Abstract
The water treatment sludge due to its high content of metal hydroxide, largely and easily available nature coupled with the fact that it is free of charge can be considered as a valuable raw material for treatment of various pollutants in wastewater. In this research, the potential and effectiveness of the water treatment sludge was studied as an alternative adsorbents for the removal of ammonia nitrogen in aqueous solution. The water treatment sludge was activated by KOH. Then, the adsorption isotherms and adsorption kinetics of the model compound over the modified water treatment sludge were determined and discussed in detail. The results showed that the equilibrium data fitted with the Langmuir isotherm. The adsorption data fitted the pseudo-second-order model.
Highlights
In recent years, with the expansion of industrial scale and intensification of human activities, emissions of domestic sewage and industrial wastewater containing ammonia nitrogen have been increased rapidly (Zhang et al, 2013)
The potential and effectiveness of the water treatment sludge was studied as an alternative adsorbents for the removal of ammonia nitrogen in aqueous solution
The water treatment sludge was activated by KOH
Summary
With the expansion of industrial scale and intensification of human activities, emissions of domestic sewage and industrial wastewater containing ammonia nitrogen have been increased rapidly (Zhang et al, 2013). The wastewater containing ammonia nitrogen may cause eutrophication and produce toxic substances if they were discharged into the aquatic ecosystem (Camargo and Alonso, 2006). It is imperative to remove ammonia nitrogen in aqueous solution. The research on the removal of ammonia nitrogen in aqueous solution has been carried out extensively in recent years. The adsorption technology is a more effective way to remove nitrogen, due to its advantages, namely small floor area, simple process and high efficiency, among others. It is required to develop new material for effective removal of ammonia nitrogen with low cost
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