Process for treating exhaust gases containing nitrides
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United States of America Patent
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-
Oct 22, 2002
Grant Date -
N/A
app pub date -
Sep 5, 2000
filing date -
Sep 6, 1999
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An exhaust gas containing nitrides is treated by a process comprising: passing the exhaust gas containing nitrides through a microbe carrier packed layer while cyclically spraying circulating water onto the packed layer, thereby forming a water containing ammonia and conducting biological reactions in which ammonia is converted to nitrate; converting the nitrate in the water to nitrogen by a denitrification reaction; and recirculating the water which has been denitrified in the process, wherein nitration of ammonia is conducted by spraying the circulating water having a pH regulated to not more than 7.5 onto the microbe carrier packed layer.
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