期刊
INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH
卷 11, 期 9, 页码 9835-9853出版社
MDPI AG
DOI: 10.3390/ijerph110909835
关键词
denitrification; iron; phosphate removal; sewage treatment plant effluent; wood
We investigated the removal of nitrogen and phosphate from the effluent of a sewage treatment plant over a long-term operation in bioreactors packed with different combinations of wood and iron, with a trickling filter packed with foam ceramics for nitrification. The average nitrification rate in the trickling filter was 0.17 kg N/m(3) day and remained at 0.11 kg N/m(3) day even when the water temperature was below 15 degrees C. The denitrification and phosphate removal rates in the bioreactor packed with aspen wood and iron were higher than those in the bioreactor packed with cedar chips and iron. The bioreactor packed with aspen wood and iron continued to remove nitrate and phosphate for >1200 days of operation. The nitrate removal activity of a biofilm attached to the aspen wood from the bioreactor after 784 days of operation was 0.42 g NO3-N/kg dry weight wood day. There was no increase in the amount of dissolved organic matter in the outflow from the bioreactors.
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