Influence of Elevated Temperature and Pressure on Treatment of Landfill Leachate by Potassium Ferrate(VI)

Abstract

The significant problem is the treatment of landfill leachate characterized by high chemical oxygen demand (COD) and total organic carbon (TOC) and presence of biodegradation inhibitors such as heavy metals and oily substances. For the case of landfill leachate (pH 7.9, color 1550 mg Pt/L, COD 1880 mg O2/L, TOC 620 mg/L, total nitrogen (TN) 220 mg/L, total phosphorus (TP) 6 mg/L and heavy metals), the effect of elevated pressure and temperature on the decrease COD value by potassium ferrate(VI) (K2FeO4) was investigated. Taguchi method (TM) was employed for optimizing the treatment process parameters (repetition, pH, K2FeO4 concentration, time, temperature, and pressure). Maximizing the criterion function of signal-to-noise (S/N), the optimal parameters were determined: pH 3.5, K2FeO4 2.0 g/L, time 45 min, temperature 30 °C, and pressure of 1 MPa. At optimal conditions, a decrease of color, COD, TOC, and TP was above 91%. Additionally, the decrease of TN was 48.2%. Comparatively, at atmospheric pressure (0.1013 MPa) and at 19 °C, the decrease of color, COD, TOC, TP, and TN was 99.9%, 83.0%, 79.0%, 19.1%, and 100%, respectively. Addition of potassium ferrate(VI) may improve organic compound removal and decreases energy consumption in subcritical water oxidation. Graphical abstract

Oxidative Degradation of Hazardous Benzene Derivatives by Ferrate(VI): Effect of Initial pH, Molar Ratio and Temperature

“…Other researchers have also confirmed these phenomena that the ferrate concentration decreases with an increase in temperature above 50 • C [41]. In general, temperature is very influential in the aqueous decomposition rate of ferrate [42]. As shown in Figure 8, the highest k app values were observed at 45 • C. The Arrhenius equation (Equation ( 9)) is used to determine the activation energy, and the activation energy value was found to be 81.6 KJ/mol for bromobenzene degradation and 80.540 KJ/mol for chlorobenzene degradation.…”

Investigation of groundwater vulnerability to open dumpsites and its potential risk using electrical resistivity and water analysis

“…Therefore, the characteristics of the landfills located in such difficult terrain are mainly affected by the meteorological conditions of the terrain, and the environmental impact may be difficult to predict. The temperature of the waste layer in the dumpsites increases generally due to the high pressure created, which invariably catalysed the degradation of the newly filled MSW because heat is a major factor that spread gas and leachate plumes [ [43] , [44] , [45] , [46] ]. That is, a region may be controlled and influenced by the characteristics of a dynamic dumpsite leachate plume contaminants by the conditions of climatic.…”

Treatment of Tanning Effluent Using Seaweeds and Reduction of Environmental Contamination

“…Due to scarcity of water, the quantity of water used for washing is less in Tamil Nadu when compared with that of other parts of the country. Due to this, the concentrations of chemical oxygen demand (COD) and biochemical oxygen demand (BOD) are comparatively high in wastewater [8,9]. However, in the case of tanneries in Uttar Pradesh, Punjab, and West Bengal, the volume of water used for washing is high and this results in dilution of the pollutants [10,11].…”