scholarly journals Research of novel process route and scale-up based on oil-water separation flotation column

2017 ◽  
Vol 8 (1) ◽  
pp. 111-122 ◽  
Author(s):  
Gen Huang ◽  
Hongxiang Xu ◽  
Lun Wu ◽  
Xiaobing Li ◽  
Yongtian Wang
Keyword(s):  
Sewage Treatment ◽  
Aeration Rate ◽  
Optimum Operating ◽  
Operating Parameters ◽  
The Novel ◽  
Water Separation ◽  
Flotation Column ◽  
Oil Water Separation ◽  
Feeding Speed ◽  
Oil Water

Abstract A novel process ‘coalescence-airflotation-carrier preferential adsorption’ utilising an oil-water separation flotation column with a unique structure was used in the oil-water separation field. The oil-water separation flotation column contains the cyclonic separation and airflotation separation which has advantages in oily sewage treatment, especially in polymer-flooding-drive oily sewage treatment. In this paper, different dimensions of flotation column with 1 m3 d−1, 30 m3 d−1 and 2,000 m3 d−1 oil-water separation systems were investigated. In addition, several operating parameters which impact separation, such as feeding speed, aeration rate, circulating pressure, adsorbents consumption and frother consumption were also investigated. The optimum operating parameters determined for 1 m3 d−1 the oil-water separation flotation column were a feeding speed of 0.042 m3 h−1, an aeration rate of 0.10 m3 h−1, a coal consumption of 4 (g coal)·(g oil)−1, a frother consumption of 10 mg L−1, and a circulating pressure of 0.12 MPa. The novel process cost reduced 55.8% than conventional two-stage airflotation process. In the 2,000 m3 d−1 oil-water separation experiment, the oil concentration and the oil removal efficiency of outlet are 23.39 mgL−1, 97.70%, respectively. Sediment is not produced during the oily sewage treatment using the novel process and flotation column.

Simulation Study of Three-Phase Flow Field Based on Microbubble Flotation

2013 ◽  
Vol 477-478 ◽  
pp. 226-231 ◽  
Author(s):  
Wei He ◽  
Zhe Kun Li ◽  
Ai Rong Tang ◽  
An Liu ◽  
Bang Gui He
Keyword(s):  
Structural Parameters ◽  
Operating Parameters ◽  
Phase Flow ◽  
Water Separation ◽  
Flotation Column ◽  
Factors Influencing ◽  
Three Phase ◽  
Three Phase Flow ◽  
Oil Water Separation ◽  
Oil Water

Analyzed the research status of flotation separation in the field of water treatment. By using CFD software, the important parameters of velocity and pressure in the flotation column are analyzed and contrasted. Through the simulation, it will identify design adequacy and optimize operating parameters and structural parameters. The important factors influencing floatation column separation are got. In the process of oil-water separation, keeping proper bubble size and gas holdup is necessary.

Research of Water Quality in Typical Low Permeability Oilfield Produced Water Treatment

2014 ◽  
Vol 556-562 ◽  
pp. 867-871
Author(s):  
Qiu Shi Zhao
Keyword(s):  
Water Quality ◽  
Oil Recovery ◽  
Treatment Process ◽  
Produced Water ◽  
Sewage Treatment ◽  
Oil Fields ◽  
Water Separation ◽  
Oil Water Separation ◽  
Oilfield Produced Water ◽  
Oil Water

It is significative to study sewage treatment process in low permeable oil fields. It could enhance the oil recovery. The water quality characteristics and oil/water separation characteristics were researched during different period process by GC-MS. It shows that there are about 108 kinds of organic matters, including 45 kinds of aliphatic hydrocarbon, 7 kinds of aine, 5 kinds of sulfocompound and 9 kinds of hexacyclic compounds, such as Benzene, phenol, naphthalene and anthracene. The percent of oil droplets which size was less than 10μm is 57.3%, compared to 91.6% which size was more than 50μm. It is difficult to separate the water and oil. The remaining oil was emulsified oil. The process was hard to decrease COD, and some pollutants were existed in water, such as Arsenic, Selenium, Mercury ,Cadmium and Cr6+. It is further proposed to optimize and develop this process to removal oil and suspended solids.

scholarly journals Application of a triblock copolymer additive modified polyvinylidene fluoride membrane for effective oil/water separation

2018 ◽  
Vol 5 (5) ◽  
pp. 171979 ◽  
Author(s):  
S. S. Shen ◽  
K. P. Liu ◽  
J. J. Yang ◽  
Y. Li ◽  
R. B. Bai ◽  
...  
Keyword(s):  
Polyvinylidene Fluoride ◽  
Triblock Copolymer ◽  
Oily Wastewater ◽  
The Novel ◽  
Permeate Flux ◽  
Cleaning Efficiency ◽  
Water Separation ◽  
Water Emulsion ◽  
Oil Water Separation ◽  
Oil Water

A hollow fibre membrane was fabricated by blending polyvinylidene fluoride (PVDF) with a triblock copolymer additive polymer that has both hydrophilic and oleophobic surface properties. The novel membrane was characterized and examined for oil/water separation under various system conditions, including different cross-flow rate, feed temperature, trans-membrane pressure, and its rejection and cleaning efficiency, etc. By applying the membrane into the filtration of synthesized oil/water emulsion, the membrane constantly achieved an oil rejection rate of above 99%, with a relatively constant permeate flux varied in the range of 68.9–59.0 l m −2  h −1 . More importantly, the fouling of the used membrane can be easily removed by simple water flushing. The membrane also demonstrated a wide adaptability for different types of real oily wastewater, even at very high feed oil concentration (approx. 115 000 mg l −1 in terms of chemical oxygen demand (COM)). Hence, the novel triblock copolymer additive-modified PVDF membrane can have a great prospect in the continuing effort to expand the engineering application of polymeric membranes for oily wastewater treatment.

Oil removing efficiency in oil–water separation flotation column

2014 ◽  
Vol 53 (9) ◽  
pp. 2456-2463 ◽  
Author(s):  
Hongxiang Xu ◽  
Jiongtian Liu ◽  
Yongtian Wang ◽  
Gan Cheng ◽  
Xiaowei Deng ◽  
...  
Keyword(s):  
Water Separation ◽  
Flotation Column ◽  
Oil Water Separation ◽  
Oil Water

scholarly journals Facile stearoyl chloride grafted cotton filter fabric and its application in oil-water separation

2021 ◽  
Author(s):  
Yuan He ◽  
Yejun Luo ◽  
Zheng Li ◽  
Chao Yan ◽  
Yufang Chen ◽  
...  
Keyword(s):  
Chemical Interaction ◽  
Sewage Treatment ◽  
Contact Angles ◽  
Hydroxyl Groups ◽  
Hydrophobic Membrane ◽  
Water Separation ◽  
Oil Water Separation ◽  
Oil Water ◽  
Great Possibility ◽  
Filter Fabric

Abstract Chemical graft technology has been arisen widely interesting for its stronger chemical interaction between hydrophobic layers and substrates. Instead of coating technology based on physical function, chemical graft technology can produce hydrophobic membrane with more efficient durability for oil-water separation, which is essential in various industries like sewage treatment and oil spill. As cellulose-based material, cotton filter fabric is a flexible and degradable material with abundant hydroxyl groups, providing great possibility for graft reactions. Stearyl chloride has both hydrophobic alkyl chain and active acyl group, making it easily to be grafted onto cotton filter fabrics. Therefore, we propose to use stearyl chloride as hydrophobic layer and one-step modify cotton filter fabric. The obtained hydrophobic modified cotton filter fabric exhibits high contact angles (CAmax = 147o, CAavg = 141.8o), which only decrease slightly after 5 h droplet holding time (CAmax = 141o, CAavg = 126.3o). Besides, the modified sample also shows hydrophobic durability after three times gravity-drove oil-water filtration separation (CAmax = 137o, CAavg = 132.6o). This hydrophobic modified cotton filter fabric may have potential application in future oil-water separation and the stearyl chloride graft technology is an both effective and efficient way in hydrophobic modification.

scholarly journals Polydopamine Induced Wettability Switching of Cellulose Nanofibers/n-Dodecanethiol Composite Aerogels

2022 ◽  
Vol 2022 ◽  
pp. 1-9
Author(s):  
Runan Gao ◽  
Ying Shang ◽  
Peng Jiao ◽  
Yue Jiao ◽  
Jian Li ◽  
...  
Keyword(s):  
Cellulose Nanofibers ◽  
Absorption Capacity ◽  
Water Mixture ◽  
The Novel ◽  
Water Contact ◽  
Water Separation ◽  
Composite Aerogel ◽  
Composite Aerogels ◽  
Oil Water Separation ◽  
Oil Water

The novel wettability switchable cellulose nanofiber- (CNF-) based aerogel was conveniently prepared by polydopamine mediated composition of CNF and n-dodecanethiol. The wettability of aerogels can be controlled by adjusting the PDA and n-dodecanethiol loading content, which leads to a variation of water contact angle from 0-149°. The PDA was coated on cellulose nanofibers via hydrogen bonds and then n-dodecanethiol was anchored onto the scaffolds by Michael addition reaction, which was revealed by XPS and FTIR spectra. The composite aerogel can selectively absorb a series of oily liquids from the oil/water mixture, with the maximum absorption capacity of 68 g/g. This work presented a facile strategy to prepare wettability switchable CNF-based heterogenous aerogel and exhibited the potential of the composite aerogel for oil/water separation.

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