Many owners and operators of traditional decentralized municipal wastewater treatment plants, also referred to as on-site or off-grid treatment, are acutely aware their systems are at risk of becoming obsolete.
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 2008 Texas was facing an extended drought and the City of San Angelo was weighing its alternatives. The City felt the Hickory Aquifer well field was the best water option available, but this water contained significant amounts of radium and iron.
The City of Silverton is known as Oregon’s Garden City and sends one million gallons a day of treated effluent to the Oregon Gardens, returning the remainder to Silver Creek.
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 May 2014, Wichita Falls, Texas found itself under a stage 5 drought catastrophe ranking during the second worst drought in the city’s history.
Since 1996, a wastewater treatment plant serving the Town of Cave Creek, AZ, has drawn numerous complaints from residents and reached the end of its useful life. Located in the middle of an affluent neighborhood with minimal setbacks and minimal odor control, the plant was considered both an eyesore and a source of noxious odor, particularly to golfers playing on an exclusive course located nearby.
Stanley Consultants has been awarded two Engineering Excellence awards for design of the wastewater treatment expansion at the South Plant in Iowa City, Iowa.
Biwater have been awarded a contract to design, supply and supervise the installation and commissioning of both ultrafiltration (UF) and reverse osmosis (RO) systems for the Groundwater Reliability Improvement Program (GRIP) advanced water treatment facility being constructed in Pico Rivera, Southern California.
Ecolab Textile Care has signed an exclusive global agreement with Wisconsin based OMNI Solutions for its Smart Ultraviolet Light Advanced Oxidation System technology for commercial laundries.
WE&RF recently signed a contract with MWH Americas Inc. to advance the science of peracetic acid (PAA) disinfection, as well as to examine design, implementation, and operational considerations.
The Swedish ozone generator manufacturer Primozone has been elected to join the American Water Works Association’s ozone standards committee.
De Nora's global water and wastewater treatment business will exhibit at the 2017 American Water Works Association's Annual Conference & Exhibition taking place June 11-14 in Philadelphia.
The City of Oceanside’s “Pathogen Removal Study” was recognized at the White House Water Summit held on March 22 to commemorate World Water Day.
Ovivo Inc. (“Ovivo”) signed an unprecedented, multi-year agreement, with Microdyn-Nadir (‘’Microdyn’’) to service the membrane bioreactor (MBR) market.
Ozoniers.com, a brand of Qingdao Danjia Machinery, is solely into wastewater treatment research and development.
Xylem, a leading global water technology company focused on addressing the world’s most challenging water issues, has won a contract valued at approximately $2.75M to supply Xylem’s Wedeco-brand ultraviolet (UV) technologies to a wastewater treatment facility in the Vigo region of southwest Spain.
The Environmental Engineering and Microbiology Group (GEMMA) of the Universitat Politècnica de Catalunya (UPC) is investigating how to produce new energy resources and high-value products from wastewater of urban, industrial and agricultural origin through the European project INCOVER.
A Fall River, Mass. company has taken significant steps to make its chemical manufacturing, warehouse, and distribution facility safer following an Administrative Compliance Order issued by EPA in March 2014 that identified several dangerous conditions arising from the company’s use, storage and handling of chlorine and ammonia.
NeoTech Aqua Solutions, Inc., the industry leader in High-Efficiency Ultra-Violet (UV) water treatment systems, announces its first exclusivity agreement, signed with Bluewater Bio International, a leading global provider of innovative, high performance water and wastewater treatment technologies.
The International Ultraviolet Association (IUVA) has revised the dates for the 2019 IUVA World Congress, which will now take place February 10-13, 2019 at the University of New South Wales (UNSW) in Sydney, Australia.
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.
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.