The Chief Operator for a surface water treatment plant (SWTP) reports that replacement of a troublesome vacuum liquid feeder for poly aluminum chloride (PACl), with a more advanced vacuum liquid feeder, ended the threat of a process upset for operations staff that was caused by the previous unit not being able to hold a constant feed rate. The ability to provide a consistent feed is needed as a key element in the plant pre-treatment process, which features turbidity reduction and clarification.
In the past several years, Aquarion Water Company had been monitoring their system’s THM formation and attempting to lower them through treatment and distribution system changes. Aquarion engineers decided that reducing THM formation in the Laurel High Service Clearwell at the Stamford Water Treatment Plant (WTP) would eliminate concerns of elevated THM formation in the distribution system served by the WTP.
In late 2005, the City of Newberg, Oregon, decided to upgrade their water treatment plant disinfection process from gas chlorine to on-site hypochlorite generation (OSHG) in an effort to simplify operations and increase operator safety. The plant produced an average of 2.5 million gallons per day (MGD), with a peak capacity of 5 MGD.
The Baia Mare Aurul gold mine in North Western Romania suffered a historic catastrophe in January 2000, when its dam burst, streaming out 100,000 cubic meters of waste water, largely contaminated with cyanide, commonly used in the process of mining gold, into tributaries of the Tisza River, a major waterway in Hungary.
In an effort to lower operational costs and extend the life of the dewatering centrifuge, operators in Springboro, OH, began to look at the polymer activation equipment in use at the plant. The Polyblend® M-Series emulsion polymer activation systems had been in steady operation for over 10 years. The equipment still performed reliably, but operators were interested in ways to achieve greater efficiency. They were aware of the new Polyblend® Magnum mix chamber, with its enhanced two-zone mixing energy.
The Hagerstown Wastewater Treatment Plant in Maryland incorporated several plant modifications, one of which was the conversion of their disinfection process from the use of ozone to UV.
The Lariana Depur wastewater treatment plant in Fino Mornasco, Italy, treats wastewater from multiple textile manufacturers in the Como region, known as the heart of the textile industry. Since 1994, ozone has been used effectively as a polisher to remove the dark blue-purple color — the result of the dyes used in the textile dyeing and printing process — from the water.
Installing and operating an ozone oxidation system for wastewater remediation at a gold mine located in a remote region of Alaska is full of challenges.
Chatsworth Water Works Commission provides both water and wastewater services to the 5,000 residents of the cities of Chatsworth and Eton, GA.
In April 2013, City Utilities started up three Microclor Model MC‐1500 skid systems, each rated at 1,500 pounds per day of free available chlorine.
The Cheyenne Board of Public Utilities (BOPU) operates the water and wastewater systems for the capital of Wyoming which has a population of more than 63,000. Located in the fast growing Front Range Urban Corridor, BOPU is challenged by growth, periodic water scarcity and aging infrastructure.
In 2017, a municipal water treatment plant was commissioning a new elevated tank. The tank had been cleaned, flushed and disinfected, but initial test results indicated unacceptable water quality. After a second cleaning, the tank was refilled and water samples were sent to the lab for follow-up testing.
Fednav Limited, the largest Canadian operator of international ships in the Great Lakes-St. Lawrence Seaway system, recently announced an order for 12 ballast water treatment systems to equip its ships currently under construction.
Ultraviolet (UV) treatment specialist Hanovia and the Industrial Division of its US sister company Aquionics have launched a new UV Application Center in Shanghai, China.
Aqua-Aerobic Systems, Inc. (Loves Park, IL) and Pinnacle Ozone Solutions, LLC (Cocoa, FL) have signed an agreement that confirms Aqua-Aerobic Systems as the exclusive municipal distributor for Pinnacle’s ozone generation systems.
In many parts of the world, the only way to make germy water safe is by boiling, which consumes precious fuel, or by putting it out in the sun in a plastic bottle so ultraviolet rays will kill the microbes.
PeroxyChem, a global manufacturer and supplier of peroxygen chemistries, obtained final acceptance from the City of Memphis to start operation of its peracetic acid (PAA) disinfection system at the Maynard C. Stiles Wastewater Treatment Facility in Memphis, Tennessee.
With accelerating global concerns about the need for water and air purification solutions, the International Ultraviolet Association (IUVA) announces the 2017 IUVA World Congress, September 17-20, 2017 in Dubrovnik, Croatia.
Pasteurization Technology Group (PTG), innovator of the only wastewater disinfection process that creates renewable energy, is exhibiting its technology to water and wastewater professionals attending this year's 86th Water Environment Federation's Annual Technical Exhibition and Conference (WEFTEC), held in Chicago.
De Nora, a leading designer of safe, innovative, and sustainable water disinfection and oxidation, filtration and electrochlorination solutions, will supply water disinfection systems forten water treatment plants to the Water Supplies Department of Hong Kong S.A.R.
Xylem has been awarded a contract to provide an existing wastewater treatment plant with advanced treatment technology, which will play a key role in an initiative focused on improving water quality in the Chesapeake Bay.
After successful completion of land-based tests with marine, brackish and fresh water – all using the current ballast water treatment system design – a test report package for PureBallast has now been finalized by the independent lab DNV GL.
Kruger Inc., a Veolia business unit specialized in water treatment solutions for municipalities, will provide design services, process equipment and commissioning support to the Design Build Team of PC / CDM Smith as part of a contract from the District of Columbia (DC Water) to install its ACTIFLO® technology to process and treat wet weather flows.
The International Ultraviolet Association (IUVA) is proud to announce the dates and location for the 2019 IUVA World Congress, taking place February 3-6, 2019 at the University of New South Wales (UNSW) in Sydney, Australia.
Parkson will showcase their innovative water and wastewater treatment equipment via virtual reality at WEFTEC, the Water Environment Federation’s 90th conference to be held in Chicago, IL (exhibition October 2-4).
The Jacobi Carbons Group announced recently that its Nattandiya, Sri Lanka production facility has received certification from the Water Quality Association (WQA) under WQA/ASPE/ANSI Standard S-802: Product Sustainability for Activated Carbon.
A multinational food manufacturer was experiencing problems with the sodium hypochlorite feed, commonly known as bleach or liquid chlorine, used for disinfection in its Nebraska factory.
Chemists have found a way to use sunlight to purify wastewater rapidly and cheaply, and to make self-cleaning materials for buildings.
Xylem Inc., a leading global water technology company focused on addressing the world’s most challenging water issues, has introduced new performance-enhancing Wedeco Ecoray Upgrade Kits that can reduce the energy consumption of an ultraviolet (UV) disinfection system by up to 30 percent*.
Wastewater disinfection takes place after primary, secondary and sometimes tertiary wastewater treatment. It is typically a final step to remove organisms from the treated water before the effluent is released back into the water system. Disinfection prevents the spread of waterborne diseases by reducing microbes and bacterial numbers to a regulated level.
A variety of physical and chemical methods are used to disinfect wastewater prior to it being released into natural waterways. Historically, the chemical agent of choice for municipal wastewater treatment has been chlorine, due to its disinfecting properties and low cost. However, the rising cost of chlorine and concerns that low chlorine concentrations can still be toxic to fish and other wildlife, has given rise to more physical methods of wastewater disinfection being adopted such as ozonation or ultraviolet (UV) light.
The use of ozone as a disinfection agent has the added benefit of increasing the dissolved oxygen content of the treated wastewater. However, because the ozone has to be generated, ozonation can require prohibitive up-front capital expenditure compared to traditional chlorination. UV disinfection has been growing in popularity as a wastewater disinfection method, in large part because of the life-cycle economics of the equipment and the fact that, like ozone, there is no toxic residual.