On‐site denitrification in a tile field

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Abstract
A detailed study of on‐site denitrification indicated that nitrate could be removed from domestic wastewater by using kitchen waste as an external carbon source through biological denitrification in a conventional tile field. Denitrification took place in the entire soil profile of 1200 mm in a full‐scale tile bed in the laboratory and the presence of water table was not a significant factor affecting denitrification; high levels of nitrate were removed both from the saturated and the unsaturated zone. The percentage of nitrate removal increased from 21% to 81% with the increase in soil depths. The most important factors governing denitrification were the external source of organic carbon, dissolved oxygen concentration and the air‐filled porosity. The biological denitrification process could be described by the first order kinetics and the rate constant was estimated to be 0.422 hr‐1.

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