Evaluation method for contaminant natural degradation capacity of petrochemical contaminated sites

Abstract

The invention discloses an evaluation method for contaminant natural degradation capacity of petrochemical contaminated sites. The method comprises the following steps: determining DIC and hardness inunderground water at a petrochemical contaminated site, analyzing a leading microorganism type of the underground water of each well in a relational graph of the hardness and the DIC, and then delineating autotrophic microorganism and heterotrophic microorganism leading regions hereby; computing the microorganism degradation DIC consumption at the petrochemical contaminated site according to different microorganism action mechanisms and the DIC-hardness proportion relation, and estimating the site contaminant natural degradation capacity by combining the underground water determined concentration. The conversion conservation of the carbon is used as theoretical basis, the DIC-hardness relation information is deeply explored by consideration of different microorganism metabolisms, and a set of new method for evaluating the petroleum contaminant degradation capacity by only analyzing four indexes of the pH, hardness, alkalinity and free carbon dioxide of the underground water is formed,and the method is highly simple, fast and accurate.

Description

technical field [0001] The invention relates to a method for evaluating the natural degradation ability of pollutants in petrochemical polluted sites. Background technique [0002] Natural attenuation is a potential restoration method for oil-contaminated sites. Natural attenuation relies on natural processes such as biodegradation, dispersion, dilution, volatilization, hydrolysis, and adsorption to achieve the reduction of pollutant concentrations and the restoration of aquifers. Only biodegradation can fundamentally remove pollutants from the aquifer. Therefore, identifying the biodegradability of pollutants in groundwater has become the most important link in natural attenuation restoration. [0003] At present, the main methods for identifying the biodegradation of petroleum pollutants in aquifers include pollutant concentration analysis, electron acceptor analysis, stable isotope analysis, microcosm experiment, microbiology, model simulation, etc. . Pollutant concen...

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Problems solved by technology

Pollutant concentration analysis method requires long-term accurate monitoring and analysis of pollutant concentration, and the technical and time costs are relatively large; electron receptor analysis method is greatly affected by groundwater fluctuations, and there are many electron receptor indicators, and the test cost is high; stable isotope test The cost is high, the principle is complicated, and there are many influencing factors, so it is difficult to apply in the site of multi-source pollution and complex degradation of organic matter; the microcosm experiment uses indoor experiments to simulate the degradation of the site, and it is difficult to characterize the complex site conditions; microbiological methods are only suitable for degrading microbial species It cannot directly show the degradation ability, and the cost of microbial testing is high; the results of model simulation method are greatly affected by the modeling method and parameter acquisition, and it is difficult to popularize

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