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https://www.readbyqxmd.com/read/28335452/fabrication-and-water-treatment-application-of-carbon-nanotubes-cnts-based-composite-membranes-a-review
#1
REVIEW
Lining Ma, Xinfa Dong, Mingliang Chen, Li Zhu, Chaoxian Wang, Fenglin Yang, Yingchao Dong
Membrane separation technology is widely explored for various applications, such as water desalination and wastewater treatment, which can alleviate the global issue of fresh water scarcity. Specifically, carbon nanotubes (CNTs)-based composite membranes are increasingly of interest due to the combined merits of CNTs and membrane separation, offering enhanced membrane properties. This article first briefly discusses fabrication and growth mechanisms, characterization and functionalization techniques of CNTs, and then reviews the fabrication methods for CNTs-based composite membranes in detail...
March 18, 2017: Membranes
https://www.readbyqxmd.com/read/28334666/bio-refractory-dissolved-organic-matter-and-colorants-in-cassava-distillery-wastewater-characterization-coagulation-treatment-and-mechanisms
#2
Ming Zhang, Zhou Wang, Penghui Li, Hua Zhang, Li Xie
An important portion of organic matter and colorants still remain in the biologically treated distillery wastewater, leaving the dark brown and odorous downstream with the heavy loading of chemical oxygen demand and the potential of forming disinfection byproducts. However, those bio-recalcitrant colorants have not been clearly recognized. The current study investigated the features of the bio-refractory organic matter and colorants in a typical distillery effluent, cassava distillery wastewater; special attention was paid to their change and behaviors in the coagulation treatment following the bio-processes...
March 20, 2017: Chemosphere
https://www.readbyqxmd.com/read/28334656/lipid-profiling-in-sewage-sludge
#3
Fenfen Zhu, Xuemin Wu, Luyao Zhao, Xiaohui Liu, Juanjuan Qi, Xueying Wang, Jiawei Wang
High value-added reutilization of sewage sludge from wastewater treatment plants (WWTPs) is essential in sustainable development in WWTPs. However, despite the advantage of high value reutilization, this process must be based on a detailed study of organics in sludge. We used the methods employed in life sciences to determine the profile of lipids (cellular lipids, free fatty acids (FFAs), and wax/gum) in five sludge samples obtained from three typical WWTPs in Beijing; these samples include one sludge sample from a primary sedimentation tank, two activated sludge samples from two Anaerobic-Anoxic-Oxic (A2/O) tanks, and two activated sludge samples from two membrane bioreactor tanks...
March 20, 2017: Water Research
https://www.readbyqxmd.com/read/28334619/investigation-on-metal-tolerance-and-phytoremoval-activity-in-the-poplar-hybrid-clone-monviso-under-cu-spiked-water-potential-use-for-wastewater-treatment
#4
Fabrizio Pietrini, Daniela Di Baccio, Valentina Iori, Sofia Veliksar, Natalia Lemanova, Liudvika Juškaitė, Audrius Maruška, Massimo Zacchini
A serious concern for the environmental and human health is represented by the increasing copper (Cu) occurrence in agricultural soils and waters, because of the possible food contamination and bioaugmentation along the trophic chain. The request for the decontamination of different matrices with an environmentally sustainable technology as the phytoremediation should be addressed by selecting plant materials with improved pollutant tolerance and removal capability. With this purpose, plants of the hybrid poplar clone "Monviso" (Populus×generosa A...
March 20, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28334102/predation-by-bdellovibrio-bacteriovorus-significantly-reduces-viability-and-alters-the-microbial-community-composition-of-activated-sludge-flocs-and-granules
#5
Shugeng Feng, Chuan Hao Tan, Florentin Constancias, Gurjeet S Kohli, Yehuda Cohen, Scott A Rice
We recently isolated and characterized a predatory Bdellovibrio bacteriovorus strain from activated sludge (Ulu Pandan Water Reclamation Plant, Singapore), and this strain, B. bacteriovorus UP was able to prey upon a broad spectrum of bacterial isolates from the activated sludge when grown as planktonic cells or as biofilms. Here, we have tested the effect of Bdellovibrio predation on floccular and granular sludge to determine if the spatial organization, loosely or tightly aggregated communities, was protective from predation...
February 21, 2017: FEMS Microbiology Ecology
https://www.readbyqxmd.com/read/28333060/can-dna-sequencing-show-differences-between-microbial-communities-in-polish-and-danish-wastewater-treatment-plants
#6
A Miłobędzka, A Muszyński
The microbial populations in the activated sludge of two Polish wastewater treatment plants (WWTPs) were identified and quantified using Illumina sequencing of 16S ribosomal RNA amplicons over a 2-year period. Their dynamics over time were compared to Danish WWTPs (data collected in previous studies by Center for Microbial Communities, Aalborg University). The bacterial communities in Polish and Danish WWTPs were similar to each other, but the microbial diversity in Polish WWTPs was lower. The dominant genera in Polish WWTPs were more abundant than in Danish WWTPs; 30 of them constituted more than half the of activated sludge community...
March 2017: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/28333058/advanced-treatment-of-petrochemical-secondary-effluent-by-fenton-performance-and-organics-removal-characteristics
#7
Min Xu, Changyong Wu, Yuexi Zhou
The Fenton process was used to treat petrochemical secondary effluent. The effects of initial pH, H2O2, and FeSO4·7H2O dosages on chemical oxygen demand (COD) removal, the dissolved organic matter (DOM) removal and the transformation and migration of typical organic matters during the treatment process were investigated. The results showed that the optimum conditions were initial pH of 3.0, H2O2 (30%) dosage of 0.4 mL/L, and FeSO4·7H2O dosage of 1.0 g/L. The highest COD removal efficiency of 61.9% could be achieved for this condition when the average influent COD was 78...
March 2017: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/28333054/removal-of-organic-phosphorus-and-formaldehyde-in-glyphosate-wastewater-by-cwo-and-the-lime-catalyzed-formose-reaction
#8
Bo Xing, Honglin Chen, Xiaoming Zhang
Glyphosate (PMG) wastewater with 40-600 mg/L organic phosphorus (OP) and 1-4% CH2O was treated by catalytic wet oxidation (CWO) and the lime-catalyzed formose reaction to remove total phosphorus (TP) and improve biodegradability. Activated carbons (ACs) modified by H2O2 oxidation and thermal treatment with melamine were used as CWO catalysts and characterized by N2 adsorption/desorption and XPS. The CWO experiments were performed in an autoclave reactor at 110-130 °C and 1.0 MPa. The modified AC showed higher catalytic activity than the parent AC due to the introduction of nitrogen-containing functional groups, exhibited over 90% OP removal for various real PMG wastewaters, and had good stability for 20 consecutive CWO runs...
March 2017: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/28333051/artificial-intelligence-based-model-for-optimization-of-cod-removal-efficiency-of-an-up-flow-anaerobic-sludge-blanket-reactor-in-the-saline-wastewater-treatment
#9
Alain R Picos-Benítez, Juan D López-Hincapié, Abraham U Chávez-Ramírez, Adrián Rodríguez-García
The complex non-linear behavior presented in the biological treatment of wastewater requires an accurate model to predict the system performance. This study evaluates the effectiveness of an artificial intelligence (AI) model, based on the combination of artificial neural networks (ANNs) and genetic algorithms (GAs), to find the optimum performance of an up-flow anaerobic sludge blanket reactor (UASB) for saline wastewater treatment. Chemical oxygen demand (COD) removal was predicted using conductivity, organic loading rate (OLR) and temperature as input variables...
March 2017: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/28333044/effects-of-c-n-ratio-on-nitrous-oxide-production-from-nitrification-in-a-laboratory-scale-biological-aerated-filter-reactor
#10
Qiang He, Yinying Zhu, Leilei Fan, Hainan Ai, Xiaoliu Huangfu, Mei Chen
Emission of nitrous oxide (N2O) during biological wastewater treatment is of growing concern. This paper reports findings of the effects of carbon/nitrogen (C/N) ratio on N2O production rates in a laboratory-scale biological aerated filter (BAF) reactor, focusing on the biofilm during nitrification. Polymerase chain reaction-denaturing gradient gel electrophoresis (PCR-DGGE) and microelectrode technology were utilized to evaluate the mechanisms associated with N2O production during wastewater treatment using BAF...
March 2017: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/28333043/sequential-anaerobic-aerobic-biological-treatment-of-colored-wastewaters-case-study-of-a-textile-dyeing-factory-wastewater
#11
Fardin Abiri, Narges Fallah, Babak Bonakdarpour
In the present study the feasibility of the use of a bacterial batch sequential anaerobic-aerobic process, in which activated sludge was used in both parts of the process, for pretreatment of wastewater generated by a textile dyeing factory has been considered. Activated sludge used in the process was obtained from a municipal wastewater treatment plant and adapted to real dyeing wastewater using either an anaerobic-only or an anaerobic-aerobic process over a period of 90 days. The use of activated sludge adapted using the anaerobic-aerobic process resulted in a higher overall decolorization efficiency compared to that achieved with activated sludge adapted using the anaerobic-only cycles...
March 2017: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/28332930/vertical-profiling-and-modelling-of-e-coli-decay-in-a-shallow-maturation-pond-operating-in-a-tropical-climate
#12
Daniel F C Dias, Marcos von Sperling
Maturation ponds are excellent natural treatment systems for disinfecting domestic wastewater from pathogenic bacteria because of great sunlight exposure through depth and high pH and DO values within its environment, all of which are important factors for disinfection. E. coli removal is higher closer to the surface of the pond and proceeds to decrease due to the limited amount of sunlight penetrating through deeper depths. In order to quantify the decay coefficients (Kb) of E. coli in a shallow maturation pond, quartz vessels were used to create isolated batch experiments and submerged at different depths inside the pond during different periods of the day (morning and afternoon)...
March 23, 2017: Environmental Technology
https://www.readbyqxmd.com/read/28332926/efficient-degradation-of-organic-phosphorus-in-glyphosate-wastewater-by-catalytic-wet-oxidation-using-modified-activated-carbon-as-a-catalyst
#13
Bo Xing, Honglin Chen, Xiaoming Zhang
Glyphosate (PMG) wastewater, which is an organic phosphorus (OP) wastewater containing 200-3000 mg/L glyphosate, was treated via catalytic wet oxidation (CWO) to degrade glyphosate to orthophosphate (PO4(3-)). The catalysts were activated carbons (ACs) modified by H2O2 oxidation and thermal treatment with ammonia or melamine. The catalysts were characterized using N2 adsorption/desorption, Boehm titration, and XPS. The CWO experiments were performed in a co-current upflow fixed bed reactor at 110-130 °C and under 1...
March 23, 2017: Environmental Technology
https://www.readbyqxmd.com/read/28331546/increasing-phosphorus-recovery-from-dewatering-centrate-in-microbial-electrolysis-cells
#14
Pengyi Yuan, Younggy Kim
BACKGROUND: Microbial electrolysis cells (MECs) use bioelectrochemical reactions to remove organic contaminants at the bioanode and produce hydrogen gas at the cathode. High local pH conditions near the cathode can also be utilized to produce struvite from nutrient-rich wastewater. This beneficial aspect was investigated using lab-scale MECs fed with dewatering centrate collected at a local wastewater treatment plant. The main objective was to improve phosphorus recovery by examining various cathode configurations and electric current conditions...
2017: Biotechnology for Biofuels
https://www.readbyqxmd.com/read/28330323/modification-of-sargassum-angustifolium-by-molybdate-during-a-facile-cultivation-for-high-rate-phosphate-removal-from-wastewater-structural-characterization-and-adsorptive-behavior
#15
Firozeh Saberzadeh Sarvestani, Hossein Esmaeili, Bahman Ramavandi
In this paper, a new and facile approach for molybdate loading in the brown algae of Sargassum angustifolium is introduced. The molybdate ions were entered into the algae body during a short cultivation to produce algae-Mo as a novel adsorbent for eliminating phosphate ions from synthetic and real wastewaters. Results of the surface analysis showed that molybdate loading onto the algae was successfully performed. Herein, basic variables, such as initial solution pH, adsorbent dosage, contact time, phosphate concentration, and temperature, were investigated in detail to assess the phosphate adsorption performance of algae-Mo...
December 2016: 3 Biotech
https://www.readbyqxmd.com/read/28330267/treatment-of-landfill-leachate-using-asbr-combined-with-zeolite-adsorption-technology
#16
Chi Kim Lim, Ta Wee Seow, Chin Hong Neoh, Muhamad Hanif Md Nor, Zaharah Ibrahim, Ismail Ware, Siti Hajar Mat Sarip
Sanitary landfilling is the most common way to dispose solid urban waste; however, improper landfill management may pose serious environmental threats through discharge of high strength polluted wastewater also known as leachate. The treatment of landfill leachate to fully reduce the negative impact on the environment, is nowadays a challenge. In this study, an aerobic sequencing batch reactor (ASBR) was proposed for the treatment of locally obtained real landfill leachate with initial ammoniacal nitrogen and chemical oxygen demand (COD) concentration of 1800 and 3200 mg/L, respectively...
December 2016: 3 Biotech
https://www.readbyqxmd.com/read/28330245/co-metabolism-of-thiocyanate-and-free-cyanide-by-exiguobacterium-acetylicum-and-bacillus-marisflavi-under-alkaline-conditions
#17
Lukhanyo Mekuto, Oluwadara Oluwaseun Alegbeleye, Seteno Karabo Obed Ntwampe, Maxwell Mewa Ngongang, John Baptist Mudumbi, Enoch A Akinpelu
The continuous discharge of cyanide-containing effluents to the environment has necessitated for the development of environmentally benign treatment processes that would result in complete detoxification of the cyanide-containing wastewaters, without producing additional environmental toxicants. Since biological detoxification of hazardous chemical compounds has been renowned for its robustness and environmental-friendliness, the ability of the Exiguobacterium acetylicum (GenBank accession number KT282229) and Bacillus marisflavi (GenBank accession number KR016603) to co-metabolise thiocyanate (SCN(-)) and free cyanide (CN(-)) under alkaline conditions was evaluated...
December 2016: 3 Biotech
https://www.readbyqxmd.com/read/28330215/bioremediation-of-high-strength-agricultural-wastewater-using-ochrobactrum-sp-strain-sz1
#18
Chin Hong Neoh, Chi Yong Lam, Suriati Mat Ghani, Ismail Ware, Siti Hajar Mat Sarip, Zaharah Ibrahim
The biggest agricultural sector that contributes to the Malaysian economy is the oil palm industry. The effluent generated during the production of crude palm oil known as palm oil mill effluent (POME). POME undergoes anaerobic treatment that requires long retention time and produces large amount of methane that consequently contributes to global warming. In this study, an isolated bacteria was selected based on its ability to degrade kraft lignin (KL) and identified as Ochrobactrum sp. The bacteria were able to treat POME (from anaerobic pond) under the aerobic condition without addition of nutrient, resulting in a significant chemical oxygen demand (COD) removal of 71 %, removal rate of 1385 mg/l/day, and 12...
December 2016: 3 Biotech
https://www.readbyqxmd.com/read/28330209/biodegradation-of-real-petroleum-wastewater-by-immobilized-hyper-phenol-tolerant-strains-of-bacillus-cereus-in-a-fluidized-bed-bioreactor
#19
Aditi Banerjee, Aloke K Ghoshal
Microbial bioremediation of petroleum wastewater by phenol-degrading-bacteria holds promise in circumventing the issue of petroleum-spill related pollution. Herein, biodegradation of petroleum wastewater samples collected from oil refinery site was carried out in a fluidized bed bioreactor by Ca-alginate immobilized biomass of phenol-degrading strains of Bacillus cereus (AKG1 MTCC9817 and AKG2 MTCC9818). Degradation performance of the system was evaluated by measuring the changes in chemical oxygen demand (COD) and level of phenolic compounds in the wastewater samples during the microbial treatment...
December 2016: 3 Biotech
https://www.readbyqxmd.com/read/28330194/exploited-application-of-sulfate-reducing-bacteria-for-concomitant-treatment-of-metallic-and-non-metallic-wastes-a-mini-review
#20
REVIEW
Ali Hussain, Ali Hasan, Arshad Javid, Javed Iqbal Qazi
A variety of multidimensional anthropogenic activities, especially of industrial level, are contaminating our aquatic and terrestrial environments with a variety of metallic and non-metallic pollutants. The metallic and non-metallic pollutants addressed specifically in this review are heavy metals and various compound forms of sulfates, respectively. Direct and indirect deleterious effects of the both types of pollutants to all forms of life are well-known. The treatment of such pollutants is therefore much necessary before their final discharge into the environment...
December 2016: 3 Biotech
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