Effect of operating conditions on solid velocity in the spout, annulus and fountain of spouted beds

Hydrodynamics of Flows and Heat Transfer in Spouted Beds

A cluster structure-dependent drag coefficient model applied to risers

Phenol is one of the organic pollutants in various industrial wastewaters especially petrochemical and oil refining. Biological treatment is one of the considerable choices for removing of phenol present in these wastewaters. Identification of effective microbial species is considered as one of the important priorities for production of the biomass in order to achieve desirable kinetic of biological reactions. Basic purpose of this research is identification of phenol-degrading Pseudomonas Putida in activated sludge by polymerase chain reaction (PCR) that has high speed and specificity. In this research, 10 various colonies of phenol-degrading bacteria were isolated from municipal activated sludge and the rate of phenol removal and growth rate of these bacteria were assessed in different concentrations of phenol (200 – 900 mg/L). Confirmation of the largest subunit of multicomponent phenol hydroxylase (LmPH) gene and gene coding the N fragment in Pseudomonas Putida-derived methyl phenol operon (DmpN gene) through PCR were used for general identification of phenol-degrading bacteria and Pseudomonas Putida, respectively. Presence of a 600 bp (base pairs) bond in all of isolated strains indicated that they contain phenol hydroxylase gene. 6 of 10 isolated bacteria were Pseudomonas Putida because they produced a 199 bp PCR product by DmpN primers. According to PCR results in this study, the best phenol-degrading bacteria that can utilize 500 – 600 mg/L phenol completely after 48 hours incubation, belong to Pseudomonas Putida strains. It is clear that use of isolated bacteria can lead to considerable decrease of treatment time as well as promotion of phenol removal rate.

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Detection of phenol degrading bacteria and pseudomonas putida in activated sludge by polymerase chain reaction

Solids friction factors in upward, lean gas-solids flows

An experimental study on hydrodynamics of a system in a pneumatic flash dryer

An integrated pervaporation–biodegradation process of phenolic wastewater treatment

The possibility of using electromagnetic field (EMF) in order to achieve more efficient phosphorus (P) reduction in wastewater treated in metal packing systems was investigated. The waste made of powdered milk and typical domestic sewage from municipal sewers were used in the experiment. The impact of the kind of digested metal (Al, Fe) on the effectiveness of the phosphorus compounds (P–PO4, Ptot) and organic compounds (COD) reduction was determined. Moreover, the importance of the EMF in a decrease in the concentration of these compounds was investigated. The most efficient was the system that combined simultaneously physical factor and steel filling. This technological variant seems to be the most effective as it allows us to remove from 38% to 98% of total phosphorus and from 10% to 63% of COD, depending on the retention time. A 48-hour retention time made it possible to remove the whole amount of phosphorus (P–PO4) from the sewage treated.

S. Mielczarski

Papers

An experimental study on hydrodynamics of a system in a pneumatic flash dryer

An integrated pervaporation–biodegradation process of phenolic wastewater treatment

The influence of a const ant electromagnetic field on phosphorus removal from wastewater in metal packing systems