Method for preparation of biogas and combined production of organic fertilizer through processing peat by dilute acid

An organic fertilizer and dilute acid technology, which is applied in the preparation of organic fertilizers, the processing of organic fertilizers and peat, etc., can solve problems such as pollution accumulation, achieve mild reaction conditions, facilitate diversification, and expand product types.

Inactive Publication Date: 2013-09-04
INNER MONGOLIA UNIV OF SCI & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, my country's agricultural production mainly uses chemical fertilizers, and its utilization rate is only about 30%, and the remaining 70% is either leached or released, resulting in the accumulation of pollution year after year
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Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Example 1: Take dried peat and crush it to 10 mesh, collect 10 g of peat fine powder, add 3 times the volume of 2% dilute sulfuric acid, hydrolyze at 90°C for 2 hours, add barium hydroxide to adjust the pH to 7.5, add urea to adjust the carbon-nitrogen ratio 25:1, add 30% activated sludge, ferment at 50°C for 13 days to collect 61ml of biogas by drainage and gas collection method, and measure the methane content in the biogas to be 60%. After adding slaked lime to the fermentation residue to adjust the pH to 7.5, add cow dung with a mass fraction of 40% of the residue and a water content of 60% covered with plastic film for anaerobic stacking and fermentation for 30 days, then granulate and dry at 55°C to obtain an organic fertilizer. The organic fertilizer contains Organic matter (dry basis) 46%, total nutrient (dry basis) 5.7%, moisture 24%, pH7.0, As, Cd, Pb, Cr, Hg content indicators meet the requirements of 4.3 in NY 525-2012, detection of fecal coliform The number...

Embodiment 2

[0020] Example 2: Take dry peat and grind it to 10 mesh, collect 30g of peat fine powder, add 2 times the volume of 3% dilute sulfuric acid, hydrolyze at 95°C for 1 hour, add soda ash to adjust the pH to 7.5, add urea to adjust the carbon-nitrogen ratio to 25 :1, adding 25% activated sludge by volume fraction, fermented at 50°C for 10 days to collect 157ml of biogas by drainage and gas collection method, and measured the methane content in the biogas to be 58%. After adding slaked lime to the fermentation residue to adjust the pH to 7.5, add cow dung with a mass fraction of 35% of the residue and a water content of 50% to cover the plastic film and stack it anaerobically for 7 days, then ferment naturally for 20 days, granulate and dry at 55°C to obtain organic fertilizer , the organic fertilizer contains 47% of organic matter (dry basis), 5.4% of total nutrients (dry basis), 25% of moisture, pH6.4, As, Cd, Pb, Cr, Hg content indicators meet the requirements of 4.3 in NY 525-20...

Embodiment 3

[0021] Example 3: Take dried peat and crush it to 20 mesh, collect 20 g of peat fine powder, add 1.5 times the volume of 2% dilute hydrochloric acid, hydrolyze at 95°C for 2 hours, add sodium hydroxide to adjust the pH to 7.5, add urea to adjust the carbon-nitrogen ratio 30:1, add 30% activated sludge, ferment at 50°C for 15 days to collect 89ml of biogas by drainage and gas collection method, and measure the methane content in the biogas to be 62%. After adding slaked lime to the fermentation residue to adjust the pH to 7.5, add cow dung with a mass fraction of 40% of the residue and a water content of 70% and pile it up for 15 days, then cover it with a plastic film for anaerobic fermentation for 15 days, granulate and dry at 50°C to obtain an organic fertilizer. The organic fertilizer contains 47% of organic matter (dry basis), 5.1% of total nutrients (dry basis), 28% of moisture, pH6.2, As, Cd, Pb, Cr, and Hg content indicators meet the requirements of 4.3 in NY 525-2012. ...

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Abstract

The present invention refers to 3D rotational X-ray imaging systems for use in computed tomography (CT) and a fast, accurate and mathematically robust calibration method for determining the effective center of rotation (I) in not perfectly isocentric 3D rotational C-arm systems and eliminating substantially circular ring artifacts (RA) which arise when using such a CT scanner system. For this purpose, a C-arm based rotational CT scanner comprising at least one radiation detector (D) having an X-radiation sensitive surface exposed to an X-ray beam emitted by at least one X-ray tube (S), each rotating along a non-ideal circular trajectory (TF, TCD) about an object of interest to be three-dimensionally reconstructed from a set of 2D projection images is used for providing geometrical calibration data by scanning a calibration phantom from a plurality of distinct projection directions and calculating, for each projection direction, the 3D positions of the X-ray tube's focal spot and the X-ray detector's center. For approximating the exact 3D position and angular direction of the axis of rotation about which the at least one X-ray tube and the at least one radiation detector rotate, a circular regression technique using a number of mathematically robust least squares fits is applied.

Description

technical field [0001] The invention belongs to the application field of peat resource utilization, and in particular relates to a method for preparing biogas and organic fertilizer by treating peat with dilute acid. Background technique [0002] Peat, also known as peat or grass carbon, is the coal with the lowest degree of coalification. Because of its unique and superior physical, chemical and biological properties, and low price, peat is widely used in various fields such as agriculture, horticulture, construction, industry, and medicine. Although China is only at the initial stage of peat application, people have gradually realized that peat has unique and irreplaceable properties of other materials, such as light weight, water retention, breathability and rich in organic matter. At present, peat has been used in urban greening construction, nutrient soil for flower gardens, sports fields or golf courses, potted flowers, soil improvement, desert greening, soilless cult...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10F7/02C05F15/00C05F17/00
CPCY02E50/30Y02W30/40
Inventor 李珺马力通蔡禄赫文秀赵果荣
Owner INNER MONGOLIA UNIV OF SCI & TECH
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