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https://www.readbyqxmd.com/read/30326356/bisulfite-triggers-fast-oxidation-of-organic-pollutants-by-colloidal-mno-2
#1
Bo Sun, Zhongjin Xiao, Hongyu Dong, Shangchen Ma, Guangfeng Wei, Tongcheng Cao, Xiaohong Guan
Colloidal MnO2 is the most reactive phase of Mn(IV) while HSO3 - is a common reductant in water treatment. This study shows that the presence of HSO3 - resulted in significant increase in the decomposition rate of organic contaminants by colloidal MnO2 . The degradation rate of contaminants in the MnO2 /HSO3 - process dropped with elevating pH and a proper MnO2 /HSO3 - molar ratio was critical for efficient decomposition of contaminants. The time-resolved spectroscopy of manganese species, the influence of pyrophosphate on UV absorbance spectra, and the relative rate constants of contaminants oxidation in MnO2 /HSO3 - process suggested that the synergetic effect of HSO3 - and colloidal MnO2 arose from the generation of Mn(III)aq , which could oxidize contaminants rapidly...
October 2, 2018: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/30326334/comprehensive-performance-evaluation-of-lid-practices-for-the-sponge-city-construction-a-case-study-in-guangxi-china
#2
Qian Li, Feng Wang, Yang Yu, Zhengce Huang, Mantao Li, Yuntao Guan
Sponge city construction is a new concept of urban stormwater management, which can effectively relieve urban flooding, reduce non-point source pollution, and promote the usage of rainwater resources, often including the application of Low Impact Development (LID) techniques. Although 30 cities in China have been chosen to implement sponge city construction, there is a lack of a quantitative evaluation method to evaluate the environmental, economic, and social benefits of LID practices. This paper develops a comprehensive evaluation system to quantify the benefits of different combinations of LID units using the Storm Water Management Model (SWMM) and the Analytical Hierarchy Process (AHP) method...
October 13, 2018: Journal of Environmental Management
https://www.readbyqxmd.com/read/30325169/effects-of-vegetative-filter-strip-on-overland-flow-nitrogen-and-phosphorus-intercepting-under-different-inflow-conditions
#3
Dong Li She, Limu Bulaiti A, Qian Chen, Xiao Han
The vegetative filter strips can effectively intercept erosion of water and sediment on the slope, with huge potential to prevent and control soil erosion and agricultural non-point source pollution. A series of muddy water scouring experiments under different inflow conditions in the indoor soil trays were conducted to investigate the effects of vegetative filter strip (VFS) on intercepting nitrogen (N) and phosphorus (P) under different inflow conditions and its internal hydrological responses. The results showed that the VFS could effectively intercept N and P in the runoff...
October 2018: Ying Yong Sheng Tai Xue Bao, the Journal of Applied Ecology
https://www.readbyqxmd.com/read/30325168/p-absorption-and-removal-mechanism-of-new-salix-clone-a42-on-eutrophic-water-with-different-p-concentrations
#4
Ze Yu Cai, Jian Feng Zhang, Guang Cai Chen, Han Dan Zhang, Shi Yong Sun, Xiao Gang Li, Guang Hua Qin
Phosphorus is the necessary element for plant growth, and its concentration is one of the main indices for water eutrophication. Hence, it is significant to understand how woody plants purify phosphorus in eutrophic water. The purpose of this study is to reveal the P absorption and removal mechanism of Salix matsudana in eutrophic water with different P concentration. We selected new S. matsudana clone (A42) as experimental material and set three levels of P concentration (low P: 0.1, 0.2 mg·L-1 ; medium P: 1...
October 2018: Ying Yong Sheng Tai Xue Bao, the Journal of Applied Ecology
https://www.readbyqxmd.com/read/30325092/intensive-allochthonous-inputs-along-the-ganges-river-and-their-effect-on-microbial-community-composition-and-dynamics
#5
Si-Yu Zhang, Despina Tsementzi, Janet K Hatt, Aaron Bivins, Nikunj Khelurkar, Joe Brown, Sachchida Nand Tripathi, Konstantinos T Konstantinidis
Little is known about microbial communities in the Ganges River, India and how they respond to intensive anthropogenic inputs. Here we applied shotgun metagenomics sequencing to study microbial community dynamics and function in planktonic samples collected along a ~700 km river transect, including urban cities and rural settings in upstream waters, before and after the monsoon rainy season. Our results showed that 11-32% of the microbes represented terrestrial, sewage and human inputs (allochthonous). Sewage inputs significantly contributed to the higher abundance, by 13-fold of human gut microbiome (HG) associated sequences and 2-fold of antibiotic resistance genes (ARGs) in the Ganges relative to other riverine ecosystems in Europe, North and South America...
October 16, 2018: Environmental Microbiology
https://www.readbyqxmd.com/read/30324379/total-coliform-inactivation-in-natural-water-by-uv-h-2-o-2-uv-us-and-uv-us-h-2-o-2-systems
#6
Ainhoa Rubio-Clemente, Edwin Chica, Gustavo Peñuela
The presence of pathogens in drinking water can seriously affect human health. Therefore, water disinfection is needed, but conventional processes, such as chlorination, result in the production of dangerous disinfection by-products. In this regard, an alternative solution to tackle the problem of bacterial pollution may be the application of advanced oxidation processes. In this work, the inactivation of total coliforms, naturally present in a Colombian surface water by means of UV/H2 O2 , UV/US, and the UV/US/H2 O2 advanced oxidation processes, was investigated...
October 16, 2018: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/30321843/phytoextraction-of-cd-from-a-contaminated-soil-by-tobacco-and-safe-use-of-its-metal-enriched-biomass
#7
Yang Yang, Yichen Ge, Pengfei Tu, Hongyuan Zeng, Xihong Zhou, Dongsheng Zou, Kelin Wang, Qingru Zeng
Successful phytoextraction produces a large quantity of contaminated biomass, which will cause secondary pollution unless properly treated. This study investigated the disposal of contaminated tobacco biomass after phytoextraction. We detected significantly high Cadmium concentrations in tobacco, especially in their stems and leaves. From the latter, nearly all the Cd and nicotine were removed by extractions with 0.5% HCl + 70% ethanol, and the nicotine completely recovered via steam distillation, whereas the protein content remained unaffected in the leaves, thus making them safe for use as animal feed...
October 6, 2018: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/30321825/co-transport-of-u-vi-and-akagan%C3%A3-ite-colloids-in-water-saturated-porous-media-role-of-u-vi-concentration-ph-and-ionic-strength
#8
Mengtuan Ge, Dengjun Wang, Junwei Yang, Qiang Jin, Zongyuan Chen, Wangsuo Wu, Zhijun Guo
Remediating uranium contamination becomes a worldwide interest because of increasing uranium release from mining activities. Due to ubiquitous presence of pyrite and the application of iron-based technology, colloidal iron oxy-hydroxides such as akaganéite colloid (AKC) extensively exist in uranium polluted water at uranium tailing sites. In this context, we studied individual and co-transport of U(VI) and AKC in water-saturated sand columns at 50 mg/L AKC and environmentally relevant U(VI) concentrations (5...
October 5, 2018: Water Research
https://www.readbyqxmd.com/read/30321737/adsorptive-decontamination-of-diclofenac-by-three-dimensional-graphene-based-adsorbent-response-surface-methodology-adsorption-equilibrium-kinetic-and-thermodynamic-studies
#9
Billie Yan Zhang Hiew, Lai Yee Lee, Kar Chiew Lai, Suyin Gan, Suchithra Thangalazhy-Gopakumar, Guan-Ting Pan, Thomas Chung-Kuang Yang
Pharmaceutical residues are emerging pollutants in the aquatic environment and their removal by conventional wastewater treatment methods has proven to be ineffective. This research aimed to develop a three-dimensional reduced graphene oxide aerogel (rGOA) for the removal of diclofenac in aqueous solution. The preparation of rGOA involved facile self-assembly of graphene oxide under a reductive environment of L-ascorbic acid. Characterisation of rGOA was performed by Fourier transform infrared, scanning electron microscope, transmission electron microscopy, nitrogen adsorption-desorption, Raman spectroscopy and X-ray diffraction...
September 26, 2018: Environmental Research
https://www.readbyqxmd.com/read/30321713/the-pollution-level-of-the-bla-oxa-58-carbapenemase-gene-in-coastal-water-and-its-host-bacteria-characteristics
#10
Rui Xin, Kai Zhang, Nan Wu, Ying Zhang, Zhiguang Niu
This paper investigated 10 carbapenemase genes and selected the hosts of these genes in the estuary of Bohai Bay. The results showed that the OXA-58 producer accounted for a large percentage of carbapenem resistant bacteria in the sampling points, whereas the VIM, KPC, NDM, IMP, GES, OXA-23, OXA-24, OXA-48 and OXA-51 producers were not detected in the study. In addition, 9 bacterial genera with 100% identical blaOXA-58 sequences, including Pseudomonas, Rheinheimera, Stenotrophomonas, Shewanella, Raoultella, Vibrio, Pseudoalteromonas, Algoriphagus, Bowmanella and Thalassospira, were isolated from seawater...
October 6, 2018: Environmental Pollution
https://www.readbyqxmd.com/read/30321711/importance-of-denitrification-driven-by-the-relative-abundances-of-microbial-communities-in-coastal-wetlands
#11
Yan Zhang, Guodong Ji, Chen Wang, Xuanrui Zhang, Ming Xu
Excessive nitrogen (N) loadings from human activities have led to increased eutrophication and associated water quality impacts in China's coastal wetlands. Denitrification accounts for significant reduction of inorganic N to nitrous oxide (N2 O) or dinitrogen gas (N2 ), and thereby curtails harmful effects of N pollution in coastal and marine ecosystems. However, the molecular drivers and limiting steps of denitrification in coastal wetlands are not well understood. Here, we quantified the abundances of functional genes involved in N cycling and determined denitrification rates using 15 N paring technique in the coastal wetland sediments of Bohai Economic Rim in eastern China...
October 9, 2018: Environmental Pollution
https://www.readbyqxmd.com/read/30321709/coexistence-and-association-between-heavy-metals-tetracycline-and-corresponding-resistance-genes-in-vermicomposts-originating-from-different-substrates
#12
Kuan Liu, Mingming Sun, Mao Ye, Huizhen Chao, Yuanchao Zhao, Bing Xia, Wentao Jiao, Yanfang Feng, Xiaoxuan Zheng, Manqiang Liu, Jiaguo Jiao, Feng Hu
Coexistence of antibiotics/heavy metals and the overexpression of resistance genes in the vermicompost has become an emerging environmental issue. Little is known about the interaction and correlation between chemical pollutants and biological macromolecular compounds. In this study, three typical vermicompost samples were selected from the Yangtze River Delta region in China to investigate the antibiotic, heavy metal and corresponding antibiotic resistance genes (ARGs) and heavy metal resistance genes (HRGs)...
October 6, 2018: Environmental Pollution
https://www.readbyqxmd.com/read/30320064/thermally-driven-selective-nanocomposite-ps-phb-mgc-nanofibrous-conductive-sensor-for-air-pollutant-detection
#13
Joshua Avossa, Emiliano Zampetti, Fabrizio De Cesare, Andrea Bearzotti, Giuseppe Scarascia-Mugnozza, Giuseppe Vitiello, Eyal Zussman, Antonella Macagnano
The potentials to use the working temperature to tune both the sensitivity and the selectivity of a chemical sensor based on a nanostructured and nanocomposite polymer layer have been investigated and described. Thus, in a single step, a peculiar chemical layer was grown up onto IDE (Interdigitated Electrode) microtransducers by electrospinning deposition and using a single-needle strategy. The 3-component nanofibers, obtained from a mixture of polystyrene and polyhydroxibutyrate (insulating thermoplastics) and a known concentration of mesoporous graphitized carbon nanopowder, appeared highly rough on the surface and decorated with jagged islands but homogeneous in shape and diameter, with the nanofillers aggregated into clusters more or less densely packed through the fibers...
2018: Frontiers in Chemistry
https://www.readbyqxmd.com/read/30319053/dissolution-of-cellulose-in-ionic-liquid-and-water-mixtures-as-revealed-by-molecular-dynamics-simulations
#14
Bharat Manna, Amit Ghosh
Increasing population growth and industrialization are continuously oppressing the existing energy resources, elevating the pollution and global fuel demand. Various alternate energy resources can be utilized to cope with these problems in an environment-friendly fashion. Currently, bioethanol (sugarcane, corn-derived) is one of the most widely consumed biofuels in the world. Lignocellulosic biomass is yet another attractive resource for sustainable bioethanol production. Pretreatment step plays a crucial role in the lignocellulose to bioethanol conversion by enhancing cellulose susceptibility to enzymatic hydrolysis...
October 15, 2018: Journal of Biomolecular Structure & Dynamics
https://www.readbyqxmd.com/read/30318641/visible-and-nir-light-responsive-black-phosphorus-based-nanostructures-in-solar-fuel-production-and-environmental-remediation
#15
Rongjuan Feng, Wanying Lei, Gang Liu, Minghua Liu
Direct utilization of the full spectrum of renewable solar light, in particular the visible- and near-infrared (NIR) portions, is currently receiving a great deal of attention in solar-to-chemical energy conversion-a clean, economically, and environmentally sustainable process. Black phosphorus (BP), a newly emerging class of ultrathin 2D nanomaterials rediscovered in early 2014, fulfills this purpose due to its unique properties like high charge-carrier mobility and tunable direct-bandgap. To this end, the rational combinations of BP in the form of few-layer nanosheets or ultrasmall quantum dots with a range of organic and inorganic nanomaterials offer more versatile and robust hybrids and nanocomposites that are functional in solar fuel production and environmental remediation...
October 15, 2018: Advanced Materials
https://www.readbyqxmd.com/read/30318156/electrochemical-dewatering-for-the-removal-of-hazardous-species-from-sludge
#16
F L Silva, M R V Lanza, C Saez, M A Rodrigo
This work focuses on the evaluation of the electrochemical dewatering of sludge polluted with model hazardous species. To do this, two sludge samples taken from the outlet of the anaerobic digesters of the municipal Wastewater Treatment Facility of Ciudad Real were polluted with herbicide clopyralid (CP) and with antibiotics amoxicillin (AMX) and ampicillin (AMP), respectively. These sludge samples underwent first dewatering by press filtration and then, the dewatering continued by the application of an electrochemically assisted driven process with increasing electric fields (1...
October 11, 2018: Journal of Environmental Management
https://www.readbyqxmd.com/read/30318116/nrf2-deficiency-exacerbates-pm-2-5-induced-olfactory-bulb-injury
#17
Xiaoyu Chen, Shan Liu, Wei Zhang, Chunyan Wu, Hanchen Liu, Fang Zhang, Zhongbing Lu, Wenjun Ding
Recent studies have demonstrated that long-term exposure to fine particulate matter (PM2.5 ) increases the risk of central nervous (CNS) diseases. As a basic region-leucine zipper (bZip) transcription factor, nuclear factor erythroid 2-related factor 2 (Nrf2) is essential for protection against chemically induced oxidative stress to restore cellular redox balance. However, the impact of Nrf2 on the neurotoxic effects of PM2.5 remains to understand. In this study, we exposed wild-type (WT) and Nrf2 knockout (Nrf2-/- ) mice to 1 mg/kg PM2...
October 11, 2018: Biochemical and Biophysical Research Communications
https://www.readbyqxmd.com/read/30317180/spatio-temporal-dynamics-drivers-and-potential-sources-of-heavy-metal-pollution-in-riparian-soils-along-a-600-kilometre-stream-gradient-in-central-china
#18
Chen Ye, Orpheus M Butler, Ming Du, Wenzhi Liu, Quanfa Zhang
Riparian ecosystems are particularly prone to heavy metal (HM) contamination, acting as a sink for HMs coming from human activities upstream or on adjacent uplands. An advanced understanding of the spatio-temporal dynamics, environmental drivers and the likely sources of HM contamination in riparian soils will be necessary for the conservation of riparian ecosystems. Thus, we conducted a nine-year study across a 600 km stream gradient along the Yangtze river, which has come under immense pressure in recent years partly due to the establishment of the Three Gorges Dam (TGD), the largest hydropower dam in the world...
October 9, 2018: Science of the Total Environment
https://www.readbyqxmd.com/read/30317118/toxicity-of-some-prevalent-organic-chemicals-to-tadpoles-and-comparison-with-toxicity-to-fish-based-on-mode-of-toxic-action
#19
Shuo Wang, Li C Yan, Shan S Zheng, Tian T Li, Ling Y Fan, Tao Huang, Chao Li, Yuan H Zhao
Although mode of action (MOA) plays a key role in the understanding of the toxic mechanism of chemicals, the MOAs of class-based compounds to tadpoles have not been investigated. To explore the MOAs, acute toxicity (expressed as log 1/LC50 ) to Rana chensinensis tadpoles were determined and molecular descriptors were calculated. Quantitative structure-activity relationship (QSAR) showed that toxicity to tadpoles is closely related to the chemical octanol/water partition coefficient (log KOW ), energy of the lowest unoccupied molecular orbital (ELUMO ), and number of hydrogen bond donors and acceptors (NHDA ), representing the bio-uptake potential in tadpoles, the electrophilicity and hydrogen bonding capacity with target site(s), respectively...
October 11, 2018: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/30317090/effective-degradation-of-refractory-nitrobenzene-in-water-by-the-natural-4-hydroxycoumarin-under-solar-illumination
#20
Tuo Wei, Muhammad Waqas, Ke Xiao, Bo Yang, Yu Luo, Qiuhan Luo, Junmin Zhang, Mingliang Wang, Caizhen Zhu, Tingchao He, Zhouguang Lu
In this study, nitrobenzene (NB) as typical refractory organic pollutants was effectively degraded by a new green approach, which was achieved by the chemical effect of natural organic matters (NOMs) under solar illumination as a potential natural degradation process. 4-hydroxycoumarin (4HC), which is natural compound and can be extracted from many plants, was found as an efficient photosensitizer to promote the photoreduction of NB to 4-aminophenol under the solar illumination. The reaction products were definitely identified by LC-MS/MS and 1 H NMR...
October 8, 2018: Chemosphere
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