Development of composite radial filter for recharging aquifer with runoff from agricultural field
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Date
2021
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Punjab Agricultural University, Ludhiana
Abstract
A lab scale model of composite radial filter was designed, fabricated and developed
for the removal of N, P and K in runoff water from rice field for recharging aquifer. Zeolite
(Z), charcoal activated (C), coarse sand (CS) and gravel (G) filter materials were placed in
annular concentric rings of composite radial filter in different combination of thickness, viz.
1:2:4:4, 1:3:4:4, 1:2:2:4, 1:3:2:4 and 0:2:1:2 for treatments T1, T2, T3, T4 and T5 respectively.
Sodium hypochlorite solution was injected at the rate of 0.1 ml per unit discharge (lps) by
using chlorination unit at the outlet of the radial filter to remove bacteriological contamination
of filtered water. The performance of composite radial filter was evaluated by analyzing
runoff water samples before and after filtration for four inflow rates viz. 0.42, 0.82, 1.24 and
1.66 lps. The value of NO3-N, P2O5 and K2O of filtered water was found to be within
permissible limit at all flow rates. The T5 treatment consisting of filter materials C, CS and G
with thickness of 20, 10 and 20 cm (2:1:2) respectively was found to be the best compared to
the other four treatments (T1, T2, T3 and T4) on basis of N, P2O5 and K removal efficiency and
lowest cost price. The removal efficiency of NO3-N and P was found to be about 80 % after 5
hours of filtration from T5 treatment while K2O removal efficiency was low about 65 % after
half an hour of filtration. The filter materials were washed after 5 hours of filtration and
reused in composite radial filter for filtration. The value of NO3-N, P2O5 and K2O of filtered
water from reused filter media after washing was found to be 5.3, 5.8 and 10.9 ppm
respectively which are slightly more than value obtained from the initially fresh filter
materials for same time of operation.
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Citation
Hansra, Gursharan Deep Singh (2021). Development of composite radial filter for recharging aquifer with runoff from agricultural field (Unpublished M.Tech. thesis). Punjab Agricultural University, Ludhiana, Punjab, India.