Method for preparing organic fertilizer by utilizing dredged sludge of rivers and lakes

A technology for dredging sludge and organic fertilizer, which is applied in the fields of organic fertilizer, sewage/sludge fertilizer, biological organic part treatment, etc., can solve the problems of long fermentation period, low fermentation efficiency and high time cost
CN113185370AInactive Publication Date: 2021-07-30XIAMEN UNIV TAN KAH KEE COLLEGE +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
XIAMEN UNIV TAN KAH KEE COLLEGE
Publication Date
2021-07-30
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention relates to the technical field of sludge treatment, and particularly discloses a method for preparing an organic fertilizer by utilizing dredged sludge of rivers and lakes. The method comprises the following steps: carrying out dehydration screening and filter pressing treatment on 75-80 parts by weight of river and lake sludge to obtain pretreated river and lake sludge; subjecting the treated river and lake sludge to high-temperature sterilization at a sterilization temperature of 150-280 DEG C for 20-40 min so as to obtain sterilized river and lake sludge; uniformly mixing the sterilized river and lake sludge with deionized water to obtain river and lake sludge with the water content of 70-80%; mixing river and lake sludge with the water content of 70-80% with a leavening agent at the temperature of 50-60 DEG C, and performing fermentation for 2-3 days after uniform mixing so as to obtain a fermented organic fertilizer bulk material, wherein the addition amount of the leavening agent is 0.1-0.3% of the weight of the sludge; and granulating the fermented organic fertilizer bulk material, and performing drying to obtain an organic fertilizer particle finished product. The organic fertilizer provided by the invention has the advantage of high fermentation efficiency.
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Description

technical field

[0001] The present application relates to the technical field of sludge treatment, in particular to a method for making organic fertilizer from river and lake dredging sludge. Background technique

[0002] River and lake silt is deposited in still water or slow flowing water environment and formed by physical and chemical actions. At present, most of the urban rivers and lakes are seriously silted up. In order to maintain the smooth transportation of the river, it is usually necessary to dredge the river and lake silt; and the large amount of river and lake dredging silt produced by dredging rivers and lakes contains more pollution due to the long-term discharge of sewage It has the characteristics of high moisture content, low strength, poor permeability, and heavy odor. It cannot handle river and lake dredging silt well, and it is difficult to redevelop and utilize it.

[0003] With the development of science and technology, people gradually decompose the ...

Claims

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