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

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https://www.readbyqxmd.com/read/28915931/nutrient-removal-from-wastewater-using-microalgae-a-kinetic-evaluation-and-lipid-analysis
#1
(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
#2
(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
#3
(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/28766483/transesterification-of-waste-activated-sludge-for-biosolids-reduction-and-biodiesel-production
#4
(no author information available yet)
Transesterification of waste activated sludge (WAS) was evaluated as a cost-effective technique to reduce excess biosolids and recover biodiesel feedstock from activated sludge treatment plants. A laboratory-scale sequencing batch reactor (SBR) was operated with recycling transesterification-treated WAS back to the aeration basin. Seventy percent recycling of WAS resulted in 48% reduction of excess biosolids in comparison to a conventional SBR, which was operated in parallel as the control SBR. Biodiesel recovery of 8...
August 1, 2017: Water Environment Research: a Research Publication of the Water Environment Federation
https://www.readbyqxmd.com/read/28745273/performance-and-kinetics-of-nitrification-of-low-ammonia-wastewater-at-low-temperature
#5
(no author information available yet)
The objective of this study was to investigate the effect of DO on nitrification in a sequencing batch reactor (SBR) treating low ammonia wastewater (40 mg N/L) at low temperature (14oC). During the 130 days of operation, three DO levels (5-6 mg DO/L, 2-3 mg DO/L and 0.8-1.0 mg DO/L) were tested. DO reduction resulted in lower ammonia oxidizing bacteria (AOB) and nitrite oxidizing bacteria (NOB) activity with decreasing ammonia conversion ratio (ACR) and increasing nitrite accumulation ratio (NAR). The maximum growth rates of AOB and NOB determined in this study (0...
July 25, 2017: Water Environment Research: a Research Publication of the Water Environment Federation
https://www.readbyqxmd.com/read/28745270/chromosomal-and-nuclear-alterations-in-the-root-tip-cells-of-vicia-faba-induced-by-sodium-chloride
#6
(no author information available yet)
The objective of this study was to investigate the effect of DO on nitrification in a sequencing batch reactor (SBR) treating low ammonia wastewater (40 mg N/L) at low temperature (14oC). During the 130 days of operation, three DO levels (5-6 mg DO/L, 2-3 mg DO/L and 0.8-1.0 mg DO/L) were tested. DO reduction resulted in lower ammonia oxidizing bacteria (AOB) and nitrite oxidizing bacteria (NOB) activity with decreasing ammonia conversion ratio (ACR) and increasing nitrite accumulation ratio (NAR). The maximum growth rates of AOB and NOB determined in this study (0...
July 19, 2017: Water Environment Research: a Research Publication of the Water Environment Federation
https://www.readbyqxmd.com/read/28766484/anaerobic-digestion-effluents-ades-treatment-coupling-with-chlorella-sp-microalgae-production
#7
(no author information available yet)
Nutrient removal effectiveness from anaerobic digestion effluents (ADEs) by Chlorella sp. cultivation and microalgae biomass productivity were evaluated in this study. The results showed that the highest Chlorella sp. biomass productivities of 386.5±24.1 mg dry weight (DW)/L·d and 338.3±11.0 mg DW/L·d were respectively obtained with the anaerobically digested effluent of municipal wastewater sludge (WS) and effluent from a fermentation tank treating dairy wastewater (DW). Lower (p<0.05) microalgal growth was achieved with anaerobically digested effluents of maize silage and swine slurry (MS) and cattle manure (CM)...
July 11, 2017: Water Environment Research: a Research Publication of the Water Environment Federation
https://www.readbyqxmd.com/read/28766488/effect-of-high-strength-food-wastes-on-anaerobic-co-digestion-of-sewage-sludge
#8
(no author information available yet)
Anaerobic co-digestion has been practiced at water resource recovery facilities to increase methane production, but theimpact of many variables is still not well understood. In this study, the feasibility of co-digesting fats, oils and grease (FOG) and other high strength wastes (HSWs) with municipal sewage sludge was investigated. Four lab-scale, digesters were operated at a working volume of 9.75 L, 15 day SRT and temperature of 37 oC. Wastes including whey (cheese), juice, grease trap waste (GTW) and dissolved air flotation waste (DAF), along with municipal sewage sludge, were fed to the digesters in varying amounts...
July 6, 2017: Water Environment Research: a Research Publication of the Water Environment Federation
https://www.readbyqxmd.com/read/28766487/survival-and-antibiotic-resistance-of-bacteria-in-artificial-snow-produced-from-contaminated-water
#9
(no author information available yet)
This study shows microbiological contamination of water in two main Podhale rivers, whose resources are used for artificial snowing, and the resulting snow contamination. 31 E. coli strains were isolated from snow at two ski stations in the studied region, their antimicrobial resistance was determined and the presence of extended-spectrum β-lactamase (ESBL) genes was searched for. The results indicate that waters of both rivers are severely contaminated, resulting in contamination of artificial snow, with among others thermotolerant E...
July 3, 2017: Water Environment Research: a Research Publication of the Water Environment Federation
https://www.readbyqxmd.com/read/28855024/impact-of-high-nitrogen-leachate-on-microfauna-of-aerobic-granular-sludge
#10
Adam Drzewicki, Agnieszka Cydzik-Kwiatkowska, Dorian Mieczkowski
  The microfauna communities present in aerobic granular sludge reactors (e.g., granule sludge batch reactor or GSBR) that are used to treat landfill leachate were studied to determine which taxons are useful as process performance indicators. Communities were analyzed during four periods: a stable reactor operation period at a temperature of 29 °C, a transitional period of biomass adaptation at a temperature of 25 °C, an additional period of stable reactor operation at 25 °C, and at 25 °C after a period of lowered dissolved oxygen concentration...
September 1, 2017: Water Environment Research: a Research Publication of the Water Environment Federation
https://www.readbyqxmd.com/read/28855023/fate-and-toxicity-of-zinc-oxide-nanomaterial-in-municipal-wastewaters
#11
Josh Smeraldi, Rajagopalan Ganesh, Turaj Hosseini, Leila Khatib, Betty H Olson, Diego Rosso
  The production of zinc nanomaterial has increased significantly over the past several years and, as a result, nanoparticles have navigated their way into wastewater streams. The transportation and toxicity of zinc nanomaterial within the wastewater treatment processes is not well known. In this study, the zinc nanomaterial and its fate were characterized in an activated sludge treatment process. The tests performed included batch studies to evaluate abiotic and biotic removal, toxicity studies to evaluate inhibition to coliform and nitrifying bacteria, and bioreactor studies to evaluate impact on operating parameters...
September 1, 2017: Water Environment Research: a Research Publication of the Water Environment Federation
https://www.readbyqxmd.com/read/28855022/simulation-of-rainfall-runoff-response-in-ecological-swale-with-on-line-subsurface-detention-using-infoworks-sd
#12
Hamed Benisi Ghadim, Lai Sai Hin
  The Bio-Ecological Drainage System (BIOECODS) is a sustainable drainage (SUDS) to demonstrate the 'control at source' approaches for urban stormwater management in Malaysia. It is an environmentally friendly drainage system that was designed to increase infiltration, reduce peak flow at outlet, improve water quality, through different BMPs, such as grass swale, retention pond, etc. A special feature of BIOECODS is ecological swale with on-line subsurface detention. This study attempted to create a model of ecological swale with on-line subsurface conveyance system with InfoWorks SD...
September 1, 2017: Water Environment Research: a Research Publication of the Water Environment Federation
https://www.readbyqxmd.com/read/28855021/elimination-of-escherichia-coli-and-salmonella-in-clam-by-using-zeolite-in-a-station-of-depuration
#13
Morsi Gdoura, Hanen Sellami, Lamia Khannous, Najib Ketata, Idriss Ben Neila, Al Ibrahim Traore, Zouhair Chekir, Radhouane Gdoura
  The application of natural zeolite for water and wastewater treatment has been carried out and is still a promising technique in environmental cleaning processes. Natural zeolite can be used to improve the purification process of clams (Ruditapes decussatus). Thus, our study aimed at improving the clam purification system in order to reduce Escherichia coli and eliminate Salmonella in samples artificially contaminated with this bacterium using a natural zeolite to replace the biological filter. The results showed that zeolite used in a depuration system improved the clam purification process...
September 1, 2017: Water Environment Research: a Research Publication of the Water Environment Federation
https://www.readbyqxmd.com/read/28855020/applicability-of-zeolite-based-systems-for-ammonia-removal-and-recovery-from-wastewater
#14
Pallabi Das, Bably Prasad, Krishna Kant Kumar Singh
  Ammonia discharged in industrial effluents bears deleterious effects and necessitates remediation. Integrated systems devoted to recovery of ammonia in a useful form and remediation of the same addresses the challenges of waste management and its utilization. A comparative performance evaluation study was undertaken to access the suitability of different zeolite based systems (commercial zeolites and zeolites synthesized from fly ash) for removal of ammonia followed by its subsequent release. Four main parameters which were studied to evaluate the applicability of such systems for large scale usage are cost-effectiveness, ammonia removal efficiency, performance on regeneration, and ammonia release percentage...
September 1, 2017: Water Environment Research: a Research Publication of the Water Environment Federation
https://www.readbyqxmd.com/read/28855019/performance-study-of-a-low-cost-adsorbent-raw-date-pits-for-removal-of-azo-dye-in-aqueous-solution
#15
Rahima Hachani, Hazourli Sabir, Nouacer Sana, Khelaifia Fatma Zohra, Nait Merzoug Nesrine
  The feasibility of using natural waste (raw date pits) as a low-cost adsorbent for the adsorption of an anionic dye (Congo red) from aqueous solution has been investigated. Adsorption optimized conditions were obtained at low dose 1 g/L, initial dye concentration 100 mg/L, pH 2, equilibrium contact time 120 min, and temperature 20 °C. The corresponding adsorption capacity was around 70 mg/g and could reach 150 mg/g by increasing the ionic strength of the dye solution (0.05 M CaCl2). These results are well modeled by Freundlich isotherm and kinetics study followed by pseudo second-order model...
September 1, 2017: Water Environment Research: a Research Publication of the Water Environment Federation
https://www.readbyqxmd.com/read/28855018/uptake-of-cd-ii-onto-raw-crab-shells-isotherm-kinetic-adsorption-properties-and-mechanisms
#16
Chuanqiang Zhou, Xiangxiang Gong, Wen Zhang, Jie Han, Rong Guo, Aiping Zhu
  This study focuses on the uptake of cadmium (Cd(II)) ion from water onto raw crab shells acting as a biosorbent. Experimental data were perfectly fitted to the Langmuir and Dubinin-Radushkevich models, while the uptake kinetics are well-described using the pseudo-second-order model. The effects of experimental conditions on the uptake isotherms and kinetics are discussed in detail. A study of uptake thermodynamics has indicated that the Cd(II) uptake onto the crab shell is an endothermic and spontaneous process...
September 1, 2017: Water Environment Research: a Research Publication of the Water Environment Federation
https://www.readbyqxmd.com/read/28855017/methylene-blue-adsorption-on-a-low-cost-adsorbent-carbonized-peanut-shell
#17
Jale Gülen, Fatih Zorbay
  Carbonized peanut shell (CPS), a low cost adsorbent was investigated for adsorption of methylene blue from its aqueous solution. Some experimental parameters like the effect of initial dye concentration, initial solution pH, phases contact time and temperature were investigated. Langmuir, Freundlich and Harkins-Jura isotherm models were applied to the experimental data and Langmuir model fitted best. Monolayer adsorption capacity was 5.34 mg/g according to the Langmuir model. Adsorption capacity/uptake of CPS was found comparable to the some other adsorbent materials...
September 1, 2017: Water Environment Research: a Research Publication of the Water Environment Federation
https://www.readbyqxmd.com/read/28855016/removal-of-an-acid-dye-from-water-using-calcined-and-uncalcined-znal-r-anionic-clay
#18
Hassiba Bessaha, Mohamed Bouraada, Louis Charles de Ménorval
  The present report describes the removal of indigo carmine dye from water via adsorption on ZnAl-r hydrotalcite. Two grades of clay based on Zn/Al molar ratios of 3 and 4, uncalcined and calcined, were used. The adsorbents characterization using X-ray diffraction (XRD), Fourier transform infrared (FTIR), differential thermal and thermogravimetric analysis (DTA and TGA, respectively) revealed a layered structure for the hydrotalcite clays, whereas their calcination favored the formation of ZnO and ZnAl2O4 mixed metal oxides...
September 1, 2017: Water Environment Research: a Research Publication of the Water Environment Federation
https://www.readbyqxmd.com/read/28855015/optimization-of-fe-2-removal-from-coal-mine-wastewater-using-activated-biochar-of-colocasia-esculenta
#19
Soumya Banerjee, Augustine LaminKa-Ot, S R Joshi, Tamal Mandal, Gopinath Halder
  The present study investigates the sorptive removal of Fe2+ from simulated coal mine waste water using steam activated biochar (SABC) developed from the roots of Colocasia esculenta. The process was optimized by response surface methodology (RSM) under the influence of pH, temperature, adsorbent dosage and contact time at a constant shaking speed of 180 rpm with an initial concentration of 3 mg/L. The uptake performance of the biosorbent was assessed following a 24 full factorial experimental matrix developed by central composite design approach...
September 1, 2017: Water Environment Research: a Research Publication of the Water Environment Federation
https://www.readbyqxmd.com/read/28855014/an-introduction-for-this-special-issue-on-adsorption
#20
Kari Fitzmorris Brisolara
No abstract text is available yet for this article.
September 1, 2017: Water Environment Research: a Research Publication of the Water Environment Federation
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