期刊
BIORESOURCE TECHNOLOGY
卷 100, 期 13, 页码 3175-3179出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2009.01.036
关键词
Denitrification; Organic carbon source; Hydroponic wastewater; Nutrient removal; Nitrate removal
资金
- Horticultural New Zealand
A laboratory-scale hybrid-denitrification filter (HDF) was designed by combining a plant material digester and a denitrification filter into a single unit for the removal of nitrate and phosphorus from glasshouse hydroponic wastewater. The carbon to nitrate (C:N) ratio for efficient operation of the HDF was calculated to be 1.93:1 and the wCOD/BOD5 ratio was 1.2:1. When the HDF was continuously operated with the plant material replaced every 2 days and 100% internal recirculation of the effluent, a high level of nitrate removal (320-5 mg N/L, >95% removal) combined with a low effluent sBOD(5) concentration (<5 mg/L) was consistently achieved. Moreover, phosphate concentrations in the effluent were maintained below 7.5 mg P/L (>81% reduction). This study demonstrates the potential to combine a digester and a denitrification filter in a single unit to efficiently remove nitrate and phosphate from hydroponic wastewater in a single unit. (C) 2009 Elsevier Ltd. All rights reserved.
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