Aims: To evaluate the influence of aquatic plants and flow rate on physico-chemical properties of sewage effluent with constructed wetland technology. Study Design: Randomized block design Place and Duration of Study: Department of Environmental Sciences, Tamil Nadu Agricultural University, Coimbatore - 03 and June 2020 – Dec 2020 Methodology: Constructed wetland (CW) model was designed and three different aquatic plants viz., Canna indica, Arundo donax, and Xanthosoma sagittifolium were used for the study. Two different flow rates viz., 5ml/min and 10 ml/min were compared for assessing their influence in treating sewage effluent in the constructed wetlands. Results: Among the aquatic plants, the pollutants like BOD, COD,TDS and TSS in the sewage effluent were declined and found to be 320, 1220, 666, 22 mg L-1 in Canna indica and 340, 1380, 866, 36 mg L-1 in Xanthosoma sagittifolium and 340, 1380, 866, 36 mg L-1 in Typha angustifolia utilized treatments at flow rates 5 ml/min respectively during 7th day retention time. Similar decreasing trend was observed in BOD, COD, TDS and TSS of the sewage effluent at flow rates of 10 ml/min. Conclusion: Based on the study, it was evident that constructed wetland (CW) with Canna indica, Xanthosoma sagittifolium and Typha angustifolia found to perform better under flow rate of 5 ml/min for treating sewage effluent at the retention time of 7 days.
Sugar industry is the second largest agro-based industry in India, which contributes substantially to the economic development of the country. The distillery units mainly use sugarcane molasses as a preferred raw material and for every liters of alcohol production, 10-15 liters of waste water, known as spent wash, is generated which poses serious disposal problems. Field experiment was conducted to study the efficiency of Biomethanated distillery spentwash, on improving the yield and quality of Sugarcane at Research and Development farm of Bannari Amman Sugars Ltd., Modur, Sathyamangalamtaluk, Erode district, using Sugarcane, Co 86032 as a test variety with a spacing of 40cmx30cm. Application of 40KL + Biocompost (1.0 tonnes) (T 5 ) recorded higher yield of 76 t ha -1 , + NPK as per recommended dose (T1) recorded the lower yield of 53 t ha -1 .Increase in the rate of spentwash application markedly increased the Exchangeable Ca, Mg, Na, K concentration and relatively higher values were observed in soil that received 40kl spentwash with 1 tonnes of biocompost. Mineralization of organic matter and the nutrients present in the effluent are responsible for the increase in the availability of nutrients in soil.
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