The removal of diuron from agricultural wastewaters by Trametes versicolor immobilized on pinewood in simple channel reactors

Eduardo Beltrán-Flores, Josefina Torán, Glòria Caminal, Paqui Blánquez*, Montserrat Sarrà

*Corresponding author for this work

Research output: Contribution to journalArticleResearchpeer-review

Abstract

The presence of pesticides in agricultural wastewater entails harmful risks to both the environment and public health. In this study, two channel-type bioreactors with Trametes versicolor immobilized on pinewood chips were evaluated in terms of the removal efficiency of diuron from agricultural wastewater under non-sterile conditions. First, both single and successive sorption processes of diuron on pinewood chips were evaluated. The Freundlich model showed the best correlation in the sorption isotherm study (R2 = 0.993; Δq = 5.245), but according to repeated sorption experiments, the Langmuir model (R2 = 0.993; Δq = 5.757) was considered more representative. Equilibrium was reached after approximately 48 h, and the Elovich kinetic model gave the best fit with the experimental data. A packed-bed channel bioreactor (PBCB) was found to be a remarkable alternative able to remove up to 94% diuron from agricultural wastewater during 35 d. However, periodic manual mixing was required to guarantee an aerobic process, and a rotating drum bioreactor (RDB) was subsequently proposed as an enhanced version. The RDB removed up to 61% diuron during 16 d using almost 7 times lower wood dose (152 g wood·L−1) than in the PBCB (1000 g wood·L−1).

Original languageAmerican English
Article number138414
JournalScience of the Total Environment
Volume728
DOIs
Publication statusPublished - 1 Aug 2020

Keywords

  • Bioreactor
  • Fungal treatment
  • Low-cost sorbent
  • Organic contaminant
  • Pesticide

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