Biological filter material based on sulfur-containing tailings as well as preparation method and application thereof

Abstract

The invention relates to a biological filter material based on sulfur-containing tailings as well as a preparation method and application of the biological filter material, and belongs to the technical field of sewage treatment. The biological filter material is prepared by taking sulfur-containing tailings as a raw material, carrying out mechanical force treatment, chemical activation and thermalactivation, compounding the sulfur-containing tailings with sludge biochar prepared from excess sludge, and limestone, and taking aluminum dihydrogen phosphate as a binder. The biological filter material can be used for advanced treatment of secondary effluent with low C/N, no additional organic carbon source is needed, thiobacillus denitrificans are adopted to utilize sulfur in tailings for self-oxidation denitrification, the TN concentration can be reduced to 5 mg/L or below, and the purpose of treating waste with waste is achieved. The sulfur-containing tailings activated by limestone andsludge biochar are used as biofilm carriers, so that the specific surface area of the biological filter material is increased, and the self-oxidation denitrification mass transfer rate of microorganisms is also increased; and aluminum dihydrogen phosphate is used as a binder, so that the operation is convenient, the biological filter material can form a uniform structure, the structural defects ofthe biological filter material are reduced, and the application prospect is good.

Description

technical field [0001] The invention belongs to the technical field of sewage treatment, in particular to a biological filter material based on sulfur-containing tailings and its preparation method and application. Background technique [0002] Excessive use of nitrogen fertilizers in agriculture and the discharge of domestic sewage and industrial wastewater lead to a large amount of nitrogen entering the water environment. High levels of nitrogen cause water eutrophication and degradation of water environment quality, threatening human health. In order to strengthen urban domestic pollution control and speed up the construction and renovation of urban sewage treatment facilities, a series of water environment treatment work has been launched, including comprehensive treatment of human lakes and rivers, urban non-point source pollution control, and upgrading of sewage treatment plants. Among them, the upgrading and transformation of urban sewage treatment plants is to furthe...

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Problems solved by technology

[0004] Sulfur-containing tailings are low-grade sulfur-containing ores left after mining, and are prone to weathering under the action of natural forces. When surrounding rock groundwater, small streams (mountain springs) and precipitation flow through leaching, the physical, chemical and biological Acidic wastewater that seriously affects the surrounding ecological environment and human health is produced under the action of acidic wastewater, and there is currently no good way to absorb it

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