Device and method for removing precursors of halogenated aldehyde disinfection byproduct

Abstract

The invention discloses a device and method for removing precursors of a halogenated aldehyde disinfection byproduct. The device comprises a medication mixing tank reaction system and a biological aerated filter processing system, wherein the medication mixing tank reaction system is used for mixing potassium permanganate, chlorine dioxide and to-be-treated raw water, compounding and pre-oxidizing the raw water by virtue of potassium permanganate and chlorine dioxide and removing partial precursors of the halogenated aldehyde disinfection byproduct; and the biological aerated filter processing system is used for further removing the precursors of the halogenated aldehyde disinfection byproduct in compounded and pre-oxidized water by virtue of absorption of a filling and degradation of microorganisms and is connected with the medication mixing tank reaction system through a pipeline. The device has the beneficial effects that process assemblies are compactly distributed and occupy a small space, processes are mutually coordinated and functionally complemented, and the precursors of the halogenated aldehyde disinfection byproduct can be effectively removed, so that the risk that the halogenated aldehyde disinfection byproduct exceeds the standard is reduced.

Description

technical field [0001] The invention belongs to the technical field of drinking water treatment, and in particular relates to a device and method for removing precursors of halogenated aldehyde disinfection by-products. Background technique [0002] Chlorine-based disinfectants are still the most widely used disinfectants in drinking water treatment. While ensuring the microbial safety of drinking water, chlorine disinfection can react with organic matter in drinking water to generate a variety of chlorinated disinfection by-products. More than 700 kinds of by-products of chlorination disinfection have been found so far, which pose serious hazards to human health. The content of halogenated aldehyde disinfection by-products in drinking water is the third largest type of disinfection by-products, second only to trihalomethanes and haloacetic acids, and haloacetaldehyde is far more harmful to the human body than trihalomethanes and haloacetic acids. [0003] With the rapid de...

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Problems solved by technology

[0006] However, chemical pre-oxidation can only oxidize and decompose macromolecular organic substances into small molecular organic substances because the oxidizing ability of the oxidant is not enough to completely mineralize organic matter, and these small molecular organic substances are likely to be precursors of halogenated aldehyde disinfection by-products , so the use of pre-oxidation technology alone may increase the formation potential of halogenated aldehyde disinfection by-products

[0007] If the biological aerated filter is directly used as a pretreatment process for raw water, the larger particulate impurities and suspended solids in the raw water may block the filler, which will reduce the water passing capacity of the biological aerated filter, thereby reducing the working cycle of the filter and increasing the efficiency. The frequency of backwashing of large filters increases the operating cost of the water plant

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