Changing Water Quality of Jalangi River

The river waters of Jalangi got polluted at its downstream stretch at Krishnanagar due to municipal waste discharge as well as mixing of industrial effluent. Jalangi river water has now been upgraded to usable condition for outdoor bathing after drastic sewage treatment by chlorination for disinfection of faecal coliform bacteria as well as using screen and sedimentation tank for the precipitation of different solids remained in the domestic sewage at the outlets of eight drains of Krishnanagar municipality. The water quality rating applying the values of water quality index shows 60% good and 40% fair conditions of surface water of Jalangi River for the months from January to May 2020 which was almost poor during 2013–14 and 2014–15 respectively. Application of modified standard values of individual parameters for the computation of WQI results in the appropriate WQI values reflecting the proper concentrations of physicochemical parameters of river waters of Jalangi.