packed bed Articles
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Biosorption of lead by the immobilised fungus Phanerochaete chrysosporium in a packed bed column
Biosorption of lead by immobilised Phanerochaete chrysosporium over two successive cycles of sorption-desorption was investigated in a continuously operated packed bed column. The breakthrough curves in each sorption cycle were measured as a function of different bed depths in the column at an inlet lead concentration of 40 mg/L. The values of various breakthrough parameters obtained in the study ...
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Basics of Mist Elimination
Mist eliminators have evolved over the years from packed bed types to knitted mesh mist collectors. Knitted mesh mist eliminators achieve much greater efficiency than the packed bed types where dumped packing is used as a collection device and impingement types where wave-like plates are used to collect mist. This presentation will discuss the basic concepts of mist elimination, whether the ...
By Kimre Inc.
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Modified crab shell particles for the removal of lead[II] ions from aqueous solutions
The ability of crab shell particles to remove lead[II] was evaluated in a batch reactor and in a fixed–bed column. The binding of lead[II] by crab shell was found to be affected significantly by pH, with maximum sorption capacity 714 mg/g observed at pH 4. The sorption isotherm of lead[II] on crab shell particles was modelled by the application of Langmuir followed by Sips, Redlich–Peterson and ...
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Effect of earthworm loads on organic matter and nutrient removal efficiencies in synthetic domestic wastewater, and on bacterial community structure and diversity in vermifiltration
In this paper, we studied the effect of earthworm loads on the removal rates of chemical oxygen demand (COD), ammonia nitrogen (NH3-N), total nitrogen, and total phosphorus from synthetic domestic sewage and on the bacterial community structure and diversity of substrates in earthworm packing beds. The different vermifiltrations (VFs), including the control, are successful in removing both ...
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Biosorptional studies on heavy metals in an up-flow packed bed reactor using biomaterials
Biosorption of copper, chromium, lead and cadmium in an up-flow packed-bed bioreactor with biosorbents [sanitary sewage sludge (SS), powdered coconut shell (PCS)] was conducted in a search for solutions to the environmental problem caused by heavy metals. Analysis of the results, demonstrated that the adsorbent had an extraordinary capacity for biosorption of the heavy metals, with a removal ...
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Influence of liquid redistributors on the mass-transfer efficiency of packed columns
In industrial mass-transfer columns liquid distributors and redistributors are used to mix the liquid after a certain random packing or structured packing height before it is applied to the next bed. The purpose of this is to counter a possible deterioration of the mass-transfer efficiency along the height of the column as a result of wall flow tendency of the liquid or to minimize the ...
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A new strategy for determination of current efficiency during electro-oxidation of aromatic compounds in a packed-bed system
The electro-oxidation of aromatic compounds in 4,4′-diaminostilbene-2,2′-disulfonic (DSD) acid wastewater on IrO2–Ta2O5/Ti anodes was studied. The current efficiency was evaluated in terms of chemical oxygen demand (COD) by introducing a new factor, the fraction of the Faradaic current to the total cell current (β) through the network analysis of packed bed electrode system (PBEs). Experimental ...
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Layered double hydroxide (LDH)-coated attapulgite for phosphate removal from aqueous solution
In this study, a composite adsorbent, layered double hydroxide (LDH)-coated attapulgite (LDH-AP), was synthesized and characterized. Its potential application for LDH stabilizer and phosphate (P) removal from aqueous solution was evaluated using the batch mode and continuous mode in a packed bed column. The batch experiments revealed that the data of P adsorption onto LDH-AP could be well ...
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Safety and Corrosion Protection in Refineries
The environment in a refinery is highly corrosive, which makes it necessary to implement control systems not only to protect people but also the equipment that controls the processes to ensure their reliability. Bioconservacion has equipment specially designed for the safety of people, to protect against corrosion in control rooms and cabinet pressurization equipment. Some CEPSA refineries in ...
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High rate anaerobic thermophilic technologies for distillery wastewater treatment
ABSTRACTIn this paper, performance of two high rate technologies, upflow anaerobic fixed-film reactor and fluidized bed laboratory-scale, treating distillery wastewater (wine vinasses ) at anaerobic thermophilic conditions have been compared. The results obtained show that the stationary packed bed, with a corrugated plastic support, operated under stable conditions at organic loading rates ...
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Analysis and optimization of ammonia stripping using multi-fluid model
Ammonia recovery from anaerobic digestion (AD) is a notably beneficial process for removing excess nitrogen, producing low cost fertilizer and enhancing odor abatement. A process was developed for nutrients recovery by integrating a simple and effective stripping process with AD system. To design, optimize and scale up this system, multi-fluid model was developed to simulate flow, mass transfer ...
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Development of a packed-bed reactor for the recovery of metals from industrial wastewaters
Affinity separation is becoming well established for the purification and recovery of metals from industrial wastewaters. Although the method has been successfully applied on a bench-scale, there is a need for reaction engineering studies to scale-up the process for use in large-scale wastewater purification and recovery of valuable metals. In this study, a pilot-scale packed-bed reactor has been ...
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Case Study: Packed bed scrubber
StockPot, a Campbell's Soup subsidiary, makes premium soups, sauces, chilies and marinades for the foodservice industry. The company chose a Tri-Mer Odor Control System, a 40,000 cfm packed bed scrubber. Tri-Mer packed towers are well-suited to the foods and flavors industries and perform at efficiencies of 99% and higher. They are ideal for odors that are detectable below 1 ppm. And, where ...
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Biological Cr(VI) removal using bio-filters and constructed wetlands
The bioreduction of hexavalent chromium from aqueous solution was carried out using suspended growth and packed-bed reactors under a draw-fill operating mode, and horizontal subsurface constructed wetlands. Reactors were inoculated with industrial sludge from the Hellenic Aerospace Industry using sugar as substrate. In the suspended growth reactors, the maximum Cr(VI) reduction rate (about 2 ...
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Effect of diffusional mass transfer on the performance of horizontal subsurface flow constructed wetlands in tropical climate conditions
The effect of mass transfer on the removal rate constants of BOD5, NH3, NO3 and TKN has been investigated in a Horizontal Subsurface Flow Constructed Wetland (HSSFCW) planted with Phragmites mauritianus. The plug flow model was assumed and the inlet and outlet concentrations were used to determine the observed removal rate constants. Mass transfer effects were studied by assessing the influence ...
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What is a Wet Scrubber?
Introduction to Industrial Scrubbers If you are a plant manager, a process engineer, or a purchasing or Environmental Health and Safety (EHS) professional who works in industrial manufacturing or the wastewater treatment industry, then you may be seeking a solution to remove harmful pollutants and odors from your process exhaust streams before they are released into the atmosphere and ...
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Viscous dissipation effects on entropy generation and heat transfer in cylindrical packed beds subjected to reciprocating flow
A numerical study of the viscous dissipation effects on entropy generation for oscillating flow, within a cylinder filled with a porous medium and heated by a constant heat flux at the wall, was carried out in laminar flow regime. The flow is modelled by the Brinkman–Lapwood–Forchheimer–extended Darcy model (DBLF). The mathematical model for energy transport is based on the local thermal ...
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Packed Bed System (PBS) - City of Spokane, Washington, USA - Case Study
THE PROBLEM: It is very difficult to confirm odor levels when digging deep. While time and preparation go into design for a particular type of odor, more odors may present themselves during production. Furthermore, it is important to know the surrounding geography. For this project, the deep tunneling was near the La Brea Tar pits, which presented a serious concern because the H2S levels were ...
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Air pollution control by different types of wet air scrubbers
A wet air scrubber is an air treatment device that removes particulate matter from gas streams by catching the particles into liquid droplets directly on contact in order to provide air pollution control. The basic activity of wet scrubbers is to perform contact between the scrubbing liquid or simply water and, the particulate to be collected. The air pollution control can be achieved in ...
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Scale-up of a packed bed column for wastewater treatment
After checking the success of the biosorption process to remove heavy metals from wastewater using olive tree pruning as a cheap biosorbent in the laboratory scale, the scale-up is necessary to progress towards industrial applications chance. The aim of this work was the study of the effect of scale-up in the process of biosorption of Pb(II) with olive tree pruning in a packed bed column. ...
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