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Preparation method of sludge ceramsite used for medium and low concentration ammonia nitrogen wastewater treatment

A low-concentration ammonia nitrogen and sludge ceramsite technology, which is applied in ceramic products, applications, clay products, etc., can solve secondary pollution and other problems, achieve low cost, facilitate adsorption, and increase the specific surface area.

Inactive Publication Date: 2016-08-03
WUHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If it is not handled properly, it will be placed randomly, which will cause secondary pollution

Method used

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  • Preparation method of sludge ceramsite used for medium and low concentration ammonia nitrogen wastewater treatment
  • Preparation method of sludge ceramsite used for medium and low concentration ammonia nitrogen wastewater treatment
  • Preparation method of sludge ceramsite used for medium and low concentration ammonia nitrogen wastewater treatment

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] 1) Pretreatment of raw materials: Soak the fly ash at 25°C for 3 days with 5% NaOH solution by mass percentage, wash it with deionized water, and dry it at 105°C in an electric constant temperature drying oven; The remaining sludge in the dehydration workshop of the factory is dried at 105°C; the clay is dried at 105°C; the above three raw materials are dried and pulverized by a pulverizer, and passed through a 100-mesh sieve for later use;

[0057] 2) Mixing of raw materials: take pretreated fly ash, 60% residual sludge, and 10% clay in a mass ratio of 30% and fully mix to obtain a dry material;

[0058] 3) Granulation: add an appropriate amount of deionized water to the above dry material and stir evenly to make a 1-3mm billet, and place it on a tray and dry it in an oven at 110°C until the surface is free of moisture;

[0059] 4) Firing: Put the dried billet into the muffle furnace and heat it to 350°C, preheat for 30 minutes, then heat up to 800°C and fire for 10 mi...

Embodiment 2

[0068] 1) Pretreatment of raw materials: Soak the fly ash at 25°C for 3 days with 5% NaOH solution by mass percentage, wash it with deionized water, and dry it at 105°C in an electric constant temperature drying oven; The remaining sludge in the dehydration workshop of the factory is dried at 105°C; the clay is dried at 105°C; the above three raw materials are dried and pulverized by a pulverizer, and passed through a 100-mesh sieve for later use;

[0069] 2) Mixing of raw materials: taking pretreated fly ash, 40% of excess sludge and 10% of clay in a mass ratio of 50% and fully mixing to obtain a dry material;

[0070] 3) Granulation: add an appropriate amount of deionized water to the above dry material and stir evenly to make a 1-3mm billet, and place it on a tray and dry it in an oven at 110°C until there is no moisture on the surface;

[0071] 4) Firing: Put the dried billet into a muffle furnace and heat it to 450°C, preheat for 40 minutes, then heat up to 800°C and fire...

Embodiment 3

[0074] 1) Pretreatment of raw materials: Soak the fly ash at 25°C for 3 days with 5% NaOH solution by mass percentage, wash it with deionized water, and dry it at 105°C in an electric constant temperature drying oven; The remaining sludge in the dehydration workshop of the factory is dried at 105°C; the clay is dried at 105°C; the above three raw materials are dried and pulverized by a pulverizer, and passed through a 100-mesh sieve for later use;

[0075] 2) Mixing of raw materials: take pretreated fly ash, 30% residual sludge, and 10% clay in a mass ratio of 60% and fully mix to obtain a dry material;

[0076] 3) Granulation: add an appropriate amount of deionized water to the above dry material and stir evenly to make a 1-3mm billet, and place it on a tray and dry it in an oven at 110°C until there is no moisture on the surface;

[0077] 4) Firing: Put the dried billet into a muffle furnace and heat it to 500°C, preheat it for 10 minutes, then raise the temperature to 1100°...

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Abstract

The invention provides a preparation method of sludge ceramsite used for medium and low concentration ammonia nitrogen wastewater treatment. The preparation method comprises the following steps: immersing fly ash in a 3-6% NaOH solution at 20-30DEG C for 3-4d, washing the immersed fly ash with deionized water, and drying the washed fly ash at 100-110DEG C; drying excess sludge and clay at 100-110DEG C; drying above three raw materials, crushing the dried three raw materials, and sieving the crushed three raw materials for later use; fully mixing, by mass, 30-60% of the preprocessed fly ash, 30-60% of the preprocessed excess sludge and 10% of the preprocessed clay to obtain a dry material; adding a proper amount of deionized water to the dry material, uniformly stirring to prepare a 1-3mm blank, placing the blank in a tray, and drying the tray in a 110DEG C oven until the surface of the blank has no water; putting the dried blank in a muffle furnace, heating the blank to 350-500DEG C, preheating the blank for 10-40min, heating the blank to 800-1100DEG C, sintering the blank for 10-25min, cooling the obtained product in the furnace to 180-200DEG C, and taking out the cooled product to obtain the sludge ceramsite. The sludge ceramsite prepared in the invention has the advantages of low price, economical property, high efficiency, environmental protection, and suitableness for treatment of medium and low concentration ammonia nitrogen wastewaters.

Description

technical field [0001] The invention relates to a preparation method of sludge ceramsite which can be used for the treatment of medium and low concentration ammonia nitrogen wastewater, and belongs to the fields of waste resource utilization and sewage treatment. Background technique [0002] Ammonia nitrogen, refers to the free ammonia (or non-ionic ammonia NH 3 ,) or ionic ammonia (NH 4 + ) form of nitrogen. Ammonia nitrogen mainly comes from human and animal excrement, rainwater runoff, loss of agricultural fertilizers, and industrial wastewater such as petrochemical, metallurgy, gas, and coking. [1] . The harm caused by the massive discharge of ammonia nitrogen wastewater is firstly the excessive consumption of dissolved oxygen in water, which leads to the death of fish and other aquatic organisms due to hypoxia, and at the same time causes the phenomenon of eutrophication in water bodies; secondly, the ammonia nitrogen oxidation product nitrite nitrogen is toxic and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B38/06C04B33/135C04B33/132
CPCC04B33/1321C04B33/1352C04B38/0665C04B38/0067Y02P40/60
Inventor 邵青周靖淳朱祖福宋银强牛沛
Owner WUHAN UNIV
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