scholarly journals Membrane Applications in the Dairy Industry

2021 ◽  
Vol 12 (4) ◽  
pp. 5012-5020
Keyword(s):  
Wastewater Treatment ◽  
Energy Demand ◽  
Membrane Separation ◽  
Dairy Industry ◽  
High Volume ◽  
Production Performance ◽  
Scientific Database ◽  
Volume Recovery ◽  
The Subject ◽  
Industrial Use

The membrane separation process is a promising technique to be employed in the dairy industry. It can be used to treat effluents and for the recovery of molecules of interest to add value to product formulations. The study aspired to present the potential industrial use of membranes for dairy industries. Detailed research for scientific articles on the subject was conducted from the Scopus® scientific database, and the use of wastewater treatment in the dairy industry has increased significantly over the years. The findings presented are expected to provide a valuable theoretical framework for producers and industries related to milk production and whose objective is to optimize production performance and expressive benefits from an economic and environmental viewpoint. Moreover, membrane-based wastewater treatment has low energy demand, high volume recovery, significant water quality, multiple applications of purified water, eco-friendly performance, and favorable future perspectives.

scholarly journals Vibratory membrane separation for wastewater treatment

2018 ◽  
Vol 14 (s1) ◽  
pp. 25-35
Author(s):  
Péter Bor ◽  
József Csanádi ◽  
Gábor Veréb ◽  
Sándor Beszédes ◽  
Zita Šereš ◽  
...  
Keyword(s):  
Wastewater Treatment ◽  
Shear Rate ◽  
Flow Rate ◽  
Specific Energy ◽  
Membrane Fouling ◽  
Energy Demand ◽  
Membrane Separation ◽  
Permeate Flux ◽  
Recirculation Flow ◽  
Shear Rates

To meet the requirements defined by environmental protection regulations effective wastewater treatment is required to process effluents before discharging them into sewers or living waters. While membrane separation offers a quite advantageous method to reduce the organic load of wastewaters, membrane fouling is still limiting its application in wastewater treatment. In this study, the possibility of membrane fouling reduction by increased shear rates on the surface of the membrane was investigated. 7 and 10 kDa MWCO ultrafiltration and 240 Da nanofiltration membranes were studied, with the use of a laboratory mode Vibratory Shear Enhanced Processing. This work mostly focused on studying the effects of module vibration and recirculation feed flow rate on permeate flux, specific energy demand and membrane rejections. Using the same operation parameters, vibration and non-vibration mode experiments were carried out with high and low recirculation flow rate to have a deeper understanding of the shear rate effects. It can be concluded that higher shear rate had a positive effect on the process: increased shear rate resulted in higher flux, higher overall rejection values, as well as a significantly decreased specific energy demand. By calculating and comparing the shear rates in experiments with different operating parameters, both vibration and nonvibration mode, both low and high recirculation flow rate, we have reached the conclusion that vibration causes a significantly higher shear rate increase than setting the recirculation flow rate high.

Floc size distribution and bacterial activities in membrane separation activated sludge processes for small-scale wastewater treatment/reclamation

1997 ◽  
Vol 35 (6) ◽  
pp. 37-44 ◽  
Author(s):  
Boran Zhang ◽  
Kazuo Yamamoto ◽  
Shinichiro Ohgaki ◽  
Naoyuki Kamiko
Keyword(s):  
Wastewater Treatment ◽  
Activated Sludge ◽  
Municipal Wastewater ◽  
Membrane Separation ◽  
Small Scale ◽  
Nitrification Rate ◽  
Floc Size ◽  
Denitrification Activity ◽  
Concentration Changes ◽  
Activated Sludge Processes

Activated sludges taken from full-scale membrane separation processes, building wastewater reuse system (400m3/d), and two nightsoil treatment plants (50m3/d) as well as laboratory scale membrane separation bioreactor (0.062m3/d) were analyzed to characterize membrane separation activated sludge processes (MSAS). They were also compared with conventional activated sludges(CAS) taken from municipal wastewater treatment plants. Specific nitrification activity in MSAS processes averaged at 2.28gNH4-N/kgMLSS.h were higher than that in CAS processes averaged at 0.96gNH4-N/kgMLSS.h. The denitrification activity in both processes were in the range of 0.62-3.2gNO3-N/kgMLSS.h without organic addition and in the range of 4.25-6.4gNO3-N/kgMLSS.h with organic addition. The organic removal activity in nightsoil treatment process averaged at 123gCOD/kgMLSS.h which was significantly higher than others. Floc size distributions were measured by particle sedimentation technique and image analysis technique. Flocs in MSAS processes changed their sizes with MLSS concentration changes and were concentrated at small sizes at low MLSS concentration, mostly less than 60 μm. On the contrary, floc sizes in CAS processes have not much changed with MLSS concentration changes and they were distributed in large range. In addition, the effects of floc size on specific nitrification rate, denitrification rate with and without organic carbon addition were investigated. Specific nitrification rate was decreased as floc size increased. However, little effect of floc size on denitrification activity was observed.

scholarly journals Integrated Approach for Wastewater Treatment and Biofuel Production in Microalgae Biorefineries

Energies ◽  
2021 ◽  
Vol 14 (8) ◽  
pp. 2282
Author(s):  
Sanjeet Mehariya ◽  
Rahul Kumar Goswami ◽  
Pradeep Verma ◽  
Roberto Lavecchia ◽  
Antonio Zuorro
Keyword(s):  
Wastewater Treatment ◽  
Energy Demand ◽  
Energy Production ◽  
Effective Means ◽  
Integrated Approach ◽  
Biofuel Production ◽  
World Population ◽  
Treatment Processes ◽  
Current Scenario ◽  
Valuable Compounds

The increasing world population generates huge amounts of wastewater as well as large energy demand. Additionally, fossil fuel’s combustion for energy production causes the emission of greenhouse gases (GHG) and other pollutants. Therefore, there is a strong need to find alternative green approaches for wastewater treatment and energy production. Microalgae biorefineries could represent an effective strategy to mitigate the above problems. Microalgae biorefineries are a sustainable alternative to conventional wastewater treatment processes, as they potentially allow wastewater to be treated at lower costs and with lower energy consumption. Furthermore, they provide an effective means to recover valuable compounds for biofuel production or other applications. This review focuses on the current scenario and future prospects of microalgae biorefineries aimed at combining wastewater treatment with biofuel production. First, the different microalgal cultivation systems are examined, and their main characteristics and limitations are discussed. Then, the technologies available for converting the biomass produced during wastewater treatment into biofuel are critically analyzed. Finally, current challenges and research directions for biofuel production and wastewater treatment through this approach are outlined.

SPECIALIZATION OF GRAIN PRODUCTION BY ZONE IN THE REPUBLIC OF BASHKORTOSTAN

2021 ◽  
Vol 0 (3) ◽  
pp. 45-49
Author(s):  
S.SH. ASLAEVA ◽  
◽  
R.F. GATAULLIN ◽  
Keyword(s):  
High Volume ◽  
Forest Steppe ◽  
Grain Production ◽  
Natural Conditions ◽  
Main Condition ◽  
Republic Of Bashkortostan ◽  
General Scientific ◽  
The Subject ◽  
The Russian Federation ◽  
The Republic

The main condition for specialization in agriculture is the production of those products for which there is the most favorable natural environment. The purpose of our study is to determine the nature of territorial specialization in grain production based on the level and its dynamics. The object of the research is the agriculture of the Republic of Bashkortostan, which is one of the leading in the Russian Federation. The subject of the research is the factors of formation of territorial specialization of grain production. The work was carried out on the basis of the application of general scientific research methods within the framework of comparative, logical, statistical analysis and graphic interpretation of the results. The territory of the Republic of Bashkortostan is divided according to the complex of natural conditions, respectively, and according to the peculiarities of agriculture, into six zones. We have grouped municipal districts according to the volume of grain production in statics and in dynamics. A map of the municipal districts of the Republic of Bashkortostan for the production of grain by agricultural zones has been built. It was revealed that the dynamics of grain production in the republic has a multidirectional character. In terms of grain production, many regions of the region are promising territories, which, despite the low volume of production, are characterized by positive dynamics, as well as stagnant territories, which are characterized, despite the high volume of production, by negative dynamics. Areas in which grain production is higher than the average for the region are located in agricultural zones belonging to the Southern forest-steppe, the Ural steppe, and the Trans-Ural steppe. But at the same time, in many areas of the Cis-Ural and Trans-Ural steppe, grain production is also increasing, many of them have grain-growing specialization. In the regions located in the southern forest-steppe, grain production is below the average level in the republic, sunflower is most of all cultivated. Agriculture in the republic must be developed in the direction of creating specialized zones, which will allow lower costs to ensure the growth of production. At the same time, the organizational and economic mechanism must change in such a way as to stimulate the specialization and concentration of production.

Ultrafiltration membrane separation for anaerobic wastewater treatment

1994 ◽  
Vol 30 (12) ◽  
pp. 321-327 ◽  
Author(s):  
Ahmadun Fakhru'l-Razi
Keyword(s):  
Wastewater Treatment ◽  
Membrane Separation ◽  
Organic Loading Rate ◽  
Organic Loading ◽  
Reactor Performance ◽  
Water And Wastewater Treatment ◽  
Active Biomass ◽  
Biomass Loss ◽  
Scientists And Engineers ◽  
Uf Membranes

Membrane technology has attracted a lot of attention from scientists and engineers in recent years as a new separation process. Various membrane technologies such as reverse osmosis (RO), ultrafiltration (UF) and microfiltration (MF) have been successfully used for a variety of water and wastewater treatment applications. In this study UF membranes of 10 000 nominal molecular weight limit were used in conjunction with an anaerobic reactor to treat wastewater from a brewery. The UF membranes serve to retain active biomass in the reactor, which is essential for a good reactor performance and for the production of a clear final effluent. The reactor was operated over a range of hydraulic retention times and organic loading rates (OLR) in order to evaluate its treatment efficiency. Six steady states were attained over a range of mixed liquor suspended solids (31 000-38 000 mg 1−1). The maximum organic loading rate applied was 19.7 kg COD m−3 d−1 resulting in a methane yield of 0.27 1 CH4 g−1 COD. The percentages of COD removal achieved were above 96%. The results indicated that the UF membranes were capable of efficient biomass-effluent separation thus preventing any biomass loss from the reactor and have potential for treating industrial wastewaters.

scholarly journals Eucalyptus sp. WOODCHIP POTENTIAL FOR INDUSTRIAL THERMAL ENERGY PRODUCTION1

2017 ◽  
Vol 41 (6) ◽  
Author(s):  
Marcos Antonio da Silva Miranda ◽  
Gabriel Browne de Deus Ribeiro ◽  
Sebastião Renato Valverde ◽  
Crismeire Isbaex
Keyword(s):  
Energy Source ◽  
Thermal Energy ◽  
Fossil Fuels ◽  
Forest Biomass ◽  
Dairy Industry ◽  
Industrial Sector ◽  
Cost Ratio ◽  
Planted Forests ◽  
Industrial Use ◽  
The Cost

ABSTRACT The main objective of this work was to identify and analyze the potential of forest biomass of Eucalyptus sp. such as thermal energy source for industrial use in place of fossil fuels. Two cases were analyzed: the first one estimated the total demand for forest biomass to replace the main fossil fuels in Brazilian industrial sector, with scenarios of 100, 75 and 50% replacement; in the second, it was calculated the cost of each fuel for producing ton of industrial steam (thermal energy) for a dairy industry, in order to verify the competitiveness of forest biomass compared to fossil fuels. The results showed that the areas demanded to replace 100, 75 and 50% of the analyzed fossil fuels were, respectively, 2.9, 2.2 and 1.5 million planted forests hectares, and the steam ton cost ratio using the woodchips was at least 34% lower than with other fuels, which corroborates the substitution potential in this sector.

scholarly journals Convective forces increase rostral delivery of intrathecal antisense oligonucleotides in the cynomolgus monkey nervous system

2020 ◽  
Author(s):  
Jenna M. Sullivan ◽  
Curt Mazur ◽  
Daniel A. Wolf ◽  
Laura Horky ◽  
Nicolas Currier ◽  
...  
Keyword(s):  
Antisense Oligonucleotides ◽  
Ex Vivo ◽  
High Volume ◽  
Radioactive Tracer ◽  
Direct Access ◽  
Cynomolgus Monkeys ◽  
Added Benefit ◽  
The Subject ◽  
Dose Volumes ◽  
Tracer Molecules

ABSTRACTBackgroundThe intrathecal (IT) dosing route introduces drugs directly into the CSF to bypass the blood-brain barrier and gain direct access to the CNS. We evaluated the use of convective forces acting on the cerebrospinal fluid as a means for increasing rostral delivery of IT dosed radioactive tracer molecules and antisense oligonucleotides (ASO) in the monkey CNS. We also measured the cerebral spinal fluid (CSF) volume in a group of cynomolgus monkeys.MethodsThere are three studies presented, in each of which cynomolgus monkeys were injected into the IT space with radioactive tracer molecules and/or ASO by lumbar puncture in either a low or high volume. The first study used the radioactive tracer 64Cu-DOTA and PET imaging to evaluate the effect of the convective forces. The second study combined the injection of the radioactive tracer 99mTc-DTPA and ASO, then used SPECT imaging and ex vivo tissue analysis of the effects of convective forces to bridge between the tracer and the ASO distributions. The third experiment evaluated the effects of different injection volumes on the distribution of an ASO. In the course of performing these studies we also measured the CSF volume in the subject monkeys by Magnetic Resonance Imaging.ResultsIt was consistently found that larger bolus dose volumes produced greater rostral distribution along the neuraxis. Thoracic percussive treatment also increased rostral distribution of low volume injections. There was little added benefit on distribution by combining the thoracic percussive treatment with the high-volume injection. The CSF volume of the monkeys was found to be 11.9 ± 1.6 cm3.ConclusionsThese results indicate that increasing convective forces after IT injection increases distribution of molecules up the neuraxis. In particular, the use of high IT injection volumes will be useful to increase rostral CNS distribution of therapeutic ASOs for CNS diseases in the clinic.

Membrane Separation Coupled with Photocatalysis for Water Supply and Wastewater Treatment

2013 ◽  
Vol 671-674 ◽  
pp. 2571-2574 ◽  
Author(s):  
Zhi Yang Wang ◽  
Ling Wang ◽  
Lin Fei Yao ◽  
Mei Le Pei ◽  
Guo Liang Zhang
Keyword(s):  
Wastewater Treatment ◽  
Water Supply ◽  
Membrane Reactor ◽  
Membrane Separation ◽  
Hybrid Technology ◽  
The Past ◽  
Continuous Running ◽  
Photocatalytic Membrane Reactor

Membrane separation coupled with photocatalysis process, which is also called photocatalytic membrane reactor (PMR), is a new hybrid technology working for water supply and wastewater treatment. Due to some unique advantages, such as nontoxic and continuous running, this kind of novel coupling systems has developed rapidly in the past few years. In this work, the characteristic and structure of configurations, photocatalysts and membranes are analyzed briefly.

scholarly journals Study of Chromium Removal by the Electrodialysis of Tannery and Metal-Finishing Effluents

2012 ◽  
Vol 2012 ◽  
pp. 1-7 ◽  
Author(s):  
Ruan C. A. Moura ◽  
Daniel A. Bertuol ◽  
Carlos A. Ferreira ◽  
Franco D. R. Amado
Keyword(s):  
Wastewater Treatment ◽  
Ion Exchange ◽  
Electric Field ◽  
Driving Force ◽  
Membrane Separation ◽  
Physicochemical Process ◽  
Separation Technique ◽  
Chromium Removal ◽  
Metal Finishing ◽  
Interesting Alternative

The metal-finishing and tannery industries have been under strong pressure to replace their current wastewater treatment based on a physicochemical process. The electrodialysis process is becoming an interesting alternative for wastewater treatment. Electrodialysis is a membrane separation technique, in which ions are transported from one solution to another through ion-exchange membranes, using an electric field as the driving force. Blends of polystyrene and polyaniline were obtained in order to produce membranes for electrodialysis. The produced membranes were applied in the recovery of baths from the metal-finishing and tannery industries. The parameter for electrodialysis evaluation was the percentage of chromium extraction. The results obtained using these membranes were compared to those obtained with the commercial membrane Nafion 450.

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