The De Nora blog: Water Made Easy

ClorTec® for Municipal Water and Wastewater Facilities

Aug 10, 2021 4:15:33 PM / by Dave McWalters posted in water treatment, CloreTec, oil and gas, produced water treatment


Concerned About Future Bromate, Chlorate, and Perchlorate EPA Regulations? Feeling the Pressure to Reduce Operating Expenses? Take A Look at a New ClorTec Retrofit Program from De Nora. by Dave McWalters
It’s clear that water and wastewater companies want disinfection and oxidation equipment that’s robust, serviceable, able to get up and running quickly, and provides access to knowledgeable technicians in a timely manner. Over the years, De Nora has provided all of that—and the peace of mind that comes from a track record of product reliability and excellent service. We continue to provide a variety of services to our hypochlorite generators with quality, capable technicians. What we didn’t have until recently; however, was an upgrade program to retrofit our older equipment with newer technology. The EPA’s recommended bromate, chlorate, and perchlorate limits, while not a regulation currently, coupled with increasing operating expenses driven by the high cost of salt, have caused many of us in the industry to wake up and take a programmatic look at addressing this burgeoning need. That’s why we created a new retrofit program to upgrade De Nora systems. This program called ClorTec Gen III is specifically designed for those systems that handle volumes of 450lbs/day or more and are over five years old, basically a generation prior to the most current technology.

Consider our ClorTec Gen III program to see how it may apply to your facility. As with any service program, our technicians will first conduct an on-site survey to understand the condition, age, capacity, and any issues with your current equipment. Then we’ll recommend one of several upgrade kits to make your system compliant with the current Gen III technology. Our scope of work may include some combination of the following equipment: Gen III Hypo Generator Rack (with or without cells), replacement of acrylic cells with PVC/FRP cells, upgrading or replacing your control panel, replacing the rectifier (whether air or oil coiled), and/or adding a water chiller. In addition to a complete 20-point system service check, we will include a warranty (standard or extended) and a maintenance agreement to keep your new system up and running reliably.

Your ‘new’ ClorTec Sodium Hypochlorite Generator will provide a number of important benefits. Safety: with less than 1% chlorine concentration and the lowest disinfection by-product impact available today. Lower Operating Costs: with the most efficient OSHG available requiring the lowest amount of salt, as well as low maintenance and service costs. Reliability: with a simple system design, quality parts, and long electrolyzer life. Green Footprint: with the lowest carbon footprint impact and no plastic packaging of chemicals. All of this is backed by De Nora, a leader in OSHG with over 6000 installations, cutting-edge innovation and research, and worldwide R&D and support.

As an example, one of our customers, the second largest provider of potable water in Cobb County Georgia, relies on two water treatment facilities to prepare water for wholesale distribution to 11 retail water suppliers, as well as industry and institutional customers. The historic use of chlorine gas became a potential concern not only in Georgia, but across the entire county. Their first installation of a ClorTec system, supplying 1500lbs/day of sodium hypochlorite, eliminated the need for bulk chemical storage and lowered its disinfection byproducts. Today, with three generators, two operating at a time, the latest high-efficiency Gen III upgrades are well received, providing 7-9 hour run times and excellent production of potable water for its satisfied customers. In addition, the new instrumentation panel with analog signals enables them to have greater flow control, better diagnostics, and peace of mind.

Get ahead of upcoming EPA regulations, lower your operating expenses, and benefit from the safety features available through De Nora. Contact xxx to get more information about the new Gen III retrofit/upgrade program or any of our service and support options for ClorTec customers.

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ClorTec® Electrochlorination: The Water Treatment of Choice for Upstream and Midstream Applications - Interview with Andrew Boal, PhD

Jul 20, 2021 2:57:41 PM / by Andrew Boal, PhD posted in water treatment, CloreTec, oil and gas, produced water treatment


De Nora’s product and industry expert, Andrew Boal, has a PhD in organic chemistry, having spent the earlier part of his career at Sandia National Labs and NASA doing research in nanotechnology and looking for life on other planets before joining the water industry. So, you may be wondering why he’s uniquely qualified to advise our Oil & Gas customers on how to best treat oilfield water at various stages of the production process. Today, his scientific mind is being applied to developing novel approaches to Oil & Gas water treatment, particularly for midstream companies and produced water recycling opportunities. As Andrew would say, “Think of produced water as a valuable resource, not an operational waste product.”

De Nora’s focus for the Oil & Gas industry has always been on disinfecting freshwater used in hydraulic fracturing; however, there has recently been increasing demand for midstream water management, because of the scarcity—and value—of fresh water. Since this is one of the more complex areas of water treatment, De Nora relies on experts like Andrew to address these challenges. “The makeup of this water is very complicated—much more so than at a municipal water treatment plant or cooling tower.” He further explains, “With hydraulic fracturing, you get 9-10 barrels of produced water for every barrel of oil, and that produced water needs to be disposed of elsewhere.” It is estimated that in the U.S. onshore environment, up to 20 billion barrels of water are produced every year, along with hydrocarbons. This water is injected into either producing wells for enhanced oil recovery or into saltwater disposal wells. Pure volume is just one of the reasons that the demand for recycling has increased exponentially.

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SORB™ Technology Addresses Environmental, Regulatory, and Public Health Water Treatment Challenges

Jun 9, 2021 12:16:02 PM / by Nick Armstrong posted in water treatment, SORB, drinking water, Water filtration


Get to know De Nora expert, Nick Armstrong, Global Product Manager for the SORB™ family of products. With 15 years of experience under his belt, he recently joined De Nora from a background in the high purity industrial water space—providing solutions for pharmaceutical, semiconductor and power plant applications all over the world. His field is one where extreme purity counts. Now at De Nora, he’s managing our SORB contaminant removal line—targeting specific contaminants, like arsenic, iron, and manganese—as well as working toward developing new approaches to address emerging contaminate concerns globally. Today, Nick brings his passion for innovation to our entire SORB™ portfolio of solutions.

Worldwide, the need to convert contaminated water sources to usable water is growing. By 2025, an estimated 1.8 billion people will live in areas plagued by water scarcity, with two-thirds of the world's population living in water-stressed regions as a result of use, growth, and climate change. With De Nora’s long standing history and excellent reputation as a innovator in water treatment technologies, we have the process knowledge, experience, and capabilities to specify, install, and maintain your passive arsenic adsorption system.

Keep Your SORB System in Prime Condition
Engineers, site managers, and maintenance personnel alike understand that proper operation and minimal maintenance of a treatment facility is critical. With our process guarantee, we can ensure optimal performance of a system for many years between media exchanges. That’s where our knowledge and service offerings come in. When you are ready, we can perform a complete media changeout, arranging for everything at your site in an efficient manner. We vacuum out the exhausted media, dispose of it at a landfill, and then commission your system so it’s ready for use. Regardless of whether or not we provided your initial system, we can extend our process guarantee with our service.
Contact us for a quote.

About SORB 33
De Nora SORB 33® is a granular iron oxide media, specifically made for the removal of arsenic thru adsorption. Our SORB 33 systems employ a ‘pump and treat’ process that flows pressurized well or spring water through a fixed-bed pressure vessel containing the media where the arsenic removal occurs. SORB solutions are available in a range of sizes and configurations—designed to treat your specific flow rate and quality expectations.

Your media life will typically range from 6 months to 6 years, depending on water quality levels. Media usage, however, can be optimized in multiple parallel flow adsorber systems through staging, whereby each adsorber is staggered so one is operating in the latter stages of its life.

Although these systems are simple to operate, owners should consider a De Nora service agreement to support the most effective operation of the system and undertake media change-out when required.

The De Nora Commitment
With over two decades of demonstrated effectiveness, De Nora SORB adsorption and ion exchange systems can help solve environmental, regulatory, and public health water treatment challenges and is a best available technology (BAT) for many contaminants of concern. The innovation team at De Nora is continually seeking process improvements and are in a constant state of development to offer our customers even greater efficiencies.
To keep informed about the latest trends, follow Nick on LinkedIn.

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Best Practice: Effective Maintenance of your Capital Equipment

May 25, 2021 6:01:03 PM / by Dave McWalters posted in water treatment, wastewater treatment, Water Parts and Service


An investment in drinking water and wastewater systems is undertaken to protect public health and the environment. The decision to move ahead on a capital project is one that should not be taken lightly. Whether you are designing a new facility or upgrading an older site, any capital investment, should include the implementation of measures to protect that capital investment. The most effective way to protect an equipment purchase is to follow manufacturer-recommended maintenance and service procedures and schedules.  Download our Checklist using the form on this page to keep your equipment in tip top shape.

An equipment purchase is effectively the start of a long relationship between the purchasing company and manufacturer, going well beyond the installation, start-up and commissioning of a system. As a result, it’s important to focus on the service and maintenance a manufacturer offers throughout the life of the equipment. A simple review of the service offerings will help ensure a partnership with a manufacturer that understands what is required to effectively support their system.

Water and wastewater system operators play an important role in ensuring reliable water and wastewater equipment performance. Proper operation and maintenance of water and wastewater treatment equipment depends largely on the operators and the training they’ve received to support the equipment. Equipment-specific training from a manufacturer at start-up and routinely throughout the life of the equipment is important, especially given the high turnover rate of trained and experienced operators at water and wastewater treatment facilities.

From an operation and maintenance perspective, some of the common deficiencies affecting the ability to follow manufacturer-recommended procedures and schedules include:

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When Marine Sewage Treatment Systems in Offshore Oil & Gas Operations Don't Really Treat

Sep 22, 2020 3:56:00 PM / by Dana Casbeer posted in marine, water treatment, De Nora, Sewage treatment, Offshore, maintenance


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Marine Sewage Treatment Plants for Offshore O&G: The Dilution Falsehood

Sep 17, 2020 9:00:00 AM / by Dana Casbeer posted in marine, water treatment, Sewage treatment


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When Sludge Goes Bad: Marine Sewage Treatment ‘Class B’ Sludge Production

Sep 3, 2020 10:30:00 AM / by De Nora posted in water treatment, De Nora, Sewage treatment


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Why Adsorption is the Perfect Technology for Removing Arsenic From Groundwater

Aug 25, 2020 10:15:00 AM / by De Nora posted in water treatment, arsenic, ground water, adsorption


There are various options available for removing arsenic from groundwater; these processes range from ion exchange and activated alumina to reverse osmosis, coagulation and filtration. Each of these technologies have their own pros and cons, but in cases where arsenic treatment is the main treatment objective, adsorption is the ideal technology from a cost and ease of operation standpoint. 

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Technical Data — Safe Handling of Chlorine Gas

Aug 13, 2020 8:44:00 AM / by De Nora posted in water treatment, De Nora, gas feed, chlorine gas


The safe handling of chlorine gas and a secure chlorination system includes a proper facilities design, an operation and maintenance program, the appropriate safety equipment and an emergency action plan. The following, while not all-encompassing, will cover the chemical and physical characteristics of chlorine, as well as the many safety steps and procedures that must be followed to keep your facility safe.

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Operation and Maintenance Costs for Chlorination

Aug 6, 2020 5:15:00 PM / by De Nora posted in water treatment, drinking water, chlorination, gas feed


Chlorine is commonly available in three different forms: gaseous chlorine, calcium hypochlorite, and sodium hypochlorite, which are all used in chlorination.

Gas chlorine is typically packaged in 150 lb cylinders and 1-ton containers. This is 100% elemental chlorine stored as a liquified gas under pressure. The chlorine is fed to the process using a pressure feed system which applies the chlorine gas directly to the process or a vacuum operated - solution feed system which uses a water operated ejector to create a chlorine solution which is applied to the process.

Calcium hypochlorite is typically packaged as a solid tablet containing 60% active chlorine. The chlorine is fed to the process using a simple tablet feeder that passes the process water through a tube of tablets, causing the tablets to dissolve into the water. More sophisticated tablet systems dissolve the tablets in water making a solution of controlled chlorine concentration, which is then fed to the process using a chemical dosing pump.

Sodium hypochlorite is a liquid containing 12-15% active chlorine when fresh. Sodium hypochlorite is typically delivered to plant storage tanks by truck and applied to the process using chemical dosing pumps. With this form of chlorine, the concentration decays over time.

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