membrane feed water Articles
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Analyses of calcium carbonate scale deposition on four RO membranes under a seawater desalination condition
Inorganic fouling is one of the critical operational issues in reverse osmosis membrane. Few researches investigated effects of membrane surface characteristics on inorganic fouling and on anti-scaling techniques although the fouling occurs on the membrane surface. The objective of this paper was to examine whether different characteristics of deposition of calcium carbonate solids would occur on ...
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The effect of intermittent operation on a wind-powered membrane system for brackish water desalination
Renewable energy powered membrane systems that are directly-connected must take account of both the inherent fluctuations and the intermittency of the energy resource. In order to determine the effect of intermittent operation, a membrane system was tested with variables of (i) amplitude from 60 to 300 W and (ii) length of time with no power from 0.5 to 3 min. This was performed over one hour ...
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Boiler feed water degasification using membrane contactors - new methods for optimizing performance
Abstract Membrane Contactors have been used to remove dissolved oxygen in boiler feed water systems for years. This report reviews various system designs and discusses how Membrane Contactors can be optimized in boiler feed water applications for removal of dissolved oxygen as well as carbon dioxide. The report also highlights what advantages membrane systems have over conventional oxygen and ...
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Degasification of boiler feed water with Liqui-Cel® membrane contactors
Proper treatment of boiler feed water is an important part of operating and maintaining a boiler system. As steam is produced, dissolved solids become concentrated and form deposits inside the boiler. This leads to poor heat transfer and reduces the efficiency of the boiler. Dissolved gasses such as oxygen and carbon dioxide will react with the metals in the boiler system and lead to boiler ...
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Rapid novel test for the determination of biofouling potential on reverse osmosis membranes
A novel method was proposed to determine biofouling potential by direct analysis of a reverse osmosis (RO) membrane through fluorescence intensity analysis of biofilm formed on the membrane surface, thereby incorporating fouling tendencies of both feedwater and membrane. Evaluation of the biofouling potential on the RO membrane was done by accelerated biofilm formation through soaking of ...
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Hybrid TiO2 photocatalytic oxidation and ultrafiltration for humic acid removal and membrane fouling control
Hybrid UV/TiO2 photocatalytic oxidation (PCO) and ultrafiltration (UF) process (PCO-UF) were used to remove humic acid (HA) and control membrane fouling. The PCO-UF process showed advantages in terms of higher removal rate of HA, higher permeate flux and less membrane fouling over UF alone and PCO alone on HA removal and membrane fouling control. Membrane material and pH of feed water were shown ...
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Industrial reverse osmosis system design
Reverse osmosis (RO) is currently used in various applications ranging from small, undersink drinking water units to large industrial systems. The technology is widely used and accepted as it removes both dissolved ionic and organic impurities. This article will focus on the reverse osmosis technology in industrial applications and will discuss factors that differentiate industrial RO from ...
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Distillation Process Can Yield Zero Liquid Discharge System
Many industrial applications produce liquid waste as a by-product of their process. As environmental regulations governing the disposal of industrial wastewater become more stringent, it's imperative that innovative wastewater treatment solutions are used to treat this waste and minimize the environmental impact of disposal. While numerous technologies exist to treat industrial wastewater, Zero ...
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Värtan Kvv8 Project - Case Study
Fortum Värme new plant - KVV8 at Värtaverket in Stockholm, with its 345MW is to our knowledge the largest biomass-fired boiler equipped with flue gas condensation. In favourable operating conditions a whopping 100 MW heat can be recovered by condensation. Radscan delivery is composed of condensation with combustion air moistening and pre-heating. Condensate purification up to boiler ...
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Confirmation of the correlation between membrane fouling in microfiltration and biopolymer concentrations in various Japanese surface waters
A variety of surface waters used for drinking water sources were collected from different parts of Japan to investigate a correlation between the concentration of hydrophilic biopolymer (e.g. proteins and polysaccharides) in the feed water and membrane fouling in microfiltration. Hollow-fiber membranes made from polyvinylidene fluoride with a nominal pore size of 0.1 μm were used in the ...
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High performance RO membranes for desalination and wastewater reclamation and their operation results
Reverse osmosis (RO) membrane is one of the most powerful tools for solving the global water crisis, and is used in a variety of water treatment scenes such as drinking water purification, waste-water treatment, boiler feed water production, ultra pure water production for semiconductor industry, etc. The desired performance of RO membrane varies according to quality of feed water being treated, ...
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Ceramic membranes for water treatment
Ceramic membranes, different in pore size and membrane material, were applied to remove particulate and dissolved matter from different spent filter backwash water types as well as from dam water. The study was conducted in pilot scale under conditions typical for waterworks at a dam water treatment plant. A comparison of different ceramic membranes implied that total membrane resistance was more ...
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High performance RO membranes for desalination and wastewater reclamation and their operation results
Reverse osmosis (RO) membrane is one of the most powerful tools for solving the global water crisis, and is used in a variety of water treatment scenes such as drinking water purification, waste-water treatment, boiler feed water production, ultra pure water production for semiconductor industry, etc. The desired performance of RO membrane varies according to quality of feed water being treated, ...
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Depth exposed membrane for water extraction (DEMWAX) for seawater desalination
Introduction The Depth Exposed Membrane for Water Extraction (DEMWAX) is a novel approach to both fresh surface water treatment and seawater desalination that deploys a system directly within the source water body. The DEMWAXTM system is configured to take advantage of the natural (free) pressure of the source water body to drive a membrane process. This configuration has many advantages over the ...
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Ion transport characteristics in nanofiltration membranes: measurements and mechanisms
Ion transport characteristics during nanofiltration (NF) were investigated by measuring effective osmotic pressure and diffusivity experimentally. Effective osmotic pressure and diffusivity were measured through lab-scale transport and diffusion tests. First, it was shown that the water flux across NF membranes decreased dramatically with increasing ionic strength because of the noticeable ...
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One of the largest ipp power plants in the middle east uses membrane desalination for boiler feed water
The Facility Sidi Krir Unit 3 & 4 Power Plant, developed by InterGen and Edison SpA, is located about 30 kilometers west of Alexandria, Egypt. It is a natural gas fired power plant and at 685 MW generating capacity, is the largest IPP thermal power plant in the Middle East. The plant consists of two power blocks, which share a common membrane based Seawater Desalination system for their ...
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UF Allows Use of RO for Power Plant’s Water Demineralization - Case Study
PROJECT DETAILS LOCATION Buenos Aires, Argentina CUSTOMER Central Puerto Power Plant SOLUTION Complete Water Demineralization Plant TECHNOLOGIES Ultrafiltration, Reverse Osmosis, Continuous Electrodeionization A power plant in Buenos Aires needed to increase its demineralized water production and save money on operating expenses, but the poor quality of the available raw water from a ...
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A study of the physical and chemical damage on reverse osmosis membranes detected by autopsies
Abstract Water treatment by reverse osmosis technology has as main aim to reject the maximum percentage of ions from raw water, giving as much treated water flow as possible. When there is a loss in these two parameters performance, it is essential to find the source of the failure, in order to use the necessary tools for its recovery. At this point, membrane autopsies are a very valuable source ...
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TB 45: Boiler feed water degassing lowers operations costs and chemical usage
ShenLan Environment Inc. located in Shanghai China uses Liqui-Cel® Membrane Contactors in their boilerfeed water treatment systems. These systems realize lower operating costs with the added benefit of reducing the chemicals added to the boiler feed water. BackgroundProper treatment of boiler feed water is an important component of a boiler system. As steam is produced, dissolved solids become ...
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Theoretical and practical experience of calcium phosphate inhibition in RO waters
The increasing trend over the last ten years to use waste water as a feed source for reverse osmosis membrane plant has resulted in an increase in calcium phosphate scaling on membrane surfaces. This is due to much higher levels of phosphate in waste water typically 10-30 mg/l as compared with a groundwater source which may have only 1-5 mg/l of phosphate. These higher phosphate levels resulting ...
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