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Efficiency of biological activator formulated material (BAFM) for volatile organic compounds removal--preliminary batch culture tests with activated sludge.

Environmental technology (2012-09-20)
Charline Corre, Catherine Couriol, Abdeltif Amrane, Eric Dumont, Yves Andrès, Pierre Le Cloirec
ABSTRACT

During biological degradation, such as biofiltration of air loaded with volatile organic compounds, the pollutant is passed through a bed packed with a solid medium acting as a biofilm support. To improve microorganism nutritional equilibrium and hence to enhance the purification capacities, a Biological Activator Formulated Material (BAFM) was developed, which is a mixture of solid nutrients dissolving slowly in a liquid phase. This solid was previously validated on mineral pollutants: ammonia and hydrogen sulphide. To evaluate the efficiency of such a material for biodegradation of some organic compounds, a simple experiment using an activated sludge batch reactor was carried out. The pollutants (sodium benzoate, phenol, p-nitrophenol and 2-4-dichlorophenol) were in the concentration range 100 to 1200 mg L(-1). The positive impact of the formulated material was shown. The improvement of the degradation rates was in the range 10-30%. This was the consequence of the low dissolution of the nutrients incorporated during material formulation, followed by their consumption by the biomass, as shown for urea used as a nitrogen source. Owing to its twofold interest (mechanical resistance and nutritional supplementation), the Biological Activator Formulated Material seems to be a promising material. Its addition to organic or inorganic supports should be investigated to confirm its relevance for implementation in biofilters.

MATERIALS
Product Number
Brand
Product Description

Supelco
Sodium benzoate, Pharmaceutical Secondary Standard; Certified Reference Material
Sigma-Aldrich
Sodium benzoate, ReagentPlus®, 99%
Sigma-Aldrich
Sodium benzoate, purum p.a., ≥99.0% (NT)
Supelco
4-Nitrophenol solution, certified reference material, 5000 μg/mL in methanol
Sigma-Aldrich
4-Nitrophenol solution, 10 mM
Sigma-Aldrich
Sodium benzoate, BioXtra, ≥99.5%
Sigma-Aldrich
Sodium benzoate, puriss., meets analytical specification of Ph. Eur., BP, FCC, E211, 99.0-100.5% (calc. to the dried substance), powder
Sigma-Aldrich
4-Nitrophenol, spectrophotometric grade
Supelco
Acetaminophen Related Compound F, Pharmaceutical Secondary Standard; Certified Reference Material
Sigma-Aldrich
4-Nitrophenol, ReagentPlus®, ≥99%
Sigma-Aldrich
2,4-Dichlorophenol, 99%
Supelco
4-Nitrophenol
Supelco
4-Nitrophenol, PESTANAL®, analytical standard
Supelco
2,4-Dichlorophenol, PESTANAL®, analytical standard