PHYTOREMEDIATION EFFECT IN DAIRY WASTE WATER AND DOMESTIC WASTE WATER USING CONSTRUCTED WETLANDS OF AZOLLA PINNATA

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Neethu V.C. Chinnamma M.A.

Abstract

Water pollution is one of the major environmental issues in the present scenario. Increased population and industrialization fasten the water pollution rate. Every day, dairy industries produces large amount of waste water during processing. Increase in population leads to high domestic water consumption and domestic waste water production. Domestic waste water also plays an important role in polluting water resources. In this study an attempt is made to assess effectiveness of phytoremediation technique using azolla pinnata plant over dairy waste water and domestic waste water by constructed wetland units. Parameters like pH, Turbidity, Total Dissolved Solids (TDS), Total Suspended solids (TSS), Chloride, Sulphate, Biochemical Oxygen Demand (BOD), Chemical Oxygen Demand (COD), Dissolved Oxygen (DO), Ammoniacal Nitrogen, Total Nitrogen (TN), Total Phosphorous (TP), were analyzed for the influents and effluents. Constructed wetlands over dairy waste water and dairy waste water observed with a high removal efficiencies in all tested parameters except pH and DO. Comparative study showed that removal efficiency of parameters like Turbidity (99.42%), TDS (91.30%), BOD (98.37%) and COD (97.53%) were slightly greater for dairy waste water wetland unit. Removal efficiency of parameters like Chloride (88.53%), Sulphate (92.87%), TN (80.56%), TP (94.93%) and Ammoniacal nitrogen (91.12%) were greater for domestic waste water. TSS removal efficiency is 100% for both systems. After 28days of detention period both constructed wetland units produced, good quality effluents that can be reused and recycled for non-potable purposes. Remarkable yield of azolla pinnata is an added advantage of this system.

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