An Evaluation of Spatial Interpolation Techniques and the Selection the Most Suitable Method to Determine the Spatial Variability of Groundwater Quality Parameters: A Case Study of Mashhad plain, Northeastern Iran

Geosmin and MIB have been identified to be the major taste and odor-causing compounds in drinking water. Conventional treatment processes in water treatment plants, such as aeration, coagulation, flocculation, chlorination and/or ozonation, and adsorption have been found to be ineffective for removal of MIB/geosmin. The grassy or fishy odor is highly dependent on the enormous growth of algae in the warm months. In Kardeh dam reservoir, Geosmin is the major cause of odor in water. The main sources of the Geosmin in this reservoir are from entrance of the Urban and rural sewages, industrial wastewater, and agricultural effluents, that provides the nutrients for alga growth. Investigation of the numerous techniques shows that based on the technical and economic considerations a combined approach is the only effective procedure applicable for Kardeh Dam. In the combined procedure algae is removed first by using a combination of ultrasound waves and aeration by a super deep aerator in a biphasic water and air process. Then, final purification was done by adsorption in column filters containing coal and activated carbon in the overflow output Pulsators.