Showing papers on "Wastewater published in 2023"

Highly efficient adsorption and removal bio-staining dye from industrial wastewater onto mesoporous Ag-MOFs

Abstract: Adsorption is an effective and promising approach for removing pollutants from wastewater. Too many hazardous colors were unintentionally released into the water, which had a negative impact on the environment. A popular textile dye is malachite green (MG). Thus, in this work, an environmentally acceptable inorganic-organic Ag metal-organic framework-based technique to remove colors from industrial water was developed (Ag-MOF). The sorbent was analyzed in the first section of the work using SEM, XPS, XRD, FT-IR, pHpzc, and BET, which confirmed that the Ag-MOF had the BET surface area, is 676 m2/g, which is a significant surface area. In a later stage, the sorption properties of the dye were examined along with the effects of pH, sorbent dosage, temperature, and ionic strength; the sorption isotherms and uptake kinetics were examined: As opposed to the kinetic profile, Isotherm profiles are well-fit by the Langmuir equation and can be modeled by the pseudo-second order rate equation. The outcomes further demonstrated that MG was mostly adsorbed onto Ag-MOF adsorbent by electrostatic attraction forces, hydrogen bonding, ion exchange, and pore filling. 2.25 mmol/g was found to be the greatest adsorption effectiveness of MG onto Ag-MOF adsorbent. (i.e. 809.71 mg/g). Adsorbent dosage, solution pH, temperature, and time were the four adsorption process parameters that were tuned using Box-Behnken design (BBD) in response surface methodology (RSM). The (ΔH°), (ΔS°), and (ΔG°) MG dye was endothermically and spontaneously extracted using Ag-MOF as an adsorbent, according to the specifications. Up to five cycles of adsorption-desorption, the synthesised Ag-MOF adsorbent demonstrates exceptional render ability and cyclability. The produced adsorbent's efficacy for purifying wastewater samples at a laboratory scale was assessed as a proof of concept. Study the mechanism of interaction between the Ag-MOF and MG as it could be take place through π-π interaction, pore filling, H-Bonding or electrostatic interaction. The mesoporous Ag-MOF adsorbent offered a simple and effective way to handle water filtering and industrial wastewater management. According to our research, this work is the first to explain how to remove MG dye from wastewater samples using Ag-MOF adsorbents.

The Effect of Mineral Ions Present in Tap Water on Photodegradation of Organic Pollutants: Future Perspectives

Abstract: Photodegradation is the chemical conversion of large, toxic, and complex molecules into non-toxic, simpler, and lower molecular weight species due to light exposure. Heterogeneous photocatalysis has sufficient potential to degrade toxic organic pollutants present in wastewater. As industries discharge their effluents containing organic pollutants into natural water bodies, which penetrate into the subsurface through connected pores it is necessary to study this process in natural or tap water. Tap water (TW) is mainly obtained from underground wells having inorganic salts in a minute quantity with a conductivity of 500 μS/cm. TW contains inorganic anions, which affect the photocatalytic activity and photocatalysis process. The aim of this review is to evaluate the effect of TW on the photo-degradation of organic pollutants such as dyes, pharmaceutical products, pesticides, etc., with the support of the literature. The TW had a diverse effect on the photodegradation of organic pollutants; either it may enhance or decrease the rate of pollutants’ photodegradation.

Removal of oil from wastewater by advanced oxidation process / homogeneous process

Abstract: In the present work advanced oxidation process, photo-Fenton (UV/H2O2/Fe+2) system, for the treatment of wastewater contaminated with oil was investigated. The reaction was influenced by the input concentration of hydrogen peroxide H2O2, the initial amount of the iron catalyst Fe+2, pH, temperature and the concentration of oil in the wastewater. The removal efficiency for the system UV/ H2O2/Fe+2 at the optimal conditions and dosage (H2O2 = 400mg/L, Fe+2 = 40mg/L, pH=3, temperature =30o C) for 1000mg/L load was found to be 72%.

Show us the data: global COVID-19 wastewater monitoring efforts, equity, and gaps

Abstract: A year since the declaration of the global coronavirus disease 2019 (COVID-19) pandemic, there were over 110 million cases and 2.5 million deaths. Learning from methods to track community spread of other viruses such as poliovirus, environmental virologists and those in the wastewater-based epidemiology (WBE) field quickly adapted their existing methods to detect SARS-CoV-2 RNA in wastewater. Unlike COVID-19 case and mortality data, there was not a global dashboard to track wastewater monitoring of SARS-CoV-2 RNA worldwide. This study provides a 1-year review of the "COVIDPoops19" global dashboard of universities, sites, and countries monitoring SARS-CoV-2 RNA in wastewater. Methods to assemble the dashboard combined standard literature review, Google Form submissions, and daily, social media keyword searches. Over 200 universities, 1400 sites, and 55 countries with 59 dashboards monitored wastewater for SARS-CoV-2 RNA. However, monitoring was primarily in high-income countries (65%) with less access to this valuable tool in low- and middle-income countries (35%). Data were not widely shared publicly or accessible to researchers to further inform public health actions, perform meta-analysis, better coordinate, and determine equitable distribution of monitoring sites. For WBE to be used to its full potential during COVID-19 and beyond, show us the data.

Wastewater surveillance for public health

Abstract: Description Wastewater contains information on pathogen spread, evolution, and outbreak risk Dating back to the origins of modern epidemiology, wastewater surveillance has predominantly been used to track pathogens spread by fecal-oral transmission such as those that cause cholera and polio. However, more than just these “enteric” pathogens are shed via the gut, as highlighted by the success of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) wastewater surveillance (1, 2), recent work on tracking influenza virus (3) and monkeypox virus (4), and observations of extensive pathogen diversity in stool (5, 6). Wastewater is now a core component of infectious disease monitoring, providing a variant-specific, community-representative picture of public health trends that captures previously undetected spread and pathogen transmission links. Building on recent laboratory and analytical advances to identify the diverse pathogens present in sewage will be essential to ongoing efforts to understand disease risks and will transform infectious disease surveillance.

Adsorptive decontamination of antibiotics from livestock wastewater by using alkaline-modified biochar.

Abstract: Efficient abatement of antibiotics from livestock wastewater is in urgent demand, but still challenging. In this study, alkaline-modified biochar with larger surface area (130.520 m2 g-1) and pore volume (0.128 cm3 g-1) was fabricated and explored for the adsorption of different types of antibiotics from livestock wastewater. Batch adsorption experiments demonstrated that the adsorption process was mainly determined by chemisorption and was heterogeneous, which could be moderately affected by the variations of solution pH (3-10). Furthermore, the computational analysis based on density functional theory (DFT) indicated that the -OH groups on biochar surface could serve as the dominant active sites for antibiotics adsorption due to the strongest adsorption energies between antibiotics and -OH groups. In addition, the antibiotics removal was also evaluated in multi-pollutants system, where biochar performed synergistic adsorption towards Zn2+/Cu2+ and antibiotics. Overall, these findings not only deepen our understandings on the adsorption mechanism between biochar and antibiotics, but also promote the application of biochar in the remediation of livestock wastewater.

Efficient hydrogen production from wastewater remediation by piezoelectricity coupling advanced oxidation processes.

Abstract: Efficient H2 harvesting from wastewater instead of pure water can minimize fresh water consumption, which is expected to solve the problem of water shortage in H2 production process and contribute to carbon neutrality in the environmental remediation, but the inevitable electron depletion caused by electron-consuming pollutants will result in an exhausted H2 evolution reaction (HER) performance. In this paper, by coupling piezocatalysis and advanced oxidation processes (AOPs) by a MoS2/Fe0/peroxymonosulfate (PMS) ternary system, extensive types of wastewater achieved considerable H2 generation, which exceeded the yield in pure water with synchronous advanced degradation of organic pollutants. In addition, profiting from the crucial bridging role of PMS, the H2 yield in nitrobenzene wastewater after the introduction of PMS-based AOPs increased 3.37-fold from 267.7 μmol·g-1·h-1 to 901.0 μmol·g-1·h-1 because the presence of PMS both thermodynamically benefited MoS2 piezocatalytic H2 evolution and eliminated the electron depletion caused by organic pollutants. By this way, the original repressed H2 evolution performance in substrate of wastewater not only was regained but even showed a significant enhancement than that in pure water (505.7 μmol·g-1·h-1). Additionally, the cyclonic piezoelectric reactor was preliminarily designed for future industrialization. This strategy provided a valuable path for the recycling of actual wastewater by fuel production and synchronous advanced treatment.

Prospects of metal recovery from wastewater and brine

Abstract: Modern technology relies on an undisrupted supply of metals, yet many metals have limited geological deposits. Recovering metals from wastewater and brine could augment metal stocks, but there is little guidance on which metals to prioritize for recovery or on the techno-economic viability of extraction processes. Here we critically assess the potential for recovering metals from wastewater and brine. We first look at which metals are critical for recovery on the basis of their supply risks and the impacts of those supply restrictions. We then assess the feasibility of recovering these metals from various water sources by estimating the required operational costs to match market prices. Next we discuss the limitations of established separation technologies that may inhibit the practicality and scalability of metal recovery from water. We conclude by highlighting materials and processes that could serve as more sustainable alternatives to metal recovery with further research and development. Recovering metals from wastewater and brine could augment metal stocks that are fundamental to modern technology. This Perspective assesses the potential of, and provides guidance for, recovering metals from wastewater and brine.

Detection of Monkeypox Virus DNA in Airport Wastewater, Rome, Italy

Abstract: Environmental surveillance can be a complementary tool for detecting pathogens circulating in communities. We detected monkeypox virus DNA in wastewater from Italy’s largest airport by using real-time PCR assays targeting the G2R region and F3L and N3R genes and sequencing. Wastewater surveillance can be quickly adapted to investigate emerging threats.

Performance Evaluation Of Dye Wastewater Treatment Technologies: A Review

Abstract: Dye wastewater released from several dyes induced industries are harmful towards the living, non-living environment and human. Consequently, existence of dye in water bodies is becoming a rising concern to environmentalists and citizens. Dye wastewater should be treated prior to release in an open water body to minimize its negative impacts. A long term sustainable and efficient treatment methods should be established to reduce and overcome the impacts. Although there have been significant advances in the management and treatment of such effluent using physical, chemical and biological methods. However, due to lack of information on effective dye removal methods, it is difficult to decide on a single unique technique that resolves the prevailing dye wastewater. Therefore, this paper reviews recent research on various (physical, chemical, biological, advanced oxidation process (AOPs) and hybrid) dye removal methods to compare efficiency, evaluation performance, merits and demerits. Among the existing methods, most of them have a common disadvantage which is the generation of secondary pollutes, takes long time and costly. This paper especially highlights AOPs method for dye removal as these are known as one of the promising and most effective dye removal techniques these days. This paper also suggests the application of AOPs methods possess the best performance in terms of faster dye removing as well as cost effective, time oriented and environmentally friendly. Additionally, this paper addressed the difficulties and future prospects of this emerging method that links to sustainable development.