Device and method for quickly starting and maintaining shortcut nitrification of municipal sewage based on p-chloro-m-xylenol
A technology of chloro-m-xylenol and xylenol, which is applied in the field of biological denitrification treatment of urban sewage with low carbon-to-nitrogen ratio, can solve the problems of hidden safety hazards, unstable properties, and high economic costs of sewage treatment plants, and achieve long-lasting Stable short-range nitrification at room temperature, convenient operation and control, and strong feasibility
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Embodiment 1
[0027] The normal-temperature short-range nitrification device for urban sewage adopted in the method is an SBR reactor made of plexiglass, with an effective volume of 9L and a drainage ratio of the reactor of 50%. An aeration device is installed at the bottom of the reactor, the air is compressed by the aeration pump, and the air is released by the microporous aeration head; the p-chloro-m-xylenol sludge treatment device is also an SBR reactor, made of plexiglass, with an effective volume of 5L Both of them are fed by peristaltic pumps, water is discharged by electric drain valves, and sludge is returned by return peristaltic pumps, which are automatically controlled by time-controlled timers.
[0028] The activated sludge inoculated in the reactor comes from the excess sludge in the secondary sedimentation tank of a municipal sewage treatment plant in Beijing. The retrieved excess sludge is inoculated into the reactor after being washed several times. After inoculation, the s...
Embodiment 2
[0036] The difference between this embodiment and Example 1 is: use p-chloro-m-xylenol to quickly start the short-cut nitrification process and strengthen the short-cut nitrification process through side-flow inhibitor sludge treatment, then stop the side-flow inhibitor treatment directly instead of gradually reducing processing frequency. Other steps and parameters are the same as Example 1.
[0037] The changes of three nitrogen parameters during short-cut nitrification start-up and stable operation are as follows: figure 2 shown. This embodiment is divided into three stages, stage I startup stage (once a day), stage II stable operation stage (once a day), stage III stop side stream treatment stage. Phase I start-up phase and phase II stable operation phase are similar to the situation in Example 1. First, p-chloro-m-xylenol is used to suppress the activity of activated sludge nitrifying bacteria. After about 15 days, the activity of AOB basically returns to normal levels...
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