CN102898233A - Method for preparing granular organic compound fertilizer by using biogas slurry sludge in pig farm - Google Patents
Method for preparing granular organic compound fertilizer by using biogas slurry sludge in pig farm Download PDFInfo
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- CN102898233A CN102898233A CN2012103858886A CN201210385888A CN102898233A CN 102898233 A CN102898233 A CN 102898233A CN 2012103858886 A CN2012103858886 A CN 2012103858886A CN 201210385888 A CN201210385888 A CN 201210385888A CN 102898233 A CN102898233 A CN 102898233A
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Abstract
The invention relates to a method for preparing a granular organic compound fertilizer by using biogas slurry sludge in a pig farm. The method comprises the following steps that: the biogas slurry sludge is pumped to a horizontal spiral shell unloading sedimentation centrifugal machine by a sludge pump for centrifugal dewatering, centrifugate after the centrifugal dewatering enters a sewage treatment facility, mud cakes after the centrifugal dewatering are conveyed to a vertical paddle mixer for mixing through a shaftless screw conveyor, simultaneously a pregelatinized starch solution is added, sludge cakes after being mixed enter a roller extrusion type pelletizer for pelleting, wet feed of the granular organic compound fertilizer is obtained, and then enters a rotary drum drying machine for drying, particles after being dried are screened to obtain the granular organic compound fertilizer. In a process of organic fertilizer manufacture, sludge produced in a biogas slurry nitrogen phosphorus recovery process does not contain harmful microorganisms and parasites, and anaerobic digestion treatment on the granular organic compound fertilizer is not needed. In addition, nitrogen, phosphorus, organic matters and other mineral contents are high, a nitrogen-phosphorus-potassium chemical fertilizer and organic biomass are not needed, and the cost is low.
Description
Technical field
The invention belongs to the waste ' s reclamation of field of Environment Protection, be specifically related to a kind of method of utilizing natural pond, pig farm liquid mud to prepare the particulate state compoiste fertilizer.
Background technology
The pig farm excrement and urine water is a kind of organic waste water of rich Nitrogen-and Phosphorus-containing.In recent years, pig-breeding already develops rapidly, and scale constantly enlarges, and the natural pond liquid that thereupon produces is also more and more serious to the harm that environment causes.According to ammoniomagnesium phosphate crystal method principle, natural pond, pig farm liquid is carried out nitrogen, phosphorus recovery, nitrogen, phosphorus and other suspended organic matter matter in the liquid of natural pond are to be rich in the sludge form precipitation of nitrogen, phosphorus.The massfraction of nitrogen, phosphorus nutrient accounts for respectively 13.3%, 5.6% in the mud.These precipitating sludges not only are rich in nitrogen, phosphorus, and organism and content of mineral substances are also higher, if give it up or utilize improperly, will certainly cause the wasting of resources and secondary environmental pollution.
At present, natural pond, pig farm fluid dewatering mud mainly contains two kinds of disposal options: the first is given plantation family, field and is also used in the field, needs certain trucking costs.Agricultural planting has seasonality in addition, and plantation family in soil also is subjected to the impact in season larger on the demand of mud, general summer and autumn demand large, the winter-spring season demand is little.Therefore this method only is suitable for the little health pig of disposing sludge generation and grows enterprise or peasant household, and natural pond, a large amount of pig farm liquid mud that the big-and-middle-sized pig-breeding enterprise that is difficult to dissolve produces; It two is to deliver to refuse landfill to carry out landfill and dispose, and needs transportation and the landfill expense of the certain number of payment, and general enterprises is difficult to bear.If natural pond, pig farm fluid dewatering mud is made farming, woods, animal husbandry compoiste fertilizer, not only can realize effective disposal of mud, can also bring extra economic return for enterprise.
Natural pond, pig farm fluid dewatering mud is made in the fertilizer process, because the objectionable impurities that natural pond, pig farm liquid contains is eliminated through anaerobically fermenting, the mud that produces in the liquid nitrogen phosphorus removal process of natural pond no longer contains harmful microorganism and parasite, do not need again it to be carried out anaerobically fermenting and process, therefore can directly carry out composting.In addition, nitrogen, phosphorus, organic matter and other content of mineral substances are higher in the mud, also do not need in the composting process to add nitrogen phosphorus potassium chemical fertilizer and organic-biological matter again, and the composting cost is lower.
Summary of the invention
The purpose of this invention is to provide a kind of method of utilizing natural pond, pig farm liquid mud to prepare the particle compoiste fertilizer.
Cardinal principle of the present invention and technical scheme are as follows:
Natural pond liquid mud is delivered to sleeping spiral shell discharging sedimentation centrifuge through sludge pump and carries out centrifuge dehydration, centrifugate after centrifuge dehydration enters sewage treatment facility, mud cake after the centrifuge dehydration is delivered to post-type mixer by Shaftless screw conveyor and stirs, add simultaneously pre-gelatinized starch solution, pre-gelatinized starch solution dosage is relevant with the dirty cake water ratio after the dehydration.For water ratio be 40%, quality is the dehydrated sludge cake of 100kg, the add-on of pre-gelatinized starch solution is 1.8kg.Dirty cake after the stirring enters pair roller extruding type tablets press and carries out granulation, obtains particulate state compoiste fertilizer wet feed, and wet feed enters whizzer and carries out drying subsequently, and dried particle is particulate state organic composite fertilizer product through screening.Above-mentioned each inter process that adopts is linked in sequence, and can realize in batches, work continuously, and production efficiency is higher.
The present invention with starch as moulding, matrix material, mainly be utilize its binding property that has strong, be easy to moulding, water insoluble, water absorbability is little, the advantage such as cheap and easy to get, it is prepared forming agent and the binding agent of granulated fertilizer as natural pond liquid mud, not only help to prepare particulate state fertilizer, and can not bring any variation to the soil soil property of using, can not bring any pollution to growth and the environment of plant yet.
When the prepared this particulate state organic composite fertilizer of the present invention is used as cave-applied fertilizer, with general chemical composite fertilizer such as potassium primary phosphate, monoammonium phosphate, diammonium phosphate is compared, owing to adopting starch as binding agent, has physical strength large, be difficult for broken, water insoluble, the characteristics such as water absorbability is little, so that fertilizer particulate state after the maintenance water-swelling of energy long period in the wetland environment, thereby guaranteed that its contained nutrient can not concentrate release in the short period of time, but slowly be discharged in the soil, play slow releasing function, having reduced the nutrient in the fertilizer scatters and disappears or runs off, thereby can keep fertilizer efficiency, make the fertilizer efficiency of fertilizer longer action time; Also owing to organic content in the fertilizer is high, porosity is large simultaneously, and root system of plant can directly absorb nutrient in the deep enough granulated fertilizer gap, has greatly improved the utilising efficiency of nutrient.Therefore, the prepared particulate state organic composite fertilizer of the present invention has higher using value and market outlook in agricultural, forestry and animal husbandry plantation.
Description of drawings
Fig. 1 is process flow diagram of the present invention.
Among the figure: 1-sleeping spiral shell discharging sedimentation centrifuge; 2-Shaftless screw conveyor; 3-post-type mixer; 4-pair roller extruding type tablets press; 5-whizzer; 6-cylinder round sifter.
Embodiment
As shown in Figure 1, quality is that 300～1000kg, water ratio are 94%～98% natural pond, pig farm liquid mud, be delivered in the sleeping spiral shell discharging sedimentation centrifuge 1 through sludge pump, the rotating speed of sleeping spiral shell discharging sedimentation centrifuge 1 is 1100～1500 r/min, centrifugation time is 15～20min, the gained moisture content of the cake is 40%～48%, and the centrifugate of separating enters sewage treatment facility.Mud cake after centrifuge dehydration enters in the post-type mixer 3 by Shaftless screw conveyor 2, the rotating speed of post-type mixer 3 is 30～40r/min, churning time is 5～10min, the massfraction that adds simultaneously 2.7～4.59kg is 6% pre-gelatinized starch solution, and pre-gelatinized starch solution dosage is relevant with the dirty cake water ratio after the dehydration.For water ratio be 40%, quality is the dehydrated sludge cake of 100kg, the add-on of pre-gelatinized starch solution is 1.8kg.Dirty cake after stirring, mixing, moulding enters pair roller extruding type tablets press 4 and carries out extruder grain, and the rotating speed of pair roller extruding type tablets press 4 is 16r/min, and preparing particle diameter is the particulate state compoiste fertilizer wet feed of 3～5mm.Wet feed enters whizzer 5 subsequently, and the rotating speed of whizzer 5 is 4.7r/min, and be 15～20min time of drying.Dried particle is through cylinder round sifter 6 screening, and the sieve screen apertures of cylinder round sifter 6 namely gets particulate state organic composite fertilizer product through being 3mm after the screening, and the powder after the screening returns that post-type mixer stirs again, granulation.
Embodiment 1
Be that 300kg, water ratio are 70% natural pond, pig farm liquid mud with quality, be delivered in the sleeping spiral shell discharging sedimentation centrifuge 1 through sludge pump, the rotating speed of sleeping spiral shell discharging sedimentation centrifuge 1 is 1100 r/min, centrifugation time is 15min, the gained moisture content of the cake is 40%, and the centrifugate of separating enters sewage treatment facility.Mud cake after centrifuge dehydration enters in the post-type mixer 3 by shaftless spiral conveyer 2, and the rotating speed of post-type mixer 3 is 30r/min, and churning time is 5min, and adding simultaneously the 2.7kg massfraction is 6% pre-gelatinized starch solution.Dirty cake after stirring, mixing, the moulding enters pair roller extruding type tablets press 4 and carries out extruder grain, and the rotating speed of pair roller extruding type tablets press 4 is 16r/min, and preparing particle diameter is the particulate state compoiste fertilizer wet feed of 3～5mm.Wet feed enters whizzer 5 subsequently, and the rotating speed of whizzer 5 is 4.7r/min, and be 15min time of drying.Dried particle is through cylinder round sifter 6 screening, and the sieve screen apertures of cylinder round sifter 6 namely gets particulate state organic composite fertilizer product through being 3mm after the screening, and the powder after the screening returns that post-type mixer stirs again, granulation.
Embodiment 2
Be that 500kg, water ratio are 75% natural pond, pig farm liquid mud with quality, be delivered in the sleeping spiral shell discharging sedimentation centrifuge 1 through sludge pump, the rotating speed of sleeping spiral shell discharging sedimentation centrifuge 1 is 1200 r/min, centrifugation time is 12min, the gained moisture content of the cake is 42%, and the centrifugate of separating enters sewage treatment facility.Mud cake after centrifuge dehydration enters in the post-type mixer 3 by shaftless spiral conveyer 2, and the rotating speed of post-type mixer 3 is 35r/min, and churning time is 6min, and adding simultaneously the 3.75kg massfraction is 6% pre-gelatinized starch solution.Dirty cake after stirring, mixing, the moulding enters pair roller extruding type tablets press 4 and carries out extruder grain, and the rotating speed of pair roller extruding type tablets press 4 is 16r/min, and preparing particle diameter is the particulate state compoiste fertilizer wet feed of 3～5mm.Wet feed enters whizzer 5 subsequently, and the rotating speed of whizzer 5 is 4.7r/min, and be 8min time of drying.Dried particle is through cylinder round sifter 6 screening, and the sieve screen apertures of cylinder round sifter 6 namely gets particulate state organic composite fertilizer product through being 3mm after the screening, and the powder after the screening returns that post-type mixer stirs again, granulation.
Embodiment 3
Be that 700kg, water ratio are 80% natural pond, pig farm liquid mud with quality, be delivered in the sleeping spiral shell discharging sedimentation centrifuge 1 through sludge pump, the rotating speed of sleeping spiral shell discharging sedimentation centrifuge 1 is 1300 r/min, centrifugation time is 14min, the gained moisture content of the cake is 44%, and the centrifugate of separating enters sewage treatment facility.Mud cake after centrifuge dehydration enters in the post-type mixer 3 by shaftless spiral conveyer 2, and the rotating speed of post-type mixer 3 is 40r/min, and churning time is 7min, and adding simultaneously the 4.2kg massfraction is 6% pre-gelatinized starch solution.Dirty cake after stirring, mixing, the moulding enters pair roller extruding type tablets press 4 and carries out extruder grain, and the rotating speed of pair roller extruding type tablets press 4 is 16r/min, and preparing particle diameter is the particulate state compoiste fertilizer wet feed of 3～5mm.Wet feed enters whizzer 5 subsequently, and the rotating speed of whizzer 5 is 4.7r/min, and be 10min time of drying.Dried particle is through cylinder round sifter 6 screening, and the sieve screen apertures of cylinder round sifter 6 namely gets particulate state organic composite fertilizer product through being 3mm after the screening, and the powder after the screening returns that post-type mixer stirs again, granulation.
Embodiment 4
Be that 850kg, water ratio are 82% natural pond, pig farm liquid mud with quality, be delivered in the sleeping spiral shell discharging sedimentation centrifuge 1 through sludge pump, the rotating speed of sleeping spiral shell discharging sedimentation centrifuge 1 is 1400 r/min, centrifugation time is 16min, the gained moisture content of the cake is 46%, and the centrifugate of separating enters sewage treatment facility.Mud cake after centrifuge dehydration enters in the post-type mixer 3 by shaftless spiral conveyer 2, and the rotating speed of post-type mixer 3 is 45r/min, and churning time is 8min, and adding simultaneously the 4.59kg massfraction is 6% pre-gelatinized starch solution.Dirty cake after stirring, mixing, the moulding enters pair roller extruding type tablets press 4 and carries out extruder grain, and the rotating speed of pair roller extruding type tablets press 4 is 16r/min, and preparing particle diameter is the particulate state compoiste fertilizer wet feed of 3～5mm.Wet feed enters whizzer 5 subsequently, and the rotating speed of whizzer 5 is 4.7r/min, and be 12min time of drying.Dried particle is through cylinder round sifter 6 screening, and the sieve screen apertures of cylinder round sifter 6 namely gets particulate state organic composite fertilizer product through being 3mm after the screening, and the powder after the screening returns that post-type mixer stirs again, granulation.
Embodiment 5
Be that 1000kg, water ratio are 85% natural pond, pig farm liquid mud with quality, be delivered in the sleeping spiral shell discharging sedimentation centrifuge 1 through sludge pump, the rotating speed of sleeping spiral shell discharging sedimentation centrifuge 1 is 1500 r/min, centrifugation time is 20min, the gained moisture content of the cake is 48%, and the centrifugate of separating enters sewage treatment facility.Mud cake after centrifuge dehydration enters in the post-type mixer 3 by shaftless spiral conveyer 2, and the rotating speed of post-type mixer 3 is 50r/min, and churning time is 10min, and adding simultaneously the 4.5kg massfraction is 6% pre-gelatinized starch solution.Dirty cake after stirring, mixing, the moulding enters pair roller extruding type tablets press 4 and carries out extruder grain, and the rotating speed of pair roller extruding type tablets press 4 is 16r/min, and preparing particle diameter is the particulate state compoiste fertilizer wet feed of 3～5mm.Wet feed enters whizzer 5 subsequently, and the rotating speed of whizzer 5 is 4.7r/min, and be 14min time of drying.Dried particle is through cylinder round sifter 6 screening, and the sieve screen apertures of cylinder round sifter 6 namely gets particulate state organic composite fertilizer product through being 3mm after the screening, and the powder after the screening returns that post-type mixer stirs again, granulation.
Claims (2)
1. method of utilizing natural pond, pig farm liquid mud to prepare the particulate state compoiste fertilizer; it is characterized in that; natural pond liquid mud is delivered to sleeping spiral shell discharging sedimentation centrifuge through sludge pump and carries out centrifuge dehydration; centrifugate after centrifuge dehydration enters sewage treatment facility; mud cake after the centrifuge dehydration is delivered to post-type mixer by Shaftless screw conveyor and stirs; add simultaneously pre-gelatinized starch solution; dirty cake after the stirring enters pair roller extruding type tablets press and carries out granulation; obtain particulate state compoiste fertilizer wet feed; wet feed enters whizzer and carries out drying subsequently, and dried particle is particulate state organic composite fertilizer product through screening.
2. method according to claim 1 is characterized in that, adding massfraction is 6% pre-gelatinized starch solution.
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| CN2012103858886A CN102898233A (en) | 2012-10-12 | 2012-10-12 | Method for preparing granular organic compound fertilizer by using biogas slurry sludge in pig farm |
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| CN2012103858886A CN102898233A (en) | 2012-10-12 | 2012-10-12 | Method for preparing granular organic compound fertilizer by using biogas slurry sludge in pig farm |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104649763A (en) * | 2015-03-03 | 2015-05-27 | 徐州工程学院 | Anaerobic treatment method of excreta in intensive cattle farm |
Citations (8)
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|---|---|---|---|---|
| FR2117809A1 (en) * | 1970-12-14 | 1972-07-28 | Gauthier Andre | Natural manure granules - by dehydration of cow manure |
| CN1055729A (en) * | 1990-08-14 | 1991-10-30 | 甘肃力耕应用科学技术研究所 | The fertile method of urban night soil suitability for industrialized production farming |
| CN1097724A (en) * | 1994-06-08 | 1995-01-25 | 姚广忠 | The method of utilizing municipal sludge, ight soil to produce highly efficient granular organic fertilizer |
| CN1135471A (en) * | 1995-12-29 | 1996-11-13 | 洛滨 | Birds organic muck |
| JP2001129600A (en) * | 1999-11-02 | 2001-05-15 | Kubota Corp | Fermented sludge treatment method |
| CN101734964A (en) * | 2008-11-26 | 2010-06-16 | 四川鹤岛农业科技有限公司 | Preparation of microorganism organic fertilizer from methane residue |
| CN101774848A (en) * | 2010-01-18 | 2010-07-14 | 山东省农业科学院土壤肥料研究所 | Biogas residue organic fertilizer and preparation method thereof |
| CN102167650A (en) * | 2011-01-27 | 2011-08-31 | 西南科技大学 | Preparation method of gypsum-based urea gypsum-urea-ammonium sulphate controlled-release nitrogen fertilizers |
-
2012
- 2012-10-12 CN CN2012103858886A patent/CN102898233A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2117809A1 (en) * | 1970-12-14 | 1972-07-28 | Gauthier Andre | Natural manure granules - by dehydration of cow manure |
| CN1055729A (en) * | 1990-08-14 | 1991-10-30 | 甘肃力耕应用科学技术研究所 | The fertile method of urban night soil suitability for industrialized production farming |
| CN1097724A (en) * | 1994-06-08 | 1995-01-25 | 姚广忠 | The method of utilizing municipal sludge, ight soil to produce highly efficient granular organic fertilizer |
| CN1135471A (en) * | 1995-12-29 | 1996-11-13 | 洛滨 | Birds organic muck |
| JP2001129600A (en) * | 1999-11-02 | 2001-05-15 | Kubota Corp | Fermented sludge treatment method |
| CN101734964A (en) * | 2008-11-26 | 2010-06-16 | 四川鹤岛农业科技有限公司 | Preparation of microorganism organic fertilizer from methane residue |
| CN101774848A (en) * | 2010-01-18 | 2010-07-14 | 山东省农业科学院土壤肥料研究所 | Biogas residue organic fertilizer and preparation method thereof |
| CN102167650A (en) * | 2011-01-27 | 2011-08-31 | 西南科技大学 | Preparation method of gypsum-based urea gypsum-urea-ammonium sulphate controlled-release nitrogen fertilizers |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104649763A (en) * | 2015-03-03 | 2015-05-27 | 徐州工程学院 | Anaerobic treatment method of excreta in intensive cattle farm |
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Application publication date: 20130130 |