The invention relates to a method for culturing shortcut
nitrification granular
sludge by combining the
dual inhibition of free
ammonia (FA) and free
nitrous acid (FNA), and belongs to the technical field of the biological
denitrification of
wastewater. The method comprises the following steps of: inoculating flocculent active
sludge to a
sequencing batch reactor (SBR), and pumping
wastewater which contains
chemical oxygen demand (COD) and
ammonia nitrogen and serves as inflow from the bottom of the reactor; after a liquid level is reached, starting a stirrer and a blast blower to perform aerobic
nitration, degrading organic matters and oxidizing the
ammonia nitrogen to form nitrites; after the
nitration is finished, stopping aerating and stirring, precipitating to obtain supernatant containing the nitrites, and discharging
sewage from a drainage valve, wherein in the culture conditions, the temperature of the reactor is between 25 and 30 DEG C, NaHCO3 solution is added after
aeration is performed for 30 minutes, so that the pH value is kept between 7.5 and 8.0, dissolved
oxygen is between 3 and 5 mg / L, upflow is provided at the speed of between 1.0 and 1.5 cm / s, and
sludge age is between 12 and 15 days; and culturing for 30 to 50 days to obtain the shortcut
nitrification granular sludge. By the method, the removal efficiency of a
denitrification system can be improved effectively,
oxygen supply and
denitrification carbon sources can be saved, the yield of the sludge can be reduced, the volume of the reactor can be reduced, and the construction and
operating cost can be saved.