NUTRIENT REMOVAL CASE STUDIES & WHITE PAPERS

Plant Boasts The First In-Line Fermenter In The Country

Several years ago, the Environmental Protection Agency (EPA) began an initiative in the Mississippi River basin to control excess amounts of nitrogen and phosphorus pollution entering the Gulf of Mexico through watersheds and point sources such as municipal wastewater treatment plants.

Howard County, Maryland Sets The Pace In Restoring Chesapeake Bay Ecosystem

Howard County, Maryland, Bureau of Utilities recently completed the $92-million Addition No. 7 project at the Little Patuxent Water Reclamation Plant (LPWRP) to improve the quality of the plant’s effluent discharge and to reduce harmful nutrients reaching Chesapeake Bay. The project’s various increments took over five years to complete and incorporated innovative design solutions and state-of-the-art technologies for denitrification, aeration and disinfection. The project presents a model for Maryland’s 66 largest wastewater treatment plants and possibly procurement of municipal facilities elsewhere facing increasingly stringent regulatory changes.

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NUTRIENT REMOVAL PRODUCTS

DAVCO™ Field-Erected Treatment Plants

DAVCO™ Field-Erected Treatment Plants

Evoqua Water Technologies manufactures and supplies DAVCO™ steel field erected biological treatment systems for the reduction of biochemical oxygen demand (BOD), total suspended solids (TSS), total nitrogen (TKN) and phosphorus (P). If municipal or industrial wasteater treatment facilities are looking for ways to reduce their associated engineering and construction costs, plus have a shorter concept-to-completion timeline, then these systems are the ideal choice.

The VLR® System for TrueSND™ Biological Treatment

The VLR® System for TrueSND™ Biological Treatment

VLR® Systems from Evoqua utilize a vertical loop based design with looped reactors in series that allows DO stratification. As such, it is suited for simultaneous nitrification/denitrification; biological phosphorus removal and storm water treatment..

The BioMag® System for Enhanced Secondary Treatment

The BioMag® System for Enhanced Secondary Treatment

Proven to dramatically increase biological treatment capacity and help meet ENR limits.

The CoMag® System for Enhanced Clarification

The CoMag® System for Enhanced Clarification

Proven to dramatically increase capacity performance and help to meet tightening regulations.

Wastewater Equipment Retrofit, Rehab and Aftermarket Solutions

Wastewater Equipment Retrofit, Rehab and Aftermarket Solutions

When demand increases, regulations change, and components reach their useful life, Evoqua Water Technologies responds.

Brands You Know. Performance You Trust

Brands You Know. Performance You Trust

While the Evoqua name is new, the brands you know and the performance you trust are not. Evoqua continues a 100-year tradition of helping consulting engineers and municipalities respond to market needs and evolving water standards for new plants, upgrades and retrofits.

RJ Environmental and Davis Odor Control Solutions

RJ Environmental and Davis Odor Control Solutions

In the modern world of wastewater treatment, control of odors has moved from an afterthought to a primary design consideration for most collection and treatment facilities. As communities and other development increases in the areas surrounding these facilities, the need for odor control systems becomes more important.

Envirex® Biological Treatment and Clarification

Envirex® Biological Treatment and Clarification

Evoqua's biological treatment and clarification business is rooted in the first chain systems applied to a wastewater plant. A REX® system from the Chain Belt Company, a precursor to Envirex®, was installed in 1910 and operated for almost seventy years with the support of our experts and aftermarket services. Envirex branded wastewater technologies from Evoqua has continued to be an innovative leader for equipment designs and services for aeration, biological treatment, anaerobic treatment, clarification, digestion, and separation treatment equipment for municipal and industrial applications.

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NUTRIENT REMOVAL PODCASTS

Nutrient Removal In Cold Temperatures

Nutrient Removal In Cold Temperatures

Cold temperatures add another layer of challenges to nutrient removal. In this Water Online Radio interview, Martin Hildebrand, the president of Nelson Environmental, talks about the cold temperature applications in Canada and how new technology can help.

From Burden To Blessing:  The Value of Resource Recovery

From Burden To Blessing: The Value of Resource Recovery

The name “wastewater” doesn’t accurately describe water that has been used, says Jim Porteous, from Ovivo. 

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NUTRIENT REMOVAL VIDEOS

Severn Trent Services Expands Capabilities For Disinfection, Nutrient Removal, And Filtration

Severn Trent Services Expands Capabilities For Disinfection, Nutrient Removal, And Filtration

Water Online’s Ron Grunsby interviews John Dyson of Severn Trent Services to uncover the latest innovations and developments from the company, including the product line on display at WEFTEC 2012.

Superior Effluent Quality With Batch Reactor Technology

Superior Effluent Quality With Batch Reactor Technology

Changing effluent demands are a common challenge for wastewater treatment plant operators. The AquaSBR sequencing batch reactor provides an adaptive solution, delivering enhanced biological nutrient removal (EBNR) with flexible design and process control. Watch this video to see a 3D animation of the system’s five-phase operation.

Science Safeguards Drinking Water From Harmful Algal Blooms

Toxins from harmful algal blooms are increasingly contaminating source waters, as well as the drinking water treatment facilities that source waters supply. EPA researchers are helping the treatment facilities find safe, cost effective ways to remove the toxins and keep your drinking water safe.

Biological Denitrification Evolves

Biological Denitrification Evolves

As regulation regarding nutrients evolves, so does the technology to remove them.

Monitoring Nutrient Loading Via Satellite

Monitoring Nutrient Loading Via Satellite

Blue Water Satellite uses satellite technology to monitor nutrient loading on land and in water bodies. Blue Water Satellite can compare current and past data to give a far greater picture of land and water body health than previously thought possible.

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NUTRIENT REMOVAL NEWS

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ABOUT NUTRIENT REMOVAL

 

About Nutrient Removal

Nutrient removal from wastewater consists of treating wastewater to remove nitrogen and phosphorus before it reenters natural waterways. High levels of nitrogen and phosphorus in wastewater cause eutrophication, a process where excess nutrients stimulate excessive plant growth such as algal blooms and cyanobacteria. The decomposition of the algae by bacteria uses up the oxygen in the water causing other organisms to die. This creates more organic matter for the bacteria to decompose. In addition, some algal blooms can produce toxins that contaminate drinking water supplies.

As authorized by the Clean Water Act, the National Pollutant Discharge Elimination System (NPDES) permit program regulates point sources, such as municipal wastewater treatment plants, that discharge pollutants as effluent into the waters of the United States. In recent years, many of the States’ environmental bodies have lowered nutrient limits to arrest eutrophication. Maryland’s effort to protect the Chesapeake Bay and its tidal tributaries is perhaps the most notable example of nutrient removal in the US. Nutrient removal continues to be a growing area of focus for wastewater treatment throughout the world.   

The removal of nitrogen and phosphorus require different nutrient removal processes. To remove nitrogen, the nitrogen is oxidized from ammonia to become nitrate through a process called nitrification. This process is then followed by denitrification where the nitrate is reduced to nitrogen gas which is released to the atmosphere and removed from the wastewater.

Nitrification is a two-step aerobic process which typically takes place in aeration tanks. Denitrification requires anoxic conditions to encourage the appropriate biological conditions to form. The activated sludge process is often used to reduce nitrate to nitrogen gas in anoxic or denitrification tanks.

Phosphorus can be removed biologically using polyphosphate accumulating organisms (PAOs) which accumulate large quantities of phosphorus within their cells and separate it from treated water. Phosphorus removal can also be achieved by chemical removal. Once removed as sludge, phosphorus may be stored in a land fill. However, many municipalities and treatment facilities are looking to resell the biosolids for use in fertilizer.