Ammonia, Nitrite and Nitrate Nitrogens Removal fro Polluted Water with Ozonation and Bio-Activated Carbon Processes

摘要

Studies o nthe removal of ammonia-, nitrite- and nitrate nitrogens with ozonation, sand filtration, biological activated carbon, SF-BAC and/or O_3-PAC processes were carried out in two pilot plants and a full scale plant respectively. The results showed that all the tested processes exhibit certain nitrogen removal efficiencies, of hwich both the O_3-Sf-Bac and O_3-BAC processes were most effective and efficient in removing ammonia nitrogen with mean removal efficientcies of about 90 and 80 percent respectively. Ozonation as found able to oxidize some organic nitrogen into ammonia and nitrite into nitrate. It was also with interest found out that the O_3-PAC process can carry the nitrification process to the end uner sufficient DO content conditiosn in its carbo nbeds due to degradation of ozone, while in the BAC process the DO content was too low to sustain nitrate conversion bacteria like nitrificans bacillus to grow, but the nitrite conversion bacteria can survive under such circumstances. As a result, nitrite or nitrate content rised multiply in the effluents from BAC or O_3-RAC process respectively over their influents.