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In recent years, although China has increased efforts to investment in water pollution control , but water still serious environmental pollution . According to China 's specific national conditions , development of a low energy consumption, nitrogen removal was a good sewage treatment process is of great significance . Biological Aerated Filter Set biological oxidation and solid-liquid separation in one , eliminating the need for secondary settling tank , with investment, low energy consumption advantages. Biological Aerated Filter for the Harbin Institute of Technology Campus sewage test research, focusing on the effects of hydraulic loading , gas-water ratio , pH value and COD / NH 3 -N/TP exposure gas biofilter simultaneous nitrification and denitrification effect . The test results showed that: when the hydraulic loading 0.5m 3 / (m 2 · h), the gas-water ratio of 2:1 and the pH in the 7.0-8.0 range , the system achieved good effect of the simultaneous nitrification and denitrification . COD removal occurs mainly 0-60cm in height filter area , the region COD removal efficiency of 88.9% of the total removal rate , removal of ammonia nitrifying bacteria are mainly distributed in the filter height more than 40cm . COD / NH 3 -N NH 3 -N and TN removal efficiency significantly , as the COD / NH 3 -N elevated , NH 3 -N removal rate downward trend when the COD / NH 3 -N the TN removal best 8:00 , The removal efficiency of 54.9% . COD removal efficiency decreased as the COD / TP rise The system effluent COD concentration of less than 50 mg / L, when the COD / TP is less than 100/0.4 ; influent COD / TP in 100/1.0-100/0.6 range of within , NH 3 -N removal efficiency is relatively stable , the effluent NH 3 < / sub > -N concentration fluctuation stabilized at around 3.2mg / L , NH 3 -N removal rates of up to 90% when the COD / TP 100/0.4 , TP insufficient to limit microbial growth and metabolism , one of the key factors inhibit biological nitrification . In this paper, gas water combined biological aerated filter backwash , the processing performance of biological aerated filter backwash decreased in varying degrees , the ability of the carbonation heterotrophic bacteria and nitrification recovery from bacteria , but weak resilience of denitrifying bacteria in the test period . Biological Aerated Filter to remove organics kinetic model derived through the analysis of a large number of test data , the establishment of a biological aerated filter to remove organic matter dynamics equation .
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