Method for producing compound organic fertilizer by using municipal sludge

A technology for urban sludge and organic fertilizer, applied in the preparation of organic fertilizer, organic fertilizer, biological organic part treatment, etc., can solve the problems of mildew heavy metals, softening, pollution, etc., and achieve the improvement of heavy metal stability and nutrient balance. Effect

Inactive Publication Date: 2013-12-25
北京沃土天地生物科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method can better solve the problems of softening, mildew and heavy metal pollution in the utilization of sludge resources.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Firstly, municipal sludge (water content of liquid sludge is 95.5%-97.0%, pH 6.5-7.1, rich in organic matter, in terms of dry matter content, the average value of total nitrogen, total phosphorus and total potassium is 4.17% respectively , 1.20%, 0.45%) in the sludge thickening tank, add 1 / 10 of the volume of natural seaweed in the sludge thickening tank as a dehydrating agent for semi-flocculation, and then put it in the dehydration room for dehydration; transfer the dehydrated sludge to The solar concentration and fermentation device is used for conditioning, and the formula ratio is: sludge 60%, urea 7%, potassium chloride 4%, diammonium 1%, sawdust 5%, corn stalk powder 8%, corn cob 7%, so that C / N is 30 / 1, add 3% phosphoric acid neutralization material (dried chicken manure) and 3% heavy metal passivation material (humic acid powder, fly ash, peat soil mixture), and add 5% VT bacteria as The starter is fermented for 6 days, turned over once a day, and kept at a st...

Embodiment 2

[0026] Firstly, municipal sludge (water content of liquid sludge is 95.5%-97.0%, pH 6.5-7.1, rich in organic matter, in terms of dry matter content, the average value of total nitrogen, total phosphorus and total potassium is 4.17% respectively , 1.20%, 0.45%) in the sludge thickening tank, add 1 / 10 of the volume of natural seaweed in the sludge thickening tank as a dehydrating agent for semi-flocculation, and then put it in the dehydration room for dehydration; transfer the dehydrated sludge to The solar concentration and fermentation device is used for conditioning, and the formula ratio is: sludge 60%, urea 7%, potassium chloride 4%, diammonium 1%, sawdust 5%, corn stalk powder 8%, corn cob 7%, so that C / N is 30 / 1, add 3% phosphoric acid neutralization material (dried chicken manure) and 3% heavy metal passivation material (humic acid powder, fly ash, peat soil mixture), and add 5% cyanobacteria-containing (5×10 6 CFU / g), ristocetin (1×10 7 CFU / g), Lactococcus (3×10 6 C...

Embodiment 3

[0028] Firstly, municipal sludge (water content of liquid sludge is 95.5%-97.0%, pH 6.5-7.1, rich in organic matter, in terms of dry matter content, the average value of total nitrogen, total phosphorus and total potassium is 4.17% respectively , 1.20%, 0.45%) in the sludge thickening tank, add 1 / 10 of the volume of natural seaweed in the sludge thickening tank as a dehydrating agent for semi-flocculation, and then put it in the dehydration room for dehydration; transfer the dehydrated sludge to The solar concentration and fermentation device is used for conditioning, and the formula ratio is: sludge 60%, urea 7%, potassium chloride 4%, diammonium 1%, sawdust 5%, corn stalk powder 8%, corn cob 7%, so that C / N is 26 / 1, add 3% phosphoric acid neutralizing material (dried chicken manure) and 3% heavy metal passivation material (humic acid powder, fly ash, peat soil mixture), and add 5% cyanobacteria-containing (5×10 6 CFU / g), ristocetin (1×10 7 CFU / g), Lactococcus (3×10 6 CFU...

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Abstract

The invention provides a method for producing a compound organic fertilizer by using municipal sludge. The method is characterized in that a natural dehydrating agent is used for realizing half-flocculation in stead of the traditionally used polyacrylamide, so that the defect of the formation of insoluble substances in the flocculation process of the municipal sludge can be relieved and toxic and side effects caused by the traditional dehydrating agent can be reduced, a phosphoric acid soluble material and a metal passivated material are added and compound bacteria including photosynthetic bacteria, actinomycetes, lactic acid bacteria, saccharomycetes and bacillus are inoculated as a priming to further soften the sludge and release available nutrients, and finally, the sludge is formed into the finished product of the organic fertilizer in such a manner of drying by turning and spreading or drying in an oven; the manner of forming the finished product is capable of reducing the loss of beneficial bacteria and guaranteeing the quality of the finished product.

Description

technical field [0001] The invention relates to a method for producing organic fertilizer, in particular to a method for producing compound organic fertilizer by using urban sludge. Background technique [0002] Sludge contains a large amount of organic matter, nitrogen, phosphorus and other plant nutrients, among which the content of organic matter is as high as 20%-40%, which is a waste resource with great utilization value. [0003] At present, sludge disposal at home and abroad mainly includes incineration, sanitary landfill, throwing into the sea, and agricultural utilization. However, due to economic and environmental pressures and resource considerations, ocean throwing has been gradually banned; landfilling takes up a lot of land. Permeate is easy to pollute groundwater, and the follow-up management costs are high, and its application is also limited. At present, agricultural use and incineration have become the two main methods of sludge disposal. [0004] Judging ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05F11/08C05F17/00
CPCY02W30/40
Inventor 李季彭生平康文力
Owner 北京沃土天地生物科技股份有限公司
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