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https://www.readbyqxmd.com/read/28092731/biological-removal-of-selenate-and-ammonium-by-activated-sludge-in-a-sequencing-batch-reactor
#1
J Mal, Y V Nancharaiah, E D van Hullebusch, P N L Lens
Wastewaters contaminated by both selenium and ammonium need to be treated prior to discharge into natural water bodies, but there are no studies on the simultaneous removal of selenium and ammonium. A sequencing batch reactor (SBR) was inoculated with activated sludge and operated for 90days. The highest ammonium removal efficiency achieved was 98%, while the total nitrogen removal was 75%. Nearly a complete chemical oxygen demand removal efficiency was attained after 16days of operation, whereas complete selenate removal was achieved only after 66days...
January 3, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28092008/spatio-temporal-variation-of-septage-characteristics-of-a-semi-arid-metropolitan-city-in-a-developing-country
#2
D Krithika, Anu Rachel Thomas, Gomathy R Iyer, Martin Kranert, Ligy Philip
Septage is the solid sludge that accumulates in septic tanks over a period of time. Many of the developing countries in the world face the challenging task of septage management. Due to the high variability in the nature of septage, there is a need to study its physical and chemical characteristics in order to suggest a sustainable treatment methodology. The present study deals with the characterization of septage collected from different locations of Chennai city in India, in two different seasons (summer and winter)...
January 16, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28091530/the-autofluorescence-characteristics-of-bacterial-intracellular-and-extracellular-substances-during-the-operation-of-anammox-reactor
#3
Xiaolin Hou, Sitong Liu, Ying Feng
Anammox is a cost-effective process to treat nitrogenous wastewater. In this work, excitation-emission matrix (EEM) fluorescence spectroscopy was used to characterize the intracellular and extracellular substances of anammox sludge during reactor operation of 276 days. Four main fluorophores were identified from the intracellular substances. Two main protein-like fluorophores were identified from the extracellular substances. Correlation analysis revealed that intracellular 420 peak and humic-like peak had strong correlation with nitrogen removal rate...
January 16, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28090475/use-of-omega-3-polyunsaturated-fatty-acids-to-treat-inspissated-bile-syndrome-a-case-report
#4
Woo Young Jun, Min Jeng Cho, Hye Seung Han, Sun Hwan Bae
Inspissated bile syndrome (IBS) is a rare condition in which thick intraluminal bile, including bile plugs, sludge, or stones, blocks the extrahepatic bile ducts in an infant. A 5-week-old female infant was admitted for evaluation of jaundice and acholic stool. Diagnostic tests, including ultrasound sonography, magnetic resonance cholangiopancreatography, and a hepatobiliary scan, were not conclusive. Although the diagnosis was unclear, the clinical and laboratory findings improved gradually on administration of urodeoxycholic acid and lipid emulsion containing omega-3 polyunsaturated fatty acids (PUFAs) for 3 weeks...
December 2016: Pediatric Gastroenterology, Hepatology & Nutrition
https://www.readbyqxmd.com/read/28089401/recycling-organic-wastes-to-agricultural-land-as-a-way-to-improve-its-quality-a-field-study-to-evaluate-benefits-and-risks
#5
P Alvarenga, P Palma, C Mourinha, M Farto, J Dôres, M Patanita, C Cunha-Queda, T Natal-da-Luz, M Renaud, J P Sousa
A field study was established to assess the effects of a sewage sludge (SS), a mixed municipal solid waste compost (MMSWC) and a compost produced from agricultural wastes (AWC), in a Vertisol, using Lolium multiflorum L. The amendments were applied for two consecutive years: 6, 12 and 24t dry matter ha(-1) for SS, and the amendment doses for MMSWC and AWC were calculated to deliver the same amount of organic matter (OM) per unit area. The amendments had significant beneficial effects on some soil properties (e...
January 12, 2017: Waste Management
https://www.readbyqxmd.com/read/28088542/interaction-of-earthworms-microbe-facilitating-biofilm-dewaterability-performance-during-wasted-activated-sludge-reduction-and-stabilization
#6
Yadan Zheng, Meiyan Xing, Luziyu Cai, Tao Xiao, Yufan Lu, Jinzhou Jiang
Sludge dewaterability was chemically and morphologically explored during sewage sludge treatment by vermifiltration. The results, with a conventional biofilter (BF, no earthworms) as a control, demonstrated that the capillary suction time(CST) and specific resistance of filtration(SRF) of vermifilter (VF, with earthworms) treated sludge were 64.9±1.7s and (23.1±1.3)×10(12)m/kg,16.8% and 36.0% lower than that of the BF, respectively. Additionally, the VF could efficiently decompose loosely bound extracellular polymeric substances (LB-EPS), releasing more water trapped inside biofilm...
January 11, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28088532/comparison-of-an-anaerobic-feed-and-split-anaerobic-aerobic-feed-on-granular-sludge-development-performance-and-ecology
#7
Benjamin J Thwaites, Petra Reeve, Nirmala Dinesh, Michael D Short, Ben van den Akker
The retrofitting of existing wastewater sequencing batch reactors (SBRs) to select for rapid-settling aerobic granular sludge (AGS) over floc-based conventional activated sludge (CAS), could be a viable option to decrease reactor cycle time and increase hydraulic capacity. Successful CAS-to-AGS conversion has previously been shown to be highly dependent on having a dedicated anaerobic feed, which presents additional engineering challenges when retrofitting SBRs. In this study we compared the performance of a split anaerobic-aerobic (An-Aer) feed with that of a traditional dedicated anaerobic feed regarding AGS formation and stability, nitrogen removal performance and microbial ecology...
December 29, 2016: Chemosphere
https://www.readbyqxmd.com/read/28087923/enhanced-aerobic-sludge-granulation-by-seeding-concentrated-activated-sludge-with-ca-alginate-gel
#8
Can Sun
The present study focuses on the effect of Ca-alginate gel on aerobic sludge granulation. Three sequencing batch reactors (SBRs) seeded with different mixtures of Ca-alginate gel and activated sludge with the fraction (weight/weight of dry biomass) of 0%, 5.5% and 15.5% respectively. The granulation time of 14 days was obtained with 5.5% additive, whilst 32 days were needed to adapt aerobic granules developed with 0% Ca-alginate gel. Full granulation was achieved in the trial with 15.5% additive from the 20th day...
December 9, 2016: Water Environment Research: a Research Publication of the Water Environment Federation
https://www.readbyqxmd.com/read/28087921/pathogen-characterization-of-fresh-and-stored-mesophilic-anaerobically-digested-biosolids
#9
Cecily A
Culturable bacterial pathogens (Campylobacter, Salmonella, Listeria, Yersinia) and indicators (E. coli, enterococci, Clostridium perfringens) were quantified at six wastewater treatment plants that land apply anaerobically digested biosolids in Ontario, Canada. Cryptosporidium parvum and Giardia lamblia were also quantified by PCR. Salmonella and Listeria were frequently detected in sludge and liquid biosolids (70-100% of samples) but less often in fresh dewatered cake biosolids (50-60%); with low levels in fresh cake (<100 cells/g dw)...
January 13, 2017: Water Environment Research: a Research Publication of the Water Environment Federation
https://www.readbyqxmd.com/read/28087526/rapid-enrichment-of-dehalococcoides-like-bacteria-by-partial-hydrophobic-separation
#10
Hanna R Temme, Kipp Sande, Tao Yan, Paige J Novak
: Organohalide respiring bacteria can be difficult to enrich and isolate, which can limit research on these important organisms. The goal of this research was to develop a method to rapidly (minutes to days) enrich these organisms from a mixed community. The method presented is based on the hypothesis that organohalide respiring bacteria would be more hydrophobic than other bacteria as they dehalogenate hydrophobic compounds. The developed method tests this hypothesis by separating a portion of putative organohalide respiring bacteria, those phylogenetically related to Dehalococcoides mccartyi, at the interface between a hydrophobic organic solvent and aqueous media...
January 13, 2017: Applied and Environmental Microbiology
https://www.readbyqxmd.com/read/28087103/identifying-methanogen-community-structures-and-their-correlations-with-performance-parameters-in-four-full-scale-anaerobic-sludge-digesters
#11
Taewoan Koo, Seung Gu Shin, Joonyeob Lee, Gyuseong Han, Woong Kim, Kyungjin Cho, Seokhwan Hwang
Four full-scale mesophilic anaerobic digesters treating waste sludge were monitored to characterize methanogen communities and their relationship with process parameters. The performance of the four digesters were dissimilar with the average chemical oxygen demand removal efficiencies between 24 and 45% and differing pH. Real-time quantitative PCR showed that archaeal 16S rRNA gene concentration ([ARC]) and, more pronouncedly, its ratio to bacterial counterpart ([ARC]/[BAC]) correlated positively with the performance parameters, including the lipid removal efficiency...
January 4, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28081527/enhanced-microalgal-biomass-and-lipid-production-from-a-consortium-of-indigenous-microalgae-and-bacteria-present-in-municipal-wastewater-under-gradually-mixotrophic-culture-conditions
#12
Hyun Uk Cho, Young Mo Kim, Jong Moon Park
The goal of this study was to investigate the influences of gradually mixotrophic culture conditions on microalgal biomass and lipid production by a consortium of indigenous microalgae and bacteria present in raw municipal wastewater. Lab-scale photobioreactors containing the consortium were operated in repeated batch mode. Initial cultivation (phase I) was performed using only the municipal wastewater, then 10% and 25% of the reactor volumes were replaced with the effluent from a sewage sludge fermentation system producing volatile fatty acids (SSFV) at the beginnings of phase II and phase III, respectively...
December 25, 2016: Bioresource Technology
https://www.readbyqxmd.com/read/28081525/effect-of-free-nitrous-acid-pre-treatment-on-primary-sludge-at-low-exposure-times
#13
S Zahedi, P Icaran, Z Yuan, M Pijuan
The present study was undertaken to investigate the effect of different free nitrous acid (FNA) concentrations at low pre-treatment times (PTs) (1, 2 and 5h) and without pH control with mild agitation on primary sludge (PS) biodegradability and methane production (MP). Increasing PTs resulted in an increase in the solubility of the organic matter (around 25%), but not on cell-mortality (>75% in all the cases with FNA) and neither on methane generation. FNA pre-treatment at low PTs improve MP (around 16% at PT of 1h and 650mg N-NO2(-)/L)...
January 4, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28081203/mechanism-and-parameter-optimization-of-fenton-s-reagent-integrated-with-surfactant-pretreatment-to-improve-sludge-dewaterability
#14
Yi Xing, Zhiqiang Wang, Chen Hong, Qiang Yang, Lihui Feng, Mengmeng Jia, Yifei Li
Sludge dewatering can effectively reduce the volume and mass of sludge for subsequent treatment and disposal. The work validated the potential of Fenton's reagent combined with dodecyl dimethyl benzyl ammonium chloride (DDBAC) in improving sludge dewaterability and proposed the mechanism of joint conditioning. The composite conditioner dosage was optimized using response surface methodology. Results indicated the good conditioning capability of the composite conditioners. The optimum dosages for H2O2, Fe2+, and DDBAC were 44...
2017: PloS One
https://www.readbyqxmd.com/read/28079271/uptake-and-elimination-kinetics-of-the-biocide-triclosan-and-the-synthetic-musks-galaxolide-and-tonalide-in-the-earthworm-dendrobaena-veneta-when-exposed-to-sewage-sludge
#15
Ivo Havranek, Claire Coutris, Hans Ragnar Norli, Pierre-Adrien Rivier, Erik J Joner
Sewage sludge is an important amendment that enriches soils with organic matter and provides plants with nutrients such as nitrogen and phosphorus. However, knowledge on fate and effects of organic pollutants present in the sludge on soil organisms is limited. In the present study, the uptake of triclosan, galaxolide, and tonalide in the earthworm Dendrobaena veneta was measured one week after amendment of agricultural soil with sewage sludge, while elimination kinetics were assessed over a 21-day period after transferring worms to a clean soil...
January 12, 2017: Environmental Toxicology and Chemistry
https://www.readbyqxmd.com/read/28078398/potential-coupling-effects-of-ammonia-oxidizing-and-anaerobic-ammonium-oxidizing-bacteria-on-completely-autotrophic-nitrogen-removal-over-nitrite-biofilm-formation-induced-by-the-second-messenger-cyclic-diguanylate
#16
Chao Wang, Sitong Liu, Xiaochen Xu, Chuanqi Zhao, Fenglin Yang, Dong Wang
The objective of this study was to investigate the influence of extracellular polymeric substance (EPS) on the coupling effects between ammonia-oxidizing bacteria (AOB) and anaerobic ammonium-oxidizing (anammox) bacteria for the completely autotrophic nitrogen removal over nitrite (CANON) biofilm formation in a moving bed biofilm reactor (MBBR). Analysis of the quantity of EPS and cyclic diguanylate (c-di-GMP) confirmed that the contents of polysaccharides and c-di-GMP were correlated in the AOB sludge, anammox sludge, and CANON biofilm...
January 11, 2017: Applied Microbiology and Biotechnology
https://www.readbyqxmd.com/read/28076690/effect-of-intermittent-aeration-strategies-on-treatment-performance-and-microbial-community-of-an-ifas-reactor-treating-municipal-wastewater
#17
Nitin Kumar Singh, Akansha Bhatia, Absar Ahmad Kazmi
This study investigated the effect of various intermittent aeration (IA) cycles, characterized by the ratio of non-aeration to aeration time, on organics and nutrient removal, and microbial communities in an integrated fixed film activated sludge (IFAS) reactor treating municipal wastewater. Average effluent BOD, COD, TSS, TN and TP values were noted as 20, 50, 30, 12 and 1.5 mgL(-1), respectively in continuous aeration mode. A total of four operational conditions (run 1, continuous aeration; run 2, 150/30 min aeration on/off time; run 3, 120/60 min aeration on/off time; run 4, 90/60 min aeration on/off time) were investigated in IFAS reactor assessment...
January 11, 2017: Environmental Technology
https://www.readbyqxmd.com/read/28069308/partition-and-fate-analysis-of-fluoroquinolones-in-sewage-sludge-during-anaerobic-digestion-with-thermal-hydrolysis-pretreatment
#18
Ning Li, Huajie Liu, Yonggang Xue, Hongyang Wang, Xiaohu Dai
Fluoroquinolones (FQs) are broad-spectrum synthetic antibiotics that play an important role in the treatment of serious bacterial infections. FQs can reach wastewater treatment plants from different routes, and eventually accumulate in activated sludge. In this study, a solid-phase extraction (SPE) with HPLC-FLD detection method was utilized to investigate the partition and fate of FQs in digested sludge when thermal hydrolysis was used as pretreatment. As a result, thermal hydrolysis showed minor effects on the fate of FQs in batch anaerobic digestion processes, while anaerobic digestion alone removed >60% FQs and finally assisted in the mitigation of the inhibitory effects to microbial communities...
January 6, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28069218/evaluation-of-a-biological-wastewater-treatment-system-combining-an-osa-process-with-ultrasound-for-sludge-reduction
#19
P M Romero-Pareja, C A Aragon, J M Quiroga, M D Coello
Sludge production is an undesirable by-product of biological wastewater treatment. The oxic-settling-anaerobic (OSA) process constitutes one of the most promising techniques for reducing the sludge produced at the treatment plant without negative consequences for its overall performance. In the present study, the OSA process is applied in combination with ultrasound treatment, a lysis technique, in a lab-scale wastewater treatment plant to assess whether sludge reduction is enhanced as a result of mechanical treatment...
May 2017: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/28068666/mitigation-of-membrane-biofouling-in-mbr-using-a-cellulolytic-bacterium-undibacterium-sp-dm-1-isolated-from-activated-sludge
#20
Chang Hyun Nahm, Seonki Lee, Sang Hyun Lee, Kibaek Lee, Jaewoo Lee, Hyeokpil Kwon, Kwang-Ho Choo, Jung-Kee Lee, Jae Young Jang, Chung-Hak Lee, Pyung-Kyu Park
Biofilm formation on membrane surface results in the loss of permeability in membrane bioreactors (MBRs) for wastewater treatment. Studies have revealed that cellulose is not only produced by a number of bacterial species but also plays a key role during formation of their biofilm. Hence, in this study, cellulase was introduced to MBR as a cellulose-induced biofilm control strategy. For practical application of cellulase to MBR, a cellulolytic (i.e., cellulase-producing) bacterium, Undibacterium sp. DM-1, was isolated from a lab-scale MBR for wastewater treatment...
January 9, 2017: Journal of Microbiology and Biotechnology
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