The Present research deals with the detection of hydrogen sulphide a malodorous and subsequent removal of the gas by using bi sulphide ion consuming photosynthetic bacteria for the treatment of household sewage water. The detection of the hydrogen sulphide is estimated by using methylene blue method. The gas hydrogen sulphide is the cause of many health effects especially is combination with ammonia which is estimated to be the maximum in concentration in household sewage water. The ammonia is removed by a chemical method followed by the removal hydrogen sulphide gas by the biological method. Hydrogen sulphide and ammonia are most commonly seen malodorous gases encountered during sewage water treatment. Ammonia gas is found in almost all household sewage water in the maximum concentration. This gas in combination with the other gases released during treatment or accumulation of sewage waste water shows a greater impact on the health of human compared to individual gases. Odour emitted by wastewater treatment is an indication of an anaerobic process. Early stages of processing leads to the formation of toxic gases, like Hydrogen sulphide (H2S), Sulphur dioxide (SO2), Bromine, Chlorine and oxides of nitrogen. Malodorous gases require gas phase filters prior to exhausting from irrigation tanks. Detection and removal of hydrogen sulphide gas from food sewage water collected from Vellore was achieved within 15 days.
