Biological aerated filter filtering material for treating sewage and preparation method thereof
A technology of biological aerated filter and filter material, which is applied in the direction of sustainable biological treatment, biological water/sewage treatment, sustainable waste treatment, etc. Major and other issues
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[0044]Example 1, a filter material for sewage treatment in a biological aerated filter, including 60% fly ash, 15% Portland cement, 20% quicklime, 4.94% gypsum, 0.06% degreased aluminum powder, and the ratio of water to material: 0.7.
[0045] In the filter material for sewage treatment of the biological aerated filter, the particle size of the filter material is 4-12 mm.
Example Embodiment
[0046] Example 2, a filter material for sewage treatment in a biological aerated filter, including fly ash 70%, Portland cement 10%, quicklime 15%, gypsum 4.92%, degreased aluminum powder 0.08%, water to material ratio: 0.7, foam stabilizer and other regulators are also added.
[0047] The raw materials should meet the following requirements:
[0048] 1. Fly ash: it should meet the requirements of Class I and Class II fly ash in the "Fly Ash for Silicate Building Products" (JC409-1991) standard, with a fineness of less than 8%-15% (80um square hole sieve) Sieve residue).
[0049] 2. Quicklime: A-CaO (effective calcium oxide) 50%-65%, MgO<8%, digestion speed 10-30min, digestion temperature 50-70℃, fineness <15% (80um square hole sieve residue).
[0050] 3. Cement: Portland cement and ordinary Portland cement are suitable
[0051] 4. Plaster: SO 3 >40%, fineness <17% (80um square hole sieve residue)
[0052] 5. Aluminum powder: There are two types of greased dry aluminum powder and ...
Example Embodiment
[0055] Example 3, a filter material for sewage treatment in a biological aerated filter, including 75% fly ash, 10% Portland cement, 10% quicklime, 4.96% gypsum, 0.06% defatted aluminum powder, and the ratio of water to material: 0.6.
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