CN104016730A - Method for reducing activity of heavy metal ions in excrements of livestocks by adding sodium diethyldithiocarbamate trihydrate - Google Patents
Method for reducing activity of heavy metal ions in excrements of livestocks by adding sodium diethyldithiocarbamate trihydrate Download PDFInfo
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- CN104016730A CN104016730A CN201410232998.8A CN201410232998A CN104016730A CN 104016730 A CN104016730 A CN 104016730A CN 201410232998 A CN201410232998 A CN 201410232998A CN 104016730 A CN104016730 A CN 104016730A
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- diethyldithiocarbamate
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A40/00—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production
- Y02A40/10—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production in agriculture
- Y02A40/20—Fertilizers of biological origin, e.g. guano or fertilizers made from animal corpses
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Abstract
The invention belongs to the field of preparation of organic fertilizers, and concretely relates to a method for reducing the activity of heavy metal ions in excrements of livestock by adding sodium diethyldithiocarbamate trihydrate. The method comprises: under the condition of continuous turning over or stirring, sprinkling an aqueous solution sodium diethyldithiocarbamate trihydrate into excrements of livestock, controlling the pH value to be 6-7, and then standing for 2-3 h, so as to enable state-exchangeable heavy metal ions to have a complexation reaction with sodium diethyldithiocarbamate trihydrate and to be passivated, so as to reduce the biological activity of the heavy metal ions. sodium diethyldithiocarbamate trihydrate employed by the method has extremely strong passivation capability on state-exchangeable heavy metal ions in excrements of livestock, and a relatively high heavy-metal passivation rate can be obtained and the passivation effect is relatively good when the usage amount of the pasivation agent is less, and sodium diethyldithiocarbamate trihydrate is applicable to moderate and mild heavy-metal-polluted excrements, also is usable as a technology for restoring heavy-metal-polluted soil, and has substantial effect on composite pollution caused by multiple heavy-metal elements.
Description
Technical field
The invention belongs to organic fertilizer preparation field, be specifically related to a kind of method of adding heavy metal ion activity in diethyldithiocarbamate reduction feces of livestock and poultry.
Background technology
In recent years, livestock industry is gradually to maximization, modernization development, and the quantity of its feeding significantly increases.But livestock industry, when the sufficient food such as meat, eggs is provided for us, has also produced some environmental problems, as has produced a large amount of stenches, polluted air etc.Meanwhile, feces of livestock and poultry is again good fertilizer, containing a large amount of phosphorus and nitrogen, is manure resources important in China's agriculture production.Therefore, proposing efficient, innoxious feces of livestock and poultry treatment process is the important channel that solves feces of livestock and poultry pollution problem.
In cultivation industry, the people's feed of livestock and poultry containing trace elements such as the copper of high density, zinc, selenium, arsenic of often feeding in a large number, most of heavy metal is excreted by feces of livestock and poultry, and the agricultural use of these feces of livestock and poultry can make heavy metal accumulate in soil and have the risk that exceedes volume weight of soils, and soil is caused to severe contamination, even along with biologic chain enrichment, the life and health of final harm humans." black leg " that " itai-itai disease " in Mount Fuji, Japan county and Thailand occur is all typical example.Therefore, how to reduce the biological effectiveness of heavy metal in feces of livestock and poultry, the plant absorbed dose reducing after using is the key of feces of livestock and poultry Fertilizer Transformed.
At present, existing a lot of about the research of heavy metal contamination in feces of livestock and poultry, main solution has following two kinds: the one, change the form that exists of heavy metal, and make it fix and stablize, reduce its transport property and bioavailability in environment; The 2nd, removal heavy metal from feces of livestock and poultry, after utilizing special plant to be absorbed, again this plant is removed, or the heavy metal in feces of livestock and poultry is become to soluble state, free state by engineering, after drip washing, collect again the heavy metal in leacheate, thereby reach the dual purpose that reclaims heavy metal and reduce heavy metal in feces of livestock and poultry, utilize the scheme of plant absorption process processing, Financial cost is lower, but the cycle is long, take time and effort, take effect slow, and plant is limited to absorbing of heavy metal, the later stage processing of plant is comparatively difficult; Utilize engineering to reclaim the scheme of heavy metal, although can reach the dual purpose that reclaims heavy metal and reduce heavy metal in feces of livestock and poultry, increase factory economy income, then heavy metal recovery process flow process complexity is loaded down with trivial details, and cost is higher.The research application of the first scheme is comparatively extensive, the method of traditional curing stabilizing heavy metal ion is to use sodium sulphite sulfides heavy metal-passivated as passivator, thereby reach the object of removal heavy metal, sodium sulphite good passivation effect, deactivation rate is high, but industrial application consumption is large, expensive, Financial cost is higher, and residual sodium ion can cause secondary pollution to soil.
Summary of the invention
The problem existing for prior art, the invention provides a kind of method of adding heavy metal ion activity in diethyldithiocarbamate reduction feces of livestock and poultry, object is significantly to reduce the biological effectiveness of soluble heavy metal in feces of livestock and poultry, in the feces of livestock and poultry such as chicken manure, heavy metal passivation efficiency is high, consumption is few, passivation product is stable, applied widely.
Realizing the technical scheme of the object of the invention carries out according to following steps:
Under the condition of constantly stirring or stirring, in feces of livestock and poultry, spray the diethyldithiocarbamate aqueous solution, control pH value=6-7, then leave standstill 2-3 hour, exchangeable species heavy metal ion Mn, Zn, Cu and Cr in ight soil and diethyldithiocarbamate generation complex reaction and passivation, the deactivation rate of exchangeable species Mn is at least 40%, and the deactivation rate of exchangeable species Cu, Zn and Cr is at least 60%.
Described diethyldithiocarbamate aqueous solution mass concentration is 20-50%, and the amount of application of diethyldithiocarbamate is the 0.15-0.30% of feces of livestock and poultry dry weight.
Consider that passivating material fully contacts and is conducive to improve passivation repairing effect with passivator, while use at the scene, can first with agricultural machine, pollution ight soil be turned over, and bulk is smashed, then spray after passivating material and again turn over evenly.
Compared with prior art, feature of the present invention and beneficial effect are:
The heavy metal-passivated principle of the inventive method is:
Diethyldithiocarbamate has very strong complex performance, it contains dithionic acid root bitooth ligand, can generate precipitation with most of heavy metal ion generation complex reactions, after it is added in the ight soil after heavy metal contamination, can with the series reaction such as heavy metal ion generation surface complexation, ion-exchange and co-precipitation, promote heavy metal element to have active higher form to the lower form transformation of activity, thereby reduce biological effectiveness and the transportable property of heavy metal, reach the object that passivation is repaired.
The invention has the advantages that:
(1) taking diethyldithiocarbamate as heavy metal deactivator, composition is single, and raw material sources are extensive, and Financial cost is lower.
(2) passivation efficiency is high, and repairing effect is good.Diethyldithiocarbamate is very strong to the passivation ability of exchangeable species heavy metal in feces of livestock and poultry, in the time that passivator consumption is little, can obtain higher heavy metal deactivation rate, and passivation effect is better.
(3) applied widely.Passivation restorative procedure of the present invention can in, in the ight soil of slight heavy metal contamination, use, the recovery technique that also can be used as heavy-metal contaminated soil is used, the combined pollution causing for detection device for multi metallic elements also has unusual effect.
(4) technical process is simple, easy to operate, and commercial viability is better.
Embodiment
In the embodiment of the present invention, content × 100% of exchangeable species heavy metal ion before passivation in exchangeable species heavy metal deactivation rate=(in sample after the content-passivation of exchangeable species heavy metal ion the content of this exchangeable species metal ion)/sample.
Described diethyldithiocarbamate is that product is bought in market.
Embodiment 1
Under the condition of constantly stirring or stirring, in fresh goose excrement, spray the diethyldithiocarbamate aqueous solution, diethyldithiocarbamate aqueous solution mass concentration is 20%, amount of application is by adding 1.5g diethyldithiocarbamate in every 1000kg raw material, control pH value=6.2, then standing 2 hours, make exchangeable species heavy metal ion in ight soil and diethyldithiocarbamate generation complex reaction and passivation, its ionic activity reduces, and passivation effect is in table 1.
Embodiment 2
Under the condition of constantly stirring or stirring, in fresh goose excrement, spray the diethyldithiocarbamate aqueous solution, diethyldithiocarbamate aqueous solution mass concentration is 20%, amount of application is by adding 2.0g diethyldithiocarbamate in every 1000kg raw material, control pH value=6.2, then standing 2 hours, make exchangeable species heavy metal ion in ight soil and diethyldithiocarbamate generation complex reaction and passivation, its ionic activity reduces, and passivation effect is in table 1.
Embodiment 3
Under the condition of constantly stirring or stirring, in fresh goose excrement, spray the diethyldithiocarbamate aqueous solution, diethyldithiocarbamate aqueous solution mass concentration is 20%, amount of application is by adding 3.0g diethyldithiocarbamate in every 1000kg raw material, control pH value=6.2, then standing 2 hours, make exchangeable species heavy metal ion in ight soil and diethyldithiocarbamate generation complex reaction and passivation, reduce its biological activity, passivation effect is in table 1.
With the goose excrement that do not add passivator in contrast, the passivation effect of heavy metal is shown in Table 1.
The passivation effect of table 1 heavy metal deactivator to exchangeable species heavy metal in goose excrement
As shown in Table 1, diethyldithiocarbamate is remarkable to the passivation effect of exchangeable species Mn, Zn, Cu, Cr in feces of livestock and poultry, and heavy metal deactivation rate is all higher.After diethyldithiocarbamate passivation, in feces of livestock and poultry, the highest deactivation rate of exchangeable species Mn, Zn, Cu, Cr is respectively 42.41%, 91.33%, 75%, and 100%.
Embodiment 4
Under the condition of constantly stirring or stirring, in fresh goose excrement, spray the diethyldithiocarbamate aqueous solution, diethyldithiocarbamate aqueous solution mass concentration is 50%, amount of application is by adding 2.0g diethyldithiocarbamate in every 1000kg raw material, control pH value=6.0, then standing 3 hours, make exchangeable species heavy metal ion in ight soil and diethyldithiocarbamate generation complex reaction and passivation, its ionic activity reduces, and passivation effect is in table 2.
Embodiment 5
Under the condition of constantly stirring or stirring, in fresh goose excrement, spray the diethyldithiocarbamate aqueous solution, diethyldithiocarbamate aqueous solution mass concentration is 50%, amount of application is by adding 2.0g diethyldithiocarbamate in every 1000kg raw material, control pH value=6.5, then standing 3 hours, make exchangeable species heavy metal ion in ight soil and diethyldithiocarbamate generation complex reaction and passivation, its ionic activity reduces, and passivation effect is in table 2.
Embodiment 6
Under the condition of constantly stirring or stirring, in fresh goose excrement, spray the diethyldithiocarbamate aqueous solution, diethyldithiocarbamate aqueous solution mass concentration is 50%, amount of application is by adding 2.0g diethyldithiocarbamate in every 1000kg raw material, control pH value=7.0, then standing 3 hours, make exchangeable species heavy metal ion in ight soil and diethyldithiocarbamate generation complex reaction and passivation, its ionic activity reduces, and passivation effect is in table 2.
With the goose excrement that do not add passivator in contrast, the passivation effect of heavy metal is shown in Table 2.
The passivation effect of table 2 pH value of reaction system to exchangeable species heavy metal in goose excrement
As shown in Table 2, pH value of reaction system is increased at 7.0 o'clock gradually from 6.0, and in feces of livestock and poultry, the passivation effect of exchangeable species Mn, Zn, Cu, Cr is remarkable, and heavy metal deactivation rate all constantly raises.Be 6.0 in system pH, 6.5,7.0 time, in feces of livestock and poultry, the deactivation rate of exchangeable species Mn is respectively 40.01%, 41.06% and 48.54%, the deactivation rate of Zn is respectively 60.67%, 66.67% and 74.67%, the deactivation rate of Cu be respectively 61.67%, 62.33% and the deactivation rate of 66.67%, Cr be respectively 65.79%, 100% and 100%.
Embodiment 7
Under the condition of constantly stirring or stirring, in fresh goose excrement, spray the diethyldithiocarbamate aqueous solution, diethyldithiocarbamate aqueous solution mass concentration is 40%, amount of application is by adding 2.0g diethyldithiocarbamate in every 1000kg raw material, control pH value=7.0, then standing 2.5 hours, make exchangeable species heavy metal ion in ight soil and diethyldithiocarbamate generation complex reaction and passivation, its ionic activity reduces, and the deactivation rate of Mn, Zn, Cu, Cr is respectively 43.09%, 62.01%, 100%.
Claims (2)
1. a method of adding heavy metal ion activity in diethyldithiocarbamate reduction feces of livestock and poultry, is characterized in that carrying out according to following steps:
Under the condition of constantly stirring or stirring, in feces of livestock and poultry, spray the diethyldithiocarbamate aqueous solution, control pH value=6-7, then leave standstill 2-3 hour, exchangeable species heavy metal ion Mn, Zn, Cu and Cr in ight soil and diethyldithiocarbamate generation complex reaction and passivation, the deactivation rate of exchangeable species Mn is at least 40%, and the deactivation rate of exchangeable species Cu, Zn and Cr is at least 60%.
2. a kind of method of adding heavy metal biological activity in diethyldithiocarbamate reduction feces of livestock and poultry according to claim 1, is characterized in that described diethyldithiocarbamate aqueous solution mass concentration is 20-50%, and the amount of application of diethyldithiocarbamate is the 0.15-0.30% of feces of livestock and poultry dry weight.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105565461A (en) * | 2015-12-23 | 2016-05-11 | 曹阳 | Chromium-containing industrial wastewater processing method |
Citations (2)
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|---|---|---|---|---|
| CN101696136A (en) * | 2009-11-05 | 2010-04-21 | 湖南农业大学 | Passivating agent for reducing bioavailability of heavy metals in livestock waste compost and using method thereof |
| CN102701806A (en) * | 2012-05-02 | 2012-10-03 | 云南省烟草农业科学研究院 | Composting process capable of effectively decreasing heavy-metal activity of farm manure |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101696136A (en) * | 2009-11-05 | 2010-04-21 | 湖南农业大学 | Passivating agent for reducing bioavailability of heavy metals in livestock waste compost and using method thereof |
| CN102701806A (en) * | 2012-05-02 | 2012-10-03 | 云南省烟草农业科学研究院 | Composting process capable of effectively decreasing heavy-metal activity of farm manure |
Non-Patent Citations (1)
| Title |
|---|
| 张海军等: "采用巯基捕收剂稳定化处理垃圾焚烧飞灰中的重金属", 《环境科学》, no. 08, 15 August 2007 (2007-08-15) * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105565461A (en) * | 2015-12-23 | 2016-05-11 | 曹阳 | Chromium-containing industrial wastewater processing method |
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