Composite biological filler as well as preparation method and application thereof

Abstract

The invention relates to a composite biological filler. The composite biological filler comprises lignocellulose, a metal substance, oligosaccharide and a biological enzyme. The preparation method of the composite biological filler comprises the following steps: modifying lignocellulose through oligosaccharide and biological enzyme to obtain a modified lignocellulose material; pickling and drying the metal substance; and mixing the modified lignocellulose material with a metal substance. The invention relates to an application of a composite biological filler in nitrogen and phosphorus removal. Lignocellulose is used as a slow-release carbon source and a biofilm formation carrier, and can release organic matters as electron donors for denitrification of denitrifying bacteria under the action of water soaking and microorganisms, so that nitrate nitrogen is reduced into nitrogen, and sewage denitrification is realized; the redox potential of the water body is reduced by metal substances, and a reduction environment which is more beneficial to the survival of denitrifying bacteria is created; the composite biological filler is mainly used for efficient nitrogen removal of domestic sewage, river and lake water bodies, aquaculture wastewater and the like, and has a certain phosphorus removal function.

Description

technical field [0001] The invention relates to the technical field of water treatment, in particular to a composite biological filler and its preparation method and application. Background technique [0002] Nitrogen pollution is one of the most serious problems faced by various water bodies in my country. my country's current highest total nitrogen discharge standard is Class A (GB18918-2002), but the Class A total nitrogen limit (≤15mg / L) is the surface water Class IV (total nitrogen ≤ 1.5mg / L), its secondary pollution to the water body cannot be ignored, especially when the discharged water body is a closed water body, it is even more difficult to meet the water quality requirements, so economical and efficient deep denitrification is urgently needed technology. In addition, with the continuous development of my country's economy, the increase in the use of nitrogen and phosphorus substances, and the use of a large number of agricultural chemical fertilizers have led to a...

AI Technical Summary

Problems solved by technology

However, most natural cellulose materials have low mechanical strength and short service life

Since the plant carrier may block the system after the release period is over, it is generally necessary to set up a separate dosing area for future maintenance and operation. Therefore, if the life of the filler is too short and the mechanical strength is insufficient, the cost and difficulty of operation and maintenance will increase.

In addition, the total nitrogen removal rate of pure cellulose carbon source materials is difficult to reach more than 70% in practical applications. In order to achieve deep and stable removal of total nitrogen, its denitrification effect needs to be improved.

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