NUTRIENT REMOVAL CASE STUDIES & WHITE PAPERS

Sustainable Nutrient Removal With IFAS

With the AnoxKaldnes Hybas IFAS system, the City of Cocoa Beach, FL, met the challenges of tighter nutrient regulations, site constraints, and operating conditions. And the project met the city’s goals to meet these challenges with a simultaneous decrease in energy use. On top of that, the city did not need to increase operations time or staffing to meet these goals. With the AnoxKaldnes Hybas IFAS system, the city is now meeting stricter nutrient regulations – and doing it sustainably.

  • VLR® System For Biological Treatment Case Study
    VLR® System For Biological Treatment Case Study

    Economic development has its price and sometimes calls for major upgrades to a community’s wastewater treatment facilities.

  • New And Innovative Rare Earth Technology For Low-Level Phosphorus Removal
    New And Innovative Rare Earth Technology For Low-Level Phosphorus Removal

    With environmental regulations continuing to restrict the discharge of phosphorus from wastewater treatment facilities, traditional methods of phosphorus removal are proving inadequate.

  • Wastewater Plant Taking Proactive Measures To Protect Natural Resources
    Wastewater Plant Taking Proactive Measures To Protect Natural Resources

    The Prince William County Service Authority carefully considers its impact to the environment when conducting wastewater treatment.

  • Retrofit Helps WWTP Meet New Total Nitrogen Limit
    Retrofit Helps WWTP Meet New Total Nitrogen Limit

    The City of East Providence WWTP was asked by RIDEM to upgrade its facilities to increase treatment capacity and also meet a new more stringent Total Nitrogen limit.

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

  • Solving A Taste and Odor Problem Step By Step (Article)
    Solving A Taste and Odor Problem Step By Step (Article)

    The City of Alliance Ohio’s water system has experienced annual Taste and Odor (T&O) events since the mid 1950’s, when the first of two reservoirs, Deer Creek Reservoir, was placed into service. Nutrient contaminants, in particular phosphorous, in the watershed accumulate in the reservoirs causing algal blooms. By Terry Keep of TrojanUV, Said Abou Abdallah of Arcadis, and Dr. Dean Reynolds, Department of Water Treatment City of Alliance, Ohio

  • How Can Seasonal Establishments Treat Their Wastewater Economically?
    How Can Seasonal Establishments Treat Their Wastewater Economically?

    Opened a few months per year, seasonal establishments typically experience important fluctuations in the number of visitors. Energy consumption and operating expenses must continually be analysed and optimized. The implementation of efficient energy management practices and the integration of innovative wastewater treatment solutions that can improve their cost-efficiency ratio have become major sources of savings for this whole industry.

  • Meeting State Nutrient Regulations With SBRs
    Meeting State Nutrient Regulations With SBRs

    After the Missouri Department of Natural Resources reclassified the effluent receiving stream in the city of Sullivan, officials learned that its wastewater treatment lagoon required a more advanced treatment process to comply. They selected a continuous-flow sequencing batch reactor (SBR) system that utilizes a modified activated sludge biological treatment. The new infrastructure has provided cost-saving results for the ongoing removal of nitrogen and phosphorous.

  • Disc Aerators Replace Brush Aerators, Increasing Capacity And Performance
    Disc Aerators Replace Brush Aerators, Increasing Capacity And Performance

    To comply with new EPA rules and handle additional flow, the City of St. Charles Missouri WWTP required a capacity increase, and the landlocked plant needed a solution that would fit within its existing footprint. Brush aerators and boat clarifiers were replaced with 12 VLR-mounted disc aerators to fulfill the oxygen requirement while allowing for the treatment of higher organic loading. The solution provided increased nutrient-removal capacity and improved efficiency without increasing tank volume.

  • Top-Entry Agitators Keep Costs Low, Combat Pollution
    Top-Entry Agitators Keep Costs Low, Combat Pollution

    As the drainage basin to 85 million people, the Baltic Sea has faced considerable environmental strain for many years. Updated regulations to reduce levels of phosphorous and nitrogen prompted the Central Wastewater Treatment Plant in Saint Petersburg, Russia, to install new top-entry agitators in its aeration basins. By optimizing thrust and bulk flow, the updated plant now combats pollution by treating 400 MGD of wastewater while keeping energy costs to a minimum.

Continuous Fill SBR Tanks Help WWTP Exceed Effluent Requirements, Generate Additional Revenue

In order to meet the anticipated effluent criteria required by the Pennsylvania DEP, the Newville Borough Water & Sewer Authority determined that its existing wastewater treatment facility needed renovations. By installing two continuous fill SBR tanks, the facility lowered total nitrogen below permit limits, reduced energy costs, and created a new revenue stream (selling unused nutrient allocations). Read the case study for full details.

More Case Studies & White Papers

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.

VLR® System For Biological Treatment

VLR® System For 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.

Odor Control Solutions

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. 

More Nutrient Removal Podcasts
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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.

Biological Denitrification Evolves

Biological Denitrification Evolves

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

On-Line Probes For Analyzing Nutrient Removal From Wastewater

On-Line Probes For Analyzing Nutrient Removal From Wastewater

WEFTEC 2009 - Bob Dabkowski of Hach discusses a variety of the Company's instruments and on-line probes for analyzing nutrient removal from wastewater.

Chemical-Free Pretreatment Technology

Chemical-Free Pretreatment Technology

This video demonstrates the advantages of using OpenCEL technology for the pretreatment of secondary waste-activated sludge generated during advanced biological wastewater treatment. OpenCEL employs high frequency electrical pulses to break open biomass cell membranes, releasing soluble material that is more readily digested. Learn how the chemical-free technology can cut costs and recover energy.

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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.