Polycyclic aromatic hydrocarbons in road-deposited sediments, water sediments, and soils in Sydney, Australia: Comparisons of concentration distribution, sources and potential toxicity

Abstract

• Dynamic adsorption of P from water and wastewater by Zr(IV)-loaded okara was tested.• Effects of column design parameters on the adsorption performance were investigated.• The dynamic adsorption capacity of Zr(IV)-loaded okara for P was reasonably high.• The spent column was effectively regenerated with 0.2 M NaOH followed by 0.1 M HCl.• Zr(IV)-loaded okara column was efficient in eliminating P from municipal sewage. This study explores the potential of removing phosphorus from aqueous solutions and sewage by Zr(IV)-loaded okara (ZLO) in the fixed-bed column. Soybean residue (okara) was impregnated with 0.25 M Zr(IV) solution to prepare active binding sites for phosphate. The effect of several factors, including flow rate, bed height, initial phosphorus concentration, pH and adsorbent particle size on the performance of ZLO was examined. The maximum dynamic adsorption capacity of ZLO for phosphorus was estimated to be 16.43 mg/g. Breakthrough curve modeling indicated that Adams-Bohart model and Thomas model fitted the experimental data better than YoonNelson model. After treatment with ZLO packed bed column, the effluent could meet the discharge standard for phosphorus in Australia. Successful desorption and regeneration were achieved with 0.2 NaOH and 0.1 HCl, respectively. The results prove that ZLO can be used as a promising phosphorus adsorbent in the dynamic adsorption system. a b s t r a c t a r t i c l e i n f o

Traffic-Related Pollutants in Roadside Soils of Different Countries in Europe and Asia

“…The lowest values of ∑PAHs were determined in the samples from Gliwice and Ulm (3047 and 3849 μg kg −1 , respectively). The PAHs were dominated by high molecular weight compounds (four to six rings) with fluoranthene, pyrene, and chrysene being the most abundant ones, which is similar to the previous studies of roadside soils (Khan et al 2008;Wang et al 2009;Long et al 2011;Nguyen et al 2014). The individual analyses of PAHs revealed very high contents of fluoranthene (6951 μg kg −1 ), pyrene (5717 μg kg −1 ), chrysene (4184 μg kg −1 ), benzo(b +k)fluoranthene (4478 μg kg −1 ), and phenanthrene (3043 μg kg −1 ) in the samples from Böblingen, Tübingen, Dushanbe, and Zabrze (Fig.…”

Source apportionment of PAHs in surface sediments using positive matrix factorization combined with GIS for the estuarine area of the Yangtze River, China

“…This group of elements included only highmolecular-weight PAHs with four to six rings. According to the literature, BbF, BgP, and BaP are related to the emission characteristics of PAHs from vehicle emissions and Pyr is mainly derived from the gasoline and fossil fuel combustion of ships Cao et al, 2011;Nguyen et al, 2014). Factor 1 might represent a source of gasoline and fossil fuel combustion.…”

Aliphatic and polycyclic aromatic hydrocarbons risk assessment in coastal water and sediments of Khark Island, SW Iran

“…PAHs are produced by a wide range of processes including: the high temperature combustion of fossil fuels and biomass, volcanic eruptions, forest fires, oil spills, petrol and diesel leaks, domestic and industrial wastes and biological production Lourenço et al, 2013;Nguyen et al, 2014;Schintu et al, 2015). Like the PAHs, the origins of AHs may be marine oil and gas exploration, atmospheric deposition (dry and/or wet), municipal and industrial discharges, accidental spills, riverine input and waste incineration (Guigue et al, 2014a;Manuel Nicolaus et al, 2015;Schintu et al, 2015;Zhou et al, 2014).…”

“…Recently and due to rapid economic development and industrialization, the persistent organic pollutants such as aliphatic hydrocarbons (AHs) and polycyclic aromatic hydrocarbons (PAHs), have highly concentrated in the coastal environments (Kapsimalis et al, 2014). There is a major concern regarding the organic pollutants because of their low water solubility in natural condition, none or poor biodegradability, high persistence, toxicity, and bioaccumulation and biomagnification through the food chain in aquatic ecosystem (Bastami et al, 2013;Li et al, 2015a;Migani et al, 2015;Nguyen et al, 2014).…”