A pilot-scale comparison between granular media fi ltration and low-pressure membrane fi ltration for seawater pretreatment

2009 ◽  
Vol 9 (1-3) ◽  
pp. 22-27 ◽  
Author(s):  
P.-J. Remize ◽  
J.-F. Laroche ◽  
J. Leparc ◽  
J.-C. Schrotter
Keyword(s):  
Granular Media ◽  
Low Pressure ◽  
Pilot Scale ◽  
Fi Ltration

A pilot-scale comparison of granular media filtration and low-pressure membrane filtration for seawater pretreatment

2009 ◽  
Vol 5 (1-3) ◽  
pp. 6-11 ◽  
Author(s):  
P.-J. Remize ◽  
J.-F. Laroche ◽  
J. Leparc ◽  
J.-C. Schrotter
Keyword(s):  
Membrane Filtration ◽  
Granular Media ◽  
Low Pressure ◽  
Pilot Scale

Use of Low Pressure Mercury Lamps for the Photodecomposition of Iron Cyanide in Gold Mill Effluents

1985 ◽  
Vol 20 (2) ◽  
pp. 111-119 ◽  
Author(s):  
J.H. Carey ◽  
S.A. Zaidi
Keyword(s):  
Ultraviolet Light ◽  
High Intensity ◽  
Experimental Evaluation ◽  
Low Pressure ◽  
Pilot Scale ◽  
Weak Acid ◽  
Potassium Ferricyanide ◽  
Technical Feasibility ◽  
Iron Cyanide ◽  
Scale Test

Abstract The use of ultraviolet light (UV) from low pressure mercury lamps for destroying iron cyanide in synthetic and actual gold mill effluents was evaluated in this study. For the light intensities used in this study, UV irradiation was not able to efficiently destroy cyanide. However, it converted iron cyanide to a weak acid dissociable form which was destroyed by chlorine. Data from several bench-scale tests and one pilot scale test were used to estimate quantum efficiencies (moles iron cyanide destroyed/einstein). These efficiencies ranged from 0.2% to 1%; approximately 30% to 90% lower than those reported in the literature for potassium ferricyanide. The data collected during the study demonstrated the technical feasibility of using UV in conjunction with chlorination for destroying iron cyanide in gold mill effluents. However, low pressure mercury lamps do not appear to be a practical UV source for this purpose. Irradiation with high intensity lamps may be more practical and is recommended for experimental evaluation.

Evaluation of the low pressure RO and NF membranes for an alternative tyreatment of Buyukcekmece Lake

2001 ◽  
Vol 1 (1) ◽  
pp. 107-115 ◽  
Author(s):  
I. Koyuncu ◽  
M. Yazgan ◽  
D. Topacik ◽  
H.Z. Sarikaya
Keyword(s):  
Recovery Rate ◽  
Pressure Range ◽  
Membrane Separation ◽  
Low Pressure ◽  
Pilot Scale ◽  
Transmembrane Pressure ◽  
Water Reclamation ◽  
Membrane Type ◽  
New Generation ◽  
Better Than

The recent development of new generation LPRO and LPNF membranes has received attention for application in the field of wastewater and water treatment through an increasingly stringent regulation for drinking water purposes and water reclamation. This paper presents the pilot scale membrane separation studies on Buyukcekmece Lake in Istanbul with low pressure reverse osmosis (LPRO) and low pressure nanofiltration (LPNF) membranes. The application to treatment of anionic and cationic pollutants (Na+, Mg2+, Ca2+, Cl–, SO42–, NO3–) has been investigated as a function of transmembrane pressure and recovery rate under very low pressure range (3, 4, 5, and 6 bars). Flux value increased with increasing pressure and the membrane type of TFC-S gave the highest fluxes. The rejections of ions were increased with transmembrane pressure for two types of membranes. TFC-HR membrane rejection performance was better than the TFC-S membrane for all anionic and cationic pollutants. As recovery rate rises, the rejections were decreased.

Evaluation of biologic and non-biologic methods for assessing virus removal by and integrity of high pressure membrane systems

2003 ◽  
Vol 3 (5-6) ◽  
pp. 81-92 ◽  
Author(s):  
M. Kitis ◽  
J.C. Lozier ◽  
J.H. Kim ◽  
B. Mi ◽  
B.J. Mariñas
Keyword(s):  
River Water ◽  
Granular Media ◽  
Pilot Scale ◽  
Test Methods ◽  
Single Element ◽  
Secondary Effluent ◽  
Membrane Systems ◽  
Integrity Test ◽  
Virus Removal ◽  
Membrane Processing

This paper describes pilot-scale studies that examined three integrity test methods for: (1) quantifying virus removal by nanofiltration (NF) and reverse osmosis (RO) membrane systems when arranged in single element unit and two-stage system configurations, and (2) determining change in virus removal capability of such systems when subject to different types of membrane/o-ring compromisation and fouling. The three methods evaluated included one biologic type (MS-2 phage), that has been employed previously; and two, new non-biologic types (24-nanometre polystyrene fluorescent dyed microspheres and fluorescent Rhodamine WT [R-WT] dye, molecular mass 496 daltons). All three surrogates were employed in a manner intended to show a minimum of 4-logs removal by the NF and RO membranes selected for test. Methods of compromisation included a pinhole induced through one membrane leaf in the spiral wound NF/RO element, and both cracking of and removal of sections from one of the permeate tube o-rings. Testing was conducted on two source waters, representing brackish surface water and effluent categories: a microfiltered secondary effluent and a river water. The river water is characterized by low to moderate TDS and high TOC and was treated with conventional alum coagulation, flocculation, sedimentation and granular media filtration for subsequent membrane processing.

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