Patent ID: 9670084
Date: 2017-06-06
CPC Classifications: C02F,Y02W

Claim:
1. A method for treating a wastewater containing tetramethylammonium hydroxide (TMAH) and ammonium nitrogen, the method comprising the steps of: (a) introducing a first solution, which contains ammonium nitrogen but does not contain TMAH, into a single reactor with microorganisms comprising nitrifying bacteria and anammox bacteria, and denitrifying the first solution by the microorganisms under a dissolved oxygen concentration ranging from 0.1 to 0.5 mg/L and a pH value ranging between 7 and 8; (b) when a denitrification efficiency of the reactor reaches a steady state, introducing a second solution, which contains ammonium nitrogen and TMAH and has a concentration of TMAH lower than 60 mg/L, into the reactor; and (c) when the denitrification efficiency reaches a steady state again, introducing a third solution, which contains the ammonium nitrogen and TMAH and has a concentration of TMAH higher than that of the solution previously introduced, into the reactor; repeating this step, even when TMAH remains in an outflow of the reactor, until an inflow having a concentration of TMAH of 1000 mg/L is introduced into the reactor.