Scale inhibitor and recovery optimization for a brackish water supply: pilot test results and full-scale experiences

2003 ◽  
Vol 3 (5-6) ◽  
pp. 139-145 ◽  
Author(s):  
S. Duranceau ◽  
W.A. Lovins ◽  
J.V. Foster ◽  
D. Taylor ◽  
J. Morton ◽  
...  
Keyword(s):  
Sulfuric Acid ◽  
Reverse Osmosis ◽  
Brackish Water ◽  
Calcium Sulfate ◽  
Treatment Plant ◽  
Full Scale ◽  
Feed Water ◽  
Test Results ◽  
Scale Inhibitor ◽  
Acid Addition

Pilot testing was conducted at a brackish water reverse osmosis water treatment plant to identify operational constraints associated with effective scaling control. The test program involved testing select inhibitors/dispersants, feed water pH, and operating recovery as part of a full-scale retrofit from a hollow fiber to spiral-wound reverse osmosis membrane facility. The test results indicated the facility could be operated at elevated recovery, but was sensitive to conditioning with sulfuric acid. Use of sulfuric acid addition to control calcium carbonate scaling was determined to increase calcium sulfate scaling. Membrane autopsy data confirmed calcium sulfate scaling onto the membrane surface with minimal biological and organic content. It was determined that recovery could be increased from 65 to 75 percent by discontinuing sulfuric acid addition and feeding only scale inhibitor. Scale inhibitors with dispersant properties were recommended for full-scale implementation.

scholarly journals Biofilm Formation on Reverse Osmosis Membranes Is Initiated and Dominated by Sphingomonas spp.

2010 ◽  
Vol 76 (8) ◽  
pp. 2623-2632 ◽  
Author(s):  
L. A. Bereschenko ◽  
A. J. M. Stams ◽  
G. J. W. Euverink ◽  
M. C. M. van Loosdrecht
Keyword(s):  
Reverse Osmosis ◽  
Treatment Plant ◽  
Full Scale ◽  
Laser Scanning Microscopy ◽  
Confocal Laser ◽  
Feed Water ◽  
Initial Formation ◽  
Flow Cells ◽  
Ro Membrane

ABSTRACT The initial formation and spatiotemporal development of microbial biofilm layers on surfaces of new and clean reverse osmosis (RO) membranes and feed-side spacers were monitored in situ using flow cells placed in parallel with the RO system of a full-scale water treatment plant. The feed water of the RO system had been treated by the sequential application of coagulation, flocculation, sand filtration, ultrafiltration, and cartridge filtration processes. The design of the flow cells permitted the production of permeate under cross-flow conditions similar to those in spiral-wound RO membrane elements of the full-scale system. Membrane autopsies were done after 4, 8, 16, and 32 days of flow-cell operation. A combination of molecular (fluorescence in situ hybridization [FISH], denaturing gradient gel electrophoresis [DGGE], and cloning) and microscopic (field emission scanning electron, epifluorescence, and confocal laser scanning microscopy) techniques was applied to analyze the abundance, composition, architecture, and three-dimensional structure of biofilm communities. The results of the study point out the unique role of Sphingomonas spp. in the initial formation and subsequent maturation of biofilms on the RO membrane and feed-side spacer surfaces.

scholarly journals Benchmarking of scaling and fouling of reverse osmosis membranes in a power generation plant of paper and board mill: an industrial case of a paper and board mill study

2020 ◽  
Author(s):  
S. Z. J. Zaidi ◽  
A. Shafeeq ◽  
M. Sajjad ◽  
S. Hassan ◽  
M. S. Aslam ◽  
...  
Keyword(s):  
Reverse Osmosis ◽  
Acid Treatment ◽  
Power Plants ◽  
Saturation Index ◽  
Thermal Power ◽  
Treatment Plant ◽  
Feed Water ◽  
Operational Parameters ◽  
Water Stream ◽  
Reject Water

AbstractThe present study reports the characterization of reverse osmosis (RO) technology at water treatment plant Cogen-2 in paper and Board mills, Pakistan. RO is a commonly used process to obtain de-mineralized water for high-pressure boiler operation in thermal power plants. Scaling and fouling in three-stage RO plants is a major challenge in chemical industry due to the use of raw brackish water in the power plant of paper and board mills. In our study, the feed water quality of RO was changed from soft water to raw water to make it economical. The cleaning frequency was increased three times than normal, which was unsafe for operation and it was required to control scaling and fouling to achieve the desired result. Differential pressures behavior of all stages for 2-month data was observed without acid treatment, and the results of Langelier Saturation Index (LSI) control parameters (temperature, pH, total dissolved solids, calcium hardness, and alkalinity) clearly showed the abnormality. To optimize scaling and fouling of RO, the LSI factor was controlled in total reject water for the next 2 months by acid treatment in feed water. Duration of chemical cleaning and membranes’ life has been extended by fouling and scaling control. Understanding the effect of operational parameters in RO membranes is essential in water process engineering due to its broad applications in drinking water, sanitation, seawater, desalination process, wastewater treatment, and boiler feed water operation. The product flow increased from 18.3 to 19.9 m3/h, and this was due to a decrease in the rejection flow from 8.2 to 6.7 m3/h. The total reject stream pressure also increased from 8.1 to 9 bar. A lower value of LSI of 1.6 is obtained in the reject water stream after the acid treatment.

Test results on FT-30 eight-inch-diameter seawater and brackish water reverse osmosis elements

Desalination ◽  
1983 ◽  
Vol 46 (1-3) ◽  
pp. 81-90 ◽  
Author(s):  
R.E Larson ◽  
R.J Petersen ◽  
P.K Eriksson
Keyword(s):  
Reverse Osmosis ◽  
Brackish Water ◽  
Test Results

Modeling and evaluating performance of full-scale reverse osmosis system in industrial water treatment plant

Desalination ◽  
2021 ◽  
Vol 518 ◽  
pp. 115289
Author(s):  
Kwanho Jeong ◽  
Moon Son ◽  
Nakyung Yoon ◽  
Sanghun Park ◽  
Jaegyu Shim ◽  
...  
Keyword(s):  
Water Treatment ◽  
Reverse Osmosis ◽  
Treatment Plant ◽  
Water Treatment Plant ◽  
Full Scale ◽  
Industrial Water

Operational experience of the brackish water reverse osmosis of the water treatment plant in Sant Joan Despí

2012 ◽  
Vol 51 (1-3) ◽  
pp. 140-149 ◽  
Author(s):  
Albert Teuler ◽  
Àlex Vega ◽  
Josep Coma ◽  
Daniela Vidal ◽  
Jordi Aumatell
Keyword(s):  
Water Treatment ◽  
Reverse Osmosis ◽  
Brackish Water ◽  
Treatment Plant ◽  
Water Treatment Plant ◽  
Operational Experience

Full-Scale Experience with Sludge Treatment at the Vienna Sewage Works

1989 ◽  
Vol 21 (10-11) ◽  
pp. 1447-1451 ◽  
Author(s):  
Peter Thomas Ruggenthaler
Keyword(s):  
Sewage Treatment ◽  
Sewage Treatment Plant ◽  
Treatment Plant ◽  
Full Scale ◽  
Fluidised Bed ◽  
Test Results ◽  
Sludge Treatment ◽  
Treatment And Disposal ◽  
Solids Content

The sewage treatment plant at Simmering, Vienna, has been operating since June 1980, together with the ‘EbS' plant for sludge treatment and disposal. This latter consisted of centrifuges, grinder dryers and fluidised bed incineration but due to difficulties with the grinder dryers it has never operated efficiently. Accordingly trials have been done using improved centrifuges and filter presses to increase the dry solids content of the cake fed to the incinerators without using the grinder dryers. It was found that all systems tried were an improvement on the existing but that the best result was achieved using a Centripress on preheated sludge conditioned by polyelectrolyte. The plant was converted to this system in 1987 and results of full-scale operation as well as test results are given in the paper.

scholarly journals Pilot-Scale Assessment of Urea as a Chemical Cleaning Agent for Biofouling Control in Spiral-Wound Reverse Osmosis Membrane Elements

Membranes ◽  
2019 ◽  
Vol 9 (9) ◽  
pp. 117 ◽  
Author(s):  
Huma Sanawar ◽  
Szilárd S. Bucs ◽  
Martin A. Pot ◽  
Jure Zlopasa ◽  
Nadia M. Farhat ◽  
...  
Keyword(s):  
Reverse Osmosis ◽  
Treatment Plant ◽  
Pilot Scale ◽  
Full Scale ◽  
Membrane Module ◽  
Urea Solution ◽  
Chemical Cleaning ◽  
Cleaning Agent ◽  
Biofouling Control ◽  
Spiral Wound

Routine chemical cleaning with the combined use of sodium hydroxide (NaOH) and hydrochloric acid (HCl) is carried out as a means of biofouling control in reverse osmosis (RO) membranes. The novelty of the research presented herein is in the application of urea, instead of NaOH, as a chemical cleaning agent to full-scale spiral-wound RO membrane elements. A comparative study was carried out at a pilot-scale facility at the Evides Industriewater DECO water treatment plant in the Netherlands. Three fouled 8-inch diameter membrane modules were harvested from the lead position of one of the full-scale RO units treating membrane bioreactor (MBR) permeate. One membrane module was not cleaned and was assessed as the control. The second membrane module was cleaned by the standard alkali/acid cleaning protocol. The third membrane module was cleaned with concentrated urea solution followed by acid rinse. The results showed that urea cleaning is as effective as the conventional chemical cleaning with regards to restoring the normalized feed channel pressure drop, and more effective in terms of (i) improving membrane permeability, and (ii) solubilizing organic foulants and the subsequent removal of the surface fouling layer. Higher biomass removal by urea cleaning was also indicated by the fact that the total organic carbon (TOC) content in the HCl rinse solution post-urea-cleaning was an order of magnitude greater than in the HCl rinse after standard cleaning. Further optimization of urea-based membrane cleaning protocols and urea recovery and/or waste treatment methods is proposed for full-scale applications.

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