Treatment of Dairy Wastewater by Oxygen Injection: Occurrence and Removal Efficiency of a Benzotriazole Based Anticorrosive

Abstract

Abstract:Benzotriazole is used as corrosion inhibitor in many industrial sectors, such as the dairy industry. Due to its widespread use in various applications and everyday consumer products, this chemical easily reaches the aquatic environment, where it may have deleterious effects. In fact, benzotriazole has been included among the so-called emerging contaminants. In this work, the occurrence and fate of a benzotriazole based anticorrosive (BTA-A) during wastewater treatment in a dairy industry has been assessed. At this dairy, a new system for wastewater treatment based on the injection of pure oxygen was recently started. This system has been proved to be efficient, economic and able to stably operate under a wide range of chemical oxygen demand and total suspended solids inputs. Then, after detecting the presence of BTA-A in the effluent of the wastewater treatment plant, it was aimed to optimize oxygen injection for the removal of this anticorrosive together with the regulated parameters. The performance of the system was evaluated at a real scale during a month period, during which the mean removal performance of the oxygen injection based treatment was 91%, 90% and 99% for chemical oxygen demand, total suspended solids and BTA-A, respectively.

Impact of Different Groups on Properties of All Members of the Series of 1-X-Benzotriazole Derivatives (X= H, OH, NH2, Cl and CH3)

“…These types of studies are very important for the design of new and improved 407 drugs, taking into account that the uses and applications of these derivatives are very different between them. Thus, 1-Aminobenzotriazole (ABT) has been used from long time as an inhibitor of cytochrome P450 enzymes (Mugford et al, 1992;Emoto et al, 2003;Sun et al, 2011;Parrish et al, 2015;Watanabe et al, 2016;Shaik et al, Ortiz de Montellano, 2018) while 1-Hidroxybenzotriazole (HOBT) has multiple uses because it has explosive properties, is a reactive broadly used in organic chemistry as oxidant agent and, in addition, it can inhibit the copper corrosion, as was also reported for 1-Methylbenzotriazole (MBT) (Wehrstedt et al, 2005;Vemula et al, 2005;Hirai et al, 2006;Malow et al, 2007;Kokalj et al, 2010;Chen et al, 2014;Asimakopoulos et al, 2013;Santiago et al, 2018;Shi et al, 2019;Pacheco-Juárez et al, 2019;Kotowska et al, 2021). Besides, these derivatives widely used in many applications undergoes transformations with the exposure to UV light and represent the fourth most abundant aquatic contaminants and, for these reasons, they are also very important from environmental point of view (Asimakopoulos et al, 2013;Santiago et al, 2018;Shi et al, 2019;Pacheco-Juárez et al, 2019;Kotowska et al, 2021).…”