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(searched for: doi:10.1016/j.scitotenv.2017.09.278)
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Miguel Martínez-Quintela, Sabela Balboa, José R. Coves, Francisco Omil, Sonia Suárez
Published: 1 January 2023
Journal of Hazardous Materials, Volume 442; https://doi.org/10.1016/j.jhazmat.2022.129983

Published: 2 December 2022
by MDPI
Journal: Molecules
Abstract:
Restricted economic conditions and limited sewage treatment facilities in rural areas lead to the discharge of small-scale breeding wastewater containing higher values of residual beta-lactam antibiotics (β-lactams), which seriously threatens the aquatic environment. In this paper, molecular docking and a comprehensive method were performed to quantify and fit the source modification for the combined biodegradation of β-lactams. Using penicillin (PNC) as the target molecule, combined with contour maps for substitute modification, a three-dimensional quantitative structure–activity relationship (3D-QSAR) model was constructed for the high-performance combined biodegradation of β-lactams. The selected candidate with better environmental friendliness, functionality, and high performance was screened. By using the homology modeling algorithms, the mutant penicillin-binding proteins (PBPs) of Escherichia coli were constructed to have antibacterial resistance against β-lactams. The molecular docking was applied to obtain the target substitute by analyzing the degree of antibacterial resistance of β-lactam substitute. The combined biodegradation of β-lactams and substitute in the constructed wetland (CW) by different wetland plant root secretions was studied using molecular dynamics simulations. The result showed a 49.28% higher biodegradation of the substitutes than PNC when the combined wetland plant species of Eichhornia crassipes, Phragmites australis, and Canna indica L. were employed.
Jianxiong Jian, Xiaojian Liao, Shoupeng Li, Shaojin Chen, Zhenhua Huang, Junhao Chen, Xingfan Zhou, Yumin Zhang, Baixuan Yin, Shuiyu Sun, et al.
Published: 1 October 2022
Journal of Water Process Engineering, Volume 49; https://doi.org/10.1016/j.jwpe.2022.103092

Akashdeep Singh Oberoi, K.C. Surendra, Di Wu, Hui Lu, Jonathan W.C. Wong, Samir Kumar Khanal
Published: 1 October 2022
Bioresource Technology, Volume 361; https://doi.org/10.1016/j.biortech.2022.127667

Marina Gutiérrez, Andrea Ghirardini, Michela Borghesi, Stefano Bonnini, Dragana Mutavdžić Pavlović, Paola Verlicchi
Published: 1 September 2022
Science of the Total Environment, Volume 840; https://doi.org/10.1016/j.scitotenv.2022.156557

Published: 30 August 2022
Journal: Msystems
Abstract:
Sewer infrastructure is a relatively new habitat comprised of thousands of kilometers of pipes beneath cities. These wastewater conveyance systems contain large reservoirs of microbial biomass with a wide range of metabolic potential and are significant reservoirs of antibiotic resistant organisms; however, we lack an adequate understanding of the ecology or activity of these communities beyond wastewater treatment plants.
Inci Karakaş, Yasemin Kaya, Ilda Vergili, Zeren Beril Özçelep, Gülsüm Yilmaz
Mühendislik Bilimleri Ve Tasarım Dergisi, Volume 10, pp 722-739; https://doi.org/10.21923/jesd.918509

Abstract:
Mikrokirleticiler, biyolojik olarak parçalanabilirliklerinin düşük olması sebebiyle ekosistemde birikme eğilimi göstermekte ve canlı hayatı için toksik, kanserojenik ve mutajenik etkileriyle büyük bir risk oluşturmaktadır. Yaygın olarak içme suları, yüzeysel sular ve yeraltı sularında da nanogram seviyesinde tespit edilen mikrokirleticiler; hastane atıksularında çok yüksek konsantrasyonlarda bulunabilmektedir. Ülkemizde hastane atıksuları doğrudan kanalizasyon sistemine verilerek, evsel atıksularla beraber ön arıtma yapılarak veya biyolojik atıksu arıtma tesisinde arıtıldıktan sonra alıcı ortama verilmektedir. Klasik atıksu arıtma yöntemleriyle atıksulardan giderilemeyen mikrokirleticilerin, ancak ileri atıksu arıtma yöntemleriyle giderimi mümkün olabilmektedir. Bu çalışmada, hastane atıksularındaki mikrokirleticilerin membran biyoreaktörde (MBR) giderimi ve işletme parametrelerinin giderim verimleri üzerine etkisi incelenmiştir.
Jun Yan, Xuebin Hu, Mengli Chen, Junmao Zhang, Fucheng Guo, Jan Vymazal,
Published: 9 March 2022
Ecological Engineering, Volume 178; https://doi.org/10.1016/j.ecoleng.2022.106596

The publisher has not yet granted permission to display this abstract.
Xinyi Zhang, Yingjie Gao, Yunhe Li, Yuerong Zhou, , Jiangwei Shang,
Published: 15 February 2022
Separation and Purification Technology, Volume 288; https://doi.org/10.1016/j.seppur.2022.120664

The publisher has not yet granted permission to display this abstract.
Zhiqiang Chen, Yingcai Tang, , Hongying Hu
Published: 22 January 2022
Environmental Research, Volume 208; https://doi.org/10.1016/j.envres.2022.112737

The publisher has not yet granted permission to display this abstract.
Ana S. Mestre, Margarida Campinas, Rui M.C. Viegas, Elsa Mesquita, Ana P. Carvalho, Maria João Rosa
Published: 1 January 2022
, Christian Wurzer, Sylvia Soldatou, Christine Edwards, Linda A. Lawton, Ondřej Mašek
Published: 1 November 2021
Science of the Total Environment, Volume 796; https://doi.org/10.1016/j.scitotenv.2021.148977

Abstract:
Cost-effective, efficient, and sustainable water treatment solutions utilising existing materials and technology will make it easier for low and middle-income countries to adopt them, improving public health. The ability of biochar to mediate and support microbial degradation of contaminants, combined with its carbon-sequestration potential, has attracted attention in recent years. Biochar is a possible candidate for use in cost-effective and sustainable biological water treatment, especially in agrarian economies with easy access to abundant biomass in the form of crop residues and organic wastes. This review evaluates the scope, potential benefits (economic and environmental) and challenges of sustainable biological water treatment using 'Biologically-Enhanced Biochar' or BEB. We discuss the various processes occurring in BEB systems and demonstrate the urgent need to investigate microbial degradation mechanisms. We highlight the need to correlate biochar properties to biofilm development, which can eventually determine process efficiency. We also demonstrate the various opportunities in adopting BEB as a cheaper and more viable alternative in Low and Middle Income Countries and compare it to the current benchmark, 'Biological Activated Carbon'. We focus on the recent advances in the areas of data science, mathematical modelling and molecular biology to systematically and sustainably design BEB filters, unlike the largely empirical design approaches seen in water treatment. 'Sequential biochar systems' are introduced as specially designed end-of-life techniques to lower the environmental impact of BEB filters and examples of their integration into biological water treatment that can fulfil zero waste criteria for BEBs are given.
Amanda F. Do Amaral, Alexandre S. A. da Silva, Rodrigo Coutinho, , Marcia Marques
Published: 7 October 2021
Water, Air, & Soil Pollution, Volume 232, pp 1-14; https://doi.org/10.1007/s11270-021-05388-6

The publisher has not yet granted permission to display this abstract.
, , Dragana Mutavdžić Pavlović,
Published: 1 October 2021
Science of the Total Environment, Volume 790; https://doi.org/10.1016/j.scitotenv.2021.148050

Abstract:
This study consists of a review on the removal efficiencies of a wide spectrum of micropollutants (MPs) in biological treatment (mainly membrane bioreactor) coupled with activated carbon (AC) (AC added in the bioreactor or followed by an AC unit, acting as a post treatment). It focuses on how the presence of AC may promote the removal of MPs and the effects of dissolved organic matter (DOM) in wastewater. Removal data collected of MPs are analysed versus AC dose if powdered AC is added in the bioreactor, and as a function of the empty bed contact time in the case of a granular activated carbon (GAC) column acting as a post treatment. Moreover, the enhancement in macropollutant (organic matter, nitrogen and phosphorus compounds) removal is analysed as well as the AC mitigation effect towards membrane fouling and, finally, how sludge properties may change in the presence of AC. To sum up, it was found that AC improves the removal of most MPs, favouring their sorption on the AC surface, promoted by the presence of different functional groups and then enhancing their degradation processes. DOM is a strong competitor in sorption on the AC surface, but it may promote the transformation of GAC in a biologically activated carbon thus enhancing all the degradation processes. Finally, AC in the bioreactor increases sludge floc strength and improves its settling characteristics and sorption potential.
Yong Chen, , Ningdan Luo, Weike Shang, Shaosen Shi, Huajing Li, ,
Published: 22 September 2021
Chemical Engineering Journal, Volume 429; https://doi.org/10.1016/j.cej.2021.132577

The publisher has not yet granted permission to display this abstract.
Zainab Syed, , Aman Dongre, Anu Kumar, Kumar Sonu, Gopesh Sharma, Akhilendra Bhushan Gupta
Published: 1 August 2021
Science of the Total Environment, Volume 780; https://doi.org/10.1016/j.scitotenv.2021.146544

Abstract:
Globally estrogenic pollutants are a cause of concern in wastewaters and water bodies because of their high endocrine disrupting activity leading to extremely negative impacts on humans and other organisms even at very low environmental concentrations. Bioremediation of estrogens has been studied extensively and one technology that has emerged with its promising capabilities is Bioelectrochemical Systems (BESs). Several studies in the past have investigated BESs applications for treatment of wastewaters containing toxic recalcitrant pollutants with a primary focus on improvement of performance of these systems for their deployment in real field applications. But the information is scattered and further the improvements are difficult to achieve for standalone BESs. This review critically examines the various existing treatment technologies for the effective estrogen degradation. The major focus of this paper is on the technological advancements for scaling up of these BESs for the real field applications along with their integration with the existing and conventional wastewater treatment systems. A detailed discussion on few selected microbial species having the unusual properties of heterotrophic nitrification and extraordinary stress response ability to toxic compounds and their degradation has been highlighted. Based on the in-depth study and analysis of BESs, microbes and possible benefits of various treatment methods for estrogen removal, we have proposed a sustainable Hybrid BES-centered treatment system for this purpose as a choice for wastewater treatment. We have also identified three pipeline tasks that reflect the vital parts of the life cycle of drugs and integrated treatment unit, as a way forward to foster bioeconomy along with an approach for sustainable wastewater treatment.
, R. Al-Yaseen, A. Mydlarczyk, A. Al-Haddad
International Journal of Environmental Science and Technology, Volume 19, pp 6141-6150; https://doi.org/10.1007/s13762-021-03550-5

The publisher has not yet granted permission to display this abstract.
Lisann Hammer,
Published: 30 June 2021
Water Environment Research, Volume 93, pp 1910-1924; https://doi.org/10.1002/wer.1603

The publisher has not yet granted permission to display this abstract.
, Changwei Li, , Abd El-Fatah Abomohra, Abubakar Shitu, Amimul Ahsan, Songming Zhu,
Published: 29 June 2021
Journal of Environmental Chemical Engineering, Volume 9; https://doi.org/10.1016/j.jece.2021.105947

The publisher has not yet granted permission to display this abstract.
Gaogui Jing, Shuai Ren, Stephen Pooley, , ,
Environmental Science: Water Research & Technology, Volume 7, pp 1177-1196; https://doi.org/10.1039/d1ew00158b

Abstract:
Electrocoagulation (EC) is a promising method that has been effectively employed in the treatment of various types of industrial effluents.
Ifra Zoomi, Harbans Kaur Kehri, Ovaid Akhtar, Dheeraj Pandey, Uma Singh, Kanhaiya Lal Chaudhary, Raghvendra Pratap Narayan
Published: 21 May 2021
The publisher has not yet granted permission to display this abstract.
José Gilmar Da Silva Do Nascimento, Ester Viana Alencar Silva, André Bezerra dos Santos, Marcos Erick Rodrigues da Silva,
Published: 12 May 2021
Environmental Research, Volume 198; https://doi.org/10.1016/j.envres.2021.111313

The publisher has not yet granted permission to display this abstract.
, Rafaela Dos Santos Costa, , Marcos Antônio Dos Santos Fernandez
Published: 27 April 2021
Sustainable Chemistry and Pharmacy, Volume 21; https://doi.org/10.1016/j.scp.2021.100428

The publisher has not yet granted permission to display this abstract.
Deepak Yadav, Sukhendra Singh, Rupika Sinha
Published: 16 April 2021
The publisher has not yet granted permission to display this abstract.
M. J. Moya-Llamas, A. Trapote, D. Prats
Published: 16 March 2021
Water Science and Technology, Volume 83, pp 1920-1931; https://doi.org/10.2166/wst.2021.096

Abstract:
An Upflow Anaerobic Sludge Blanket reactor combined with a two-stage membrane bioreactor were operated for 193 days in order to evaluate the biological removal of carbamazepine (CBZ) from low-strength municipal wastewater. The system worked in three different organic load stages (0.7 ± 0.1 kg COD·m−3·d−1, 0.4 ± 0.1 kg COD·m−3·d−1 and 0.1 ± 0.0 kg COD·m−3·d−1) to assess the impact of the influent OLR on operational parameters such as anaerobic and aerobic sludge retention time (SRT), acidity, volatile fatty acids (VFAs), biomass activity or biogas production. The highest carbamazepine removals were achieved during the anaerobic stage (UASB reactor), reaching averages of 48.9%, 48.0% and 38.2% operating at high, medium and low OLR, respectively. The aerobic treatment (MBR) served as post-treatment, improving the removals, and the global UASB-MBR system reached averages of 70.0%, 59.6% and 49.8% when the influent was at medium and low OLR, respectively. The results demonstrate the potential of combined biological systems on the removal of recalcitrant pharmaceuticals.
, , N. Delgenes, A. Danel, E. Vulliet, S. Deshayes, R. Moilleron, V. Rocher,
Published: 5 March 2021
Journal: Waste Management
Waste Management, Volume 125, pp 122-131; https://doi.org/10.1016/j.wasman.2021.02.034

Abstract:
This paper analyzes the fate of 71 priority and emerging organic contaminants all along the treatment trains of sewage sludge treatment facilities in Paris including dewatering by centrifugation, thermal drying and anaerobic digestion. It aimed at proposing and applying a mass balances calculation methodology to each process and pollutant. This data validation strategy demonstrated the complexity to perform representative inlet/outlet sampling and analysis campaigns at industrial scales regarding organic compounds and to propose options to overcome this issue. Centrifugation and drying processes only implied physical mechanisms as phase separation and water elimination. Hence, correct mass balance were expected observed for organic contaminants if sampling and analysis campaigns were representative. This was the case for hydrophobic and neutral compounds. For the other more hydrophilic and charged compounds, the mass balances were scarcely correct. Thus, the conventional sampling and analytical practices used with sludge should be questioned and adapted to better take into account the high heterogeneity of sludge and the evolution of matrix effect within sludge treatment processes on micropollutant determination. For the biological anaerobic digestion process where degradations can occur and removals can be observed, the mass balances were deeply interpreted for 60 contaminants. This process contributed to the elimination above 70% of 21 detected compounds including 16 pharmaceuticals, 2 phthalates, 2 hormones and 1 perfluorinated compound. Removals of domperidone, propranolol, escitalopram, lidocaine, verapamil and cefoperazone under this condition were reported for the first time.
, Per Falås, Elena Torresi, Marinette Hagman, Michael Cimbritz, , Magnus Christensson
Published: 25 February 2021
Journal of Hazardous Materials, Volume 414; https://doi.org/10.1016/j.jhazmat.2021.125535

Abstract:
A novel process configuration was designed to increase biofilm growth in tertiary moving bed biofilm reactors (MBBRs) by providing additional substrate from primary treated wastewater in a sidestream reactor under different redox conditions in order to improve micropollutant removal in MBBRs with low substrate availability. This novel recirculating MBBR was operated on pilot scale for 13 months, and a systematic increase was seen in the biomass concentration and the micropollutant degradation rates, compared to a tertiary MBBR without additional substrate. The degradation rates per unit carrier surface area increased in the order of ten times, and for certain micropollutants, such as atenolol, metoprolol, trimethoprim and roxithromycin, the degradation rates increased 20–60 times. Aerobic conditions were critical for maintaining high micropollutant degradation rates. With innovative MBBR configurations it may be possible to improve the biological degradation of organic micropollutants in wastewater. It is suggested that degradation rates be normalized to the carrier surface area, in favor of the biomass concentration, as this reflects the diffusion limitations of oxygen, and will facilitate the comparison of different biofilm systems.
Published: 9 January 2021
by MDPI
Journal: Catalysts
Abstract:
The presence of pharmaceutical products in the water cycle may cause harmful effects such as morphological, metabolic and sex alterations in aquatic organisms and the selection/development of organisms resistant to antimicrobial agents. The compounds’ stability and persistent character hinder their elimination by conventional physico-chemical and biological treatments and thus, the development of new water purification technologies has drawn great attention from academic and industrial researchers. Recently, the electro-Fenton process has been demonstrated to be a viable alternative for the removal of these hazardous, recalcitrant compounds. This process occurs under the action of a suitable catalyst, with the majority of current scientific research focused on heterogeneous systems. A significant area of research centres working on the development of an appropriate catalyst able to overcome the operating limitations associated with the homogeneous process is concerned with the short service life and difficulty in the separation/recovery of the catalyst from polluted water. This review highlights a present trend in the use of different materials as electro-Fenton catalysts for pharmaceutical compound removal from aquatic environments. The main challenges facing these technologies revolve around the enhancement of performance, stability for long-term use, life-cycle analysis considerations and cost-effectiveness. Although treatment efficiency has improved significantly, ongoing research efforts need to deliver economic viability at a larger scale due to the high operating costs, primarily related to energy consumption.
International Journal of Environmental Research and Public Health, Volume 18; https://doi.org/10.3390/ijerph18020400

Abstract:
High-rate activated sludge (HRAS) systems are designed to shift the energy-intensive processes to energy-saving and sustainable technologies for wastewater treatment. The high food-to-microorganism (F/M) ratios and low solid retention times (SRTs) and hydraulic retention times (HRTs) applied in HRAS systems result in the maximization of organic matter diversion to the sludge which can produce large amounts of biogas during anaerobic digestion, thus moving toward energy-neutral (or positive) treatment processes. However, in addition to the energy optimization, the removal of emerging contaminants (ECs) is the new challenge in wastewater treatment. In the context of this study, the removal efficiencies and the fates of selected ECs (three endocrine disruptors (endocrine disrupting chemicals (EDCs))—nonylphenol, bisphenol A and triclosan, and four pharmaceuticals (PhACs)—ibuprofen, naproxen, diclofenac and ketoprofen) in HRAS systems have been studied. According to the results, EDCs occurred in raw wastewater and secondary sludge at higher concentrations compared to PhACs. In HRAS operating schemes, all compounds were poorly (<40%) to moderately (<60%) removed. Regarding removal mechanisms, biotransformation was found to be the dominant process for PhACs, while for EDCs sorption onto sludge is the most significant removal mechanism affecting their fates and their presence in excess sludge.
Precious N. Egbuikwem, Gregory C. Obiechefu, Faisal I. Hai, ,
Published: 1 January 2021
Environmental Technology Reviews, Volume 10, pp 77-110; https://doi.org/10.1080/21622515.2021.1881829

Abstract:
Pollution and increasing water demand, especially for agriculture, put severe stress on freshwater sources, and as a result, there is progressive deficit in the global water supply and severe water scarcity is projected in the coming decades. Discharges from domestic, industrial and agricultural activities are potential sources of water pollution, impacting human and environmental health. In the face of growing water scarcity and droughts, coupled with the increasing water demand for irrigation, integration of high water-volume and nutrient-rich industrial effluents, into the existing water management plans for agriculture, could play an important role in tackling the problem of water scarcity. However, there is a gap in knowledge about integration of industrial effluents to sewage treatments and the reuse potential of biologically treated mixed industrial and domestic wastewater in agriculture. This study, therefore, provides a critical review on biological treatment of industrial effluents, including petroleum, textile and pharmaceutical wastewater to better understand the capability of bioprocesses and conditions for efficient degradation of pollutants. The effectiveness of activated sludge-based processes, for the treatment of mixed industrial and domestic wastewater, was critically examined, and biomass acclimation plays a vital role in enhanced biodegradation performance. Finally, the reuse potential of mixed industrial and domestic wastewaters for crop irrigation was assessed by studying the reuse outcomes in different cases where industrial effluents were utilized for crop production. Management practices, such as cultivation of salt- and metal-tolerant crops, blending and dilution of industrial wastewater with freshwater and sewage, could make industrial effluents valuable for irrigation. GRAPHICAL ABSTRACT
, , Marta Carballa, Juan M. Lema
Published: 1 November 2020
Journal: Water Research
Water Research, Volume 189; https://doi.org/10.1016/j.watres.2020.116587

Abstract:
Several studies have shown that organic micropollutants (OMPs) are biotransformed cometabolically in activated sludge systems. However, the individual role of heterotrophs in the microbial consortium is still not clear, i.e., there is still a gap regarding the influence of the heterotrophic activity on the cometabolic biotransformation kinetics and yield of the OMPs. Aiming to answer these questions, experiments with increasing primary substrate concentrations were performed under aerobic heterotrophic conditions in a continuous stirred tank reactor operated at several organic loading rates (OLR) with fixed hydraulic retention time. Moreover, the individual kinetic parameters were determined in batch assays with different initial substrate concentrations using the sludges from the continuous reactor. A set of 15 OMPs displaying a variety of physicochemical properties were spiked to the feeding in the ng L1 - µg L1 range. Results reveal that the biodegradation of the primary carbon source and the biotransformation of the OMPs occur simultaneously, in clear evidence of cometabolic behavior. Moreover, we conclude that the OMPs biotransformation kinetic constant (kbiol) shows a linear dependence with the OLR of the primary substrate for most of the compounds studied, suggesting that the heterotrophic activity seriously affects the OMPs biotransformation kinetics. However, under typical activated sludge systems operating conditions (hydraulic retention times above 8 h), their biotransformation yield would not be significantly affected.
Adewumi Olufemi Oluwole, Elizabeth Oyinkansola Omotola,
Published: 22 October 2020
Journal: BMC Chemistry
BMC Chemistry, Volume 14, pp 1-29; https://doi.org/10.1186/s13065-020-00714-1

Abstract:
The presence of emerging contaminants such as pharmaceutical and personal care products in many aqueous matrices have been reported. One of such matrix is streams of wastewater, including wastewater treatment plants inflows and outflows and wastewater flow by-passing wastewater treatment plants. Their persistence arises from their resistant to breakdown, hence they may remain in the environment over long time, with a potential to cause adverse effects including endocrine disruption, gene toxicity, the imposition of sex organs, antibiotic resistance and many others in some aquatic organisms exposed to arrays of residues of pharmaceutical and personal care products. Among the treatment techniques, advanced oxidation processes have been reported to be a better technique through which these PPCPs can be degraded in the WWTPs. Heterogeneous photocatalysis using various photocatalyst immobilized on solid support such as activated carbon, graphene and carbon nanotubes in AOPs have been shown to be a viable and efficient method of PPCPs degradation. This is because, the performance of most WWTPs is limited since they were not designed to degrade toxic and recalcitrant PPCPs. This review highlight the occurrence, concentration of PPCPs in wastewater and the removal efficiency of heterogeneous photocatalysis of TiO2 immobilized on solid supports.
, Arnaud Hélias, Dominique Patureau
Published: 15 October 2020
Journal: Water Research
Water Research, Volume 188; https://doi.org/10.1016/j.watres.2020.116524

Abstract:
Micropollutants emitted by Human activities represent a potential threat to our health and aquatic environment. Thousands of active substances are used and go to WWTP through wastewaters. During water treatment, incomplete elimination occurs. Effluents released to the environment still contain part of the micropollutants present in the influents. Here, we studied the potential impacts on Human health and aquatic environment of the release of 261 organic micropollutants and 25 inorganic micropollutants at the scale of France. Data were gathered from national surveys, reports, papers and PhD works. The USEtox ® model was used to assess potential impacts. The impacts on Human health were estimated for 94 organic and 15 inorganic micropollutants and on aquatic environment for 88 organic and 19 inorganic micropollutants highlighting lack of concentration and toxicological data in literature. Some Polycyclic Aromatic Hydrocarbons and pesticides as well as As and Zn showed highest potential impacts on Human health. Some pesticides, PCB 101, βE2, Al, Fe and Cu showed highest potential impacts on aquatic environment.
Ifra Zoomi, Harbans Kaur Kehri, Ovaid Akhtar, Dheeraj Pandey, Uma Singh, Kanhaiya Lal Chaudhary, Raghvendra Pratap Narayan
Published: 15 October 2020
The publisher has not yet granted permission to display this abstract.
, Agostina Chiavola, Amrita Bains, Naresh Singhal
Published: 14 September 2020
Environmental Technology & Innovation, Volume 20; https://doi.org/10.1016/j.eti.2020.101161

The publisher has not yet granted permission to display this abstract.
, Vera Charalambous, Elena Koumaki
Published: 28 August 2020
Environmental Processes, Volume 7, pp 1065-1094; https://doi.org/10.1007/s40710-020-00459-y

The publisher has not yet granted permission to display this abstract.
Prangya R. Rout, Tian C. Zhang, Puspendu Bhunia,
Published: 26 August 2020
Science of the Total Environment, Volume 753; https://doi.org/10.1016/j.scitotenv.2020.141990

The publisher has not yet granted permission to display this abstract.
J.C. Anderson, P. Jabari, A. Parajas, E. Loeb, K.H. Luong, A. Vahedi,
Published: 1 August 2020
Journal: Chemosphere
Abstract:
Aerated lagoons, typically used by small communities, often provide limited removal of wastewater nutrients. Given increasingly stringent wastewater standards, it is imperative that effective, but economical and easy-to-operate, treatment technologies be developed. The Submerged Attached Growth Reactor (SAGR®) is a treatment process developed to perform nitrification near freezing temperatures. Previous tests on full-scale installations have shown that SAGR could consistently remove ammonia to below current Canadian standards and provide additional total suspended solids and biochemical oxygen demand removal. In this study, we evaluated removal of polar chemicals of emerging concern (CECs), including pharmaceuticals, personal care products, and pesticides, at SAGR installations in two Manitoba First Nations communities (MCN and LPFN) under cold winter conditions. Both showed some removal of diclofenac, naproxen, clarithromycin, metoprolol, and trimethoprim, likely by biotransformation. Average naproxen removal was 21% (2.53 × 103 ng L-1) in MCN and 64% (1.58 × 103 ng L-1) in LPFN. Atenolol was well-removed by SAGR, by 80% on average (range of 64%-94%). Clarithromycin, metoprolol, and trimethoprim removal was similar within and between systems, ranging from 54% to 76% (30.8-3.07 × 102 ng L-1 removed). Carbamazepine was detected in nearly all samples, but was not well-removed, consistent with other treatment studies. Overall, results showed that SAGR technology could moderately remove CECs, while providing the designed treatment performance for other parameters. This work will help to improve our understanding of wastewater treatment in small and/or remote communities with limited infrastructure and challenging cold-weather conditions.
Published: 17 July 2020
Abstract:
The intensity of emerging pollutants such as pharmaceuticals and personal care products (PPCPs) in the aquatic and terrestrial environment is a major source of concern to researchers. The current conventional methods of wastewater treatment plants are considered not efficient enough in the complete removal of the recalcitrant contaminants from water. The use of modified transition metals in visible responsive synthesis to degrade PPCPs and other pollutants (organic and inorganic) is considered as a developing green chemistry and sustainable technology. Hence, this review presents the state-of-the-art discussion on the novel photodegradation of PPCPs, and antibacterial activities of transition metal-modified magnetite materials for wastewater treatment, and suggested directions for the future. Transition metal-modified magnetite nanostructured photocatalysis is identified as one of the best candidates employed in advanced oxidation processes (AOPs) for wastewater treatment and has been found to efficiently destroy bacterial spores and effectively remove recalcitrant pollutants in water. Therefore, this article hopes to contribute scientific knowledge along with existing ones on advanced mechanisms and technology used in wastewater treatment.
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