QM Environmental International B.V.

Wastewater treatment solutions for anaerobic sludge digestion sector - Water and Wastewater - Sludge Management

Anaerobic digestion is a series of processes in which microorganisms break down biodegradable material in the absence of oxygen, used for industrial or domestic purposes to manage waste and/or to release energy. It is widely used as part of the process to treat wastewater, like Upflow Anaerobic Sludge Blanket (UASB) reactors. As part of an integrated waste management system, anaerobic digestion reduces the emission of landfill gas into the atmosphere. Anaerobic digestion is widely used as a renewable energy source because the process produces a methane and carbon dioxide rich biogas suitable for energy production, helping to replace fossil fuels. The nutrient-rich digestate which is also produced can be used as fertilizer. The digestion process begins with bacterial hydrolysis of the input materials in order to break down insoluble organic polymers such as carbohydrates and make them available for other bacteria. Acidogenic bacteria then convert the sugars and amino acids into carbon dioxide, hydrogen, ammonia, and organic acids. Acetogenic bacteria then convert these resulting organic acids into acetic acid, along with additional ammonia, hydrogen, and carbon dioxide. Finally, methanogens convert these products to methane and carbon dioxide.

Nevertheless, anaerobic sludge digesters from time to time suffer from a series of operating problems including:

  • Sour digestion syndrome – caused by acid build-up with simultaneous slowing or cessation of gas production.
  • Grease blankets – caused by the build-up of insolubles on the surface of the digester.
  • Nutrient imbalance – caused by the lack of certain key micronutrients. This slows the sludge stabilization process.

QM Environmental Services offers 2 products that can help solve and prevent these problems. Furthermore our products have demonstrated the enhancement of the digestion process resulting in higher biogas yields.


Nutrient Blend for Anaerobic Digesters: Enhances anaerobic digester performance. Improves grease digestion and gas production.


Bioblend for anaerobic wastewater treatment systems: Specialty blend of micronutrients, microbes, microbial growth enhancers and neutralizing agents for use in stimulating (and re-establishing, if necessary) biological activity in anaerobic wastewater systems, in general, and upflow anaerobic sludge blanket (UASB) reactors, in particular.


A natural product which when used results in an improved ecosystem of sludge digesters. The micro organisms present in the digester, which are responsible for the transformation of the organic matter and retreive there energy from this process, can work optimal with the use of BioStym. This results in an improved methanogenic phase of the digestion process which results in higher biogas yields. Scientific research has demonstrated that, regardless of the size of the digester, an increase of biogas production from 5 to 25% can be achieved.