flying dust.Pickling has a relatively good effect to the removing of chlorine in flying dust, but currently used pickling
Generally sulfuric acid, the method that the strong acid such as nitric acid leach, although this method can reach dechlorination effect, the waste liquid after leaching is not
It preferably disposes, and needs additional a large amount of acid solution using strong acid dechlorination, cost is also relatively high in practical application, seriously affects flying dust
Industrial applications.
The purpose of the present invention is a large amount of insolubility in flying dust are removed by way of kitchen garbage fermentation liquid Bioleaching
Chlorine and part heavy metal, while the water consumption in treatment process is saved, it can effectively realize the safe handling disposition and resource of flying dust
Change the problem of utilizing.With important practical application value.
Summary of the invention
Chlorine and heavy metal in kitchen garbage fermentation liquid removing flying ash are utilized the purpose of the present invention is to provide a kind of
Method.
In order to achieve the above objectives, present invention employs the following technical solutions:
By after drying flying dust and kitchen garbage fermentation liquid in lixivium ratio be 1:1-1:20 (g/mL) ratio be uniformly mixed,
It is 25-55 DEG C in temperature, under conditions of revolving speed is 120-200rpm, is centrifugated, is taken off after constant temperature oscillation 30-180min
Chlorine removes the flying dust after removing heavy metals.
Further, the kitchen garbage refers to the diet residue in restaurant, restaurant, unit dining room etc..
Further, the flying dust is the trapping object of flue gas purification system in burning city domestic garbage disposal process.
Further, the flue gas generated when the flying dust is using mechanical kiln grate furnace burning domestic garbage, by Ca
(OH)2Resulting flying dust is collected by sack cleaner after processing.
Further, the moisture content of the kitchen garbage is 60%-90%, and the content of organic matter is 90%-97% (dry weight),
PH value is 4.7-6.5.
Further, the kitchen garbage fermentation liquid include: lactic fermentation liquid, acetic fermentation liquid single fermentation liquid or
The anaerobic hydrolysate of mixed fermentation liquid or kitchen garbage.
Further, it is that kitchen garbage is (wet that the preparing condition of the kitchen garbage fermentation liquid, which includes: anaerobic fermentation substrate,
Again) with the mixture of water mixed by 1:0-1:2, it is dung intestines ball that kitchen garbage lactic fermentation system starts strain used for the first time
Bacterium, inoculum concentration are 2%-15% (w/w), and anaerobic fermentation number of days is 1-7 days, and fermentation temperature is 30-40 DEG C.
Further, the kitchen garbage lactic fermentation liquid concentration is 10-60g/L.
Further, the kitchen garbage acetic fermentation liquid concentration is 10-30g/L.
Further, the leaching method can be a batch-type and leach, and is also possible to multiple batch-type and leaches, leaching
When outdegree is 2-5 time, what the 2-5 times leachate can be used as the leaching of another batch flying dust uses water for the first time.
The present invention compared with the existing technology has the advantage that
Method of the invention is set to purpose based on the coexistence of kitchen garbage and domestic garbage incineration flyash, utilizes kitchen garbage
Organic acid effect in fermentation liquid removes a large amount of insolubility chlorine in flying dust, while leaching heavy metal, reduces the heavy metal of flying dust
Leaching, flying dust after treatment can both meet cement kiln and enter kiln standard, but also as the raw material of other construction materials, reach
To the purpose of the treatment of wastes with processes of wastes against one another.The organic acid fermentation liquid mentioned in this method may extend to citric acid fermentation broth, propionic fermentation liquid, fourth
Acid fermentation liquid etc., the target product in fermentation liquor concentration caused by these fermentation systems is lower, purify needed for higher cost when,
It is contemplated that with chlorine and heavy metal in these organic acid fermentation liquid removing flying ash, and this technique fermentation system for the first time
Microbial inoculum is added when starting, the fermentation of later batch can realize inoculation fermentation by fermentation liquor backflow.In addition, this technique is opposite
For traditional washing process, in the case where reaching identical dechlorination effect, 80% or so water consumption can be saved.With compared with
High economic benefit, environmental benefit and important practical application value.
Detailed description of the invention
Fig. 1 is to leach process in the embodiment of the present invention 13.
Specific embodiment
A method of using chlorine and heavy metal in kitchen garbage fermentation liquid removing flying ash, specific operating procedure is such as
Under:
The preparation of lactic fermentation liquid:
(1) it actication of culture: is placed what is saved at -70 DEG C immediately after being taken out in refrigerator equipped with enterococcus faecium cryopreservation tube
In 38 DEG C or so of water-bath, until the icing inside cryopreservation tube is all dissolved.Bacterium solution is accessed by 10% inoculative proportion
Into sterilized MRS fluid nutrient medium, activation is completed in constant temperature incubation 24 hours at 150r/min revolving speed, 37 DEG C.
(2) preparation of seed liquor: a certain amount of activated bacterium solution is taken to access newly with the inoculative proportion of 10% (w/w)
In MRS fluid nutrient medium, constant temperature incubation 12 hours at 150r/min revolving speed, 37 DEG C.
(3) lactic fermentation: will be by preliminary sorting, the kitchen garbage (weight in wet base) that blends that treated and water are according to mass ratio
The mixed mixture of the ratio of 1:0-1:2 is fermentation substrate, is inoculated with the enterococcus faecium seed liquor of 2%-15% (w/w),
Centrifuge separation can be obtained the lactic fermentation liquid of kitchen garbage after ferment at constant temperature 1-7 days under the conditions of 30-40 DEG C of temperature.
Reference examples 1
Flying ash after taking 15g dry is placed in the conical flask of 250mL, uses lixivium than for the ratio of 1:10, to cone
It is sealed after the pure water of 150mL is added in shape bottle, is 25 DEG C in temperature, after revolving speed reacts 120min under conditions of being 150rpm, from
Heart separation.Using chlorinity in ion chromatography supernatant, show that pure water under this condition can leach in flying dust 81.5% chlorine.
Embodiment 1
Flying ash after taking 15g dry is placed in the conical flask of 250mL, uses lixivium than for the ratio of 1:10, to cone
The kitchen garbage lactic fermentation liquid (Lactic Acid from Fermentation Broth concentration is 24.1g/L) that 150mL is added in shape bottle seals afterwards, in temperature
It is 25 DEG C, after revolving speed reacts 120min under conditions of being 150rpm, centrifuge separation.Contained using chlorine in ion chromatography supernatant
Amount show that kitchen garbage lactic fermentation liquid under this condition can leach in flying dust 92.9% chlorine.
Embodiment 2-10 is listed in the following table, remaining condition is the same as embodiment 1.
Through the comparisons of embodiment 1 and reference examples 1 it can be found that under identical water consumption, using lactic fermentation liquid pair
Flying ash carries out Bioleaching, and the leaching content of chlorine in flying dust can be greatly improved.Furthermore by pair
Embodiment 1,8,9,10, which is fitted, can be calculated, when reaching identical dechlorination amount, using kitchen garbage lactic acid
Fermentation liquid leaches flying dust can water-saving about 80% or so.
Embodiment 11
Kitchen garbage is used for acetic fermentation, investigates kitchen garbage acetic fermentation liquid to the dechlorination effect of flying ash.
(1) preparation of acetic fermentation liquid:
The activation of strain and seed liquor prepare same lactic fermentation liquid.The step of acetic fermentation are as follows: it will be sorted by preliminary,
The mixed mixture of ratio that blend that treated kitchen garbage (weight in wet base) and water is 1:0-1:2 according to mass ratio is fermentation bottom
Object is placed in fermentor, successively adds the high activity dried yeast of 10% (w/w) and the acetic acid bacteria seed liquor of 10% (w/w),
Centrifuge separation can be obtained the acetic fermentation liquid of kitchen garbage after ferment at constant temperature 1-7 days under 30-40 DEG C of micro-oxygen conditions.
(2) flying ash after taking 15g dry is placed in the conical flask of 250mL, uses lixivium than for the ratio of 1:10,
The kitchen garbage acetic fermentation liquid (acetic acid concentration is 21.7g/L in fermentation liquid) that 150mL is added into conical flask seals afterwards, in temperature
Degree is 25 DEG C, after revolving speed reacts 120min under conditions of being 150rpm, centrifuge separation.Using chlorine in ion chromatography supernatant
Content show that kitchen garbage lactic fermentation liquid under this condition can leach in flying dust 94.4% chlorine.
By the comparison of embodiment 1, embodiment 11 and reference examples 1 it can be found that the organic acid fermentation liquid pair of kitchen garbage
The removal effect of chlorine is better than pure water in flying ash, and kitchen garbage acetic fermentation liquid wants the removal effect of chlorine in flying ash
Better than lactic fermentation liquid.But in the actual production process, acetic fermentation condition is harsh, and the low output of acetic acid, does not utilize reality
The efficient progress of production.
Embodiment 12
This experiment investigates food waste hydrolysis acidifying liquid to the removal effect of chlorine in flying ash.In 30-40 DEG C of temperature
Under the conditions of, it will be by preliminary sorting, the kitchen garbage anaerobic hydrolysis-acidification that blends that treated is centrifugated after 1-7 days can be obtained
The anaerobic hydrolysate of kitchen garbage.
Flying ash after taking 15g dry is placed in the conical flask of 250mL, uses lixivium than for the ratio of 1:10, to cone
The food waste hydrolysis acidifying liquid (VFAs=20.3g/L) that 150mL is added in shape bottle seals afterwards, is 25 DEG C in temperature, revolving speed is
After reacting 120min under conditions of 150rpm, centrifuge separation.Using chlorinity in ion chromatography supernatant, the condition is obtained
Lower kitchen garbage lactic fermentation liquid can leach in flying dust 94.2% chlorine.
Embodiment 13
Flying ash after taking 15g dry is placed in the conical flask of 250mL, is 1:10, total extraction time in total solid-to-liquid ratio
For 120min, by the way of extraction temperature is leached under conditions of being 25 DEG C using three steps, investigation lactic fermentation liquid to chlorine in flying dust and
The removing amount of heavy metal.Leaching step is as shown in Figure 1.
It is as a result as follows using the content of chlorine in each step leachate of ion chromatography:
The removing amount for leaching then chlorine according to 5 steps under this condition is 99.3%.
Reference examples 2
Flying ash after taking 15g dry is placed in the conical flask of 250mL, is 1:10, total extraction time in total solid-to-liquid ratio
For 120min, by the way of extraction temperature is leached under conditions of being 25 DEG C using three steps, investigation pure water is to chlorine in flying dust and heavy metal
Removing amount.Leaching step is the same as embodiment 13.Experimental result is as follows:
Embodiment 1, embodiment 13, reference examples 1, reference examples 2 are compared, all in all, fermentation liquid is to chlorine element
Leaching effect is significantly higher than washing, and substep leaching effect is leached higher than a step.Because being leached for a step, although can guarantee solid-liquid
Than relatively high, but because of itself and the alkali substance reaction in flying dust, cause the pH value in system higher, acidic environment is not strong enough,
Thus exist for the leaching of insolubility chlorine and hinders.By the data of embodiment 13 and reference examples 2 it is found that being leached from second step
Start, the chlorinity in leachate is lower, and therefore, since second step and later leachate can be used as another batch flying dust leaching
Out use water for the first time.
Embodiment 14
Kitchen garbage lactic fermentation liquid is investigated to the effect of heavy metal in flying ash, leaching step is the same as embodiment 1.Experiment
After using atomic absorption spectrophotometer to measurement leachate in seven heavy metal species of Zn, Pb, Cu, Mn, As, Cr, Cd contain
Amount obtains under this condition, kitchen garbage lactic fermentation liquid is 275.9 μ g/g flying dusts to the removing amount of heavy metal in flying ash.
Reference examples 3
Pure water is investigated to the effect of heavy metal in flying ash, leaching step is the same as embodiment 1.Atom is used after experiment
Absorption spectrophotometer obtains under this condition the content of seven heavy metal species of Zn, Pb, Cu, Mn, As, Cr, Cd in measurement leachate
Pure water is 103.5 μ g/g flying dusts to the removing amount of heavy metal in flying ash.
Claims (10)
1. a kind of method using chlorine and heavy metal in kitchen garbage fermentation liquid removing flying ash, it is characterised in that: by following
Step carry out Bioleaching: by after drying flying dust and kitchen garbage fermentation liquid in lixivium ratio be 1:1-1:20 (g/mL) ratio
It is uniformly mixed, is 25-55 DEG C in temperature, under conditions of revolving speed is 120-200rpm, centrifugation point after constant temperature oscillation 30-180min
From acquisition removes the flying dust after chlorine and heavy metal.
2. a kind of side using chlorine and heavy metal in kitchen garbage fermentation liquid removing flying ash according to claim 1
Method, it is characterised in that: the kitchen garbage refers to the diet residue in restaurant, restaurant, unit dining room.
3. a kind of side using chlorine and heavy metal in kitchen garbage fermentation liquid removing flying ash according to claim 1
Method, it is characterised in that: the flying dust is the trapping object of flue gas purification system in burning city domestic garbage disposal process.
4. a kind of side using chlorine and heavy metal in kitchen garbage fermentation liquid removing flying ash according to claim 1
Method, it is characterised in that: the flue gas that the flying dust generates when being using mechanical kiln grate furnace burning domestic garbage, by Ca (OH)2Place
Resulting flying dust is collected by sack cleaner after reason.
5. a kind of side using chlorine and heavy metal in kitchen garbage fermentation liquid removing flying ash according to claim 1
Method, it is characterised in that: the moisture content of the kitchen garbage is 60%-90%, and the content of organic matter is 90%-97% (dry weight), pH
Value is 4.7-6.5.
6. a kind of side using chlorine and heavy metal in kitchen garbage fermentation liquid removing flying ash according to claim 1
Method, it is characterised in that: the kitchen garbage fermentation liquid includes: the single fermentation liquid or mixed of lactic fermentation liquid, acetic fermentation liquid
Close the anaerobic hydrolysate of fermentation liquid or kitchen garbage.
7. a kind of side using chlorine and heavy metal in kitchen garbage fermentation liquid removing flying ash according to claim 1
Method, it is characterised in that: the preparing condition of the kitchen garbage lactic fermentation liquid includes: that anaerobic fermentation substrate is that kitchen garbage is (wet
Weight) with the mixture of water mixed by 1:0-1:2, when kitchen garbage lactic fermentation system start for the first time used in strain be dung intestines ball
Bacterium, inoculum concentration are 2%-15% (w/w), and anaerobic fermentation number of days is 1-7 days, and fermentation temperature is 30-40 DEG C.
8. special according to claim 7 using the method for chlorine and heavy metal in kitchen garbage fermentation liquid removing flying ash
Sign is that obtained kitchen garbage lactic fermentation liquid concentration is 10-60g/L.
9. the method according to claim 6 using chlorine and heavy metal in kitchen garbage fermentation liquid removing flying ash,
The concentration for being characterized in that the kitchen garbage acetic fermentation liquid is 10-30g/L.
10. a kind of side using chlorine and heavy metal in kitchen garbage fermentation liquid removing flying ash according to claim 1
Method, it is characterised in that: the leaching side is that a batch-type leaches or repeatedly batch-type leaches；It is leached using multiple batch-type
When, when to leach number be 2-5 time, what the 2-5 times leachate can be used as the leaching of another batch flying dust uses liquid for the first time.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114789187A (en) * | 2022-04-27 | 2022-07-26 | 江山市虎鼎环保科技有限公司 | Landfill solidified fly ash washing system and method |
| CN114933428A (en) * | 2022-05-31 | 2022-08-23 | 山东大学 | Treatment method and system for treating fly ash by using organic acid |
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| JPH1099814A (en) * | 1996-09-30 | 1998-04-21 | Kanegafuchi Chem Ind Co Ltd | Treatment of waste |
| CN1586743A (en) * | 2004-09-07 | 2005-03-02 | 上海大学 | Treating method for city life garbage burning flyash |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114789187A (en) * | 2022-04-27 | 2022-07-26 | 江山市虎鼎环保科技有限公司 | Landfill solidified fly ash washing system and method |
| CN114933428A (en) * | 2022-05-31 | 2022-08-23 | 山东大学 | Treatment method and system for treating fly ash by using organic acid |
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