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https://www.readbyqxmd.com/read/28103491/chemically-activated-carbon-from-lignocellulosic-wastes-for-heavy-metal-wastewater-remediation-effect-of-activation-conditions
#1
Arunima Nayak, Brij Bhushan, Vartika Gupta, P Sharma
Chemical activation is known to induce specific surface features of porosity and functionality which play a definite role in enhancing the adsorptive potential of the developed activated carbons. Different conditions of temperature, time, reagent type and impregnation ratio were applied on sawdust precursor and their effect on the physical, surface chemical features and finally on the adsorption potential of the developed activated carbons were analysed. Under activation conditions of 600°C, 1hr, 1:0.5 ratio, ZnCl2 impregnated carbon (CASD_ZnCl2) resulted in microporosity while KOH impregnation (CASD_KOH) yielded a carbon having a wider pore size distribution...
January 10, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28102340/electrolytic-ammonia-removal-and-current-efficiency-by-a-vermiculite-packed-electrochemical-reactor
#2
Liang Li, Ji Yao, Xueyou Fang, Yuanxing Huang, Yan Mu
The ammonia removal as well as the current efficiency during electrolysis was investigated by using a vermiculite-packed electrochemical reactor under continuous mode. Experimental results showed that adsorption of ammonia by vermiculite and electrolytic desorption of ammonia simultaneously existed in the reactor, leading to 89% removal of initial 30 mg N/L ammonia and current efficiency of 25% under the condition of 2.0 A, 6.0 min hydraulic retention time with 300 mg Cl/L chloride as the catalyst...
January 19, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28101901/cyto-genotoxicity-and-oxidative-stress-in-common-carp-cyprinus-carpio-exposed-to-a-mixture-of-ibuprofen-and-diclofenac
#3
Hariz Islas-Flores, Leobardo Manuel Gómez-Oliván, Marcela Galar-Martínez, Esmeralda Michelle Sánchez-Ocampo, Nely SanJuan-Reyes, Mariana Ortíz-Reynoso, Octavio Dublán-García
Thirty million people worldwide consume each day nonsteroidal anti-inflammatory drugs (NSAIDs), a heterogeneous group of pharmaceuticals used for its analgesic, antipyretic, and anti-inflammatory properties. Recent studies report high NSAID concentrations in wastewater treatment plant effluents, in surface, ground, and drinking water, and in sediments. NSAIDs are also known to induce toxicity on aquatic organisms. However, toxicity in natural ecosystems is not usually the result of exposure to a single substance but to a mixture of toxic agents, yet only a few studies have evaluated the toxicity of mixtures...
January 19, 2017: Environmental Toxicology
https://www.readbyqxmd.com/read/28101706/comparative-assessment-of-leca-and-spartina-maritima-to-remove-emerging-organic-contaminants-from-wastewater
#4
Ana Rita Ferreira, Paula Guedes, Eduardo P Mateus, Alexandra B Ribeiro, Nazaré Couto
The present work aimed to evaluate the capacity of constructed wetlands (CWs) to remove three emerging organic contaminants with different physicochemical properties: caffeine (CAF), oxybenzone (MBPh), and triclosan (TCS). The simulated CWs were set up with a matrix of light expanded clay aggregates (LECA) and planted with Spartina maritima, a salt marsh plant. Controlled experiments were carried out in microcosms using deionized water and wastewater collected at a wastewater treatment plant (WWTP), with different contaminant mass ranges, for 3, 7, and 14 days...
January 18, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28098981/comparing-ion-exchange-adsorbents-for-nitrogen-recovery-from-source-separated-urine
#5
William A Tarpeh, Kai M Udert, Kara L Nelson
Separate collection of urine, which is only 1% of wastewater volume but contains the majority of nitrogen humans excrete, can potentially reduce the costs and energy input of wastewater treatment and facilitate recovery of nitrogen for beneficial use. Ion exchange was investigated for recovery of nitrogen as ammonium from urine for use as a fertilizer or disinfectant. Cation adsorption curves for four adsorbents (clinoptilolite, biochar, Dowex 50, and Dowex Mac 3) were compared in pure salt solutions, synthetic urine, and real stored urine...
January 18, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28097050/microbial-communities-mediating-algal-detritus-turnover-under-anaerobic-conditions
#6
Jessica M Morrison, Chelsea L Murphy, Kristina Baker, Richard M Zamor, Steve J Nikolai, Shawn Wilder, Mostafa S Elshahed, Noha H Youssef
BACKGROUND: Algae encompass a wide array of photosynthetic organisms that are ubiquitously distributed in aquatic and terrestrial habitats. Algal species often bloom in aquatic ecosystems, providing a significant autochthonous carbon input to the deeper anoxic layers in stratified water bodies. In addition, various algal species have been touted as promising candidates for anaerobic biogas production from biomass. Surprisingly, in spite of its ecological and economic relevance, the microbial community involved in algal detritus turnover under anaerobic conditions remains largely unexplored...
2017: PeerJ
https://www.readbyqxmd.com/read/28095182/effect-of-intermittent-aeration-on-microbial-diversity-in-an-intermittently-aerated-ifas-reactor-treating-municipal-wastewater-a-field-study
#7
Akansha Bhatia, Nitin Kumar Singh, Timsi Bhando, Ranjana Pathania, Absar Ahmad Kazmi
In the present study, the effect of three intermittent aeration (IA) cycles on treatment performance and microbial diversity was investigated in an integrated fixed film activated sludge (IFAS) reactor treating municipal wastewater. The results showed that IA strategies were able to achieve efficient removal of organics and nitrogen ranging between 90 and 95% and 70 and 80%, respectively, however the phosphorus removal was found to be inversely proportional to the duration of aeration off time in each IA cycle...
January 17, 2017: Journal of Environmental Science and Health. Part A, Toxic/hazardous Substances & Environmental Engineering
https://www.readbyqxmd.com/read/28094507/conjugated-polyelectrolyte-based-sensitive-detection-and-removal-of-antibiotics-tetracycline-from-water
#8
Akhtar Hussain Malik, Parameswar Krishnan Iyer
A new conjugated polyelectrolyte poly[5,5'-(((2-phenyl-9H-fluorene-9,9-diyl)bis(hexane-6,1-diyl))bis(oxy))diisophthalate] sodium (PFPT) was synthesized via Palladium catalysed Suzuki cross coupling polymerization method and successfully applied for the rapid, real time and highly sensitive detection of antibiotics tetracycline (Tc) in 100% aqueous media via photo-induced electron transfer with detection limit in ppb level. Remarkably, PFPT could also be applied for the trace analysis of Tc in serum samples having recoveries well in the range 92-97% with relative standard deviations (RSD) of 1...
January 17, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28094345/bacterial-plasmid-mediated-quinolone-resistance-genes-in-aquatic-environments-in-china
#9
Lei Yan, Dan Liu, Xin-Hua Wang, Yunkun Wang, Bo Zhang, Mingyu Wang, Hai Xu
Emerging antimicrobial resistance is a major threat to human's health in the 21(st) century. Understanding and combating this issue requires a full and unbiased assessment of the current status on the prevalence of antimicrobial resistance genes and their correlation with each other and bacterial groups. In aquatic environments that are known reservoirs for antimicrobial resistance genes, we were able to reach this goal on plasmid-mediated quinolone resistance (PMQR) genes that lead to resistance to quinolones and possibly also to the co-emergence of resistance to β-lactams...
January 17, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28094048/optimization-of-the-skimmed-milk-flocculation-method-for-recovery-of-adenovirus-from-sludge
#10
Andrêssa S F Assis, Marcelo Henrique Otenio, Betânia P Drumond, Tulio M Fumian, Marize P Miagostovich, Maria Luzia da Rosa E Silva
Return of treated sludge to the environment poses concerns and has stimulated the development of studies on viral monitoring in this matrix, in order to assess its potential risks for public health. Human adenovirus (HAdV) has been identified as a putative viral marker of faecal contamination due to its stability and resistance to the sewage treatment process. The aim of this study was to optimize the organic flocculation procedure in order to establish an appropriate methodology for HAdV recovery from sewage sludge samples...
January 13, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28093622/quantification-of-chloroflexi-eikelboom-morphotype-1851-for-prediction-and-control-of-bulking-events-in-municipal-activated-sludge-plants-in-japan
#11
Tadashi Nittami, Lachlan B M Speirs, Takuya Yamada, Ichiro Suzuki, Junji Fukuda, Futoshi Kurisu, Robert J Seviour
The dominant filamentous bacteria associated with bulking incidents in Japanese activated sludge plants with nutrient removal were identified and their quantitative correlations with sludge settleability were assessed, with the aim of controlling bulking incidents by specifically suppressing bacterial growth. Fluorescence in situ hybridization (FISH) analyses using existing oligonucleotide FISH probes indicated that the presence of Eikelboom type 1851 filamentous bacteria belonging to the phylum Chloroflexi is correlated with biomass settleability in the municipal wastewater treatment plants examined...
January 17, 2017: Applied Microbiology and Biotechnology
https://www.readbyqxmd.com/read/28092936/the-effect-of-ozonation-and-biological-activated-carbon-treatment-of-wastewater-effluents-on-formation-of-n-nitrosamines-and-halogenated-disinfection-byproducts
#12
Yi-Hsueh Chuang, William A Mitch
Ozonation followed by biological activated carbon (O3/BAC) is being considered as a key component of reverse osmosis-free advanced treatment trains for potable wastewater reuse. Using a laboratory-scale O3/BAC system treating two nitrified wastewater effluents, this study characterized the effect of different ozone dosages (0-1.0 mg O3/mg dissolved organic carbon) and BAC empty bed contact times (EBCT; 15-60 minutes) on the formation after chlorination or chloramination of 35 regulated and unregulated halogenated disinfection byproducts (DBPs), 8 N-nitrosamines, and bromate...
January 17, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28092755/coagulation-flocculation-sequential-with-fenton-or-photo-fenton-processes-as-an-alternative-for-the-industrial-textile-wastewater-treatment
#13
Edison GilPavas, Izabela Dobrosz-Gómez, Miguel Ángel Gómez-García
In this study, the industrial textile wastewater was treated using a chemical-based technique (coagulation-flocculation, C-F) sequential with an advanced oxidation process (AOP: Fenton or Photo-Fenton). During the C-F, Al2(SO4)3 was used as coagulant and its optimal dose was determined using the jar test. The following operational conditions of C-F, maximizing the organic matter removal, were determined: 700 mg/L of Al2(SO4)3 at pH = 9.96. Thus, the C-F allowed to remove 98% of turbidity, 48% of Chemical Oxygen Demand (COD), and let to increase in the BOD5/COD ratio from 0...
January 13, 2017: Journal of Environmental Management
https://www.readbyqxmd.com/read/28092006/the-efficiency-of-eichhornia-crassipes-in-the-removal-of-organic-and-inorganic-pollutants-from-wastewater-a-review
#14
Saurabh Mishra, Abhijit Maiti
Water is a basic necessity of life, but due to overextraction and heavy input of nutrients from domestic and industrial sources, the contamination level of water bodies increase. In the last few decades, a potential interest has been aroused to treat wastewater by biological methodologies before discharge into the natural water bodies. Phytoremediation using water hyacinth is found to be an effective biological wastewater treatment method. Water hyacinth (Eichhornia crassipes), a notorious weed, being the most promising plant for removal of contaminants from wastewater is studied extensively in this regard...
January 16, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28091994/source-analysis-of-organic-matter-in-swine-wastewater-after-anaerobic-digestion-with-eem-parafac
#15
Zhuo Zeng, Ping Zheng, Aqiang Ding, Meng Zhang, Ghulam Abbas, Wei Li
Swine wastewater is one of the most serious pollution sources, and it has attracted a great public concern in China. Anaerobic digestion technology is extensively used in swine wastewater treatment. However, the anaerobic digestion effluents are difficult to meet the discharge standard. The results from batch experiments showed that plenty of refractory organic matter remained in the effluents after mesophilic anaerobic digestion for 30 days. The effluent total COD (tCOD) and soluble COD (sCOD) were 483 and 324 mg/L, respectively, with the sCOD/tCOD ratio of 0...
January 13, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28088720/role-of-dissolved-mn-iii-in-transformation-of-organic-contaminants-non-oxidative-versus-oxidative-mechanisms
#16
Erdan Hu, Ya Zhang, Shuyan Wu, Jun Wu, Liyuan Liang, Feng He
Mn(III) is a strong oxidant for one electron transfer, which may be important in the transformation of organic contaminants during water/wastewater treatment and biogeochemical redox processes. This study explored the reaction mechanisms of dissolved Mn(III) with organics. The role of dissolved Mn(III) either as a catalyst or an oxidant in reactions with organics was recognized. Aquo and/or hydroxo (or free) Mn(III), generated from the bisulfite activated permanganate process, facilitated efficient N-dealkylation of atrazine via a β-elimination mechanism, resulting no net redox reaction...
January 7, 2017: Water Research
https://www.readbyqxmd.com/read/28088717/removal-of-antibiotic-resistance-genes-from-wastewater-treatment-plant-effluent-by-coagulation
#17
Na Li, Guo-Ping Sheng, Yong-Ze Lu, Raymond J Zeng, Han-Qing Yu
Antibiotic resistance genes (ARGs), as emerging environmental contaminants, have become a threat to human health. Recent studies have demonstrated that the effluent from wastewater treatment plants is a significant point source of ARGs released into the environment. In this study, we investigated the effectiveness of coagulation technology in the removal of ARGs from treated wastewater. Specifically, we measured the removal of five ARGs (two sulfonamide resistance genes, sulI and sulII, and three tetracycline resistance genes, tetO, tetW and tetQ) and the class 1 integron intI1 gene via the application of two coagulants: FeCl3 and polyferric chloride (PFC)...
January 4, 2017: Water Research
https://www.readbyqxmd.com/read/28088715/micropollutant-induced-tolerance-of-in-situ-periphyton-establishing-causality-in-wastewater-impacted-streams
#18
Ahmed Tlili, Juliane Hollender, Cornelia Kienle, Renata Behra
The overarching aim of this field study was to examine causal links between in-situ exposure to complex mixtures of micropollutants from wastewater treatment plants and effects on freshwater microbial communities in the receiving streams. To reach this goal, we assessed the toxicity of serial dilutions of micropollutant mixtures, extracted from deployed passive samplers at the discharge sites of four Swiss wastewater treatment plants, to in situ periphyton from upstream and downstream of the effluents. On the one hand, comparison of the sensitivities of upstream and downstream periphyton to the micropollutant mixtures indicated that algal and bacterial communities composing the periphyton displayed higher tolerance towards these micropollutants downstream than upstream...
January 7, 2017: Water Research
https://www.readbyqxmd.com/read/28088571/theophylline-assisted-eco-friendly-synthesis-of-ptau-nanospheres-at-reduced-graphene-oxide-with-enhanced-catalytic-activity-towards-cr-vi-reduction
#19
Ling-Ya Hu, Li-Xian Chen, Meng-Ting Liu, Ai-Jun Wang, Lan-Ju Wu, Jiu-Ju Feng
Theophylline as a naturally alkaloid is commonly employed to treat asthma and chronic obstructive pulmonary disorder. Herein, a facile theophylline-assisted green approach was firstly developed for synthesis of PtAu nanospheres/reduced graphene oxide (PtAu NSs/rGO), without any surfactant, polymer, or seed involved. The obtained nanocomposites were applied for the catalytic reduction and removal of highly toxic chromium (VI) using formic acid as a model reductant at 50°C, showing the significantly enhanced catalytic activity and improved recyclability when compared with commercial Pt/C (50%) and home-made Au nanocrystals supported rGO (Au NCs/rGO)...
December 31, 2016: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28088531/the-effect-of-dissolved-organic-matter-on-soybean-peroxidase-mediated-removal-of-triclosan-in-water
#20
Jianhua Li, Ya Zhang, Jianbiao Peng, Xinan Wu, Shixiang Gao, Liang Mao
Dissolved organic matter (DOM) is ubiquitous in water and involved in numerous important chemical processes in aqueous systems, enabling it a unique challenge for a variety of water treatment processes. Soybean peroxidase (SBP)-based enzymatic process, as a promising treatment technique, has been successfully applied to remove pollutants in wastewaters such as coal-tar and refinery wastewater. In this study, the effect of DOM on the removal of polychlorinated aromatic antimicrobials triclosan (TCS) by SBP was investigated...
January 5, 2017: Chemosphere
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