Improving pollutant removal and membrane performance via pre-treatment with a specific formulation of polysilicato-iron

2011 ◽  
Vol 34 (1-3) ◽  
pp. 106-111 ◽  
Author(s):  
Thuy Tran ◽  
Manh Hoang ◽  
Tuan Duong ◽  
Brian Bolto
Keyword(s):  
Pollutant Removal ◽  
Membrane Performance ◽  
Pre Treatment ◽  
Specific Formulation

scholarly journals Purification of Model Dairy Wastewaters by Ozone, Fenton Pre-treatment and Membrane Filtration

2020 ◽  
Vol 64 (3) ◽  
pp. 357-363 ◽  
Author(s):  
Mihály Zakar ◽  
Dániel Imre Farkas ◽  
Erika Hanczné Lakatos ◽  
Gábor Keszthelyi-Szabó ◽  
Zsuzsanna László
Keyword(s):  
Protein Separation ◽  
Membrane Filtration ◽  
Separation Efficiency ◽  
Dominant Role ◽  
Sodium Caseinate ◽  
Pollutant Removal ◽  
Ion Concentration ◽  
Fenton Reagents ◽  
Pre Treatment ◽  
Flocculation Effect

This study aimed to investigate the effect of ozone and Fenton-reaction as a pre-treatment before ultrafiltration of model dairy waste waters containing sodium caseinate. Filtration resistances and pollutant retentions were determined and compared. It was found, that both pre-treatment increased the retention, achieving almost 100 % pollutant elimination efficiency after short term pre-oxidation. The effect of Fe-ion concentration on Fenton pretreatment efficiency also was examined, and it was found that higher concentration resulted in decreased filtration resistances, revealing that coagulation-flocculation effect of reactants has dominant role in the protein separation efficiency. The presence of lactose also affects the pollutant removal efficiency, it promotes fouling in presence of Fenton reagents.

scholarly journals In-line coagulation assessment for ultrafiltration fouling reduction to treat secondary effluent for water reuse

2020 ◽  
Author(s):  
Samia A. Aly ◽  
William B. Anderson ◽  
Peter M. Huck
Keyword(s):  
Membrane Fouling ◽  
Water Reuse ◽  
Hollow Fiber Membrane ◽  
Secondary Effluent ◽  
Membrane Performance ◽  
Coagulant Dosage ◽  
Pre Treatment ◽  
Uf Membranes ◽  
Fouling Reduction ◽  
The Impact

Abstract Low pressure membranes are attracting attention for their potential to improve secondary effluent quality, but membrane fouling can limit their widespread applicability. In this study, in-line coagulation as pre-treatment to ultrafiltration (UF) was investigated using a bench-scale hollow fiber membrane at a constant flux of 33 L/m2 h. Membrane fouling was monitored by observing change in trans-membrane pressure when the membrane was fed with secondary effluent and in-line coagulated secondary effluent over a 24-h period. The impact of four coagulants at different dosages on reversible and irreversible membrane fouling and permeate quality was studied. It was found that in-line coagulation improved UF performance to varying degrees depending on coagulant type and dosage. Generally, higher reduction of fouling was achieved by increasing coagulant dosage within the 0.5–5.0 mg/L range investigated. Ferric-based coagulants were better than aluminum-based coagulants with respect to improving membrane performance for the secondary effluent investigated, even at low dosages (0.5 mg/L). Further investigations are required to determine how in-line coagulation affects removal of organic compounds through UF membranes.

scholarly journals Challenges in Membrane Process for Gas Separation from Natural Gas

2021 ◽  
Vol 25 (2) ◽  
pp. 89-105
Author(s):  
K. Farahdila ◽  
P. S. Goh ◽  
A. F. Ismail ◽  
N. F. W. M. Wan ◽  
H. M. H. Mohd ◽  
...  
Keyword(s):  
Natural Gas ◽  
Cost Effective ◽  
Operating Conditions ◽  
Competitive Sorption ◽  
Co2 Removal ◽  
Membrane Performance ◽  
Selective Membrane ◽  
Proper Design ◽  
Pre Treatment ◽  
Aging Phenomena

Membrane technology is cost effective solution for CO2 removal from natural gas. However, there is challenges during its application depending on the polymer material characteristic. Understanding on the polymer fundamental and transport properties, will enable proper design of pre-treatment and operating conditions that suits its capability envelope. Diffusivity selective membrane favors high pressure and high temperature conditions and vice versa for solubility selective polymer. On top of that, the robustness and durability of the resultant membrane, need to be evaluated with multicomponent mixture to understand the effect of competitive sorption, plasticization and aging phenomena that will seriously impacting the membrane performance during its application.

scholarly journals Dewatering e bonifica dell’ area ˝ex Whitehead Motofides˝ (Pisa, Italia)

2014 ◽  
Vol 3 (4) ◽  
Author(s):  
Nicola Conti ◽  
Roberto Salvadori ◽  
Massimo Aiello
Keyword(s):  
Treatment Plant ◽  
Pollutant Removal ◽  
Organic Substances ◽  
Groundwater Treatment ◽  
Physical Chemical ◽  
Dry Conditions ◽  
Pre Treatment ◽  
Set Up ◽  
Iron Manganese ◽  
Soil Excavation

In 2007 the activities for the remediation of the “ex-Whitehead Motofides area” (in Marina di Pisa, Italy) started. In order to allow the contaminated soil excavation in dry conditions a dewatering system was necessary. The water pumped through this system was then treated in an adequate plant. Acque Industriali realized and managed the whole system. The dewatering system was made of suction pins fixed to a depth of 5.5 m, connected by a junction manifold to the suction and booster vacuum assisted pump, which allowed the groundwater release toward the plant. The treatment plant, entirely designed by Acque Industriali and called ITAM (Impianto di Trattamento Acque di Falda Mobile, which means movable groundwater treatment), was realized and set up at the end of 2008. It consisted of a pre-treatment section, made of reinforced concrete, prefabricated nitrogen sweep elements, and a physical chemical treatment plant, in a continuous loop, completely made on skid. The plant, with 25 m3/h of maximum potential, was able to remove possible sedimentable or in suspension material particles from water, iron, manganese, residual organic substances such as hydrocarbons, solvents (chlorinated and not), PCBs, and partly heavy metals. Totally, 98,167 m3 of groundwater were managed in about 25 months of activity. The analytic input and output results confirmed extremely high and satisfactory pollutant removal efficiency. The concentration values of the pollutants, in fact, were always lower than the limits imposed by law.

scholarly journals Impact of granular filtration on ultrafiltration membrane performance as pre-treatment to seawater desalination in presence of algal blooms

2017 ◽  
Vol 8 (2) ◽  
pp. 262-277 ◽  
Author(s):  
Nour-Eddine Sabiri ◽  
Véronique Séchet ◽  
Pascal Jaouen ◽  
Maxime Pontié ◽  
Anthony Massé ◽  
...  
Keyword(s):  
Algal Blooms ◽  
Peak Pressure ◽  
Retention Rate ◽  
Removal Rate ◽  
Algal Cell ◽  
Reduction Rate ◽  
Mean Velocity ◽  
Membrane Performance ◽  
Pre Treatment ◽  
Granular Filtration

Abstract To mitigate fouling of the ultrafiltration (UF) membrane and improve permeate quality, we coupled granular filters (GF) with UF membrane as a pre-treatment for reconstituted seawater in the presence of algal bloom. Mono and bilayer granular filtrations were led at a mean velocity of 10 m h−1 over a 7-hour period. Both GF gave the same algal cell retention rate (∼63%) after 7 hours of filtration. Turbidity reduction rate was 50% for the monolayer filter and 75% for the bilayer filter. Resulting organic matter removal rate was 10% for the monolayer filter and 35% for the bilayer filter. Dissolved organic carbon removal was low (20%) with the bilayer filter and non-existent with the monolayer filter. GF-coupled UF reduced humic acids in the permeate (20%) compared with UF alone. Peak pressure of 3 bars was reached at the end of 30 minutes of UF in both direct UF or UF after monolayer GF. The filtrate from the bilayer GF enables UF over a longer period (7 hours).

scholarly journals Treatment and reuse of reactive dye effluent from textile industry using membrane technology

2015 ◽  
Author(s):  
◽  
Martha Noro Chollom
Keyword(s):  
Textile Industry ◽  
Reactive Dye ◽  
Effluent Treatment ◽  
Water Recovery ◽  
Textile Processing ◽  
Membrane Processes ◽  
Membrane Performance ◽  
Pre Treatment ◽  
The Cost

The textile industry consumes large volumes of water and in turn produces substantial quantities of polluted effluents. Approximately 30% of reactive dyes used during the textile processing remain unfixed on fibres and are responsible for the colouration in effluents. Various conventional methods are being used to treat textile effluent. However, the disadvantage of these methods is that total colour removal is not achieved and chemical by-products are introduced from the use of chemicals. The water quality produced therefore does not meet the requirement for textile reuse. Membrane based processes provide interesting possibilities of separating hydrolysed dye stuff and dyeing auxiliaries, thereby reducing colouration and COD content. They can be employed to treat reactive dye bath effluent to recover the salts and water for the purpose of reuse. This study aimed at integrating membrane processes into the reactive dye bath of a textile industry. The objectives were to determine the quality of permeate produced in terms of removal of organics, ascertain its reusability for dyeing, investigate the production rate in terms of permeate fluxes and finally to investigate the cleanability and flux recovery of the membranes. Three effluent samples were chosen for this study based on the dyeing recipe; Light shade, Medium shade and Dark shade. Ultrafiltration (UF) and Nanofiltration (NF) membrane processes were employed to treat the reactive dye bath effluents to recover the salts and water. Investigations were conducted firstly with UF as a pre-treatment to NF. Secondly, evaluations were carried out on the performance of two types of NF membranes (SR90 and NF90) in terms of permeate quality and fluxes for the investigated samples. The effect of cleaning on membrane performance was done. A reusability test was carried out on the permeate samples for dyeing. It was found that the use of UF as a pre-treatment yielded an increase in permeate of 5–25% of the NF fluxes and 90% in organics reduction for all treated samples, hence increasing the water recovery. High rejection of ˃90% by NF90 for COD, TOC and colour were obtained for all the treated samples. SR90 rejection was 80–90% for colour and ˃90% for COD and TOC. Salt recovery for NF90 was 60–90% and for SR90 was 40–50%. The reusability tests carried out showed that permeate recycled from NF90 can be used for any section in the textile industry including the most critical such as dyeing on light shades, while that from SR90 can be used for dyeing dark shades only. It was then concluded that membrane based processes can be integrated into the dye bath of the textile process for the purpose of reuse, thereby saving on the cost of chemicals (salts), reducing fresh water usage and reducing the extent of final effluent treatment.

Evaluation of FO membrane performance for each type of pre-treatment from WWTP secondary effluents

2016 ◽  
Vol 30 (2) ◽  
pp. 131-137
Author(s):  
Junwon Jeong ◽  
◽  
Jihoon Kim ◽  
Geonyoub Kim ◽  
Junyoung Park ◽  
...  
Keyword(s):  
Membrane Performance ◽  
Secondary Effluents ◽  
Pre Treatment

MBR technology: a promising approach for the (pre-)treatment of hospital wastewater

2012 ◽  
Vol 65 (9) ◽  
pp. 1648-1653 ◽  
Author(s):  
S. Beier ◽  
C. Cramer ◽  
C. Mauer ◽  
S. Köster ◽  
H. Fr. Schröder ◽  
...  
Keyword(s):  
Wastewater Treatment ◽  
Treatment Plant ◽  
Decisive Role ◽  
Health Care Facilities ◽  
Pollutant Removal ◽  
Operating Conditions ◽  
Hospital Wastewater ◽  
Pre Treatment ◽  
Polluted Wastewater ◽  
Trace Pollutants

Membrane bioreactor (MBR) technology is a very reliable and extensively tested solution for biological wastewater treatment. Nowadays, separate treatment of highly polluted wastewater streams especially from hospitals and other health care facilities is currently under investigation worldwide. In this context, the MBR technology will play a decisive role because an effluent widely cleaned up from solids and nutrients is absolutely mandatory for a subsequent further elimination of organic trace pollutants. Taking hospital wastewater as an example, the aim of this study was to investigate to what extent MBR technology is an adequate ‘pre-treatment’ solution for further elimination of trace pollutants. Therefore, we investigated – within a 2-year period – the performance of a full-scale hospital wastewater treatment plant (WWTP) equipped with a MBR by referring to conventional chemical and microbiological standard parameters. Furthermore, we measured the energy consumption and tested different operating conditions. According to our findings the MBR treatment of the hospital wastewater was highly efficient in terms of the removal of solids and nutrients. Finally, we did not observe any major adverse effects on the operation and performance of the MBR system which potentially could derive from the composition of the hospital wastewater. In total, the present study proved that MBR technology is a very efficient and reliable treatment approach for the treatment of highly polluted wastewater from hospitals and can be recommended as a suitable pre-treatment solution for further trace pollutant removal.

Screening optimisation for indirect potable reuse

2011 ◽  
Vol 63 (12) ◽  
pp. 2846-2852 ◽  
Author(s):  
J. W. Hatt ◽  
S. J. Judd ◽  
E. Germain
Keyword(s):  
Water Quality ◽  
Membrane Filtration ◽  
Mesh Size ◽  
Water Volume ◽  
Filtration Process ◽  
Biofilm Growth ◽  
Potable Reuse ◽  
Membrane Performance ◽  
Pre Treatment ◽  
Filter Fouling

An automatic backflush pre-filter used for pre-treatment for secondary wastewater re-use was evaluated and optimised at two different mesh sizes over an 18 month period. The filter was initially run with a 500 μm rating mesh size, as recommended by the supplier of the downstream membrane filtration process, and then at 100 μm to investigate any change in water quality produced and associated improved membrane performance. With the 500 μm mesh in place, the filter fouling rate was low and a backflush was initiated every 3.5 h. For the 100 μm mesh the fouling rate was extremely rapid. Fouling was found to be caused by reverse side blockage of the pre-filter due to biofilm growth, and not by improved solids capture; there was no improvement in water quality with the smaller mesh size, since particle unloading from the biofilm took place. The pre-filter fouling rate was found to be related to turbidity. At a turbidity of 5 NTU the filter backflushed around 200 times per day, while at 10 NTU this increased to over 300 times. Further analysis enabled the backflush water volume to be decreased by reducing the backflush duration and increasing the backflush cycle time (i.e. the time between backflushes).

scholarly journals Phycoremediation of Landfill Leachate with Desmodesmus subspicatus: A Pre-Treatment for Reverse Osmosis

Water ◽  
2020 ◽  
Vol 12 (6) ◽  
pp. 1755
Author(s):  
Marina Kholomyeva ◽  
Radek Vurm ◽  
Lucia Tajnaiová ◽  
Marek Šír ◽  
Mariya Maslova ◽  
...  
Keyword(s):  
Reverse Osmosis ◽  
Scenedesmus Obliquus ◽  
Ammonia Nitrogen ◽  
Pollutant Removal ◽  
Membrane Selectivity ◽  
Desmodesmus Subspicatus ◽  
Remediation Efficiency ◽  
Ecotoxicity Tests ◽  
Pre Treatment ◽  
The Impact

Reverse osmosis is widely used as one of the most effective and advanced technologies for the treatment of leachate from landfill sites. Unfortunately, high leachate contamination—above all, ammonia nitrogen—affects membrane selectivity and is reflected in permeate quality. Furthermore, iron contained in leachate can facilitate chelates forming, which reduces the membrane anti-fouling capacity. The addition of a pre-treatment step could alleviate the adverse impact of the pollutants. As such, we investigated pollutant removal by phycoremediation. Initial ecotoxicity tests of three algal strains (Scenedesmus obliquus (S. obliquus), Desmodesmus subspicatus (D. subspicatus), and Chlorella vulgaris (C. vulgaris)) identified D. subspicatus as the strain most tolerant to leachate toxicity. Subsequently, D. subspicatus was cultivated in six landfill leachates of different origin and, after the cultivation, removal rates were determined for ammonia nitrogen and iron. Furthermore, the impact of input leachate parameters on remediation efficiency was also investigated. By phycoremediation, the reduction of up to 100% in iron and 83% in ammonia nitrogen load was achieved, which demonstrates the high potential of microalgae to mitigate environmental risks and reduce membrane foulant content.

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