Temperature-dependent and surface specific formaldehyde degradation in submerged biofilters

Microscreen effects on water quality in replicated recirculating aquaculture systems

“…Alkalinity check measurements were made weekly by using test strip kits (Hach ® AquaChek for Total Alkalinity, United States of America). Relative N-compounds (TAN, NO 2 -N and NO 3 -N) levels were monitored daily using test strip kits (Merck, United States of America) as described in Pedersen et al (2007). Fish were inspected daily and any moribund or dead fish were removed from the systems.…”

Biodegradation of mixture of phenol and formaldehyde in wastewater using a single-basin MSCR process

“…Biological processes are widely preferred due to their capability of eliminating a wide range of contaminants, flexibility and reliability, simplicity of operation and maintenance, cost-effectiveness, environmental benignity, degradation of contaminants to less toxic or harmful products rather than transferring them into another phase, potential for full-scale applications, etc. Several reports have been published on the biological removal of phenol (e.g., Busca et al, 2008;Moussavi et al, 2009a) and formaldehyde (e.g., Pedersen et al, 2007;Pereira and Zaiat, 2009), suggesting the bioprocess as a viable method for treating effluents containing such compounds. Nonetheless, literature on the biodegradation of the mixture of phenol and formaldehyde from wastewater is limited (Eiroa et al, 2005;Kochany and Lipczynska-Kochany, 2009), However, as noted above, when dealing with wastewater generated in PF resin synthesis plants, the simultaneous elimination phenol and formaldehyde, each at concentration up to several hundred mg L −1 , is required.…”

Storage of Pacific oysters Crassostrea gigas in recirculating tank: Ammonia excretion and potential nitrification rates

“…The extrapolation of the results to an oyster population kept in a recirculating tank (n = 2655 individuals, mean total weight (±SD): 67.8 ± 9.78 g), corresponding to a total surface area of 46.6 m 2 , gives a PNR estimation of 342 mol h −1 (83 mol h −1 for the internal surface and 259 mol h −1 for the external surface). In these conditions, the specific surface area calculated was 360 m 2 /m 3 which was comparable to the biofilters used in fish RAS that usually provide a specific surface area of between 100 and 300 m 2 /m 3 (Pedersen et al, 2007;Timmons et al, 2006;Tseng and Wu, 2004). The estimation of the specific surface area enabled the efficiency of the biofilter to be assessed.…”