Method for detecting polycyclic aromatic hydrocarbon component in coking wastewater processing system

Abstract

The invention relates to a method for detecting polycyclic aromatic hydrocarbon component in a coking wastewater processing system, belonging to the technical field of analysis and detection of toxic pollutants in environmental monitoring. The detection method is composed of three steps: solvent extraction, extract liquor purification and gas chromatograph-mass spectrometer detection. Firstly, a pressure solvent extraction system is used for quickly extracting polycyclic aromatic hydrocarbon component in the residual sludge in the coking wastewater processing system under the condition of heating and pressurizing; then, a silica gel / alumina composite layer column is adopted to separate and purify extract liquor; and finally, collected leacheate is concentrated to proper volume, and the gas chromatograph-mass spectrometer is used for detection analysis under the condition of selecting ion modes. The invention has short time consumption for extraction, uses small amounts of extracting solvent, can effectively remove polar and nonpolar interfering components in sludge in the purification process, has high sensitivity and stable operation, can accurately and quantificationally analyze trace polycyclic aromatic hydrocarbon in the residual sludge in the coking wastewater processing system.

Description

technical field [0001] The invention relates to an analysis method for detecting polycyclic aromatic hydrocarbon components in residual sludge of a coking wastewater biological treatment system, and belongs to the technical field of analysis and detection of toxic pollutants in environmental monitoring. Background technique [0002] Polycyclic aromatic hydrocarbons are a class of hydrocarbons composed of two or more benzene rings arranged in a linear, angular or clustered form. Among them, 16 polycyclic aromatic hydrocarbons are included in the list of priority pollutants by the US Environmental Protection Agency, and 7 are classified as B2 carcinogens (based on the results of a large number of animal experiments, they are considered to be very likely to be human carcinogens). Coking wastewater contains high concentrations of PAHs, which is the main source of PAHs in the environmental media near coking plants. During the biological treatment of coking wastewater, the lipoph...

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Problems solved by technology

[0003] Most of the existing PAH analysis methods are for drinking water, sediment, soil and other environmental media. There are few analysis methods for PAH in the residual sludge of the biological treatment system, and almost all of them are for the domestic sewage biological treatment system. sludge

Compared with the above-mentioned media, the residual sludge of the coking wastewater biological treatment system has complex components and many interfering components. Therefore, how to achieve effective removal of interfering components in activated sludge and efficient recovery of target polycyclic aromatic hydrocarbons is an analysis Key issues to be solved urgently for polycyclic aromatic hydrocarbons in excess sludge of coking wastewater biological treatment system

At present, there is no report on the analysis method of trace polycyclic aromatic hydrocarbons in the residual sludge of coking wastewater biological treatment system

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