Modified flyash as well as preparation method and application thereof in urban sludge conditioning

A technology for fly ash and municipal sewage, which is applied in dewatering/drying/concentrating sludge treatment, separation methods, chemical instruments and methods, etc. problems, to achieve good economic benefits and application prospects, easy operation, and reduce the effect of sludge specific resistance

Inactive Publication Date: 2010-04-21
HUNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The chemical conditioning method is currently a widely used method for conditioning urban sewage sludge. It uses various coagulation chemicals (iron salts, aluminum salts, and polyelectrolytes, etc.) to condition sludge. However, traditional chemical conditioning Flocculants have some disadvantages, such as the low efficiency of adsorption and coagulation reaction of inorganic low molecular coagulants, resulting in large dosage and high processing costs; while organic polymer flocculants such as polyacrylamide have high costs, and their monomer propylene Amides are toxic and easily cause secondary pollution, which limits their application

Method used

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  • Modified flyash as well as preparation method and application thereof in urban sludge conditioning
  • Modified flyash as well as preparation method and application thereof in urban sludge conditioning
  • Modified flyash as well as preparation method and application thereof in urban sludge conditioning

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Embodiment 1

[0019] Take 1kg-2kg of raw fly ash, remove the large particles and other impurities, sieve it with a 120-mesh standard inspection sieve, dry the under-sieve in an oven at 103°C-107°C for 4 hours, and cool it in a desiccator for 2 hours. spare. We use sulfuric acid concentration, acid-ash ratio and acid leaching time as three main variables of the modified fly ash preparation technology of the present invention, and each variable all selects three different values, and promptly sulfuric acid concentration selects 2mol / L, 4mol / L There are three levels of L and 6mol / L, the three levels of acid-ash ratio are 1:1ml / g, 3:1ml / g, and 5:1ml / g, and the three levels of acid leaching time are 1h, 2h, and 3h, and then press the following Steps to prepare the modified fly ash of the present invention.

[0020] First weigh 9 parts of the above-mentioned standby fly ash, 10g each, and place them in 250ml glass beakers respectively. Mix reaction with fly ash (satisfy the above-mentioned desi...

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Abstract

The invention discloses modified flyash which is obtained by the steps of mixing a modified sulfuric acid solution and flyash, reacting, filtering and drying. The modified flyash can be effectively applied to the conditioning of urban sludge and has the advantages of good conditioning effect, low cost, effective utilization of waste resources, and the like.

Description

technical field [0001] The invention belongs to the field of treatment of urban sewage sludge, and in particular relates to an industrial waste and a modification method and application thereof. Background technique [0002] The remaining sludge of urban sewage treatment plants is an aggregate composed of bacterial micelles formed by various microorganisms and the organic and inorganic substances adsorbed, containing refractory organic substances, heavy metals and salts, as well as a small amount of pathogenic microorganisms and parasite eggs Wait. Its water content is very high, generally between 95% and 99.5%. It is bulky and difficult to handle, and has become a heavy economic burden for sewage treatment plants. The two major goals of sludge treatment are volume reduction and stabilization, so in order to reduce the volume of sludge, sludge must be dehydrated. During the dehydration process, remove as much water as possible to obtain a mud cake with a high solid content...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/02B01D37/02C02F11/12
Inventor 陈畅亚曾光明张盼月陈桂秋董金华
Owner HUNAN UNIV
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