Effect of Geometrical dimensions and wastewater Temperature on the performance of an Induced Air Flotation unit for the treatment of industrial waste water

AlMaliky, Salam Bash

doi:10.5539/mas.v4n6p14

Cited by 6 publications

(3 citation statements)

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“…45 °C; this was based on the assumptions that limited microbial activity occurred within the upper mesophilic or lower thermophilic range of 40–50 °C . However, several recent studies have reported that anaerobic digestion at 45 °C can produce a remarkably identical (or even higher) liquid phase mass transfer rate and greater volumes of biogas, along with good quality effluent in terms of chemical oxygen demand (COD) reduction (80–90%) compared to mesophilic anaerobic digestion …”

Section: Introductionmentioning

confidence: 99%

Microbial population dynamics in temperature‐phased anaerobic digestion of municipal wastewater sludge

Hameed

Riffat

et al. 2019

J of Chemical Tech & Biotech

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BACKGROUND The present study compared the performance and capability of thermophilic–mesophilic, temperature‐phased anaerobic digestion (TPAD) of wastewater sludge at 45 and 55 °C in terms of rate of hydrolysis and methanogenesis at two point interval times – December and January – with operational conditions kept constant (total solid content 6.5%, solids retention time 12.5 days). RESULTS The reduction of volatile solids (VS) was 77% at 45 °C TPAD‐1 and 72% at 55 °C TPAD‐II. The accumulation of ammonia and volatile fatty acids (VFAs; propionic acid) were observed to be below the inhibitory range (>3000 mg L−1), whereas the methane (CH4) production (45 °C, 3.55 ± 0.47 L CH4 L−1 day−1; 35 °C, 1.44 ± 0.12 L CH4 L−1 day−1) remained considerably higher in TPAD‐I than TPAD‐II. Furthermore, the TPAD‐II system suffered from certain degree of instability due to high level of total VFAs (6087 ± 1578 mg L−1), low buffering capacity, increased level of total NH3 (2982 ± 219 mg L−1) and free NH3 (246 ± 25 mg L−1), and relatively reduced CH4 production (1.69 ± 0.1 L L−1 day). The bacterial and archaeal population of the TPADs investigated by 454 pyrosequencing and Illumina sequencing showed, in both TPAD systems, a bacterial community dominated by Firmicutes, followed by Bacteriodetes, Proteobacteria, Synergistetes and Actiniobacteria. The archaeal community was dominated by Methanimicrobia (74–84% Methanosarcina) and Methanobacteria (15–27% Methanobacterium). A progression from genus Clostridium to Coprothermobacter and Tepidanaerobacter, and Methanocarcina to Methanothermobacter and Methanobacterium was observed in TPAD‐II. CONCLUSIONS This study proved the processes driving the dynamics of key microbial population and its correlation with hydrolytic functionality of TPAD systems. © 2019 Society of Chemical Industry

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Section: Introductionmentioning

confidence: 99%

Microbial population dynamics in temperature‐phased anaerobic digestion of municipal wastewater sludge

Hameed

Riffat

et al. 2019

J of Chemical Tech & Biotech

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“…Since the initial invention of froth flotation in the early 20 th century (Rao, 2004a) flotation research has been ongoing and has enabled the process to be extended to other industrial applications that today include the recovery of oxide and oxidised material (Rao, 2004a), the recovery of soluble salts from saturated brine solutions (Cilek & Uresin, 2005;Ozcan & Miller, 2002;Ozdemir, et al, 2011;Miller, et al, 1997;Ozdemir, et al, 2009), the treatment of waste water (Al-Maliky, 2010a;Al-Maliky, 2010b;Rubio, et al, 2002;Polat & Erdogan, 2007), de-inking of paper during paper recycling (Watson, 1996;Saint-Amand, 1999;Beneventi, et al, 2007;Kemper, 1999) and the processing of oil sands (Wang, et al, 2010;Coleman, et al, 1995;Zhou, et al, 2004;Zhou, et al, 2013). In doing so froth flotation has established itself as one of the most important industrial applications of surface chemistry (Rao, 2004a;Fuerstenau, 1999).…”

Section: Introductionmentioning

confidence: 99%

The effect of mineral grain textures at particle surfaces on flotation response

Vos¹

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This research investigates the contribution of the spatial arrangement of hydrophobic mineral grains at particles surface towards their flotation response and its implications for forecasting flotation response. The approach taken was to estimate this grain textural characteristic from particle sections and to identify how it affected the overall rougher and scavenger copper mineral flotation recovery from two industrial copper flotation circuits.For the second circuit the overall rougher flotation kinetic parameters for the copper mineral were also evaluated.The first contribution of this work is the demonstration that a novel textural indicator is relevant to understanding the contribution of exposed mineral grain texture on the flotation process. It is the first mineral grain textural indicator that considers both the size of the grains and the degree to which they are dispersed at the particle surface. When the indicator was applied to particle sections from flotation feed, concentrate and tail samples from two industrial copper flotation circuits, it was shown, for the first time, with confidence that while particle size and perimeter composition affect particle flotation response the spatial arrangement of the copper mineral grains at the particle surface plays a key role.For the iron-oxide-copper-gold ore, copper mineral grains in complex texture classes produced statistically higher overall rougher recoveries for the 0-20% perimeter composition class. Chalcopyrite grains in complex texture classes in the copper porphyry ore produced higher overall rougher and scavenger recoveries for the 20-40% perimeter composition class. For the 0-20% perimeter composition class statistically meaningful differences were observed for the +106 m size class. It was shown that the higher overall recoveries for the complex texture classes in this case were due to increases in the overall rougher rate of flotation, the proportions of recoverable chalcopyrite in the feed or both. For both ores the largest proportions of copper mineral within complex perimeter texture classes were within coarse particles and complex textures were less common when particle perimeters comprised more than 40% of the copper minerals. This demonstrated that in order to study the impact of this textural characteristic for the two ores it must be done within well-defined particle size and perimeter composition classes, an important outcome that has not been reported in the current literature.The second contribution is a three-step method for evaluating the flotation response of copper minerals within different grain texture classes namely; particle perimeter texture II estimation, determining coefficients of variation in the mass proportions of the target mineral within perimeter texture-composition classes and mass reconciliation and recovery calculations. Another key contribution is in applying the bootstrap resampling technique to estimate these coefficients. This demonstrated the sensitivity of seemingly feasible perimeter texture-compos...

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“…It involves turbulent hydrodynamic conditions under which bubbles are generated by mechanical mixing and the dispersion of gas into water phase streams through high-speed impellers or diffusers as described for swirl liquid flow bubble generators(Saththasivam et al, 2016;Prakash et al, 2018). IGF systems (Figure2.11) have been widely used in treating various types of industrial wastewater from different sources including oil and gas production, pulp and paper mills, and dairy industry(Chebbi et al, 2018;Zasadowski et al, 2014;Al-Maliky, 2010).…”

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confidence: 99%

Investigation of microbubbles and nanobubbles gas flotation for oil separation from marine oily wastewater using response surface methodology

Shen¹

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Oily wastewater caused by marine oil spills brings great harm to the environment. In this work, the application of gas flotation with microbubbles and nanobubbles in separating crude oil droplets from oily wastewater is reported. The experiments were conducted in a flotation column with an internal diameter of 5.2 cm and a height of 100 cm. Response surface methodology was employed to examine the effects of three experimental factors (initial oil concentration, flotation time, and temperature of inlet wastewater) on the oil separation performance and the interaction between experimental factors. A good agreement was obtained between the predicted and experimental data of oil separation efficiency, with a high R 2 of 0.99 and an adjusted R 2 of 0.98.The optimization results demonstrate that the maximum oil separation efficiency (98.3%) was achieved under optimum experimental conditions of 524.5 mg/L initial oil concentration, 28.6 min flotation time, and 21.2°C inlet wastewater temperature.

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Effect of Geometrical dimensions and wastewater Temperature on the performance of an Induced Air Flotation unit for the treatment of industrial waste water

Cited by 6 publications

References 6 publications

Microbial population dynamics in temperature‐phased anaerobic digestion of municipal wastewater sludge

Microbial population dynamics in temperature‐phased anaerobic digestion of municipal wastewater sludge

The effect of mineral grain textures at particle surfaces on flotation response

Investigation of microbubbles and nanobubbles gas flotation for oil separation from marine oily wastewater using response surface methodology

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