Optimization of ammonia removal by ion-exchange resin using response surface methodology

Abstract

The ability of ion-exchange resin for ammonia removal from aqueous solution was studied. The results showed that Amberlite ion-exchange resin was effective in removing ammonia from aqueous solution. Factorial design and response surface methodology were applied to evaluate and optimize the effects of pH, resin dose, contact time, temperature and initial ammonia concentration. Low pH condition was preferred with the optimum pH found to be 6. High resin dose generated high removal rate and low exchange capacity. Results of factorial design and response surface methodology showed that temperature was not a significant parameter. The model prediction was in good agreement with observed data (R 2 = 0.957). The optimum Q e was 28.78 mg/ g achieved at pH = 6 and initial TAN concentration of 3000 mg/L. The kinetics followed the pseudo-second-order kinetic model (R 2 = 0.999). Equilibrium data were fitted to Langmuir and Freundlich isotherm models with Langmuir model providing a slightly better predication (R 2 = 0.996). The resin was completely regenerated by 2 N H 2 SO 4 .

Remediation of Simulated Landfill’s Leachate Using Waterworks Sludge and Other Conventional Materials

“…It is clear that the removal percentage is increased with increasing of contact time in the first 5 min and, then, equilibrium was reached. After that, there was no significant increase in removal value and this result was in good agreement with previous studies such as [10].…”

“…In addition, the calculated values of sorbed quantity for sorption of contaminants onto the sorbents are in a good agreement with the experimental values. Also, Fig.16 (b) shows that the uptake of NH3-N by ion-exchange resin increased with an increasing of contact time in the first 20 min and, then, the equilibrium was reached where this result is consistent with results reported by [10].…”

“…The resin was washed with distilled water to remove dirt and any chemical impurities and, then, it was dried at 105oC for 12 hr. It was pretreated with strong acid 0.1 N HCl to completely convert cation exchanger to their H+ form [10]. After that, resin was washed with distilled water to remove all the acid and dried at room temperature .…”

Removal of ammonia from a smelting wastewater by cyclic stripping and acid adsorption: Kinetics study

“…Large volumes of high‐concentration ammonia containing wastewater is produced from chemical industry, smelting, landfill leach, and agriculture. The traditional methods for ammonia removal generally involve biological treatment, air stripping, struvite precipitation, adsorption, ion‐exchange, and electrolysis .…”

Factorial Economic Planning Applied to Agricultural Experimentation

“…The Response Surface consists of a set of mathematical and statistical methods used in the study of the relation between factors and responses [1,2,3], that may be the result of a first-order polynomial or more complex interactions with polynomials of a higher order [4], this relation may be stated by equation (1): ŷ = f(x1,x2)+ϵ (1) where ŷ is the answer, because of the variables x1 and x2, added to the experimental error ϵ [5,6]. The designs of the Rotational Central Composite Design -RCCD and 3 k are second order designs, that is, the regression equation that describes the behavior of the variables also presents the quadratic terms and has the characteristic of repeatability in the central point, are flexible and require smaller numbers of experimental units [7,8] compared to the full factorial applied in the investigation the effect of many treatments.…”