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.
DRINKING WATER CASE STUDIES AND WHITE PAPERS
Stinkin' Drinkin' Water No More: Oxidation/Filtration Removes Hydrogen Sulfide
In January 2010, AdEdge Water Technologies, LLC was contacted by Aqua Utilities Florida to provide a hydrogen sulfide removal system for the Lake Josephine Community located in Highlands County, Florida.
Biothane Delivers Anaerobic Wastewater Treatment To Veryfine Products Biothane’s turnkey project was designed to treat wastewater by providing a series of treatment processes. Pre-treatment consists of a bar screen, influent sump, grit removal and rotary screen to remove debris from the influent stream. By Veolia Water Solutions & Technologies
White Paper: High-Efficiency Reverse Osmosis Treats Gray Water For Power Generation
Recycling of gray wastewater as boiler make- up water was the challenge where silica value was typically 85 ppm in this secondary treated wastewater. This paper describes a new design called the High-Efficiency Reverse Osmosis selected for that task, discusses the project technical considerations and highlights the actual performance of the system.
Article: Validation Of Online Monitors Using EPA 334.0 And EPA-Approved Or Accepted Laboratory Meter Reporting Methods There has long been verification testing between lab and online instrumentation for water quality measurements, especially for Drinking Water and Wastewater (DW//WW). By Jane L. Stevens, Product Manager, Thermo Fisher Scientific
In California, Come Rain Or Shine, Upfront Efficiency Is Always In Style
Caught between a withering drought and floods from winter storms, California faces the worst of both worlds—dealing with scarcity as well as stormwater. America, and much of the world, is watching to see how this trendsetting state handles those challenges. After generations of setting America’s style, from cowboys to Beatniks to Beach Boys to Silicon Valley billionaires, California can set perhaps its most important trend yet—it can lead the way to a more water-efficient America. It has to. The good news is that it can. By Jim Lauria, Senior Vice Director-Water Treatment, Bilfinger Water Technologies
Extreme Water Filtering – Consider High-Flow Systems To Save Costs And Reduce Waste
In an era when everything is done to the extreme – from sports, to home makeovers, to weather predictions – it should come as no surprise that the world of water filtering has joined the crowd. “Extreme” filtering, so to speak, is achieved through the use of high-flow cartridge systems – smaller designs that are able to handle much higher water volumes and pressures at lower costs and with less maintenance. By Robert LeConche, President, Shelco Filters
Aquatech Treats A Tertiary Effluent Wastewater Project In India To bridge the gap between demand and supply and to have reliable power supply to the capital city of Delhi, a 330 MW combined cycle Gas Turbine Power Project - Pragati Power Project (PPP) – was set up on a fast track basis. By Aquatech International Corporation
Case Study: Aquatech Supplies 40,000 m3/day SWRO In Saudi Arabia Saudi Arabia General Authority of Civil Aviation (GACA) is responsible for constructing, managing, operating, and maintaining airports and air navigation infrastructure in Saudi Arabia. By Aquatech International Corporation
Understanding ISE Measurements In Wastewater Process Monitoring
Analytic measuring technique provides a huge number of procedures to determine the concentrations of substances in an unknown sample, e.g. photometry, titration or mass spectrometry.
Case Study: Chemplast Chooses Aquatech’s HERO™ & ZLD The Chemplast Mettur plant uses the Cauvery River as their main fresh water source. A strong industrial growth in recent years has resulted in water scarcity in the region. Industries are also required to follow strict environmental norms for discharging effluents. The intent of a Waste Water Treatment Plant was to have complete treatment, recycle and reuse of the combined waste water streams to reduce intake from the Cauvery River while not discharging any liquid waste streams. By Aquatech International Corporation
DRINKING WATER APPLICATION NOTES
Application Note: Troubleshooting A pH Electrode
Many factors affect performance of a pH electrode. When performance degrades, it is always a challenge for the analyst to identify the cause. Common troubleshooting procedures, which include evaluation of slope, electrode drift, time response, and accuracy, take considerable time. By Thermo Fisher Scientific
Application Note: Employing Best Water Quality Monitoring Practices To Reduce Runoff During Construction Under proposed EPA stormwater runoff guidelines, construction site operators will be required to actively monitor or sample stormwater discharges daily. The enhanced effluent rules take effect in August 2011 for construction sites that disturb 20 or more acres and February 2014 for sites that disturb 10 or more acres, and they may stipulate a strict numerical limit of less than 280 NTU for average turbidity (sediment in water) on any day. By YSI
Application Note: Simultaneous Determination Of Total Bound Nitrogen (TNb) And Total Organic Carbon (TOC) In Aqueous Samples Total bound nitrogen (TNb) consists of dissolved ammonia, nitrates, nitrites, amines, and other organic nitrogen-containing compounds. TNb measurements represent an alternative to Total Kjeldahl Nitrogen (TKN) analysis for rapid screening of industrial wastewater, drinking water,agricultural run-off, and surface waters. By OI Analytical
Chinese Chemical Plant Optimizes Water Treatment By Replacing Double Pass RO With A Single Pass RO And Liqui-Cel® Contactor System Electrodeionization (EDI) is widely used in many industrial water treatment systems throughout the world. In order to maximize the operating stability and life expectancy of an EDI system they were often designed with double pass RO using caustic injection pretreatment. By Membrana
Disinfection By-Products (DBP) Precursor Monitoring
Chlorine has long been used as a primary disinfection method for many water and wastewater treatment applications. However, there is growing concern about the harmful DBP’s produced by the use of chlorine.
Monitoring Chloramination Using The APA6000™ Ammonia/Monochloramine Analyzer
Chloramination, a process often used for disinfection of drinking water and wastewater, involves mixing chlorine and ammonia to form chloramines. The relative concentrations of both chlorine and ammonia are essential for optimum disinfection.
Ion Exchange Resins And Activated Carbons For Better-Tasting Water
For many, access to good-tasting tap water is limited, and buying bottled water can be expensive. Simple pour-through jug filters offer a low-cost and effective alternative. Activated carbons, in conjunction with ion exchange products, produce drinking water that is absent of all industrial pesticides and contaminants.
Application Note: Measurement Of TOC In Bottled Mineral Water And Raw Water By TOC-VCSH Water is used in large quantities to manufacture soft drinks, bottled mineral water, beer and other drinks. The quality of the raw water has a major influence on the quality of the manufactured products
A Strategy For Optimizing Water Treatment Plant Performance Using Light Scatter Technologies
Two new particle detecting technologies have been developed to help optimize filter performance at water treatment plants (WTP).
Chemical Cost Comparison Of A Conventional Deaerator Vs A Liqui-Cel® Membrane Contactor System Mixed bed ion exchange is often used to polish Reverse Osmosis (RO) permeate in many industrial water systems.This process has been utilized for several years and it is well known that the management of the dissolved Carbon Dioxide (CO2) in the water is critical for an efficient operation. By Membrana
DRINKING WATER PRODUCTSMore Products
LATEST INSIGHTS ON DRINKING WATER
Aging Infrastructure Creates Challenges For Utilities And Their Customers
It’s no great secret that a sound infrastructure plays a critical role in the health of our economy and our individual health. A first-class infrastructure — not just well-maintained, but modernized and innovative — is the hallmark of a first-class nation. In the United States, up until relatively recently, building the best roads, bridges, railroads and water supply systems was a priority for that very reason. The literal foundation of America was once among the strongest in the world. By Myles Meehan, Senior Vice President, Public Relations, HomeServe USA
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?
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
Stormwater: A Valuable Resource For Power Plants?
Stormwater is often thought of as a burden. Too much of it can overwhelm wastewater treatment facilities, flood communities, and lead to the pollution of lakes and rivers. There is debate on who’s in charge of it and how it should be managed. Several communities have invested millions, and some even billions, trying to control stormwater. Even chicken farmers have issues with stormwater.
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
Not all technology holds up during a weather emergency. Electricity often fails, communication methods are compromised, and computer networks go offline.
DRINKING WATER NEWS
DRINKING WATER VIDEOSMore Drinking Water Videos
ABOUT DRINKING WATER
In most developed countries, drinking water is regulated to ensure that it meets drinking water quality standards. In the U.S., the Environmental Protection Agency (EPA) administers these standards under the Safe Drinking Water Act (SDWA).
Drinking water considerations can be divided into three core areas of concern:
- Source water for a community’s drinking water supply
- Drinking water treatment of source water
- Distribution of treated drinking water to consumers
Drinking Water Sources
Source water access is imperative to human survival. Sources may include groundwater from aquifers, surface water from rivers and streams and seawater through a desalination process. Direct or indirect water reuse is also growing in popularity in communities with limited access to sources of traditional surface or groundwater.
Source water scarcity is a growing concern as populations grow and move to warmer, less aqueous climates; climatic changes take place and industrial and agricultural processes compete with the public’s need for water. The scarcity of water supply and water conservation are major focuses of the American Water Works Association.
Drinking Water Treatment
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 for contaminant removal and the removal of pathogens 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.
Drinking Water Distribution
Drinking water distribution involves the management of flow of the treated water to the consumer. By some estimates, up to 30% of treated water fails to reach the consumer. This water, often called non-revenue water, escapes from the distribution system through leaks in pipelines and joints, and in extreme cases through water main breaks.
A public water authority manages drinking water distribution through a network of pipes, pumps and valves and monitors that flow using flow, level and pressure measurement sensors and equipment.
Water meters and metering systems such as automatic meter reading (AMR) and advanced metering infrastructure (AMI) allows a water utility to assess a consumer’s water use and charge them for the correct amount of water they have consumed.