Microbial carrier and device for treating wastewater

Patent metadata

Field	Value
Publication number	US-11795080-B2
Application number	US-202117565872-A
Country	US
Kind code	B2
Filing date	Dec 30, 2021
Priority date	Dec 30, 2021
Publication date	Oct 24, 2023
Grant date	Oct 24, 2023

Abstract

A microbial carrier and a device for treating wastewater are provided. The microbial carrier includes a bacteriophilic material and a plurality of foam cells, wherein the foam cells are disposed in the bacteriophilic material. The bactericidal material is a reaction product of a composite, wherein the composition includes a hydrophobic polyvinyl alcohol and a cross-linking agent, wherein the surface energy of the hydrophobic polyvinyl alcohol is 30 mJ/m2 to 58 mJ/m2.

First claim

What is claimed is:

1. A microbial carrier, comprising a bacteriophilic material and a plurality of foam cells, wherein the plurality of foam cells is disposed in the bacteriophilic material, wherein the bacteriophilic material is a reaction product of a composition, wherein the composition comprises a hydrophobic polyvinyl alcohol (PVA) and a crosslinking agent, wherein a surface energy of the hydrophobic polyvinyl alcohol is 30 mJ/m 2 to 58 mJ/m 2 .

2. The microbial carrier as claimed in claim 1 , wherein Shore D hardness of the microbial carrier is 50 to 80.

3. The microbial carrier as claimed in claim 1 , wherein an average pore diameter of the microbial carrier is 100 μm to 600 μm.

4. The microbial carrier as claimed in claim 1 , wherein a porosity of the microbial carrier is 25 to 60%.

5. The microbial carrier as claimed in claim 1 , wherein a specific surface area of the microbial carrier is 4000 m 2 /m 3 to 7000 m 2 /m 3 .

6. The microbial carrier as claimed in claim 1 , wherein an abrasion of the microbial carrier is 100 mg/1000 cycles to 200 mg/1000 cycles.

7. The microbial carrier as claimed in claim 1 , wherein a microorganic adhesion of the microbial carrier is 8 mg vss /g carrier to 50 mg vss /g carrier .

8. The microbial carrier as claimed in claim 1 , wherein a weight ratio of the hydrophobic polyvinyl alcohol (PVA) to the crosslinking agent is 1:9 to 4:6.

9. The microbial carrier as claimed in claim 1 , wherein the hydrophobic polyvinyl alcohol (PVA) comprises a first repeating unit and a second repeating unit, wherein the first repeating unit has a structure represented by Formula (I), and the second repeating unit has a structure represented by Formula (II)

wherein R 1 is —Si(R 2 ) 3 ,

R 2 are independently C 1-6 alkoxy group, C 6-18 alkyl group, or C 6-22 alkenyl group, and at least one of R 2 is C 6-18 alkyl group, or C 6-22 alkenyl group; R 3 and R 4 are independently C 6-18 alkyl group, or C 6-22 alkenyl group; R 5 and R 6 are independently hydrogen, fluorine, methyl or ethyl; j is 3 to 7; and k is 1 to 30.

10. The microbial carrier as claimed in claim 8 , wherein the hydrophobic polyvinyl alcohol (PVA) has n number of first repeating units and m number of second repeating units, wherein n:m is 1:100 to 2:1.

11. The microbial carrier as claimed in claim 8 , wherein the first repeating unit is

wherein R 5 and R 6 are independently hydrogen, fluorine, methyl or ethyl; j is 3 to 7; and, k is 1 to 30.

12. The microbial carrier as claimed in claim 1 , wherein the crosslinking agent is C 1-9 aldehyde, aliphatic polyisocyanate, or a combination thereof.

13. The microbial carrier as claimed in claim 1 , wherein the crosslinking agent is formaldehyde, acetaldehyde, glyoxal, methylglyoxal, propionaldehyde, acrolein, malondialdehyde, butyraldehyde, valeraldehyde, glutaraldehyde, hexanal, heptaldehyde, benzaldehyde, anisaldehyde, cuminaldehyde or a combination thereof.

14. The microbial carrier as claimed in claim 1 , wherein the crosslinking agent is 2,4-toluene diisocyanate, 2,5-toluene diisocyanate, 2,6-toluene diisocyanate, hexamethylene diisocyanate, pentamethylene diisocyanate, isophorone diisocyanate, 4,4′-methylene dicyclohexyl diisocyanate, 4,4′-methylenediphenyl diisocyanate, or a combination thereof.

15. A device for treating wastewater, used to remove a pollutant from wastewater, comprising:
the microbial carrier as claimed in claim 1 ; and
a microorganism disposed on the microbial carrier.

16. The device for treating wastewater as claimed in claim 15 , wherein the pollutant is nitrogenous compound, organic matter, or a combination thereof.

17. The device for treating wastewater as claimed in claim 15 , wherein the microorganism is ammonia oxidation bacteria (AOB), anammox bacteria, heterotrophic bacteria, methanogenic bacteria, or a combination thereof.

18. The device for treating wastewater as claimed in claim 15 , wherein a pollutant removal rate of the device for treating wastewater is 50% to 96%, within 10 days for treating the wastewater with the device for treating wastewater.

Assignees

• Ind Tech Res Inst

Inventors

• Chang Ting-Ting
• Chang Kuan-Foo
• Chang Cheng-Chin
• Liu Yi-Chun
• Peng Mei-Chih

Classifications

• C02F3/108 Primary

  Immobilising gels, polymers or the like · CPC title

• C02F3/2806

  Anaerobic processes using solid supports for microorganisms · CPC title

• C02F3/302

  Nitrification and denitrification treatment (C02F3/308 takes precedence) · CPC title

• C02F3/307

  characterised by direct conversion of nitrite to molecular nitrogen, e.g. by using the Anammox process · CPC title

• C02F3/341

  Consortia of bacteria · CPC title