WASTEWATER DISINFECTION WHITE PAPERS & CASE STUDIES

Kansas Wastewater Treatment Plant Makes A Long-Overdue UV System Upgrade (Case Study)
Kansas Wastewater Treatment Plant Makes A Long-Overdue UV System Upgrade (Case Study)

The UV disinfection system at the Plant 20 Wastewater Treatment Plant was installed in 2002, but over the years staff continued to struggle with PLC and controls-related issues, ballast failures, and water level management. An overhead crane was needed to operate the water level management device, and water level fluctuations of 12” were common, which contributed to an increase in fouling on the quartz sleeves.

  • Dual Mixers Overcome Stratification And Prevent Ice Formation In Concrete Tank With Baffles
    Dual Mixers Overcome Stratification And Prevent Ice Formation In Concrete Tank With Baffles

    The climate in Southgate, Ontario, is considered cold and temperate with significant rainfall throughout the year. Temperatures in winter average around -10°C and can drop as low as -30°C to -40°C for brief periods of time, which can wreak havoc on the local water storage tanks and distribution piping. Read more to learn how the installation of PAX Mixers has kept the tanks free from ice and has shown an improvement in disinfectant residual levels.

  • Replacement Vacuum Liquid Feeder For Poly Aluminum Chloride Ends Feed Reliability Problem For SWTP
    Replacement Vacuum Liquid Feeder For Poly Aluminum Chloride Ends Feed Reliability Problem For SWTP

    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.

  • Removing Iron From Groundwater
    Removing Iron From Groundwater

    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.

  • One Million Gallons Of Wastewater Reused Daily To Irrigate Award-Winning Botanical Garden
    One Million Gallons Of Wastewater Reused Daily To Irrigate Award-Winning Botanical Garden

    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.

  • Connecticut Water Utility Successfully Removes 45% Of Trihalomethanes (THMs) With Quick-Turnaround Clearwell Intervention
    Connecticut Water Utility Successfully Removes 45% Of Trihalomethanes (THMs) With Quick-Turnaround Clearwell Intervention

    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.

  • Standardizing On-Site Hypochlorite Generation Disinfection Technology In Water And Wastewater Treatment Plants Increases Safety And Eases Operations
    Standardizing On-Site Hypochlorite Generation Disinfection Technology In Water And Wastewater Treatment Plants Increases Safety And Eases Operations

    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.

  • On-Site Sodium Hypochlorite Generation Replaces Hazardous Cyanide In Precious Metal Extraction
    On-Site Sodium Hypochlorite Generation Replaces Hazardous Cyanide In Precious Metal Extraction

    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.

  • Polymer Activation Equipment Upgrade Yields Consistent Polymer Savings Of Over 13%
    Polymer Activation Equipment Upgrade Yields Consistent Polymer Savings Of Over 13%

    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.

  • Pure Oxygen Injection Into A Pipeline
    Pure Oxygen Injection Into A Pipeline

    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.

  • Wastewater Plant In Como, Italy, Upgrades To De Nora Ozone For Significant Savings
    Wastewater Plant In Como, Italy, Upgrades To De Nora Ozone For Significant Savings

    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.

Mitigating Environmental Impact Of Gold Mine’s Wastewater Through Ozone Oxidation And Aquifer Re-injection
Mitigating Environmental Impact Of Gold Mine’s Wastewater Through Ozone Oxidation And Aquifer Re-injection

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.

More White Papers & Case Studies

WASTEWATER DISINFECTION PRODUCTS

SANILEC® 6 Portable Sodium Hypochlorite Generator SANILEC® 6 Portable Sodium Hypochlorite Generator

De Nora Water Technologies’ SANILEC® 6 system generates sodium hypochlorite wherever and whenever disinfection is required. These lightweight, extremely portable systems are designed for use in rural or isolated locations where water purification, waste treatment or surface disinfection is required. SANILEC 6 systems are ideal for use in areas where chemical storage creates a risk or in areas where other disinfectant chemicals are in short supply.

MEMCOR® Ultrafiltration Systems MEMCOR® Ultrafiltration Systems

Our membranes and membrane systems reflect the advancements that have been made in the industry over the past three decades.

VigorOx® WWT II Wastewater Disinfection Technology VigorOx® WWT II Wastewater Disinfection Technology

VigorOx® WWT II is a strong wastewater disinfectant for use in wastewater treatment that can replace chlorine or improve the performance of a UV system. VigorOx WWT II, a peracetic acid (PAA)-based formulation, is an equilibrium mixture of acetic acid (vinegar), hydrogen peroxide and water.

WEDECO TAK Series Open Channel Disinfection System by Xylem WEDECO TAK Series Open Channel Disinfection System by Xylem

WEDECO TAK Series Open Channel Disinfection System for wastewater applications.

Aqua ElectrOzone™ Ozone Generation System Aqua ElectrOzone™ Ozone Generation System

Ozone treatment for water and wastewater has been utilized successfully for several decades and continues to be a viable disinfection solution for both municipal and industrial plants, worldwide.

Capital Controls® CHLOR-A-VAC® Series 1420 Chemical Industion Unit Capital Controls® CHLOR-A-VAC® Series 1420 Chemical Industion Unit

The Series 1420 CHLOR-A-VAC® affords high efficiency addition and mixing of gases and liquid chemicals resulting in substantial chemical cost savings.

High Speed CSO Filtration System High Speed CSO Filtration System

As measures of improving the combined sewer system, this high rate filtration system filters the rain water, which flowed directly to the river before, by using our original filter media. This new treatment system can be installed in the existed facilities and supplies stable filtrations for rainfall flow fluctuation.

Capital Controls® Gas Feeder Series WM4000 Capital Controls® Gas Feeder Series WM4000

Capital Controls Series WM4000 gas feeders are wall cabinet mounted vacuum operated and designed to conveniently house a combination of gas feed equipment. The fibreglass cabinets enclose the gas flow control components.

More Products

WASTEWATER DISINFECTION PODCASTS

An Improved Approach To Turnkey Disinfection Solutions An Improved Approach To Turnkey Disinfection Solutions

Engineered skid systems provide a compact configuration chemical feed at water and wastewater treatment plants. While these all-in-one metering pump solutions bring tremendous value to their users, traditional platforms have their pitfalls.

The Expanding Role Of Ozone The Expanding Role Of Ozone

As water reuse becomes increasingly common, more utilities will get to know ozone. To explain its role in water treatment schemes, Water Talk welcomed Jim Lauria, Vice President of Sales and Marketing at Mazzei Injector Company, and Ben Kuhnel, Senior Project Manager for Arcadis. Learn how ozone works in concert with other processes to safely recycle water and treat contaminants of emerging concern — even in mobile/on-site applications.

Ozonia M and FiltraFast Provide New Options For Treatment Facilities Ozonia M and FiltraFast Provide New Options For Treatment Facilities

If you don’t need the performance of an ultrafiltration membrane but also want to avoid the large footprint of a conventional media filter, you might want to consider FiltraFast extreme rate compressible media filters. As Ryan Hess, Director of Advanced Separation with SUEZ Water Technologies suggests in this Water Talk interview, “They provide roughly ten times the hydraulic loading rate of conventional media filters.”

Getting Chlorine Disinfection Right Getting Chlorine Disinfection Right

Of all the process considerations facing wastewater treatment operators, disinfection is one of the most important. In this exclusive Water Talk interview, Gary Lohse, Technical Sales Manager, Disinfection with De Nora Water Technologies, discusses how disinfection has become increasingly complex over time. Lohse reviews a host of selection criteria including target microorganisms, control strategies, disinfection by-products, capex and safety.

Drumming Up Chemical Injection Drumming Up Chemical Injection

The operating ranges for chemical injection need to be large because of the variability of flow in many treatment operations. As Bill McDowell, Vice President of Operations with Blue White Industries explains in this Water Talk interview, “You might be down to as low as 5 or 10 milliliters a minute and then one hour later; you might need to pump 15 gallons a minute out of the same pump and through the same sensor.”

Decentralization Grows With Worldwide Property Development Expansion Decentralization Grows With Worldwide Property Development Expansion

One of the trends in water and wastewater treatment over the past decade has been a growing demand for decentralized systems. Water Talk recently caught up with Nii Mensah, General Manager of Fluence USA, to learn more about the solutions that the new company (formed by the merger of RWL Water and Emefcy) is bringing to market to address communities’ treatment needs

More Wastewater Disinfection Podcasts

WASTEWATER DISINFECTION VIDEOS

A Tradition Of Advanced Disinfection Continues (Video) A Tradition Of Advanced Disinfection Continues (Video)

Trojan Technologies has been providing treatment solutions for the water/wastewater market for four decades, but 2018 stands out as the year Stephen Bell joined as its new president. Water Online had opportunity to catch up with Bell at WEFTEC, where he talked about the company's culture, philosophy, and drive to innovate. One particular innovation is the TrojanUVFlex, a drinking water disinfection and advanced oxidation system for both potable and non-potable reuse applications, as well as the destruction of chemicals such as 1,4-dioxane. Tune in for an introduction to Bell and a summary of Trojan's unique technology.

Water: It Matters More Than Ever Water: It Matters More Than Ever

Water. It’s vital to human life, our economy, and ecosystem - the very survival of our planet. But water challenges are growing more intense than ever before. Increasing volatile weather patterns fueled by climate change, crumbling infrastructure, pollution, and over population that is causing a surge in the demand for water. This means the world’s supply of clean water is rapidly declining putting our future at risk.

Aqua-Aerobic Seminars – Where Professionals Learn And Solve Aqua-Aerobic Seminars – Where Professionals Learn And Solve

For more than 30 years, Aqua-Aerobic has provided thousands of industry professionals with education and training through the company’s highly-regarded technical seminar program. Our industry-known seminar is ideal for those individuals involved in the design, application, procurement and operation of water and wastewater treatment plants.

Sidestream Injection System With Pipeline Flash Reactor + Sidestream Injection System With Pipeline Flash Reactor +

CFD modeling was used to design, position and validate performance of the new, patented flow conditioning vanes and post-injection blending grid. The same, proven mass transfer mixing nozzles used in the original pipeline flash reactor (PFR), are also part of the PFR+.

Disinfection Solutions From De Nora Disinfection Solutions From De Nora

Daryl Weatherup, Managing Director at De Nora Water Technologies, gives an overview of De Nora's updated disinfection offerings, including its CAPITAL CONTROLS MCP ozone generator, CAPITAL CONTROLS Chlorinator, and ClorTec onsite hypochlorite generator. 

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WASTEWATER DISINFECTION NEWS

ABOUT WASTEWATER DISINFECTION

 

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.