Simulation analysis of flow velocity and liquid film of saline wastewater in falling film evaporation

Liu, Bing; Wang, Xinlong; Liu, Youle; Gao, Yu; Ma, Zhen; Xue, Junmin

doi:10.1016/j.eti.2020.100790

Cited by 19 publications

(7 citation statements)

References 27 publications

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“…(1) Mathematical models of flow and heat transfer There were three types of multiphase flow models in numerical simulation, including the VOF model (Liu et al 2020), mixture model (González-Teruel et al 2020), and Eulerian model (Dolejší & Svärd 2020). Among them, the VOF model was a surface tracing method under a fixed Eulerian grid, where different fluid components were traced by solving the same momentum set equation for the volume fraction of each fluid phase (Yang et al 2008).…”

Section: Numerical Simulationmentioning

confidence: 99%

Scaling trend of coal chemical saline wastewater in falling film evaporator: experimental solid–liquid equilibrium and numerical simulation

Liu

et al. 2022

Water Supply

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It was important to master firstly scaling mechanism to slow down scaling, which was one of the important problems faced by saline wastewater treatment with falling film evaporators. In this paper, the phase equilibrium data of ternary system NaCl-CaCl2-H2O at 303.15–373.15 K were measured, and the prediction of the flow characteristics and scaling tendency of salt-containing wastewater in the evaporation tube was investigated by numerical simulation based on the phase equilibrium results. The results showed that the mesostable phase diagram of the ternary system was of simple type, and w(NaCl) and w(CaCl2) showed regular variation with temperature when w(NaCl) in the system was 15–28%. Moreover, the components of the four saline wastewaters (10% NaCl + 9, 10, 11, 12% CaCl2) with less salt content had a faster heating and a faster rate of evaporation of the liquid film in the evaporation tube. Based on the solubility in the experiments and simulations, it was concluded that NaCl crystals were precipitated at tube lengths of 718 mm, 942 mm, 966 mm, and 1,000 mm for four salt concentrations in the evaporation process by comparison, and the reliability of the predicted loci was also demonstrated by a falling film evaporation experimental setup.

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Section: Numerical Simulationmentioning

confidence: 99%

Scaling trend of coal chemical saline wastewater in falling film evaporator: experimental solid–liquid equilibrium and numerical simulation

Liu

et al. 2022

Water Supply

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“…Also, some of them are insufficient for the diffusion of pollutants (Shatat & Riffat, 2012; M. Wu, Tang, et al, 2013; X. Wu, Du, et al, 2013). Likewise, treatment technologies such as the biological treatment (Cui et al, 2021; Eom et al, 2018; Tomei et al, 2017; Zhou et al, 2020), physicochemical treatments (Liu et al, 2020; Mosquera Corral et al, 2021; Q. Wang et al, 2021) and combined (hybrid) treatments (Song et al, 2018; Panagopoulos, 2021; Xu et al, 2021; H. Zhang, Zhou, et al, 2021), constructed wetlands (CWs) (Lv et al, 2021; Sepúlveda et al, 2020; W. Wang, Wang, et al, 2020; Zhou et al, 2020), zeolite‐based treatments (Alsayed & Ashraf, 2021; Cao et al, 2021), aerobic and anaerobic treatments (Oliveira et al, 2021; Val del Río et al, 2021), and halophilic microorganisms‐assisted treatments (Capodici et al, 2018; Cui et al, 2021; Maharaja et al, 2020) are also adopted for saline wastewater treatment. Treatment and reuse of saline wastewater by CWs has become a common practice in the recent years, because of its low costs, aesthetic values, efficiency, and ecofriendly characteristics over other conventional wastewater treatment methods (Liang, Zhu, Bañuelos, Yan, Shutes, et al, 2017; X. Wang, Zhu, et al, 2020).…”

Section: Treatment Technologies Available For Saline Wastewatermentioning

confidence: 99%

Current available treatment technologies for saline wastewater and land‐based treatment as an emerging environment‐friendly technology: A review

Marathe

Singh

Raghunathan

et al. 2021

Water Environment Research

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Different industrial activities such as agro‐food processing and manufacturing, leather manufacturing, and paper and pulp production generate highly saline wastewater. Direct discharge of saline wastewater has resulted in pollution of waterbodies by very high magnitudes. Consequently, an enormous number of pollutants such as heavy metals, salts, and organic matter are also released into the environment threatening the survival of human and biota. Saline wastewater also has significant effects on survival of plants, agricultural activities, and groundwater systems. Several treatments and disposal technologies are available for saline wastewater, but the selection of the most appropriate treatment and disposal technology still remains a major challenge with respect to the economic or technical constraints. Considering the sustainable management of saline wastewater, the present review is an attempt to compile the existing and emerging technologies for the treatment of saline wastewater. Among all the individual and hybrid technologies, land‐based treatment systems are proven to be the most efficient technologies considering the energy demands, economic, and treatment efficiencies. Likewise, new and sustainable technologies are the need of hour integrating both the treatment and management and the resource recovery factors along with the ultimate goal of the protection in terms of human health and environmental aspect. Practitioner points Physico‐chemical treatment technologies for saline wastewater. Combined/Hybrid technologies for the treatment of saline wastewater. Land‐based treatments as the environment friendly and sustainable method for saline wastewater treatment and disposal. Role of phytoremediation in land‐based treatment.

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“…Nevertheless, the soil characteristics could substantially change due to the treated waters salt or heavy metal content, i.e., from industrial sources. Therefore, in some cases, the treated industrial wastewater is mixed with domestic sewage and directly applied on agricultural lands [72]. From a resource recovery viewpoint, it is always advisable to look for potential options wherein value-added products such as biopolymers can be recovered and commercialized for practical applications.…”

Section: Environmental Factors Influencing the Wastewater Characteristics And Its Impact On Agriculturementioning

confidence: 99%

Removal and recovery of nutrients and value-added products from wastewater: technological options and practical perspective

Srivastava

Pothu

Sanchez

et al. 2021

Syst Microbiol and Biomanuf

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Wastewaters from various process industries, namely food and agricultural, sugar mill, brewery, milk, vegetable and fruit, and meat and fisheries processing industries and their wastewater effluents contain nutrients, organic matter, inorganic, heavy metals, suspended solids, and pathogens. The discharges of non-treated wastewater enter the nearby aquatic ecosystem (e.g., lakes, rivers) and are a significant concern due to the presence of different nutrients, competing ions and C containing pollutants. It causes excessive growth of algae, loss of habitat/species, and other negative impacts on human health/environment. In the present review, different treatment approaches have been discussed in utilizing these nutrients to synthesize value-added products such as biopolymer, biofuel, pigment, organic acid, or enzymes. These biopolymers can be used to prepare various food products/packaging materials. Dextran, chitosan, carrageenan, alginate, and pectin are good examples of non-food biopolymers. Besides these products, poly-β-hydroxybutyrate (PHB) synthesis from wastewater nutrients is reported as a new source of bio-nanocomposite materials/biopolymer-based coatings. In this review, the different treatment approaches are discussed, which are being used worldwide for the removal/recovery of nutrients, toxic pollutants, and the potential resource recovery of value-added products from wastewater.

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Simulation analysis of flow velocity and liquid film of saline wastewater in falling film evaporation

Cited by 19 publications

References 27 publications

Scaling trend of coal chemical saline wastewater in falling film evaporator: experimental solid–liquid equilibrium and numerical simulation

Scaling trend of coal chemical saline wastewater in falling film evaporator: experimental solid–liquid equilibrium and numerical simulation

Current available treatment technologies for saline wastewater and land‐based treatment as an emerging environment‐friendly technology: A review

Removal and recovery of nutrients and value-added products from wastewater: technological options and practical perspective

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