Relationship between activated sludge death and total phosphorus

This post was last edited by zdl1966 on 2016-1-10 at 13:54. Baidu says: Denitrification: Nitration must occur first, followed by denitrification. Phosphorus removal: anaerobic phosphorus release, aerobic phosphorus uptake. The influencing factors are: DO, carbon source. During the aerobic stage, DO can be maintained at 1-2 ppm; in the anoxic and anaerobic stages, DO should be below 0.5 ppm. Both denitrification and phosphorus release require a carbon source; if the carbon source is insufficient, it should be supplemented appropriately. Regarding denitrification and phosphorus removal, the operation mode is as follows: water is introduced during the anaerobic stage, during which phosphorus-oxidizing bacteria release phosphorus while organic matter undergoes fermentation. It is necessary to ensure full contact between the sludge and the influent water. During the aerobic stage, dissolved oxygen and reaction time are primarily controlled to remove COD, carry out nitrification, and eliminate phosphorus from the wastewater. To transition from aerobic to anaerobic conditions, an anoxic phase is required; the process that takes place then is denitrification, and it is essential to ensure thorough contact between the sludge and water. Sludge acclimatization stage: The sludge should first be acclimatized in the aerobic phase to ensure its good activity, before proceeding with subsequent adjustments. The operating parameters for aerobic, anoxic, and anaerobic conditions are determined by adjusting the biochemical reaction time and measuring the ammonia nitrogen, COD, and TP in the effluent. If a mixer is not installed in the SBR, the sludge and water cannot come into sufficient contact during the anoxic and anaerobic stages, resulting in poor removal efficiency. If the aeration time is short, nitrification is incomplete ； If the period of oxygen deficiency is short, denitrification is incomplete ； If the anaerobic treatment time is long, the TP removal rate in the effluent is low