Disinfection of Groundwater by Modified Shallow Water Hand Pump using Hydrodynamic Cavitating Technique

The Waterborne diseases are major concern in rural areas due to lack of pathogens free water. Groundwater is main source of drinking water in rural areas of India, hand pumps are widely used medium to exploit groundwater. Existing water treatment technologies at household level are not feasible for low-income family. Direct consumption of pathogenically contaminated groundwater leads to various diseases such as Cholera, Diarrhoea, Typhoid etc. In Gorakhpur and nearby districts of Gorakhpur use of shallow water hand pumps are very common for groundwater exploitation. In this research work we modified the shallow water hand pump using hydrodynamic cavitating techniques to achieve disinfection. It is found that groundwater bacterial population varies frequently with seasons and locations, 500 to 700 CFU/ml is average bacterial count found in groundwater drawn from shallow water handpump in campus of Madan Mohan Malaviya University of Technology, Gorakhpur. Experiments were conducted on shallow water handpump installed in chemical engineering department building with cavitating device (orifice). Different configuration of orifice was used in study, maximum 70% disinfection were achieved by orifice with 95 holes of 1 mm diameter each.