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https://www.readbyqxmd.com/read/29786429/development-of-a-nanostructured-%C3%AE-mno2-carbon-paper-composite-for-removal-of-ni2-mn2-ions-by-electrosorption
#1
Pengju Li, Yang Gui, Daniel John Blackwood
Toxic metal ions, such as Ni2+ and Mn2+, in industrial waste streams are non-biodegradable and can cause damage to the human body. Electrochemical cleaning techniques are attractive as they offer more control and produce less sludge than chemical / biological approaches without the high pressures needed for membranes. Here nanoneedle structured α-MnO2/carbon fiber paper (CFP) composites were synthesized by a hydrothermal approach and used as electrodes for combined electro-adsorption and capacitive deionization removal of nickel and manganese ions from pseudo industrial waste streams...
May 22, 2018: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29785600/performance-and-microbial-community-of-cic-anaerobic-reactor-treating-food-waste-under-different-grease-contents-and-inner-circulation-ratio
#2
Chengyuan Su, Lijian Zhao, Liming Liao, Jingjing Qin, Yuxiang Lu, Menglin Chen, Mei Huang, Zhi Huang
High concentrations of grease easily inhibit anaerobic digestion. The stability of the process and microbial responses in the controlling internal circulation (CIC) reactor used for treating food waste were investigated under different grease contents and inner circulation ratios. Results showed that at the grease content of 1 g/L, the removal rates of 94% and 86-93% were achieved for chemical oxygen demand (COD) and NH3 -N, respectively. In contrast, when the grease content increased to 7 g/L, removal rates for COD and NH3 -N significantly decreased to 42...
May 21, 2018: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/29785598/a-case-study-on-the-occurrence-transport-and-fate-of-mercury-species-in-a-sewage-treatment-plant-in-jiaozuo-china
#3
Hao Liu, Ying Cui, Hua Li, Yuxiang Mao
Occurrence and fate of sewage- and sludge-borne total mercury (THg) and methylmercury (MeHg) have received little attention, although they might be an important component of the global Hg inventory. To address the knowledge gap, sewage and sewage sludge (SS) samples were collected from a secondary municipal sewage treatment plant (MSTP) located in Jiaozuo, China. Total Hg in the raw sewage varied between 95.3 ng/L and 1.2 × 103  ng/L, while MeHg occurred in the sewage within ranges of 2.7-21.3 ng/L...
May 21, 2018: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/29785219/assessing-methanogenic-archaeal-community-in-full-scale-anaerobic-sludge-digester-systems-in-dubai-united-arab-emirates
#4
Munawwar A Khan, Poojabahen G Patel, Arpitha G Ganesh, Naushad Rais, Sultan M Faheem, Shams T Khan
Introduction: Anaerobic digestion for methane production comprises of an exceptionally diverse microbial consortium, a profound understanding about which is still constrained. In this study, the methanogenic archaeal communities in three full-scale anaerobic digesters of a Municipal Wastewater Treatment Plant were analyzed by Fluorescence in situ hybridization and quantitative real-time Polymerase Chain Reaction (qPCR) technique. Methods & Materials: Fluorescence in situ hybridization (FISH) was performed to detect and quantify the methanogenic Archaea in the sludge samples whereas qPCR was carried out to support the FISH analysis...
2018: Open Microbiology Journal
https://www.readbyqxmd.com/read/29784394/multiresidue-analytical-method-for-pharmaceuticals-and-personal-care-products-in-sewage-and-sewage-sludge-by-online-direct-immersion-spme-on-fiber-derivatization-gcms
#5
Rebeca López-Serna, David Marín-de-Jesús, Rubén Irusta-Mata, Pedro Antonio García-Encina, Raquel Lebrero, María Fdez-Polanco, Raúl Muñoz
The work here presented aimed at developing an analytical method for the simultaneous determination of 22 pharmaceuticals and personal care products, including 3 transformation products, in sewage and sludge. A meticulous method optimization, involving an experimental design, was carried out. The developed method was fully automated and consisted of the online extraction of 17 mL of water sample by Direct Immersion Solid Phase MicroExtraction followed by On-fiber Derivatization coupled to Gas Chromatography - Mass Spectrometry (DI-SPME - On-fiber Derivatization - GC - MS)...
August 15, 2018: Talanta
https://www.readbyqxmd.com/read/29783194/quantitative-investigation-of-hydraulic-mixing-energy-input-during-batch-mode-anaerobic-digestion-and-its-impact-on-performance
#6
James McLeod, Z Othman, Rajarathinam Parthasarathy
The relationship between mixing energy input and biogas production was investigated by anaerobically digesting sewage sludge in lab scale, hydraulically mixed, batch mode digesters at six different specific energy inputs. The goal was to identify how mixing energy influenced digestion performance at quantitative levels to help explain the varying results in other published works. The results showed that digester homogeneity was largely uninfluenced by energy input, whereas cumulative biogas production and solids destruction were...
May 18, 2018: Bioresource Technology
https://www.readbyqxmd.com/read/29783193/quorum-sensing-molecules-in-activated-sludge-could-trigger-microalgae-lipid-synthesis
#7
Chaofan Zhang, Qingcheng Li, Liang Fu, Dandan Zhou, John C Crittenden
Cultivating microalgae using wastewater is an economical strategy to produce biofuel; however, microbial contamination has to be controlled strictly. Microalgae lipid accumulation can be triggered by environmental pressures, and here, we studied whether microbial contamination is the pressure for microalgae. We hypothesized this pressure was forced via cell-to-cell communication with quorum sensing molecules (QSMs). In this work, we verified the impacts of QSMs produced by activated sludge (wastewater-born microbial consortiums) on both lipid content and biomass production of the microalgae Chlorophyta sp...
May 18, 2018: Bioresource Technology
https://www.readbyqxmd.com/read/29783166/in-situ-sludge-reduction-and-carbon-reuse-in-an-anoxic-oxic-process-coupled-with-hydrocyclone-breakage
#8
Yinxiang Xu, Yuanyuan Fang, Zhenhua Wang, Dan Guo, Yi Liu, Yuan Huang, Pengbo Fu, Juehui Jin, Chenwen Wei, Hualin Wang, Tao Zeng
The long-term performance of an anoxic-oxic-hydrocyclone (AOH) process with an in-situ hydrocyclone treatment unit in the mixed liquid return line for sludge reduction and carbon reuse has been observed, in comparison with a conventional anoxic-oxic (AO) process. Three parallel side-stream systems, including one AOH25 system with a 25-mm hydrocyclone, one AOH35 system with a 35-mm hydrocyclone and one AO system, were built and fed with real wastewater for a comparative study in a wastewater treatment plant...
May 9, 2018: Water Research
https://www.readbyqxmd.com/read/29783153/microwave-assisted-pyrolysis-of-textile-dyeing-sludge-and-migration-and-distribution-of-heavy-metals
#9
Hedong Zhang, Zuopeng Gao, Yang Liu, Chunmei Ran, Xiao Mao, Qinhao Kang, Wenya Ao, Jie Fu, Jing Li, Guangqing Liu, Jianjun Dai
This study investigated the pyrolysis characteristic of textile dyeing sludge (DS) using an auger pyrolyser under microwave irradiation at different pyrolysis temperature. The migration and distribution characteristic of heavy metals and their potential ecological risks were investigated using inductively coupled plasma mass spectrometry (ICP-MS) techniques. Temperature and additives (e.g. Ca-bentonite, kaolin and CaO) significantly affected product distribution and yields. Heavy metals showed different enrichment characteristics during pyrolysis and a great percentage of the heavy metals was retained in the sludge char (SC), depending on different temperatures and additives...
May 1, 2018: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/29783142/assessment-of-microbial-products-in-the-biosorption-process-of-cu-ii-onto-aerobic-granular-sludge-extracellular-polymeric-substances-contribution-and-soluble-microbial-products-release
#10
Linxian Huang, Meilin Li, Guangchao Si, Jinglin Wei, Huu Hao Ngo, Wenshan Guo, Weiying Xu, Bin Du, Qin Wei, Dong Wei
In the present study, the responses of microbial products in the biosorption process of Cu(II) onto aerobic granular sludge were evaluated by using batch and spectroscopic approaches. Batch experimental data showed that extracellular polymeric substances (EPSs) contributed to Cu(II) removal from an aqueous solution, especially when treating low metal concentrations, whereas soluble microbial products (SMPs) were released under the metal stress during biosorption process. A three-dimensional excitation-emission matrix (3D-EEM) identified four main fluorescence peaks in the EPS, i...
May 18, 2018: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/29782790/magnetite-triggering-enhanced-diet-a-scavenger-for-the-blockage-of-electron-transfer-in-anaerobic-digestion-of-high-solids-sewage-sludge
#11
Tao Wang, Dong Zhang, Lingling Dai, Bin Dong, Xiaohu Dai
At present, high-solids anaerobic digestion of sewage sludge has drawn great attention due to the superiority of its small land area footprint and low energy consumption. However, a high organic loading rate may cause acids accumulation and ammonia inhibition, thus leading to an inhibited pseudo-steady state in which electron transfer through interspecies hydrogen transfer (IHT) between acetogens and methanogens is blocked. In this study, adding 50 mg/g TS (total solid) magnetite clearly reduced the accumulation of short-chain fatty acids and accelerated methane production by 26...
May 21, 2018: Environmental Science & Technology
https://www.readbyqxmd.com/read/29779225/soil-transmitted-helminth-infections-associated-with-wastewater-and-sludge-reuse-a-review-of-current-evidence
#12
REVIEW
Isaac Dennis Amoah, Anthony Ayodeji Adegoke, Thor Axel Stenström
OBJECTIVE: To review current evidence on infections related to the concentration of soil-transmitted helminth (STH) eggs in wastewater, sludge and vegetables irrigated with wastewater or grown on sludge-amended soils. METHOD: Search of Web of Science, Science Direct, PubMed and Google Scholar databases for publications reporting on STH egg concentration in wastewater, sludge and vegetables and for epidemiological studies on wastewater/sludge reuse and STH infections...
May 19, 2018: Tropical Medicine & International Health: TM & IH
https://www.readbyqxmd.com/read/29778686/methane-correction-factors-for-estimating-emissions-from-aerobic-wastewater-treatment-facilities-based-on-field-data-in-mexico-and-on-literature-review
#13
A Noyola, M G Paredes, L P Güereca, L T Molina, M Zavala
Wastewater treatment (WWT) may be an important source of methane (CH4 ), a greenhouse gas with significant global warming potential. Sources of CH4 emissions from WWT facilities can be found in the water and in the sludge process lines. Among the methodologies for estimating CH4 emissions inventories from WWT, the more adopted are the guidelines of the Intergovernmental Panel on Climate Change (IPCC), which recommends default emission factors (Tier 1) depending on WWT systems. Recent published results show that well managed treatment facilities may emit CH4 , due to dissolved CH4 in the influent wastewater; in addition, biological nutrient removal also will produce this gas in the anaerobic (or anoxic) steps...
May 17, 2018: Science of the Total Environment
https://www.readbyqxmd.com/read/29778653/survival-and-phosphate-solubilisation-activity-of-desiccated-formulations-of-penicillium-bilaiae-and-aspergillus-niger-influenced-by-water-activity
#14
Nelly Sophie Raymond, Dorette Müller Stöver, Lars Stoumann Jensen, Sebastian Håkansson
The impact of formulation and desiccation on the shelf life of phosphate (P)-solubilising microorganisms is often under-studied, particularly relating to their ability to recover P-solubilisation activity. Here, Penicilllium bilaiae and Aspergillus niger were formulated on vermiculite (V) alone, or with the addition of protectants (skimmed milk (V + SM) and trehalose (V + T)), and on sewage sludge ash with (A + N) and without nutrients (A), and dried in a convective air dryer. After drying, the spore viability of P...
May 17, 2018: Journal of Microbiological Methods
https://www.readbyqxmd.com/read/29778405/anaerobic-co-digestion-of-different-wastes-in-a-uasb-reactor
#15
Khushboo Kumari, S Suresh, S Arisutha, K Sudhakar
Anaerobic co-digestion has made a greater impact on the biogas production from mixing different type of waste. In this research, sewage sludge (SS) and cow manure (CM), was used as a primary waste along with kitchen waste (KW), yard waste (YW), floral waste (FW) and dairy wastewater (DWW) as co-substrate for anaerobic digestion. Mixtures with a ratio of 1:2 ratio is fed into a single stage up-flow anaerobic sludge blanket (UASB) reactor. Digestion was carried out in a mesophilic temperature range for 20 days...
May 16, 2018: Waste Management
https://www.readbyqxmd.com/read/29778175/an-innovative-approach-to-minimize-excess-sludge-production-in-sewage-treatment-using-integrated-bioreactors
#16
Mahesh Mannacharaju, Prabhakaran Natarajan, Arivizhivendhan Kannan Villalan, Madasamy Jothieswari, Swarnalatha Somasundaram, Sekaran Ganesan
The present investigation deals with an application of integrated sequential oxic and anoxic bioreactor (SOABR) and fluidized immobilized cell carbon oxidation (FICCO) reactor for the treatment of domestic wastewater with minimum sludge generation. The performance of integrated SOABR-FICCO system was evaluated on treating the domestic wastewater at hydraulic retention time (HRT) of 3hr and 6hr for 120days at organic loading rate (OLR) of 191±31mg/(L·hr). The influent wastewater was characterized by chemical oxygen demand (COD) 573±93mg/L; biochemical oxygen demand (BOD5 ) 197±35mg/L and total suspended solids (TSS) 450±136mg/L...
May 2018: Journal of Environmental Sciences (China)
https://www.readbyqxmd.com/read/29778171/combined-zero-valent-iron-and-hydrogen-peroxide-conditioning-significantly-enhances-the-dewaterability-of-anaerobic-digestate
#17
Qilin Wang, Jing Sun, Kang Song, Xu Zhou, Wei Wei, Dongbo Wang, Guo-Jun Xie, Yanyan Gong, Beibei Zhou
The importance of enhancing sludge dewaterability is increasing due to the considerable impact of excess sludge volume on disposal costs and on overall sludge management. This study presents an innovative approach to enhance dewaterability of anaerobic digestate (AD) harvested from a wastewater treatment plant. The combination of zero valent iron (ZVI, 0-4.0g/g total solids (TS)) and hydrogen peroxide (HP, 0-90mg/g TS) under pH3.0 significantly enhanced the AD dewaterability. The largest enhancement of AD dewaterability was achieved at 18mg HP/g TS and 2...
May 2018: Journal of Environmental Sciences (China)
https://www.readbyqxmd.com/read/29778158/community-structures-and-population-dynamics-of-candidatus-accumulibacter-in-activated-sludges-of-wastewater-treatment-plants-using-ppk1-as-phylogenetic-marker
#18
Wei Zeng, Limin Zhang, Pengchao Fan, Jingjing Guo, Yongzhen Peng
Candidatus Accumulibacter has been identified as dominant polyphosphate-accumulating organisms (PAOs) in enhanced biological phosphorus (P) removal (EBPR) from wastewater. This study revealed the relevance of community structure, abundance and seasonal population dynamics of Candidatus Accumulibacter to process operation of wastewater treatment plants (WWTPs) in China using ppk1 gene as phylogenetic marker. All sludge samples had properties of denitrifying P removal using nitrate as an electron acceptor. Accumulibacter abundance in the anaerobic-anoxic-oxic (A2 O) process was the highest (26% of total bacteria), and higher in winter than in summer with a better EBPR performance...
May 2018: Journal of Environmental Sciences (China)
https://www.readbyqxmd.com/read/29778155/effect-of-phosphate-releasing-in-activated-sludge-on-phosphorus-removal-from-municipal-wastewater
#19
Jie Ge, Xiaoguang Meng, Yonghui Song, Amalia Terracciano
Aluminum and ferric salts are commonly used in municipal wastewater treatment plants (WWPTs) for phosphorus (P) removal. In this study, on-site jar tests were conducted to determine the removal of different P species from the fresh samples in the presence and absence of activated sludge (AS) with different doses of alum, poly-aluminum chloride, and ferric chloride at different pH. The soluble P (SP) concentration in the samples was about 0.63mg/L. When the mixed liquor containing AS was treated with 8mg/L of Al, SP could be reduced to 0...
May 2018: Journal of Environmental Sciences (China)
https://www.readbyqxmd.com/read/29778148/qualitatively-and-quantitatively-assessing-the-aggregation-ability-of-sludge-during-aerobic-granulation-process-combined-xdlvo-theory-with-physicochemical-properties
#20
Shasha Yuan, Mingming Gao, Hui Ma, Muhammad Zaheer Afzal, Yun-Kun Wang, Mingyu Wang, Hai Xu, Shu-Guang Wang, Xin-Hua Wang
Inexact mechanism of aerobic granulation still impedes optimization and application of aerobic granules. In this study, the extended Derjaguin, Landau, Verwey, and Overbeek (XDLVO) theory and physicochemical properties were combined to assess the aggregation ability of sludge during aerobic granulation process qualitatively and quantitatively. Results show that relative hydrophobicity of sludge and polysaccharide content of extracellular polymeric substances (EPS) increased, while electronegativity of sludge decreased during acclimation phase...
May 2018: Journal of Environmental Sciences (China)
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