Harn R/O Systems Blog

Why Daily Data Collection is Important and What Parameters to Use to Monitor Your Membrane System

Posted by Julie Nemeth-Harn on Jan 18, 2021 9:00:00 AM

An important part of operating membrane systems is accurate data collection on a daily basis.  The data will help predict normal maintenance schedules and will help determine the cause of any system upsets.  Comprehensive data is very useful in determining when the membranes need to be chemically cleaned, or eventually replaced. It also alerts the operator to changes taking place such as fouling, leaking “O” rings etc.

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Topics: membrane treatment system, membrane treatment, water treatment, water quality, silt density index

8 Simple Steps for Performing a Successful Membrane Installation

Posted by Julie Nemeth-Harn on Dec 28, 2020 9:00:00 AM

Membranes are loaded from the feed end of the pressure vessel. To better understand the installation procedure, the following definitions are helpful:

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Topics: membrane treatment system, membrane treatment, water treatment, water quality

How to Complete a Silt Density Index (SDI) Test and Why it's Important

Posted by Julie Nemeth-Harn on Nov 16, 2020 9:45:00 AM

It is important to check on the level of semi-colloidal suspended solids in the feedwater to RO systems. The level can be estimated (not measured absolutely) by the Silt Density Index or SDI test which measures the blocking rate of a 0.45 micron filter pad under controlled pressure conditions.

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Topics: water quality, ro calculations, silt density index

How to Calculate Percent Recovery and What Affects it in a Membrane Treatment System?

Posted by Julie Nemeth-Harn on Oct 5, 2020 1:10:00 PM

Membrane systems operating at 82% recovery will convert 82% of the total raw water input into treated permeate, with the remaining 18% being sent to waste as concentrate (or reject). The recovery rate is monitored using flow meters installed in the permeate and concentrate piping.

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Topics: membrane filtration, membrane treatment system, membrane treatment, water treatment, membrane plants, water quality, ro calculations

4 Reasons You Need to Replace Your Conventional Water Treatment

Posted by Julie Nemeth-Harn on Sep 8, 2020 11:15:00 AM


Water quality and purification processes have improved greatly over recent years alongside the demand for drinkable water which has also increased. Today’s membrane treatment plants can be tailored to fit specific needs and the membrane treatment methods used can reduce contaminants more than ever before. Where the desired outcome is stable, clean water with an appreciable return on the investment, upgrading to a membrane water treatment system is backed by cutting edge industry science.

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Topics: membrane treatment system, water treatment, water quality, water purification process

How Much Water on Earth is Drinkable?

Posted by Julie Nemeth-Harn on Jun 23, 2020 8:30:00 AM

Water is one of the most important commodities that supports life on earth but very few understand how hard it is to get clean, potable freshwater. Water, in all its forms, covers three quarters of the Earth's surface. The water levels on Earth remain relatively the same each year. Every day, water goes through a cycle that sees it flow from land, to the seas and then evaporates into the atmosphere through the processes of evaporation and precipitation.

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Topics: membrane filtration, membrane treatment system, reverse osmosis, membrane treatment, water treatment, clean drinking water, membrane plants, water recycling, water quality, water purification process, save water