scholarly journals RECOVERY OF WASTE OINTMENTS BY ULTRAFILTRATION METHOD

2021 ◽  
pp. 75-83
Author(s):  
Yuliya Melnyk ◽  
Andriy Melnyk
Keyword(s):  
Small Volume ◽  
Membrane Filter ◽  
Free Water ◽  
Filter Element ◽  
Metal Mesh ◽  
Filtration Process ◽  
Batch Mode ◽  
Pass Through ◽  
Degree Of Purification

Ultrafiltration devices are currently being developed and manufactured around the world, and productivity varies greatly from 1 to 300,000 m/day. In practice, ultrafiltration parameters are used and performed in batch, semi-periodic and continuous modes. Continuous and semi-periodic modes are mainly used for large volumes of liquids. In the case of a small volume, the batch mode prefers the continuous mode - the area of the membrane is smaller and it is easier to clean. The deposition of spent grease is based on the fact that mechanical impurities and water are in a suspended state and settle over time. When selecting the process of restoring the quality of the lubricant to the required level, first use a mechanical cleaning method to remove free water and hard dirt. In practice, rough cleaning of the lubricant is carried out using filter elements made of metal mesh with a filtration fineness of 60 ... 80 μm. A complex filter element made of non-woven materials is used for fine cleaning. Type of oil filter "FMN" (cleaning accuracy 15 ... 20 microns). However, these filters cannot provide a degree of purification of the spent lubricant, as the latter contains a large amount of carbon contaminants, preferably with a particle size of less than 5 μm. In the process of ultrafiltration of oil, the initial stream is separated and concentrated. Varnish, resin and other small contaminants are retained by the superporous layer on the surface and are continuously washed away by a tangential flow of purified oil. Only cleaned grease can pass through the membrane. This allows for a long filtration process without replacing the membrane filter element. The ultrafiltration process is performed at a pressure of 0.3-1 MPa and a flow rate of 2-5 m/s, using membranes with a size of 0.1-0.005 μm.

High Rate Anaerobic Digestion of Wool Scouring Wastewater in a Digester Combined with Membrane Filter

1992 ◽  
Vol 25 (7) ◽  
pp. 341-350 ◽  
Author(s):  
A. Hogetsu ◽  
T. Ishikawa ◽  
M. Yoshikawa ◽  
T. Tanabe ◽  
S. Yudate ◽  
...  
Keyword(s):  
Wastewater Treatment ◽  
Anaerobic Digestion ◽  
Loading Rate ◽  
Membrane Filter ◽  
High Rate ◽  
Flux Rate ◽  
Anaerobic Process ◽  
Recirculation System ◽  
Pass Through

The performance and sludge diminution property in wool scouring wastewater treatment of an anaerobic process in combination with an ultrafiltration membrane (UFM) was evaluated. With regard to TOD removal, both mesophilic (37°C) and thermophilic (53°C) digestion, without UFM, showed the same trend of decreasing sharply from about 90 % to 30 % in proportion to the increasing TOD loading rate from 3 to 45 kg/m3· d. When a digester was provided at the effluent line of a reactor with UFM separator, about two times higher concentration of biomass was retained and the quality of the effluent improved remarkably due to better filtration. TOD and grease removal improved remarkably from 45 to 90 % and 37 to 99 % respectively, at a TOD loading rate of 15 kg/m3 · d in both fermentative temperatures. Further, the effective recirculation system of rejected liquid from UFM was studied to diminish the quantity of sludge generated. The study revealed that 33 % of the incoming SS was biodegraded under the recirculation system for rejected liquid from UFM to reactor, while 17 % was achieved in one pass through the system at the same TOD loading rate. Deterioration in the flux rate of UFM was observed for the first 40 days of operation from 37 to 23 l/m2 · h which then gradually decreased to 17 l/m2 · h after 210 days of service.

scholarly journals Pyrite (FeS2)-supported ultrafiltration system for removal of mercury (II) from water

2021 ◽  
Author(s):  
Dong Suk Han ◽  
Kawsher M. D. Solayman ◽  
Ho Kyong Shon ◽  
Ahmed Abdel-Wahab
Keyword(s):  
Membrane Filter ◽  
Pyrite Surface ◽  
Ph Change ◽  
Filtration Process ◽  
Sem Images ◽  
Flux Decline ◽  
Cake Layer ◽  
Water Effects ◽  
Almost All ◽  
Over Time

AbstractThis study investigated the Hg(II) removal efficiencies of the reactive adsorbent membrane (RAM) hybrid filtration process, a removal process that produces stable final residuals. The reaction mechanism between Hg(II) and pyrite and the rejection of the solids over time were characterized with respect to flux decline, pH change, and Hg and Fe concentration in permeate water. Effects of the presence of anions (Cl−, SO42−, NO3−) or humic acid (HA) on the rejection of the Hg(II)-contacted pyrite were studied. The presence of both HA and Hg(II) increased the rate of flux decline due to the formation of irreversible gel-like compact cake layers as shown in the experimental data and modeling related to the flux decline and the SEM images. Stability experiments of the final residuals retained on the membrane using a thiosulfate solution (Na2S2O3) show that the Hg(II)-laden solids were very stable due to little or no detection of Hg(II) in the permeate water. Experiment on the possibility of continuously removing Hg(II) by reusing the Hg/pyrite-laden membrane shows that almost all Hg(II) was adsorbed onto the pyrite surface regardless of the presence of salts or HA, and the Hg(II)-contacted pyrite residuals were completely rejected by the DE/UF system. Therefore, a membrane filter containing pyrite-Hg(II) could provide another reactive cake layer capable of further removal of Hg(II) without post-chemical treatment for reuse.

Characteristics of p-chlorophenol degradation by Photo Fenton oxidation

2000 ◽  
Vol 42 (3-4) ◽  
pp. 219-224 ◽  
Author(s):  
J. Yoon ◽  
S. Kim ◽  
D.S. Lee ◽  
J. Huh
Keyword(s):  
Degradation Kinetics ◽  
Decomposition Kinetics ◽  
Fenton Oxidation ◽  
Oh Radical ◽  
Mercury Lamp ◽  
Batch Mode ◽  
Specific Objective ◽  
Initial Ph

This study investigated the characteristics of Photo Fenton oxidation in comparison with Fenton oxidation in dark environments. The specific objective was to provide an in-depth understanding as to how the presence of UV would effect the reaction and its efficiency as compared to the Dark Fenton Oxidation. All reactions were carried out in batch mode at an initial pH of 3.5, with H2O2 in excess and iron in catalytic concentrations. The medium pressure mercury lamp (320-400 nm) was used as a UV source. The role of UV in Photo Fenton Oxidation of p-chlorophenol was found to be manyfold as compared to Dark Fenton Oxidation. It included the expedition of ferric ion reduction and the photolysis of H2O2, which exerted a direct impact on the p-chlorophenol degradation kinetics by enhancing the production of OH radical. Also included in the role was alteration of the quantity (and potentially quality) of intermediates, which would lead to a change in the decomposition kinetics in an indirect manner. Therefore, it was concluded that the performance of Photo Fenton Oxidation as compared to Dark Fenton Oxidation could vary in complicated ways depending upon the characteristics of target compounds and their intermediates.

The Microbiological Quality of Honey as Determined by Aerobic Colony Counts

1993 ◽  
Vol 56 (4) ◽  
pp. 336-337 ◽  
Author(s):  
JOSEP SERRA BONVEHI ◽  
ROSSEND ESCOLÁ JORDÁ
Keyword(s):  
Membrane Filter ◽  
Microbiological Quality ◽  
Plate Count ◽  
Filter Method ◽  
Filter Methods ◽  
Plate Counts ◽  
Multifloral Honey ◽  
Plate Count Method ◽  
Membrane Filter Method

The number of mesophilic aerobic colonies was determined in 72 samples of mono- and multifloral honey from various sources by the plate count and the membrane filter methods. The presence of motile colonies made the plate counts unreliable. The microorganism producing these colonies was identified as Bacillus alvei. Colony counts could only be carried out in 27 of the samples when using the plate count method, while with the membrane filter method the number of colonies was counted in all the samples.

scholarly journals PDCA Cycle Application in the Beer Filtration Process

2019 ◽  
Vol 7 (11) ◽  
pp. 506-516
Author(s):  
Wander Oliveira Avinte ◽  
David Barbosa de Alencar ◽  
Alexandra Priscilla Tregue Costa ◽  
Antônio Estanislau Sanches
Keyword(s):  
Sensory Quality ◽  
Premature Aging ◽  
Raw Material ◽  
Filtration Process ◽  
Process Stage ◽  
Pdca Cycle ◽  
Continuous Application ◽  
Brewing Process ◽  
Reducing Costs

The brewing process requires that the manufacturing of your product be done and controlled in such a way that the entire characteristic of the product is preserved from receipt of raw material to finished product. Thus, this work aims to propose actions that allow identifying possible critical steps of oxygen increases during the beer filtration process. Using the PDCA cycle methodology to analyze possible failures, be it people, management or equipment, and seek improvements through the analysis and monitoring of objective actions capable of identifying and addressing all problems at the process stage, thus ensuring, improving the sensory quality of beer and producing with, lower dissolved oxygen content. The PDCA cycle will be used because it is a sequence of activities that are cyclically performed to improve activities and continuous application and allows a real use of the processes generated in the company, aiming at reducing costs and increasing productivity. Therefore, the scientific problem of this work refers to the evaluation of points of the manufacturing process that causes premature aging and oxidation in the produced beers.

A Multi-Level Analysis of the Change in Teaching Methods in Post-Communist Romania

2013 ◽  
pp. 181-203
Author(s):  
Oana Gauca
Keyword(s):  
Critical Thinking ◽  
Teaching Methods ◽  
Intellectual Development ◽  
Student Work ◽  
Multi Level ◽  
Pass Through ◽  
Post Communism ◽  
The Impact ◽  
Level Analysis

The chapter provides an overview of the changes suffered by the secondary and higher education systems in the communism to post-communism transition and discusses the transformation of the teaching methods and the impact of these transformations. Most teachers aspire to make critical thinking the main objective of their instruction; most of them do not realize that to develop as thinkers students must pass through stages of development in critical thinking. The conclusions point to the fact that most teachers are unaware of the levels of intellectual development that students go through as they improve as thinkers. The research shows that significant gains in the intellectual quality of student work will not be achieved if teachers do not recognize that skilled critical thinking develops only if properly cultivated and only through predictable stages.

scholarly journals Siphon-Induced Droplet Break-Off for Enhanced Mixing on a Centrifugal Platform

Inventions ◽  
2019 ◽  
Vol 5 (1) ◽  
pp. 1 ◽  
Author(s):  
Robert Burger ◽  
David J Kinahan ◽  
Hélène Cayron ◽  
Nuno Reis ◽  
João Fonseca ◽  
...  
Keyword(s):  
Human Plasma ◽  
Spectroscopic Method ◽  
Colorimetric Method ◽  
Phosphate Buffer Solution ◽  
Potassium Thiocyanate ◽  
Single Step ◽  
Buffer Solution ◽  
Batch Mode ◽  
Two Fluids ◽  
Pass Through

We present a powerful and compact batch-mode mixing and dilution technique for centrifugal microfluidic platforms. Siphon structures are designed to discretize continuous flows into a sequence of droplets of volumes as low as 100 nL. Using a passive, self-regulating 4-step mechanism, discrete volumes of two fluids are alternatingly issued into a common intermediate chamber. At its base, a capillary valve acts as a fluidic shift register; a single droplet is held in place while two or more droplets merge and pass through the capillary stop. These merged droplets are advectively mixed as they pass through the capillary valve and into the receiving chamber. Mixing is demonstrated for various combinations of liquids such as aqueous solutions as well as saline solutions and human plasma. The mixing quality is assessed on a quantitative scale by using a colorimetric method based on the mixing of potassium thiocyanate and iron(III) chloride, and in the case of human plasma using a spectroscopic method. For instance, volumes of 5 µL have been mixed in less than 20 s. Single-step dilutions up to 1:5 of plasma in a standard phosphate buffer solution are also demonstrated. This work describes the preliminary development of the mixing method which has since been integrated into a commercially available microfluidic cartridge.

scholarly journals Risk analysis in drinking water accumulation

2010 ◽  
Vol 28 (No. 6) ◽  
pp. 557-563 ◽  
Author(s):  
J. Říhová Ambrožová ◽  
J. Říha ◽  
J. Hubáčková ◽  
I. Čiháková
Keyword(s):  
Drinking Water ◽  
Free Water ◽  
Distribution Networks ◽  
Negative Influence ◽  
Water Reservoirs ◽  
Haccp System ◽  
Drinking Water Production ◽  
Water Accumulation

Drinking water is safe water, from the perspective of long-term use is does not cause any disease, pathogenic and hygienically unsafe microorganisms do not spread in it and customers enjoy its consumption. Drinking water is regarded as a foodstuff, therefore the known HACCP system can be used in the control system which can be applied not only directly to the final product, but also to the whole system of drinking water production, distribution, and accumulation. Even if there is no problem concerning the water processing and the technological line is well adjusted, the quality of drinking water is subsequently deteriorated by its transportation and accumulation. The condition and character of the operated distribution network and reservoirs are significantly and substantially related to the maintenance of the biological stability and quality of drinking water. This is well confirmed by biological audits of the distribution networks and water reservoirs. A significant fact is the negative influence of the secondary contamination by air in the reservoir facilities and the occurrence of microorganisms (fungi, bacteria) in free water and in biofilms. The findings obtained in the framework of biological audits were so alarming that the outputs of biological audits contributed to the reconsideration of the efficiency of the standard for the construction and design of water reservoirs and pointed out the necessity of its review.

Quality of meat from three muscles of farmed fallow deer (Dama dama)

2018 ◽  
Vol 58 (2) ◽  
pp. 376 ◽  
Author(s):  
Marta Bykowska ◽  
Marek Stanisz ◽  
Agnieszka Ludwiczak ◽  
Joanna Składanowska ◽  
Piotr Ślósarz
Keyword(s):  
Crude Protein ◽  
Dry Matter ◽  
Free Water ◽  
Fallow Deer ◽  
Dama Dama ◽  
Protein Ratio ◽  
Duration Of Storage ◽  
Colour Parameters ◽  
Technological Quality

The quality of three muscles (supraspinatus, longissimus, semimembranosus) were studied in a group of 12 farmed fallow deer bucks (Dama dama) aged 28 months. The aim was to compare the selected quality traits of these muscles and to assess the extent to which these traits change after 14 days of being stored in vacuum packaging. Both the pH and the temperature were significantly affected by the muscle (P < 0.0001) and the time of storage (P < 0.0001). The supraspinatus muscle had the highest initial and final pH (pH0.5 h = 6.95; pH15d = 5.93), while m. semimembranosus showed the greatest drop in temperature (by 37.5°C) 24 h postmortem. The colour parameters differed among muscles. Only lightness (L*) was not influenced by the duration of storage (P = 0.081). The 14-day storage in a vacuum bag caused a decrease in the drip loss (P = 0.002), free water (%; P = 0.001), free water (cm2; P < 0.0001) and a cooking loss (P = 0.050). The duration of time in storage caused an increase in the dry-matter (P = 0.049) and crude-protein (P = 0.044) contents and a decrease of the water to protein ratio (W : CP; P = 0.014). There was a significant effect of muscle on the dry-matter (P < 0.0001) and crude-protein (P < 0.001) contents and W : CP (P < 0.0001). The highest contents of dry matter (P ≤ 0.01) and crude protein (P ≤ 0.01) were found in m. longissimus. The highest W : CP was observed in m. supraspinatus (W : CP24 h = 4.02; W/CP15d = 3.92). The results indicated a different technological quality of the analysed muscles, and, thus, a need to further explore the background of these differences in the early postmortem period and after meat maturation.

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