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| Application of 3MRA model in the decision-making for comprehensive chrome residue treatment |
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Abstract Multimedia, multipathway and multireceptor risk assessment model (3MRA), a waste risk assessment model currently used by USEPA, was applied to assess the environmental risks of chrome residue management project in a chromic salt factory. During the assessing process, the environmental risks before and after management in this area were simulated; meanwhile the pollutant exposure pathways and the harm sufferers were also analyzed. The feasibility of the scheduled treatment methods was verified by this model. The simulation results showed that under the condition of 95% protected objects and 95% confidence level, chrome residue stacks brought significant environmental risk to this area; the carcinogenic risk level of neighboring residents came to the order of 10-4, the hazard quotient of aquatic ecology risk was above 1. The environmental risk decreased sharply after the detoxified landfill of chrome residues, which verified the feasibility of such treatment.
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Received: 09 June 2009
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