Journal
AGRICULTURAL WATER MANAGEMENT
Volume 229, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.agwat.2019.105937
Keywords
Nitrate removal; Denitrifying bioreactor; Agricultural drainage; Activated carbon; Flaxseed cake
Categories
Funding
- Lithuanian Ministry of Agriculture Research and Development Programme [V-02-22/16]
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The performance of three (1.0 m(3) 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 0, nitrate, nitrite, ammonium, sulfate, and chemical 0 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 degrees C and + 10.0 degrees 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.
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