Metropolitan water tank pollution monitoring and purification using PID control

Normal water contains particulate matter including suspended particles, parasites, bacteria, algae, viruses, fungi and a range of dissolved and particulate material derived from the surfaces, that water may have made contact with after falling as rain. This contaminates water for household and drinking purposes. Utilization of such water has a potential to cause water borne diseases like, cholera and diarrhea. We have developed purification system using proportional-integral-derivative (PID) controller at water storage tank in metropolitan cities, which helps in controlling pH of water, clarity and presence of microorganisms in water. We used alum treatment followed by filtration for clarity, UV treatment and chlorine for disinfection and acetic acid/alum, soda ash for pH control.