Efficiency comparison of heterotrophic denitrification in bioreactors treating agricultural drainage water with different organic matter sources

Authors

DOI:

https://doi.org/10.5902/2179460X87053

Keywords:

Corn cobs, Corn stalk, Biological processes

Abstract

Nitrate, when transferred in large amounts to surface waters, can cause serious problems for the environment and the health of humans and animals. The use of bioreactors with biodegradable organic supports emerges as an alternative for the treatment of nitrate-contaminated water. This study aimed to improve nitrate removal efficiency using different agricultural residues associated with Mini Biobobs® (a polyurethane foam biofilm carrier) at different hydraulic retention times (HRTs) and temperatures. Five reactors filled with different combinations of supports were evaluated: CS (corn stalk), CC (corn cobs), Mi (Mini Biobobs®), CS+Mi (corn stalk + Mini Biobobs®), and CC+Mi (corn cobs + Mini Biobobs®). The study was divided into two phases: Phase I, without temperature control and with HRTs of 24, 16, and 8 hours; and Phase II, with two temperatures (18 and 30 °C) and a fixed HRT of 8 hours. In both phases, the influent consisted of agricultural drainage water enriched with 20 mg L-1 of NO3--N. In Phase I, all reactors, except Mi, produced effluents with a maximum NO3--N concentration of 10 mg L-1. In Phase II, the highest nitrate removal efficiency was achieved at 30 °C. The results indicate that corn residues are promising alternatives for removing nitrate from agricultural drainage water.

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Author Biographies

Elaine Macedo Stolle, Universidade Estadual de Ponta Grossa

Currently pursuing a PhD in Food Science and Technology at the Universidade Estadual de Ponta Grossa (UEPG). Holds a degree in Food Engineering and a master's degree in Food Science and Technology with an emphasis on Environmental Sanitation from UEPG.

Tatiane Martins de Assis, Universidade Estadual de Ponta Grossa

Doctor of Agricultural Engineering with a concentration in Environmental Sanitation from the Universidade Estadual do Oeste do Paraná (UNIOESTE). Post-Doctorate in Food Science and Technology from the Universidade Estadual de Ponta Grossa (UEPG).

Ana Claudia Barana, Universidade Estadual de Ponta Grossa

Post-doctoral researcher in Hydraulic and Sanitary Engineering at the Universidade São Paulo (USP) and Water Quality at Iowa State University (ISU,USA). PhD in Agronomy from the Universidade Estadual Paulista (UNESP).

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Published

2026-05-15

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