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Method for preparing nutrient soil by performing mixed aerobic fermentation on sewage plant dewatered sludge and fly ash

A technology of dewatering sludge and aerobic fermentation, which is applied in the preparation of sewage/sludge fertilizer, fertilizer mixture, organic fertilizer, etc., to achieve the effect of reducing treatment costs

Inactive Publication Date: 2015-02-25
THUNIP CORP LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, no matter how it is used, the amount of fly ash produced is still far greater than its possible application. Therefore, the whereabouts of fly ash is still an important problem to be solved by municipal departments in various places

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] The dehydrated sludge (water content 76%) and fly ash are mixed in a mass ratio of 1:1. The moisture content after mixing drops to 60%. The mixing process needs to use a coulter mixer, and the mixing time is 2 minutes. The mixed materials are transported to the fermentation yard, and stacked evenly into stacks, the stack height is controlled at 1.5m, the width of each stack is set to 5m and the length is 10m. The sides of the stack are stacked at an inclination angle of 45 degrees.

[0030] After the stacking is completed or the fermentation tank is filled, it is covered with a waterproof and breathable membrane material to ensure that the moisture can pass through the membrane material and evaporate into the air during the fermentation process. The membrane material can also effectively intercept molecules that can produce odors and make the The gas entering the air through the membrane does not contain odor molecules, ensuring good air quality at the work site.

[0031]...

Embodiment 2

[0035] The dehydrated sludge (water content of 79%) and fly ash are mixed in a mass ratio of 1:0.9 by volume. The moisture content after mixing drops to 55%. The mixing process needs to use a coulter blender, and the mixing time is 3 minutes.

[0036] The mixed materials are fermented in a fermentation tank. The pile height of the materials in the fermentation tank is controlled at 1.5m, the tank width is 8m, and the length is 12m.

[0037] After the stacking is completed or the fermentation tank is filled, it is covered with a waterproof and breathable membrane material to ensure that the moisture can pass through the membrane material and evaporate into the air during the fermentation process. The membrane material can also effectively intercept molecules that can produce odors and make the The gas entering the air through the membrane does not contain odor molecules, ensuring good air quality at the work site.

[0038] The ventilation of the stack adopts the method of embedding ...

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PUM

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Abstract

The invention provides a method for preparing nutrient soil by performing mixed aerobic fermentation on sewage plant dewatered sludge and fly ash. The mass ratio of the sludge to the fly ash is 1:0.7-1:1. The method provided by the invention can effectively reduce the environmental hazards respectively caused by the sludge and fly ash. The sewage plant dewatered sludge and fly ash are major problems which are faced by the municipal department at present, and favorable treatment measures can not be easily found. The combination of the sewage plant dewatered sludge and fly ash for preparing the nutrient soil solves the two problem at one time. 1 ton of dewatered sludge can consume about 0.7-1 ton of fly ash.

Description

Technical field [0001] The invention belongs to the field of organic fertilizer preparation, and specifically relates to a method for preparing organic fertilizer by aerobic fermentation. Background technique [0002] Dewatered sludge in wastewater treatment plants currently has a variety of disposal processes, among which aerobic fermentation process has gradually increased in recent years. The aerobic fermentation of sludge is mainly to mix the dehydrated sludge with a moisture content of about 80% with appropriate auxiliary materials to reduce the moisture content to below 60%, and greatly reduce the viscosity of the sludge. Loose granular solid piles. In this state, properly ventilate the piles. Aerobic fermentation bacteria in the sludge can quickly form a growth advantage. These bacteria can quickly form other types of organic matter in the sludge. The function of decomposition, at the same time, releases a large amount of heat, which increases the temperature of the stack...

Claims

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Application Information

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IPC IPC(8): C05G1/00C05F17/00
CPCC05D9/00C05F17/00C05F7/00Y02W30/40
Inventor 王旭李星文葛志强袁琳刘俊红
Owner THUNIP CORP LTD