02683nas a2200229   4500008004100000022001400041245010700055210006900162260000800231300001100239490000700250520191300257653001702170653001502187653001402202653001402216653002502230100002202255700002402277700002202301856013002323       2021                        eng d  a1350-417700aImproving efficiency for removal of ammoniacal nitrogen from wastewaters using hydrodynamic cavitation0 aImproving efficiency for removal of ammoniacal nitrogen from was  cJAN  a1053060 v703 a<p>The present study reports significant improvements in the removal of ammoniacal nitrogen from wastewater which is an important problem for many industries such as dyes and pigment, distilleries and fisheries. Pilot plant studies (capacity, 1 m(3)/h) on synthetic wastewater using 4-amino phenol as model nitrogen containing organic compound and two real industrial effluents of high ammoniacal nitrogen content were carried out using hydrodynamic cavitation. Two reactor geometries were evaluated for increased efficiency in removal-orifice and vortex diode. Effect of initial concentration (100-500 mg/L), effect of pressure drop (0.5-5 bar) and nature of cavitating device (linear and vortex flow for cavitation) were evaluated along with effect of salt content, effect of hydrogen peroxide addition and aeration. Initial concentration was found to have significant impact on the extent of removal: similar to 5 g/m(3) removal for initial concentration of 100 mg/L and up to 12 g/m(3) removal at high concentration of 500 mg/L. Interestingly, significant improvement of the order of magnitude (up to 8 times) in removal of ammoniacal nitrogen could be obtained by sparging air or oxygen in hydrodynamic cavitation and a very high removal of above 80% could be achieved. The removal of ammoniacal nitrogen by vortex diode was also found to be effective in the industrial wastewaters and results on two different effluent samples of distillery industry indicated up to 75% removal, though with longer time of treatment compared to that of synthetic wastewater. The developed methodology of hydrodynamic cavitation technology with aeration and vortex diode as a cavitating device was found to be highly effective for improving the efficiency of the conventional cavitation methods and hence can be highly useful in industrial wastewater treatment, specifically for the removal of ammoniacal nitrogen.</p>
10aAmino phenol10aCavitation10aOxidation10apollution10aWastewater treatment1 aPatil, Pravin, B.1 aBhandari, Vinay, M.1 aRanade, Vivek, V.  uhttps://library.ncl.res.in/content/improving-efficiency-removal-ammoniacal-nitrogen-wastewaters-using-hydrodynamic-cavitation