National Academy of Agricultural Sciences (NAAS)
|
PRINT ISSN : 2319-7692
Online ISSN : 2319-7706 Issues : 12 per year Publisher : Excellent Publishers Email : editorijcmas@gmail.com / submit@ijcmas.com Editor-in-chief: Dr.M.Prakash Index Copernicus ICV 2018: 95.39 NAAS RATING 2020: 5.38 |
An investigation has been carried out to develop a biological treatment technology for the removal of odourous compounds from domestic sewage water. Under aerobic condition, free molecular oxygen is used by microbes as electron acceptor and produce water. Under anaerobic condition, if neither oxygen nor nitrate (NO3-) is present, microbes tend to use sulphate (SO42-) as electron acceptor and generate volatile H2S. Thus cause odour problem. The usual practice adopted by many sewage treatment plants is vigorous aeration. The oxidation of H2S under highly aerobic condition generates sulphuric acid. But, a group of sulphur bacteria oxidize H2S into elemental sulphur without producing sulphuric acid. This elemental sulphur is not used by sulphate reducing bacteria. Thus disrupts the cycle by arresting the formation of H2S. In our study Acidithiobacillus ferrooxidans and Acidithiobacillus thiooxidans (5 % v/v) in combination played a perfect role in oxidizing the H2S into elemental sulphur thus it prevents odour formation from sewage water. The activity of microbes will be more during summer and they might require more oxygen. The increase in microbial activity would deplete the oxygen and makes the bacteria to look for an alternative oxygen source alleviate an odour problem. Thus, planting tree species like Terminalia arjuna, Millingtonia hortensis, Hibiscus tiliaceus and Melia dubia across the sewage drain/sewage lagoon would keep the sewage system aerated and support the microbial growth and thereby solve odour problem.
Citations |
 |
 |
 |
 |
