A kind of preparation method of chitosan phosphorus removal material and chitosan phosphorus removal material

Abstract

The present invention provides a method for preparing chitosan phosphorus removal material by spray drying method. The preparation method comprises the following steps: adding chitosan and metal salt into water respectively to make them uniformly dispersed to form a mixed solution; The chitosan phosphorus removal material was prepared by spray drying. The present invention also provides a chitosan phosphorus removal material prepared by the above preparation method. The preparation method of the invention is simple, the process conditions are mild, and the prepared phosphorus removal adsorption material has a large adsorption capacity.

Description

technical field

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

[0002] With the rapid development of industry, the development and utilization of environmental resources by human beings are becoming more and more frequent, resulting in a large amount of sewage and wastewater containing nutrients such as nitrogen and phosphorus. The global natural water pollution situation is not optimistic, and water eutrophication has become an important problem 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 is of great significance for controlling eutrophication.

[0003] At present, various technologies have been used for phosphorus removal in water, such as chemical method, biological met...

Examples

Embodiment 1

[0047] Take 50g of chitosan with a particle size of 1mm, a degree of deacetylation of 90%, and a viscosity-average molecular weight of 100,000, add it to a 10L aqueous solution, stir at a speed of 60 rpm to make it form a suspension, add 41g Fe(NO) 3 ) 3 , 26g MnSO 4 , 94g Al(NO 3 ) 3 , After stirring evenly, use spray drying technology to dry the adsorption and phosphorus removal material. The spray drying conditions are: inlet air temperature 150 °C, outlet air temperature 80 °C, drying time 1.5S, maximum water evaporation 8Kg / h, peristaltic pump feeding 2L / h, dry air flow 1.5m 3 / min, spray gas flow 0.5m 3 / h, the nozzle diameter is 2mm, and the dry powder recovery rate is 95%.

Embodiment 2

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

Embodiment 3

[0051] Take 30g of chitosan with a particle size of 3mm, a degree of deacetylation of 80%, and a viscosity-average molecular weight of 250,000, add it to an 8L aqueous solution, stir at a speed of 30 rpm to form a suspension, and add 54g of FeCl 3 , 59.4g MnCl 2 , 51.3g Al 2 (SO 4 ) 3 , After stirring evenly, the adsorption and dephosphorization material is obtained by drying by spray drying technology. The spray drying conditions are: inlet air temperature 100°C, outlet air temperature 50°C, drying time 1S, maximum water evaporation 10Kg / h, peristaltic pump feeding 2L / h h, dry air flow 1m 3 / min, spray gas flow 0.2m 3 / h, the nozzle diameter is 3mm, and the dry powder recovery rate is 95%.

technical field

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

[0002] With the rapid development of industry, the development and utilization of environmental resources by human beings are becoming more and more frequent, resulting in a large amount of sewage and wastewater containing nutrients such as nitrogen and phosphorus. The global natural water pollution situation is not optimistic, and water eutrophication has become an important problem 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 is of great significance for controlling eutrophication.

[0003] At present, various technologies have been used for phosphorus removal in water, such as chemical method, biological met...

Examples

Embodiment 1

[0047] Take 50g of chitosan with a particle size of 1mm, a degree of deacetylation of 90%, and a viscosity-average molecular weight of 100,000, add it to a 10L aqueous solution, stir at a speed of 60 rpm to make it form a suspension, add 41g Fe(NO) 3 ) 3 , 26g MnSO 4 , 94g Al(NO 3 ) 3 , After stirring evenly, use spray drying technology to dry the adsorption and phosphorus removal material. The spray drying conditions are: inlet air temperature 150 °C, outlet air temperature 80 °C, drying time 1.5S, maximum water evaporation 8Kg / h, peristaltic pump feeding 2L / h, dry air flow 1.5m 3 / min, spray gas flow 0.5m 3 / h, the nozzle diameter is 2mm, and the dry powder recovery rate is 95%.

Embodiment 2

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

Embodiment 3

[0051] Take 30g of chitosan with a particle size of 3mm, a degree of deacetylation of 80%, and a viscosity-average molecular weight of 250,000, add it to an 8L aqueous solution, stir at a speed of 30 rpm to form a suspension, and add 54g of FeCl 3 , 59.4g MnCl 2 , 51.3g Al 2 (SO 4 ) 3 , After stirring evenly, the adsorption and dephosphorization material is obtained by drying by spray drying technology. The spray drying conditions are: inlet air temperature 100°C, outlet air temperature 50°C, drying time 1S, maximum water evaporation 10Kg / h, peristaltic pump feeding 2L / h h, dry air flow 1m 3 / min, spray gas flow 0.2m 3 / h, the nozzle diameter is 3mm, and the dry powder recovery rate is 95%.

Images