WASTEWATER TREATMENT
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Water filtration technology has advanced to the point where wastewater can be rendered safe for drinking, according to a new report, but legislative and psychological hurdles will need to be overcome before widespread adoption can happen. "Expanding water reuse could significantly increase the nation's water resource, particularly in coastal communities," said Rhodes Trussell, president of Trussell Technologies in Pasadena, California, and chair of the committee that wrote the report. Treated wastewater, also known as reclaimed water, is commonly used for irrigation and industry. And many towns already rely on reused water simply because they draw water downstream from other municipalities’ wastewater release pipes.
Reclaimed Wastewater for Drinking: Safe but Still a Tough Sell
ASCE’s Failure to Act economic report series shows the economic consequences of continued underinvestment in our nation’s infrastructure, and the economic gains that could be made by 2020 in terms of GDP, personal disposable income, exports, and jobs if we choose as a country to invest in our communities. The culminating report was released on January 15, 2013 and presents an overall picture of the economic opportunity associated with infrastructure investment and the cost of failing to fill the investment gap. ASCE finds that with an additional investment of $157 billion a year between now and 2020, the U.S. can eliminate this drag on economic growth and protect: $3.1 trillion in GDP, almost the equivalent of Germany’s entire GDP $1.1 trillion in U.S. trade value, equivalent to Mexico’s GDP 3.5 million jobs, more than the jobs created in the U.S. over the previous 22 months $2.4 trillion in consumer spending, comparable to Brazil’s GDP $3,100 in annual personal disposable income
Failure to Act
Methods of Liquid Waste Treatment
A high BOD indicates the prescence of excess amounts of organic carbon. Oxygen depletion is a consequence of adding wastes with high BOD values to aquatic ecosystems. The higher the BOD of a source of wastes the higher the polluting power of that waste.
Why Cleaned Wastewater Stays Dirty In Our Minds
A boom sweeps around a tank at a sewage treatment plant in Coos Bay, Ore. Even though sewage water can be treated and cleaned, psychologists say getting the "cognitive sewage" out of the water is much more difficult. Jeff Barnard / AP Brent Haddad studies water in a place where water is often in short supply: California.
Reclaimed water
Reclaimed water or recycled water , is former wastewater (sewage) that is treated to remove solids and certain impurities, and used in sustainable landscaping irrigation or to recharge groundwater aquifers . The purpose of these processes is sustainability and water conservation , rather than discharging the treated water to surface waters such as rivers and oceans. The definition of reclaimed water, as defined by Levine and Asano, is "The end product of wastewater reclamation that meets water quality requirements for biodegradable materials, suspended matter and pathogens." [ 1 ] In more recent conventional use, the term refers to water that is not treated as highly in order to offer a way to conserve drinking water. This water is given to uses such as agriculture and sundry industry uses. Cycled repeatedly through the planetary hydrosphere , all water on Earth is recycled water.How does wastewater treatment work? Wastewater treatment can encompass a number of steps, which filter, clarify and clean wastewater from start to finish. Currently, the CRD region employs a variety of wastewater treatments, some of which filter and some of which provide secondary treatment.
How Wastewater Treatment Works
Chain & Scraper: Los Angeles Hyperion Wastewater Treatment Plant The City of Los Angeles’ Hyperion Wastewater Treatment Plant is one of the largest in the United States. It serves approximately 9 million people by treating 460 mgd of wastewater. Built in 1949, the plant was designed to treat up to 450 mgd but was forced to reduce secondary treatment in the 1960’s to 120 mgd due to limited secondary capacity. The city faced numerous challenges. With a governmental directive to cease ocean discharge of sludge by 1987 and provide secondary treatment to all wastewater by 1998, the city turned to Siemens to make the necessary changes.
Primary Wastewater Treatment
Sewage treatment
The objective of sewage treatment is to produce a disposable effluent without causing harm to the surrounding environment, and prevent pollution . [ 1 ] Sewage treatment is the process of removing contaminants from wastewater and household sewage , both runoff ( effluents ), domestic, commercial and institutional. It includes physical, chemical, and biological processes to remove physical, chemical and biological contaminants. Its objective is to produce an environmentally safe fluid waste stream (or treated effluent ) and a solid waste (or treated sludge ) suitable for disposal or reuse (usually as farm fertilizer ). Using advanced technology it is now possible to re-use sewage effluent for drinking water, although Singapore is the only country to implement such technology on a production scale in its production of NEWater . [ 2 ] [ edit ] Origins of sewage