Deep bed underflow process for enhanced nitrogen removal advanced treatment of low-pollution sewage
A technology with advanced treatment and low pollution, which is applied in the field of deep bed undercurrent to ensure stable operation.
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[0049] Specific examples are given below
[0050] The flow rate of the treated sewage treatment plant tail water is 20000m 3 / d, the average water depth of the aerobic stabilization pond 4 is 0.8m, and the hydraulic retention time is 0.6d.
[0051] The aeration drop weir 7 between the primary surface flow wetland and the secondary surface flow wetland is separated. The aeration drop weir 7 has a design drop height of 60cm and a design depth of 20cm. The total area of the surface flow wetland is 12000m 2 . The ratio of the length of the primary surface flow wetland to the length of the secondary surface flow wetland is 1:2. The aspect ratio of each level of surface flow wetland is 3:1.
[0052] The design average water depth of the first-level surface wetland is 0.6m, and the nitrifying bacteria inoculum is added to the first-level surface stream wetland. The influx index of the inoculum in the constructed wetland system is the first-level A standard of the urban sewage treatment ...
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