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  • Pharmaceutical-isolator
    Pharmaceutical Isolator From Franz Ziel

    Personal protection pharmaceutical isolators enables personal protection for operators when handling toxic substances.

  • JFW - 100W Attenuator
    100W Fixed Attenuator Covering DC - 8.4GHz

    Model 50HFFE-xxx-100/8 is a 50 Ohm coaxial fixed attenuator rated at 100 Watts average input power and operates DC-8.4 GHz. This model is available with N or SMA connectors.

  • DecFill SB
    Small Batch Aseptic Filling Systems For Powders And Liquids

    If you are looking for filling systems for different products such as liquids, powder, or flow-resistant highly viscous materials, Dec provides a modular concept allowing to meet a variety of packaging that is appropriate in the field of research and development as well as clinical trials. Speed up your go-to-market strategy with innovation and modular thinking.

  • 44V Motor Control & Drive SoC: PAC52400
    44V Motor Control & Drive SoC: PAC52400

    The PAC52400 is a low-cost, highly integrated SoC designed for motor control and general-purpose applications. It features a 32-bit microcontroller offering a compact and versatile solution for various applications.

  • GettyImages-966826582 data, research, analytics
    Technology Excellence Centers

    Comprehensive analytical and device testing services are available for injectable drugs, ensuring optimal primary packaging, compliance, and reliability throughout the product development lifecycle.

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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.