title: Granule development and performance in sucrose fed anaerobic baffled reactors.
abstract: Two 90 L anaerobic baffled reactors were used to study the granulation of sludge and the effect of the organic loading rate and NaHCO3/COD ratios on reactor performance. Furthermore, it was determined whether an anaerobic baffled reactor would promote phase separation and if additive of bentonite or granular active carbon was capable of enhancing granule formation. In order to minimize feed variations, and have a totally biodegradable substrate, a synthetic sucrose substrate was used. Granulation was achieved in both reactors within 75 days. However, the granules from the granular active carbon amended reactor appeared earlier and were larger and more compact. The reactors were maintained at a hydraulic retention time of 20 h during performance study stage. The results showed that when organic loading rate were changed from 2.15 to 6.29 kg COD m(-3)day(-1), chemical oxygen demand (COD) removal was not decreased (91-93%), but a slight increase in effluent COD was observed. It was found that the COD removals were generally good (87-92%) and had not obviously change with the decreasing NaHCO3/COD ratios. From the bacterial distribution and the concentration of volatile fatty acids in four compartments, it was concluded that a separation of phases occurred within the anaerobic baffled reactors.
authors.affiliation: Laboratory of Marine Environmental Science and Ecology, College of the Environmental Science and Engineering, Ocean University of China, No. 5 Yushan Road, Qingdao 266003, China. shezonglian@hotmail.com
authors.forename: Zonglian
authors.initials: Z
authors.lastname: She
authors.forename: Xilai
authors.initials: X
authors.lastname: Zheng
authors.forename: Bairen
authors.initials: B
authors.lastname: Yang
authors.forename: Chunji
authors.initials: C
authors.lastname: Jin
authors.forename: Mengchun
authors.initials: M
authors.lastname: Gao
mesh_terms: D000180:Acrylic Resins / Q000378:metabolism; D000693:Anaerobiosis; D001421:Bacteria, Anaerobic / Q000378:metabolism*; D001546:Bentonite / Q000378:metabolism; D001673:Biodegradation, Environmental; D019149:Bioreactors / Q000382:microbiology*; D002254:Carbonates / Q000378:metabolism; D007218:Industrial Microbiology / Q000379:methods*; D010100:Oxygen / Q000378:metabolism; D012722:Sewage / Q000382:microbiology*; D013395:Sucrose / Q000378:metabolism; D000099166:Polyacrylamides
chemical_list: D000180:Acrylic Resins; D001546:Bentonite; D002254:Carbonates; D010100:Oxygen; D012722:Sewage; D013395:Sucrose; D000099166:Polyacrylamides; C005686:sodium carbonate