Effects of reactor geometry and electron donor on performance of the hybrid linear flow channel reactor

AbstractSemi-passive remediation systems have the potential to treat low-volume, sulphate-rich, mining impacted waters in a cost-effective and sustainable way. This paper describes the “proof of concept” evaluation of a hybrid linear flow channel reactor, capable of sustaining efficient biological sulphate reduction and partial oxidation of the sulphide product to elemental sulphur. Key elements include the presence of a sulphate-reducing microbial community, immobilised onto carbon fibres and the rapid development of a floating biofilm at the air-liquid interface. The biofilm consists of heterotrophic species and autotrophic sulphide oxidisers. It impedes oxygen mass transfer into the bulk volume and creates a suitable pH-redox microenvironment for partial sulphide oxidation. Demonstration of the concept was successful, with near 20 complete reduction of the sulphate in the feed (1 g/l), effective management of the sulphide generated (95-100% removal) and recovery of a portion of the sulphur by harvesting the elemental-sulphur-rich biofilm. The biofilm re-formed within 24 hours of harvesting, with no decrease in volumetric sulphate reduction rate during this period. Colonisation of the carbon microfibers by sulphate reducing bacteria ensured biomass retention, suggesting the reactor could remain effective at high volumetric flow rates.

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A flow channel reactor for GaAs vapor phase epitaxy

Journal of Crystal Growth ◽

10.1016/0022-0248(82)90450-x ◽

1982 ◽

Vol 56 (2) ◽

pp. 324-331 ◽

Cited By ~ 11

Author(s):

G.H. Westphal ◽

D.W. Shaw ◽

R.A. Hartzell

Keyword(s):

Vapor Phase ◽

Vapor Phase Epitaxy ◽

Flow Channel ◽

Channel Reactor

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A STUDY OF HYDRAULIC AND NUCLEAR STABILITY OF BOILING WATER PARALLEL FLOW CHANNEL REACTOR SYSTEMS.

10.2172/4546942 ◽

1968 ◽

Author(s):

J.R. Worden ◽

D.S. Rowe ◽

P.J. Dionne

Keyword(s):

Parallel Flow ◽

Flow Channel ◽

Boiling Water ◽

Channel Reactor ◽

Nuclear Stability

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A Non-Linear Flow Channel Implementation Method in Magnetic Gap Space of Magneto-Rheological Valve

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.136.118 ◽

2010 ◽

Vol 136 ◽

pp. 118-121

Author(s):

Chun Rui Tang ◽

Dan Dan Liu

Keyword(s):

Magnetic Field ◽

Fluid Pressure ◽

Flow Channel ◽

Linear Flow ◽

Fluid Saturation ◽

Oil Distribution ◽

Non Linear ◽

Implementation Method ◽

Magneto Rheological ◽

The Magnetic Field

A non-linear flow channel implementation method in magnetic gap space of magneto-rheological valve is proposed in this paper. The involved magneto-rheological valve in the method has a non-line flow channel which is formed by magnetic gap space between oil inlet disc and oil distribution disc, the concentric annular trapezoidal concave of the surface of the oil inlet disc, the concentric annular trapezoidal convex of the surface of the oil distribution disc, the corresponding convex and concave trapezium between the inlet oil disc and the oil distribution disc, the surface of oil distribution disc and oil inlet disc. The method is beneficial, because the maximum magneto-rheological effect is produced by placing the magneto-rheological fluid in the magnetic field whose intensity is maximum and not more than magneto-rheological fluid saturation intensity, and the magneto-rheological fluid channel length is lengthen in the limited space of the magnetic gap, we can further poly-magnetic by using of separated magnetic sheeting under condition of taking full advantage a limited poly-magnetic cross-section of the magnetic field. The method can significantly enhance the magneto-rheological fluid pressure difference under the same magneto-rheological fluid and flow requirements, size requirements, response time requirements and energy requirements.

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Single and Multi-Channel Reactor for Oxidative Coupling of Methane

International Journal of Chemical Reactor Engineering ◽

10.1515/ijcre-2013-0161 ◽

2014 ◽

Vol 12 (1) ◽

pp. 181-189

Author(s):

Fereshteh Raouf ◽

Majid Taghizadeh ◽

Mohammad Yousefi

Keyword(s):

Oxidative Coupling ◽

Single Channel ◽

Tubular Reactor ◽

Oxidative Coupling Of Methane ◽

Operating Conditions ◽

Channel Reactor ◽

Steel Tubes ◽

Metal Compounds ◽

Reactor Geometry ◽

Total Productivity

Abstract Management of the produced heat has been one of the challenges encountered in the oxidative coupling of methane (OCM) process. In this study, the influence of the thermal conductive tubular reactor on the total productivity and selectivity of OCM was investigated. The reactors were made from three different metal compounds: two stainless steel tubes and one gold-coated copper tube, and their impact on the operating conditions was compared. 5% Li/MgO was prepared as a catalyst for OCM and characterized by XRD, CO2-TPD, FTIR, and BET. In addition, the effect of reactor geometry on the oxidative coupling process was investigated experimentally in the single channel and multi-channel reactors with different hydraulic diameters.

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Biological Desulfurization of Tannery Effluent Using Hybrid Linear Flow Channel Reactors

Water ◽

10.3390/w14010032 ◽

2021 ◽

Vol 14 (1) ◽

pp. 32

Author(s):

Emma Jane Horn ◽

Oluwaseun O. Oyekola ◽

Pamela Jean Welz ◽

Robert Paul van Hille

Keyword(s):

Anaerobic Digestion ◽

Elemental Sulfur ◽

Sulfide Oxidation ◽

Flow Channel ◽

Tannery Effluent ◽

Waste Streams ◽

Linear Flow ◽

Sulfate Reducing ◽

Tanning Process ◽

Reducing Bacteria

The tanning process generates a saline effluent with high residual organics, sulfate and sulfide concentrations. The transition from a linear to circular economy requires reimagining of waste streams as potential resources. The organics in tannery effluent have the potential to be converted to renewable energy in the form of biogas if inhibitors to anaerobic digestion are removed. Hybrid linear flow channel reactors inoculated with culture-enriched halophilic sulfate reducing bacteria from saline environments were evaluated as a novel pretreatment step prior to anaerobic digestion for the concurrent removal of sulfur species and resource recovery (elemental sulfur and biogas). During continuous operation of a 4-day hydraulic retention time, the reactors were capable of near-complete sulfide oxidation (>97%) and a sulfate reduction efficiency of 60–80% with the formation of a floating sulfur biofilm containing elemental sulfur. Batch anaerobic digestion tests showed no activity on untreated tannery effluent, while the pretreated effluent yielded 130 mL methane per gram COD consumed.

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