The ammonia nitrogen level in the water after advanced treatment is actually higher than that in the water after secondary treatment – what’s the problem?
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Our plant uses the AAO process for treating domestic wastewater, with a daily treatment capacity of 20,000 tons. This capacity is divided into Phase 1 (0.8 million tons per day) and Phase 2 (1.2 million tons per day). In the past two days, the ammonia nitrogen level in the effluent from the secondary sedimentation tanks in Phase 1 was 3.3 mg/L and 3.0 mg/L, respectively, while in Phase 2 it was 0.5 mg/L and 0.4 mg/L respectively. However, after passing through the advanced treatment stage, the ammonia nitrogen level rises to 4.6 mg/L and 4.7 mg/L. What is the cause of this problem? The advanced treatment process consists of an intermediate lift pump—high-speed flocculation sedimentation tank—activated sand filter—ultraviolet disinfection. . .
It is necessary to measure the total nitrogen to determine whether it has been converted into ammonia nitrogen during the advanced treatment stage.