The invention discloses a method for treating rubbish percolates of different times for deep
denitrification by using a bipolar USAB+A / O+SBR process, which belongs to the technical field of biological
denitrification and is suitable for performing advanced treatment on the rubbish percolates. In the method, water output by an A / O reactor passes through a secondary
sedimentation tank, then part of the water flows back into a first-stage UASB reactor to perform
denitrification, so the method fully uses sufficient carbon sources of
raw water, realizes an efficient denitrification efficiency, and fully uses the characteristic that the rubbish percolates contain high-concentration organic substances. Dissolved
oxygen (DO), an oxidation-
reduction potential (ORP) and a pH value sensor are used for monitoring the degradation and the short-range
nitrification / denitrification processes of the organic substances in the reactor, and the short-range
nitrification / denitrification processes can be well controlled according to monitored pH values and ORP values. The average
ammonia nitrogen concentration of final yielding water is 2 mg / L, the
total nitrogen concentration is lower than 40 mg / L, and the
ammonia nitrogen removal rate and the
total nitrogen removal rate are above 98 percent. The method completely depends on biological treatments, reduces the cost and simplifies the process. The method performs denitrification on the rubbish percolates, not only realizes complete
nitrification but also realizes short-range nitrification, and realizes the deep removal of the
nitrogen in the rubbish percolates.