Feasibility Study on Isolation of Native Microorganism for Bioleaching of Electronic Waste

, M.Sc. Thesis Sharif University of Technology Gheshlaghi, Mahraz (Author) ; Yaghmaei, Soheila (Supervisor)

Abstract

Accumulation of electronic wastes in the environment is one of the recent ecological problems. This type of wastes contain metallic and non-metallic elements which can contaminate the environment. On the other hand due to the high volume of precious and basic metals within e-waste, it could be considered as a secondary resource. Bioleaching is a suitable method for the recovery of metals from e-waste which, on the contrary to the conventional recycling methods in the industry, is both economically and ecologically efficient. The aim of this research is the isolation of native micro-organism and evaluating its ability in recovering copper from a mixture of computer, cellphone, fax and copy...

The effect of KZK pressure equation on the sonoluminescence in water and fat tissues

, Article Physics Letters, Section A: General, Atomic and Solid State Physics ; Volume 379, Issue 36 , September , 2015 , Pages 1951-1959 ; 03759601 (ISSN) Gheshlaghi, M ; Sadighi Bonabi, R ; Ghadirifar, A ; Sharif University of Technology

Elsevier 2015

Abstract

Abstract The effect of the produced light flashes from sonoluminescence (SL) on the fat tissue and water is studied. By using KZK equation as an essential equation for calculating the thermal source in bio-liquids, the effective bubble parameters in quasi-adiabatic model are calculated and compared in these systems. It is noticed that the temperature and the intensity for fat tissue are about 30% and 38% less than the ones for water respectively. These results are almost in good agreement with the only experimental measurement denoting less SL temperature in bio-liquids which present more suitable condition for using SL in such applications

Experimental and numerical assessment of the lateral resistance of ballasted railway track equipped with mid-winged sleeper

, Article Scientia Iranica ; Volume 28, Issue 5 A , 2021 , Pages 2546-2556 ; 10263098 (ISSN) Sadollahzadeh, B ; Zakeri, J. A ; Nouri Gheshlaghi, H ; Hasani Motlagh, A ; Sharif University of Technology

Sharif University of Technology 2021

Abstract

In order to reduce the possibility of buckling problems related to the railway ballasted tracks, necessary measurements should be applied to improve the lateral resistance of tracks. There are different procedures for increasing the lateral force resistance of railway tracks that can be implemented using different materials to change the size, geometry, and dimensions of track components, especially sleepers. Although several studies have been conducted on winged sleepers, the present study investigates the application of mid-winged sleepers with a modified geometry and a dimension in the form of a novel approach. In this regard, several experimental tests and numerical modeling were...

Optimization of operating conditions in ultrafiltration process for produced water treatment via Taguchi methodology

, Article Desalination and Water Treatment ; Volume 54, Issue 10 , June , 2015 ; ISSN: 19443994 Reyhani, A ; Sepehrinia, K ; Seyed Shahabadi, S. M ; Rekabdar, F ; Gheshlaghi, A ; Sharif University of Technology

2015

Abstract

This paper describes how to find optimal operating conditions of three controlling parameters, i.e. temperature, transmembrane pressure (TMP), and cross-flow velocity (CFV) for maximizing the permeate flux and total organic carbons (TOC) rejection, and minimizing the fouling resistance using Taguchi method in ultrafiltration (UF) treatment of the real produced water. At first, the optimal operating conditions were found at a temperature of 45°C, TMP = 4 bar, and CFV of 2.25 m/s. To determine the most significant parameters affecting the response parameters, an analysis of variance was employed. In the second stage, performance of applied polymeric membrane in the UF system was studied under...

Optimization of operating conditions in ultrafiltration process for produced water treatment via Taguchi methodology

, Article Desalination and Water Treatment ; Volume 54, Issue 10 , May , 2015 , Pages 2669-2680 ; 19443994 (ISSN) Reyhani, A ; Sepehrinia, K ; Seyed Shahabadi, S. M ; Rekabdar, F ; Gheshlaghi, A ; Sharif University of Technology

Taylor and Francis Inc 2015

Abstract

This paper describes how to find optimal operating conditions of three controlling parameters, i.e. temperature, transmembrane pressure (TMP), and cross-flow velocity (CFV) for maximizing the permeate flux and total organic carbons (TOC) rejection, and minimizing the fouling resistance using Taguchi method in ultrafiltration (UF) treatment of the real produced water. At first, the optimal operating conditions were found at a temperature of 45°C, TMP = 4 bar, and CFV of 2.25 m/s. To determine the most significant parameters affecting the response parameters, an analysis of variance was employed. In the second stage, performance of applied polymeric membrane in the UF system was studied under...

Enhanced separation performance of PVDF/PAN blend membrane based on PVP tuning

, Article Desalination and Water Treatment ; Volume 57, Issue 26 , 2016 , Pages 12090-12098 ; 19443994 (ISSN) Anvari, A ; Safekordi, A ; Hemmati, M ; Rekabdar, F ; Tavakolmoghadam, M ; Azimi Yancheshme, A ; Gheshlaghi, A ; Sharif University of Technology

Taylor and Francis Inc 2016

Abstract

Ultrafiltration (UF) membranes were prepared from blends of poly(vinylidene fluoride) (PVDF)/polyacrylonitrile (PAN) via phase inversion method induced by immersion precipitation. Polyvinylpyrrolidone (PVP) was used as pore former and hydrophilic polymeric additive. N,N-dimethylacetamide (DMAc) and water were used as solvent and coagulant (non-solvent), respectively. The effect of different concentrations of PVP on the morphology and performance of the prepared membranes was investigated. Performance of the membranes was evaluated based on pure water flux and filtration of buffered bovine serum albumin (BSA) solution. The contact angle measurements indicated that the hydrophilicity of...