SCIENCE@home

Nitrate removal from tile drainage water: The performance of denitrifying woodchip bioreactors amended with activated carbon and flaxseed cake

A. Povilaitis,Jolanta Matikienė

Published 2020 in Agricultural Water Management

ABSTRACT

Abstract The performance of three (1.0 m3 volume each) pilot-scale bioreactors, with one filled with woodchips only and the other two amended (10% v/v) with activated C and flaxseed cake, respectively, was tested under field conditions for nitrate removal from tile drainage water in Lithuania. The bioreactors were monitored for a period of 1.5 y, during which the flow rate, hydraulic retention time, water T, pH, dissolved O, nitrate, nitrite, ammonium, sulfate, and chemical O demand concentrations were measured. The results showed that the average nitrate removal efficiency in the bioreactor with no additives was 40.3%, and it was 44.1% in the bioreactor with activated C additives. In the bioreactor with flaxseed cake additives, 41.2% of the N was removed. During the cold seasonal period when the inflow T varied between +1.8 °C and +10.0 °C, activated C-amended woodchips showed higher efficiency and supported higher nitrate removal rates compared to those of other fillers. The highest nitrate removal efficiency was achieved at a pH of 7.0–7.5. The experiment demonstrated the potential for the enhancement of nitrate removal through the incorporation of activated C in denitrifying bioreactors. The addition of activated C substantially reduced the organic C losses while maintaining denitrification. Woodchips amended with flaxseed cake showed no significant difference in nitrates removal compared to the woodchips only treatment. A much higher release of organic C with no added effect on nitrate removal indicated that flaxseed cake as an external C source was more biodegradable than woodchips, but the benefit of its addition to woodchips was not proved.

PUBLICATION RECORD

CITATION MAP

EXTRACTION MAP

CLAIMS

  • No claims are published for this paper.

CONCEPTS

  • No concepts are published for this paper.

REFERENCES

Showing 1-73 of 73 references · Page 1 of 1

CITED BY

Showing 1-12 of 12 citing papers · Page 1 of 1