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  • GettyImages-166539104-cell-petri-gloves-lab-research
    Custom Media To Optimize Your Project

    Many cell types require highly-specialized formulations in order to achieve optimal performance. Build a media from scratch that meets your specific requirements, regardless of the complexity.

  • AR - 30S1G6C
    Broadband Power Amplifier: 30S1G6C

    The Model 30S1G6C is a solid-state, Class A design, self-contained, aircooled, broadband power amplifier designed for applications where instantaneous bandwidth, high gain and linearity are required.

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    Medical Information

    25 years of Providing World-Class Medical Information Services.

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    Viral Vector (AAV, LVV, AdV, And RVV) Solutions

    A robust, reliable manufacturing partner offers solutions spanning the entire development timeline. Charles River can help deliver your virus program with speed and reduced costs.

  • Pester Bundler, Model PEWO-Fold 1
    Used Pester Bundler Equipment

    Used Pester bundler, model PEWO-Fold1, serial# 10183, built 2000.

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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.