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

Combining Energy Efficiency and Nutrient Removal

Combining Energy Efficiency and Nutrient Removal

The Sanitaire Bioloop oxidation ditch process effectively removes total nitrogen and total phosphorus. Our experienced design team can put together an optimized, flexible solution suited to your current and future treatment needs—without the “black box” approach. Best of all, the process comes standard with all the long-term support you’ve come to expect from Sanitaire and can be provided with a process performance guarantee.

Video: Integrated Fixed-Film Activated Sludge (IFAS) From Headworks BIO

Video: Integrated Fixed-Film Activated Sludge (IFAS) From Headworks BIO

The Integrated Fixed-Film Activated Sludge (IFAS) process is typically installed as a retrofit solution for conventional activated sludge systems that are at or beyond capacity.

Subcommittee Hearing: Cyanotoxins In Drinking Water

On Wednesday, November 19, 2014, at 10:15 a.m. in 2322 Rayburn House Office Building, the Subcommittee on Environment and the Economy will hold a hearing entitled “Cyanotoxins in Drinking Water."

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.

WEDECO PRO<sub>3</sub>MIX Overview

WEDECO PRO3MIX Overview

The PRO3MIX bromate control system is an intelligent ozone-based advanced oxidation process (AOP) introduction and reaction system enabling ozone treatment in a compact and intelligent design to mitigate bromate formation even in cases of high level bromide in source water. This short animated overview walks the reader through the various disinfection points of the process.

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NUTRIENT REMOVAL NEWS

More From Nutrient Removal News

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.