The De Nora blog: Water Made Easy

Innovative Water Treatment Plant Features Microfiltration, Solar Power – and Gas Chlorination

Aug 27, 2020 10:30:00 AM / by De Nora posted in De Nora, chlorination, gas feed, San Benito


In 2009, the city of San Benito, TX completed the construction of a new six-million-gallon-per-day (MGD) microfiltration plant, which replaced a plant that had been in operation since 1928. The new facility is considered one of the most modern and innovative water treatment plants in the region and has been recognized for its use of microfiltration and solar power. Its chlorination system, while more traditional than these technologies, was selected for its cost-efficiency, reliability and flexibility.

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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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How to Prolong the Life of Your Gas Chlorinator

Jul 23, 2020 8:38:00 AM / by Stanley Shima posted in water treatment, De Nora, chlorination, gas feed, chlorine gas


In today’s credit-crunched, bottom-line-oriented economic environment, utilities in the water and wastewater sectors are scrapping plans to replace old equipment with new technologies and are looking for ways to improve existing equipment performance with system upgrades. 

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Can innovation be achieved with a tried-and-true disinfection technology?

Jul 2, 2020 8:21:00 AM / by William Stimeling posted in Insider, De Nora, chlorination, gas feed, chlorine gas


Since chlorine technology was first used in the US to disinfect drinking water in Jersey City, NJ, in 1908, most waterborne diseases have been eliminated in the U.S. Chlorine is still the most common disinfectant for drinking water and wastewater. Chlorine is also used for disinfection and as a biocide in numerous industries.

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On-Site With Sodium Hypochlorite Generation

May 5, 2020 11:21:00 AM / by De Nora posted in water treatment, Clortec, sodium hypochlorite, chlorination


Chlorine has long been a reliable tool in the water and wastewater treatment industry. It is one of the most widely-utilized chemicals in the space, and as such, there is no shortage of solutions for obtaining and applying it.

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