Harn R/O Systems Blog

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

What is the Reverse Osmosis Equipment Manufacturer's (ROEM) Role in Membrane Water Treatment?

Posted by Julie Nemeth-Harn on Feb 14, 2020 11:00:00 AM

In conventional construction projects there are three main parties: the water treatment plant owner, the engineer, and the contractor. In specialized process projects a system supplier with particular expertise on the process is also usually involved. This party is also called an Original Equipment Manufacturer (OEM). For membrane treatment projects this entity is commonly called the Reverse Osmosis Equipment Manufacturer (ROEM) or the Membrane System Supplier (MSS). The ROEM or MSS may have a separate contract with the water treatment plant owner, or they may be a subcontractor to either the engineer or the main general contractor.

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Topics: membrane treatment system, reverse osmosis

Use Variable Frequency Drives to Save Energy in Membrane Plants

Posted by Julie Nemeth-Harn on Jan 17, 2020 1:35:00 PM


Variable frequency drives (VFD) are becoming the popular choice for many industrial processes that need to make use of motors with changing speeds. In membrane plants, these motors are used to feed the pressure and flow of the water as it moves through the various areas of the treatment cycle.

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Topics: membrane filtration, membrane treatment system, membrane treatment, water treatment, membrane plants, vfd, water purification process, save money, water treatment plant

How Do I Know I’m Getting the Best Value on My Membrane System?

Posted by Julie Nemeth-Harn on May 1, 2019 3:11:29 PM

Water treatment membrane systems are complex. Even after the technical design is finalized, it can be difficult to assess cost versus value. We all know from purchasing anything from shoes to washing machines that the cheapest product probably won’t provide us the best value.

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

8 Simple Steps for Performing a Successful Membrane Installation

Posted by Julie Nemeth-Harn on Feb 28, 2019 12:48:10 PM

Membrane Installation Components

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

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

Posted by Julie Nemeth-Harn on Apr 24, 2018 11:25:00 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