Sewage treatment system and method for nitrogen removal and phosphorus recovery
A sewage treatment system and sewage technology, applied in the direction of flotation water/sewage treatment, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc., can solve the problem of high TP content in the effluent of the secondary sedimentation tank, waste of phosphorus, Increase the burden of biological phosphorus removal and other problems, achieve the effect of population advantage and activity enhancement, reasonable design, excellent ammonia nitrogen and total nitrogen effluent effect
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[0031] Example 1
[0032] like figure 1 , This embodiment provides a sewage treatment system for denitrification and phosphorus recovery, including a pretreatment system 1, a biological treatment system 2, an advanced treatment system 3, a sludge treatment system 4 and a phosphorus recovery system 5 connected in sequence. The system 1 includes a coarse grid 11, a fine grid, an aerated grit chamber 12 and a fine grid tank 13 connected in sequence, and the biological treatment system 2 includes an AO treatment unit 21 and a secondary sedimentation tank unit 22 connected in sequence, so The advanced treatment system 3 includes a denitrification filter tank 31, an air flotation tank 32 and a contact disinfection tank 33 connected in sequence; the sludge treatment system 4 includes a sludge concentration tank unit 41, a sludge conditioning tank 42 and a sludge concentration tank connected in sequence. Dehydration machine room 43; the phosphorus recovery system 5 includes a phospho...
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[0043] Example 2
[0044] like figure 1 , the present embodiment provides a sewage treatment method for denitrification and phosphorus recovery, wherein the method includes the following steps:
[0045] S1. Sewage enters the coarse grid 11, the fine grid, the aeration grit chamber 12 and the fine grid tank 13 in turn, to remove the garbage, fine suspended solids and sludge sand particles in the sewage;
[0046] S2. The sewage treated by the fine grid tank 13 is transferred to the water inlet channel of the AO treatment unit 21 through the biological pool water inlet main pipe 23, and the sewage is distributed proportionally to the anoxic tanks at all levels through the water inlet branch pipe 24. The removal of ammonia nitrogen, total nitrogen and organic matter is carried out in the AO treatment unit. Each AO unit is provided with a nitrifying liquid internal reflux system to strengthen the removal of total nitrogen; The mud and water are separated to remove SS, and the sew...
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