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Garbage incineration ash and sludge stabilizing method

A waste incineration ash and sludge technology, applied in cement production, etc., can solve the problems of heavy metals and other toxic substances exceeding the standard and restrictions, and achieve the effect of avoiding the sticky zone and realizing synergistic stabilization

Inactive Publication Date: 2019-01-01
马井芳
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

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, various sludge landfill disposal sites in Shanghai are also It tends to be saturated, and some toxic substances such as heavy metals in urban sludge exceed the standard, which also restricts agricultural use

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] Measure out 1000ml of raw sludge at room temperature, add 30g and 100g of ash respectively, and then add an appropriate amount of heavy metal stabilizer. The heavy metal stabilizer is composed of iron oxide, aluminum oxide, activated carbon and sodium phosphate in solid phase. Mix and stir for 20 minutes. The pH is controlled at 10, and after washing, pressing and drying, a mixture of fly ash and sludge can be obtained.

[0013] Ash has a great influence on the sedimentation performance and dehydration performance of sludge. After a period of time, the sludge without ash will expand, and the water content will be reduced from 95% to 80% after a certain pressure filtration process; adding 3% and The sludge with 10% ash has a certain improvement on the settling performance and greatly improves the dehydration performance, and the moisture content of the mixture can be reduced to 60-70% after dehydration.

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Abstract

The invention discloses a garbage incineration ash and sludge stabilizing method, which is characterized in that ash and sludge are mixed at a normal temperature according to a mass-volume ratio (g / ml) of 1:15-1:50, an appropriate amount of a heavy metal stabilizer is added and is formed by carrying out solid-phase mixing on iron oxide, aluminum oxide, active carbon and sodium phosphate, completemixing stirring is performed for 20-30 min, the pH value is controlled at 8-12, and washing, pressure filtration and drying are performed to obtain the ash and sludge mixture.

Description

technical field [0001] The invention relates to a method for stabilizing garbage incineration ash and sludge. Background technique [0002] With the development of cities and industries, the discharge of domestic sewage and industrial sewage is increasing day by day, so that the amount of sludge produced in sewage treatment is increasing day by day. 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, various sludge landfill disposal sites in Shanghai are also It tends to be saturated, and some toxic substances such as heavy metals in urban sludge exceed the standard, which also restricts agricultural use. Therefore, the contradiction between the rapid growth of sludge and the disposal capacity has become increasingly prominent. Therefore, under the premise of reduction, resource utilization,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B7/26C04B7/24C04B7/42
CPCC04B7/24C04B7/26C04B7/425Y02P40/10
Inventor 马井芳
Owner 马井芳