Remote Detection for the Presence of NH3, CO2, CH4, H2S, CO and Other Toxic Gases at Various Locations in a Sewer to Alert the User

Abstract

Sewer gasis a complex mixture of toxic and nontoxic gases produced and collected in sewage systems by the decomposition of organic household or industrial wastes, typical components of sewage. Sewer gases may include Hydrogen Sulphide, Ammonia, Methane, Sulfur Dioxide, Carbon Monoxide and Nitrogen oxides. This project aims to deliver a system that will be useful in detecting and alerting the user before getting exposed to the toxic gases accumulated inside the sewer. This project uses MQ-135 and MQ-4 sensors to detect various toxic gases such as NH3, CO2, CH4, H2S and CO. This project also has a water level detection sensor which is used to detect the level of water and to reveal any blockage present inside the sewer. These detected gases are measured using the unit “parts per million (ppm)”. It is then compared with the threshold values that have been fed earlier inside the controller. If the detected values are higher than the threshold value, then a warning is sent to the user along with the ppm values. If the detected values are lower than the threshold value, then only the ppm values are shown to the user without any warnings. This project stores the values recorded in a dedicated webpage. This is where the information from our system is displayed to the user.