| 摘要 |
<p>A process is described for treating wastewater, such as blast furnace blowdown wastewater, containing 100 to 600 ppm ammonia and having a chemical oxygen demand of 50 to 500 ppm and possible further contaminants, including cyanide, cyanate, thiocyanate, sulfide and/or organic materials. Substantially complete nitrification of the ammonia into nitrite or nitrate, is achieved by microbially treating the wastewater in a fixed film biological treatment system, such as a rotating biological contactor, which includes microorganisms capable of converting ammonia to nitrite and microorganisms capable of converting nitrite to nitrate. The system preferably also contains microorganisms for removing cyanide and many be periodically acclimatized to expected peaks in free cyanide concentration.</p> |
