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

How to calculate Anti-Scalant Feed Dosage?

Posted by Julie Nemeth-Harn on Jan 11, 2021 10:15:00 AM

There exists a potential for calcium, barium, strontium, fluoride and silica compounds to precipitate in the concentrate or brine channels of the reverse osmosis membranes. Precipitation occurs when the solubility limits of these various salts and silica is exceeded. 

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Topics: membrane treatment system, membrane treatment, water treatment, scale inhibitor

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

Membrane Water Treatment: A Simpler and More Cost- Effective Process Than You May Think

Posted by Julie Nemeth-Harn on Dec 21, 2020 11:44:00 AM


Membrane filtration can be explained as a method of allowing certain materials to permeate a surface while blocking others. For water, this means allowing clean water to flow through the membrane while eliminating sediments and other materials or pathogens. Membrane filtration is a multiple-step process which is considered to be one of the most cost-effective water treatments available.

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Topics: membrane filtration, membrane treatment system, reverse osmosis, membrane treatment, water treatment, membrane plants, save money, water treatment plant

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

Control Narrative: How Do Water Treatment Plant SCADA & RO Membrane Treatment Systems Communicate?

Posted by Julie Nemeth-Harn on Nov 2, 2020 9:00:00 AM

The following is a brief narrative describing the intended control strategy between each a Reverse Osmosis (RO) train and the water treatment plant SCADA system. 

It describes the control system we will supply and outlines the basic operation of a Reverse Osmosis skid and the required handshaking with the water treatment plant SCADA system. This narrative in no way encompasses all of the responsibilities of the water plant SCADA as we are not familiar with all of the requirements of the end user.

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Topics: membrane filtration, save water, save money