Sludge fuel and preparation method thereof

A sludge and fuel technology, applied in the field of environmental science, can solve the problems of difficult treatment of urban sludge and achieve the effects of improving heat and mass transfer efficiency, increasing contact area, and increasing mass transfer area

Inactive Publication Date: 2009-12-09
WUHAN GLT ENERGY & ENVIRONMENTAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The purpose of the present invention is to provide a kind of sludge fuel and its preparation method aiming at the defects of existing sludge tre

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] The digested sludge from a domestic sewage treatment plant has a moisture content of 80.4%wt, a dry basis volatile matter of 41.6%wt, and a dry basis combustion calorific value of 8670kJ / kg; the rice husk ash is taken from the ash after burning rice husks in industrial boilers. Its silicon dioxide content is about 65%, and its carbon content is about 31%. Mix the sludge containing domestic water, rice husk ash and deodorizing fungicide in proportion, and then dry it naturally. The drying conditions are as follows: drying on the concrete floor, the thickness of the mixture is about 10cm, at the highest temperature of 27°C, drying for 10 hours on a sunny day, turning once an hour. The specific data and combustion calorific value are shown in Table 1.

[0023] Note: in table 1: in sample 1, deodorizing bactericide is the mixture of 80%wt calcium oxide and 20% calcium hypochlorite; The deodorizing bactericide of sample 2 is calcium hypochlorite (technical grade bleaching p...

Embodiment 2

[0027] The sludge obtained from a paper mill after sewage treatment has a moisture content of 67.3%wt, a dry basis volatile matter of 61.2%wt, and a dry basis combustion calorific value of 12029kJ / kg; the rice husk ash is obtained from the ash after burning rice husks in industrial boilers. Its silicon dioxide content is about 65%, and its carbon content is about 31%. Mix the paper-making sludge, rice husk ash and deodorizing fungicide evenly according to the proportion, and then dry naturally. The drying conditions are as follows: drying on the concrete floor, the thickness of the mixture is about 10cm, at the highest temperature of 29°C, drying for 10 hours on a sunny day, turning once an hour. The specific data and combustion calorific value are shown in Table 2.

[0028] Note: in table 1: in sample 1, deodorizing bactericide is the mixture of 80%wt calcium oxide and 20% calcium hypochlorite; The deodorizing bactericide of sample 2 is calcium hypochlorite (technical grade ...

Embodiment 3

[0032] Sludge from a printing and dyeing enterprise after sewage treatment, with a moisture content of 70.4%wt, a dry basis volatile matter of 49.5%wt, and a dry basis combustion calorific value of 10740kJ / kg; rice husk ash is taken from the ash after burning rice husks in industrial boilers , its silicon dioxide content is about 65%, and its carbon content is about 31%. Mix the paper-making sludge, rice husk ash and deodorizing fungicide evenly according to the proportion, and then dry naturally. The drying conditions are as follows: drying on the concrete floor, the thickness of the mixture is about 10cm, at the highest temperature of 27°C, drying for 10 hours on a sunny day, turning once an hour. The specific data and combustion calorific value are shown in Table 3.

[0033] Note: in table 1: in sample 1, the deodorizing bactericide is calcium oxide; The mass ratio is 6:4; the deodorizing bactericide in sample 4 is a mixture of 80%wt calcium oxide and 20% calcium hypochlo...

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Abstract

The invention discloses a sludge fuel and a preparation method thereof; the sludge fuel is mixed by the following composition of raw materials according to mass percent: 29.5-85 percent of water-contained sludge, 10-70 percent of rice husk ash, and 0.5-5 percent of deodorization bactericide. The sludge fuel solves the problem of difficult sludge treatment in cities and greatly reduces the cost ofsludge treatment, the sludge is prepared into fuel, the energy stored in the sludge is recycled, the sludge fuel ash after being combusted not only leads heavy metals to be passivated in a way of oxidizing materials, but also can utilizes silica highly contained in the ash to be prepared into building materials, thereby thoroughly carrying out safety treatment of sludge and rice husk ash and obtaining recycling utilization.

Description

technical field [0001] The invention relates to a sludge treatment method in the field of environmental science and technology, in particular to a sludge fuel and a preparation method thereof. Background technique [0002] Sludge is a solid sediment produced during sewage treatment, containing a large amount of water, inorganic ash and organic volatiles. With the rapid development of social economy and urbanization, my country's urban sewage treatment capacity has been continuously enhanced, and the amount of sludge produced has increased sharply. If it is not properly disposed of, it will not only occupy a large amount of land, but also cause secondary pollution to the environment, becoming a major public hazard affecting urban environmental sanitation. How to treat sludge scientifically and properly has become a key issue that must be solved for urban development. Sludge disposal methods generally include the following: [0003] Landfilling is basically similar to munic...

Claims

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Application Information

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IPC IPC(8): C10L5/46C10L5/44C10L5/00
CPCY02E50/30Y02E50/10
Inventor 余国贤吴宏观
Owner WUHAN GLT ENERGY & ENVIRONMENTAL TECH CO LTD
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