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Groundwater nitrate remediation using plant-chip bioreactors under phosphorus-limited environment

Author:
Satake, Shunichi, Tang, Changyuan
Source:
Journal of contaminant hydrology 2018 v.209 pp. 42-50
ISSN:
0169-7722
Subject:
Cryptomeria japonica, Lithocarpus, Phyllostachys edulis, bioreactors, denitrification, denitrifying microorganisms, detergents, dissolved organic carbon, equations, groundwater, nitrates, phosphorus, remediation
Abstract:
Groundwater denitrification bioreactors under limited phosphorus conditions were studied in column experiments using four types of plant-chips. When the phosphate-P concentration in the influent increased from 0.04mg/L to 0.4mg/L, the nitrate removal ratio increased from 61.6% to 86.1% in reed, from 7.2% to 12.6% in Japanese cedar, from 37.0% to 73.6% in Moso bamboo, and from 19.2% to 50.5% in Lithocarpus edulis. The carbon source of the denitrifiers' growth was indicated by the content of acid detergent soluble organic matter in the chips. Furthermore, according to the modified Michaelis–Menten-type equation proposed in the study, the denitrification rate was largely limited by the phosphate-P concentration in reed and L. eduilis, and by the dissolved organic carbon (DOC) in Japanese cedar. Denitrification in Moso bamboo was affected by both phosphate-P and DOC. Besides the DOC, phosphorus emerged as an important limiting element of denitrification in some bioreactor plant-chips.
Agid:
6283978