Method for producing organic fertilizer by use of pretreated sludge

Abstract

The invention provides a method for producing organic fertilizer by use of pretreated sludge. The method comprises the following steps: 1) performing sterilizing treatment on the dewatered sludge for 3 hours under the condition of 121 DEG C; 2) mixing rice husk with the sludge obtained after the high-temperature treatment to obtain a mixture, and then adding a nutrient solution to obtain a mixed material; and 3) adding the sewage from an aeration tank of a municipal sewage plant to the mixed material, regulating the moisture content to 55%, turning over each day, supplementing a proper amount of water until the moisture content is kept within the range of 55-60%, and finishing decomposition 20 days later, thereby obtaining the organic fertilizer. The method has the advantages that the sludge is pretreated at a high temperature before composting so that the flocculent structure and cell membrane structure of the sludge can be broken, and therefore, the cytoplasm in sludge cells flow out to result in great increase in the content of easily degradable organic matters in the compost and to promote efficient fermentation of aerobic composting.

Description

technical field

[0001] The invention relates to the field of organic fertilizer production, in particular to a method for producing organic fertilizer by using pretreated sludge. Background technique

[0002] In recent years, with the development of society and the continuous improvement of people's living standards, urban sewage treatment plants have become more and more popular, and the amount of sludge produced has also increased. Therefore, its treatment and disposal has become an urgent problem to be solved. Composting, as a way to effectively utilize the organic matter in sludge, can convert sludge into organic fertilizer for agricultural production. This method is low in cost and can realize the resource utilization of sludge. However, the sludge from sewage treatment plants After long-term storage and placement, it will turn into black sludge. This sludge has no high temperature period in the process of composting with chaff, and is always in a normal temperature st...

Examples

Embodiment

[0016] A kind of method utilizing pretreatment sludge to produce organic fertilizer, the steps are as follows:

[0017] 1) Put 5kg of dewatered sludge with a water content of 80% into an autoclave and sterilize at 121°C for 3 hours;

[0018] 2) Crush the chaff to a particle size of 90-100 mesh, take 5kg of the chaff with a moisture content of 9% and mix it with the above high-temperature treated sludge to obtain a mixture, then add 1kg of nutrient solution to obtain a mixed material, which is marked as heap Body A, the nutrient solution is a mixed solution of sodium chloride, potassium nitrate, magnesium sulfate, ferrous sulfate, manganese sulfate and zinc sulfate dissolved in deionized water, sodium chloride, potassium nitrate, magnesium sulfate, sulfuric acid The mass ratio of ferrous iron, manganese sulfate and zinc sulfate is 2:1:1:1:1:1, and the concentration of sodium chloride in the mixed solution is 80g / L;

[0019] 3) Add sewage from the aeration tank of the urban sew...

technical field

[0001] The invention relates to the field of organic fertilizer production, in particular to a method for producing organic fertilizer by using pretreated sludge. Background technique

[0002] In recent years, with the development of society and the continuous improvement of people's living standards, urban sewage treatment plants have become more and more popular, and the amount of sludge produced has also increased. Therefore, its treatment and disposal has become an urgent problem to be solved. Composting, as a way to effectively utilize the organic matter in sludge, can convert sludge into organic fertilizer for agricultural production. This method is low in cost and can realize the resource utilization of sludge. However, the sludge from sewage treatment plants After long-term storage and placement, it will turn into black sludge. This sludge has no high temperature period in the process of composting with chaff, and is always in a normal temperature st...

Examples

Embodiment

[0016] A kind of method utilizing pretreatment sludge to produce organic fertilizer, the steps are as follows:

[0017] 1) Put 5kg of dewatered sludge with a water content of 80% into an autoclave and sterilize at 121°C for 3 hours;

[0018] 2) Crush the chaff to a particle size of 90-100 mesh, take 5kg of the chaff with a moisture content of 9% and mix it with the above high-temperature treated sludge to obtain a mixture, then add 1kg of nutrient solution to obtain a mixed material, which is marked as heap Body A, the nutrient solution is a mixed solution of sodium chloride, potassium nitrate, magnesium sulfate, ferrous sulfate, manganese sulfate and zinc sulfate dissolved in deionized water, sodium chloride, potassium nitrate, magnesium sulfate, sulfuric acid The mass ratio of ferrous iron, manganese sulfate and zinc sulfate is 2:1:1:1:1:1, and the concentration of sodium chloride in the mixed solution is 80g / L;

[0019] 3) Add sewage from the aeration tank of the urban sew...

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