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  • power-generation
    Tesco Power Solutions

    Tesco Controls has been engineering, manufacturing, and integrating low-voltage (600V and below) power distribution equipment for the water / wastewater industries for over 40 years. TESCO is a UL-approved Original Equipment Manufacturer (OEM) of low-voltage (600V and below) electrical switchboards that include both indoor and outdoor applications.

  • Exodus - AMP4037-2 SUITE
    18 - 40 GHz, 10W Min Solid State High Power Amplifier: AMP4037-2 Suite

    The AMP4037-2 Suite solid-state, high-power amplifier operates in two high-frequency bands, Band A spanning 18 to 26.5 GHz and Band B covering 26.5 to 40.0 GHz, delivering exceptional performance across a wide frequency range.

  • 375_250-vsx3716_pic_clip_3sm
    High Power Solid State Power Amplifier: VSX3716

    The VSX3716 is a conduction cooled 1.5 kW X-band solid state power amplifier optimized for pulse radars. X-band solid state power transmitters are efficient, high power, and compact with proven GaN transistor technology.

  • Mol Device spectromax
    SpectraMax M Series Microplate Readers

    Configurable readers with triple-mode cuvette ports, validation tools, and compliance software.

    The SpectraMax® M Series Multi-Mode Microplate Readers measure UV and visible absorbance, fluorescence, luminescence, fluorescence polarization, TRF and HTRF.

  • PT-0067CH
    RESISTIVE DC - 67 GHz PICK-OFF TEE: PT-0067CH

    The PT-0067CH is a compact, broadband pick-off tee designed to provide non-directional microwave signal coupling from DC to 67 GHz.

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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.