Double-layer filter material biological aerated filter
A technology of biological aerated filter and double-layer filter material, which is applied in the direction of sustainable biological treatment, biological water/sewage treatment, water/sludge/sewage treatment, etc., and can solve the problem of long backwashing time, uneconomical and High strength and other problems, to achieve the effect of reducing backwash resistance loss, reducing backwash water consumption, and improving nitrification efficiency
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Embodiment 1
[0014] Embodiment 1: the processing of lower concentration domestic sewage (COD concentration is 100-250mg / L): the filter material particle diameter of lower part is 4-6mm, and density is (1800-2200) kg / m , height is 1-1.5m; The upper filter material is 2-3mm, the density is (1800-2200)kg / m3, and the height is 2-3m. The operating water flow rate is 2-3m / h, and the water-air ratio is 1:3-1:6. This process adopts the method of alternating large and small backwashes for backwashing, and a large backwash is performed after about 5-7 small backwashes. Both large and small backwashing adopt air-water combined backwashing method. The removal rate of suspended solids is about 80%, the removal rate of COD is about 80%, and the removal rate of ammonia nitrogen is 80-95%.
Embodiment 2
[0015] Embodiment 2: the treatment of very low concentration domestic sewage (COD concentration<100mg / L): the filter material particle diameter of lower part is 3-5mm, and density is (1800-2200) kg / m3, and height is 1-1.5m; The filter material is 1-3mm, the density is (1800-2200) kg / m, and the height is 2-3m. The operating water flow rate is 3-6m / h, and the water-air ratio is 1:2-1:4. This process adopts the method of alternating large and small backwashes for backwashing, and after about 5-7 small backwashes, a large backwash is performed. Both large and small backwashing adopt air-water combined backwashing method. The removal rate of suspended solids is about 80%, the removal rate of COD is about 80%, and the removal rate of ammonia nitrogen is 80-95%.
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