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Method of producing composite organic fertilizer using city sludge

A technology of urban sludge and organic fertilizer, applied in the preparation of organic fertilizer, organic fertilizer, sewage/sludge fertilizer, etc., can solve the problems of pollution, softening, mildew heavy metals, etc., to reduce toxicity and reduce sludge output Effect

Inactive Publication Date: 2003-09-17
李波 +1
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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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  • Method of producing composite organic fertilizer using city sludge
  • Method of producing composite organic fertilizer using city sludge

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Embodiment 1, prepare three-dimensional compound fertilizer:

[0026] For its preparation process, please refer to figure 1 , the solid line in the figure represents the flow of this embodiment. First, filter and settle the urban sewage, take the settled sludge into the thickening tank, add natural seaweed as a dehydrating agent according to the proportion of 10% of the thickening tank volume, make the sludge semi-flocculated, and dehydrate it in the dehydration machine room, and the dehydrated sewage The mud is sent to the solar concentration fermentation device for conditioning, and its formula ratio is: sludge 50-60%, urea 5-10%, potassium chloride 2-5%, diammonium 1%, pine needle powder 5%, alfalfa powder 3 %, straw powder 8%, other 8-26%, make C / N=30 / 1, add 3% phosphoric acid neutralizing material (for drying chicken manure, pig manure or cow manure) and 3% heavy metal passivation material (for humic acid powder, fly ash, peat soil, etc.), and add 5% of fertile s...

Embodiment 2

[0028] Embodiment 2, prepare high-efficiency nutrient soil:

[0029] see figure 1 Shown by the dotted line. Its operating conditions are the same as in Example 1, and the difference from Example 1 is that the conditioned compost is conditioned again to make C / N=25 / 1, and 5% of fertile soil is added to carry out secondary fermentation as a primer. The pile temperature is ≥55°C, and the time is more than 3 days, and then the pile is turned or dried to make the moisture ≤18%, and then crushed to make nutrient soil. Its total nitrogen, phosphorus and potassium nutrients are ≥2%, organic matter is ≥38%, and the number of viable VT bacteria is ≥1×10 7 .

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Abstract

A process for preparing compound organic fertilizer from city mud includes such steps as adding natural dewatering agent instead of polyacrylamide for good solubility and low poison, adding the material soluble to phosphoric acid and the material for passivating heavy metals, inoculating VT bacteria as aerating agent for softening mud and releasing nutrients, high-temp high-pressure puffing, granulating, and inoculating bacteria again. Its advantages are bialanced rich nutrients, high solubility, and high physical properties.

Description

technical field [0001] The invention relates to a method for producing compound organic fertilizer, in particular to a method for producing three-dimensional (organic-inorganic-microbial) compound organic fertilizer by utilizing urban sludge. Background technique [0002] Sludge contains a large amount of organic matter, nitrogen, phosphorus and other plant nutrients, with an organic matter content of 20-40%, which is a waste resource with great utilization value. [0003] 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; It is easy to pollute the 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 from the dev...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/14C05F7/00C05F17/00C05G1/00C05G5/00
CPCY02A40/20Y02W10/37Y02W30/40
Inventor 李波李季刘海鹰杨跃进甄彪陈伯爽吕贻忠韩燕焦进琳
Owner 李波
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