Ultra-permeable nanofiltration membranes with superior scaling and fouling resistance for petrochemical wastewater reclamation

Nitrogen recovery and removal technologies for petrochemical wastewater: A comprehensive review of pretreatment, biological processes, and integrated physicochemical–biological processes

Naphthenic acid fraction compounds (NAFC) are prevalent in petrochemical wastewater, including from oil sands processing, and induce reactive oxygen species (ROS) emissions in isolated mitochondria. The purpose of this study was to verify if a primary carboxylic acid, the moderately hydrophobic NAFC 3,5-dimethyladamantane-1-acetic acid, would cause the mitochondrial ROS (hydrogen peroxide; H2O2) production and affect its consumption by mitochondria in multiple bioenergetic states. Intact mitochondria isolated from rainbow trout (Oncorhynchus mykiss) liver were exposed to commercially available 3,5-dimethyladamantane-1-acetic acid. The emission of ROS during States 3 and 4 respiration was quantified using fluorometry with an Oroboros fluorespirometer. Subsequently, select ROS emission sites in the mitochondrial complexes were isolated using inhibitors, and the ROS emission of each site was measured using the Amplex UltraRed-horseradish peroxidase (AUR-HRP) system. The compound 3,5-dimethyladamantane-1-acetic acid was equally potent in causing ROS emission in State 3 and State 4 ROS sites. The baseline (no NAFC) proportion of ROS emission by site was IIF > IQ > IIIQo > IF. The 3,5-dimethyladamantane-1-acetic acid compound increased ROS emission in a dose-dependent manner at IIF with an EC50 of 0.2 mM, which was not significantly different than the State 3 and 4 Oroboros response. In contrast, there was no consistent concentration-effect response at the other three ROS sites (IQ, IIIQo, and IF). Malonate, an inhibitor of succinate dehydrogenase, eliminated ROS production in Oroboros experiments. These findings identify site IIF as the predominant source of NAFC-stimulated ROS and provide mechanistic insight into how adamantane-type NAFCs impair mitochondrial redox balance in fishes.

Compositional heterogeneity in metal/nitrogen-doped carbons (M-N-Cs) complicates the fundamental elucidation of the intricate interplay between the active metal species that rule the reactivity of single atomic catalysts (SACs). This study unveils the electronic disruptions of cobalt nanoparticles (Co NPs) to the catalytic behaviors of cobalt single-atom (Co SA). The intense electronic communications between high-density Co NPs and Co SA sites lead to dissociation O3 on the high-spin Co SA sites to generate surface-confined hydroxyl radicals (•OH). However, the tandem electron transfer yields superoxide radical (O2•–) with low reactivity and remarkably reduce ozone utilization efficiency (OUE). In contrast, independent Co SA sites far or free from adjacent Co NPs induce a nonradical O3 activation regime, which markedly improves electron utilization efficiency (~2.9-fold), OUE ( ~ 3.0-fold), and turnover frequency (TOF, ~2.5-fold) of Co SA. The nonradical catalytic ozonation process demonstrates high adaptability to complex water matrices and maintains long-term stability in the treatment of real petrochemical wastewater. The deciphered electronic interplays between metal nanoparticles and single atom sites advance a new paradigm to regulate the selectivity of single atom catalysis.

Efficient fluoride removal from petrochemical wastewater by in-situ schwertmannite formed via oxidation of Fe(II) by O3.

Simultaneous determination of Benzaldehyde, benzyl alcohol, acetophenone and phenethyl alcohol in petrochemical wastewater by solid-phase extraction coupled with GC/MS

Interfacial regulation of natural magnetite for oil-water separation in oily petrochemical wastewaters

Balanced water transport and evaporation by directionally wettability-gradient assembled evaporator for cascaded anti-oil and desalination.

Low ecological risks for heavy metals and total petroleum hydrocarbons on typical coastal petrochemical sewage discharge waters: Monitoring and evaluation under One Health framework.

Preparation of pseudocapacitive Na0.44MnO2 nanowire based potentiometric sensor for detection of Na+ ion in petrochemical wastewater

Exogenous substances promote aerobic granular sludge formation and pollutants removal in treating petrochemical wastewater at low concentration

Natural sunlight-driven photocatalytic mineralization of petrochemical wastewater using ceramic-supported Fe, B co-doped TiO2/CNT@WO3 in a flat panel photoreactor

Targeted stepwise pre-adsorption for enhanced nanofiltration removal of dissolved organic pollutants in petrochemical wastewater.

A novel magnetic adsorption and capacitive deionization coupled technology for industrial saline wastewater recycling.

Synergistic volatiles removal via diffusion inhibition and catalysis degradation by photothermal-photocatalytic hydrogel distillation membranes for sustainable water purification.

Pollutant degradation in saline wastewater using synthetic biology.

Photodegradation of dissolved organic matter (DOM) in aquatic environments can alter spectral fingerprints beyond microbial composition changes, which reduces traceback accuracy. Here, photodegradation effects on the fluorescence properties of DOM from typical sources were investigated using fluorescence excitation-emission matrix spectroscopy (EEMs), i.e., sheep excrement (EXC), urban sewage (URB), petrochemical wastewater (IND), and riparian topsoil (tDOM), over a 12-day photodegradation experiment. Six components (C1-C6) were identified: C1: lignin-derived intermediates, C2: tryptophan-like, C3: fulvic-like, C4/C6: tyrosine-like, and C5: photodegradation byproducts. Interestingly, C1, C4 and C6 dominated in EXC/IND-DOM, C5 in tDOM, and C2 in URB. Based on hetero-2D correlation spectroscopy (EEMs-UV) and moving window (MW) analysis, we found that protein-like in EXC-DOM and tDOM and amine-like in IND-DOM containing phenolic, aromatic, and alcoholic-hydroxyl are photosensitive and deeply decompose in 0-4 days during the photodegradation, while protein-like in URB-DOM is continuously decomposed. Moreover, lignin-derived was rapidly decomposed in 0-2 days during the EXC-DOM, URB-DOM, and tDOM degradation. According to the structural equation model, protein-like in EXC-DOM could be deeply degraded indirectly through C5, whereas that in IND, URB and tDOM might be directly degraded. Furthermore, lignin-derived might be directly decomposed in EXC, tDOM, and URB. These findings not only reveal the photodegradation mechanism of DOM from different sources but also are conducive to traceability in natural and engineered water bodies.

Microplastics in petrochemical wastewater: A comprehensive review of removal mechanism, influencing factors and effects on wastewater reuse process

The remediation of surface water contaminated with diesel using the Fenton oxidative method was investigated at ambient temperature (28-34 °C) for effectiveness and optimum conditions were established using UV Spectroscopy. This study was aimed at investigating the effectiveness of Fenton oxidation in remediating diesel-contaminated water. The optimization results for the Fenton-Oxidative showed 400,000 mg/L H2O2 and 300 mg/L FeSO4, and pH adjusted between 2.50-3.00 for all samples. At the end of the chemical remediation experiment, the Fenton-oxidative method proved to be incredibly quick, with the reaction being exothermic and following second order kinetics, 88.80% (from 4297.73 mg/L to 480.57mg/L) removal efficiency of total petroleum hydrocarbon as diesel was realized after one hour under water. The reaction followed a pseudo-first order kinetics with the rate constant of 1.16 x 104 min-1 mg/L. The Fenton-oxidative method for surface water polluted with diesel gave remediation efficiency of 39.62% (Cd), 53.23% (Ni), 21.79% (Pb), 38.89% (Hg), 68.75% (Se), and 82.65% (Cr). Except for Chromium and Selenium, other heavy metal concentrations exceeded the permissible levels recommended by World Health Organization (WHO). This implies that Fenton oxidative method is ineffective in the removal of Cd, Pb, Ni, and Hg from surface water polluted with diesel. The values of the physicochemical parameters of the surface water contaminated with diesel were similar with the unpolluted surface water sample and World Health Organization (WHO) permissible limits. This implies that diesel polluted surface water remediated by Fenton-oxidative method needs post-treatment to improve on its portability for drinking/domestic and agricultural uses. Fenton oxidative technique makes use of what is readily available and cheap, thereby avoiding the use of more complex methods. In conclusion, the Fenton-oxidative method was found to be very effective in remediating surface water contaminated with diesel.

In this study a nanocomposite namely cellulose nanocrystals (CNCs) was produced under laboratory conditions from textile wastes to remove the pollutants [oil, dissolved organic carbon (DOC), dissolved suspended solids (DSS), toluene and m-xylene] present in a petrochemical industry wastewater (PCI ww). With the aim of reducing environmental pollution and promoting economic circularity, textile wastes such as fibres, yarn clippings, fabric remnants from factory cuts, and new garments has been shown to be a viable material for nanocellulose extraction, its low cost, high amount in landflls. Nanocellulose extraction from textile waste was performed in two-stage process. Firstly, a purification process for the removal of non-cellulosic components is performed for cellulose fibre isolation then alkaline treatment and bleaching stages were applied. Afterwards, nanocellulose is extracted from cellulose fibrils. SEM analysis showed that CNCs presented a homogeneous structure. FTIR assays exhibited a band at 3422 cm−1 which is attributed to the hydroxyl groups and the band at 2889 cm−1 indicates the carboxylic acids. The XRD pattern of CNCs exibited two main diffraction peaks at 2θ angles of 8° and 18.9°. TGA of the samples exhibited low degrees of carboxyl functionalization. This reduced thermal stability and the degradation temperature. The DTG data for cellulose showed highest extent of carboxyl content in the CNCs samples. The effects of some operational conditions such as increasing of photoremoval time, increasing pH values, increasing pollutant concentrations (oil, DOC, DSS, toluene and m-xylene) and increasing CNCs nanocomposite concentrations on the maximum yields of PCI ww pollutants were investigated. Maximum 99.30% oil, 99.10% DOC, 99.52% DSS, 95.64% toluene, and 99.05% m-xylene removal efficiencies were observed at 100 mg/l CNC nanocomposites concentration, in PCI ww, after 150 min photoremoval time, at pH=7.0, at 1000 mg/l pollutant concentrations, and at 25oC, respectively. Nanocellulose obtained from textile wastes is seen as a sufficient and promising alternative to synthetic polymers, with the advantage of being obtained from renewable and cheap resources and also being used in the production of adequate nanocomposites.