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Method for preparing soil conditioner by compounding waste incineration fly ash with sludge

A technology of waste incineration fly ash and soil improver, which is applied in the field of environmental engineering, can solve the problems of excessive and restricted heavy metal toxic substances, achieve the effects of improving concentration characteristics, reducing moisture content, and improving dehydration characteristics

Inactive Publication Date: 2017-01-18
福建洋屿环保科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the main methods of sludge treatment and disposal at home and abroad are sanitary landfill, sludge agricultural use and sludge incineration. In my country, landfill and agricultural use are mainly used. With the increase of sludge volume, each sludge landfill disposal site is also tending to The excess of heavy metals and other toxic substances in some urban sludge also restricts agricultural use

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] A method for compounding waste incineration fly ash and sludge into a soil conditioner, comprising the steps of:

[0021] (1) Mix water and waste incineration fly ash into the twin-screw mixer in order and proportion, stir evenly, add municipal domestic sludge, stir again, stirring time is 1 hour, and then send it to the membrane filter press for dehydration A sludge mixture is obtained; the ratio of the water to the waste incineration fly ash is 1:10; the ratio of the municipal domestic sludge to the waste incineration fly ash is 100:1. The water dehydrated in the membrane filter press can be mixed with the waste incineration fly ash in the twin-screw mixer in order and in proportion to stir.

[0022] (2) Transport the sludge mixture obtained in the previous step to the high-speed rotary mixing kiln, and transport the uniformly mixed heavy metal stabilizer to the high-speed rotary mixing kiln to stir with the sludge mixture, and use the heavy metal capture ability of t...

Embodiment 2

[0024] A method for compounding waste incineration fly ash and sludge into a soil conditioner, comprising the steps of:

[0025] (1) Mix water and waste incineration fly ash into the twin-screw mixer in order and proportion to stir. After stirring evenly, add municipal domestic sludge and stir again. The stirring time is 1.5 hours, and then send it to the membrane filter press for dehydration A sludge mixture is obtained; the ratio of the water to the waste incineration fly ash is 1:10; the ratio of the municipal domestic sludge to the waste incineration fly ash is 125:1. The water dehydrated in the membrane filter press can be mixed with the waste incineration fly ash in the twin-screw mixer in order and in proportion to stir.

[0026] (2) Transport the sludge mixture obtained in the previous step to the high-speed rotary mixing kiln, and transport the uniformly mixed heavy metal stabilizer to the high-speed rotary mixing kiln to stir with the sludge mixture, and use the heav...

Embodiment 3

[0028] A method for compounding waste incineration fly ash and sludge into a soil conditioner, comprising the steps of:

[0029] (1) Mix water and waste incineration fly ash into the twin-screw mixer according to the order and proportion, stir evenly, add municipal domestic sludge, stir again, the stirring time is 2 hours, and then send it to the membrane filter press for dehydration A sludge mixture is obtained; the ratio of the water to the waste incineration fly ash is 1:10; the ratio of the municipal domestic sludge to the waste incineration fly ash is 150:1. The water dehydrated in the membrane filter press can be mixed with the waste incineration fly ash in the twin-screw mixer in order and in proportion to stir.

[0030] (2) Transport the sludge mixture obtained in the previous step to the high-speed rotary mixing kiln, and transport the uniformly mixed heavy metal stabilizer to the high-speed rotary mixing kiln to stir with the sludge mixture, and use the heavy metal c...

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PUM

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Abstract

The invention discloses a method for preparing a soil conditioner by compounding waste incineration fly ash with sludge. The method comprises the following steps: 1, sequentially mixing water and the waste incineration fly ash in a double screw stirrer in proportion, uniformly stirring water and the waste incineration fly ash, adding urban domestic sludge, stirring for 1-2 h, sending the obtained material to a diaphragm filter press, and dehydrating the mixture to obtain a sludge mixture; and 2, conveying the sludge mixture obtained in step 1 into a high speed rotary mixing kiln, conveying a uniformly mixed heavy metal stabilizer into the high speed rotary mixing kiln, stirring the heavy metal stabilizer and the sludge mixture at a low speed for 30-90 min in a controlled pH value range of 7.5-9, and packaging the uniformly stirred sludge mixture to form the soil conditioner prepared by compounding waste incineration fly ash with sludge, wherein the heavy metal capture ability of the stabilizer is used to control heavy metal diffusion.

Description

technical field [0001] The invention relates to a method for compounding waste incineration fly ash and sludge into a soil improver, belonging to the technical field of environmental engineering. Background technique [0002] Waste incineration fly ash is rich in heavy metals and some organic dioxins, which are classified as hazardous waste. How to dispose and utilize waste incineration ash has become a major problem to be solved in the pollution control of domestic waste incineration. At present, most countries use the stabilized landfill method to deal with fly ash, but the capacity of fly ash after solidification increases greatly, and decreases with the increase of landfill capacity relative to fly ash, which cannot absorb fly ash. Currently, many countries and The region is looking for ways to utilize fly ash resources. At present, fly ash can be recycled mainly through glass ceramics, roadbed fillers, fertilizers and soil conditioners, and making cement or concrete. ...

Claims

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Application Information

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IPC IPC(8): C09K17/40
CPCC09K17/40
Inventor 刘和平钟云峰陈志伟
Owner 福建洋屿环保科技股份有限公司