A preparation method of a chitosan phosphorus-removing material and the chitosan phosphorus-removing material

Abstract

The invention provides a method for preparing a chitosan phosphorus-removing material by a spray-drying process. The preparation method includes the following steps: adding chitosan and metal salts into water for even dispersion to form a mixed solution; spray-drying the mixed solution to prepare the chitosan phosphorus-removing material. The invention also provides the chitosan phosphorus-removing material prepared by the preparation method. The preparation method of the invention is simple and mild in process conditions, and the prepared phosphorus-removing adsorption material has large absorption capacity.

Description

technical field

[0001] The invention relates to a preparation method of a chitosan phosphorus removal material, a chitosan phosphorus removal material and an application thereof. Background technique

[0002] With the rapid development of industry, the development and utilization of environmental resources by human beings has become increasingly frequent, resulting in a large amount of sewage and wastewater containing nutrients such as nitrogen and phosphorus. The pollution of natural water bodies around the world is not optimistic, and eutrophication of water bodies has become an important problem that needs to be solved urgently. Nitrogen and phosphorus are the main causes of water eutrophication, and phosphorus is often regarded as one of the main inducing factors of water eutrophication. Therefore, phosphorus removal from water body is of great significance to control eutrophication.

[0003] At present, a variety of technologies have been used for phosphorus removal i...

Examples

Embodiment 1

[0047] Get 50g particle diameter and be 1mm, deacetylation degree 90%, the chitosan that viscosity-average molecular weight is 100000, join in 10L aqueous solution, after making it form suspension with the speed stirring of 60 rev / mins, add 41g Fe(NO 3 ) 3 , 26g MnSO 4 , 94g Al(NO 3 ) 3 , after stirring evenly, use spray drying technology to dry to obtain adsorption and phosphorus removal materials. The spray drying conditions are as follows: inlet air temperature 150°C, outlet air temperature 80°C, drying time 1.5S, maximum water evaporation 8Kg / h, peristaltic pump feed 2L / h, dry air flow rate 1.5m 3 / min, spray gas flow rate 0.5m 3 / h, the nozzle diameter is 2mm, and the recovery rate of dry powder is 95%.

Embodiment 2

[0049] Weigh 41g Fe(NO 3 ) 3 , 26g MnSO 4 , 94g Al(NO 3 ) 3 , added to 16L of water, stirred at a speed of 50 rpm to dissolve it, then added 50g of chitosan with a particle size of 1mm, a degree of deacetylation of 90%, and a viscosity-average molecular weight of 300,000. Technical drying to obtain adsorption and phosphorus removal materials. The spray drying conditions are as follows: inlet air temperature 200°C, outlet air temperature 100°C, drying time 1.5S, maximum water evaporation 8Kg / h, peristaltic pump feed 2L / h, drying air flow 1.5m 3 / min, spray gas flow rate 0.5m 3 / h, the nozzle diameter is 2mm, and the recovery rate of dry powder is 95%.

Embodiment 3

[0051] Get 30g of chitosan whose particle size is 3mm, degree of deacetylation 80%, viscosity average molecular weight is 250000, join in 8L aqueous solution, after stirring at a speed of 30 rpm to form a suspension, add 54g FeCl 3 , 59.4g MnCl 2 , 51.3g Al 2 (SO 4 ) 3 , after stirring evenly, use spray drying technology to dry to obtain adsorption and phosphorus removal materials. The spray drying conditions are as follows: inlet air temperature 100°C, outlet air temperature 50°C, drying time 1S, maximum water evaporation 10Kg / h, peristaltic pump feed 2L / h, dry air flow 1m 3 / min, spray gas flow rate 0.2m 3 / h, the nozzle diameter is 3mm, and the recovery rate of dry powder is 95%.

technical field

[0001] The invention relates to a preparation method of a chitosan phosphorus removal material, a chitosan phosphorus removal material and an application thereof. Background technique

[0002] With the rapid development of industry, the development and utilization of environmental resources by human beings has become increasingly frequent, resulting in a large amount of sewage and wastewater containing nutrients such as nitrogen and phosphorus. The pollution of natural water bodies around the world is not optimistic, and eutrophication of water bodies has become an important problem that needs to be solved urgently. Nitrogen and phosphorus are the main causes of water eutrophication, and phosphorus is often regarded as one of the main inducing factors of water eutrophication. Therefore, phosphorus removal from water body is of great significance to control eutrophication.

[0003] At present, a variety of technologies have been used for phosphorus removal i...

Examples

Embodiment 1

[0047] Get 50g particle diameter and be 1mm, deacetylation degree 90%, the chitosan that viscosity-average molecular weight is 100000, join in 10L aqueous solution, after making it form suspension with the speed stirring of 60 rev / mins, add 41g Fe(NO 3 ) 3 , 26g MnSO 4 , 94g Al(NO 3 ) 3 , after stirring evenly, use spray drying technology to dry to obtain adsorption and phosphorus removal materials. The spray drying conditions are as follows: inlet air temperature 150°C, outlet air temperature 80°C, drying time 1.5S, maximum water evaporation 8Kg / h, peristaltic pump feed 2L / h, dry air flow rate 1.5m 3 / min, spray gas flow rate 0.5m 3 / h, the nozzle diameter is 2mm, and the recovery rate of dry powder is 95%.

Embodiment 2

[0049] Weigh 41g Fe(NO 3 ) 3 , 26g MnSO 4 , 94g Al(NO 3 ) 3 , added to 16L of water, stirred at a speed of 50 rpm to dissolve it, then added 50g of chitosan with a particle size of 1mm, a degree of deacetylation of 90%, and a viscosity-average molecular weight of 300,000. Technical drying to obtain adsorption and phosphorus removal materials. The spray drying conditions are as follows: inlet air temperature 200°C, outlet air temperature 100°C, drying time 1.5S, maximum water evaporation 8Kg / h, peristaltic pump feed 2L / h, drying air flow 1.5m 3 / min, spray gas flow rate 0.5m 3 / h, the nozzle diameter is 2mm, and the recovery rate of dry powder is 95%.

Embodiment 3

[0051] Get 30g of chitosan whose particle size is 3mm, degree of deacetylation 80%, viscosity average molecular weight is 250000, join in 8L aqueous solution, after stirring at a speed of 30 rpm to form a suspension, add 54g FeCl 3 , 59.4g MnCl 2 , 51.3g Al 2 (SO 4 ) 3 , after stirring evenly, use spray drying technology to dry to obtain adsorption and phosphorus removal materials. The spray drying conditions are as follows: inlet air temperature 100°C, outlet air temperature 50°C, drying time 1S, maximum water evaporation 10Kg / h, peristaltic pump feed 2L / h, dry air flow 1m 3 / min, spray gas flow rate 0.2m 3 / h, the nozzle diameter is 3mm, and the recovery rate of dry powder is 95%.

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