In-Vessel Compost Cover Specifics

In-Vessel Compost Cover Specifics

 

US Composting Council - http://www.compostingcouncil.org

Biocycle Magazine – http://www.biocycle.net

The ODOUR STOP™ in-vessel aerated static pile (IASP) system is a proven composting technology capable of meeting pathogen reduction requirements, while providing significant odor and VOC reduction. One of the keys to the ODOUR STOP™ system is its ability to maintain optimum temperature during active composting through controlled aeration. The active compost phase with the ODOUR STOP™ IASP system requires approximately four weeks. During this period the compost piles remain covered and no additional handling or mixing is required. At the end of the initial four weeks of composting, the piles are uncovered and the material is moved to the curing area. New windrows are then created and the piles are covered for an additional two weeks in order to further stabilize the compost. Further curing of the product (uncovered) may be required to meet individual product quality specifications. To efficiently manage the temperature within the compost piles the ODOUR STOP™ system uses an automated aeration control system to match temperature and oxygen levels to the respiration requirements of the compost microorganisms. Aeration is controlled based on pile temperatures and oxygen levels inside within the pile. In general, the pile temperatures should not exceed 165 F and the oxygen content of the piles should not be less than 10%. The temperature and oxygen level in the piles can be controlled by the integrated computer software. The computer controlled aeration system generally operates as follows: Aeration blower control system operates automatically to turn on blowers in each compost pile based on temperature and O2 levels in the pile. Aeration system blowers are controlled by a computer and on/off cycles are infinitely adjustable to provide aeration to each compost pile around the clock. Large compost piles could have as many as three combinations temperature/O2 probes. Data from each probe is collect and averaged by the computer to effect any change in blower operational status, i.e., on/off. The high set point for temperature is generally 165 F. If the average temperature in the pile exceeds the set point temperature the blower will be turned off. The low set point for O2 is 10% oxygen concentration. If the average O2 concentration drops below 10% the blower would be turned on. Set points are adjustable through the computer terminal. The computer tracks and plots the time/temperature/O2 data for each active pile. The system can use radio telemetry (wireless) probes so that no cabling between the field probe and computer is required.