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

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https://www.readbyqxmd.com/read/29149918/oxygen-transfer-in-moving-bed-biofilm-reactor-and-integrated-fixed-film-activated-sludge-processes
#1
(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
#2
(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
#3
(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/29046168/combined-treatment-of-mezcal-vinasses-by-ozonation-and-activated-sludge
#4
(no author information available yet)
In Mexico, mezcal production generates huge amounts of vinasses (MV) that cause negative environmental impacts. Thus, MV treatment is necessary before discharge to water bodies. Although there is no information for mezcal vinasses, similar effluents have been treated by biological processes (i.e. anaerobic and aerobic) usually complemented by oxidative chemical pretreatments (ozonation) and physico-chemical methods. In this work MV were first ozonated and followed by batch aerobic biological degradation. In the ozonation stage, organic matter removals were 4...
October 18, 2017: Water Environment Research: a Research Publication of the Water Environment Federation
https://www.readbyqxmd.com/read/29046169/response-of-epiphytic-algae-to-heavy-pollution-of-water-bodies
#5
(no author information available yet)
The objective of the present work was to study the structure of epiphyton in water bodies significantly differing in the degree of their contamination. In the studied water bodies, the concentration of ammonia (NH4+-N) accounted for 0.04-74.00 mg/L, nitrite (NO2--N) - 0.002-1.750 mg/L, nitrate (NO3--N) - 0.13-58.00 mg/L, inorganic compounds of phosphorus (Pinorg) - 0.041-0.272 mg/L, chloride (Cl-) - 34.5-560.5 mg/L, whereas the content of organic matter (DO) - 18.0-81.0 mg O/L. The numbers of algae were determined by the method of a direct count...
October 17, 2017: Water Environment Research: a Research Publication of the Water Environment Federation
https://www.readbyqxmd.com/read/29050550/potential-changes-in-chemical-soil-quality-resulting-from-graywater-recycling-for-landscape-irrigation
#6
(no author information available yet)
The effects of graywater irrigation on soil chemical properties and accumulation of surfactants and antimicrobials wereinvestigated at three households in Arizona, California and Colorado over the duration of two to three years. No negative impacts were observed with respect to sodium and boron accumulation in soil over the duration of this study. Graywater irrigation significantly increased organic matter and total inorganic nitrogen of the receiving soil (P<0.05). Graywater loading rates and fertilizer application should be monitored to ensure that excessive amount of nitrogen and phosphorus are not applied to the soil...
October 13, 2017: Water Environment Research: a Research Publication of the Water Environment Federation
https://www.readbyqxmd.com/read/29050549/biosorptive-removal-of-cadmium-by-tinospora-cordifolia-wild-giloy
#7
(no author information available yet)
This research reports the efficacy of Tinospora cordifolia as biosorbent for removing cadmium ions from industrial effluents. The biosorption capacity was found to be 38.91mg Cd/g and 43.06mg Cd/g at batch and column mode experiments respectively. The work included uptake capacity, equilibrium study and column study at varying pH (1-9), contact time (5-240minutes), biosorbent dosages (1-8 g) initial metal concentration (10-1000 mg/L). Both Langmuir and Freundlich isotherm model were applied to study the dose-response behavior and it was observed that the Freundlich model provided highest R2 value...
October 12, 2017: Water Environment Research: a Research Publication of the Water Environment Federation
https://www.readbyqxmd.com/read/28962671/tools-for-metagenomic-analysis-at-wastewater-treatment-plants-application-to-a-foaming-episode
#8
(no author information available yet)
Metagenomic analysis is a powerful approach for wholesale characterizations of microbial populations like those that operate within municipal wastewater treatment plant. It is well-known that many problems are associated with the overgrowth or undergrowth of specific bacterial genera. We describe a database of the combined metagenomes of activated sludge aeration basins from around the globe and use it as a reference to study the population of a foamy activated sludge aeration basin. We show that foam production is associated with blooms of mycolic acid producing genera, especially Mycobacterium...
September 29, 2017: Water Environment Research: a Research Publication of the Water Environment Federation
https://www.readbyqxmd.com/read/28962672/spatial-variation-of-metals-in-batang-arau-river
#9
(no author information available yet)
This paper aims to assess the metallic pollution in Batang Arau River, an important source of fresh water supply for local communities in West Sumatera, Indonesia, by applying multivariate statistical techniques. Sampling was conducted at 8 stations along the river during March-May 2014. The results indicated that all the metals studied have similar spatial distribution pattern, with an increasing trend in concentration from upstream to downstream. Total concentrations of six metals studied at the upstream as background concentration was 1...
September 26, 2017: Water Environment Research: a Research Publication of the Water Environment Federation
https://www.readbyqxmd.com/read/28962673/adm1-simulation-of-high-solid-anaerobic-digestion-with-feasibility-study-for-el-gabal-el-asfar-wwtp
#10
(no author information available yet)
Performance of continuous mesophilic high-solid anaerobic digestion (HSAD) was simulated using Anaerobic Digestion Model No 1 (ADM1), under different conditions (solid concentrations, sludge retention time [SRT], organic loading rate [OLR] and type of sludge), ADM1 implementation using the proposed biochemical parameters proved to be useful tool for the prediction and control of HSAD as the model predicted the behavior of the tested sets of data with a considerable accuracy especially for SRT more than 13 days...
September 25, 2017: Water Environment Research: a Research Publication of the Water Environment Federation
https://www.readbyqxmd.com/read/28915931/nutrient-removal-from-wastewater-using-microalgae-a-kinetic-evaluation-and-lipid-analysis
#11
(no author information available yet)
The objective of this study was to examine the performance of mixed microalgal bioreactors in treating three differenttypes of wastewaters - kitchen wastewater (KWW), palm oil mill effluent (POME), and pharmaceutical wastewater (PWW) in semi-continuous mode and to analyze the lipid content in the harvested algal biomass. The reactors were monitored for total nitrogen and phosphate removal at eight solid retention times (SRTs) - 2, 4, 6, 8, 10, 12, 14, and 16 days. The nutrient uptake kinetic parameters were quantified using linearized Michaelis-Menten and Monod models at steady-state conditions...
September 15, 2017: Water Environment Research: a Research Publication of the Water Environment Federation
https://www.readbyqxmd.com/read/28915932/evaluation-of-meiofauna-in-the-hyporheic-zone-of-the-beberibe-river-pernambuco-brazil
#12
(no author information available yet)
The hyporheic environment is composed of a rich meiofauna that depends on the water flow, organic matter and oxygen. The concentration of meiofauna varies spatially (horizontal and vertical) and temporally. Several processes occur at this interface (groundwater and surface water), including biogeochemical processes involving meiofauna. A study on the hyporheic meiofauna community was conducted in sediments of Beberibe River, in Brazil. Meiofauna attained peak densities of 942.8 organisms / 10 cm2, with organisms being distributed over six taxa with 98% of them represented by rotifers, nematodes and annelids...
September 14, 2017: Water Environment Research: a Research Publication of the Water Environment Federation
https://www.readbyqxmd.com/read/28886755/revisiting-coiled-flocculator-performance-for-particle-aggregation
#13
(no author information available yet)
This work summarizes recent studies evaluating the torsion and curvature parameters in the flocculation efficiency using a hydraulic plug-flow flocculator named as Flocs Generator Reactor (FGR). Colloidal Fe(OH)3 and coal particles were used as suspension models and a cationic polyacrylamide was used for the flocculation. The effectiveness of the aggregation process (in the distinct curvature and torsion parameters and hydrodynamic conditions) was evaluated by the settling rate of the Fe(OH)3 flocs and flocs size by photographic analysis...
September 8, 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
#14
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
#15
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
#16
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
#17
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
#18
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
#19
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
https://www.readbyqxmd.com/read/29080564/use-of-multiple-data-assimilation-techniques-in-groundwater-contaminant-transport-modeling
#20
Amirul Islam Rajib, Godwin Appiah Assumaning, Shoou-Yuh Chang, Elvis Boamah Addai
  Groundwater contamination assessment can be useful in taking proper actions during environmental emergency. A three-dimensional deterministic model was taken into consideration to simulate the advective-diffusive transport of non-conservative contaminant in groundwater. Multiple stochastic data assimilation techniques, such as, ensemble Kalman filter (EnKF), local ensemble transform Kalman filter (LETKF), and the global form of the LETKF, denoted as GETKF were applied to the model. The results show that data assimilation improved contaminant concentration prediction...
November 1, 2017: Water Environment Research: a Research Publication of the Water Environment Federation
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