Method for predicting exposure level of organic chemicals in wastewater aerobic treatment system

Abstract

The invention discloses a method for predicting the exposure of chemicals in a wastewater aerobic treatment system (referred to as STP (O)). By adopting the wastewater aerobic biochemical treatment system as a basic process, according to symbiotic relationship among gas, water, suspended solids and sludge environmental media and the mass flow process of the chemicals, an STP (O) conceptual model is constructed and the prediction of the exposure level is completed by virtue of default environmental exposure scene parameters and only need of inputting the molecular weight, the vapor pressure (P), the water solubility (S), the aerobic biodegradation rate (k5), adsorption coefficient (Koc) and emissions (ERC) of the chemicals. The prediction method is simple, less in measured parameters and higher in prediction accuracy and is of important significance of exposure risk assessment of chemicals.

Description

technical field [0001] The invention relates to the field of chemical environmental risk assessment, and relates to an exposure prediction method for an organic chemical wastewater aerobic treatment system. Background technique [0002] my country is a big country in the research and development, production and use of chemicals. In addition to more than 45,000 existing chemical substances, thousands of new chemical substances are put into use every year. Sewage treatment plant (STP) is the key link for chemicals to enter the environment. Easily degradable chemicals can basically be completely removed in STP, but refractory chemicals are difficult to degrade after STP treatment, and some of them volatilize into the atmosphere and are Sludge adsorption and residual chemicals are discharged into the receiving water body with the secondary effluent, which has potential ecotoxic effects on the ecological environment, especially the aquatic ecosystem. [0003] At present, my coun...

AI Technical Summary

Problems solved by technology

[0006] Byrns constructed a static prediction model for the fate of exogenous chemicals in STP. This model adopts the primary sedimentation-aeration process, does not include secondary sedimentation tanks, and the simulation of chemical fate is relatively simple, without considering aeration volatilization etc. (Byrns G.The fate of xenobiotic organic compounds in wastewater treatment plants.Water Research,2001,35(10):2523-33.)

Images