Using Granular Activated Carbon To Meet DBP Regulations

The Roche Harbor Water Treatment Plant is located on the northwest side of San Juan Island in San Juan County, Washington state. Although a significant part of the land in the county is privately owned, the watersheds there provide a public benefit for both residents and visitors.  San Juan Island’s economy is tourist-driven; the island was voted #2 on the New York Times list of “41 Places to go in 2011.” Its marina has been a top boating destination for more than fifty years. Incorporated in 1886, the community has seen slow but steady population growth in recent decades. Roche Harbor Water System Inc. has been in operation since 1968 when PVC piping replaced the island’s existing wooden pipe system.


  • Using ‘TransMembraneChemiSorption’ (TMCS) For Ammonia Removal From Industrial Waste Waters
    Using ‘TransMembraneChemiSorption’ (TMCS) For Ammonia Removal From Industrial Waste Waters

    Dissolved gases like NH3, H2S or NOx in waste water lead to contamination in the sewage system and high treatment costs for municipal waste water treatment plants. 

  • White Paper: Impact Of HTA Dosing On Vent Stream Acidity Of An Acid Dosed MSF Plant As a part of the HTA dosing trial, a vent and distillate sampling system was designed to monitor acidity due to carbon dioxide in the MSF plant. This paper will discuss the results of the HTA dosing trial with respect to the effect on venting and corrosion.
  • Surface Water Treatment & LT2 Compliance - Surprise, Arizona (Case Study)
    Surface Water Treatment & LT2 Compliance - Surprise, Arizona (Case Study)

    The White Tanks Regional Water Treatment Facility (White Tanks) is located in Surprise, Arizona, and treats surface water from the Colorado River that is delivered by a 336 mile (540 kilometer) man-made canal.

  • Municipality Removes Biofilm, Improves Water Quality, Lowers Dosage With MIOX
    Municipality Removes Biofilm, Improves Water Quality, Lowers Dosage With MIOX

    Looking to reduce potential disinfection byproducts issues that new and difficult regulations were requiring, a Tennessee municipality began investigating alternative water treatment disinfection methods in an effort to reduce the potential liability (RMP) involved with using and storing gas chlorine. Within months of switching to a mix of oxidants (MOS), a difference was noted in the systems residual, residual was no longer dead spotting in low flow areas, and much higher residual was noted in areas that had been difficult to maintain At the end of the first year of operation the municipality had also documented a reduction in their disinfection byproducts formations, specifically both TTHMs and HAAs, which were both reduced by 50% in direct comparison with the quarterly results from the previous year.

  • Aquatech Supplies Zero Liquid Discharge For A 660 MW Gas Power Plant

    In December 2010, the Colusa Generating Station, a 660-megawatt power plant located near the town of Maxwell in Colusa County began commercial operation. This facility incorporates the latest technology and environmental design to reduce emissions and dramatically lower water usage compared to conventional natural gas power plants. 

  • Seawater Desalination At Rabigh Refinery Saudi Aramco’s RABIGH Refinery in Saudi Arabia wanted to install facility for 10000 TPD Seawater Desalination for the industrial use. The facility was supposed to be a BOOT (Build Own Operate Transfer) basis. By Aquatech International Corporation
  • Ozone Demand Testing = Disinfection Project Success
    Ozone Demand Testing = Disinfection Project Success

    Water and wastewater facilities are increasingly looking to ozone disinfection. A strong and indiscriminant oxidant, ozone can effectively address treatment issues with THMs and DBPs in the disinfection process. Ozone disinfection is also a proactive step toward addressing future rules on endocrine disrupting compounds (EDCs) and other trace organics at both water and wastewater plants. While there are many aspects to ozone disinfection system design, the single most important factor in project success is a thorough understanding of your facility’s ozone demand profile. This article provides an outline of the key factors to make your ozone demand test -and ozone project- a success. By Thoram Charanda and Louis LeBrun

  • New Media Reduces Cadmium From Electroplating Wastewater Discharge

    Cadmium has many industrial uses and is predominantly used in rechargeable batteries, in yellow and red pigments and is widely used in the aircraft industry electroplating applications due to the excellent resistance to corrosion for cadmium plated steel components.

  • Case Study: Optimized Quality Control In Mineral Water Plants
    Case Study: Optimized Quality Control In Mineral Water Plants Due to microbiological activity in the process, or to a lesser extent due to the reduction in nitrate levels in the raw water, nitrogen compounds may give rise to increased nitrite concentrations. By Endress + Hauser, Inc.
  • Case Study: Biological Filtration For Iron And Manganese Removal
    Case Study: Biological Filtration For Iron And Manganese Removal

    In an earlier paper, the author reviewed the physical and chemical processes conventionally used to remove iron and manganese from groundwater, and explained how the process most commonly used in France (aeration plus filtration) led to the discovery of coincident biological phenomena. These were subsequently applied to enhance the performance of certain existing units and, especially, to serve as a basis for a new generation of biological treatment plants offering sharply improved performance levels. These general considerations will be illustrated by a number of examples, selected from among nearly 200 existing facilities. By Pierre Mouchet, Manager of Technical Assistance and Information

More Drinking Water Treatment Case Studies and White Papers


More Drinking Water Treatment Application Notes


S Series

S Series

Shelco’s sanitary series housings have been designed for the most critical and demanding applications requiring purity and durability
C<sup>3</sup>500&trade;D Ultraviolet Disinfection System

C3500™D Ultraviolet Disinfection System

The C3500™D open channel series is an advanced, cost effective solution for the ultraviolet (UV) disinfection of wastewater using high powered (500W), low-pressure lamps.
Arsenic, Iron, And Manganese Removal By Filtration

Arsenic, Iron, And Manganese Removal By Filtration

Removal of Arsenic, Manganese, Iron, Fluoride, Radium and other Heavy Metals is a constant challenge for water purification plants.

Horizontal Filtration Trailer

Horizontal Filtration Trailer

The HFT is a high-capacity, trailer-mounted system designed to provide temporary water treatment in a wide variety of industrial and municipal applications

Reverse Osmosis (RO) Membrane Services

Reverse Osmosis (RO) Membrane Services

Evoqua Water Technologies' Membrane Care Program is a comprehensive service to keep your RO system operating at peak performance, saving you money. In addition to maintaining a large inventory of stocked replacement membranes, we offer services for RO membrane removal, installation and on-site or off-site reverse osmosis membrane cleaning.

Model 4200 Gas Vacuum Chemical Feeder

Model 4200 Gas Vacuum Chemical Feeder

The JCS Industries Model 4200 Gas Vacuum Chemcial Feeder mixes and feeds gaseous chemicals commonly used for water and wastewater disinfection accurately, reliably and safely.
More Drinking Water Treatment Products


  • Everything Old Is New Again
    Everything Old Is New Again

    As water treatment plant managers face relentless challenges — aging infrastructure, stricter watershed protection regulations, higher energy costs, growing water scarcity, and tighter budgets — solutions are emerging that blend computer-age technology with the tried-and-true practice of granular media filtration. By Jim Lauria, Senior Vice Director-Water Treatment, Bilfinger Water Technologies

  • Generating Disinfectants From Water: Could In Situ Electrolytic Production Be The Future?
    Generating Disinfectants From Water: Could In Situ Electrolytic Production Be The Future?

    Chemical disinfection using strong oxidants involves the transportation, storage, and handling of unstable and/or aggressive and hazardous chemicals. The production of oxidants at the location where they are to be used has therefore been a preferred option, especially in small-scale or remote installations. On-site electrolysis of NaCl for the local production of chlorine or hypochlorite, or the production of ozone-enriched oxygen by silent discharge has been standard for years.  However, it is possible to take the idea of producing chemical disinfectants locally a step further and look at in situ techniques, i.e. at devices, which produce oxidants in and from the water to be treated. By Dr. Samuel Stucki, Scientific Consultant to Innovatec Gerätetechnik GmbH,Germany

  • 9 Best Bets In Membrane Technology
    9 Best Bets In Membrane Technology

    A review of the most impressive, high-potential technologies featured at this year’s Membrane Technology Conference & Exhibition (AWWA/AMTA) in Las Vegas.

  • Maintaining Data Acquisition Capabilities Through Storms, Cyber Attacks
    Maintaining Data Acquisition Capabilities Through Storms, Cyber Attacks

    Not all technology holds up during a weather emergency. Electricity often fails, communication methods are compromised, and computer networks go offline.

  • Instrumentation: Dos And Don’ts For The Water Industry
    Instrumentation: Dos And Don’ts For The Water Industry

    To say that instrumentation, automation, and control are key to the modern wastewater industry is somewhat of an understatement.  With growing populations, tighter consent parameters, and the need to do more for less, operational efficiency is more and more important. 

  • Laboratory Analysis Demystified
    Laboratory Analysis Demystified

    Most people have no idea how critical getting a good sample is, and how hard it is in general to get really good data.  The analytical process for almost anything we test for has so many steps – each of which compounds any deviations or discrepancies made in the previous steps – that it’s vitally important to be as accurate and precise in each step along the way in order to get good, meaningful data in the end. By Patrick Vowell, Water Quality Engineer, Golden State Water Company

More Drinking Water Treatment Insights


The New IQ SensorNet Product Video

The New IQ SensorNet Product Video

The IQ SensorNet wastewater treatment process monitor is a powerful, modular system designed to be flexible enough to place anywhere in your wastewater treatment system and add to it at anytime.

Video: Amiad AMF Filters

Video: Amiad AMF Filters

The Amiad automatic microfiber (AMF) filtration system delivers filtration down to the 2-micron level without the use of disposable cartridges. Polyester microfibers wound tightly around specially designed cores capture suspended solids.
Mobile Combination Reverse Osmosis Treatment Service

Mobile Combination Reverse Osmosis Treatment Service

Generally used for short-term or emergency water needs, mobile water treatment services from Evoqua Water Technologies provide a convenient source of water to match customer site and raw water conditions.

Building Water Confidence With UV Disinfection (Video)

Building Water Confidence With UV Disinfection (Video)

TrojanUV is dedicated to providing the world with more efficient, environmentally-friendly water treatment solutions. This video shows how we’re helping municipalities deliver water confidence to their communities.

The YSI Pro2030 Handheld Conductivity And DO Meter Video

The YSI Pro2030 Handheld Conductivity And DO Meter Video

The YSI Pro2030 DO/conductivity water quality meter is ideal for any field application. The instrument is rugged and extremely simple to use.

More From Drinking Water Treatment Videos


Drinking Water Treatment involves the removal of pathogens and other contaminants from source water in order to make it safe for humans to consume. Treatment of public drinking water is mandated by the Environmental Protection Agency (EPA) in the U.S. Common examples of contaminants that need to be treated and removed from water before it is considered potable are microorganisms, disinfectants, disinfection byproducts, inorganic chemicals, organic chemicals and radionuclides.

There are a variety of technologies and processes that can be used to decontaminate or treat water in a drinking water treatment plant before the clean water is pumped into the water distribution system for consumption.

The first stage in treating drinking water is often called pretreatment and involves screens to remove large debris and objects from the water supply. Aeration can also be used in the pretreatment phase. By mixing air and water, unwanted gases and minerals are removed and the water improves in color, taste and odor.

The second stage in the drinking water treatment process involves coagulation and flocculation. A coagulating agent is added to the water which causes suspended particles to stick together into clumps of material called floc. In sedimentation basins, the heavier floc separates from the water supply and sinks to form sludge, allowing the less turbid water to continue through the process.

During the filtration stage, smaller particles not removed by flocculation are removed from the treated water by running the water through a series of filters. Filter media can include sand, granulated carbon or manufactured membranes. Filtration using reverse osmosis membranes is a critical component of removing salt particles where desalination is being used to treat brackish water or seawater into drinking water.

Following filtration, the water is disinfected to kill or disable any microbes or viruses that could make the consumer sick. The most traditional disinfection method for treating drinking water uses chlorine or chloramines. However, new drinking water disinfection methods are constantly coming to market. Two disinfection methods that have been gaining traction use ozone and ultra-violet (UV) light to disinfect the water supply.