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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

Inactive Publication Date: 2021-07-30
XIAMEN UNIV TAN KAH KEE COLLEGE +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Through the related technologies mentioned above, although aerobic fermentation technology can treat river and lake sludge, the fermentation cycle is too long and the fermentation efficiency is low, resulting in high time cost

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] A kind of organic fertilizer that utilizes river and lake dredging silt to make, the concrete components that comprise and weight are as shown in table 2, are made by following steps:

[0043] S1: dewatering and screening the river and lake sludge, and pressing and filtering with a filter press to obtain pretreated river and lake sludge. The moisture content of the pretreated river and lake sludge is 18%;

[0044] S2: Carry out high-temperature sterilization of the treated river and lake sludge in a high-temperature furnace, the sterilization temperature is 150° C., and the sterilization time is 40 minutes to obtain the sterilized river and lake sludge;

[0045] S3: mixing and stirring the sterilized river and lake silt with deionized water, the stirring speed is 800r / min, and after stirring evenly, the river and lake silt with a moisture content of 70% is obtained;

[0046] S4: Mix and stir Bacillus subtilis, Trichoderma, and lactic acid bacteria at a stirring speed of...

Embodiment 2

[0048] Embodiment 2: a kind of organic fertilizer that utilizes river and lake dredging silt to make, and the difference of embodiment 1 is that concrete component and weight are different, and included concrete component and weight are as shown in table 2, comprise the following steps:

[0049] S1: dewatering and screening the river and lake sludge, and pressing and filtering with a filter press to obtain pretreated river and lake sludge. The moisture content of the pretreated river and lake sludge is 18%;

[0050] S2: Carry out high-temperature sterilization of the treated river and lake sludge in a high-temperature furnace, the sterilization temperature is 280° C., and the sterilization time is 20 minutes to obtain the sterilized river and lake sludge;

[0051] S3: mixing and stirring the sterilized river and lake silt with deionized water at a stirring speed of 800r / min, and obtaining river and lake silt with a water content of 80% after stirring evenly;

[0052] S4: Mix asp...

Embodiment 3

[0053] Embodiment 3: a kind of organic fertilizer that utilizes river and lake dredging silt to make, and the difference of embodiment 1 is, the water content of the river and lake silt after pretreatment in step S1 is 10%.

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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.

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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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05G5/12C05G3/80C05F17/20C05F17/40
CPCC05B1/02C05F7/00C05F5/00C05F17/20C05F17/40C05G5/12C05G3/80C05F11/08C05F11/00C05C9/00C05D9/00C05F11/02Y02W30/40
Inventor 金亮冯振
Owner XIAMEN UNIV TAN KAH KEE COLLEGE
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