CN104829087A - Deep dehydration method of sludge for fertilizer production in subsequent steps - Google Patents
Deep dehydration method of sludge for fertilizer production in subsequent steps Download PDFInfo
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- CN104829087A CN104829087A CN201510213734.2A CN201510213734A CN104829087A CN 104829087 A CN104829087 A CN 104829087A CN 201510213734 A CN201510213734 A CN 201510213734A CN 104829087 A CN104829087 A CN 104829087A
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Abstract
The invention relates to a deep dehydration method of sludge for fertilizer production in subsequent steps. The deep dehydration method comprises the following steps: step A, adding water into primarily-dehydrated sludge with a water content of 80% or more from living water until the water content reaches 94% or so, then adding ferric trichloride with a concentration of 28% into the primarily-dehydrated sludge (4.5 to 6 kilograms of ferric trichloride for each 100 kilograms of sludge), and stirring for 10 to 15 minutes; step B, adding ammonia liquor with an ammonia content of 20% into the sludge obtained in the step A (1.6 to 1.7 kilograms of ammonia liquor for each 100 kilograms of sludge), adjusting the pH value of the sludge to 5-6.5, stirring for 10 to 20 minutes, and finally extruding and dehydrating the sludge by a sludge dehydrating device. In the provided method, no solid substance is added, thus the amount of solid sludge will not be increased, moreover, the pH values of the sludge cake and percolate are proper, and the post treatment becomes easier.
Description
Technical field
The present invention relates to the process of mud, particularly relate to a kind of follow-up deep dehydration method for sludge for fertilizer.
Background technology
In order to by sanitary wastewater sludge dewatering to water ratio less than 60%, prior art adopts the lime that from sewage work preliminary hydro-extraction domestic sludge according to 100 kilogram mud adds 5-7 kilogram iron trichloride and 10-15 kilogram of water ratio more than 80%, then stirs; Utilize sludge dehydration device to carry out extrusion dehydration to mud, can realize allowing sludge dewatering be less than 60% to water ratio.Filtrate after process, due to basicity severe overweight, also causes difficulty for follow-up process.In addition, owing to needing to add a large amount of solid matters, solid matter addition is the 50%-60% of mud dry-matter, causes final solid sludges amount to increase.
Summary of the invention
For solving the problems of the technologies described above, the invention provides one and do not add solid matter, final solid sludges amount can not be caused to increase, the sludge cake after process and the potential of hydrogen of percolate moderate, be conducive to the follow-up deep dehydration method for sludge for fertilizer of follow-up further disposal.
The follow-up deep dehydration method for sludge for fertilizer of the present invention, comprises the following steps:
A. by the preliminary hydro-extraction mud from domestic water of water ratio more than 80%, be diluted with water to water ratio about 94%, or the mud of water ratio 99.3% in Sewage Plant second pond is concentrated into the mud of water ratio 94% through flocculation and gravity concentration equipment, the ratio of 4.5-6 kilogram of iron trichloride is added according to 100 kilograms of mud, in preliminary hydro-extraction mud, add the iron trichloride of concentration 28%, then stir 10-15 minute;
B. add the ratio of 1.6-1.7 kilogram of ammoniacal liquor in the mud obtained to steps A according to 100 kilograms of mud, add the ammoniacal liquor of ammonia content 20% to mud, the potential of hydrogen of adjustment sludge water, makes its pH value be 5-6.5, then stirs 10-20 minute; Then sludge dehydration device is utilized to carry out extrusion dehydration to mud.
Beneficial effect of the present invention: owing to adding iron trichloride, reach the cell walls of the water molecules wrapped up in flocculation and destruction sewage, water molecules, under the effect of external force, is easily separated out; Add ammoniacal liquor and not only can regulate pH value, also can play the effect of flocculation with ferric chloride reaction, meanwhile, also can increase fertilizer efficiency.Because iron trichloride is very easily water-soluble, therefore the present invention does not add solid matter, and final solid sludges amount can not be caused to increase, the sludge cake after process and the potential of hydrogen of percolate moderate, be conducive to follow-up further disposal.The present invention can work as Fertilizer application.
Embodiment
Below in conjunction with embodiment, the specific embodiment of the present invention is described in further detail, spirit of the present invention can be understood better.Following examples for illustration of the present invention, but are not used for limiting the scope of the invention.
Embodiment 1
The invention provides a kind of follow-up deep dehydration method for sludge for fertilizer, comprise the following steps:
A. the preliminary hydro-extraction mud from domestic water of water ratio more than 80% is diluted with water to water ratio about 94%; (former mud source: northern river sewage work, former mud pH value is 6.5), adds the ratio of 4.5 kilograms of iron trichlorides, adds the iron trichloride of concentration 28% in preliminary hydro-extraction mud, then stir 15 minutes according to 100 kilograms of mud;
B. add the ratio of 1.6 kilograms of ammoniacal liquor in the mud obtained to steps A according to 100 kilograms of mud, add the ammoniacal liquor of ammonia content 20% to mud, the potential of hydrogen of adjustment sludge water, makes its pH value be 5, then stirs 10-20 minute; Then sludge dehydration device is utilized to carry out extrusion dehydration to mud.
After testing, after press filtration mud cake water ratio 55%, after press filtration, the pH value of filtrate is 6.
Embodiment 2
The invention provides a kind of follow-up deep dehydration method for sludge for fertilizer, comprise the following steps:
A. by the preliminary hydro-extraction mud from domestic water of water ratio more than 80%, be diluted with water to water ratio about 94%, (former mud source: Changping treatment center of sewage, former mud pH value is 7), the ratio of 5.5 kilograms of iron trichlorides is added according to 100 kilograms of mud, in preliminary hydro-extraction mud, add the iron trichloride of concentration 28%, then stir 13 minutes;
B. add the ratio of 1.65 kilograms of ammoniacal liquor in the mud obtained to steps A according to 100 kilograms of mud, add the ammoniacal liquor of ammonia content 20% to mud, the potential of hydrogen of adjustment sludge water, makes its pH value be 5.5, then stirs 20 minutes; Then sludge dehydration device is utilized to carry out extrusion dehydration to mud.
After testing, the water ratio 53% of mud after process, pH value is 6.2.
Embodiment 3
The invention provides a kind of follow-up deep dehydration method for sludge for fertilizer, comprise the following steps:
A. by the preliminary hydro-extraction mud from domestic water of water ratio more than 80%, be diluted with water to water ratio about 94% (former mud source: Huairou sewage work, former mud pH value is 7), the ratio of 6 kilograms of iron trichlorides is added according to 100 kilograms of mud, in preliminary hydro-extraction mud, add the iron trichloride of concentration 28%, then stir 15 minutes;
B. add the ratio of 1.7 kilograms of ammoniacal liquor in the mud obtained to steps A according to 100 kilograms of mud, add the ammoniacal liquor of ammonia content 20% to mud, the potential of hydrogen of adjustment sludge water, makes its pH value be 6.5, then stirs 15 minutes; Then sludge dehydration device is utilized to carry out extrusion dehydration to mud.
After testing, the water ratio 50% of mud after process, pH value is 6.5.
Embodiment 4
The invention provides a kind of follow-up deep dehydration method for sludge for fertilizer, comprise the following steps:
A. the mud of the water ratio about 99.3% in Sewage Plant second pond is concentrated into mud (the former mud source: northern river sewage work of water ratio about 94% through flocculation and gravity concentration equipment, former mud pH value is 6.8), the ratio of 5 kilograms of iron trichlorides is added according to 100 kilograms of mud, in preliminary hydro-extraction mud, add the iron trichloride of concentration 28%, then stir 13 minutes;
B. add the ratio of 1.65 kilograms of ammoniacal liquor in the mud obtained to steps A according to 100 kilograms of mud, add the ammoniacal liquor of ammonia content 20% to mud, the potential of hydrogen of adjustment sludge water, makes its pH value be 6, then stirs 20 minutes; Then sludge dehydration device is utilized to carry out extrusion dehydration to mud.
After testing, the water ratio 53% of mud after process, pH value is 7.
The above is only the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, under the prerequisite not departing from the technology of the present invention principle; can also make some improvement and modification, these improve and modification also should be considered as protection scope of the present invention.
Claims (2)
1. a follow-up deep dehydration method for sludge for fertilizer, is characterized in that, comprise the following steps:
A. the preliminary hydro-extraction mud from domestic water of water ratio more than 80% is diluted with water to water ratio 94%, or the mud of water ratio 99.3% in Sewage Plant second pond is concentrated into the mud of water ratio 94% through flocculation and gravity concentration equipment, the ratio of 4.5-6 kilogram of iron trichloride is added according to 100 kilograms of mud, in preliminary hydro-extraction mud, add iron trichloride, then stir 10-15 minute;
B. add the ratio of 1.6-1.7 kilogram of ammoniacal liquor in the mud obtained to steps A according to 100 kilograms of mud, add the ammoniacal liquor of ammonia content 20% to mud, the potential of hydrogen of adjustment sludge water, makes its pH value be 5-6.5, then stirs 10-20 minute; Sludge dehydration device is finally utilized to carry out extrusion dehydration to mud.
2. the follow-up deep dehydration method for sludge for fertilizer according to claim 1, is characterized in that, in steps A, the concentration adding iron trichloride is 28%.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510213734.2A CN104829087A (en) | 2015-04-29 | 2015-04-29 | Deep dehydration method of sludge for fertilizer production in subsequent steps |
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| CN201510213734.2A CN104829087A (en) | 2015-04-29 | 2015-04-29 | Deep dehydration method of sludge for fertilizer production in subsequent steps |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08229600A (en) * | 1994-12-09 | 1996-09-10 | Sankyo Kasei Kogyo Kk | Method for dehydrating organic sludge |
| CN101781139A (en) * | 2010-02-03 | 2010-07-21 | 北京海亚地大生化科技有限公司 | Organic compound fertilizer and preparation method and application thereof |
| JP2013132618A (en) * | 2011-12-27 | 2013-07-08 | Nippon Steel & Sumikin Eco-Tech Corp | Method for biological treatment of organic waste water |
| CN103896474A (en) * | 2014-03-13 | 2014-07-02 | 南京道科环境科技有限公司 | Efficient dehydrating method for sludge |
| CN103896475A (en) * | 2014-03-13 | 2014-07-02 | 南京道科环境科技有限公司 | Regulation method for high-dryness dehydration of sludge |
| CN104003602A (en) * | 2014-06-16 | 2014-08-27 | 周旋辉 | Method for improving dehydration performance of sludge through oxidizing organic matters in sludge |
| CN104098250A (en) * | 2013-12-30 | 2014-10-15 | 北京亿维德曼科技发展有限公司 | Municipal sludge two-stage deep dehydration method combining chemical regulation strengthening preliminary mechanical dehydration and electroosmosis |
-
2015
- 2015-04-29 CN CN201510213734.2A patent/CN104829087A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08229600A (en) * | 1994-12-09 | 1996-09-10 | Sankyo Kasei Kogyo Kk | Method for dehydrating organic sludge |
| CN101781139A (en) * | 2010-02-03 | 2010-07-21 | 北京海亚地大生化科技有限公司 | Organic compound fertilizer and preparation method and application thereof |
| JP2013132618A (en) * | 2011-12-27 | 2013-07-08 | Nippon Steel & Sumikin Eco-Tech Corp | Method for biological treatment of organic waste water |
| CN104098250A (en) * | 2013-12-30 | 2014-10-15 | 北京亿维德曼科技发展有限公司 | Municipal sludge two-stage deep dehydration method combining chemical regulation strengthening preliminary mechanical dehydration and electroosmosis |
| CN103896474A (en) * | 2014-03-13 | 2014-07-02 | 南京道科环境科技有限公司 | Efficient dehydrating method for sludge |
| CN103896475A (en) * | 2014-03-13 | 2014-07-02 | 南京道科环境科技有限公司 | Regulation method for high-dryness dehydration of sludge |
| CN104003602A (en) * | 2014-06-16 | 2014-08-27 | 周旋辉 | Method for improving dehydration performance of sludge through oxidizing organic matters in sludge |
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Application publication date: 20150812 |