In this research, the efficiency of catalytic activity iron and manganese-loaded (bimetallic) sodium zeolite was investigated for ozonation-based removal disperse yellow 42 dye. The impregnation method used to deposit Fe Mn on surface zeolite. morphological analysis before after deposition conducted by SEM, EDX, FTIR. It found that several variables, including ozone dose, contact time, pH, cata...

Advanced oxidation processes like ozonation (O3) and ultrasonic irradiation (US) can be employed for the removal of recalcitrant compounds from water matrices. Atrazine is a pesticide which has been banned in the EU countries, since it is toxic and potentially carcinogenic even in very small concentrations. After their use in agricultural areas, the pesticides tend to leave residuals on the soi...

Introduction: Ammonia in form of ammonium ions is toxic and could decrease the dissolved oxygen in water and endanger the aquatic life. The aim of this study is the removal of ammonium using oxidation and adsorption by catalytic ozonation and clinoptilolite zeolite, respectively. Methods: The research method is Experimental. First, optimal pH of ammonium adsorption on carbon catalyst (5 g/L), ...

We apply an off-line process-based vegetation model (the Yale Interactive Terrestrial Biosphere model) to assess the impacts of ozone (O3) vegetation damage on gross primary productivity (GPP) in the United States during the past decade (1998–2007). The model’s GPP simulation is evaluated at 40 sites of the North American Carbon Program (NACP) synthesis. The ecosystem-scale model version reprod...

Zeolite activation is the first, but often overlooked, post-synthetic treatment needed to transform an as-made material into adsorbent or catalyst. Ozonation at low temperatures provides alternative for conventional calcination treatments, with important consequences zeolite stability and acidity. While sometimes used in context of emptying novel less thermally stable structures, a thorough loo...

The long-term effects of different influent Cr(VI) concentrations (0–0.5 mg L−1) on the nitrification activities and microbial community structures of nitrifying activated sludge system were investigated in this study. Results showed that the performance of ammonia oxidation was significantly inhibited, and the effluent concentration of ammonia nitrogen (NH4-N) increased markedly when the influ...

The microbial decolourization of Reactive Red 2 (RR2) dye has been studied under anaerobic conditions. Three semicontinuous bioreactors were operated with dye concentrations—R1 (control: 0 mg RR2 l−1), R2 (100 mg RR2 l−1) and R3 (200 mg RR2 l−1). The parameters monitored were, oxidation–reduction potential (ORP), methane production, colour and chemical oxygen demand (COD) removal during the fee...

We continue our discussion of Verifiable Secret Sharing, giving two instantiations of the general schema from the last lecture. First, using Commit(x) = g: Feldman VSS, which leaks nothing but g and is perfect binding. Second, using Perdersen’s commitment Commit(x; r) = gh: Pedersen VSS. Next, we turn to the problem of adaptive security. We describe an adaptively secure Feldman VSS using trapdo...

Abstract Phenol has been introduced as a priority pollutant by the US Environmental Protection Agency. Advanced oxidation processes (AOPs) are one of most efficient methods for removal non-degradable organic pollutants in aqueous solutions. The efficiencies phenol and COD under optimal conditions pH = 3, concentration 5 mg/L, CaO 2 0.025 temperature 25 °C, 1 g/min ozonation rate contact time 90...