Tahereh Jasemizad

Conducting polymers can be used as photocatalysts for aqueous contaminant remediation; however, if prepared using an iron source as an oxidant and/or dopant, they may suffer from leaching of iron during photocatalysis and misinterpretation of the results.

This annual review covers the literature published in 2017 on topics related to the occurrence and fate of emerging environmental pollutants in wastewater. Due to the vast amount of literature published on this topic, we have discussed only a portion of the quality research publications, due to the limitation of space. The abstract search was carried out using Web of Science, and the abstracts were selected based on their relevance. In few cases, full‐text articles were referred to better understand new findings. This review is divided into the following sections: antibioticresistant bacteria (ARBs) and antibiotic‐resistant genes (ARGs), disinfection by‐products (DBPs), estrogens, pesticides, pharmaceuticals and personal care products (PPCPs), and microplastics, a new section added this year.

Despite many efforts to remove humic acid (HA) in water resources, this problem is not overcome, especially in underdeveloped countries. The aim of this study is to evaluate the effects of inorganic anions (Cl⁻, , , and ) as radical scavenger on the efficacy of electron beam (EB) irradiation for the removal of HA from aqueous solutions. In this study, stock HA solution was prepared in alkaline condition; furthermore, different concentrations of anions were added to all HA samples. Here, the effect of different electron beam absorbed doses (1, 3, 6, 9, and 15 kGy) on the removal of HA is studied. HA concentration was measured using UV–vis spectrophotometer at 254 nm. The results showed that by increasing absorbed dose from 1 to 15 kGy, HA removal efficiency increased from 28.2 to 77.7%, respectively. While, by increasing different inorganic anion concentrations from 25 to 100 mg/L, the removal efficiency decreased. According to the results, nitrate has more inhibitory effect on the hydroxyl free radicals and HA removal efficiency in the presence of EB irradiation compared with chloride, bicarbonate, and sulfate anions. Furthermore, the kinetic model fitted the pseudo-second-order kinetics well.

Journal of Environmental Health Enginering مجله مهندسی بهداشت محیط