Treatment of food processing wastewater in a full-scale jet biogas internal loop anaerobic fluidized bed reactor

Abstract

A full-scale jet biogas internal loop anaerobic fluidized bed (JBILAFB) reactor, which requires low energy input and allows enhanced mass transfer, was constructed for the treatment of food processing wastewater. This reactor has an active volume of 798 m(3) and can treat 33.3 m(3) wastewater per hour. After pre-treating the raw wastewater by settling, oil separating and coagulation-air floating processes, the reactor was operated with a relatively shorter start-up time (55 days). Samples for the influent and effluent of the JBILAFB reactor were taken and analyzed daily for the whole process including both the start-up and stable running periods. When the volumetric COD loading fluctuated in the range of 1.6-5.6 kg COD m(-3) day(-1), the COD removal efficiency, the volatile fatty acid(VFA)/alkalinity ratio, the maximum biogas production and the content of CH(4) in total biogas of the reactor were found to be 80.1 ± 5%, 0.2-0.5, 348.5 m(3 )day(-1) and 94.5 ± 2.5%, respectively. Furthermore, the scanning electron microscope (SEM) results showed that anaerobic granular sludge and microorganism particles with biofilm coexisted in the reactor, and that the bacteria mainly in bacilli and cocci were observed as predominant species. All the data demonstrated that the enhanced mass transfer for gas, liquid and solid phases was achieved, and that the formation of microorganism granules and the removal of inhibitors increased the stability of the system.

Comparison of Asian Aquaculture Products by Use of Statistically Supported Life Cycle Assessment

“…Emissions from processing plants of soybeans were modelled as a globally averaged process (USB 2010;Wei et al 2011;Hongyang et al 2011). Where available, the distribution and inherent uncertainty was determined from available data (e.g.…”

“…Where available, the distribution and inherent uncertainty was determined from available data (e.g. Wei et al 2011), otherwise a default log-normal distribution of σ g i = 1.5 was assumed. Where only individual values were available, a default spread of CV = 0.431 (σ g s = 1.5) was assumed, based upon other values.…”

Using wastewater after lipid fermentation as substrate for bacterial cellulose production by Gluconacetobacter xylinus

“…However, this method has two disadvantages: on the one hand, it requires some special equipment such as UASB or EASB (Colussi, Cortesi, Vedova, Gallo, & Robles, 2009;Wei et al, 2011); on the other hand, the fermentable compounds in the fermentation wastewater cannot be utilized to get higher economic benefits.…”

Acetone-Butanol-Ethanol (ABE) Fermentation Wastewater Treatment by Oleaginous Yeast Trichosporon cutaneum

“…Traditionally, fermentation wastewaters with high COD value are usually treated by anaerobic technology using special equipments such as upflow anaerobic sludge blanket (UASB) or extended anaerobic sludge blanket (EASB) [6,7]. Recently, oleaginous yeast was shown as one promising alternative for wastewaters treatment due to its simple fermentation technology and common equipment [8].…”