title: Novel bioconversion of wheat straw to bio-organic fertilizer in a solid-state bioreactor.
abstract: In order to increase the eco-efficiency and overall availability of naturally renewable resource, the novel bioconversion of steam-exploded wheat straw to bio-organic fertilizer containing N(2)-fixer, P and K solubilizers was investigated. The conversion was performed in solid-state fermentation (SSF) with periodic air-forced pressure oscillation (PAPO). The results showed that SSF-PAPO was competitive with the conventional solid-state fermentation (cSSF) in biomass accumulation and wheat straw digestion. With solid-liquid ratio 1:3, microbial biomass production at 72 h was high up to 2 x 10(11) cfu g(-1), nearly twice as that in cSSF. The degradation rate of cellulose, hemicellulose and lignin after fermentation in SSF-PAPO reached 48.57 +/- 10.66, 84.77 +/- 2.75 and 2.15 +/- 10.11, respectively, which was greater than that of 29.30 +/- 10.28%, 33.47 +/- 4.85% and 0.53 +/- 9.07% in cSSF, correspondingly. The SSF-PAPO system displayed unique advantage, by a novel gas phase control strategy on gas concentration and heat gradient, on the bioconversion of wheat straw to the bio-organic fertilizer.
authors.affiliation: State Key Laboratory of Biochemical Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Graduate School of the Chinese Academy of Sciences, Beijing, China. hzchen@home.ipe.ac.cn
authors.forename: Hongzhang
authors.initials: H
authors.lastname: Chen
authors.forename: Fubao
authors.initials: F
authors.lastname: Sun
mesh_terms: D001395:Azotobacter / Q000502:physiology*; D019149:Bioreactors / Q000382:microbiology*; D001711:Biotransformation / Q000502:physiology; D018929:Cell Culture Techniques / Q000379:methods*; D049109:Cell Proliferation; D005308:Fertilizers / Q000382:microbiology*; D009930:Organic Chemicals / Q000378:metabolism*; D035261:Plant Components, Aerial / Q000737:chemistry / Q000382:microbiology*; D014908:Triticum / Q000737:chemistry / Q000382:microbiology*
chemical_list: D005308:Fertilizers; D009930:Organic Chemicals