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Tertiary Treatment of Secondary Effluent of the Pharmaceutical Company - Design of Aerated Lagoon

Author(s):

Prof. Dr. K N Sheth , Director, Faculty of Management, SSESGI, Rajpur, Gujarat, India; Pritesh, PG Student of Environmental Engineering, ISTAR, Vidyanagar (Gujarat)

Keywords:

Tertiary Treatment, Aerated Lagoon, Kinetic Coefficients, BOD, COD

Abstract

A pharmaceutical company in Panoli manufacturing bulk drug needs tertiary treatment to bring the effluent for the desired standards in accordance with the norms given by Gujarat Pollution Control Board. An attempt has been made to design most economical tertiary treatment for secondary effluent of the pharmaceutical company. Subsequent to the detailed analysis of the secondary effluent, it was found that BOD value was high compared to the norms given by the board. Considering the space constraint, aerated lagoon was the option available. An attempt has been made to determine the biological co-efficient in the M/S. Jyoti Om Chemical Research Centre, (lab) Ankleshwar by carrying out characterization and treatability studies. The characterization and treatability studies encompasses of determination of the analysis raw effluent as well as quality of secondary treated effluent continuously for three months. During the monitoring, samples were collected from equalization tank and V-notch chamber for raw effluent and secondary treated effluent respectively. The experiments for treatability studies were carried out in batch reactor and reduction for BOD & COD were recorded. The results were found very encouraging and therefore it was found during the investigation that aeration system without recycling of biomass is sufficient to bring the standards below the prescribed limits by the competent authority. This gives the idea that aerated lagoon system of treatment will be suitable. Many batch type experiments have been carried out to determine the biological co-efficient associated with aerated lagoon in the lab studies. The average BOD removal rate constant, K; maximum rate of substrate utilization, k; the maximum yield co-efficient, Y; endogenous decay co-efficient, kd; the average detention time and half velocity constant in aerated lagoon system were found to be 2.186 d-1, 3.92 L/mg . d-1, 0.60 mg of VSS/mg of BOD5,20 removed, 0.070 d-1; 6.5 d and 269 mg/L respectively. Based on biological constant, aerated lagoon proposed to be total two tanks, each sizing 13 m x7.5 m x 3.5 m (liq. Depth) with 0.6 m free board (F.B.) with a blower (1+1) having capacity of 3 m3/min of air flow.

Other Details

Paper ID: IJSRDV5I40189
Published in: Volume : 5, Issue : 4
Publication Date: 01/07/2017
Page(s): 202-206

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