Chloride ion transport and fate in oilfield wastewater reuse by interval dynamic multimedia aquivalence model.

A surface flow constructed wetland was built up to dispose of oilfield wastewater with a high level of inorganic salt ions. Chlorine ion (Cl(-)) was selected as an indicator of soil secondary salinization, and an interval dynamic multimedia aquivalence (IDMA) model was developed to investigate the dynamic multimedia environmental (air, water, soil, flora, and groundwater) effects of Cl(-) in the wastewater irrigation process between 2002 and 2020. The modeled Cl(-) concentrations were in good agreement with the measured ones, as indicated by the interval average logarithmic residual errors (IALREs) being generally lower than 0.5 logarithmic units. The model results showed that the temporal trends of Cl(-) concentrations in the multimedia environments represented a relatively steady state. More than 97.00% of the mass exchange was finished between soil and groundwater compartments, and Cl(-) finally outputted the environmental system by the pathways of advection outflows in the water (71.03%) and groundwater (24.02%). Soil (59.17%) was the dominant sink of Cl(-). It was revealed that the high level of Cl(-) in oilfield wastewater was well treated by the constructed wetland, and there was not a significant environmental effect of soil secondary salinization in the oilfield wastewater reused for the constructed wetland irrigation.

[1]  S. Tao,et al.  Simulating the temporal changes of OCP pollution in Hangzhou, China. , 2007, Chemosphere.

[2]  J. Nakanishi,et al.  Simulation of long-term environmental dynamics of polychlorinated dibenzo-p-dioxins and polychlorinated dibenzofurans using the dynamic multimedia environmental fate model and its implication to the time trend analysis of dioxins. , 2000, Chemosphere.

[3]  D. Mackay,et al.  Evaluating the multimedia fate of organic chemicals: a level III fugacity model , 1991 .

[4]  D. Mackay,et al.  A model of the exchange of inorganic chemicals between water and sediments , 1990 .

[5]  Jingwen Chen,et al.  Application of a level IV fugacity model to simulate the long-term fate of hexachlorocyclohexane isomers in the lower reach of Yellow River basin, China. , 2009, Chemosphere.

[6]  A. Beyer,et al.  Environmental fate and global distribution of polychlorinated biphenyls. , 2009, Reviews of environmental contamination and toxicology.

[7]  Fenglin Yang,et al.  [Dynamic fugacity model for describing the fate of persistent organic pollutants in the river]. , 2006, Huan jing ke xue= Huanjing kexue.

[8]  M. Scheringer,et al.  Multimedia Models of Global Transport and Fate of Persistent Organic Pollutants , 2003 .

[9]  Miriam Diamond,et al.  Application of the QWASI Fugacity/Aquivalence Model to Assessing Sources and Fate of Contaminants in Hamilton Harbour , 1993 .

[10]  D. Mackay,et al.  Application of the QWASI (Quantitative Water Air Sediment Interaction) fugacity model to the dynamics of organic and inorganic chemicals in lakes , 1989 .