Nature Environment and Pollution Technology

S. Syed Enayathali ¹, V. Nehru Kumar ²

Affiliations
1 Department of Civil Engg., Annamalai University, Annamalainager, Tamil Nadu, IN
2 Centre for Environment, Health and Safety, Annamalai University, Annamalainager, Tamil Nadu, IN

Abstract

The laboratory model of two-stage Rotating Biological Contactor (RBC) which was used in the present study is a modified one, with a provision to vary the speed of rotating blades. Grey wastewater was used to study the performance of the modified rotating biological contactor. The reactor had four rotating blades in each stage, having the size of 300mm × 100mm × 10mm, attached perpendicular to the shaft. The experiment was conducted for different influent COD loads and different speeds of rotating blades. Among the different speeds of rotational blades in treating grey water, the rotational speed of 3 rpm was found to yield better percent removal of COD at 95.85% as maximum, whereas against the rotational speeds of 4.5 and 6 rpm, the treatment efficiency is 92.15% and 90.90% respectively.

Keywords

Rotating Biological Contactor (RBC), Grey Water, COD Removal.

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B. Asha ¹, V. Nehru Kumar ¹

Affiliations
1 Deptt. of Civil Engineering, Annamalai University, Annamalainagar-608 002, T.N., IN

Abstract

Diphasic anaerobic digesters have inherent advantages of exclusive process controls on the growth of microorganisms independently in acidogenic and methonogenic phases. A laboratory model of 15.0 liter effective volume with 2.5 liter of acidogenic reactor and 13.5 liter of methonogenic reactor was used to characterize the treatability of distillery wastewater. The model was run for varying concentrations of COD and influent rates to study the effect of organic loading rate in reducing the COD into harmless end products. The COD removal efficiency was found to vary from 17.67 to 26.19 % for varying organic loading rate (OLR) from 41.06 to 2.903 kg COD/m³/d for acidogenic reactor and 58.28 to 77.42% for varying OLR from 6.317 to 0.396 kg COD/m³/d for methanogenic reactor. The overall maximum COD removal was observed for 82.30% at an OLR of 2.903 kg COD/m³/d.

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D. Selvakumar ¹, V. Nehru Kumar ¹

Affiliations
1 Department of Civil Engineering, Annamalai University, Annamalai Nagar-608 002, T.N., IN

Abstract

A laboratory model of rotating biological contactor 10.125 litres of effective volume with three stages and a clarifier arrangement in the last stage was used. Synthetic effluent streams of sugar and dairy were used for treatability evaluation, in terms of COD removal under varying influent flow rate, influent COD and rotational speeds of the discs. The COD removal was found to vary from 72.93% to 91.66% under varying hydraulic loading rates of 0.039 to 0.133 m3/m2/day in the case of sugar effluent for the disc rotational speed of 6 rpm, and 67.95 to 87.57% under similar conditions for dairy effluent.

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