Nitrogen and Sulphate removal from Jawahar Lal Nehru Canal water by Floating Treatment Wetlands in monoculture and mixed culture

Monika Kumari, Vinay Kumar, Bindu Sharma

Abstract


Floating constructed wetlands also named Floating treatment wetland (FTWs) is a passively working eco-technology presently gaining popularity for their nutrient remediation efficiency from various types of water/wastewater. This study was conducted to find how the FTWs installation influences the physicochemical properties of Jawahar Lal Nehru (JLN) canal water in a mesocosm scale experiment. The mesocosm tanks were supplied with raw water from the sedimentation tank of Kalka Water Works (Rewari). Mesocosm experimental treatments include a control without FTWs; two monoculture plantings (each planted with plant species Typha angustata and Canna indica); one mixed planting (with both Typha and Canna sp.) Plants were supported by poly styrofoam and bamboo shoots network raft.  The study was conducted for five months and includes a total of 11 batches, each with an HRT of 7 days. Changes in physicochemical properties of water were evaluated after a 7- day HRT in the mesocosm treatment system. Mean TDS concentration in control as well as in all three FTWs mesocosms was slightly higher than influent loaded. The mean pH value was not showing any significant change in all four experimental sets. Mean percentage removal efficiency for N (nitrite-N and nitrate-N) was 28%, 61.6%, 69.7%, and 70.5% for control, FTWs with Canna, Typha and mixed FTWs respectively. FTWs showed a statistically significant difference in N removal in mesocosms than in control. Mean percentage removal efficiency for Sulphate was -8.22 %, -3.87 %, -6.23% and- 4.21% for control, FTWs with Canna, Typha and mixed respectively. The mean percentage removal efficiency for sulphate showed negative results for control as well as FTWs treatments even though FTWs are performing better than control.


Keywords


Jawahar Lal Nehru Canal, Rewari, TDS, pH, physicochemical properties, Typha, Canna

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