Nitration denitrificatoin and filter method and nitration denitrification and filter device for double-sludge series-connection aeration biofilter
A biological aeration filter, nitrification and denitrification technology, applied in the field of biological sewage treatment, can solve the problems of heterotrophic bacteria population structure susceptible to backwashing, no phosphorus removal effect, and reduced suspended solid concentration, etc., and achieve oxygen mass transfer. High efficiency and utilization rate, deep denitrification and suspended solids removal, and the effect of reducing hydraulic retention time
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[0047] Taking domestic sewage from a septic tank in a residential area as the treatment object, the hydraulic load of the device is 0.8m 3 / m 2 h, HRT=5h, the main water quality indicators of influent are: COD=210~355mg / L, NH 4 + -N=55~75mg / L, TN=60~85mg / L, pH=7~8, BOD / COD around 0.5, test temperature 18~20℃. System to COD, NH 4 + - The average removal rate of N and TN reaches 85%, 95% and 75% respectively, the dissolved oxygen in the effluent of the second biological aerated filter is 3-4mg / L, and the backwash cycle of the biological aerated filter under the test conditions is average up to 15d. However, the dissolved oxygen in the effluent of the traditional biological aerated filter process is 5-7mg / L, and the backwash cycle is generally 2 days, so as to achieve the purpose of saving energy, reducing consumption and increasing water production.
[0048] The TN of the domestic sewage received by the actual sewage treatment plant is in the range of 30-50mg / L. After bein...
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