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An innovative nutritional slow-release packing material with functional microorganisms for biofiltration:
Zhuowei Cheng1, Ke Feng1, Danhua Xu1
1College of Environment, Zhejiang University of Technology, Hangzhou, 310009, China.
Journal of Hazardous Materials
|December 1, 2018
Summary
A novel nutritional slow-release packing material with functional microorganisms (NSRP-FM) effectively removes n-butyl acetate in biofilters. This innovative material supports microbial growth and maintains high removal efficiency without nutrient addition or pH control.
Area of Science:
- Environmental Science
- Biotechnology
- Chemical Engineering
Background:
- Packing material is crucial for biofiltration efficiency in pollutant removal.
- Gaseous n-butyl acetate poses environmental challenges.
- Optimizing microbial growth and nutrient availability is key for biofilter performance.
Purpose of the Study:
- To evaluate the feasibility of a nutritional slow-release packing material with functional microorganisms (NSRP-FM) for n-butyl acetate removal.
- To compare the performance of NSRP-FM with commercial polyurethane foam (PU-foam) in biotrickling filters (BTFs).
- To assess the impact of NSRP-FM on microbial growth and pollutant removal under varying conditions.
Main Methods:
- An innovative NSRP-FM was synthesized using emulsification-cross linking and microbial immobilization.
- Characterization of NSRP-FM included specific surface area, bulk density, and nutrient release rates.
- Comparative performance evaluation of NSRP-FM and PU-foam in identical BTFs for n-butyl acetate removal.
- Energy dispersive X-ray spectroscopy (EDS) was used to analyze inorganic element release.
Main Results:
- NSRP-FM exhibited a specific surface area of 2.45 m² g⁻¹ and bulk density of 40.75 kg m⁻³.
- Cumulative release rates of total phosphorus and nitrogen from NSRP-FM were 90.6% and 75.6%, respectively.
- The BTF with NSRP-FM achieved over 95% removal efficiency without nutrient addition or pH adjustment.
- The BTF with PU-foam showed significantly lower removal efficiency (declining to 65% without pH adjustment).
- EDS analysis confirmed inorganic element release from NSRP-FM, supporting microbial activity.
Conclusions:
- NSRP-FM is a feasible and effective packing material for gaseous n-butyl acetate removal in biofilters.
- The NSRP-FM provides a superior environment for functional microorganism growth compared to PU-foam.
- This material offers a stable and efficient biofiltration solution, reducing the need for external nutrient supplements and pH control.
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