Abstract
In septic tanks, various types of toxic and non-toxic gases are found such as Carbon-di-Oxide (CO2), Carbon-mono-Oxide (CO), Hydrogen Sulfide (H2S), Methane (CH4), and so on. In this paper, a toxic gas detection system for a septic tank has been presented, where MQ-135, MQ-136, MQ-4, and MQ-7 sensors are employed for combined detection of CO2, H2S, CH4, and CO gases respectively. With the change of concentration of gases, the sensor resistance changes, and accordingly an analog voltage is produced across the sensor. The analog voltages from the sensors are fed to a microcontroller, which reads the values and converts the values into gas concentration in PPM (parts per million). The PPM values for all four gases are displayed on an LCD, where two levels are assigned as “Safe” and “Danger” based on the concentration of each gas. “Safe” status means the concentration of gas is not harmful and “Danger” status means the concentration of gas is harmful. A buzzer will give an alarm when the gas concentration status becomes “Danger”. Furthermore, a Bluetooth device is interfaced with the microcontroller for transferring the gas concentration data to a smartphone. For the Smartphone, application software has been developed to monitor the concentration of each toxic gas. The prototype system has been developed and tested which gives satisfactory results. It is supposed to be a helpful and cost-effective system for cleaners working in septic tanks.
Highlights
A septic tank is an underground chamber made of concrete, fiberglass or plastic (Septic tank, 2020) which is a submerged sedimentation tank utilized for the fundamental treatment of homegrown wastewater streams with the cycle of natural decay and drainage shown in Fig 1 (Water Disposal Hub, 2016)
The input unit consists of four sensors (MQ-136, MQ-135, MQ-4, and MQ-7) which are used for data collection
A microcontroller-based gas detection system has been presented. This system can deal with quick recognition of harmful gases that exist in the septic tanks
Summary
A septic tank is an underground chamber made of concrete, fiberglass or plastic (Septic tank, 2020) which is a submerged sedimentation tank utilized for the fundamental treatment of homegrown wastewater streams with the cycle of natural decay and drainage shown in Fig 1 (Water Disposal Hub, 2016). Are available in the septic tank which can be destructive to people especially cleaners, and can bring about an explosion. Even they can cause organ harm, lung damage, adverse symptoms, or even death (Healthline, 2019; Safeopedia, 2018). The primary sign of sewage gases in a zone could be observed with the smell of spoiled eggs (Safeopedia, 2018)
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