Two-step thermoresponsive membrane with tunable separation properties and improved cleaning efficiency

Combined Sewage Detention Tanks (CSDT) are components of combined sewage systems commonly used in Germany. A lack of knowledge of the processes occurring within these structures causes the engineer to apply conceptual approaches in the simulation of pollutant transport. The investigations presented were implemented in an integrated systematic way. Extensive analytical, experimental and numerical studies of steady and transient phenomena taking place in CSDTs were carried out simulating different levels of hydraulic load. The study of the flow field and the simulation of sedimentation and erosion under realistic conditions resulted in proposals for modification and optimisation of the function of CSDTs. A simple way of predicting the cleaning efficiency is presented.

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Investigation on the effect of active-polymers with different functional groups for EOR

e-Polymers ◽

10.1515/epoly-2020-0007 ◽

2020 ◽

Vol 20 (1) ◽

pp. 61-68

Author(s):

Dong Zhang ◽

Jian Guang Wei ◽

Run Nan Zhou

Keyword(s):

Functional Groups ◽

Oil Recovery ◽

Molecular Size ◽

Type I ◽

Cleaning Efficiency ◽

Sweep Efficiency ◽

Profile Control ◽

Branched Chain ◽

Swept Volume ◽

Enhance Oil Recovery

AbstractActive-polymer attracted increasing interest as an enhancing oil recovery technology in oilfield development owing to the characteristics of polymer and surfactant. Different types of active functional groups, which grafted on the polymer branched chain, have different effects on the oil displacement performance of the active-polymers. In this article, the determination of molecular size and viscosity of active-polymers were characterized by Scatterer and Rheometer to detect the expanded swept volume ability. And the Leica microscope was used to evaluate the emulsifying property of the active-polymers, which confirmed the oil sweep efficiency. Results show that the Type I active-polymer have a greater molecular size and stronger viscosity, which is a profile control system for expanding the swept volume. The emulsification performance of Type III active-polymer is more stable, which is suitable for improving the oil cleaning efficiency. The results obtained in this paper reveal the application prospect of the active-polymer to enhance oil recovery in the development of oilfields.

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Investigation of the different particle size dust releases from rigid filter candles during pulse-jet cleaning

Proceedings of the Institution of Mechanical Engineers Part C Journal of Mechanical Engineering Science ◽

10.1177/09544062211017931 ◽

2021 ◽

pp. 095440622110179

Author(s):

Xin Luan ◽

Zhongli Ji ◽

Longfei Liu ◽

Ruifeng Wang

Keyword(s):

Particle Size ◽

Critical Role ◽

Operating Conditions ◽

Solid Particles ◽

Dust Particles ◽

Cleaning Efficiency ◽

Term Operation ◽

Cleaning Performance ◽

Experimental Apparatus ◽

Pulse Jet

Rigid filters made of ceramic or metal are widely used to remove solid particles from hot gases at temperature above 260 °C in the petrochemical and coal industries. Pulse-jet cleaning of fine dust from rigid filter candles plays a critical role in the long-term operation of these filters. In this study, an experimental apparatus was fabricated to investigate the behavior of a 2050 mm filter candle, which included monitoring the variation of pressure dynamic characteristics over time and observing the release of dust layers that allowed an analysis of the cleaning performance of ISO 12103-1 test dusts with different particle size distributions. These results showed the release behavior of these dusts could be divided into five stages: radial expansion, axial crack, flaky release, irregular disruption and secondary deposition. The cleaning performance of smaller sized dust particles was less efficient as compared with larger sized dust particles under the same operating conditions primarily because large, flaky-shaped dust aggregates formed during the first three stages were easily broken into smaller, dispersed fragments during irregular disruption that forced more particles back to the filter surface during secondary deposition. Also, a “low-pressure and long-pulse width” cleaning method improved the cleaning efficiency of the A1 ultrafine test dust from 81.4% to 95.9%.

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Thermally enhanced PBGA: Effect of heat spreader design on plasma cleaning efficiency and wire sweep

2010 12th Electronics Packaging Technology Conference ◽

10.1109/eptc.2010.5702664 ◽

2010 ◽

Author(s):

Poh-Leng Eu ◽

Ruzaini Ibrahim ◽

Kai-Yun Yow

Keyword(s):

Plasma Cleaning ◽

Cleaning Efficiency ◽

Heat Spreader

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Measurement of flow velocity profiles in tank structures using the prototype device OCM Pro LR

Water Science & Technology ◽

10.2166/wst.2011.173 ◽

2011 ◽

Vol 64 (1) ◽

pp. 263-270 ◽

Cited By ~ 2

Author(s):

K. Klepiszewski ◽

M. Teufel ◽

S. Seiffert ◽

E. Henry

Keyword(s):

Flow Velocity ◽

Large Scale ◽

Fluid Dynamic ◽

Waste Water Treatment ◽

Transport Processes ◽

Treatment Efficiency ◽

Cleaning Efficiency ◽

Cfd Modelling ◽

Ultrasonic Signals ◽

Cfd Models

Generally, studies investigating the treatment efficiency of tank structures for storm water or waste water treatment observe pollutant flows in connection with conditions of hydraulic loading. Further investigations evaluate internal processes in tank structures using computational fluid dynamic (CFD) modelling or lab scale tests. As flow paths inside of tank structures have a considerable influence on the treatment efficiency, flow velocity profile (FVP) measurements can provide a possibility to calibrate CFD models and contribute to a better understanding of pollutant transport processes in these structures. This study focuses on tests carried out with the prototype FVP measurement device OCM Pro LR by NIVUS in a sedimentation tank with combined sewer overflow (CSO) situated in Petange, Luxembourg. The OCM Pro LR measurement system analyses the echo of ultrasonic signals of different flow depths to get a detailed FVP. A comparison of flow velocity measured by OCM Pro LR with a vane measurement showed good conformity. The FVPs measured by OCM Pro LR point out shortcut flows within the tank structure during CSO events, which could cause a reduction of the cleaning efficiency of the structure. The results prove the applicability of FVP measurements in large-scale structures.

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Cleaning efficiency and impact on production fluxes of oxidising disinfectants on a pes ultrafiltration membrane fouled with proteins

Food and Bioproducts Processing ◽

10.1016/j.fbp.2010.10.005 ◽

2010 ◽

Vol 88 (4) ◽

pp. 425-429 ◽

Cited By ~ 21

Author(s):

Lydie Paugam ◽

David Delaunay ◽

Murielle Rabiller-Baudry

Keyword(s):

Ultrafiltration Membrane ◽

Cleaning Efficiency

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Mechanism of PVA Brush Loading with Ceria Particles during Post-CMP Cleaning Process

Solid State Phenomena ◽

10.4028/www.scientific.net/ssp.314.259 ◽

2021 ◽

Vol 314 ◽

pp. 259-263

Author(s):

Samrina Sahir ◽

Hwi Won Cho ◽

Nagendra Prasad Yerriboina ◽

Tae Gon Kim ◽

Satomi Hamada ◽

...

Keyword(s):

Electrostatic Attraction ◽

Particle Removal ◽

Cross Contamination ◽

Cleaning Process ◽

Particle Loading ◽

Cleaning Efficiency ◽

Solution Ph ◽

Cleaning Solution ◽

Oppositely Charged ◽

Process Interaction

Brush scrubbing is a well-known post CMP cleaning process. Interaction between PVA brush and the particles removed during the process must be considered while designing a cleaning process. In this work, the effect of cleaning solution pH was investigated in terms of particle removal from the wafer and subsequent loading to the PVA brush nodule. Higher cleaning of particles from wafer was observed for pH 2 and 12 cleaning solutions and poor cleaning for pH 7 cleaning solution. In contrast, the brushes were loaded heavily for pH 7 compared to pH 2 and 12. Higher electrostatic attraction between oppositely charged PVA and ceria surfaces provided higher ceria particles loading to PVA brush in acidic and neutral cleaning solutions. This particle loading to PVA brush can further effect cleaning efficiency as well as cross-contamination.

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Hole-Cleaning Fibers Improve Cuttings-Carrying Capacity

Journal of Petroleum Technology ◽

10.2118/0521-0063-jpt ◽

2021 ◽

Vol 73 (05) ◽

pp. 63-64

Author(s):

Chris Carpenter

Keyword(s):

Flow Regime ◽

Carrying Capacity ◽

Rheological Model ◽

Drilling Fluid ◽

Test Method ◽

Abu Dhabi ◽

Rheological Parameters ◽

Cleaning Efficiency ◽

Hole Cleaning ◽

Drilling Operations

This article, written by JPT Technology Editor Chris Carpenter, contains highlights of paper SPE 203147, “Investigating Hole-Cleaning Fibers’ Mechanism To Improve Cutting Carrying Capacity and Comparing Their Effectiveness With Common Polymeric Pills,” by Mohammad Saeed Karimi Rad, Mojtaba Kalhor Mohammadi, SPE, and Kourosh Tahmasbi Nowtarki, International Drilling Fluids, prepared for the 2020 Abu Dhabi International Petroleum Exhibition and Conference, Abu Dhabi, held virtually 9–12 November. The paper has not been peer reviewed. Hole cleaning in deviated wells is more challenging than in vertical wells because of the boycott effect or the eccentricity of the drillpipe. Poor hole cleaning can result in problems such as borehole packoff or excessive equivalent circulating density. The complete paper investigates a specialized fibrous material (Fiber 1) for hole-cleaning characteristics. The primary goal is to identify significant mechanisms of hole-cleaning fibers and their merits compared with polymeric high-viscosity pills. Hole-Cleaning Indices Based on a review of the literature, most effective parameters regarding hole cleaning in different well types were investigated. These parameters can be classified into the following five categories: - Well design (e.g., hole angle, drillpipe eccentricity, well trajectory) - Drilling-fluid properties (e.g., gel strength, mud weight) - Formation properties (e.g., lithology, cutting specific gravity, cuttings size and shape) - Hydraulic optimizations (e.g., flow regime, nozzle size, number of nozzles) - Drilling practices (e.g., drillpipe rotation speed, wellbore tortuosity, bit type, rate of penetration, pump rate) In this research, rheological parameters and parameters of the Herschel-Bulkley rheological model are considered to be optimization inputs to increase hole-cleaning efficiency of commonly used pills in drilling operations. The complete paper offers a detailed discussion of both the importance of flow regime and the role of the Herschel-Bulkley rheological model in reaching a better prognosis of drilling-fluid behavior at low shear rates. The properties of the fibrous hole-cleaning agent used in the complete paper are provided in Table 1. Test Method Two series of tests were performed. The medium of the first series is drilling water, with the goal of evaluating the efficiency of Fiber 1 in fresh pills. The second series of tests was per-formed with a simple polymeric mud as a medium common in drilling operations. Formulations and rheological properties of both test series are provided in Tables 4 and 5 of the complete paper, respectively.

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