A restorative bioremediation study Of threatened lakes in peri urban Areas of chennai

Abstract

The present study aims at the sustainable development of water newlinebodies by sampling and analysis of water quality of various lakes in and newlinearound Chennai city. The experiment was carried out to check total newlinephosphorus, chlorophyll and Secchi depth to calculate the Trophic State newlineIndex (TSI) by collecting water samples during various seasons. The newlineresults were used to classify the lakes according to TSI. Fifteen lakes were newlineselected, and samples were collected during rainy, winter and summer newlineseasons. Seasonal fluctuations in the parameters like Total phosphorus, newlineSecchi depth, Chlorophyll-a were analysed. Based on the parameters CTSI newline(Carlson s Trophic State Index) was calculated for each lake and newlineaccordingly lakes were classified. The CTSI values in this study ranges newlinebetween 39 and 84. Among the selected lakes many were classified as newlineeutrophic and hyper eutrophic based on CTSI value. Lakes Chetpet and newlinePorur are classified as oligotrophic and mesotrophic respectively. The newlineseasonal fluctuations in the trophic state of lakes from oligotrophic to newlinemesotrophic would be helpful for policy making and lake restoration newlineprogrammes. Water quality of many lakes in Chennai is deteriorating due newlineto fast urbanization and industrialization. newlineix newlineThis study also aims to assess physico-Chemical characteristics of newlineVelachery Lake for effective eco management of the lake. Water samples newlinewere collected during the post monsoon season. The sampling and newlineanalytical methodologies were followed for the estimation of selected newlineparameters as per Standard methods of water and wastewater analysis newline(APHA 2005). This study further investigates the growth of micro algae newlineChlorella vulgaris in Velachery Lake water and the reduction of pollution newlineat the end of growth phase. The biomass density, biomass productivity and newlinethe lipid content were estimated as, 0.722±.028 g/l,.0589g/l/d, 21±.06 % newlinerespectively. The results brought to light that polluted lake water as a costeffective newlinegrowth medium can be utilised to augment biomass production, newlinesimultaneously inducing cons