Nature Environment and Pollution Technology

M. Manimegalai ¹, S. Binu Kumari ¹

Affiliations
1 P. G. and Research Department of Zoology, Kongunadu Arts and Science College, Coimbatore-641 029, T. N., IN

Abstract

The plant extract of Tagetus erecta and Cymbopogon citratus were evaluated for ovicidal and repellent activities against Aedes aegypti. The egg hatchability was observed after 24 hour exposure. 100% ovicidal activity was observed at 5.5% and 3.0% respectively. Skin repellent test at 0.25, 0.5, 0.75 and 1.0 mg/cm² concentration gave 100% protection upto 4.0, 4.5, 5.0, 5.5 and 6.0 hrs respectively. From the present study it was revealed that extracts from Tagetus erecta and Cymbpogon erecta can be effectively used in the control of Aedes aegypti.

Keywords

Botanical Extracts, Tagetus erecta, Cymbopogon citratus, Aedes aegypti, Ovicidal Effects, Repellent.

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S. Binu Kumari ¹, K. Priyatharshini ¹, M. P. Julie ¹, M. Manimegalai ¹

Affiliations
1 Department of Zoology, Kongunadu Arts and Science College, Coimbatore-641 029, T. N., IN

Abstract

Samples of well waters in the area around a paper mill industry situated at Udumalpet, Tamil Nadu were collected and analysed for physicochemical characteristics to assess the water quality during the period of six months of pre-monsoon season (June-November 2008). The data show that the quality of groundwater is grossly polluted and not suitable for drinking and irrigation purposes due to presence of high solids and electrical conductivity.

Keywords

Groundwater Quality, Paper Mill Industry, Drinking Water, Irrigation Water.

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S. Binu Kumari ¹

Affiliations
1 Department of Zoology, Kongunadu Arts and Science College, Coimbatore-641 029, T.N., IN

Abstract

Adsorption as a water and wastewater treatment process has aroused considerable interest during recent years. Activated carbon is most commonly used adsorbent. Dyeing effluents are highly toxic and unaesthetic, therefore, their treatment is mandatory prior to discharge. Hence, in the present work an attempt has been made to study the possibilities of employing tea waste, saw dust, rice husk, groundnut husk and walnut shell has bioadsorbents to improve the quality of dyeing effluents. The main parameters studied were pH, EC, TS, TDS, TSS, BOD, COD, calcium, magnesium, sulphate, chloride and sodium in both treated and untreated effluents. A decline in the levels of all these parameters were observed after the treatment.

Keywords

Waste Treatment, Dye Industry Effluent, Bioadsorbents, Batch Experiment.

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M. Manimegalai ¹, S. Binu Kumari ¹, K. Shanthi ¹, N. Saradhamani ¹

Affiliations
1 Department of Zoology, Kongunadu Arts and Science College, Coimbatore-641 029, T.N., IN

Abstract

Water quality plays an important role in the survival and distribution of aquatic organisms. It is dependent on physicochemical and nutrient parameters. Studies on the physicochemical characteristics of the Walayar reservoir were carried out for a period of one year from December 2006 to November 2006. The study was performed to determine the pollution status of the reservoir and to implement the measures of pollution control. The parameters analysed include the physical parameters such as temperature, suspended solids, dissolved solids and total solids. The chemical parameters were evaluated such as pH, DO, free CO₂, total alkalinity and nutrients such as calcium, magnesium, nitrate, phosphate, silicate, Iron, fluoride and chloride. The water quality of the Walayar reservoir was within the safe limits throughout the study period, which shows that this water is fit for utilization for irrigation, domestic purposes and also to support biodiversity.

Keywords

Limnological Studies, Walayar Reservoir Water, Quality, Nutrients.

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