Comparison of Methods for Assessing Reverse Osmosis Membrane Treatment of Shrimp Process Water

2005 ◽  
Vol 68 (4) ◽  
pp. 801-807 ◽  
Author(s):  
SANDRA CASANI ◽  
TINA B. HANSEN ◽  
JAKOB CHRISTENSEN ◽  
SUSANNE KNØCHEL
Keyword(s):  
Fluorescence Spectroscopy ◽  
Reverse Osmosis ◽  
Adenosine Triphosphate ◽  
Membrane Integrity ◽  
Process Water ◽  
Reverse Osmosis Membrane ◽  
Food Industries ◽  
Processing Line ◽  
Membrane Treatment ◽  
Higher Sensitivity

Interest in reuse of process water from the food industry has reinforced the importance of controlling and monitoring the effectiveness and reliability of treatment systems regarding removal of organic matter and microorganisms. The ability of adenosine triphosphate bioluminescence, conductivity, turbidometry, absorbance, and multichannel fluorescence spectroscopy for indirectly monitoring the integrity of a reverse osmosis membrane when treating process water recovered from peeling in a shrimp processing line was evaluated. This study demonstrated that reverse osmosis was capable of removing bacteria (ca. 7 log CFU ml−1) to the levels required by the regulatory authorities for water recycling within the same food unit operation. Adenosine triphosphate and turbidometry showed a higher sensitivity for detecting compromising conditions at the treatment system (0.1% concentration of feed in permeate) and a better correlation with the aerobic count at lower levels than the other methods investigated. The sensitivity for assessing membrane integrity of conductivity and multichannel fluorescence was 1% of feed in permeate. Impact of feed variations was best leveled out in the permeates for turbidity measurements. Multichannel fluorescence spectroscopy may require laborious calibration procedures and expertise regarding data analysis and interpretation of results, which are not always available in food industries. Absorbance did not respond to changes in membrane integrity and was not well correlated to the aerobic count because of the poor sensitivity of this method for these purposes.

Production of process water using integrated membrane processes

2006 ◽  
Vol 60 (6) ◽  
Author(s):  
K. Karakulski ◽  
M. Gryta ◽  
M. Sasim
Keyword(s):  
Reverse Osmosis ◽  
Membrane Fouling ◽  
Tap Water ◽  
Industrial Effluents ◽  
Membrane Distillation ◽  
Process Water ◽  
Feed Water ◽  
Reverse Osmosis Membrane ◽  
Permeate Flux ◽  
Membrane Processes

AbstractApplication of ultrafiltration, nanofiltration, reverse osmosis, membrane distillation, and integrated membrane processes for the preparation of process water from natural water or industrial effluents was investigated. A two-stage reverse osmosis plant enabled almost complete removal of solutes from the feed water. High-purity water was prepared using the membrane distillation. However, during this process a rapid membrane fouling and permeate flux decline was observed when the tap water was used as a feed. The precipitation of deposit in the modules was limited by the separation of sparingly soluble salts from the feed water in the nanofiltration. The combined reverse osmosis—membrane distillation process prevented the formation of salt deposits on the membranes employed for the membrane distillation. Ultrafiltration was found to be very effective removing trace amounts of oil from the feed water. Then the ultrafiltration permeate was used for feeding of the remaining membrane modules resulting in the total removal of oil residue contamination. The ultrafiltration allowed producing process water directly from the industrial effluents containing petroleum derivatives.

Occurrence of N-nitrosodimethylamine precursors in wastewater treatment plant effluent and their fate during ultrafiltration-reverse osmosis membrane treatment

2011 ◽  
Vol 63 (4) ◽  
pp. 605-612 ◽  
Author(s):  
M. J. Farré ◽  
J. Keller ◽  
N. Holling ◽  
Y. Poussade ◽  
W. Gernjak
Keyword(s):  
Wastewater Treatment ◽  
Reverse Osmosis ◽  
Wastewater Treatment Plants ◽  
Treatment Plant ◽  
Reverse Osmosis Membrane ◽  
Membrane Process ◽  
Recycled Water ◽  
Straightforward Method ◽  
Wastewater Recycling ◽  
Membrane Treatment

The formation of N-nitrosodimethylamine (NDMA) is of major concern among wastewater recycling utilities practicing disinfection with chloramines. The NDMA formation potential (FP) test is a simple and straightforward method to evaluate NDMA precursor concentrations in waters. In this paper we show the NDMA FP results of a range of tertiary wastewater treatment plants that are also the source for production of recycled water using an Ultrafiltration – Reverse Osmosis (UF-RO) membrane process. The results indicate that the NDMA FP of different source waters range from 350 to 1020±20 ng/L. The fate of these NDMA precursors was also studied across the different stages of two Advanced Water Treatment Plants (AWTP) producing recycled water. These results show that more than 98.5±0.5% of NDMA precursors are effectively removed by the Reverse Osmosis (RO) membranes used at the AWTPs. This drastically reduces any potential for re-formation of NDMA after the RO stage even if chloramines may be present (or added) there.

scholarly journals A Review Of Reverse Osmosis Membrane Fouling: Formation and Control

2021 ◽  
Vol 1 (3) ◽  
pp. 110-115
Author(s):  
Rizka Mulyawan ◽  
Agam Muarif
Keyword(s):  
Reverse Osmosis ◽  
Membrane Fouling ◽  
Energy Demand ◽  
Granular Media ◽  
Reverse Osmosis Membrane ◽  
Additional Energy ◽  
Ro Membrane ◽  
Pre Treatment ◽  
Exchange Resins ◽  
Membrane Treatment

Membrane application in reverse osmosis (RO) membrane is getting more attention especially in producing drinking water. However, RO membrane faces challenges that reduces its performance such as its permeation flux, salt rejection, additional energy demand, lifetime decrease, extra pre-treatment process, cleaning and maintenance. The challenge is the formation of fouling. RO membrane fouling can happen inside or outside the membrane and the characteristics of membrane fouling differs from one type to other types, depending on the nature and location of membrane fouling. There are several types of RO fouling, which are Biofouling, Organic Fouling, Inorganic Fouling and Colloidal Fouling. The causes of RO membrane are different from one to another. The properties and materials of the  solution entering RO membrane are important as it affects the type of fouling of RO membrane fouling. All of the RO membrane foulings need to be considered during membrane usage and demand solution to be controlled. In order to control the fouling in Reverse Osmosis membrane, there have been several control solutions discovered to the membrane fouling challenges. The control solutions are specified to each one of the fouling, in spite of wide applications for some of it. The control solutions are pre-treatment, which has many methods such as photo oxidation, coagulation, scale inhibitor, ion exchange resins, granular media and membrane    treatment, membrane monitoring, membrane cleaning, surface modification, and material addition to membrane or novel membrane   material. With various control solutions discovered, the RO membrane still faces fouling issue and is still demanding some more    advanced applicable control solutions.

Reverse Osmosis Membrane Treatment Improves Salt-Rejection Performance

2010 ◽  
Vol 2 (2) ◽  
pp. 22-34
Author(s):  
S.T. Mitrouli ◽  
A.J. Karabelas ◽  
N.P. Isaias ◽  
D.C. Sioutopoulos ◽  
A.S. Al Rammah
Keyword(s):  
Reverse Osmosis ◽  
Reverse Osmosis Membrane ◽  
Salt Rejection ◽  
Membrane Treatment
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