Coal ash biological filter material and preparation method of coal ash biological filter material

Abstract

The invention discloses a coal ash biological filter material and a preparation method of the coal ash biological filter material. The coal ash biological filter material comprises the following ingredients in percentage by mass: 86 percent to 95 percent of coal ash, 3 percent to 10 percent of lutaceous coal gangue, 0.5 percent to 10 percent of bonding agents and 1 percent to 3 percent of expanding agents. The preparation method of the coal ash biological filter material disclosed by the invention comprises the following steps that: 1) the coal ash is crushed and finely ground, and then, the coal ash, the lutaceous coal gangue, the bonding agents and the expanding agents are proportionally metered and mixed; 2) water is added into the mixture and stirring is carried out until the mixture is uniform, cores and balls are formed, and raw material balls are formed; 3) the raw material balls are fed into sintering equipment to be sintered, and the coal ash biological filter material is prepared. The bonding agents and the expanding agents are added, the coal ash activity is ffulfilled and enhanced, the filter material intensity is enhanced, the specific surface area of the filter material is high, the porosity is high, in addition, the raw materials are all solid wastes, the goal of waste recovery and utilization is reached, and the preparation cost of the filter material is low.

Description

technical field [0001] The invention relates to an artificial environment-friendly filter material for an aerated biological filter, in particular to a fly ash biological filter material and a preparation method thereof. Background technique [0002] Biological aerated filter is a new type of biological sewage treatment technology that combines biological oxidation mechanism with deep bed filtration mechanism. In recent years, it has been widely used in AB method, AO method, A / A / O method, SBR method, oxidation It can also be used alone in sewage treatment processes such as ditch method and integrated pool method. The role of the filter material in the biological aerated filter is very important. Since OTV, a subsidiary of the French CGF company, first developed the aerated biological process, it has adopted a new type of circular granular filter material (artificial ceramsite). On the one hand, it provides a place for microbial growth, and on the other hand, it can intercep...

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Problems solved by technology

[0003] The existing filter materials for biological aerated filter include clay ceramsite, pumice, quartz sand, etc. Among them, clay ceramsite has the best performance, and clay ceramsite filter materials generally use clay, fly ash (slag) and internal combustion However, the specific surface area of ​​clay ceramsite is low, the porosity is not high, and clay is a non-renewable resource, the source of raw materials is limited, and the cost is high

The patent document with the publication number CN102060457A discloses a method of using waste fly ash and coal gangue to prepare a biological aerated filter filter material. The method uses coal gangue as the internal combustion agent and binder of fly ash sintered ceramsite. It can replace the existing clay ceramsite; however, the specific surface area of ​​the filter material prepared by this method is still low, the porosity is not high, and the admixture added to enhance the strength of the filter material is a non-renewable resource, which has not been fully adopted The purpose of solid waste; in addition, this method makes the raw meal balls evaporate water at 100°C and 200°C, which is prone to the phenomenon of raw meal balls exploding and bursting, which will affect the porosity of the finished filter material. The sintering temperature of this method is Above 1000°C, a hard shell will form on the surface of the filter material, which is not conducive to the growth of biological bacteria

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