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Abstract
The wood charcoal treated by 1N HNO3 (WCT) was used to remove toxic chlorinated pesticide lindane (γ‐HCH) residue from water by the sorption process. The continuously mixed batch reactors (CMBR) were used to study the effect of system parameters, such as initial sorbate concentration, sorbent size, and sorbent dose on the sorption equilibrium time of lindane by WCT. Using a rational approach an appropriate value of the equilibrium time was determined. The assessed equilibrium time from such an approach was found to be less than the value obtained by rough estimate which is commonly adopted in practice. The co‐solutes or co‐sorbates, such as DDT and pentachlorophenol (PCP) imparted a marked decrease in sorption of lindane, whereas trichlorophenol (TCP) did not affect the removal pattern. WCT showed a preferential sorption of (i) DDT > lindane > α‐HCH > β‐HCH and (ii) PCP > lindane > TCP. At a concentration ≥ 20 mg/l of fertilizers, both urea and single super phosphate (SSP) significantly affected the removal of lindane. However, the effect was relatively higher by SSP than by urea.
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Ex‐Research Scholar
Professor, Civil Engineering Department.