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https://www.readbyqxmd.com/read/28324850/sludge-management-modeling-to-enhance-p-recovery-as-struvite-in-wastewater-treatment-plants
#1
N Martí, R Barat, A Seco, L Pastor, A Bouzas
Interest in phosphorus (P) recovery and reuse has increased in recent years as supplies of P are declining. After use, most of the P remains in wastewater, making Wastewater Treatment Plants (WWTPs) a vital part of P recycling. In this work, a new sludge management operation was studied by modeling in order to recover P in the form of struvite and minimize operating problems due to uncontrolled P precipitation in WWTPs. During the study, intensive analytical campaigns were carried out on the water and sludge lines...
March 15, 2017: Journal of Environmental Management
https://www.readbyqxmd.com/read/28324839/contributions-of-trace-elements-to-the-sea-by-small-uncontaminated-rivers-effects-of-a-water-reservoir-and-a-wastewater-treatment-plant
#2
Miguel Ángel Álvarez-Vázquez, Ricardo Prego, Miguel Caetano, Elena De Uña-Álvarez, Maryló Doval, Susana Calvo, Carlos Vale
Trace element contributions from small rivers to estuaries is an issue barely addressed in the literature. In this work, freshwater flowing into the Ria of Cedeira (NW Iberian Peninsula) was studied during a hydrological year through the input from three rivers, one considered uncontaminated (the Das-Mestas River), a second affected by urban treated wastewater discharges (the Condomiñas River), and the third containing a water reservoir for urban supply (the Forcadas River). With the objective of assessing the possible influence of human pressure, the annual yields for selected trace elements (Al, Fe, As, Cd, Co, Cr, Cu, Mn, Mo, Ni and Pb) were estimated and compared by normalizing by basin surface...
March 15, 2017: Chemosphere
https://www.readbyqxmd.com/read/28324710/dual-substrate-limitation-modeling-and-implications-for-mainstream-deammonification
#3
Heather A Stewart, Ahmed Al-Omari, Charles Bott, Haydee De Clippeleir, Chunyang Su, Imre Takacs, Bernhard Wett, Arash Massoudieh, Sudhir Murthy
Substrate limitation occurs frequently in wastewater treatment and knowledge about microbial behavior at limiting conditions is essential for the use of biokinetic models in system design and optimization. Monod kinetics are well-accepted for modeling growth rates when a single substrate is limiting, but several models exist for treating two or more limiting substrates simultaneously. In this study three dual limitation models (multiplicative, minimum, and Bertolazzi) were compared based on experiments using nitrite-oxidizing bacteria (limited by dissolved oxygen and nitrite) and ANaerobic AMMonia-OXidizing bacteria or Aanammox (limited by ammonium and nitrite) within mixed liquor from deammonification pilots...
March 9, 2017: Water Research
https://www.readbyqxmd.com/read/28324253/the-relationship-between-mineral-contents-particle-matter-and-bottom-ash-distribution-during-pellet-combustion-molar-balance-and-chemometric-analysis
#4
Mejdi Jeguirim, Nesrine Kraiem, Marzouk Lajili, Chamseddine Guizani, Antonis Zorpas, Yann Leva, Laure Michelin, Ludovic Josien, Lionel Limousy
This paper aims to identify the correlation between the mineral contents in agropellets and particle matter and bottom ash characteristics during combustion in domestic boilers. Four agrifood residues with higher mineral contents, namely grape marc (GM), tomato waste (TW), exhausted olive mill solid waste (EOMSW) and olive mill wastewater (OMWW), were selected. Then, seven different pellets were produced from pure residues or their mixture and blending with sawdust. The physico-chemical properties of the produced pellets were analysed using different analytical techniques, and a particular attention was paid to their mineral contents...
March 21, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28319860/effects-of-silver-nanoparticles-on-survival-biomass-change-and-avoidance-behaviour-of-the-endogeic-earthworm-allolobophora-chlorotica
#5
C Brami, A R Glover, K R Butt, C N Lowe
Increasing commercial application of silver nanoparticles (Ag NP) and subsequent presence in wastewater and sewage sludge has raised concerns regarding their effects in the aquatic and terrestrial environment. Several studies have employed standardised acute and chronic earthworm-based tests to establish the toxicological effects of Ag NP within soil. These studies have relied heavily on the use of epigiec earthworm species which may have limited ecological relevance in mineral soil. This study assessed the influence of Ag NP (uncoated 80nm powder) and AgNO3 on survival, change in biomass and avoidance behaviour in a soil dwelling (endogiec) species, Allolobophora chlorotica...
March 15, 2017: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/28319778/polyhydroxyalkanoates-pha-production-from-synthetic-waste-using-pseudomonas-pseudoflava-pha-synthase-enzyme-activity-analysis-from-p-pseudoflava-and-p-palleronii
#6
M Venkateswar Reddy, Yasuteru Mawatari, Rui Onodera, Yuki Nakamura, Yuka Yajima, Young-Cheol Chang
Synthetic wastewater (SW) at various carbon concentrations (5-60g/l) were evaluated for polyhydroxyalkanoates (PHA) production using the bacteria Pseudomonas pseudoflava. Bacteria showed highest PHA production with 20g/l (57±5%), and highest carbon removal at 5g/l (74±6%) concentrations respectively. Structure, molecular weight, and thermal properties of the produced PHA were evaluated using various analytical techniques. Bacteria produced homo-polymer [poly-3-hydroxybutyrate (P3HB)] when only acetate was used as carbon source; and it produced co-polymer [poly-(3-hydroxybutyrate-co-3-hydroxyvalerate) P(3HB-co-3HV)] by addition of co-substrate propionate...
March 4, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28319771/a-fancy-eco-compatible-wastewater-treatment-system-green-bio-sorption-reactor
#7
Yaqian Zhao, Ranbin Liu, Jinhui Zhao, Lei Xu, Caroline Sibille
A novel concept was proposed and preliminarily investigated by embedding alum sludge-based constructed wetland into conventional activated sludge system in terms of Green Bio-sorption Reactor (GBR). This novel GBR inherited the aesthetic value of constructed wetland and owned the robust phosphorus (P) adsorption along with the benefit of carriers' addition (dewatered alum sludge). The preliminary demonstration was conducted in a lab-scale sequencing batch reactor (SBR) system without biological phosphorus removal process...
March 9, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28319759/removal-of-hydrogen-sulfide-generated-during-anaerobic-treatment-of-sulfate-laden-wastewater-using-biochar-evaluation-of-efficiency-and-mechanisms
#8
Jarupat Kanjanarong, Balendu S Giri, Deb P Jaisi, Fernanda R Oliveira, Piyarat Boonsawang, Sumate Chaiprapat, R S Singh, Avula Balakrishna, Samir Kumar Khanal
Removal of hydrogen sulfide (H2S) from biogas was investigated in a biochar column integrated with a bench-scale continuous-stirred tank reactor (CSTR) treating sulfate-laden wastewater. Synthetic wastewater containing sulfate concentrations of 200-2000mg SO4(2-)/L was used as substrate, and the CSTR was operated at an organic loading rate of 1.5g chemical oxygen demand (COD)/L·day and a hydraulic retention time (HRT) of 20days. The biochar was able to remove about 98.0 (±1.2)% of H2S for the ranges of concentrations from 105-1020ppmv, especially at high moisture content (80-85%)...
March 4, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28319758/trace-metals-supplementation-in-anaerobic-membrane-bioreactors-treating-highly-saline-phenolic-wastewater
#9
Julian David Muñoz Sierra, Carlos Lafita, Carmen Gabaldón, Henri Spanjers, Jules B van Lier
Biomass requires trace metals (TM) for maintaining its growth and activity. This study aimed to determine the effect of TM supplementation and partitioning on the specific methanogenic activity (SMA), with a focus on cobalt and tungsten, during the start-up of two lab-scale Anaerobic Membrane Bioreactors (AnMBRs) treating saline phenolic wastewater. The TM partitioning revealed a strong accumulation of sodium in the biomass matrix and a wash-out of the majority of TM in the reactors, which led to an SMA decrease and a low COD removal of about 30%...
March 7, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28319719/year-round-phytofiltration-lagoon-assessment-using-pistia-stratiotes-within-a-pilot-plant-scale-biorefinery
#10
Eugenia J Olguín, Daniel A García-López, Ricardo E González-Portela, Gloria Sánchez-Galván
Phytofiltration lagoons are phytoremediation technologies suitable for tropical and sub-tropical regions requiring cost-effective and echo-friendly technologies. A biorefinery of fourth generation has been implemented at pilot plant level in Xalapa, Mexico, and the phytofiltration lagoon, being the first module for provision of treated water and plant biomass for biofuel production plays a key role. The aim of this work was to evaluate the performance of such phytofiltration lagoon with a working volume of 13,000 L for the removal of nutrients from an urban river polluted with domestic wastewater and the biomass productivity of the macrophyte Pistia stratiotes, during five different experimental periods, comprising 42 days each one...
March 16, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28319712/toxic-compounds-biodegradation-and-toxicity-of-high-strength-wastewater-treated-under-elevated-nitrogen-concentration-in-the-activated-sludge-and-membrane-bioreactor-systems
#11
Jarungwit Boonnorat, Nimaradee Boonapatcharoen, Pradthana Prachanurak, Ryo Honda, Supaporn Phanwilai
This research has assessed the removal efficiencies of toxic compounds in the high strength wastewater (the leachate and agriculture wastewater mixture) using the activated sludge (AS) and membrane bioreactor (MBR) technologies under two carbon to nitrogen (C/N) ratios (C/N 14 and 6) and two toxic compounds concentrations (8-396μg/L and 1000μg/L). In addition, the toxicity evaluations of the AS and MBR effluents to the aquatic environment were undertaken at five effluent dilution ratios (10, 20, 30, 50 and 70% v/v)...
March 16, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28319370/uptake-and-disposition-of-select-pharmaceuticals-by-bluegill-exposed-at-constant-concentrations-in-a-flow-through-aquatic-exposure-system
#12
Jian-Liang Zhao, Edward T Furlong, Heiko L Schoenfuss, Dana Ward Kolpin, Kyle L Bird, David J Feifarek, Eric A Schwab, Guang-Guo Ying
The increasing use of pharmaceuticals has led to their subsequent input into and release from wastewater treatment plants, with corresponding discharge into surface waters that may subsequently exert adverse effects upon aquatic organisms. Although the distribution of pharmaceuticals in surface water has been extensively studied, the details of uptake, internal distribution, and kinetic processing of pharmaceuticals in exposed fish have received less attention. For this research, we investigated the uptake, disposition, and toxicokinetics of five pharmaceuticals (diclofenac, methocarbamol, rosuvastatin, sulfamethoxazole, and temazepam) in bluegill sunfish (Lepomis macrochirus) exposed to environmentally relevant concentrations (1,000-4,000 ng L-1) in a flow-through exposure system...
March 20, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28318963/an-investigation-of-ultrasound-effect-on-digestate-solubilization-and-methane-yield
#13
Temesgen Garoma, David Pappaterra
In this study, different ultrasound power intensities of 0.05-0.21kW/L (4.13-16.52kWh/kg TS) were applied at a frequency of 20kHz and for durations of 5-20min to digestate obtained from a domestic wastewater treatment plant. The ultrasonic effect on digestate solubilization was revealed by increased levels of soluble Chemical Oxygen Demand (sCOD), soluble Total Organic Carbon (sTOC), and soluble Total Nitrogen (sTN) released into the solution. The highest material release was achieved at an ultrasonic energy intensity of 0...
March 16, 2017: Waste Management
https://www.readbyqxmd.com/read/28318934/performance-evaluation-of-the-pilot-scale-upflow-anaerobic-sludge-blanket-downflow-hanging-sponge-system-for-natural-rubber-processing-wastewater-treatment-in-south-vietnam
#14
Takahiro Watari, Trung Cuong Mai, Daisuke Tanikawa, Yuga Hirakata, Masashi Hatamoto, Kazuaki Syutsubo, Masao Fukuda, Ngoc Bich Nguyen, Takashi Yamaguchi
A pilot-scale upflow anaerobic sludge blanket (UASB)-downflow hanging sponge system (DHS) combined with an anaerobic baffled reactor (ABR) and a settling tank (ST) was installed in a natural rubber processing factory in South Vietnam and its process performance was evaluated for 267days. The UASB reactor achieved a total removal efficiency of 55.6±16.6% for chemical oxygen demand (COD) and 77.8±10.3% for biochemical oxygen demand (BOD) with an organic loading rate of 1.7±0.6kg-COD·m(-3)·day(-1). The final effluent of the proposed system had 140±64mg·L(-1) of total COD, 31±12mg·L(-1) of total BOD, and 58±24mg-N·L(-1) of total nitrogen...
March 7, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28318793/fate-and-mass-balance-of-bisphenol-analogues-in-wastewater-treatment-plants-in-xiamen-city-china
#15
Qian Sun, Yuwen Wang, Yan Li, Muhammad Ashfaq, Lanhua Dai, Xiaoqing Xie, Chang-Ping Yu
Due to the well-known endocrine disrupting ability of bisphenol A (BPA), its production and usage have been regulated. Consequently, other bisphenol analogues (BPs) have been used as the replacement of BPA. Despite their widespread use, few studies have investigated the occurrence and fate of BPs in wastewater treatment plants (WWTPs). In this study, we conducted a city-wide monitoring survey and collected the wastewater and sludge samples from seven WWTPs in Xiamen, China over seven days. The concentrations of dissolved and adsorbed BPs in the influent and effluent, together with the BP concentrations in the sludge were determined...
March 17, 2017: Environmental Pollution
https://www.readbyqxmd.com/read/28318787/municipal-wastewater-treatment-plant-effluent-induced-effects-on-freshwater-mussel-populations-and-the-role-of-mussel-refugia-in-recolonizing-an-extirpated-reach
#16
Patricia L Gillis, Rodney McInnis, Joseph Salerno, Shane R de Solla, Mark R Servos, Erin M Leonard
Global human population and urbanization continually increase the volume of wastewater entering aquatic environments. Despite efforts to treat these effluents, they contribute a diverse suite of substances that enter watersheds at concentrations that have the potential to elicit adverse effects on aquatic organisms. The relationship between wastewater treatment plant (WWTP) effluent exposure and biological responses within aquatic ecosystems remains poorly understood, especially at the population level. To examine the effect of WWTP effluents on sentinel invertebrates, freshwater mussels were assessed in the Grand River, Ontario, in populations associated with the outfall of a major WWTP...
March 15, 2017: Environmental Pollution
https://www.readbyqxmd.com/read/28318786/modulation-of-the-stress-response-in-wild-fish-is-associated-with-variation-in-dissolved-nitrate-and-nitrite
#17
Tom G Pottinger
Disruption of non-reproductive endocrine systems in wildlife by chemicals has received little attention but represents a potentially significant problem. Nitrate is a major anthropogenic contaminant in the freshwater aquatic environment and has been identified as a potential disrupter of endocrine function in aquatic animals. This study was conducted to investigate the relationship between the function of the neuroendocrine stress axis in fish and inorganic N loading along reaches of rivers receiving cumulative point source and diffuse chemical inputs...
March 15, 2017: Environmental Pollution
https://www.readbyqxmd.com/read/28318568/multiresidue-analysis-of-24-water-framework-directive-priority-substances-by-on-line-solid-phase-extraction-liquid-chromatography-tandem-mass-spectrometry-in-environmental-waters
#18
Adrià Rubirola, Mª Rosa Boleda, Mª Teresa Galceran
This paper reports the development of a fully multiresidue and automated on-line solid phase extraction (SPE) - liquid chromatography tandem mass spectrometry (LC-MS/MS) method for the determination of 24 priority substances (PS) belonging to different classes (pesticides, hormones or pharmaceuticals) included in the Directive 2013/39/UE and the recent Watch List (Decision 2015/495) in water samples (drinking water, surface water, and effluent wastewaters). LC-MS/MS conditions and on-line SPE parameters such as sorbent type, sample and wash volumes were optimized...
March 6, 2017: Journal of Chromatography. A
https://www.readbyqxmd.com/read/28318301/comparative-study-on-removal-of-enteric-pathogens-from-domestic-wastewater-using-typha-latifolia-and-cyperus-rotundus-along-with-different-substrate
#19
Rita P Shingare, Sneha V Nanekar, Prashant R Thawale, R Karthik, Asha A Juwarkar
A comparative study was carried out over a period of six months to evaluate the efficiency of different substrate material along with macrophytes Typha latifolia and Cyperus rotundus in treating domestic wastewater intended for reuse in agriculture. The study was conducted over a period of six months with different retention time and observations were taken twice per month. One-way ANOVA and Tukey's HSD tests were used to determine statistical significant differences between experimental columns. Treatment with T...
March 20, 2017: International Journal of Phytoremediation
https://www.readbyqxmd.com/read/28318297/impacts-of-vegetation-and-temperature-on-the-treatment-of-domestic-sewage-in-constructed-wetlands-incorporated-with-ferric-carbon-micro-electrolysis-material
#20
Qingwei Zhou, Hui Zhu, Gary Bañuelos, Baixing Yan, Yinxiu Liang, Jing Yu, Huai Li
Ferric-Carbon Micro-Electrolysis (Fe/C-M/E) material had been widely used for the pretreatment of wastewater. Therefore, we hypothesized that Fe/C-M/E material could enhance the treatment of domestic sewage when integrated into CWs. In this study, constructed wetlands (CWs) integrated with Fe/C-M/E material were developed. During the experiment of vegetation influence, percentages of NH4(+)-N, NO3(-)-N, TN, and COD removed in polyculture (W1) were up to 91.8%, 97.0%, 92.3%, and 85.4%, respectively, which were much higher than those in Lythrum salicaria monoculture (W2) and Canna indica monoculture (W3)...
March 20, 2017: International Journal of Phytoremediation
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