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Method for preparing active fly ash phosphorus adsorbent

A technology of phosphorus adsorbent and fly ash, which is applied in the field of preparation of adsorbent and active fly ash phosphorus adsorbent, can solve the problems of increased pH value, large sludge production, excessive ash content, etc., and achieves a solution Dealing with problems, reducing the amount of dosage, and the effects of a wide range of sources

Inactive Publication Date: 2005-09-21
SHANGHAI JIAO TONG UNIV
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  • Summary
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AI Technical Summary

Problems solved by technology

Such a high dosage causes the following three major problems: 1. Excessive ash content and difficulty in separating gray water, resulting in a serious excess of suspended solids-SS in the effluent; 2. Fly ash contains a large amount of free calcium oxide, calcium oxide After a chemical reaction with water, calcium hydroxide is generated, thereby increasing the alkalinity. Actual research shows that when the dosage is 2g / L, the pH value of the sewage rises significantly to 10, which exceeds the national secondary sewage discharge standard; 3. Mud production The amount is too large, and the sludge treatment and disposal are difficult

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] The raw material is fly ash from a power plant in Shanghai, and 10 kg of fly ash and 2 kg of sodium silicate are mixed evenly in a high-speed mixer. The mixture is put into a medium-temperature roaster and activated at 600° C. for 1 hour. The roasted and activated material was taken out and cooled, then put into an acid-resistant reaction tank, and 5L of 5% hydrochloric acid was added and heated to 60°C for 4 hours of reaction. After the reaction, a material is generated, which is dried and ground to make a total of 11.2 kg of powdered highly active phosphorus adsorbent product.

[0020] Phosphorus removal experiments in domestic sewage were carried out using the phosphorus adsorbent prepared by the above process. The domestic sewage is taken from Shanghai Xinzhuang Water Quality Purification Plant, the phosphorus content of the raw water is 2.9mg / L, and the pH is 7.1. Take 1 gram of phosphorus adsorbent and put it into 10L of the domestic sewage, stir it rapidly for ...

Embodiment 2

[0022] The raw material is fly ash from a power plant in Shanghai, and 10 kg of fly ash and 10 kg of calcium silicate are mixed evenly in a high-speed mixer. The mixture is put into a medium-temperature roasting furnace and activated by roasting at 1000°C for 4 hours. The material after roasting and activation was taken out and cooled and put into an acid-resistant reaction tank, and 5L of 10% sulfuric acid was added and heated to 60°C for 10 hours of reaction. After the reaction, a material is generated, which is dried and ground to make a total of 19.7 kg of powdered highly active phosphorus adsorbent product.

[0023] Phosphorus removal experiments in domestic sewage were carried out using the phosphorus adsorbent prepared by the above process. The domestic sewage is taken from Shanghai Xinzhuang Water Quality Purification Plant, the phosphorus content of the raw water is 2.9mg / L, and the pH is 7.1. Take 1 gram of phosphorus adsorbent and put it into 10L of the domestic s...

Embodiment 3

[0025] The raw material is fly ash from a power plant in Shanghai, and 10 kg of fly ash and 3 kg of calcium carbonate are mixed evenly in a high-speed mixer. Put the mixture into a medium-temperature roaster and activate it by roasting at 700°C for 2 hours. The material after roasting and activation is taken out and cooled and put into an acid-resistant reaction tank, and 5L of 7% nitric acid is added and heated to 60°C for 6 hours of reaction. After the reaction, a material is generated, which is dried and ground to make a total of 12.6 kg of powdered highly active phosphorus adsorbent product.

[0026] Phosphorus removal experiments in domestic sewage were carried out using the phosphorus adsorbent prepared by the above process. The domestic sewage is taken from Shanghai Xinzhuang Water Quality Purification Plant, the phosphorus content of the raw water is 2.9mg / L, and the pH is 7.1. Take 1 gram of phosphorus adsorbent and put it into 10L of the domestic sewage, stir it ra...

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Abstract

The invention relates to a method for preparing an active coal ash phosphoric adsorbent, which comprises the following steps: a) mixing the coal ash and the basic activating agent evenly in the high-speed batch mixer, b) roasting and activating them in the calcining furnace, c) putting them into the acidproof retort after cooling and adding acidic modifier into the retort, d) heating them to react, then drying and grinding the materials and getting the powdered phosphoric adsorbent with high active. Said invention uses the industrial waste coal ash as the raw material, and by means of the low-cost activating agent and modifier it can dissolve out the material with high absorptive in the coal ash, and the prepared absorbent has high dephosphorize effect.

Description

technical field [0001] The invention relates to a preparation method of an active fly ash phosphorus adsorbent, which is a preparation method of an adsorbent for removing phosphorus in water by using industrial waste fly ash as a raw material, and belongs to the technical field of water treatment. Background technique [0002] In recent years, the eutrophication of lakes and rivers caused by excessive nutrients such as nitrogen and phosphorus in water bodies has become a major environmental problem facing our country. Scientific research shows that when the total phosphorus content in slow-flowing water bodies such as lakes and reservoirs exceeds 0.02mg / L, blue-green algae blooms may break out. At present, most of the domestic and foreign phosphorus removal methods are biological or physical and chemical. When the biological phosphorus removal method is used, large-scale transformation of conventional secondary urban sewage treatment plants is required, and the construction...

Claims

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Application Information

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IPC IPC(8): B01J20/00C02F1/28
Inventor 孔海南陈雪初王新泽
Owner SHANGHAI JIAO TONG UNIV
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