Built-in three-dimensional denitrification and dephosphorization composite system

Abstract

The invention relates to the technical field of nitrogen and phosphorus removal, and especially relates to a built-in three-dimensional denitrification and dephosphorization composite system. The system comprises a denitrification nitrogen removal filter column and a denitrification and dephosphorization filter column, the upper side of the interior of the denitrification nitrogen removal filter column is filled with corncobs, the upper side of the interior of the denitrification and dephosphorization filter column is filled with a sponge iron and sulfur composite filler, the sulfur-iron composite filler formed by mixing sulfur and sponge iron has unique advantages in the aspect of deep denitrification and dephosphorization of tail water with a low C / N ratio, H2 and Fe<2+> generated by sponge iron corrosion can be used as electron donors for denitrification nitrogen removal, sulfur is synergistically used as a sulfur autotrophic denitrification electron donor, the electron donor deficiency in the denitrification nitrogen removal process of the tail water with the low C / N ratio is jointly made up, besides, Fe<2+> and Fe<3+> generated by corrosion of sponge iron and hydrolysates Fe(OH) and FeOOH of Fe<2+> and Fe<3+> have relatively strong adsorption precipitation capability on PO4<3->, and finally, phosphorus is removed in the form of FePO4, polynuclear hydroxyl iron phosphate and the like, so that the sulfur-iron composite filler can achieve the purpose of deep phosphorus removal and synchronous nitrogen removal of tail water with low C / N ratio.

Description

technical field [0001] The invention relates to the technical field of nitrogen and phosphorus removal, in particular to a built-in three-dimensional nitrogen and phosphorus removal composite system. Background technique [0002] The tail water of urban sewage treatment plants has problems such as low C / N ratio and difficulty in denitrification and phosphorus removal simultaneously. The solid-phase cellulose carbon source has the advantages of wide sources, low price and good denitrification effect, and is widely used in low C / N ratio. In the process of denitrification and denitrification of sewage and groundwater, some studies have shown that compared with other cellulose crops such as husks, rice straw and cotton, corn cobs after alkali treatment have long-lasting carbon source release, good microbial adhesion, and denitrification. It is more suitable as a filling carbon source for denitrification filter. However, the release of carbon source and the effect of denitrificat...

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Problems solved by technology

[0002] The tail water of urban sewage treatment plants has problems such as low C / N ratio and difficulty in denitrification and phosphorus removal simultaneously. The solid-phase cellulose carbon source has the advantages of wide sources, low price and good denitrification effect, and is widely used in low C / N ratio. In the process of denitrification and denitrification of sewage and groundwater, some studies have shown that compared with other cellulose crops such as husks, rice straw and cotton, corn cobs after alkali treatment have long-lasting carbon source release, good microbial adhesion, and denitrification. It is more suitable as a filling carbon source for denitrification filter. However, the release of carbon source and the effect of denitrification and denitrification will decrease with time, and the goal of simultaneous and efficient phosphorus removal of nitrogen and denitrification cannot be achieved. Therefore, this scheme proposes a A built-in three-dimensional nitrogen and phosphorus removal compound system

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