Abstract
Low cost adsorbents such as P. australis have received considerable interest owing to their low cost and easy availability. The aim of the present study was the evaluation of the removal of chemical oxygen demand (COD), biological oxygen demand (BOD), total suspended and dissolved solids (TSS and TDS) using dried P. australis in influent wastewater to a wastewater treatment plant. The results of the COD and BOD concentration reduction with P. australis at optimum operating conditions were determined for maximum reduction and adsorption isotherms. The maximum reduction of COD, BOD, TSS and TDS concentrations under the optimum operating conditions was 92.27%, 93.89%, 94.38% and 91.61%, respectively. The results demonstrate that the new dried biosorbent is able to adsorb all the aforementioned contamination. It achieved an adsorption capacity for COD of 72.5 mg g−1 and an adsorption capacity for BOD of 43.93 mg g−1. The results were well fitted by the pseudo-second order model with R2 = 0.984.
Highlights
Owing to the fast depletion of freshwater resources, the world is facing a fresh water crisis
The present study concluded that Fourier transform infrared spectroscopy (FTIR) results reveal that a large amount of chemical functional groups were preserved and generated on the surface of P. australis, which might enhance its adsorptive properties owing to the functional groups –OH, CH2, C–O and C]C
This study demonstrated that P. australis can reduce the organic load (COD, biological oxygen demand (BOD), total suspended solids (TSS) and total dissolved solids (TDS)) in domestic wastewater and achieved higher removal ratios compared to other agrowastes
Summary
Owing to the fast depletion of freshwater resources, the world is facing a fresh water crisis. Industrial and domestic activities have polluted the surface water as well as ground water to a greater extent.[1] It is important that a supply of good quality water should be available for various activities This is becoming gradually more difficult in view of the major pollution caused by industrial, agricultural and domestic activities. These activities produce wastewater with both inorganic and organic pollutants, which result in water pollution.[2] In rural, urbanized villages and small towns in most developing and poor countries, sewage is discharged in open drain branches. Chemical oxygen demand (COD), biochemical oxygen demand (BOD) and total organic carbon are measured
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