title: Experimental and modeling study of pure terephthalic acid (PTA) wastewater transport in the vadose zone.
abstract: PTA wastewater discharged from a factory was selected as the research object in this project and CODcr was selected as the characteristic pollution factor. Static adsorption and soil column leaching experiments of silty clay and clayey soil were carried out to study the adsorption, bio-degradation and dispersion coefficient of CODcr in PTA wastewater. Hydrus-1D was used to build the convection-diffusion model to demonstrate the migration of PTA wastewater in the vadose zone. The results indicate that silty clay and clayey soil in the vadose zone can adsorb, degrade and impede the contaminants in PTA wastewater; however, the coefficient of adsorption and degradation were very low, they were down to 0.0002 L g(-1), 0.0003 L g(-1) and 0.0097 d(-1), 0.0077 d(-1) for silty clay and clayey soil, respectively. Under the virtual condition that, wastewater in the sewage pool is 5 m deep, CODcr concentration is 4000 mg L(-1), vadose zone is 21 m, PTA wastewater will reach the phreatic surface after 20.87 years. When wastewater in the sewage pool is 7 m with other conditions unchanged, after 17.18 years PTA wastewater will reach groundwater. The results show that there is a higher pollution risk for groundwater if we do not take any anti-seepage measures.
authors.affiliation: Institute of Hydrogeology and Environmental Geology, Zhonghua street No. 268, Shi Jiazhuang, hebei, China. wangcuiling1227@163.com.
authors.forename: Cuiling
authors.initials: C
authors.lastname: Wang
authors.forename: Changli
authors.initials: C
authors.lastname: Liu
authors.forename: Lixin
authors.initials: L
authors.lastname: Pei
authors.forename: Yajie
authors.initials: Y
authors.lastname: Pang
authors.forename: Yun
authors.initials: Y
authors.lastname: Zhang
authors.forename: Hongbing
authors.initials: H
authors.lastname: Hou
mesh_terms: D000327:Adsorption; D000538:Aluminum Silicates; D000077215:Clay; D060587:Groundwater / Q000737:chemistry*; D008956:Models, Chemical; D010795:Phthalic Acids / Q000032:analysis* / Q000737:chemistry; D012987:Soil; D062065:Wastewater / Q000737:chemistry*; D014874:Water Pollutants, Chemical / Q000032:analysis* / Q000737:chemistry
chemical_list: D000538:Aluminum Silicates; D000077215:Clay; D010795:Phthalic Acids; D012987:Soil; D062065:Wastewater; D014874:Water Pollutants, Chemical; C011363:terephthalic acid