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Screening and selection of microfungi for microbial biomass protein production and water reclamation from starch processing wastewater
Author(s) -
Jin Bo,
van Leeuwen JHans,
Yu Q,
Patel B
Publication year - 1999
Publication title -
journal of chemical technology and biotechnology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.64
H-Index - 117
eISSN - 1097-4660
pISSN - 0268-2575
DOI - 10.1002/(sici)1097-4660(199902)74:2<106::aid-jctb999>3.0.co;2-l
Subject(s) - microfungi , biomass (ecology) , wastewater , starch , rhizopus arrhizus , food science , aspergillus niger , compost , rhizopus , chemistry , rhizopus oryzae , chemical oxygen demand , aspergillus oryzae , pulp and paper industry , aspergillus awamori , feather meal , agronomy , biology , botany , environmental science , environmental engineering , fermentation , lipase , fish meal , biochemistry , enzyme , engineering , fishery , fish <actinopterygii>
Thirty strains of microfungi and amylolytic yeasts were screened for production of microbial biomass protein (MBP) and water reclamation from starch processing wastewater (SPW). Three species and six strains of microfungi Aspergillus oryzae , Rhizopus oligosporus and Rhizopus arrhizus showing high enzymatic activities on SWP were selected under non‐aseptic growth conditions. In 20 h submerged cultivation the selected strains had a high capacity to enzymatically hydrolyse more than 93% of the starch and produce 4.3–5.6 g dm −3 of dry biomass at a specific biomass growth rate from 0.05 to 0.12 h −2 . The fungal biomass contained crude protein ranging from 37.5 to 49.8% of dry biomass. The pellet and flocculated biomass products were easily harvested by simple filtration or sedimentation. After these processes, 76–88% of total organic carbon (TOC), 85%–92% of chemical oxygen demand (COD) and 95% suspended solids in SPW were removed, and the treated water was reusable for farm irrigation. Typical pretreatment processes including hydrolysis, sterilisation and nutrient supplementation were unnecessary. © 1999 Society of Chemical Industry