Applying trait-function relationships for microbial plant decomposition to predict medium longevity in pollution...

Area of Science:

• Environmental Engineering
• Biotechnology
• Agricultural Science

Background:

• Biofilters are crucial for controlling odorous and hazardous emissions.
• Uncertainty in biofilter medium longevity and costs hinders widespread adoption.
• Improved medium-life estimations are needed for end-users.

Purpose of the Study:

• To compare decay rates of different biofilter media.
• To assess the impact of nitrogen enrichment and livestock emissions on medium decay.
• To provide quantitative data for optimizing biofilter medium selection.

Main Methods:

• Litter bags were used to monitor decay rates over 27 months in a full-scale biofilter.
• Common biofilter media types, including by-product and hardwood/softwood, were analyzed.
• The influence of nitrogen (N) amendments and barn emissions on decay was investigated.

Main Results:

• By-product media (mulch, corn cobs) exhibited faster decay than hardwood media; softwood media showed the slowest decay.
• Nutrient content was the primary predictor of early-stage decay.
• Carbon fractions and nutrient content were key predictors of overall medium longevity.
• Nitrogen amendments and N-rich barn emissions accelerated medium decay.

Conclusions:

• Decay rates and predictors for biofilter media are identifiable.
• This research offers biofilter engineers and farmers a quantitative method for medium selection.
• Optimized medium selection balances cost against replacement frequency for effective pollution control.