Ammonia removal from leachate by photochemical process using H2O2

Núbia Natália Brito,José Euclides Stipp Paterniani,Giovani Archanjo Brota,Ronaldo Teixeira Pelegrini

doi:10.4136/ambi-agua.136

Abstract

In this work, it was studied the optimization of the photochemical process using H2O2/UV in order to reduce the concentration of ammonia in leachate. It was used landfills leachate previously treated in the development of studies. A photochemical reactor with the capacity of 1.7 liters equipped with refrigeration system and recirculation of leachate was employed in the research. The influence of temperature, the light bulb power, the concentration of H2O2 and treatment time were tested during the study. A removal of 97% of ammonia was observed at 90 min.

Highlights

The leachate is generated in landfills, resulting from the water passage through the solid waste originating from household and industrial waste in the process of decomposition (Lin and Chang, 2000)
The oxygen supply to the photochemical process was held by bubbling air through a sintered glass at the bottom of the reactor using a compressor with a flow control valve (Sniff Compact) (Figure 1)
To initiate the studies of degradation of ammonia in the leachate, a 23 factorial design (Barros Neto et al, 1995) was developed to optimize some parameters of the treatment (Table 2). It was added a volume of 50 mL H2O2 10% (2.93 g L-1) and it was maintained with an air flow of 15 L min-1

Summary

Introduction

The leachate is generated in landfills, resulting from the water passage through the solid waste originating from household and industrial waste in the process of decomposition (Lin and Chang, 2000). Leachate may contain high levels of organic compounds, heavy metals, ammonia, chlorine and many other soluble compounds (Cabeza et al, 2007). The physicochemical composition varies greatly depending on factors ranging from rainfall conditions, time of disposition, age of the landfill, environmental conditions and characteristics of the dump (Bertazzoli and Pelegrini, 2002; Jeong-Honn et al, 2001; Marnie et al, 2005). Among the classes of pollutants found in leachate, ammonia has caused particular concern due to its high toxicity. Considerable concentrations of nitrogen, in ammoniacal form, can become toxic to organisms especially when present in aquatic environments.

Methods

Results

Conclusion