Sewage Exhaust Treatment

Ozone in STP Exhausts

The problem of bad-smelling odours emanating from sewer treatment plants is turning out to be one of the most serious problems related to the operation of the same, especially when they are located within a residential environment.

Causes of odors
The substances responsible for odours into sewage treatment plants are:
• inorganic products
• highly volatile organic compounds.

Compounds responsible for odors
• Mercaptans
• Skatoles
• Indoles
• Inorganic acids
• Aldehydes
• Ketones
• Organic compounds containing nitrogen or sulphur atoms (all originate from the anaerobic decomposition of compounds with a greater molecular weight, especially the proteins)
• Among the inorganic compounds, ammonia and sulphuric acid are considered to be the main cause when the sewage comes from mainly household origins because of putrefactive phenomena in reducing environments, leading to generation of H2S and other smelling by-products.

OZONE, with the chemical formula O3, is a highly reactive gas (oxidiser), for which the instability is useful since during the subsequent decomposition process, its oxidising action is exerted on the organic and inorganic substances, bacteria, viruses, spores, etc. It implements additive, ozone analysis and catalytic mechanisms. With regard to bacteria and viruses, it acts through a catalytic oxidation of the proteins, brutally destroying their structures (ANTI-MICROBIC ACTION). For what concerns the organic and inorganic substances, it acts on the groups which bear the odours using an oxidising action due to the atomic oxygen or through the information of unstable compounds (ozonids) which break-up the molecules as they decompose (DEODORISING ACTION). Ozone produces no harmful by-products since all components are either oxidized to carbon- dioxide and water or precipitated out. Main by- product of ozone is oxygen.