Fibrous coalescence filtration in treating oily wastewater: A review

2021 ◽  
pp. 152808372110408
Author(s):  
Chandra Jeet Singh ◽  
Samrat Mukhopadhyay ◽  
Raju Seenivasan Rengasamy
Keyword(s):  
Granular Media ◽  
Complex Nature ◽  
Oily Wastewater ◽  
Fibrous Media ◽  
Water Emulsion ◽  
Surface Areas ◽  
Oil In Water ◽  
Droplet Sizes ◽  
Oil Concentration ◽  
Oil In Water Emulsion

Many industries discharge oil-in-water emulsion in the waste stream, often above the permissible limit causing serious environmental hazards. Porous media such as membrane and coalescence beds are employed to treat oily wastewater. A coalescence bed filter consists of either fibrous or granular packing and is used for removing larger oil droplets less than 100 μm from secondary emulsions. Fibrous media have higher porosities and specific surface areas than coarse granular media and hence give higher oil removal efficiency. To design an efficient fibrous coalescence bed filter for treating industrial discharge, understanding the mechanism of oil separation is important. This involves the surface wettability of fibers relating to surface chemistry and roughness. Further, fiber diameter, filter bed’s height, porosity, and pore size in relation to the oil droplet size and throughput and influent oil concentration are interactive parameters that affect the efficiency of coalescence. The performance of coalescence filtration is evaluated by analyzing the oil concentrations and D50 droplet sizes in the influent and effluent. In this article, the above-mentioned subjects are comprehensively reviewed from the reported research works, which highlights the complex nature of fibrous coalescence filtration.

Oil-in-water emulsion breaking marine bacteria for demulsifying oily wastewater

2019 ◽  
Vol 149 ◽  
pp. 292-301 ◽  
Author(s):  
Qinhong Cai ◽  
Zhiwen Zhu ◽  
Bing Chen ◽  
Baiyu Zhang
Keyword(s):  
Marine Bacteria ◽  
Oily Wastewater ◽  
Water Emulsion ◽  
Oil In Water ◽  
Oil In Water Emulsion

A Model for Lubrication by Oil-in-Water Emulsions

2009 ◽  
Vol 132 (1) ◽  
Author(s):  
Sy-Wei Lo ◽  
Tzu-Chun Yang ◽  
Yong-An Cian ◽  
Kuo-Cheng Huang
Keyword(s):  
Film Thickness ◽  
Volume Fraction ◽  
Ph Value ◽  
Oil Viscosity ◽  
Water Emulsion ◽  
Oil In Water ◽  
Critical Volume Fraction ◽  
Oil Concentration ◽  
Dynamics Simulations ◽  
Oil In Water Emulsion

A model for oil-in-water emulsion has been developed in this paper. A group of viscosity coefficients transiting smoothly and incessantly from the thick film region to the thin film region is defined. The contributions from disperse and continuous phases to the total lubricant pressure and pressure gradient are functions of the oil concentration and the film thickness. The parameters used in these functions are determined by a series of computational fluid dynamics simulations. The onset of inversion and the viscosity after inversion are also investigated. It is found that the critical volume fraction of oil in the inception of inversion is dependent on the oil viscosity and a factor regarding the combined effects from the emulsifier, pH value, droplet size, and the shear rate. A series of simulations using the proposed model has been carried out and compared with the experimental results, such as the film thickness and the extension of oil pool for various rolling speeds and supply oil concentrations. The numerical outputs are basically in agreement with the experiments.

scholarly journals A Review of the Processes Associated with the Removal of Oil in Water Pollution

2021 ◽  
Vol 13 (22) ◽  
pp. 12339
Author(s):  
Bradley Cerff ◽  
David Key ◽  
Bernard Bladergroen
Keyword(s):  
Effluent Treatment ◽  
Oily Wastewater ◽  
Significant Treatment ◽  
Water Separation ◽  
Water Emulsion ◽  
Dispersed Oil ◽  
Oil In Water ◽  
Emulsion Separation ◽  
Environmentally Friendly Process ◽  
Oil In Water Emulsion

Water plays an essential role in production and refining processes. Many industries that use petrochemicals also require water, especially for cleaning purposes. The wastewaters released by these processes are often rich in petroleum pollutants, which requires significant treatment prior to disposal. The presence of petroleum contaminants in rivers and oceans is a significant threat to human health, as well as to many animal species. A current challenge for most industries and conventional effluent treatment plants is compliance with accepted disposal standards for oil-polluted wastewater. Of particular importance is the processing of dispersed oil in water, as well as oil in water emulsion. Conventional oil and water separation methods for processing oil in water contamination have several technology gaps in terms of applicability and efficiency. The removal and effective processing of dispersed oil and emulsions from oily wastewater is a costly and significant problem. The objective of this paper is to provide a review of the principles associated with oil in water emulsion separation, with the aim of providing a more definitive understanding of the terminology, processes, and methodologies, which will assist the development of a more efficient, innovative and environmentally friendly process for the separation of oily wastewater.

The Film Formation Mechanism of High Water-Based Emulsions

2010 ◽  
Author(s):  
Jianbin Luo ◽  
Liran Ma
Keyword(s):  
Formation Mechanism ◽  
Film Formation ◽  
High Water ◽  
Metal Working ◽  
Water Emulsion ◽  
Volume Percentage ◽  
Oil In Water ◽  
Oil Concentration ◽  
Oil In Water Emulsion ◽  
Film Formation Mechanism

The oil-in-water emulsion has been widely used as lubricant in metal working such as metal rolling and cutting. The film formation ability of emulsion was considered as an important factor for evaluating the lubricating effectiveness. Although the film formation characteristics have been widely investigated, the mechanism is still not well understood. Furthermore there were seldom results reported on the emulsion with an oil volume percentage less than 1%. The film formation characteristic of emulsions with ultra-low oil concentration (0.005vol%) between a smooth plate and a highly polished steel ball was investigated. The effects of oil concentration and emulsifier concentration were investigated. New viewpoints on the film formation mechanism of emulsion were proposed.

Film forming characteristics of oil-in-water emulsion with super-low oil concentration

2009 ◽  
Vol 340 (1-3) ◽  
pp. 70-76 ◽  
Author(s):  
Liran Ma ◽  
Jianbin Luo ◽  
Chenhui Zhang ◽  
Shuhai Liu ◽  
Xinchun Lu ◽  
...  
Keyword(s):  
Water Emulsion ◽  
Oil In Water ◽  
Film Forming ◽  
Oil Concentration ◽  
Forming Characteristics ◽  
Oil In Water Emulsion
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