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Process and apparatus for treating manure sludge

A sludge and manure technology, applied in agriculture and separation fields, can solve problems such as high phosphorus content limitation, and achieve the effects of reducing compaction, less manure storage, and accurate delivery of specific nutrients

Inactive Publication Date: 2019-04-26
VALIO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Spreading manure sludge on the site is currently limited by the high phosphorus content of the manure

Method used

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  • Process and apparatus for treating manure sludge
  • Process and apparatus for treating manure sludge
  • Process and apparatus for treating manure sludge

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0081] Process 1000 m of dry matter (DM) content of 8% by weight with a screw press (EYS SP600, mesh size: 0.5 mm) 3 Well mixed liquid cow manure sludge, which produced two fractions: 250 metric tons of dry fraction ("1st dry fraction"; 23% by weight DM) and 750 mt 3 Liquid fraction (3% by weight of DM).

[0082] The liquid fraction was pumped to a decanter centrifuge (Andritz Separation, model D5L, bowl speed: 3200 rpm, differential speed: 3.9 rpm, torque: 55 wt%, cell depth: 272 mm), which further removed suspended solids. Processing in a decanter centrifuge produced two fractions: 760m 3 Liquid fraction and 85 metric tons dry fraction ("2nd Dry Fraction"). After centrifugation, the dry matter contents of the liquid and dry fractions were <1% by weight and 18% by weight, respectively.

[0083] After centrifugation, the liquid fraction was pumped through a metal sieve with a mesh size of 80 μm to remove the largest particles.

[0084] After screening, the resulting liquid...

Embodiment 2

[0090] With a decanter centrifuge (Andritz Separation, D5L type, drum speed: 3200rpm, differential speed: 10rpm, torque: 70wt%, pool depth: 272mm) processing dry matter (DM) content is 1000m of 8% by weight. 3 Well-mixed liquid cow manure sludge, which produced two fractions: 225 metric tons of dry fraction ("1st dry fraction"; DM was 25% by weight) and 775 mt 3 Liquid fraction (3% by weight of DM).

[0091] The liquid fraction was pumped to a decanter centrifuge (Andritz Separation, model D5L, bowl speed: 3200 rpm, differential speed: 3.9 rpm, torque: 55 wt%, cell depth: 272 mm), which further removed suspended solids. Processing in decanter centrifuge produced dry and liquid fractions: 695m 3 Liquid fraction and 80 metric tons of dry fraction ("2nd dry fraction"). After centrifugation, the dry matter contents of the liquid and dry fractions were 0.5% by weight and 25% by weight, respectively.

[0092] Liquid from centrifugation was pumped to a reverse osmosis (RO) facilit...

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Abstract

The invention relates to a method for treating manure sludge comprising the steps of: providing manure sludge; subjecting the manure sludge to separation to provide a first dry fraction and a first liquid fraction; subjecting the first liquid fraction to a centrifugation step to provide a second dry fraction and a second liquid fraction; subjecting the second liquid fraction to one or more sequential reverse osmosis (RO) filtration steps to provide one or more RO retentates and one or more RO permeates, wherein the feed for each subsequent RO filtration step is an RO permeate obtained from theprevious RO filtration step.

Description

technical field [0001] The present invention relates to agriculture and separation techniques. More specifically, the present invention relates to the treatment of manure sludge by means of separation techniques. Background technique [0002] Today's milk production and animal husbandry is highly centralized. Therefore, the scale of animal farms is increasing, and a large amount of manure sludge is generated on site. Large manure sludge volumes lead to logistical problems, since the manure has to be spread over a large site area in a short time. The manure then has to be transported long distances, which incurs costs. Furthermore, a huge investment is required in spreading equipment. As animal farms increase in size, rationalization of manure sludge disposal is more important than ever. The size of the existing manure sludge container is about 1000m 3 to 8000m 3 , which means that there is a great need for dewatering or thickening of manure sludge. [0003] Spreading...

Claims

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Application Information

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IPC IPC(8): C05F7/00C02F1/44C02F9/00C05F3/00
CPCC02F1/441C05F3/00C05F7/00C02F9/00Y02P20/145C02F1/385C02F1/52C02F11/04C02F2101/105C02F2101/16C02F2103/20C02F2201/008C02F2301/08Y02A40/20C02F1/38C05F3/06
Inventor A-P·帕尔托宁A·海诺哈利·卡里奥宁
Owner VALIO LTD
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