Biological aerated filter filtering material for treating sewage and preparation method thereof

Abstract

The invention essentially relates to a filter material for treating sewage, in particular to relate to a filtering material used in the sewage process technique of aeration biology filtering pool. The filtering material of sewage process of the aeration biology filtering pool is characterized in that the components of the raw material of the filtering material consists of by fly ash of 60 to 75 percent, portland cement of 10-20 percent, quick lime of 10-20 percent, gypsum 3-5 percent and degreasing aluminum powder of 0.06-0.08 percent. The preparation includes the following steps of pulping, stirring, pouring, cutting forming and ball milling. Under the optimal proportion of the air and water and the optimal water force load, the life sewage is treated by the aeration biology filtering pool with adding the fly ash to the gas concrete particle. When the average concentration of the water inlet is 176mg / L, the average removal rate of the CODis 75.3 percent, the average concentration of water inlet is 42.7mg / L, the average removal rate of the NH3-N is 96.4 percent, the average concentration of the water outlet is 0.87mg / L which meets the GB18918-2002 grade A standard of the sewage discharging.

Description

Technical field: [0001] The invention mainly relates to a filter material for treating sewage, in particular to a filter material used in the sewage treatment process of an aerated biological filter. Background technique: [0002] In the sewage treatment process of the biological aerated filter, the filter material can be divided into two types with a density greater than 1 and less than 1 according to the density. At present, the main materials used to make the filter material are activated carbon, quartz sand, ceramsite and zeolite. Hard materials and organic hard materials such as polystyrene, polyethylene, polypropylene, PVC, etc. Most inorganic filter materials have relatively good mechanical strength and large specific surface area, such as activated carbon, which is 500-900m 2 / g, zeolite is 10.2~15.0m 2 / g, ceramsite is 3.1 ~ 4.2m 2 / g; but most of the inorganic filter material density is too high, such as quartz sand is 2.5 ~ 2.7g / cm 3 , Zeolite is 2.0~2.3g / cm ...

AI Technical Summary

Problems solved by technology

Most inorganic filter materials have relatively good mechanical strength and large specific surface area, such as activated carbon, which is 500-900m 2 / g, zeolite is 10.2~15.0m 2 / g, ceramsite is 3.1 ~ 4.2m 2 / g; but most of the inorganic filter material density is too high, such as quartz sand is 2.5 ~ 2.7g / cm 3 , Zeolite is 2.0~2.3g / cm 3 , ceramsite 2.5 ~ 2.6g / cm 3 , resulting in relatively large energy consumption during process operation and backwashing; the density of organic filter material is moderate, such as plastic packing is 1.38g / cm 3 , fiber ball is 1.38g / cm 3 , Pall ring is 0.45 ~ 0.67g / cm 3 , is currently a promising filter material, but the specific surface area of ​​most organic filter materials is relatively small and expensive, such as the Pall ring is 66 ~ 350m 2 / m 3 , step ring is 63 ~ 108m 2 / M 3 , PVC honeycomb packing is 99 ~ 236m 2 / m 3 , resulting in lower process efficiency and higher equipment costs

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