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Method for preparing composite slow-release fertilizer by common utilization of biomass and sludge

A biomass and slow-release fertilizer technology, applied in the field of resource utilization of compound slow-release fertilizer, to avoid soil pollution, strong process adaptability and quick effect

Active Publication Date: 2013-07-31
GUANGZHOU INST OF ENERGY CONVERSION - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] None of the above-mentioned patents involves the use of thermochemical treatment of sludge and biomass to produce fertilizers, high-temperature removal of heavy metals in sludge by adding chlorides, and use of high temperature to kill microorganisms and eggs in sludge

Method used

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  • Method for preparing composite slow-release fertilizer by common utilization of biomass and sludge

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] In this example, the method of producing compound slow-release fertilizer by co-utilization of biomass and sludge is as follows, and the flow chart is shown in figure 1 , the process includes the following steps:

[0031](1) The sludge is first dried indirectly with flue gas at 650°C, and then the bulk sludge is crushed, and the evaporated water vapor is mixed with the flue gas and then emptied after being treated by the flue gas purification system;

[0032] (2) The dried sludge is fully and evenly mixed with biomass powder and chloride in a mixing device;

[0033] (3) passing the mixture obtained in step (2) into a reaction furnace for high-temperature incineration, and the high-temperature flue gas produced by incineration is used for sludge drying in step (1);

[0034] (4) The solid product in the step (3) is crushed and sieved to obtain a compound fertilizer.

[0035] The moisture content of the sludge described in step (1) is 74.3%. During the drying process, th...

Embodiment 2

[0043] In this example, the method of producing compound slow-release fertilizer by co-utilization of biomass and sludge is as follows, and the flow chart is shown in figure 1 :

[0044] The sludge with a moisture content of 80% is indirectly dried with flue gas at a temperature of 700°C. During the drying process, the temperature of the sludge is basically maintained at about 170°C, and the drying time is 30 minutes. The moisture content of the sludge after drying is measured to be 16%. . During the drying process, the organic matter in the sludge basically did not decompose, and the high-potential heat value of the obtained dried sludge was 8.9MJ·kg -1 . The dried sludge lumps were mechanically crushed to obtain sludge fragments with an average particle size of about 0.5 cm. The water vapor evaporated during the sludge indirect drying process is mixed with the flue gas, and after being treated by the flue gas purification system, it is discharged to the atmosphere through...

Embodiment 3

[0046] In this example, the method of producing compound slow-release fertilizer by co-utilization of biomass and sludge is as follows, and the flow chart is shown in figure 1 :

[0047] The sludge with a moisture content of 70.8% was indirectly dried with flue gas at a temperature of 500°C. During the drying process, the temperature was basically maintained at about 150°C, and the drying time was 90 minutes. The moisture content of the sludge after drying was measured to be 9%. During the drying process, the organic matter in the sludge basically did not decompose, and the high-level heat value of the obtained dried sludge was 10.3MJ kg -1 . The dried sludge lumps were broken to obtain sludge fragments with an average particle size of about 0.5 cm. The water vapor evaporated during the sludge indirect drying process is mixed with the flue gas and discharged into the atmosphere after being treated by the flue gas purification system. The waste gas treatment process is the sa...

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Abstract

The invention discloses a new method for preparing composite slow-release fertilizer by common utilization of biomass and sludge, which comprises the following steps: drying sludge by high-temperature flue gas, crushing the large block of sludge; uniformly mixing the dried sludge, biomass powder, and chloride, performing high-temperature burning in a reacting furnace, wherein the high temperaturegenerated during burning is used for drying the sludge; crushing and sieving the solid products after burning to obtain the composite fertilizer. The invention can thoroughly kill pathogens and worm eggs in the sludge, removes heavy metal in the sludge, ensures the safety and harmlessness of the finally-prepared composite fertilizer, avoids soil pollution, has strong process adaptability and lesssteps, and is easily amplified.

Description

technical field [0001] The invention relates to the technical field of environmental engineering, in particular to a resource utilization method of using sludge and biomass blending to incinerate heat-generating dry sludge and preparing incinerated solid products into composite slow-release fertilizers. technical background [0002] With the development and progress of society, it is inevitable to produce and discharge a large amount of sewage in daily life. According to statistics released by the Guangdong Provincial Environmental Protection Bureau, by the end of 2008, Guangdong Province had built 176 sewage treatment facilities with a daily treatment capacity of 10.92 million tons, becoming the first province in the country with a daily domestic sewage treatment capacity exceeding 10 million tons. The country's first, in 2008 a total of 3612820000 tons of sewage treatment. As the final product of the sewage treatment process, sludge has a relatively high moisture content ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C05G1/00C05F7/00
CPCY02A40/20
Inventor 武宏香赵增立王小波夏娟娟何方李海滨
Owner GUANGZHOU INST OF ENERGY CONVERSION - CHINESE ACAD OF SCI
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