Solid-phase denitrification coupling carrier for simultaneous denitrification and carbon removal

Abstract

The invention belongs to the technical field of solid-phase denitrification, and particularly relates to a solid-phase denitrification coupling carrier for simultaneous denitrification and carbon removal. The solid-phase denitrification coupling carrier is prepared from biodegradable carriers and suspension filling materials through being coupled. The biodegradable carriers and the suspension filling materials are coupled; the specific surface area of the biodegradable carriers and the suspension filling materials is great; a biological membrane can be better attached; microbes can be enriched; microbes enriched on two kinds of carriers have different emphasis on the contaminant removal; the biodegradable carriers have a good effect on the denitrification; the suspension filling materials have good effects on removing organic matters. By using the coupling carriers, agricultural wastes can be recovered and utilized; the denitrification performance is enhanced; the quantity of the enriched microbes is increased; in addition, the goals of synchronously removing organic matters and reducing the outlet water organic matter content are achieved; the generation of secondary pollution is avoided.

Description

technical field [0001] The invention belongs to the technical field of solid phase nitrification, and in particular relates to a solid phase nitrification coupling carrier for synchronous denitrification and carbon removal. Background technique [0002] For problems such as eutrophication caused by nitrogen pollution in agricultural runoff, biological denitrification technology has received greater attention. However, due to the low carbon and nitrogen ratios in agricultural runoff, it is difficult to achieve a good denitrification effect only by using internal carbon sources, so it is necessary to add external carbon sources. Traditional carbon sources mainly include liquid low-molecular carbon sources such as methanol, ethanol, and glucose. Although good application results have been achieved, some problems have also been found during the application process, such as: complicated operation and management, difficult control of dosage, and The equipment is complex, and the ...

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Problems solved by technology

However, due to the relatively low carbon and nitrogen in agricultural runoff, it is difficult to achieve a good denitrification effect only by using internal carbon sources, so it is necessary to add external carbon sources

Traditional carbon sources mainly include liquid low-molecular carbon sources such as methanol, ethanol, and glucose. Although good application results have been achieved, some problems have also been found during the application process, such as: complicated operation and management, difficult control of dosage, and The equipment is complicated, and the liquid carbon source is easy to lose, which is easy to cause secondary pollution, etc.; the solid carbon source is released slowly, runs stably, and is not easy to cause secondary pollution, and can be used as a biofilm carrier. It is called "solid phase nitrification" technology

In recent years, many researchers have used solid carbon sources as a substitute for liquid carbon sources in the denitrification process. These solid carbon sources include artificially synthesized polymers (PLA, PCL, etc.), biosynthesized polymers ( PHAs, etc.) and some natural materials, but the cost of artificially synthesized polymers and biosynthetic polymers is relatively high, which is not conducive to industrial applications. Although natural materials are cheap and easy to obtain, they have the disadvantages of increasing organic content and chroma in effluent when used alone

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