Odor, Corrosion and grease

Odor Control - H2S Reduction

Elevated H2S (hydrogen sulfide) levels are the cause of the odors generally associated with sewers. Hydrogen Sulfide is a colorless, very flammable gas. In low concentrations it smells like “rotten eggs”. However the sense of the smell is lost after 2-15 minutes of exposure making it impossible to smell dangerous concentrations. It is heavier than air and it is considered to be a very toxic gas. When H2S burns it produces another very toxic gas – Sulfur Dioxide (SO2).
Because of an oxygen-deprived environment, bacteria found within sewage systems produce H2S. Typically H2S is found in slow flowing sewers or pumping stations with long storage times. H2S can develop from sewage deprived of oxygen in as little as 25 minutes.

The PNW designed Air Injection System (AIS) provides the required oxygen to keep sewage aerobic and therefore prevent the production of H2S and associated noxious odors.

Minimize Sewer and Infrastructure Corrosion

A wet, humid environment with the presence of H2S and oxygen is an excellent environment for the chemical reaction producing sulphuric acid to occur (similar scenarios in nature are the acid rains). None as one of the most powerfull acid, sulphuric acid (H2SO4) generally leads to corrosion, and breakdown of concrete pipe, manholes and cast iron manhole lids. Others conditions such as warm temperature, lack of oxygen (produces more H2S), and high-strength sewage contribute to the rate and extent of corrosion.

PNW provide system abble to decrease the amount of H2S in your sewer, resulting in reduced corrosion levels.

Grease Control

Oil and grease in the wastewater cause trouble by accumulating in the collection system pipes (sewers, pumping stations & equipment). It decreases pipe capacity and oxygen level, generating an oxygen-deprived environment causing H2S to develop. By reducing and preventing grease build-up, H2S production can be reduced or eliminated.

PNW propose a bioaugmentation program using Bacta-Pur® XLG that removes the accumulated grease in the collection system, which reduces the formation of H2S and also improve the pipes capacity. The Bacta-Pur product contains a community of natural beneficial microorganisms, which have been selected for their synergistic ability to produce all essential enzymes for fat and grease digestion.