# Water Treatment Engineer # Recently, the sewage treatment, air flotation and A2O process in the food factory producing egg products appeared high ammonia nitrogen. What are the usual reasons and how to solve them? The high ammonia nitrogen indicates that it has not been transformed into nitrate bacteria and nitrite bacteria, so the aeration amount and aeration time are increased. The sludge added with flocculant does not form, indicating that the sludge is seriously aging, and the increase in excess sludge discharge comes from Q user: Teacher Yang.

Try using calcium chloride instead of lime. Ammonia nitrogen generally exists in domestic sewage. The high ammonia nitrogen may be due to the lower TP concentration in the reactor than usual. Phosphate fertilizer can be properly added to the reactor to increase the reflux ratio, so as to maintain the sludge concentration of the biochemical unit and improve the impact load resistance of the system. From Q user: Mr. Cai