The time required to stabilise mature aerobic granules is rather variable. In addition, cultivation time andthe structural characteristics of granules seem to be related to the nature of wastewater influent.Granular sludge has been used for the treatment of several industrial wastewaters, but nothing has beenreported about wastewater characterized by the simultaneous presence of hydrocarbons and highchloride concentration. In this work, the authors analysed the granulation process and performance aswell as the physical characteristics of aerobic granules in two Granular Sequencing Batch Airlift Reactors(GSBARs), fed with acetate-based synthetic wastewater in reactor 1 (R1) and with a mixture of real andsimulated slop (R2). The results obtained in 100 days show that full granulation was achieved in bothreactors. The granules in R2 developed more quickly, but they appeared slightly unstable and moresusceptible to breaking. Despite high salt concentration, the efficiency of phosphorous and carbonremoval was satisfactory. Low nitrification activity was observed in R1, confirming that a longer time isnecessary to obtain the acclimation of autotrophic biomass in aerobic granules. In R2 the combined effectof salinity and hydrocarbons caused the inhibition of the autotrophic biomass, with the consequence thatnitrification was absent. Hydrocarbons were initially removed by adsorption afterwards by biologicaldegradation with a removal efficiency of over 90%.
|Numero di pagine||11|
|Rivista||INTERNATIONAL BIODETERIORATION & BIODEGRADATION|
|Stato di pubblicazione||Published - 2015|
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