A culture method of aerobic granular
sludge for simultaneous
denitrification and dephosphorization of domestic
sewage at low and normal temperature belongs to the
sewage treatment field and is characterized in that: an SBR reactor adopts 2-10 ratio of height to
diameter and 50-67 percent of volume exchange rate without regulation and control over
water temperature. The
precipitation time is 30-50min, and is reduced gradually to 1-3min; or the
precipitation time is set as 5-8min, and is reduced gradually to 1-3min. In biochemical reaction process, dissolved
oxygen concentration DO, oxidation-
reduction potential ORP and pH value are taken as real-
time control parameters to control stirring time in real time (
denitrification,
phosphorus release),
aeration time (
organic matter oxidation,
nitration,
denitrification, aerobic
phosphorus absorption, denitrifying
phosphorus absorption). The method can improve the content of nitrobacteria and
phosphate accumulating organisms, realizes the simultaneous denitrification and dephosphorization of low-COD domestic
sewage at low and normal temperature through the aerobic granular
sludge in anaerobic / aerobic manner, is simple in process, low in
sludge yield, high in reaction efficiency, good in sludge
precipitation performance and small in the area occupied by the reactor, and solves the problems of low operation efficiency and unstable treatment of
nitrogen and phosphorus caused by time programmed control of a
sewage treatment system.