- Continuous plug flow process
- Guaranteed Class A biosolids
- Utilizes existing facilities
- No chemicals, dust, off gas or odor
- Can increase digester capacity
Ashbrook® ECO-THERM™ technology is a continuous pasteurization process for the on-site production of exceptional quality, neutral pH, Class A biosolids. When comparing the options available for sludge disposal, the beneficial use associated with land application is much preferred over other options such as land filling or incineration. The current trend is toward both land application and the use of Class A biosolids, as Class A biosolids are ideal for usage as a soil amendment as these biosolids contain a relatively high total nitrogen and phosphorus nutrient content.
BENEFITS OF CLASS A BIOSOLIDS
The benefits of biosolids for both soil and vegetation are numerous and well recognized. Biosolids provide primary nutrients (nitrogen and phosphorous) and secondary nutrients such as calcium, iron, magnesium and zinc. Also, the use of biosolids increases crop yields and maintains nutrients in the root zone and unlike chemical fertilizers, biosolids provide nitrogen that is released slowly over the growing season as the nutrient is mineralized and made available for plant uptake. Land application of biosolids can also offer net greenhouse gas benefits by recycling carbon to the soil and fertilizing vegetation for further carbon dioxide capture.
With the higher level of pathogens (< 2,000,000 MPN/g TS) present in Class B biosolids, land application is highly restricted and not attractive to the public in general. Conversely, Class A biosolids substantially lower pathogen levels (< 1,000 MPN/g TS), enabling it to be used with few restrictions