Nitrification in moving bed and fixed bed biofilters treating effluent water from a large commercial outdoor rainbow trout RAS

2010 ◽  
Vol 42 (1) ◽  
pp. 31-37 ◽  
Author(s):  
K.I. Suhr ◽  
P.B. Pedersen
Keyword(s):  
Rainbow Trout ◽  
Fixed Bed ◽  
Effluent Water ◽  
Moving Bed ◽  
Treating Effluent

scholarly journals The Fate of Bacteriophages in Recirculating Aquaculture Systems (RAS)—Towards Developing Phage Therapy for RAS

Antibiotics ◽  
2019 ◽  
Vol 8 (4) ◽  
pp. 192 ◽  
Author(s):  
Gabriel M.F. Almeida ◽  
Kati Mäkelä ◽  
Elina Laanto ◽  
Jani Pulkkinen ◽  
Jouni Vielma ◽  
...  
Keyword(s):  
Rainbow Trout ◽  
Phage Therapy ◽  
Fixed Bed ◽  
Controlled Study ◽  
Water Volume ◽  
Flavobacterium Columnare ◽  
Moving Bed ◽  
Rainbow Trout Oncorhynchus Mykiss ◽  
Recirculating Aquaculture ◽  
Recirculating Aquaculture Systems

Aquaculture production has increased tremendously during the last decades, and new techniques have been developed, e.g., recirculating aquaculture systems (RAS). In RAS, the majority of water volume is circulated via mechanical and biological filters and reused in the tanks. However, the prevention and treatment of diseases in these systems are challenging, as the pathogens spread throughout the system, and the addition of chemicals and antibiotics disrupts the microbiome of the biofilters. The increasing antibiotic resistance has made phage therapy a relevant alternative for antibiotics in food production. Indeed, as host-specific and self-replicating agent they might be optimal for targeted pathogen eradication in RAS. We tested the survival and spread of Flavobacterium columnare -infecting phage FCL-2 in recirculating aquaculture fish farm with rainbow trout (Oncorhynchus mykiss) in a fully controlled study. After a single addition, phage persisted in water samples collected from tank, fixed bed, moving bed, and aeration unit up to 14 days, and in the water of rearing tanks, rainbow trout mucus, and bioreactor carrier media from the fixed and moving bed biofilters for 21 days. Furthermore, phage adsorbed preferentially to moving bed carrier media, which contained biofilm attached and from which higher phage numbers were recovered. This study shows phages as a potent strategy for maintaining biosecurity in RAS systems.

scholarly journals The influence of large wood and rootwad on flow patterns and bed morphology in a moving bed channel

2018 ◽  
Vol 40 ◽  
pp. 02044
Author(s):  
Su-Chin Chen ◽  
Min-Chih Liang ◽  
Samkele Tfwala
Keyword(s):  
Field Experiments ◽  
Morphological Changes ◽  
Fixed Bed ◽  
Flow Patterns ◽  
Large Wood ◽  
River Channels ◽  
Moving Bed ◽  
Bed Topography ◽  
Bed Elevation ◽  
Elevation Changes

Studying large wood in river channels can help gain insight on their form and processes. Over the preceding decade, laboratory and field experiments have been used to explain wood dynamics, flow patterns and sediment transport. Moreover, field experiments are sparse, while laboratory experiments have focused mostly on fixed bed to capture their entrainment. To enhance our scientific understanding on logs of different morphology, this study designed an experimental flume to investigate the effects of log presence on flow and bed topography in a moving bed channel. Two log configurations were used, with and without rootwad. Wood pieces had a length of 0.2 m, diameter 0.05 m and a density of approximately 760 kg/m3. Rootwad were simulated by joining 0.06 m wood pieces, having a diameter of 0.02 m to the base of the log pieces at an angle of 30°. The experiments were carried out in a 4 m long flume, 0.6 m width and 0.6 m deep, and having a slope of 0.001. The experimental bed zone was paved with uniform sand, d50 = 0.750 mm, of 0.1 m thickness. Flow in the channel was set such that it was below the critical flow for wood entrainment, and it ranged between 0.0015 to 0.005 m3/s. Three different orientations of the log were considered, namely parallel, oblique and transverse to flow. Bed evolution was monitored using a camera and a laser mounted on a moving motor frame. This research shows that log orientation and the presence of rootwad dictate bed elevation changes and stability of single wood pieces. In addition, the contrast of morphological changes caused by the presence of abundant wood in a moving bed is crucial in determining large wood appropriate for river restoration. Our study provokes fascinating questions for future investigations.

scholarly journals The application of ceramic membranes for treating effluent water from closed-circuit fish farming

2016 ◽  
Vol 42 (2) ◽  
pp. 59-66 ◽  
Author(s):  
Małgorzata Bonisławska ◽  
Arkadiusz Nędzarek ◽  
Arkadiusz Drost ◽  
Agnieszka Rybczyk ◽  
Agnieszka Tórz
Keyword(s):  
Suspended Solids ◽  
Fish Farming ◽  
Ceramic Membranes ◽  
Total Iron ◽  
African Catfish ◽  
Effluent Water ◽  
Filtration System ◽  
Rejection Coefficient ◽  
Filtration Stage ◽  
Treating Effluent

Abstract The aim of the study was to analyze and assess the possibility of using a two-stage filtration system with ceramic membranes: a 3-tube module with 1.0 kDa cut-off (1st stage) and a one-tube module with 0.45 kDa cut-off (2nd stage) for treating effluent water from a juvenile African catfish aquaculture. The study revealed that during the 1st filtration stage of the effluent water, the highest degrees of retention were obtained with respect to: suspended solids SS (rejection coefficient RI=100%), turbidity (RI=99.40%), total iron (RI=89.20%), BOD5 (RI=76.0%), nitrite nitrogen (RI=62.30%), and CODCr (RI=41.74%). The 2nd filtration stage resulted in a lower reduction degree of the tested indicators in comparison to the 1st filtration stage. At the 2nd stage, the highest values of the rejection coefficient were noted in for the total iron content (RIV=100%), CODCr (RIV=59.52%; RV=64.28%, RVI=63.49%) and turbidity (RIV and RV = 45.0%, RVI=50.0%). The obtained results indicate that ceramic membranes (with 1.0 and 0.45 kDa cut-offs) may be used in recirculation aquaculture systems as one of the stages of effluent water treatment.

HS retention with Ca-based sorbents in a pressurized fixed-bed reactor: application to moving-bed design

Fuel ◽  
2005 ◽  
Vol 84 (5) ◽  
pp. 533-542 ◽  
Author(s):  
J ADANEZ ◽  
A ABAD ◽  
F GARCIALABIANO ◽  
L DEDIEGO ◽  
P GAYAN
Keyword(s):  
Fixed Bed ◽  
Fixed Bed Reactor ◽  
Moving Bed ◽  
Reactor Application

scholarly journals Combined Solar Thermochemical Solid/Gas Energy Storage Process for Domestic Thermal Applications: Analysis of Global Performance

2019 ◽  
Vol 9 (9) ◽  
pp. 1946 ◽  
Author(s):  
Oleksandr Skrylnyk ◽  
Emilie Courbon ◽  
Nicolas Heymans ◽  
Marc Frère
Keyword(s):  
Energy Storage ◽  
Fixed Bed ◽  
Packed Bed ◽  
Pilot Scale ◽  
Hot Water ◽  
Water Tank ◽  
Atmospheric Conditions ◽  
Storage Process ◽  
Moving Bed ◽  
Global Performance

Thermal energy used below 100 °C for space heating/cooling and hot water preparation is responsible for a big amount of greenhouse gas emissions in the residential sector. The conjecture of thermal solar and thermochemical solid/gas energy storage processes renders the heat generation to become ecologically clean technology. However, until present, few pilot scale installations were developed and tested. The present work is devoted to the experimental study of global performance of a pilot scale thermochemical energy storage prototype. Two working modes, namely fixed packed bed and moving bed, were tested using 2.2 kg and 5.5 kg of composite material (silica gel impregnated with calcium chloride) under indoor atmospheric conditions. The global experimental efficiency of a 49l water tank charging process during 75 min was found as high as 0.8–0.85. The energy storage density reached in the fixed bed mode by the material was 158 kWh/m3, while in the moving bed mode it was 2.5 times lower. The reasons for such a difference are discussed in depth in the text.

Study on the Combination of Fixed Bed and Moving Bed Biofilm Reactor for Papermaking Terminal Wastewater Treatment

2013 ◽  
Vol 777 ◽  
pp. 309-313
Author(s):  
Zong Zheng Yang ◽  
Zhi Meng Yang ◽  
Jin Guo Cao ◽  
Yuan Yuan Jia ◽  
Jun Xia Xu
Keyword(s):  
Water Discharge ◽  
Black Liquor ◽  
Fixed Bed ◽  
Biofilm Reactor ◽  
Moving Bed Biofilm Reactor ◽  
Moving Bed ◽  
Paper Making ◽  
White Water ◽  
High Level

Papermaking wastewater mainly consists of black liquor, intermediate wastewater and white water. It suffers from its heavy amount, high level suspended solids and poor biodegradable property. In this paper, a combination of fixed bed and moving bed biofilm reactor was conducted to treat paper making wastewater in order to make full use of the advantages of both fixed bed and moving bed. As a result, the average values of COD, NH3-N and SS in effluent are 57.01 mg/L, 1.74 mg/L and 38 mg/L, respectively. The quality of the effluent could meet the demands of the Chinese standards for papermaking industrial water discharge pollutant.

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