Method of treating cellulose containing waste water sludge for the manufacture of linerboard and cellulosic ethanol production

Patent metadata

Field	Value
Publication number	US-9896358-B2
Application number	US-201615186608-A
Country	US
Kind code	B2
Filing date	Jun 20, 2016
Priority date	Jun 20, 2016
Publication date	Feb 20, 2018
Grant date	Feb 20, 2018

Abstract

The current process relates to the treatment of a primary sludge that is produced from waste water treatment facilities such as a pulp mill or a pulp and paper mills. It further relates to a process of using the primary sludge in the production of cellulosic ethanol. It further relates to the use of the treated primary sludge in the manufacture of recycled linerboard.

First claim

We claim:

1. A process for preparing a primary sludge, to be used in the manufacture of cellulosic ethanol, from industrial water effluent, including the step of treating the effluent with a chemical composition comprising benzalkonium chloride; sodium hypochlorite; and oxytetracycline.

2. The process according to claim 1 , wherein the solids of the primary sludge comprises at least 20% by weight of cellulosic fiber, can comprise at least 30% by weight fiber and may comprise at least 40% by weight cellulosic fiber.

3. The process according to claim 1 , wherein the chemical composition is added to the effluent stream in an amount of from about 100 ppm to about 1,000 ppm.

4. The process according to claim 1 , wherein the primary sludge is at least 40% by weight total solids.

5. The process according to claim 1 , wherein the amount of benzalkonium chloride relative to the total actives is from 40-75%, the amount of sodium hypochlorite is from 8-20% and the amount of oxytetracycline is from 0.1-1%.

6. The process according to claim 1 , wherein the chemical composition is added to the effluent stream prior to a filter press.

7. The process according to claim 1 , wherein the chemical composition is added to the industrial effluent stream at the filter press.

8. The process according to claim 1 , wherein the bacterial count in the primary sludge is less than 100,000.

9. The process according to claim 1 , wherein bio-organism activity in the aeration pond is unaffected by the chemical composition.

10. The process according to claim 1 , wherein the industrial effluent stream is from a pulp mill or a pulp and paper mill.

11. A process for preparing cellulosic ethanol comprising preparing a primary sludge from industrial effluent stream, as defined in claim 1 , and using the resulting primary sludge in the production of ethanol.

12. The process according to claim 11 , wherein the solids of the primary sludge comprises at least 20% by weight cellulosic fiber.

13. A process for preparing a primary sludge, to be used in the manufacture of recycled linerboard, from industrial waste effluent, including the step of treating the effluent with a chemical composition comprising benzalkonium chloride; sodium hypochlorite; and oxytetracycline.

14. The process according to claim 13 , wherein the solids of the primary sludge comprises at least 20% by weight cellulosic fiber.

15. The process according to claim 13 , wherein the chemical composition is added to the waste effluent stream in an amount of from about 100 ppm to about 1000 ppm.

16. The process according to claim 13 , wherein the amount of benzalkonium chloride relative to the total actives is from 40-75%, the amount of sodium hypochlorite is from 8-20% and the amount of oxytetracycline is from 0.1-1%.

17. The process according to claim 13 , wherein the chemical composition is added to the industrial effluent stream prior to the filter press.

18. The process according to claim 13 , wherein the chemical composition is added to the industrial effluent stream at the filter press.

19. The process according to claim 13 , wherein bio-organism activity in the aeration pond is unaffected by the chemical composition.

Assignees

• Solenis Tech Lp

Inventors

• Pereira Fabricio Saab
• Gomes Adriano Marques

Classifications

• C02F11/12

  by de-watering, drying or thickening · CPC title

• D21H21/36

  Biocidal agents, e.g. fungicidal, bactericidal, insecticidal agents · CPC title

• D21F1/66

  Pulp catching, de-watering, or recovering; Re-use of pulp-water · CPC title

• D21H11/14

  Secondary fibres (working-up waste paper D21C5/02) · CPC title

• C07C29/00

  Preparation of compounds having hydroxy or O-metal groups bound to a carbon atom not belonging to a six-membered aromatic ring · CPC title