Method for preparing granular organic compound fertilizer by using biogas slurry sludge in pig farm

A granular and compound fertilizer technology, applied in application, fertilization equipment, fertilizer mixture, etc., can solve the problems that it is difficult to digest biogas slurry and sludge from pig farms, and enterprises cannot bear it, so as to achieve high application value and market prospect, and improve utilization The effect of high efficiency and porosity

Inactive Publication Date: 2013-01-30
CHANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, this method is only suitable for pig breeding enterprises or farmers with a small amount of sludge, and it is difficult to absorb a large amount of pig farm biogas sludge produced by large and medium-sized pi

Method used

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  • Method for preparing granular organic compound fertilizer by using biogas slurry sludge in pig farm

Examples

Experimental program
Comparison scheme
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Example Embodiment

[0013] Example 1

[0014] Pig farm biogas sludge with a mass of 300kg and a moisture content of 70% is transported by a sludge pump to the decanter discharge sedimentation centrifuge 1, and the rotation speed of the decanter discharge sedimentation centrifuge 1 is 1100 r / min , the centrifugation time is 15min, the water content of the obtained mud cake is 40%, and the separated centrifugate enters the sewage treatment facility. The mud cake after centrifugal dehydration enters in the vertical mixer 3 through the shaftless screw conveyor 2, the rotating speed of the vertical mixer 3 is 30r / min, the mixing time is 5min, and 2.7kg mass fraction is 6% pregelatinized starch added at the same time solution. The dirt cake after stirring, mixing and forming enters the roller extrusion granulator 4 for extrusion granulation, the rotating speed of the roller extrusion granulator 4 is 16r / min, and the prepared particle size is 3-5mm. Granular organic compound fertilizer wet material....

Example Embodiment

[0015] Example 2

[0016] Pig farm biogas sludge with a mass of 500kg and a moisture content of 75% is transported by a sludge pump to the decanter discharge sedimentation centrifuge 1, and the rotation speed of the decanter discharge sedimentation centrifuge 1 is 1200 r / min , the centrifugation time is 12min, the moisture content of the obtained mud cake is 42%, and the separated centrifugate enters the sewage treatment facility. The mud cake after centrifugal dehydration enters the vertical mixer 3 through the shaftless screw conveyor 2. The rotating speed of the vertical mixer 3 is 35r / min, and the stirring time is 6min. solution. The dirt cake after stirring, mixing and forming enters the roller extrusion granulator 4 for extrusion granulation, the rotating speed of the roller extrusion granulator 4 is 16r / min, and the prepared particle size is 3-5mm. Granular organic compound fertilizer wet material. Then the wet material enters the drum dryer 5, the rotating speed o...

Example Embodiment

[0017] Example 3

[0018] Pig farm biogas sludge with a mass of 700kg and a moisture content of 80% is transported by a sludge pump to the decanter discharge sedimentation centrifuge 1, and the rotation speed of the decanter discharge sedimentation centrifuge 1 is 1300 r / min , the centrifugation time is 14min, the moisture content of the obtained mud cake is 44%, and the separated centrifugate enters the sewage treatment facility. The mud cake after centrifugal dehydration enters in the vertical mixer 3 through the shaftless screw conveyor 2, the rotating speed of the vertical mixer 3 is 40r / min, and the mixing time is 7min, and 4.2kg mass fraction is 6% pregelatinized starch added at the same time solution. The dirt cake after stirring, mixing and forming enters the roller extrusion granulator 4 for extrusion granulation, the rotating speed of the roller extrusion granulator 4 is 16r / min, and the prepared particle size is 3-5mm. Granular organic compound fertilizer wet ma...

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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 [0001] The invention belongs to the comprehensive utilization of wastes in the field of environmental protection, and in particular relates to a method for preparing granular organic compound fertilizers from swine farm biogas sludge. Background technique [0002] Pig farm manure wastewater is a kind of organic wastewater rich in nitrogen and phosphorus. In recent years, the pig breeding industry has developed rapidly and its scale has continued to expand, and the ensuing biogas slurry has become more and more harmful to the environment. According to the principle of ammonium magnesium phosphate crystallization method, nitrogen and phosphorus are recovered from the pig farm biogas slurry, and the nitrogen, phosphorus and other suspended organic substances in the biogas slurry are precipitated in the form of sludge rich in nitrogen and phosphorus. The mass fractions of nitrogen and phosphorus nutrients in sludge accounted for about 13.3% and 5.6%, respectivel...

Claims

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Application Information

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IPC IPC(8): C05G3/00
Inventor 张文艺韩有法占明飞戴如娟
Owner CHANGZHOU UNIV
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