Modified coal ash used for treating ammonia nitrogen waste water and preparation method thereof

A technology for ammonia nitrogen wastewater and fly ash, which is applied in chemical instruments and methods, adsorption water/sewage treatment, water/sludge/sewage treatment, etc., can solve the problem of unsatisfactory removal effect of fly ash on ammonia nitrogen and long modification time , few reports on fly ash modification methods, etc., to achieve resource utilization, shorten modification time, and significant removal effect

Inactive Publication Date: 2011-09-21
SHANXI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, the modification time of the above-mentioned modification processes is too long. Document 3 added a calcination process in the modification process, which can shorten the modification time appropriately, but the calcination temperature is too high at 850°C for 2 hours, which consumes more energy and uses There are few reports on fly ash modification methods for treating ammonia nitrogen wastewater, and the removal effect of modified fly ash on ammonia nitrogen is not ideal, such as the literature: Surface modification of fly ash and its removal of ammonia nitrogen in water. Suzhou School of Science and Technology.2008.22
Stir fly ash with different concentrations of sodium hydroxide at a constant temperature of 85°C for 4 hours, then wash with distilled water until neutral, filter, dry and modify, the removal rate of fly ash to ammonia nitrogen increases from 29% to 47%, with lower removal rates

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] Take 10 grams of sodium hydroxide and 50 grams of fly ash and mix them evenly, put them in a muffle furnace, calcine at 200 ° C for 0.5 h, and grind and sieve (40 mesh) after cooling. Take 50 grams of calcined sample and 50 grams of distilled water in a four-necked flask, mix and stir until the temperature of the constant temperature water bath rises to 70 °C, stop stirring, keep the gel at a constant temperature for 2 hours, continue to heat up to 100 °C, then constant temperature crystallization for 3.5 hours, suction filtration, Washed with distilled water until neutral, placed in an oven and dried at 100° C., ground and sieved (160 mesh) after cooling to obtain modified fly ash.

[0012] The modified fly ash obtained in Example 1 and the original ash before modification were used to measure the cation exchange capacity. The results are shown in Table 1. It can be seen from Table 1 that the cation exchange capacity of the modified fly ash is significantly increased. ...

Embodiment 2

[0017] Take 20 grams of sodium hydroxide and 50 grams of fly ash and mix them evenly, put them in a muffle furnace, calcinate at 400 ° C for 0.8 h, and grind and sieve (60 mesh) after cooling. Take 50 grams of calcined sample and 150 grams of distilled water in a four-necked flask, mix and stir until the temperature of the constant temperature water bath rises to 70 °C, stop stirring, and keep the gel at constant temperature for 1.8 hours, continue to heat up to 100 °C, then constant temperature crystallization for 4 hours, suction filtration, Washed with distilled water until neutral, placed in an oven and dried at 105° C., ground and sieved (180 mesh) after cooling to obtain modified fly ash.

[0018] The modified fly ash obtained in Example 2 and the original ash before modification were used to measure the cation exchange capacity. The results are shown in Table 2. It can be seen from Table 2 that the cation exchange capacity of the modified fly ash is significantly increa...

Embodiment 3

[0023] Take 30 grams of sodium hydroxide and 50 grams of fly ash and mix them evenly, put them in a muffle furnace, calcinate at 500 ° C for 1 hour, grind and sieve (100 mesh) after cooling. Take 50 grams of calcined sample and 250 grams of distilled water in a four-necked flask, mix and stir until the temperature of the constant temperature water bath rises to 70 °C, stop stirring, and keep the gel at a constant temperature for 1.5 hours. Washed with distilled water until neutral, placed in an oven and dried at 110° C., ground and sieved (200 mesh) after cooling to obtain modified fly ash.

[0024] The modified fly ash obtained in Example 3 and the original ash before modification were used to measure the cation exchange capacity. The results are shown in Table 3. It can be seen from Table 3 that the cation exchange capacity of the modified fly ash is significantly increased.

[0025] Table 3 Comparison of cation exchange capacity before and after fly ash modification

[00...

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PUM

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Abstract

The invention relates to modified coal ash used for treating ammonia nitrogen waste water, which is prepared by the following steps of: calcining NaOH and coal ash at a low temperature after NaOH and coal ash are uniformly mixed in proportion, cooling, grinding and sieving, then adding 1-5 times of water by weight, mixing, stirring, heating to the temperature of 70 DEG C and stopping stirring, gelling for 1.5-2 hours at constant temperature, then heating to the temperature of 100 DEG C, crystallizing for 3-4 hours at constant temperature, carrying out suction filtering, washing to be neutral with water, drying, cooling and then grinding and sieving, thus the modified coal ash is obtained. In the invention, NaOH low temperature calcining hydrothermal synthesis is adopted to modify the coal ash, the physical structure of the coal ash is destroyed, the modification time is shortened and a new zeolite mineral phase is generated under the condition of low alkali addition amount, the specific area of the coal ash is increased, and the cation exchange performance of the coal ash is improved. The modified coal ash provided by the invention is used for treating the ammonia nitrogen waste water, and the removing effect is obvious. By adopting the modified coal ash provided by the invention, wastes are treated with wastes, the resource utilization of wastes is realized, and the utilization factor of the coal ash is improved.

Description

technical field [0001] The invention relates to solid waste resource utilization and water treatment technology, in particular to a modified fly ash for treating ammonia nitrogen wastewater and a preparation method thereof. Background technique [0002] Ammonia nitrogen is one of the important pollutants in water, mainly from urban domestic sewage, industrial wastewater from various industries and fertilizers used in agricultural production. Excessive nitrogen content in water bodies will not only deteriorate the quality of the water environment, cause eutrophication of water bodies, but also cause serious harm to humans and animals. At present, the methods of treating ammonia nitrogen wastewater at home and abroad mainly include stripping method, chemical precipitation method, ion exchange method and so on. The ion exchange method is a method in which the exchangeable ions on insoluble ionic compounds exchange with the same ions in the solution to remove harmful ions. It i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/16B01J20/30B01J39/14C02F1/28C02F1/42C02F101/16
Inventor 程芳琴陈潇晶郭彦霞
Owner SHANXI UNIV
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