CN105237059A - Method for biological detoxification of chromium slag and preparation of biological organic fertilizer - Google Patents
Method for biological detoxification of chromium slag and preparation of biological organic fertilizer Download PDFInfo
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- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
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Abstract
The invention provides a method for biological detoxification of chromium slag and preparation of a biological organic fertilizer. The method comprises the steps: mixing biological solid waste, the chromium slag and an organic conditioner, then carrying out aerobic composting, to obtain the biological organic fertilizer having the hexavalent chromium content reaching standards. The biological solid waste and the organic conditioner are adopted for composting to detoxify the chromium slag, the waste is used for treating the waste, and the method has the characteristics of low investment, low cost, diverse treatment ways, good detoxification effect and the like; and the biological organic fertilizer prepared after composting can realize resource utilization of the chromium slag directly.
Description
Technical field
The invention belongs to clean and the application technology as the second resource field of chromium slag, particularly relate to a kind of chromium slag biologic detoxication and prepare the method for bio-organic fertilizer.
Background technology
Chromium slag is the waste residue containing Cr (VI) that chromium cpd is produced and produced in application process, both comprised and carried out high-temperature roasting (or liquid-phase oxidation) after being mixed by a certain percentage with soda ash (or caustic soda) by chromite in chromium cpd Industrial processes and react, and the residue containing Cr (VI) will obtained after chromic salt leaching separation, comprising again the commercial runs such as iron and steel, coloured, chemical industry, plating, tanning, carrying out processing treatment containing Cr materials and the waste residue containing Cr (VI) that produces because adopting.The Cr (VI) contained in chromium slag, because of its carinogenicity, is listed in one of 8 kinds of maximum chemical substances of harm, is also listed in " National Hazard refuse register " by China containing chromium refuse.If long-term air storage, the Cr (VI) in chromium slag enters surface water or underground water, polluted source and soil through drenching with rain, and causes human carcinogen and affects animal and plant growth.
The technology for the treatment of of chromate slag has a variety of, mainly contains the technology such as dry detoxified, wet method detoxifcation.Wherein, dry detoxified is utilize coal and carbon monoxide at high temperature Cr (VI) to be reduced to Cr (III) or Cr (0), chromium slag sintered ironmaking and under acidic oxide exists high temperature reduction and make cement mineralizing agent and all belong to dry detoxified, but dry method detoxication technique employs other a large amount of raw materials, as iron ore, china clay, clay and Wingdale, chromium slag only accounts for a small amount of composition, and the recycling after dry detoxified also can be subject to a definite limitation; Wet method detoxifcation take the aqueous solution as medium, with reductive agent, the Cr (VI) in chromium slag is reduced to Cr (III) or changes indissoluble thing into, slag volume after wet method detoxifcation and quality significantly increase, containing a large amount of water-soluble salt, be difficult to utilize, need store up separately, and easily be oxidized to Cr (VI) and brightness reversion due to Cr (III), cause removing toxic substances not thorough.
Comparatively speaking, emerging organism and bacterial reduction method likely develop into the effective technology lower to chromium slag original position (on the spot) removing toxic substances disposal costs for administering chromium slag.
CN104338728A discloses a kind of biomass wet method detoxifcation method containing sexavalent chrome waste residue, said method comprising the steps of: the pulp of chromium slag is obtained slurry by (1); (2) pH to 7.0 ~ 10.0 of above-mentioned slurry are regulated; (3) after being heated by slurry, add biomass, stir, carry out pulp process; (4) content of 6-valence Cr ions qualified chromium slag up to standard is obtained after filtering; Regulated the pH value of slurry by acid adding in step (2); Described acid is preferably the mixture of a kind of of nitric acid, hydrochloric acid, sulfuric acid or carbonic acid or at least two kinds; Described biomass are non-living body biomass, and be preferably the mixture of a kind of in stalk, pericarp class or organic waste or at least two kinds, more preferably pericarp biolobic material, most preferably is pomelo peel, Pericarpium Musae or orange peel.But the method needs to add a large amount of acid carrys out adjust ph, and the chromium slag after process can not be utilized effectively.
Summary of the invention
For prior art Problems existing, the object of the present invention is to provide a kind of chromium slag biologic detoxication and prepare the method for bio-organic fertilizer, described method is simple, detoxification chromium slag speed is fast, cost is low, process stabilization, and can the bio-organic fertilizer of production high added value.
For reaching this object, the present invention by the following technical solutions:
" C/N " described in the present invention means the quality of carbon and the mass ratio of nitrogen.
Chromium slag biologic detoxication also prepares the method for bio-organic fertilizer, and described method is: biosolids waste, chromium slag and organic amendment are mixed laggard row aerobic compost, obtains the bio-organic fertilizer that content of 6-valence Cr ions is up to standard.
" content of 6-valence Cr ions is up to standard " in the present invention refers to that chromium slag Leaching detects the limit value lower than [Cr (VI)]≤10mg/L required in " Hazardous wastes judging standard-leaching characteristic identification " (GB5085.3-1996).
Biologic detoxication method for dregs of chrome provided by the invention, compost initial stage biosolids waste is controlled by adding organic amendment, in the mixture of chromium slag and organic amendment, C/N is between 20 ~ 30, guarantee that in composting process, microbiological deterioration and converting organic can carry out smoothly, the interaction of microorganism and biosolids waste produces and comprises hydroxyl, amino, carboxyl, sulfonic group, the functional group of alcoholic extract hydroxyl group or phenolic hydroxyl group etc., these groups are as electron-donating group, not only for sexavalent chrome provides reducing environment, and there is the ability of adsorbing hexavalent chromium ions, both chromic removing toxic substances in chromium slag can have been realized, the bio-organic fertilizer of high-quality can be produced again.
Biologic detoxication method for dregs of chrome provided by the invention, adopt biosolids castoff compost detoxification chromium slag, realize the treatment of wastes with processes of wastes against one another, there is less investment, the feature such as cost is low, processing mode is various and detoxifying effect is good, and the bio-organic fertilizer prepared after compost directly can realize the recycling of chromium slag.
Preferably, be mixed into described in and organic amendment is joined in the mixture of biosolids waste and chromium slag.
Before compost, in the mixture of described biosolids waste, chromium slag and organic amendment, C/N is 20 ~ 30, if C/N is 22,23,24,25,26,28 or 29 etc.
Preferably, the mass ratio of described biosolids waste and chromium slag is 1:(1 ~ 5), as 1:1,1:2,1:3,1:4 or 1:5 etc., be preferably 1:(1 ~ 3).The mass ratio of solid waste and chromium slag exceedes this scope, and the degradation effect of chromium slag is bad.
Preferably, the quality of described organic amendment accounts for 15 ~ 45% of the total mass of biosolids waste and chromium slag, as 16%, 18%, 20%, 22%, 25%, 28%, 30%, 32%, 35%, 38%, 40% or 42% etc., is preferably 25 ~ 45%.If the quality of organic amendment is too low, nitrogen excessive in biosolids waste can be converted into ammonia and lose, and causes nitrogen nutrition to lose in a large number; If the quality of organic amendment is too high, in composting process, can be too much for the carbon consumed, nitrogen element nutriment lacks relatively, and bacterium and other microbial growth can be restricted.
Described chromium slag is chromyl waste residue.
Preferably, the particle diameter of described chromium slag, for being less than 20mm, as 18mm, 16mm, 15mm, 12mm, 10mm, 8mm, 5mm, 4mm, 3mm, 2mm or 1mm etc., being preferably less than 15mm, being more preferably less than 5mm.
The kind of biosolids waste can affect the volatilization of ammonia nitrogen and the conversion of nitrogen in composting process, as preferred technical scheme, described biosolids waste is the combination of any one or at least two kinds in municipal sludge, rubbish from cooking or feces of livestock and poultry (as pig manure, chicken manure or cow dung etc.).
Preferably, the particle diameter of described biosolids waste, for being less than 30mm, as 28mm, 25mm, 24mm, 22mm, 20mm, 18mm, 16mm, 15mm, 12mm, 10mm, 8mm, 5mm, 4mm, 3mm, 2mm or 1mm etc., is preferably less than 20mm.
Described organic amendment is preferably containing xylogen and/or cellulosic agricultural and/or trade waste.
Preferably, described organic amendment is the combination of any one or at least two kinds in stalk, wood chip, sawdust, straw or wheat bran.
Preferably, the particle diameter of described organic amendment is for being less than 30mm, as 28mm, 25mm, 24mm, 22mm, 20mm, 18mm, 16mm, 15mm, 12mm, 10mm, 8mm, 5mm, 4mm, 3mm, 2mm or 1mm etc., be preferably less than 20mm, be more preferably less than 10mm.
Composting material is different, and time of compost maturity can difference to some extent, and those skilled in the art can adjust the time of compost according to practical situation.As preferred technical scheme, the described compost time is 30 ~ 70 days, and as 32 days, 35 days, 38 days, 40 days, 42 days, 45 days, 48 days, 50 days, 52 days, 55 days, 60 days, 65 days or 68 days etc., the compost time is too short, and hexavalent chrome reduction is not thorough.
Functional group containing a large amount of hydroxyl, amino, carboxyl, sulfonic group, alcoholic extract hydroxyl group or phenolic hydroxyl group etc. in the compost become thoroughly decomposed, to the good degrading effect of chromium slag, and temperature is the condition affecting compost maturity.As preferred technical scheme, in composting process, first heap temperature is warming up to 55 DEG C by 30 DEG C; Heap temperature is made to remain on 55 DEG C afterwards; Again heap temperature is reduced to 30 ~ 40 DEG C by 55 DEG C, as being reduced to 32 DEG C, 33 DEG C, 35 DEG C, 38 DEG C or 39 DEG C etc., finally keeping heap temperature to be 30 DEG C and terminating to compost.
Preferably, heap temperature was warming up to 55 DEG C by 30 DEG C in 5 days.
Preferably, heap temperature remain on 55 DEG C at least 10 days.
Preferably, heap temperature keeps 5 days at 30 ~ 40 DEG C, then under 30 DEG C of conditions, continues compost terminate to compost.
The oxygen level keeping heap body in described composting process is more than 15%, as 16%, 18%, 20%, 22%, 25%, 28%, 30%, 40%, 50% or 60% etc., is preferably more than 20%.
Preferably, the oxygen level of heap body is kept in composting process by turning and ventilation.
The humidity keeping heap body in described composting process is 40 ~ 80%, as 45%, 48%, 50%, 52%, 55%, 58%, 60%, 65%, 70%, 75% or 78% etc., is preferably 40 ~ 60%.
Preferably, the humidity of piling body is kept by adding water in composting process.
As preferred technical scheme, described biological process chromium slag biologic detoxication the method preparing bio-organic fertilizer comprise the steps:
(1) particle diameter is less than the chromium slag that the biosolids waste of 30mm and organic amendment and particle diameter be less than 20mm to mix, the mass ratio of described biosolids waste and chromium slag is 1:(1 ~ 5), the add-on of described organic amendment is 15% ~ 45% of biological solid waste and chromium slag total mass;
(2) step (1) gained mixture is carried out aerobic compost, the oxygen level controlling heap body is more than 15%, and humidity is 40% ~ 80%, and the compost time is 30 ~ 70 days, and in 5 days after compost starts, heap temperature is 30 ~ 55 DEG C; In 5 ~ 15 days after compost starts, heap temperature is 55 DEG C, in 15 ~ 50 days after compost starts, first by near for heap temperature 30 ~ 40 DEG C, and maintain 5 days, keep heap temperature to be 30 DEG C afterwards and terminate to compost, namely obtain the bio-organic fertilizer that content of 6-valence Cr ions is up to standard.
Compared with prior art, beneficial effect of the present invention is:
Biologic detoxication method for dregs of chrome provided by the invention, under the prerequisite effectively controlling compost cost, take full advantage of a large amount of microorganisms that biosolids waste contains itself, by controlling content and the proportioning of each component of organism in compost material, sexavalent chrome in chromium slag is fixed by effective Reduce and adsorption, reach the object of rapid detoxification chromium slag, in chromium slag after removing toxic substances, content of 6-valence Cr ions reduces greatly, chromium slag Leaching detects the limit value lower than [Cr (VI)]≤10mg/L required in " Hazardous wastes judging standard-leaching characteristic identification " (GB5085.3-1996), substantially increase the safety in utilization of fertilizer.
The invention provides biologic detoxication method for dregs of chrome, do not change fertilizer character, and chromium residue detoxifying is effective, achieve innoxious, stabilization and the resource utilization of chromium slag and biosolids waste, and can the higher high-quality biological organic fertilizer product of production added value.
The present invention adopts biosolids castoff compost detoxification chromium slag, realizes the treatment of wastes with processes of wastes against one another, features such as having less investment, cost is low, processing mode is various, detoxifying effect is good, and the bio-organic fertilizer prepared after compost directly can realize the recycling of chromium slag.
Embodiment
Technical scheme of the present invention is further illustrated below by embodiment.
Embodiment 1
According to the ratio that municipal sludge and chromium slag mass ratio (dry weight) are 1:1, take municipal sludge 600g (dry weight) respectively, chromium slag 600g (dry weight), abundant mixing, and add 530g stalk as amendment, stalk accounts for 45% of biosolids waste and chromium slag total amount, and make C/N in heap body be 26, the moisture content of heap body is about 50%; Compost adopts the offering oxygen way of turning and ventilation, compost initial stage turning every day 2 times, and turning every day 1 time after a week, air flow is 0.5m
3/ min, keeps heap body oxygen level to be 20%; The compost time is 35 days, in composting process, and heap temperature was warming up to 55 DEG C by 30 DEG C in 5 days, keeps 10 days afterwards, be then cooled to 30 DEG C by 55 DEG C at 55 DEG C, keeps heap temperature to be 30 DEG C and terminates to compost.
The Leaching of chromium slag and the existing forms of chromium after regular sampling analysis removing toxic substances, chromium Leaching adopts HJ/T299 sulfonitric method to leach.
Detected result shows: sexavalent chrome leaching concentration drops to below the 5mg/L after process from 46mg/L before treatment, exchangeable species and carbonate combined reduce, organic and iron and manganese oxides combined raise, and show that chromium form changes into stable state by free state, and migration is less likely to occur.
Embodiment 2
According to the ratio of cow dung and chromium slag mass ratio (dry weight) 1:1, take cow dung 600g (dry weight) respectively, chromium slag 600g (dry weight), abundant mixing, and add 215g stalk as amendment, account for 18% of biosolids waste and chromium slag total amount, make heap body C/N be 30, the moisture content of heap body is about 60%; Compost adopts the offering oxygen way of turning and ventilation, compost initial stage turning every day 2 times, and turning every day 1 time after a week, air flow is 0.35m
3/ min, keeps oxygen level to be 15%; The compost time is 30 days, in composting process, and heap temperature was warming up to 55 DEG C by 30 DEG C in 5 days, keeps afterwards being then cooled to 30 DEG C by 55 DEG C in 10 days, keep heap temperature to be 30 DEG C and terminate to compost at 55 DEG C.
The Leaching of chromium slag and the existing forms of chromium after regular sampling analysis removing toxic substances, chromium Leaching adopts HJ/T299 sulfonitric method to leach.
Detected result shows: sexavalent chrome leaching concentration drops to below the 10mg/L after process from 74mg/L before treatment, exchangeable species and carbonate combined reduce, organic and iron and manganese oxides combined raise, and show that chromium form changes into stable state by free state, and migration is less likely to occur.
Embodiment 3
According to the ratio of chicken manure and chromium slag mass ratio (dry weight) 1:1, take chicken manure 600g (dry weight) respectively, chromium slag 600g (dry weight), abundant mixing, and add 515g stalk as amendment, account for 43% of biosolids waste and chromium slag total amount, make the mass ratio of C/N be 24.The 1500g that adds water makes the moisture content of compost about 80%, and compost adopts the offering oxygen way of turning and ventilation, compost initial stage turning every day 2 times, and turning every day 1 time after a week, air flow is 0.35m
3/ min, keeps heap body oxygen level to be 15%; The compost time is 40 days, in composting process, and heap temperature was warming up to 55 DEG C by 30 DEG C in 5 days, keeps 10 days afterwards, be then cooled to 30 DEG C by 55 DEG C at 55 DEG C, keeps heap temperature to be 30 DEG C and terminates to compost.
The Leaching of chromium slag and the existing forms of chromium after regular sampling analysis removing toxic substances, chromium Leaching adopts HJ/T299 sulfonitric method to leach.
Detected result shows: sexavalent chrome leaching concentration drops to below the 10mg/L after process from 60mg/L before treatment, exchangeable species and carbonate combined reduce, organic and iron and manganese oxides combined raise, and show that chromium form changes into stable state by free state, and migration is less likely to occur.
Embodiment 4
According to the ratio of cow dung and chromium slag mass ratio (dry weight) 1:2, take cow dung 500g (dry weight) respectively, chromium slag 1000g (dry weight), abundant mixing, and add 465g stalk as amendment, account for 31% of biosolids waste and chromium slag total amount, make C/N be 26, the moisture content of compost is about 40%; Compost adopts the offering oxygen way of turning and ventilation, compost initial stage turning every day 2 times, and turning every day 1 time after a week, air flow is 0.65m
3/ min, keeps heap body oxygen level to be 25%; The compost time is 45 days, in composting process, and heap temperature was warming up to 55 DEG C by 30 DEG C in 5 days, keeps 10 days afterwards, be then cooled to 30 DEG C by 55 DEG C at 55 DEG C, keeps heap temperature to be 30 DEG C and terminates to compost.
The Leaching of chromium slag and the existing forms of chromium after regular sampling analysis removing toxic substances, chromium Leaching adopts HJ/T299 sulfonitric method to leach.
Detected result shows: sexavalent chrome leaching concentration drops to below the 10mg/L after process from 88mg/L before treatment, exchangeable species and carbonate combined reduce, organic and iron and manganese oxides combined raise, and show that chromium form changes into stable state by free state, and migration is less likely to occur.
Embodiment 5
According to the ratio of cow dung and chromium slag mass ratio (dry weight) 1:3, take cow dung 333g (dry weight) respectively, chromium slag 1000g (dry weight), abundant mixing, and add 310g stalk as amendment, account for 23.5% of biosolids waste and chromium slag total amount, make C/N be 24, the moisture content of heap body is 60%; Compost adopts the offering oxygen way of turning and ventilation, compost initial stage turning every day 2 times, and turning every day 1 time after a week, air flow is 0.35m
3/ min, keeps heap body oxygen level to be 15%; The compost time is 50 days, in composting process, and heap temperature was warming up to 55 DEG C by 30 DEG C in 5 days, keeps 10 days afterwards, be then cooled to 30 DEG C by 55 DEG C at 55 DEG C, keeps heap temperature to be 30 DEG C and terminates to compost.
The Leaching of chromium slag and the existing forms of chromium after regular sampling analysis removing toxic substances, chromium Leaching adopts HJ/T299 sulfonitric method to leach.
Detected result shows: sexavalent chrome leaching concentration drops to below the 10mg/L after process from 105mg/L before treatment, exchangeable species and carbonate combined reduce, organic and iron and manganese oxides combined raise, and show that chromium form changes into stable state by free state, and migration is less likely to occur.
Embodiment 6
According to the ratio of cow dung and chromium slag mass ratio (dry weight) 1:5, take cow dung 250g (dry weight) respectively, chromium slag 1000g (dry weight), abundant mixing, and add 232g stalk as amendment, account for 18.5% of biosolids waste and chromium slag total amount, make C/N be 20, the moisture content of heap body is about 60%; Compost adopts the offering oxygen way of turning and ventilation, compost initial stage turning every day 2 times, and turning every day 1 time after a week, air flow is 0.8m
3/ min, heap body oxygen level is 30%; The compost time is 40 days, in composting process, and heap temperature was warming up to 55 DEG C by 30 DEG C in 5 days, keeps 10 days afterwards, be then cooled to 30 DEG C by 55 DEG C at 55 DEG C, keeps heap temperature to be 30 DEG C and terminates to compost.
The Leaching of chromium slag and the existing forms of chromium after regular sampling analysis removing toxic substances, chromium Leaching adopts HJ/T299 sulfonitric method to leach.
Detected result shows: sexavalent chrome leaching concentration drops to below the 10mg/L after process from 116mg/L before treatment, exchangeable species and carbonate combined reduce, organic and iron and manganese oxides combined raise, and show that chromium form changes into stable state by free state, and migration is less likely to occur.
Embodiment 7
According to the ratio of cow dung and chromium slag mass ratio (dry weight) 1:5, take cow dung 250g (dry weight) respectively, chromium slag 1000g (dry weight), abundant mixing, and add 188g stalk as amendment, account for 15% of biosolids waste and chromium slag total amount, make C/N be 18, the moisture content of heap body is about 60%; Compost adopts the offering oxygen way of turning and ventilation, compost initial stage turning every day 2 times, and turning every day 1 time after a week, air flow is 0.8m
3/ min, heap body oxygen level is 30%; The compost time is 45 days, in composting process, and heap temperature was warming up to 55 DEG C by 30 DEG C in 5 days, keeps 10 days afterwards, be then cooled to 30 DEG C by 55 DEG C at 55 DEG C, keeps heap temperature to be 30 DEG C and terminates to compost.
The Leaching of chromium slag and the existing forms of chromium after regular sampling analysis removing toxic substances, chromium Leaching adopts HJ/T299 sulfonitric method to leach.
Detected result shows: sexavalent chrome leaching concentration drops to below the 15mg/L after process from 116mg/L before treatment, exchangeable species and carbonate combined reduce, organic and iron and manganese oxides combined raise, and show that chromium form changes into stable state by free state, and migration is less likely to occur.
Comparative example 1
Except not containing except cow dung, all the other are identical with embodiment 5.
The Leaching of chromium slag and the existing forms of chromium after regular sampling analysis removing toxic substances, chromium Leaching adopts HJ/T299 sulfonitric method to leach.
Detected result shows: sexavalent chrome leaching concentration drops to the 79mg/L after process from 116mg/L before treatment.
Comparative example 2
Except not containing except stalk, all the other are identical with embodiment 5.
The Leaching of chromium slag and the existing forms of chromium after regular sampling analysis removing toxic substances, chromium Leaching adopts HJ/T299 sulfonitric method to leach.
Detected result shows: sexavalent chrome leaching concentration drops to the 85mg/L after process from 116mg/L before treatment.
Applicant states, the present invention illustrates method detailed of the present invention by above-described embodiment, but the present invention is not limited to above-mentioned method detailed, does not namely mean that the present invention must rely on above-mentioned method detailed and could implement.Person of ordinary skill in the field should understand, any improvement in the present invention, to equivalence replacement and the interpolation of ancillary component, the concrete way choice etc. of each raw material of product of the present invention, all drops within protection scope of the present invention and open scope.
Claims (9)
1. chromium slag biologic detoxication prepare the method for bio-organic fertilizer, it is characterized in that, described method is: biosolids waste, chromium slag and organic amendment are mixed laggard row aerobic compost, obtains the bio-organic fertilizer that content of 6-valence Cr ions is up to standard.
2. method according to claim 1, is characterized in that, before compost, in the mixture of described biosolids waste, chromium slag and organic amendment, C/N is 20 ~ 30;
Preferably, the mass ratio of described biosolids waste and chromium slag is 1:(1 ~ 5), be preferably 1:(1 ~ 3);
Preferably, the quality of described organic amendment accounts for 15 ~ 45% of the total mass of biosolids waste and chromium slag, is preferably 25 ~ 45%.
3. method according to claim 1 and 2, is characterized in that, described chromium slag is chromyl waste residue;
Preferably, the particle diameter of described chromium slag, for being less than 20mm, being preferably less than 15mm, being more preferably less than 5mm.
4. according to the method one of claim 1-3 Suo Shu, it is characterized in that, described biosolids waste is the combination of any one or at least two kinds in municipal sludge, rubbish from cooking or feces of livestock and poultry;
Preferably, the particle diameter of described biosolids waste, for being less than 30mm, is preferably less than 20mm.
5. according to the method one of claim 1-4 Suo Shu, it is characterized in that, described organic amendment is for containing xylogen and/or cellulosic agricultural and/or trade waste;
Preferably, described organic amendment is the combination of any one or at least two kinds in stalk, wood chip, sawdust, straw or wheat bran;
Preferably, the particle diameter of described organic amendment is less than 30mm, is preferably less than 20mm, is more preferably less than 10mm.
6. according to the method one of claim 1-5 Suo Shu, it is characterized in that, the time of compost is 30 ~ 70 days;
Preferably, in composting process, first heap temperature is warming up to 55 DEG C by 30 DEG C; Heap temperature is made to remain on 55 DEG C afterwards; Again heap temperature is reduced to 30 ~ 40 DEG C by 55 DEG C, finally keeps heap temperature to be 30 DEG C and terminate to compost;
Preferably, heap temperature was warming up to 55 DEG C by 30 DEG C in 5 days;
Preferably, heap temperature remain on 55 DEG C at least 10 days;
Preferably, heap temperature keeps 5 days at 30 ~ 40 DEG C, then under 30 DEG C of conditions, continues compost terminate to compost.
7. according to the method one of claim 1-6 Suo Shu, it is characterized in that, the oxygen level keeping heap body in described composting process is more than 15%, is preferably more than 20%;
Preferably, the oxygen level of heap body is kept in composting process by turning and ventilation.
8. according to the method one of claim 1-7 Suo Shu, it is characterized in that, the humidity keeping heap body in described composting process is 40 ~ 80%, is preferably 40 ~ 60%;
Preferably, the humidity of piling body is kept by adding water in composting process.
9. according to the method one of claim 1-8 Suo Shu, it is characterized in that, described method comprises the steps:
(1) particle diameter is less than the chromium slag that the biosolids waste of 3cm and organic amendment and particle diameter be less than 2cm to mix, the mass ratio of described biosolids waste and chromium slag is 1:(1 ~ 5), the add-on of described organic amendment is 15% ~ 45% of biological solid waste and chromium slag total mass;
(2) step (1) gained mixture is carried out aerobic compost, the oxygen level controlling heap body is more than 15%, and humidity is 40% ~ 80%, and the compost time is 30 ~ 70 days, and in 5 days after compost starts, heap temperature is warming up to 55 DEG C by 30 DEG C; In 5 ~ 15 days after compost starts, heap temperature is 55 DEG C, in 15 ~ 50 days after compost starts, first by near for heap temperature 30 ~ 40 DEG C, maintain 5 days, keep heap temperature to be 30 DEG C afterwards and terminate to compost, namely obtain the bio-organic fertilizer that content of 6-valence Cr ions is up to standard.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105753528A (en) * | 2016-03-01 | 2016-07-13 | 侯绪华 | Chromium slag detoxification system and method |
| CN110527519A (en) * | 2019-09-05 | 2019-12-03 | 中国科学院过程工程研究所 | A kind of soil-repairing agent and its application after chromium-polluted soil reparation in inhibition " brightness reversion " |
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| CN110527519A (en) * | 2019-09-05 | 2019-12-03 | 中国科学院过程工程研究所 | A kind of soil-repairing agent and its application after chromium-polluted soil reparation in inhibition " brightness reversion " |
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