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

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https://www.readbyqxmd.com/read/29776461/thermal-structure-induced-biochemical-parameters-stratification-in-a-subtropical-dam-reservoir
#1
(no author information available yet)
Although stratification in deep lakes was well discussed, few studies pay attention to thermal structure as well as itsinfluences on stratification of biochemical parameters in subtropical lakes in mountainous cities. Here, we studied the depth profile of temperature and biochemical parameters in Longjing Lake,a subtropical reservoir in a mountainous city. The thermal stratification became strong during summer. Biochemical parameters were strongly associated with thermal structure. Stratification started at 2~6 m depth with substantial decrease of dissolved oxygen (DO), biochemical oxygen demand (BOD5), chlorophyll a (Chla) and pH, corresponding to increase of total nitrogen (TN), ammonium (NH4+), nitrite (NO2-), total inorganic nitrogen (TIN), total phosphorus (TP) and soluble reactive phosphorus (SRP) with depth, and the majority of biochemical parameters showed slight variations from 12 m downward...
May 18, 2018: Water Environment Research: a Research Publication of the Water Environment Federation
https://www.readbyqxmd.com/read/29776459/phycoremediation-of-municipal-wastewater-by-the-cold-adapted-microalga-monoraphidium-sp-dek19
#2
(no author information available yet)
Present municipal wastewater treatment technologies often require substantial energy inputs, and fail to completely remove nitrate and phosphate before discharging effluent. In contrast, utilizing the cold-adapted oleaginous microalga Monoraphidium sp. Dek 19 decreased levels of both these polluting ions to 0 mg/dl. Concurrent biomass production was greater at 10oC than at 22 oC, showing that phycoremediation occurred at low temperatures previously thought to be unsuitable for algal-based treatment. Algal growth with uptake of nitrate and phosphate required only short bursts of aeration to suspend cells and maintain CO2 supply for photosynthesis...
May 8, 2018: Water Environment Research: a Research Publication of the Water Environment Federation
https://www.readbyqxmd.com/read/29618407/enhanced-methane-yield-by-co-digestion-of-sewage-sludge-with-micro-algae-and-catering-waste-leachate
#3
(no author information available yet)
The co-digestion of different wastes is a promising concept to improve methane generation during anaerobic process. However, the anaerobic co-digestion of catering waste leachate with algal biomass and sewage sludge has not been studied to date. This work investigated the methane generation by the anaerobic co-digestion of different mixtures of catering waste leachate, micro-algal biomass, and sewage sludge. Co-digestion of waste mixture containing equal ratios of three substrates had 39.31% higher methane yield than anaerobic digestion of raw sludge...
April 4, 2018: Water Environment Research: a Research Publication of the Water Environment Federation
https://www.readbyqxmd.com/read/29519270/status-challenges-and-perspectives-of-mainstream-nitritation-anammox-for-wastewater-treatment
#4
(no author information available yet)
The nitritation-anammox process is an efficient and cost-effective approach for biological nitrogen removal, but its application in treating mainstream wastewater remains a great challenge. Mainstream nitritation-anammox processes could create opportunities for achieving energy self-sufficient or energy-generating wastewater treatment plants. Significant advancements have been achieved via pilot- and full-scale trials to overcome the major obstacles under mainstream conditions, such as repression of nitrite-oxidizing bacteria, limiting the overgrowth of denitrifiers, and effective selection and retention of ammonia-oxidizing bacteria and anammox bacteria...
March 8, 2018: Water Environment Research: a Research Publication of the Water Environment Federation
https://www.readbyqxmd.com/read/29519267/the-comparison-of-heterogeneous-homogeneous-crystallization-for-1-phosphate-recovery-from-biosolids
#5
(no author information available yet)
In this study, a fluidized bed reactor was used to compare heterogeneous and homogeneous 15 crystallization for recovering magnesium ammonia phosphate (MAP) from the dewatering filtrate at a municipal wastewater treatment plant.
March 1, 2018: Water Environment Research: a Research Publication of the Water Environment Federation
https://www.readbyqxmd.com/read/29789043/statistical-expos%C3%A3-of-a-multiple-compartment-anaerobic-reactor-treating-domestic-wastewater
#6
Andrew R Pfluger, Martha J Hahn, Amanda S Hering, Junko Munakata-Marr, Linda Figueroa
  Mainstream anaerobic treatment of domestic wastewater is a promising energy-generating treatment strategy; however, such reactors operated in colder regions are not well characterized. Performance data from a pilot-scale, multiple-compartment anaerobic reactor taken over 786 days were subjected to comprehensive statistical analyses. Results suggest that chemical oxygen demand (COD) was a poor proxy for organics in anaerobic systems as oxygen demand from dissolved inorganic material, dissolved methane, and colloidal material influence dissolved and particulate COD measurements...
June 1, 2018: Water Environment Research: a Research Publication of the Water Environment Federation
https://www.readbyqxmd.com/read/29789042/phytoplankton-functional-groups-variation-and-influencing-factors-in-a-shallow-temperate-lake
#7
Chang Tian, Daping Hao, Haiyan Pei, Martina A Doblin, Ying Ren, Jielin Wei, Yawei Feng
  The present study was carried out in Luoma Lake, a shallow lake in temperate eastern China. Based on a two-year study, the dynamics of phytoplankton functional groups and influencing factors were analyzed. A total of 178 taxa were identified and sorted into 20 codons, according to the phytoplankton functional group classification. In order to find the environmental factors driving phytoplankton variations, fifteen groups were analyzed in detail using redundancy analysis. Groups P (Fragilaria crotonensis), X2 (Chlamydomonas globosa, C...
June 1, 2018: Water Environment Research: a Research Publication of the Water Environment Federation
https://www.readbyqxmd.com/read/29789041/effect-of-water-quality-and-temperature-on-the-efficiency-of-two-kinds-of-hydrophilic-polymers-in-soil
#8
Davoud Khodadadi Dehkordi
  In this study, evaluation of two-superabsorbent effects, Super-AB-A-300 and Super-AB-A-200 in a sandy soil on the water retention capability and saturated hydraulic conductivity (Ks) at different water quality and soil temperature were done. The Super-AB-A-200 was less effective in water uptake than Super-AB-A-300. The efficiency of these polymers in water retention was negatively influenced by the water quality and temperature. The efficiency of these polymer treatments in water uptake reduced significantly (P < 0...
June 1, 2018: Water Environment Research: a Research Publication of the Water Environment Federation
https://www.readbyqxmd.com/read/29789040/adsorption-and-oxidation-of-as-iii-on-iron-hydro-oxides
#9
Zhixi Zhao, Ming Guan, Han Zeng, Ping Chen
  Iron (hydro)oxides, including poorly crystalline ferrihydrite and the more crystalline forms, hematite and magnetite, play an important role in the biogeochemical cycling of arsenic in aquatic environments. In this study, adsorption and oxidation experiments for As(III) were performed on ferrihydrite, hematite, and magnetite, respectively. The results showed that the three iron (hydro)oxides acted as a catalyst for the oxidation of As(III) in the presence of oxygen. The variation in the oxidation states of As(III) on iron (hydro)oxides were confirmed by X-ray Absorption Near-Edge Structure (XANES) spectra...
June 1, 2018: Water Environment Research: a Research Publication of the Water Environment Federation
https://www.readbyqxmd.com/read/29678217/of-c-liang-j-h-lei-water-environ-res-87-656-659-2015
#10
E J Behrman
No abstract text is available yet for this article.
May 1, 2018: Water Environment Research: a Research Publication of the Water Environment Federation
https://www.readbyqxmd.com/read/29678216/detection-and-evaluation-of-groundwater-in-siwa-oasis-egypt-using-hydrogeochemical-and-remote-sensing-data-analysis
#11
Hassan Safaa, Ismail Esam
  The present study aims to detect and evaluate the groundwater quality in Siwa Oasis using chemical and remote sensing data analysis. To carry out this goal, the data of Thermal Emission and Reflection Radiometer (ASTER) images have been used to discriminate the lithological rock units. ALOS radar remote sensing data with spatial resolution 12.5 m has been used to emphasize the predominant fault trends as well as detection of the buried structures. The chemical analysis of 39 groundwater samples was used to evaluate the suitability of groundwater for drinking and irrigation purposes by comparing those parameters with World Health Organization standards...
May 1, 2018: Water Environment Research: a Research Publication of the Water Environment Federation
https://www.readbyqxmd.com/read/29678215/ecotoxicological-analysis-of-acrylamide-using-a-microalga-as-an-indicator-organism
#12
Bárbara Werle Nunes, Keila Fernanda Hedlund, Maria Angelica Oliveira, Elvis Carissimi
  Aquatic ecosystems are very prone to contamination. The fast and accurate assessment of the toxicity of water is an important tool for environmental safety. The aim of this study was to assess the possible toxic effects of acrylamide on physiological parameters of the Chlorophyceae Desmodesmus quadricauda. Cells in exponential growth phase were exposed for 72 h to different concentrations of acrylamide. Light microscopy analysis documented cell density, number of cells per coenobia, cell dimensions, and biovolume; chlorophyll a concentration was also determined...
May 1, 2018: Water Environment Research: a Research Publication of the Water Environment Federation
https://www.readbyqxmd.com/read/29678214/a-critical-review-of-the-factors-affecting-modeling-oxygen-transfer-by-fine-pore-diffusers-in-activated-sludge
#13
Gustavo Andrés Baquero-Rodríguez, Jaime Andrés Lara-Borrero, Daniel Nolasco, Diego Rosso
  In this review, the factors affecting the transfer of oxygen in activated sludge processes using fine-pore diffusers for water resource recovery are critically discussed. In water resource recovery facilities, the energy required for aeration constitutes 50% to 80% of the total energy consumed by the plant. This critical review highlights the use of fine-pore diffuser aeration and emphasizes the significance of accounting for the following factors: diffuser aging and fouling, diffuser layout, diffuser type, selector benefits, local environmental conditions (temperature and atmospheric pressure), influent wastewater variability, dissolved oxygen control systems, and airflow rates...
May 1, 2018: Water Environment Research: a Research Publication of the Water Environment Federation
https://www.readbyqxmd.com/read/29678213/biosorption-of-heavy-metals-from-aqueous-solution-by-bacteria-isolated-from-contaminated-soil
#14
Pradeep Dhanwal, Anil Kumar, Shruti Dudeja, Hemlata Badgujar, Rohit Chauhan, Abhishek Kumar, Poonam Dhull, Vinod Chhokar, Vikas Beniwal
  This study was carried out to analyze the heavy metals biosorption potential of bacteria isolated from soil contaminated with electroplating industrial effluents. Bacterial isolates were screened for their multi-metal biosorption potential against copper, nickel, lead, and chromium. Bacterial isolate CU4A showed the maximum uptake of copper, nickel, lead, and chromium in aqueous solution, with a biosorption efficiency of 87.16 %, 79.62%, 84.92%, and 68.12%, respectively. The bacterial strain CU4A was identified as Bacillus cereus, following 16S rRNA gene sequence analysis...
May 1, 2018: Water Environment Research: a Research Publication of the Water Environment Federation
https://www.readbyqxmd.com/read/29678212/exploring-the-feasibility-of-adsorptive-removal-of-zno-nanoparticles-from-wastewater
#15
Tropita Piplai, Arun Kumar, Babu J Alappat
  This study tested the feasibility of adsorptive removal of ZnO nanoparticles using activated carbon from wastewater. The effects of pH (5, 6, 7, 8, and 9) and nanoparticle/activated carbon concentration ratios (10, 1, 0.1, 0.01, and 0.001) on the removal were studied in batch kinetic studies in both deionized water and wastewater. The adsorption capacity of activated carbon for ZnO nanoparticles were found to be 9.3 ± 0.8 mg/g (93% removal) and 8.2 ± 3.7 mg/g (85% removal) at 640 and 780 min in deionized and wastewater respectively at optimum conditions (pH 8; 10g/L activated carbon concentration, 100mg/L ZnO nanoparticle concentration)...
May 1, 2018: Water Environment Research: a Research Publication of the Water Environment Federation
https://www.readbyqxmd.com/read/29678211/effluent-treatment-technologies-in-the-iron-and-steel-industry-a-state-of-the-art-review
#16
Pallabi Das, Gautam C Mondal, Siddharth Singh, Abhay K Singh, Bably Prasad, Krishna K Singh
  Iron and steel industry is the principal driving force propelling economic and technological growth of a nation. However, since its inception this industry is associated with widespread environmental pollution and enormous water consumption. Different units of a steel plant discharge effluents loaded with toxic, hazardous pollutants, and unutilized components which necessitates mitigation. In this paper, pollutant removal efficiency, effluent volume product quality, and economic feasibility of existing treatments are studied vis-à-vis their merits, demerits, and innovations to access their shortcomings which can be overcome with new technology to identify future research directions...
May 1, 2018: Water Environment Research: a Research Publication of the Water Environment Federation
https://www.readbyqxmd.com/read/29678210/ammoniacal-nitrogen-stripping-from-landfill-leachate-at-open-horizontal-flow-reactors
#17
Valderi D Leite, Juliana M R Paredes, Tales A T de Sousa, Wilton S Lopes, José T de Sousa
  The ammonia nitrogen stripping process at open horizontal flow reactors was evaluated and is described in this paper. The ammonia came from landfill leachate. Superficial loads of 650 kgN-<inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="00387-ilm02.gif"/>.ha-1.day-1 (phase 1), 750 kgN-<inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="00387-ilm03.gif"/>.ha-1.day-1 (phase 2), and 850 kgN-<inline-graphic xmlns:xlink="http://www...
May 1, 2018: Water Environment Research: a Research Publication of the Water Environment Federation
https://www.readbyqxmd.com/read/29521623/thermal-degradation-of-long-chain-fatty-acids
#18
Peerawat Charuwat, Gregory Boardman, Charles Bott, John T Novak
  The thermal hydrolysis of saturated (C16:0 and C18:0) and unsaturated fatty acids (C16:1, C18:1, and C18:2) was investigated at 90 °C to 160 °C for 30 min and 8 h durations. Hydrolysis efficiencies were calculated based on mass yield (i.e., mg/g parent compound), which accounted for all C2-C24 by-products. Very little degradation (less than 1%) of long chain fatty acids (LCFAs) was observed from 30 min thermal hydrolysis. At 140 and 160 °C for 8 h, saturated fatty acids degraded uniformly to C2 to C14...
March 1, 2018: Water Environment Research: a Research Publication of the Water Environment Federation
https://www.readbyqxmd.com/read/29521622/liquid-gas-mass-transfer-of-volatile-substances-in-an-energy-dissipating-structure
#19
Natércia Matias, Filipa Ferreira, José Saldanha Matos, Asbjørn Haaning Nielsen, Jes Vollertsen
  Mass transfer of a range of volatile substances was studied under highly turbulent conditions. The applied setup mimicked drop structures, where the release of volatile organic carbons likely occurs at a high rate. The experiments covered several substances in a range of resistances from residing entirely in the liquid film to being fully in the gas film. The two-film theory yielded a good prediction of the whole measured range. This allowed the experimental validation of a method where two reference substances are applied, to determine the transfer of any other substance - independently of where its resistance to mass transfer resides...
March 1, 2018: Water Environment Research: a Research Publication of the Water Environment Federation
https://www.readbyqxmd.com/read/29521621/modeling-storm-influenced-suspended-particulate-matter-flocculation-using-a-tide-wave-combined-biomineral-model
#20
Peihung Chen, Jason C S Yu, Michael Fettweis
  Flocculation of suspended particulate matter (SPM) in marine and estuarine environments is a complex process that is influenced by physical, biological, and chemical mechanisms. The flocculation model of Maggi (2009) was adapted to simulate flocculation under various weather conditions and during different seasons. The adaptation incorporated the effect of tide-wave-combined turbulence on floc dynamics. The model was validated using in situ measurements of floc size and SPM concentration from the southern North Sea during both calm and storm conditions...
March 1, 2018: Water Environment Research: a Research Publication of the Water Environment Federation
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