Ammonia removal in freshwater and saltwater systems

Patent metadata

Field	Value
Publication number	US-10766790-B2
Application number	US-201816200212-A
Country	US
Kind code	B2
Filing date	Nov 26, 2018
Priority date	Jan 16, 2015
Publication date	Sep 8, 2020
Grant date	Sep 8, 2020

Abstract

An ammonia adsorption product is described which may be used for fresh caught fish and bait. The product may comprise functionalized tectosilicate compound and a buffer. High concentrations of ammonia produced by fish waste can be lethal, even though oxygen availability is rich enough to keep fish breathing. The product is a user-friendly, sustainable, affordable product which is able to extend the life of the fish by safely removing ammonia by an ion-exchange mechanism. This product can convert toxic ammonia into ammonium and uptake ammonium by releasing sodium ions in the water.

First claim

What is claimed is:

1. A method for producing an ammonia removal agent for saltwater environments, comprising:
obtaining a tectosilicate compound wherein the tectosilicate compound is chabazite;
functionalizing the tectosilicate compound, comprising soaking the tectosilicate compound in a synthetic saltwater solution for 24 hours and replacing cations in the tectosilicate compound with sodium ions wherein the synthetic saltwater solution consists of:
an amount of water;
10.780 g/L of sodium;
0.42 g/L of potassium;
1.32 g/L of magnesium;
19.290 g/L of chloride
0.400 g/L of calcium;
0.200 g/L of bicarbonate;
2.66 g/L of sulfate; and
0.241 g/L of alkalinity;

washing the functionalized tectosilicate compound in deionized water; and
drying the functionalized tectosilicate compound.

2. The method of claim 1 , further comprising washing the tectosilicate compound in deionized water and drying the tectosilicate compound prior to soaking the tectosilicate compound in the synthetic saltwater solution.

3. The method of claim 2 , wherein the tectosilicate compound is washed using a shaker table for 24 hours to remove small particles.

4. The method of claim 1 , wherein functionalizing the tectosilicate compound increases a percentage of sodium in the tectosilicate compound by at least 30 percent.

5. The method of claim 1 , wherein the functionalized tectosilicate compound is dried in an oven at 110° C. for 5 hours.

6. The method of claim 1 , wherein the functionalized tectosilicate compound is regenerated by removing adsorbed ammonium ions and replacing them with sodium ions.

7. A method for controlling an ammonia level in a water environment, comprising:
providing a water environment;
providing a functionalized tectosilicate compound, the functionalized tectosilicate compound produced by the steps of:
obtaining a tectosilicate compound wherein the tectosilicate compound is chabazite;
functionalizing the tectosilicate compound, comprising:
soaking the tectosilicate compound in a synthetic freshwater solution or a synthetic saltwater solution; and
removing ions from the tectosilicate compound that have a lower cationic affinity than ammonium ions when the synthetic freshwater solution is used or replacing cations in the tectosilicate compound with sodium ions when the synthetic saltwater solution is used;
wherein the synthetic freshwater solution consists of:
an amount of water;
0.075 g/L of sodium;
0.00312 g/L of potassium;
0.024 g/L of magnesium;
0.193 g/L of chloride
0.043 g/L of calcium;
0.0048 g/L of bicarbonate;
0.096 g/L of sulfate; and
0.310 g/L of alkalinity;

wherein the synthetic saltwater solution consists of:
an amount of water;
10.780 g/L of sodium;
0.42 g/L of potassium;
1.32 g/L of magnesium;
19.290 g/L of chloride
0.400 g/L of calcium;
0.200 g/L of bicarbonate;
2.66 g/L of sulfate; and
0.241 g/L of alkalinity;

washing the functionalized tectosilicate compound in deionized water and then drying the compound; and

providing a container for the functionalized tectosilicate compound and a solid pH buffer, the container comprising a porous material to allow liquid to flow through the material;
providing for the container of functionalized tectosilicate compound to be placed in a water environment comprising a source of ammonia;
buffering the water system to a pH of about 7 and shifting an equilibrium between ammonia and ammonium in the water environment towards ammonium; and
adsorbing the ammonium using the functionalized tectosilicate.

8. The method of claim 7 , further comprising regenerating the functionalized tectosilicate compound by removing the adsorbed ammonium and replacing with sodium ions.

9. The method of claim 7 , further comprising washing the tectosilicate compound in deionized water and drying the tectosilicate compound prior to soaking the tectosilicate compound in the synthetic freshwater solution or the synthetic saltwater solution.

10. The method of claim 7 , wherein removing ions from the tectosilicate compound soaked in the synthetic freshwater solution comprises removing sodium ions from the tectosilicate compound.

11. The method of claim 10 , wherein functionalizing the tectosilicate compound reduces a percentage of sodium ionically bound to the compound by at least 50 percent.

12. The method of claim 7 , wherein the functionalized tectosilicate compound is dried in an oven at 110° C. for 5 hours.

13. The method of claim 7 , wherein functionalizing the tectosilicate compound by soaking the tectosilicate compound in the synthetic saltwater solution increases a percentage of sodium in the tectosilicate compound by at least 30 percent.

14. A system for removing ammonia from a saltwater environment, comprising:
a saltwater environment containing ammonia;
a functionalized tectosilicate compound, the functionalized tectosilicate compound produced by the steps of:
obtaining a tectosilicate compound wherein the tectosilicate compound is chabazite;
functionalizing the tectosilicate compound, comprising soaking the tectosilicate compound in a synthetic saltwater solution and replacing cations in the tectosilicate compound with sodium ions wherein the synthetic saltwater solution consists of:
an amount of water;
10.780 g/L of sodium;
0.42 g/L of potassium;
1.32 g/L of magnesium;
19.290 g/L of chloride
0.400 g/L of calcium;
0.200 g/L of bicarbonate;
2.66 g/L of sulfate; and
0.241 g/L of alkalinity;

washing the functionalized tectosilicate compound in deionized water and then drying the compound; and

a pH buffer, wherein the pH buffer is a phosphate buffer in a solid state wherein an amount of the pH buffer used is such that the pH buffer maintains a pH of 7 in the saltwater environment; and
a container holding the functionalized tectosilicate compound and the pH buffer, the container comprising a porous material to allow water to flow through the material;
wherein the pH of 7 of the water environment shifts an equilibrium between ammonia and ammonium in the water environment towards ammonium, and the ammonium is adsorbed by the functionalized tectosilicate.

15. The system of claim 14 , wherein the functionalized tectosilicate compound is regenerated after use by removing the adsorbed ammonium and replacing with sodium ions.

16. The system of claim 14 , wherein functionalizing the tectosilicate compound increases a percentage of sodium in the compound by at least 30 percent.

17. The system of claim 14 , wherein the phosphate buffer is Na 2 HPO 4 , NaH 2 PO 4 , or a combination thereof.

Assignees

• Alcantar Norma A
• Zhao Wen
• Ergas Sarina Joy
• Univ South Florida

Inventors

• Alcantar Norma A
• Zhao Wen
• Ergas Sarina Joy

Classifications

• B01J20/3071

  Washing or leaching · CPC title

• B01J20/2805

  Sorbents inside a permeable or porous casing, e.g. inside a container, bag or membrane · CPC title

• C02F2303/16

  Regeneration of sorbents, filters · CPC title

• B01J20/16

  Alumino-silicates (B01J20/12 takes precedence) · CPC title

• B01J20/3433

  of sorbents or filter aids other than those covered by B01J20/3408 - B01J20/3425 · CPC title