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https://www.readbyqxmd.com/read/28651323/effect-of-cellulose-as-co-substrate-on-old-landfill-leachate-treatment-using-white-rot-fungi
#1
A Bardi, Q Yuan, G Siracusa, I Chicca, M Islam, F Spennati, V Tigini, S Di Gregorio, D B Levin, G Petroni, G Munz
Conventional wastewater treatment technologies are ineffective for remediation of old LandFill Leachate (LFL), and innovative approaches to achieve satisfactory removal of this recalcitrant fraction are needed. This study focused on old LFL treatment with a selected fungal strain, Bjerkandera adusta MUT 2295, through batch and continuous tests, using packed-bed bioreactors under non-sterile conditions. To optimize the process performance, diverse types of co-substrates were used, including milled cellulose from beverage cups waste material...
June 12, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28651319/utilization-of-rice-husks-functionalized-with-xanthates-as-cost-effective-biosorbents-for-optimal-cd-ii-removal-from-aqueous-solution-via-response-surface-methodology
#2
Jianhua Qu, Xianlin Meng, Hong You, Xiuqing Ye, Zhaolin Du
Pristine rice husk (RH), a kind of agricultural waste based biosorbent, was chemically modified by introducing sulfur-bearing groups with the CS2 treatment under caustic medium. Using response surface methodology (RSM), the interactive effects of three preparation variables on the cadmium uptake and material yield of xanthate-modified rick husk (RH-X) were investigated, and two quadratic regression models were developed to correlate the preparation parameters to the two responses. Through process optimization, the optimal RH-X was finally obtained under the optimum synthesis conditions (i...
June 13, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28651141/a-comparative-study-of-pilot-scale-bio-trickling-filters-with-counter-and-cross-current-flow-patterns-in-the-treatment-of-emissions-from-chemical-fibre-wastewater-treatment-plant
#3
Zhuhui Yang, Jia Liu, Jingyang Cao, Dinghe Sheng, Tingjian Cai, Jian Li
Two pilot-scale bio-trickling filters (BTFs) with counter-current and cross-current flow modes were constructed, and their performance tested, for purifying chemical fibre waste gas containing H2S, NH3 and VOCs with a maximum gas flow rate of 1008m(3)h(-1). The counter-current type of BTF presented with superior biodegradation results compared to the cross-current type: it could start up quickly, tolerated high transient shock loadings, and possessed an average contaminant removal efficiency higher than 90% with an empty bed residence time of 59s...
June 13, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28651134/effect-of-salt-type-and-concentration-on-the-growth-and-lipid-content-of-chlorella-vulgaris-in-synthetic-saline-wastewater-for-biofuel-production
#4
Jared Church, Jae-Hoon Hwang, Keug-Tae Kim, Rebecca McLean, You-Kwan Oh, Bora Nam, Jin Chul Joo, Woo Hyoung Lee
Microalgae can offer several benefits for wastewater treatment with their ability to produce large amounts of lipids for biofuel production and the high economic value of harvested biomass for biogas and fertilizer. This study found that salt concentration (∼45gL(-1)) had more of an effect than salt type on metabolisms of Chlorella vulgaris for wastewater treatment and biofuel production. Salinity stress decreased the algal growth rate in wastewater by 0.003day(-1)permScm(-1) and slightly reduced nutrient removal rates...
June 17, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28651084/treatment-of-food-waste-recycling-wastewater-using-anaerobic-ceramic-membrane-bioreactor-for-biogas-production-in-mainstream-treatment-process-of-domestic-wastewater
#5
Yeongmi Jeong, Slawomir W Hermanowicz, Chanhyuk Park
A bench-scale anaerobic membrane bioreactor (AnMBR) equipped with submerged flat-sheet ceramic membranes was operated at mesophilic conditions (30-35 °C) treating domestic wastewater (DWW) supplemented with food wasterecycling wastewater (FRW) to increase the organic loading rate (OLR) for better biogas production. Coupling ceramic membrane filtration with AnMBR treatment provides an alternative strategy for high organic wastewater treatment at short hydraulic retention times (HRTs) with the potential benefits of membrane fouling because they have a high hydrophilicity and more robust at extreme conditions...
June 19, 2017: Water Research
https://www.readbyqxmd.com/read/28651047/prioritization-of-contaminants-of-emerging-concern-in-wastewater-treatment-plant-discharges-using-chemical-gene-interactions-in-caged-fish
#6
Edward J Perkins, Tanwir Habib, Barbara L Escalon, Jenna E Cavallin, Linnea Thomas, Matthew Weberg, Megan N Hughes, Kathleen M Jensen, Michael D Kahl, Daniel L Villeneuve, Gerald T Ankley, Natalia Garcia-Reyero
We examined whether contaminants present in surface waters could be prioritized for further assessment by linking the presence of specific chemicals to gene expression changes in exposed fish. Fathead minnows were deployed in cages for 2, 4, or 8 days at three locations near two different wastewater treatment plant discharge sites in the Saint Louis Bay, Duluth, MN and one upstream reference site. The biological impact of 51 chemicals detected in the surface water of 133 targeted chemicals was determined using biochemical endpoints, exposure activity ratios for biological and estrogenic responses, known chemical:gene interactions from biological pathways and knowledge bases, and analysis of the co-variance of ovary gene expression with surface water chemistry...
June 26, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28650688/multidrug-resistant-enterobacteriaceae-in-lebanese-hospital-wastewater-implication-in-the-one-health-concept
#7
Ziad Daoud, Jina Farah, Elie S Salem, Khalil El Kfoury, Elias Dahdouh, Khalil Masri, Claude Afif, Roula M Abdel-Massih, Ghassan M Matar
Extended-spectrum beta-lactamases (ESBL) and carbapenemase-producing organisms pose severe problems for hospitalized patients. In the absence of efficient sanitation and sewage disposal, the risks for transmission of hospital organisms into the community are high. Our objectives were to study the occurrence and mechanisms of resistance of multidrug-resistant gram-negative bacilli in two Lebanese hospital sewage treatment plants. Wastewater samples were collected, filtered, and cultivated on MacConckey+cefotaxime agars...
June 26, 2017: Microbial Drug Resistance: MDR: Mechanisms, Epidemiology, and Disease
https://www.readbyqxmd.com/read/28650149/rplc-hilic-and-sfc-with-mass-spectrometry-polarity-extended-organic-molecule-screening-in-environmental-water-samples
#8
Stefan Bieber, Giorgia Greco, Sylvia Grosse, Thomas Letzel
Trace organic compounds are important in environmental analysis, because they impact water quality and introduce potential (eco)toxicological effects. Current analytical methods mostly rely on gas chromatography (GC) or reversed-phase liquid chromatography (RPLC) coupled with (tandem) mass spectrometry. However, neither method can easily separate very polar molecules. This study presents, two chromatographic separation strategies, a serial RPLC- hydrophilic interaction liquid chromatography (RPLC-HILIC) coupling and an analytical scale supercritical fluid chromatography (SFC) system, and validates their separation effectiveness as polarity-extended chromatographic methods for 274 environmentally relevant compounds...
June 26, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28649931/a-novel-approach-for-application-of-white-rot-fungi-in-wastewater-treatment-under-non-sterile-conditions-immobilization-of-fungi-on-sorghum
#9
Mostafa Zahmatkesh, Henri Spanjers, Jules B van Lier
In this study we tested a new approach to facilitate the application of white rot fungi (WRF) under non-sterile conditions, by introducing grain sorghum as carrier and sole carbon and nutrient source for WRF. To this end, Trametes versicolor was immobilized on sorghum, and its ability to remove humic acid (HA) from synthetic and real industrial wastewater was studied. HA removal was measured as colour reduction and also analysed via size exclusion chromatography (SEC). Under sterile conditions, 80% colour removal was achieved for both synthetic and real wastewater using immobilized WRF on sorghum, without adding any additional carbon or nutrient sources...
June 26, 2017: Environmental Technology
https://www.readbyqxmd.com/read/28649406/architecture-component-and-microbiome-of-biofilm-involved-in-the-fouling-of-membrane-bioreactors
#10
Tomohiro Inaba, Tomoyuki Hori, Hidenobu Aizawa, Atsushi Ogata, Hiroshi Habe
Biofilm formation on the filtration membrane and the subsequent clogging of membrane pores (called biofouling) is one of the most persistent problems in membrane bioreactors for wastewater treatment and reclamation. Here, we investigated the structure and microbiome of fouling-related biofilms in the membrane bioreactor using non-destructive confocal reflection microscopy and high-throughput Illumina sequencing of 16S rRNA genes. Direct confocal reflection microscopy indicated that the thin biofilms were formed and maintained regardless of the increasing transmembrane pressure, which is a common indicator of membrane fouling, at low organic-loading rates...
2017: NPJ Biofilms and Microbiomes
https://www.readbyqxmd.com/read/28649277/diversity-of-microbial-carbohydrate-active-enzymes-in-danish-anaerobic-digesters-fed-with-wastewater-treatment-sludge
#11
Casper Wilkens, Peter Kamp Busk, Bo Pilgaard, Wen-Jing Zhang, Kåre L Nielsen, Per Halkjær Nielsen, Lene Lange
BACKGROUND: Improved carbohydrate-active enzymes (CAZymes) are needed to fulfill the goal of producing food, feed, fuel, chemicals, and materials from biomass. Little is known about how the diverse microbial communities in anaerobic digesters (ADs) metabolize carbohydrates or which CAZymes that are present, making the ADs a unique niche to look for CAZymes that can potentiate the enzyme blends currently used in industry. RESULTS: Enzymatic assays showed that functional CAZymes were secreted into the AD environments in four full-scale mesophilic Danish ADs fed with primary and surplus sludge from municipal wastewater treatment plants...
2017: Biotechnology for Biofuels
https://www.readbyqxmd.com/read/28648748/optimized-anaerobic-aerobic-sequential-system-for-the-treatment-of-food-waste-and-wastewater
#12
S Ghanimeh, C Abou Khalil, C Bou Mosleh, C Habchi
Considering that modern wastewater and solid waste processing facilities seek efficient energy recovery methods, this study investigates anaerobic-aerobic sequential systems for combined treatment of raw wastewater with food waste. The optimum loading rate was found to be 1.6mgVSL(-1)d(-1) resulting in a stable operation of the anaerobic compartment. Yet, the increase in ammonia concentration resulted in gradual accumulation of VFA, until reaching a tipping point of 3000mgL(-1) beyond which an abrupt increase in VFA to above 6000mgL(-1) was observed, with acute stability loss and performance deterioration...
June 22, 2017: Waste Management
https://www.readbyqxmd.com/read/28648180/kinetic-study-on-anaerobic-oxidation-of-methane-coupled-to-denitrification
#13
Hou Yu, Hiroyuki Kashima, John M Regan, Abid Hussain, Elsayed Elbeshbishy, Hyung-Sool Lee
Monod kinetic parameters provide information required for kinetic analysis of anaerobic oxidation of methane coupled to denitrification (AOM-D). This information is critical for engineering AOM-D processes in wastewater treatment facilities. We first experimentally determined Monod kinetic parameters for an AOM-D enriched culture and obtained the following values: maximum specific growth rate (μmax) 0.121/d, maximum substrate-utilization rate (qmax) 28.8mmol CH4/g cells-d, half maximum-rate substrate concentration (Ks) 83μΜ CH4, growth yield (Y) 4...
September 2017: Enzyme and Microbial Technology
https://www.readbyqxmd.com/read/28647903/farmers-attitude-toward-treated-sludge-use-in-the-villages-of-west-bank-palestine
#14
Md M Rashid, Mary G Kattou'a, Issam A Al-Khatib, Chikashi Sato
An application of treated sewage sludge on agricultural land has been widely accepted, as this method is simple and economical for disposal of wastewater residues. When applied properly on an agricultural land, sludge can replenish organic matter and nutrients in soil. Although sewage sludge has been used in agriculture in many parts of the world, its acceptability varies with different cultures and beliefs among farmers. Farmers' concerns on sludge use are primarily due to its anthropogenic origin, pollutants that it carries, a general perception of sewage being dirty, and its offensive odor...
July 2017: Environmental Monitoring and Assessment
https://www.readbyqxmd.com/read/28647256/bioavailability-of-wastewater-derived-dissolved-organic-nitrogen-to-green-microalgae-selenastrum-capricornutum-chlamydomonas-reinhardtii-and-chlorella-vulgaris-with-without-presence-of-bacteria
#15
Jingyi Sun, Halis Simsek
Effluent dissolved organic nitrogen (DON) is problematic in nutrient sensitive surface waters and needs to be reduced to meet demanding total dissolved nitrogen discharge limits. Bioavailable DON (ABDON) is a portion of DON utilized by algae or algae+bacteria, while biodegradable DON (BDON) is a portion of DON decomposable by bacteria. ABDON and BDON in a two-stage trickling filter (TF) wastewater treatment plant was evaluated using three different microalgal species, Selenastrum capricornutum, Chlamydomonas reinhardtii and Chlorella vulgaris and mixed cultured bacteria...
July 2017: Journal of Environmental Sciences (China)
https://www.readbyqxmd.com/read/28647250/constructed-wetlands-for-wastewater-treatment-in-cold-climate-a-review
#16
REVIEW
Mo Wang, Dong Qing Zhang, Jian Wen Dong, Soon Keat Tan
Constructed wetlands (CWs) have been successfully used for treating various wastewaters for decades and have been identified as a sustainable wastewater management option worldwide. However, the application of CW for wastewater treatment in frigid climate presents special challenges. Wetland treatment of wastewater relies largely on biological processes, and reliable treatment is often a function of climate conditions. To date, the rate of adoption of wetland technology for wastewater treatment in cold regions has been slow and there are relatively few published reports on CW applications in cold climate...
July 2017: Journal of Environmental Sciences (China)
https://www.readbyqxmd.com/read/28647246/environmentally-relevant-concentrations-of-aminopolycarboxylate-chelating-agents-mobilize-cd-from-humic-acid
#17
Ashley E North, Sophia Sarpong-Kumankomah, Andrew R Bellavie, Wade M White, Jürgen Gailer
Although Cd is a pollutant of public health relevance, many dietary sources from which it can be absorbed into human tissues remain unknown. While it is well established that the biogeochemical cycle of Cd involves its complexation with environment-derived ligands (e.g., humic acids, HAs) and anthropogenic ones (e.g., chelating agents, CAs), the interaction of Cd with both of these ligands is less well understood. To gain insight, a HA-Cd complex was injected on a size-exclusion chromatography (SEC) column coupled on-line with a flame atomic absorption spectrometer (FAAS) using 10mmol/L Tris buffer (pH8...
July 2017: Journal of Environmental Sciences (China)
https://www.readbyqxmd.com/read/28647236/hydrolysis-of-polyaluminum-chloride-prior-to-coagulation-effects-on-coagulation-behavior-and-implications-for-improving-coagulation-performance
#18
Zhongguo Zhang, Jun Wang, Dan Liu, Jiuyi Li, Xiaolin Wang, Boyu Song, Bing Yue, Kehui Zhao, Yun Song
The effects of polyaluminum chloride (PACl) hydrolysis prior to coagulation on both the coagulation zone and coagulation performance of a kaolin suspension were investigated by a novel jar test named the "reversed coagulation test". The tests showed that PACl hydrolysis prior to coagulation decreased the performance of charge neutralization coagulation in the case of short-time slow mixing (10min; G=15sec(-1)) and increased the optimal dosage for charge neutralization and sweep coagulation. Moreover, the hydrolysis time had insignificant effects on the size and zeta potential of PACl precipitates and the residual turbidity of the raw water...
July 2017: Journal of Environmental Sciences (China)
https://www.readbyqxmd.com/read/28647235/selective-elimination-of-chromophoric-and-fluorescent-dissolved-organic-matter-in-a-full-scale-municipal-wastewater-treatment-plant
#19
Xiaofang Yang, Zhongbo Zhou, Maddela Naga Raju, Xiaoxuan Cai, Fangang Meng
Effluent organic matter (EfOM) from municipal wastewater treatment plants potentially has a detrimental effect on both aquatic organisms and humans. This study evaluated the removal and transformation of chromophoric dissolved organic matter (CDOM) and fluorescent dissolved organic matter (FDOM) in a full-scale wastewater treatment plant under different seasons. The results showed that bio-treatment was found to be more efficient in removing bulk DOM (in term of dissolved organic carbon, DOC) than CDOM and FDOM, which was contrary to the disinfection process...
July 2017: Journal of Environmental Sciences (China)
https://www.readbyqxmd.com/read/28646435/eco-friendly-synthesis-of-silver-nanoparticles-using-green-algae-caulerpa-serrulata-reaction-optimization-catalytic-and-antibacterial-activities
#20
Eman F Aboelfetoh, Rania A El-Shenody, Mohamed M Ghobara
Stable colloidal silver nanoparticles (AgNPs) were synthesized using Caulerpa serrulata (green marine algae) aqueous extract as an efficient reducing and stabilizing agent. This method is considered to be a sustainable alternate to the more complicated chemical procedures. To achieve the optimization synthesis of AgNPs, several effects such as extract concentration, contact time, pH values, and temperature were examined. The synthesized AgNPs were characterized by UV-Vis spectroscopy, FT-IR, XRD, and HR-TEM...
July 2017: Environmental Monitoring and Assessment
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