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Biological Wastewater Treatment

Enhance Water Quality for All Wastewater Types with Advanced Biological Treatment Solutions

Biological wastewater treatment is an economical means of removing both organic and inorganic contaminants from wastewater. While it is commonly used for the treatment of domestic sanitary wastewater, it is also effective for industrial wastes.   

The Wastewater Treatment Process

The first step in a wastewater treatment process utilizes primary or mechanical systems to remove large suspended and floating solids from raw sewage. In the next step, called secondary or biological wastewater treatment, high concentrations of naturally occurring bacteria are confined in treatment tankage and combined with protozoa and other microbes to form activated sludge. The activated sludge bacteria break down organic molecules into inert substances creating effluent water suitable for discharge to rivers, lakes or streams. 

Types of Biological Treatment Systems 

  • Aerobic Process: Uses oxygen to promote the growth of microorganisms that break down organic contaminants 
    Examples: Activated sludge systems, oxidation ditches, rotating biological contactors, and SeHAWK® 

  • Anoxic Process: Operates in the absence of oxygen, using different microorganisms to treat contaminants 
    Examples: Anaerobic digestors and lagoons 

  • Anaerobic Process: Takes place in environments without oxygen, where specific microorganisms break down contaminants, often producing methane as a byproduct 
    Examples: Used in processes like denitrification 

  • Combination Process: Some systems use a mix or aerobic, anoxic, and anaerobic processes to achieve optimal treatment results 
    Examples: Activated sludge systems and sequencing batch reactors 

How We Can Help

As effluent water quality regulations become more stringent, the demand for high quality wastewater treatment solutions continues to grow along with methods for reducing energy consumption and expanding capacity in existing plant footprints. Xylem responds to evolving wastewater treatment standards with solutions that include biological oxygen demand (BOD) reduction, aeration, clarification, phosphorous and nitrogen removal. We also offer key innovations for simultaneous nitrification denitrification, magnetite ballasted treatment, and biological treatment for trace contaminants such as selenium and heavy metals. 

In addition, when plant treatment equipment reaches the end of its useful life, Xylem can help turn what you have into what you need, to increase performance, reduce maintenance and extend lifetime to keep treatment plants up and running.

 

Unlock the power of nature with advanced biological wastewater treatment—where innovative systems transform pollutants into pristine water while cutting energy costs and boosting efficiency