Restoring Submerged UF Membrane Performance Using an Innovative Patent-Pending Chemical Cleaning Procedure

2018 ◽  
Vol 2018 (18) ◽  
pp. 197-209
Author(s):  
Gayathri Ram Mohan ◽  
Robert Harris ◽  
JC Lan ◽  
Srinivas Jalla ◽  
Jim Lozier
Keyword(s):  
Chemical Cleaning ◽  
Cleaning Procedure ◽  
Membrane Performance

Optimized chemical cleaning procedure for enhancing photoemission from GaAs photocathode

2019 ◽  
Vol 91 ◽  
pp. 41-46 ◽  
Author(s):  
Cheng Feng ◽  
Yijun Zhang ◽  
Jian Liu ◽  
Yunsheng Qian ◽  
Jingzhi Zhang ◽  
...  
Keyword(s):  
Chemical Cleaning ◽  
Cleaning Procedure

scholarly journals The chemical cleaning of ceramic membrane used in UF

2012 ◽  
Vol 14 (3) ◽  
pp. 105-109 ◽  
Author(s):  
Maria Tomaszewska ◽  
Lidia Białończyk
Keyword(s):  
Food Industry ◽  
Ceramic Membrane ◽  
Fermentation Broth ◽  
Membrane Surface ◽  
Membrane Properties ◽  
Chemical Cleaning ◽  
Cleaning Procedure ◽  
Essential Step ◽  
Uf Membranes ◽  
Optimum Recovery

Ultrafiltration (UF) is one of the membrane processes which is mostly used in the dairy industry for the separation and concentration of whey components or fermentation broth. Fouling of UF membranes in the food industry is primarily due to a deposition of microorganisms, proteins, fats and minerals on the membrane surface. Thus, cleaning of the membranes is an essential step of UF separation. The results from investigations of chemical cleaning of a ceramic UF membrane fouled by precipitation of whey components and yeast contained in the fermentation broth are presented. The effect of cleaning procedure on the degree of permeability restoration by the fouled membrane was studied. The results demonstrated that a combination of sodium hydroxide, phosphoric acid and sodium hypochlorite as a disinfectant could be successfully used to achieve an optimum recovery of the membrane properties.

Membrane-based pretreatment to mitigate variations in desalination plants

2018 ◽  
Vol 77 (12) ◽  
pp. 2858-2866 ◽  
Author(s):  
J. Arevalo ◽  
R. Sandin ◽  
M. D. Kennedy ◽  
S. G. Salinas Rodriguez ◽  
F. Rogalla ◽  
...  
Keyword(s):  
Pilot Plant ◽  
Colloidal Particles ◽  
High Water ◽  
Stable Operation ◽  
High Concentration ◽  
Chemical Cleaning ◽  
Membrane Performance ◽  
Water Pretreatment ◽  
Cleaning Procedures ◽  
Desalination Plants

Abstract The main source of potable water in high water-stress areas is commonly produced in brackish and seawater desalination plants. Owing to the presence of high concentration of suspended solids, organic matter and colloidal particles in raw water, pretreatment processes are needed for a stable operation of desalination plants. A submerged membrane ultrafiltration pilot plant has been operated as pretreatment of complex brackish surface water to study the filtration performance. The results show the membrane performance, chemical reagent requirements, water quality and cleaning procedures efficiency of an ultrafiltration pilot plant used as pretreatment for a reverse osmosis system. Alternative chemical cleaning procedures have been satisfactorily implemented, which maximize permeability recovery and allow a stable operation.

Effects of consecutive chemical cleaning on membrane performance and surface properties of microfiltration

Desalination ◽  
2012 ◽  
Vol 286 ◽  
pp. 324-331 ◽  
Author(s):  
Ji Hyang Kweon ◽  
Jae Hyun Jung ◽  
Seung Ryul Lee ◽  
Hyung Woo Hur ◽  
Yongcheol Shin ◽  
...  
Keyword(s):  
Surface Properties ◽  
Chemical Cleaning ◽  
Membrane Performance

scholarly journals Initial Conditioning of Used Cigarette Filters for Their Recycling as Acoustical Absorber Materials

Materials ◽  
2021 ◽  
Vol 14 (15) ◽  
pp. 4161
Author(s):  
Valentín Gómez Escobar ◽  
Celia Moreno González ◽  
María José Arévalo Caballero ◽  
Ana Mᵃ Gata Jaramillo
Keyword(s):  
Moisture Content ◽  
Building Construction ◽  
Chemical Cleaning ◽  
Cleaning Procedure ◽  
Cigarette Butts

Used cigarette butts represent a major and problematic form of waste, due to their abundance, toxicity, and durability. Moreover, the few proposals for their recycling are clearly insufficient, and new ones are welcome. For a new proposal regarding the reuse of used cigarette butts as acoustical absorbers in building construction, previous conditioning of the used butts is performed. This conditioning includes the elimination of moisture and toxic products accumulated in the filter of the cigarettes. Thus, in this work, the moisture content effect in acoustical absorption was analyzed, and a proposal for elimination is made. Moreover, a chemical cleaning procedure is proposed, and its influence on the acoustical behavior of the samples was also analyzed.

scholarly journals Application of Zwitterions in Forward Osmosis: A Short Review

Polymers ◽  
2021 ◽  
Vol 13 (4) ◽  
pp. 583
Author(s):  
Yu-Hsuan Chiao ◽  
Arijit Sengupta ◽  
Micah Belle Marie Yap Ang ◽  
Shu-Ting Chen ◽  
Teow Yeit Haan ◽  
...  
Keyword(s):  
Membrane Fouling ◽  
Municipal Wastewater ◽  
Separation Efficiency ◽  
Interfacial Polymerization ◽  
Membrane Surface ◽  
Forward Osmosis ◽  
Short Review ◽  
Chemical Cleaning ◽  
Membrane Performance

Forward osmosis (FO) is an important desalination method to produce potable water. It was also used to treat different wastewater streams, including industrial as well as municipal wastewater. Though FO is environmentally benign, energy intensive, and highly efficient; it still suffers from four types of fouling namely: organic fouling, inorganic scaling, biofouling and colloidal fouling or a combination of these types of fouling. Membrane fouling may require simple shear force and physical cleaning for sufficient recovery of membrane performance. Severe fouling may need chemical cleaning, especially when a slimy biofilm or severe microbial colony is formed. Modification of FO membrane through introducing zwitterionic moieties on the membrane surface has been proven to enhance antifouling property. In addition, it could also significantly improve the separation efficiency and longevity of the membrane. Zwitterion moieties can also incorporate in draw solution as electrolytes in FO process. It could be in a form of a monomer or a polymer. Hence, this review comprehensively discussed several methods of inclusion of zwitterionic moieties in FO membrane. These methods include atom transfer radical polymerization (ATRP); second interfacial polymerization (SIP); coating and in situ formation. Furthermore, an attempt was made to understand the mechanism of improvement in FO performance by zwitterionic moieties. Finally, the future prospective of the application of zwitterions in FO has been discussed.

Microfiltration of cheese brine

1983 ◽  
Vol 50 (4) ◽  
pp. 503-509 ◽  
Author(s):  
Uzi Merin ◽  
Salli Gordin ◽  
Gerald B. Tanny
Keyword(s):  
Pore Size ◽  
Cleaning Procedure ◽  
Membrane Performance ◽  
Flux Decline ◽  
Soft Cheese ◽  
Number Of Microorganisms ◽  
Complete Rejection ◽  
A New Technique ◽  
Flow Filtration ◽  
Hard Cheese

SUMMARYA new technique is described for the microfiltration of cheese brine. Soft cheese brine with viable counts/ml of up to 1·2 × 106bacteria and 2·2 × 104yeasts and moulds was filtered using a pleated tangential flow filtration cartridge of 0·2 εm pore size membrane. This filtration resulted in a 3–4 orders of magnitude reduction of bacteria and the complete rejection of yeast and mould from the permeate. Hard cheese brine with similar bacterial loads was treated with a 1·2 εm pore size membrane cartridge and the resulting permeate contained 2–3 orders of magnitude fewer bacteria and no yeasts or moulds. Flux decline during the filtration was a function of the number of microorganisms and the amount of N in the brine. A cleaning procedure using enzyme and acid washes was established in order to prolong membrane performance.

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