Pollution Research Paper

Vol 34, Issue 3, 2015; Page No.(619-627 )

OPTIMIZATION OF TRICKLING BIO FILTER AT DIFFERENT WATER FLOW RATES AND FILTER MEDIA THICKNESSES

VIVEK SHRIVASTAVA, A.K. VERMA, CHANDRA PRAKASH AND S. DAM ROY

Abstract

The efficiency of Trickling bio filter varies with type of filter media, filter media thickness and water flow rates. Two types of filter media viz. Charcoal and Molluscan shell with different thicknesses (10, 15 and 20 cm) at varied water flow rate (6, 8 and 10 L min-1) were used for experiment. A recirculatory assembly prepared with the components FRP conico-cylindrical jars (upper diameter 60cm, lower diameter 45 cm and depth 60 cm) used as filter chambers, emented tanks of (155*100*65 cm) used as water reservoir and an electric motor (0.5hp) for recalculating purpose was used. Water flow rates were regulated by gate valves. The total experimental period was of 180 days in which, three experiments were conducted. During 1st experiment (60 days), media thickness kept at 10 cm having flow rates of 6, 8 and 10 L min-1, which were intermittently changed by regulated valves at every 15 days interval. In 2nd experiment, media thickness of filter media was increased from 10 to 15 cm and flow rate was kept the same (6, 8 and 10 L min-1) as in 1st experiment. Further for 3rd experiment, filter media thickness was increased from 15 to 20 cm and flow rates was kept the same like that of 1st and 2nd experiment. Water quality parameters viz. ammonia, nitrite, nitrate, phosphorus, dissolve oxygen, pH and temperature were observed at different combination of filter media thicknesses and water flow rates. Optimum value for ammonia and nitrite was found in molluscan shell treated group at 20 cm media thickness and 10 lmin-1 flow rate compared to other media thickness and flow rates, optimum value of nitrate and dissolve oxygen observed in charcoal treated group and molluscan shell treated group respectively at 20 cm media thickness and 8 lmin-1 flow rate compared to other media thickness and flow rates. Phosphate value was found suitable in molluscan shell treated groups at 10 cm thickness and 8 lmin-1 flow rate while optimum value of temperature was found at 20 cm thickness and 8 L min-1 flow rate. Hence 20 cm filter media thickness was found most suitable to optimized a trickling bio filter with a flow rate of 6 or 8 l min-1 in molluscan shell filter media.

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