Preparation method of encapsulated solid-phase slow-release composite carbon source

Abstract

A preparation method of an encapsulated solid-phase slow-release composite carbon source belongs to the technical field of preparation of carbon sources. PVA (polyvinyl alcohol) and starch are selected as release base material of a solid-phase carbon source, encapsulation is used as a release method, a soluble carbon source sodium acetate is encapsulated by the encapsulation technology, the low-temperature freeze-drying technology is used for forming, and the encapsulated solid-phase slow-release composite carbon source is prepared. The problems of poor quality and low denitrification efficiency at the initial stage of reaction are solved, and the defect of independent use of two carbon sources is overcome.

Description

technical field [0001] The invention belongs to the technical field of carbon source preparation, and is applied to biological denitrification and denitrification of regenerated water, and can be used for deep denitrification of sewage and technical research and development of regenerated water quality safety assurance, and can also be used for biological denitrification and denitrification of groundwater. Background technique [0002] (1) External carbon sources commonly used in biological denitrification process [0003] The carbon source has always been the controlling factor in the deep biological denitrification process of sewage, especially for the denitrification and denitrification treatment of the secondary biological treatment effluent of the sewage plant with a high degree of nitrification and low concentration of organic matter, it is often necessary to add an external carbon source to provide denitrifying microorganisms Energy required for metabolism. [0004] ...

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Problems solved by technology

However, this type of substance also has some disadvantages that cannot be ignored: it has certain biological toxicity. For example, although the efficiency of methanol denitrification is high, its own toxicity will cause potential danger to the environment; the dosage is not easy to control, and when the dosage is low The denitrification effect is affected, and when the dosage is high, it will cause the effluent COD to exceed the standard, which will affect the quality of the effluent; the operation cost is high, continuous dosing is required, and a special carbon source dosing device is equipped

[0019] At present, there is no report on the combined use of starch, polyvinyl alcohol blended solid-phase carbon source and soluble carbon source as an encapsulated solid-phase slow-release composite carbon source for biological denitrification.

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