Ultrasonic cleaning of particle and natural organic matter fouled cross‐flow membranes

2008 ◽  
Vol 123 (5) ◽  
pp. 3046-3046
Author(s):  
Linda K. Weavers ◽  
Harold W. Walker ◽  
Dong Chen ◽  
Mikko O. Lamminen
Keyword(s):  
Organic Matter ◽  
Natural Organic Matter ◽  
Cross Flow ◽  
Ultrasonic Cleaning

Flocculation—cross-flow microfiltration hybrid system for natural organic matter (NOM) removal using hematite as a flocculent

Desalination ◽  
2002 ◽  
Vol 147 (1-3) ◽  
pp. 83-88 ◽  
Author(s):  
R. Thiruvenkatachari ◽  
H.H. Ngo ◽  
P. Hagare ◽  
S. Vigneswaran ◽  
R.Ben Aim
Keyword(s):  
Organic Matter ◽  
Natural Organic Matter ◽  
Hybrid System ◽  
Cross Flow

Ultrasonic cleaning of polytetrafluoroethylene membrane fouled by natural organic matter

2016 ◽  
Vol 497 ◽  
pp. 450-457 ◽  
Author(s):  
Chi-Chuan Kan ◽  
Divine Angela D. Genuino ◽  
Kim Katrina P. Rivera ◽  
Mark Daniel G. de Luna
Keyword(s):  
Organic Matter ◽  
Natural Organic Matter ◽  
Ultrasonic Cleaning

scholarly journals Electro-Conductive Composite Gold-Polyethersulfone-Ultrafiltration-Membrane: Characterization of Membrane and Natural Organic Matter (NOM) Filtration Performance at Different In-Situ Applied Surface Potentials

Membranes ◽  
2018 ◽  
Vol 8 (3) ◽  
pp. 64 ◽  
Author(s):  
Tomi Mantel ◽  
Paul Benne ◽  
Stanislav Parsin ◽  
Mathias Ernst
Keyword(s):  
Contact Angle ◽  
Organic Matter ◽  
Natural Organic Matter ◽  
Cross Flow ◽  
Surface Conductivity ◽  
Separation Performance ◽  
Microscopy Imaging ◽  
Charged Membrane ◽  
Modified Membrane

Next to the pore size distribution, surface charge is considered to be one main factor in the separation performance of ultrafiltration (UF) membranes. By applying an external surface potential onto an electro-conductive UF membrane, electrostatic induced rejection was investigated. This study introduces in a first part a relatively simple but yet not reported technology of membrane modification with direct current sputter deposition of ultrathin (15 nm) highly conductive gold layers. In a second part, characterization of the gold-coated UF flat sheet membrane with a molecular weight cut-off (MWCO) of 150 kDa is presented. Membrane parameters as contact angle (hydrophobicity), pure water permeability, MWCO, scanning electron microscopy imaging, zeta potential, surface conductivity and cyclic voltammetry of the virgin and the modified membrane are compared. Due to the coating, a high surface conductivity of 107 S m−1 was realized. Permeability of the modified membrane decreased by 40% but MWCO and contact angle remained almost unchanged. In a third part, cross-flow filtration experiments with negative charged Suwannee River Natural Organic Matter (SRNOM) are conducted at different cathodic and anodic applied potentials, different pH values (pH 4, 7, 10) and ionic strengths (0, 1, 10 mmol L−1). SRNOM rejection of not externally charged membrane was 28% in cross-flow and 5% in dead-end mode. Externally negative charged membrane (−1.5 V vs. Ag/AgCl) reached rejection of 64% which was close to the performance of commercial UF membrane with MWCO of 5 kDa. High ionic strengths or low pH of feed reduced the effect of electrostatic rejection.

Characterization of dissolved organic matter (DOM) extracted from soils by hot water percolation (HWP)

2010 ◽  
Vol 59 (1) ◽  
pp. 99-108 ◽  
Author(s):  
M. Takács ◽  
Gy. Füleky
Keyword(s):  
Organic Matter ◽  
Humic Acid ◽  
Natural Organic Matter ◽  
Extraction Methods ◽  
Soil Samples ◽  
Hot Water ◽  
Soil Extracts ◽  
Water Percolation ◽  
Soil Humic Acid

The Hot Water Percolation (HWP) technique for preparing soil extracts has several advantages: it is easily carried out, fast, and several parameters can be measured from the same solution. The object of this study was to examine the possible use of HWP extracts for the characterization of soil organic matter. The HPLC-SEC chromatograms, UV-VIS and fluorescence properties of the HWP extracts were studied and the results were compared with those of the International Humic Substances Society (IHSS) Soil Humic Acid (HA), IHSS Soil Fulvic Acid (FA) and IHSS Suwannee Natural Organic Matter (NOM) standards as well as their HA counterparts isolated by traditional extraction methods from the original soil samples. The DOM of the HWP solution is probably a mixture of organic materials, which have some characteristics similar to the Soil FA fractions and NOM. The HWP extracted organic material can be studied and characterized using simple techniques, like UV-VIS and fluorescence spectroscopy.

Characterization and isolation of natural organic matter from a eutrophic reservoir

2000 ◽  
Vol 49 (5) ◽  
pp. 269-280 ◽  
Author(s):  
Cheng-Nan Chang ◽  
Ying-Shih Ma ◽  
Guor-Cheng Fang ◽  
Fang-Fong Zing
Keyword(s):  
Organic Matter ◽  
Natural Organic Matter ◽  
Eutrophic Reservoir
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