The Best RO Plant Prices In Pakistan Are Offered By Water Logic

Six Reverse Osmosis Design Factors for Industrial Reverse Osmosis Systems

In power generation and other industrial installations that use large amounts of steam, it is important that the installation produce steam without interruption. Therefore, it is also extremely important to ensure an ultra-pure source of boiler feedwater. For this reason, we are increasingly designing, installing and operating industrial RO Plant Prices In Pakistan.

Over the past 15 to 20 years, the use of RO Plant Price in Pakistan has become increasingly common in industrial and power generation facilities, particularly in new cogeneration and independent power generation facilities. Retrofitting reverse osmosis membranes into boiler water pretreatment systems in older industrial installations is also becoming more common. This is particularly true for conventional utility generation facilities with base loads, regardless of fuel source.

This article outlines six types of RO equipment and operating parameters to consider before purchasing a RO system for a power plant or industrial facility.

Two considerations related to the end use of RO-treated water

Reverse Osmosis System Parameter #1: In power generation facilities, the permeate is typically the expected water stream. More than one system design may be required to ensure that the end product is of the specified purity. Other considerations may include the redundancy of the RO, such as the fact that some trains can be removed for cleaning or membrane replacement, boiler make-up water requirements versus RO flow rates, and the need for RO tanks for upstream RO feed water and downstream permeate water.

Reverse Osmosis System Parameter #2: Multiple stages may be required if the discharge is the desired product. In power plants, the effluent and sometimes the cooling tower discharge can be concentrated with multiple stages of reverse osmosis to reduce the total volume of water that must be treated to achieve the final effluent standard. To view a diagram of a two-stage reverse osmosis system, click here.

4 Reverse Osmosis Feedwater Characteristics and Variability Parameters to Consider Reverse Osmosis feedwater must meet certain criteria. If it does not, the performance of the reverse osmosis membrane deteriorates and it may quickly become contaminated, require excessive and expensive cleaning, or become so damaged that it must be replaced prematurely. When this happens, the quality and yield of the permeate water is reduced.

In addition, attention must be paid to fluctuations in the plant’s water supply to the reverse osmosis system. Surface water varies with the seasons, and during spring runoff, turbidity levels can be well in excess of 500 Nephelometric Turbidity Units (NTU). In addition, even well water can vary in its dissolved solids content.

Reverse Osmosis System Parameter #3: What are the seasonal variations in dissolved solids, chemical oxygen demand (COD), color, turbidity, temperature and suspended solids in plant service water and can treatment units upstream of the reverse osmosis system handle this variation?

Reverse Osmosis System Parameter #4: For surface water sources, how much does the plant’s service water change during spring runoff and lake turnover? Turnover occurs twice a year when the water temperature in the lake exceeds 40 degrees F [4.4 degrees C], the maximum water temperature. During this turbulent period, the soil and silt at the bottom of the lake are stirred up, resulting in a significant increase in suspended sediment and turbidity.

Reverse Osmosis Plant Parameter #5: How stable is the water quality for a newly drilled well? Total suspended solids may be stable, but total dissolved solids may vary throughout the season and the life of the well.

Always test Reverse Osmosis System Parameter #6: Silt Density Index (SDI). The sludge density index is a measure of the tendency of the water supplied to the reverse osmosis system to become contaminated. In general, SDI should be less than 5 for spiral RO systems and less than 3 for hollow fiber RO systems. If necessary, investigate the particle size distribution of suspended/colloidal solids in the plant’s service water and RO feed water.

A detailed discussion (including tables and drawings) of reverse osmosis membrane design for the power industry and other industrial applications can be downloaded from our free 11-page white paper, 11 Issues to Consider When Purchasing a Reverse Osmosis System for a Power Generation Facility.

To view a narrative slide show on industrial reverse osmosis membrane design

As a leader in reverse osmosis (RO) system development, Rainn Christensen has the expertise to design and build RO systems to meet all of your plant’s water needs. In addition to RO, Rainn Christensen’s Water Treatment Division R&D team is focused on improving and expanding water treatment methods and tackling the toughest challenges head-on with innovation.

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