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Water Environment Research: a Research Publication of the Water Environment Federation

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https://www.readbyqxmd.com/read/29301593/artificial-intelligent-platform-as-decision-tool-for-asset-management-operations-and-maintenance
#1
(no author information available yet)
An Artificial Intelligence (AI) system has been developed and implemented for water, wastewater and reuse plants to improve management of sensors, short and long term maintenance plans, asset and investment management plans. It is based on an integrated approach to capture data from different computer systems and files. It adds a layer of intelligence to the data. It serves as a repository of key current and future operations and maintenance conditions that a plant needs have knowledge of. With this information, it is able to simulate the configuration of processes and assets for those conditions to improve or optimize operations, maintenance and asset management, using the IViewOps (Intelligent View of Operations) model...
January 4, 2018: Water Environment Research: a Research Publication of the Water Environment Federation
https://www.readbyqxmd.com/read/29149918/oxygen-transfer-in-moving-bed-biofilm-reactor-and-integrated-fixed-film-activated-sludge-processes
#2
(no author information available yet)
A demonstrated approach to design the, so-called, medium-bubble air diffusion network for oxygen transfer into the aerobic zone(s) of moving bed biofilm reactor (MBBR) and integrated fixed-film activated sludge (IFAS) processes is described in this paper. Operational full-scale biological water resource recovery systems treating municipal sewerage demonstrate that medium-bubble air diffusion networks designed using the method presented here provide reliable service. Further improvement is possible, however, as knowledge gaps prevent more rational process designs...
November 17, 2017: Water Environment Research: a Research Publication of the Water Environment Federation
https://www.readbyqxmd.com/read/29096735/development-and-application-of-a-model-to-study-water-technology-adoption-and-dissemination
#3
(no author information available yet)
This paper develops a set of criteria that can be used to study industry adoption and dissemination of water technologies through various stages of a market adoption model. It tests the applicability of these criteria on a diverse array of over 488 water technologies. Based on case-studies, it seeks to define the typical and reasonable time-frames in which a water technology moves through these defined stages of industry adoption and dissemination. The development of these criteria and the definition reasonable industry average time-lines to move through these stages is an important contribution to the understanding of the process of water technology development...
November 2, 2017: Water Environment Research: a Research Publication of the Water Environment Federation
https://www.readbyqxmd.com/read/29096733/bioaugmentation-with-nitrifying-granules-in-low-srt-flocculent-activated-sludge-at-low-temperature
#4
(no author information available yet)
Nitrifying granules were grown in a sidestream reactor fed municipal anaerobic digestion centrate and added in an initial slug dose and subsequent smaller daily doses to a non-nitrifying mainstream activated sludge system at 12C and 2.5-day aerobic solids retention time (SRT) to increase its nitrification capacity. Effluent NH3-N concentrations less than 1 mg/L were achieved with bioaugmentation, and nitrification was immediately lost when granules were removed after 30 days of bioaugmentation. Molecular microbial analyses indicated that nitrifying organisms remained attached to granules in the mainstream system with little loss to the flocculent sludge...
November 1, 2017: Water Environment Research: a Research Publication of the Water Environment Federation
https://www.readbyqxmd.com/read/29268842/metal-speciation-in-the-rivers-around-potchefstroom-based-on-seasonality
#5
Alusani Manyatshe, Elvis Fosso-Kankeu, Divan van der Berg, Nico Lemmer, Frans Waanders, Hlanganani Tutu
  About 44 surface water samples were collected in the wet and dry seasons around mining areas near the city of Potchefstroom in South Africa, and physicochemical parameters were analyzed to assess the speciation of pollutants and impact on dispersion potential. It was found that concentrations of the trace elements measured decreased significantly during the dry season. High concentrations of trace elements during the wet season were correlated to high effluents from anthropogenic sources which were flowing into the surface water...
January 1, 2018: Water Environment Research: a Research Publication of the Water Environment Federation
https://www.readbyqxmd.com/read/29268841/application-of-fuzzy-set-qualitative-comparative-analysis-to-public-participation-projects-in-support-of-the-eu-water-framework-directive
#6
Carlos Llopis-Albert, José M Merigó, Yejun Xu, Huchang Liao
  This study analyzes the level of satisfaction of stakeholders in the public participation process (PPP) of water resources management, which is mandatory according to the EU Water Framework Directive (WFD). The methodology uses a fuzzy set/qualitative comparative analysis (fsQCA), which allows the identification of a combination of factors that lead to the outcome that is stakeholders' satisfaction. It allows dealing with uncertain environments due to the heterogeneous nature of stakeholders and factors...
January 1, 2018: Water Environment Research: a Research Publication of the Water Environment Federation
https://www.readbyqxmd.com/read/29268840/characterizations-of-polysulfone-ferrihydrite-mixed-matrix-membranes-for-water-wastewater-treatment
#7
Norfadhilatuladha Abdullah, Norhaniza Yusof, Rasool J Gohari, Ahmad F Ismail, Juhana Jaafar, Woei J Lau, Nurasyikin Misdan, Nur H H Hairom
  This study aimed to investigate the effects of ferrihydrite (Fh) nanoparticle loading on the physicochemical properties of polysulfone (PSf) membranes fabricated via the phase inversion method. The morphologies and physicochemical properties of prepared Fh and PSf/Fh mixed matrix membranes (MMMs) were characterized using transmission electron microscopy (TEM), X-ray diffraction analysis (XRD), Fourier transmission infra-red (FTIR), scanning electron microscopy (SEM), atomic force microscopy (AFM), pure water flux analysis, contact angle measurement, and membrane porosity analysis...
January 1, 2018: Water Environment Research: a Research Publication of the Water Environment Federation
https://www.readbyqxmd.com/read/29268839/environmental-evaluation-of-soil-salinity-with-various-watering-technologies-assessment
#8
Adeubay Seitkaziev, Kenzhegali Shilibek, Idiya Fakhrudenova, Satybaldy Salybayev, Sayagul Zharapova, Saule Duisenbayeva, Zulfia Bayazitova, Maimakova Aliya, Karlygash Seitkazieva, Hamit Aubakirov
  The purpose of this study is to develop mathematical tools for evaluating the level of environmental safety of various watering technologies. A set of indicators, was developed with regard to the natural factors, the nature of the man-induced load, degradation type, and characteristics of the disruption of humification conditions. Thermal and physical characteristics of the soil, the state of its surface, and meteorological factors, including air temperature, relative humidity, precipitation, wind speed, solar radiation, etc...
January 1, 2018: Water Environment Research: a Research Publication of the Water Environment Federation
https://www.readbyqxmd.com/read/29268838/impacts-of-srt-on-particle-size-distribution-and-reactor-performance-in-activated-sludge-processes
#9
Zhongtian Li, Michael K Stenstrom
  Particle size distribution of the particulates is an essential characteristic of the wastewater quality. Particle size of activated sludge flocs may affect key sludge handling processes including sedimentation, thickening, digestion, and dewatering. This study evaluated the effects of solids retention time (SRT) on particle size distribution, sludge settleability, effluent turbidity, and removals of chemical oxygen demand (COD) and <inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="00048-ilm01...
January 1, 2018: Water Environment Research: a Research Publication of the Water Environment Federation
https://www.readbyqxmd.com/read/29268837/thermogravimetric-analysis-of-textile-dyeing-sludge-tds-in-n%C3%A2-co%C3%A2-o%C3%A2-atmospheres-and-its-combustion-model-with-coal
#10
Zhongxu Zhuo, Jingyong Liu, Shuiyu Sun, Jiahong Kuo, Jian Sun, Ken-Lin Chang, Jiewen Fu
  The combustion characteristics of textile dyeing sludge (TDS) in N2/O2, CO2/O2, and N2/CO2 atmospheres, and blends of TDS with coal were analyzed using TGA (thermogravimetric analysis). Results showed that the replacement of N2 by CO2 resulted in negative effects on the combustion and pyrolysis of TDS. Comparing N2/O2 and CO2/O2 atmospheres, combustion of TDS was easier in a N2/O2 atmosphere, but the residual mass after TDS pyrolysis in pure CO2 was less than that in N2 by approximately 4.51%. When the proportion of TDS was 30-50% in the blends of coal with TDS, a synergistic interaction clearly occurred, and it significantly promoted combustion...
January 1, 2018: Water Environment Research: a Research Publication of the Water Environment Federation
https://www.readbyqxmd.com/read/29268836/characterization-of-hydrolysis-kinetics-in-staged-anaerobic-digestion-of-wastewater-treatment-sludge
#11
Mirzaman Zamanzadeh, Wayne J Parker
  The hydrolysis of mixed primary and secondary sludges in two-stage anaerobic digestion was evaluated and compared with conventional single-stage digestion, using various temperature-phased configurations of M1-M2, M1-T3, T1-T2, and T1-M3. A dual hydrolysis model best described the hydrolysis in all tests. This model was also able to consistently estimate the readily and slowly fractions of particulate chemical oxygen demand (COD) of raw sludge used in the tests. The hydrolysis kinetic coefficients (Khyd_s and Khyd_r) estimated for the mesophilic digesters were significantly greater in the short hydraulic retention time (HRT) M1 digester than those of the extended HRT digesters...
January 1, 2018: Water Environment Research: a Research Publication of the Water Environment Federation
https://www.readbyqxmd.com/read/29166994/biological-phosphorus-recovery-review-of-current-progress-and-future-needs
#12
Yu Yang, Xu Shi, Wendy Ballent, Brooke K Mayer
  This review summarizes the main species of polyphosphate accumulating organisms (PAOs) and algae, illustrates their pathways and key enzymes, discusses biological phosphorous (P) recovery from dilute waters, and identifies research avenues to encourage adoption and implementation. Phylogenic analysis indicates that the Proteobacteria phylum plays an important role in enhanced biological phosphorus removal (EBPR). The use of meta-transcriptome analysis and single cell-based techniques to help overcome the challenges associated with non-PAO competition was discussed...
December 1, 2017: Water Environment Research: a Research Publication of the Water Environment Federation
https://www.readbyqxmd.com/read/29166993/aerobic-biodegradation-of-ocdd-by-p-mendocina-nsysu-effectiveness-and-gene-inducement-studies
#13
J L Lin, W C Lin, J K Liu, R Y Surampalli, T C Zhang, C M Kao
  The goals of this study were to assess the effectiveness of (1) enhancing octachlorinated dibenzo-p-dioxin (OCDD) biodegradation under aerobic conditions by Pseudomonas mendocina NSYSU (P. Mendocina NSYSU) with the addition of lecithin, and (2) inducing OCDD ring-cleavage genes by pentachlorophenol (PCP) and OCDD addition. P. Mendocina NSYSU could biodegrade OCDD via aerobic cometabolism and lecithin was used as a primary substrate. Approximately 74 and 67% of OCDD biodegradation was observed after 60 days of incubation with lecithin and glucose supplement, respectively...
December 1, 2017: Water Environment Research: a Research Publication of the Water Environment Federation
https://www.readbyqxmd.com/read/29166992/use-of-alum-for-odor-reduction-in-sludge-and-biosolids-from-different-wastewater-treatment-processes
#14
Yolanta Gruchlik, Lise Fouché, Cynthia A Joll, Anna Heitz
  Applicability of alum addition to wastewater sludge and biosolids produced from different treatment processes was evaluated as a means of odor reduction. Four water resource recovery facilities (WRRFs) were chosen for this study: two used mesophilic anaerobic digestion and two used oxidation ditch processes. The experiments were conducted on a laboratory scale and in all cases the alum was added prior to dewatering. This is the first report of the application of alum for odor reduction in oxidation ditch processes...
December 1, 2017: Water Environment Research: a Research Publication of the Water Environment Federation
https://www.readbyqxmd.com/read/29080570/of-laboratory-evaluation-of-sorptive-filtration-media-mixtures-for-targeted-pollutant-removals-from-simulated-stormwater-g-prabhukumar-g-s-bhupal-k-r-pagilla-87-789-795-2015
#15
William P Minervini
No abstract text is available yet for this article.
November 1, 2017: Water Environment Research: a Research Publication of the Water Environment Federation
https://www.readbyqxmd.com/read/29080569/rethinking-the-mechanisms-of-biological-phosphorus-removal
#16
James L Barnard, Patrick Dunlap, Mark Steichen
  Enhanced biological phosphorus removal (EBPR) was observed in high-rate, non-nitrifying plants in the United States that were operated in a plug-flow mode. In facilities designed for nitrification and denitrification, a first-stage anaerobic zone, free of nitrate and nitrite was needed to accomplish EBPR, and this is referred to as the Phoredox (a.k.a. the AO and A2O) process. When a biological mechanism responsible for EBPR was proposed, these treatment configurations were accepted as normal practice, but many later observations showed that more reliable phosphorus removal could be achieved with alternative configurations...
November 1, 2017: Water Environment Research: a Research Publication of the Water Environment Federation
https://www.readbyqxmd.com/read/29080568/landfill-leachate-treatment-by-electrocoagulation-and-fiber-filtration
#17
Runwei Li, Boya Wang, Owete Owete, Joe Dertien, Chen Lin, Hafiz Ahmad, Gang Chen
  Landfilling is widely adopted as one of the most economical processes for solid waste disposal. At the same time, landfill leachate is also a great environmental concern owing to its complex composition and high concentrations of contaminants. This research investigated electrocoagulation and fiber filtration for the treatment of landfill leachate. Besides electrical current (i.e., current density) and reaction time, pH played a very important role in arsenic and phosphorus removal by electrocoagulation...
November 1, 2017: Water Environment Research: a Research Publication of the Water Environment Federation
https://www.readbyqxmd.com/read/29080567/mechanistic-study-on-size-exclusion-of-nom-onto-porous-tio%C3%A2-for-target-contaminants-decomposition
#18
Abolfazl Zakersalehi, Hesam Zamankhan, Mallikarjuna Nadagouda, Hyeok Choi
  Nonselective oxidation of organic chemicals during TiO2 photocatalytic water treatment significantly prohibits decomposition of toxic target contaminants, particularly in the presence of naturally abundant less toxic natural organic matter (NOM). To minimize the adverse effect of NOM, the authors have investigated physical size exclusion of large NOM onto mesoporous TiO2 photocatalysts, which allows small target contaminants to selectively access the porous structure for subsequent chemical reaction. Various treatment scenarios tested with different targets (ibuprofen, microcystin-LR) and competitors (humic acid, polyethylene glycol), and a series of mesoporous TiO2 materials proved the size exclusion mechanism...
November 1, 2017: Water Environment Research: a Research Publication of the Water Environment Federation
https://www.readbyqxmd.com/read/29080566/removal-efficiency-of-different-gemini-surfactants-and-related-modified-clay-to-chattonella-marina
#19
Wen-Wen Wang, Xin-Ya Yan, Yun-Hui Li, De-Ren Yu, Hong-Ye Li, Wei-Dong Yang, Jie-Sheng Liu
  To obtain new modified clays with excellent algae removal efficiency, three gemini surfactants including ethylene bis (dodecyl dimethyl ammonium chloride), ethylene bis (octadecyl dimethyl ammonium chloride) and ethylene bis (dodecyl dimethyl ammonium bromide) (EDAB), and a poly quaternary ammonium salt, poly dimethyl diallyl ammonium chloride, were screened with Chattonella marina. The four chemicals all exhibited high removal efficiencies against C. marina, with EDAB achieving the highest. A series of organ-clays with different ratios of EDAB were prepared, and the associated removal efficiencies were evaluated...
November 1, 2017: Water Environment Research: a Research Publication of the Water Environment Federation
https://www.readbyqxmd.com/read/29080565/screening-and-degradation-mechanism-of-a-cold-resistant-nitrobenzene-degrading-microorganism
#20
Liping Qiu, Hu Wang, Xuntao Wang
  A cold-resistant nitrobenzene-degrading strain was screened from river sediment. The strain was identified as Methylobacillus glycogens, which has never been reported to be capable of degrading nitrobenzene. The degradation rates of 900 μg/L nitrobenzene reached respectively 99.3% and 88.6% in 144 h under both aerobic and anaerobic environments (30 mL inoculation volume at 12 ± 0.5 °C and pH7.0 ± 0.1). When aerobically degraded, nitrobenzene was firstly oxidized into o-nitrophenol, which was further oxidized into 1,2-benzenediol, meanwhile releasing NO2-...
November 1, 2017: Water Environment Research: a Research Publication of the Water Environment Federation
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