Peat adsorption of herbicide 2,4‐D from wastewaters

Abstract

The possibility of utilizing peat as adsorbent for removal of the pesticide 2,4‐D from contaminated wastewaters has been evaluated in this investigation. Batch tests were conducted at different conditions of initial solute concentration, pH, particle size of adsorbent, temperature and ratios of weight of adsorbent to solution volume, in order to determine the optimum range of these variables for the adsorption operation. Removal ratios for the 2,4‐D of the order of 90% were obtained under optimum conditions. The adsorption of 2,4‐D in peat is described adequately by the Freundlich isotherm. Continuous tests, utilizing adsorption columns, were then conducted in order to determine the design parameters for a proposed treatment plant. The column tests were adequately correlated by the Bohart‐Adams equation.

Phosphate removal from water using an iron oxide impregnated strong base anion exchange resin

“…The breakthrough curves became less sharp when the mass transfer rates were decreased [29]. Since mass transfer rates were finite, the breakthroughs were diffused and exhibited an S-shape pattern.…”

Appropriate technology for domestic wastewater management in under-resourced regions of the world

“…Because of the very polar character of this material, the specific adsorption for dissolved solids such as transition metals and polar organic molecules is reported to be quite high (Coupal and Lalancette 1976). It has been reported that peat is very effective in the removal of textile dyes (Poots et al 1975;Stephen et al 1988); Pesticides (Brown et al 1979, Williams andCrawford 1983;Cloutier et al 1984); heavy metals (Coupal and Lalancette 1976;Smith et al 1977;Chancy and Hundemann 1979); oily compounds (Mathavan and Vivaraghavan 1989); and radioactive materials (Belanger et al 1987).…”

Adsorption studies on the removal of hexavalent chromium from aqueous solution using a low cost fertilizer industry waste material

“…The breakpoint on the curve has been adopted by various workers differently to determine the breakthrough capacity of the column [38,39]. The calculation [29] of breakthrough capacity, exhaustion capacity and degree of column utilization have been evaluated from breakthrough curve as given in fig.…”