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Control of bacterial activity, such as in sewers and wastewater treatment systems

A sewer and bacteria technology, applied in the direction of oxidation water/sewage treatment, water/sludge/sewage treatment, sterilization/microdynamic water/sewage treatment, etc., can solve the problem of reduced pipeline flow area, increased energy consumption, water flow and Increased pipe wall friction, etc.

Inactive Publication Date: 2013-02-20
THE UNIV OF QUEENSLAND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The presence of biofilms in sewer pipes has at least 3 undesired side effects, these are (1) microorganisms in biofilms are somewhat protected from the main flow of liquid through the sewer; The flow area of ​​the pipe decreases, and (3) the friction between the water flow and the pipe wall increases, thereby increasing the energy consumption

Method used

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  • Control of bacterial activity, such as in sewers and wastewater treatment systems
  • Control of bacterial activity, such as in sewers and wastewater treatment systems
  • Control of bacterial activity, such as in sewers and wastewater treatment systems

Examples

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Embodiment Construction

[0044] The present invention arose from experiments carried out by the inventors on the effect of nitrite on sulfate reducing bacteria. Nitrite has long been recognized as a metabolic inhibitor of sulfate-reducing bacteria (SRB). It acts on dissimilatory sulfite reduction (dsr) enzymes by blocking the reduction of sulfite to sulfide.

[0045] In studies conducted by the inventors involving continuous addition of nitrite to sewage systems, denitrification (heterotrophic and autotrophic) occurred several days after the start of continuous nitrite application. Denitrification produces a high pH (8-9) in the sewer reactor. The increase in pH correlated with the concentration of nitrite applied. The inventors observed that the nitrite inhibition efficacy was reduced by high pH. Based on this observation, the inventors hypothesized that the potency of nitrite is related to the pH of the sewage. At lower pH, the inventors hypothesized that nitrite might be better at controlling s...

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Abstract

A method for controlling the activity of sulfate reducing bacteria or methanogenic archaea (or both) in environments containing such organisms comprises treating the environment with free nitrous acid (HNO2) or with a solution containing nitrite (NO2 -) having a pH of less than 7 or by adding nitrite to the environment and having a pH of less than 7 in the environment. The method can also disrupt biofilms.

Description

field of invention [0001] The present invention relates to a method for use in a culture comprising sulfate-reducing bacteria and / or methanogenic archaea (in some literature, methanogens have been incorrectly referred to as methanogens, which are also included in this patent) or both. methods of controlling the activity of such organisms in their environment. In some aspects, the invention relates to methods for controlling the activity of sulfate-reducing bacteria and methanogenic archaea (or both) in a sewer or wastewater treatment system. The invention also relates to methods for treating or controlling biofilms in sewers. Background of the invention [0002] Sulfate-reducing bacteria and methanogenic archaea (also known as methanogens) are species found in a wide range of environments including oceans, sediments, hot springs, oil reservoirs, UASB reactors, sewers, and wastewater treatment systems. microbiome. Their presence in sewer networks and other wastewater treat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A01N59/00A61L101/22C02F1/50A61L2/18B08B9/027C02F1/72A61L101/20
CPCC02F1/72C02F1/50C02F2209/06C02F2303/02C02F3/30B08B17/00A01N59/00C02F2303/04C02F2303/08C02F2307/14A01N2300/00
Inventor Z·袁G·江O·古铁雷斯加西亚-莫雷诺
Owner THE UNIV OF QUEENSLAND
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