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Groundwater is a vital resource in the northern region of Sri Lanka, as it is the only water resource used for domestic, agricultural and industrial activities in that area. However, due to excessive usage of synthetic fertilizer, the groundwater in this part of the country is highly contaminated with nitrates. In addition, due to the effect of underlain limestone aquifer, water hardness is also high. The present study aimed to study the effect of filtration through  Terminalia arjuna  mature leaf powder and  Phyllanthus emblica  bark powder on reducing nitrate concentration and hardness. The results indicated that 21.4% reduction of nitrate concentration can be achieved by filtration through  Terminalia arjuna  mature leaf powder and 9.3% reduction of total hardness by filtration through  Phyllanthus emblica  bark powder. Therefore, further research is recommended on testing the potential and side effects of using  Terminalia arjuna  mature leaf powder and  Phyllanthus emblica  bark powder as a combined home remedial treatment technique for treating nitrate contaminated hard water.

applied water science

Efficacy of Terminalia arjuna mature leaf powder and Phyllanthus emblica bark powder to reduce nitrate: N and total hardness in groundwater in karstified limestone aquifer