Comparison of different treatment alternatives for removal of pesticide from water solution

Abstract

BACKGROUND: Removal of recalcitrant chemicals is an essential step in conventional wastewater treatment plants. Among these, pesticides are of great environmental concern. Different treatment options were compared in this work: the combination of advanced oxidation processes (AOPs) with biological treatment, an aerobic process and anaerobic biological treatments. The role of chemical processes in improving solution biodegradability was verified. Oxidation by-products were identified and biological process kinetics are reported. The performance of biological processes and their kinetics were studied.

Biodegradability enhancement of wastewater containing cefalexin by means of the electro-Fenton oxidation process

“…The above results suggest that even though the biodegradability increases as a function of treatment time, the time required to completely mineralize CLX (more than 24 h) make it unfeasible. However, the EF does enhance the biodegradability sufficiently for use in combination with a biological treatment process [47,48].…”

Kinetics of biodegradation of diethylketone by Arthrobacter viscosus

“…The possibility of wastewater to undergo biodegradation is dependent on many factors, such as concentration of contaminants and their chemical structure, water matrix, pH, and substrate/ co-substrate ratio (Al-Momani et al 2010).…”

Assessment of a fast method to predict the biochemical methane potential based on biodegradable COD obtained by fractionation respirometric tests

“…This negative effect may be due to the presence of toxic compounds in the wastewater, probably sodium hypochlorite (NaClO) or caustic soda (NaOH) (according to Na + concentrations, Table 3), washing agents typically used in dairy industry cleaning in place (CIP) systems (Hung et al, 2010). In general, aerobic microorganisms are less resistant to toxic and inhibitory compounds, which can derive on a lower aerobic biodegradability of the substrates as occurred with S1 (Al Momani et al, 2010;Amaral et al, 2015). Therefore, the use of a sludge acclimated to certain compounds that could hinder the performance of the respirometric tests, might avoid inhibition and allow for higher accuracy of the methodology.…”