H2-Based Membrane Catalyst-Film Reactor (H2-MCfR) Loaded with Palladium for Removing Oxidized Contaminants in Water

2021 ◽  
Author(s):  
Dandan Zhou ◽  
Yi-Hao Luo ◽  
Chen-Wei Zheng ◽  
Min Long ◽  
Xiangxing Long ◽  
...  
Keyword(s):  
Membrane Catalyst ◽  
Catalyst Film ◽  
Film Reactor

Starting-Up of an Anaerobic Fixed-Film Reactor

1983 ◽  
Vol 15 (8-9) ◽  
pp. 305-308 ◽  
Author(s):  
M S Salkinoja-Salonen ◽  
E.-J Nyns ◽  
P M Sutton ◽  
L van den Berg ◽  
A D Wheatley
Keyword(s):  
Fixed Film ◽  
Film Reactor

Tertiary nitrification in pilot-plant plug-flow fixed-film reactors with long-term ammonium deficiency

1994 ◽  
Vol 29 (10-11) ◽  
pp. 61-67 ◽  
Author(s):  
M. Fruhen ◽  
K. Böcker ◽  
S. Eidens ◽  
D. Haaf ◽  
M. Liebeskind ◽  
...  
Keyword(s):  
Pilot Plant ◽  
Effective Means ◽  
Plug Flow ◽  
Nitrification Rate ◽  
Industrial Project ◽  
Transfer Processes ◽  
Fixed Film ◽  
Film Reactor ◽  
Observation Period

The objective of this study is to investigate to what extent the nitrification capacity of a pilot-plant fixed-film reactor changes during extensive periods of nutrient supply deficiency. The examined pilot-plant was an upflow reactor filled with swelling clay of medium grain size (6 to 8 mm). The experiments revealed that the maximum nitrification rate remained practically constant during the first weeks after the onset of unregulated ammonium supply. The capacity declined slowly, dropping to approximately 66% of the initial capacity after about ten weeks. Still ammonium peaks of up to 8 mg/l were readily nitrified throughout the entire period of the experiment. The reduction in nitrification capacity during the observation period did not result from decay processes of biomass but from the reactor becoming blocked and thus hampering transfer processes. It could be observed that the detached organisms attached again further up. This semi-industrial project demonstrated that a plug-flow fixed-film reactor can be used as effective means of tertiary nitrification.

Comparison of suspended and fixed photocatalytic reactor systems

2001 ◽  
Vol 44 (5) ◽  
pp. 245-249 ◽  
Author(s):  
S.-U. Geissen ◽  
W. Xi ◽  
A. Weidemeyer ◽  
A. Vogelpohl ◽  
L. Bousselmi ◽  
...  
Keyword(s):  
Membrane Filtration ◽  
Cross Flow ◽  
Transmembrane Pressure ◽  
Specific Flow ◽  
Process Step ◽  
Photocatalytic Reactor ◽  
Influent Concentration ◽  
Film Reactor ◽  
Rich Countries ◽  
Optimized Conditions

Photocatalysis is a promising technology for the purification of pretreated wastewaters in sun-rich countries if an economically applicable reactor system is available. Within this project the catalyst separation as an essential process step of suspended reactor systems was investigated. For the separation of suspended catalyst a sedimentation basin with and without lamella and a membrane filtration were investigated. The sedimentation was found to be very sensitive to the kind of the ion background of wastewater, the pH, the TiO2 influent concentration as well as the hydrodynamics in the clarifier. Under optimized conditions effluent concentrations of less than 5 mg SS/L and a clear water without turbidity could be reached with a specific flow rate of up to 0.7 m3/m2/h. The best performance for P25 was achieved with a TiO2 influent concentration of 5 g/L. Membrane filtration was the only method to guarantee a complete retention of the TiO2 as well as a rejection of microorganisms and high molecular compounds. With cross-flow velocities of 3 m/s and a transmembrane pressure of 100 kPa flux rates up to 1200 L/m2/h were achieved. A flow-film-reactor (FFR) was operated with the model compound DCA under identical conditions with fixed and suspended TiO2. Whereas the fixed system has the advantage that no separation step is necessary and a simple construction can be used, suspended systems offer a three times higher reaction velocity for a catalyst concentration of 10 g/L, but are also characterized by higher investment costs.

Falling film reactor modelling for sulfonation reactions

2019 ◽  
Vol 377 ◽  
pp. 120464 ◽  
Author(s):  
Vincenzo Russo ◽  
Antonio Milicia ◽  
Martino Di Serio ◽  
Riccardo Tesser
Keyword(s):  
Falling Film ◽  
Film Reactor
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