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S. Manjappa ¹, B. E. Basavarajappa ¹, S. A. Gangaraju ²

Affiliations
1 Department of Chemistry and Environmental Science and Technology Study Centre, Bapuji Institute of Engineering and Technology, Davangere - 577 004, IN
2 Department of Civil Engineering, Bapuji Institute of Engineering and Technology, Davangere - 577 004, IN

Abstract

An attempt has been made to detect the fluoride levels in groundwaters in Davangere district by selecting about 300 bore wells, covering all the six taluks of the district. It is observed that fluoride level ranges from as low as 0.21 ppm in Davangere taluk to as high as 6.98 ppm in Harihar taluk. In this context, a study has been conducted to evaluate the real effect of abnormal content on the human beings of this region by correlating the data obtained from District Health Office (DHO). Further, the geological significance with reference to the fluoride occurrence has also been interpreted.

Keywords

Fluoride Levels, Groundwater, Davangere District, Karnataka.

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H. Karibasappa ¹, H. B. Aravinda ¹, S. Manjappa ¹

Affiliations
1 Department of Civil Engineering, Adhiyamaan College of Engineering, Hosur-635 109, T.N., IN

Abstract

The present concern for eutrophication relates to the rapidly increasing quantities of nitrogen and phosphorus which are otherwise present at fairly low concentrations in unmodified natural waters to limit the algal growth and biomass. In the present study an attempt has been made to measure the level of eutrophication in Hosur town lakes. Three lakes namely Chandrakudi lake, Doddan lake and Kelavarapalli dam were selected for the study. The samples were collected and analysed for soluble orthophosphate, chemical oxygen demand, organic nitrogen, free ammonia, inorganic nitrogen, total phosphorus and dissolved oxygen, etc. The onsite study like transparency, fish kill information and impairment of lakes, etc. was also conducted. The level of eutrophication in the lakes was calculated by using Wetzel's scheme. The results revealed that the eutrophication level in all the three lakes is very high, i.e., hypereutrophic to very eutrophic.

Keywords

Eutrophication, Nutrients, Nitrogen, Phosphorus, Hosur Town Lakes.

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M. Mamatha ¹, H. B. Aravinda ², E. T. Puttaiah ³, S. Manjappa ⁴

Affiliations
1 Department of Chemical Engineering, Bapuji Institute of Engineering and Technology, Davangere, Karnataka, IN
2 Department of Civil Engineering, Bapuji Institute of Engineering and Technology, Davangere, Karnataka, IN
3 Gulbarga University, Gulbarga, IN
4 Department of Chemistry, Bapuji Institute of Engineering and Technology, Davangere, Karnataka, IN

Abstract

In the recent years, Pongamia pinnata trees are widely grown at farms for its seeds utilised for biofuel activities. Due to the easy availability of this tree bark, it is used as a viable adsorbent for removing some heavy metals from aqueous and waste water. In this context, the adsorption of Zinc on prepared adsorbent is very effective. In this study, investigations were made for the adsorption of zinc ions from aqueous and waste water. Batch adsorption studies to determine the optimum conditions of zinc ion removal were conducted to know the influence of experimental conditions such as pH of the solution, metal ion concentration, amount of adsorbent and contact time at room temperature. The results obtained show that the optimum pH range for the zinc removal is 5 – 5.4 and adsorption percent is higher than 95 %. Kinetic study was also made to determine rate constants.

Keywords

Adsorbent, Adsorption Isotherms, Effluent, Kinetics, Pongamia pinnata, Zinc.

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