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Microstructure-Property Relationship In The Thermomechanically Processed C-Mn-Si-Nb-Al-(Mo) Transformation-Induced Plasticity Steels Before And After Prestraining And Bake Hardening Treatment, I B. Timokhina, M Enomoto, M K. Miller, E V. Pereloma
Microstructure-Property Relationship In The Thermomechanically Processed C-Mn-Si-Nb-Al-(Mo) Transformation-Induced Plasticity Steels Before And After Prestraining And Bake Hardening Treatment, I B. Timokhina, M Enomoto, M K. Miller, E V. Pereloma
Faculty of Engineering - Papers (Archive)
The effect of prestraining and bake hardening (PS/BH) on the development of microstructures and mechanical properties in thermomechanically processed transformation-induced plasticity (TRIP) steels with additions of Nb, Mo, and Al was studied by atom probe tomography (APT) and transmission electron microscopy (TEM). An increase in number density and sizes of clusters and nanoscale precipitates was observed in both steels but was more significant in the Nb-Al-Mo steel than in the Nb-Al steel. This increase could be explained by the possible fast diffusion of Nb and Mo atoms at low temperatures, as was observed for surface diffusivity. The contributions of cluster …
Armouring By Precipitates And The Associated Reduction In Hydraulic Conductivity Of Recycled Concrete Aggregates Used In A Novel Prb For The Treatment Of Acidic Groundwater, Punyama Pathirage, Buddhima Indraratna, Long Duc Nghiem, Laura Banasiak, Gyanendra Regmi
Armouring By Precipitates And The Associated Reduction In Hydraulic Conductivity Of Recycled Concrete Aggregates Used In A Novel Prb For The Treatment Of Acidic Groundwater, Punyama Pathirage, Buddhima Indraratna, Long Duc Nghiem, Laura Banasiak, Gyanendra Regmi
Faculty of Engineering - Papers (Archive)
Acidic groundwater generated from acid sulphate soil (ASS) is a major geo-environmental problem in Australia. A permeable reactive barrier (PRB) with recycled concrete aggregates as the reactive material has received considerable attention as an innovative, cost effective technology for passive treatment of acidic groundwater in ASS terrain. Laboratory column experiments conducted at the University of Wollongong investigated the acid neutralisation behaviour of recycled concrete and its potential to remove dissolved aluminium (Al) and iron (Fe). The recycled concrete effectively treated the acidic groundwater, resulting in near-neutral effluent pH and complete removal of Al and Fe. However, armouring of the concrete …
Treatment Of Acidic Groundwater In Acid Sulfate Soil Terrain Using Recycled Concrete: Column Experiments, Gyanendra Regmi, Buddhima Indraratna, Long Nghiem, A. Golab, B Guru Prasad
Treatment Of Acidic Groundwater In Acid Sulfate Soil Terrain Using Recycled Concrete: Column Experiments, Gyanendra Regmi, Buddhima Indraratna, Long Nghiem, A. Golab, B Guru Prasad
Faculty of Engineering - Papers (Archive)
Acidic groundwater generated from pyrite oxidation in acid sulfate (AS) soil is a major geoenvironmental problem in Australia. This study aims to evaluate recycled concrete as a reactive material in permeable reactive barriers (PRBs) for the remediation of acidic groundwater in low-lying AS soil floodplains. Laboratory experiments were systematically conducted to investigate the acid neutralization behavior of recycled concrete and its potential to remove dissolved Al and Fe. The results confirmed that recycled concrete could effectively treat acidic groundwater from an AS soil terrain, resulting in near neutral effluent over a long period with complete removal of Al and Fe. …
A Real-Time Measuring Technology For Studying Distortion Of Hydraulic Turbine Blade Castings During Heat Treatment Process, Hailiang Yu, Jinwu Kang, Gang Nie, Haimin Long, Xiaokun Hao, Tianyou Huang
A Real-Time Measuring Technology For Studying Distortion Of Hydraulic Turbine Blade Castings During Heat Treatment Process, Hailiang Yu, Jinwu Kang, Gang Nie, Haimin Long, Xiaokun Hao, Tianyou Huang
Faculty of Engineering - Papers (Archive)
During heat treatment process, the distortion behavior inevitably appears in hydraulic turbine blade castings. In this research, a technology was developed for real-time measurement of the distortion in hydraulic turbine blade castings at the still air cooling and forced air cooling stages during heat treatment process. The method was used to measure the distortion behavior at the cooling stages in both normalizing and tempering processes. At the normalization, the distortion at the blade corner near outlet side undergoes four stages with alternating bending along positive and negative directions. At the tempering stage, the distortion could be divided into two steps. …
Roadside Rest Area Wastewater Treatment System: Performance Evaluation And Improvement, Adam Kiss, Faisal I. Hai, Long Nghiem
Roadside Rest Area Wastewater Treatment System: Performance Evaluation And Improvement, Adam Kiss, Faisal I. Hai, Long Nghiem
Faculty of Engineering - Papers (Archive)
The performance of a decentralised sewage treatment plant located at a rest area servicing a major freeway was investigated. Long term monitoring and rigorous analyses undertaken in this study revealed several unique and challenging issues associated with such scarcely studied systems. Data collected over a six month period showed that the raw wastewater strength was well above typical household wastewater characteristics, with the average BOD5, COD, TOC, TN and TP values of 880, 4900, 350, 238 and 8 mg/L, respectively. The system performance was considerably lower than that expected of a typical wastewater treatment unit. Several shortcomings in …
Treatment Of Saline Aqueous Solutions Using Direct Contact Membrane Distillation, Long Nghiem, Florian Hildinger, Faisal I. Hai, Tzahi Cath
Treatment Of Saline Aqueous Solutions Using Direct Contact Membrane Distillation, Long Nghiem, Florian Hildinger, Faisal I. Hai, Tzahi Cath
Faculty of Engineering - Papers (Archive)
The treatment of highly saline aqueous solutions using direct contact membrane distillation (DCMD) was evaluated in this study. Experiments were conducted using a flat sheet polytetrafluoroethylene membrane with nominal pore size of 0.22 µm. Seawater, reverse osmosis (RO) concentrate collected from a wastewater reclamation plant, and a synthetic solution containing 2,000 mg/L of CaSO4 were selected as the representative saline solutions. A gradual decline in permeate flux was observed at the beginning of the experiments when the seawater and RO concentrate solutions were treated using the DCMD process, most likely due to initial organic fouling and scaling. In contrast, …
Treatment Of High Tds Liquid Waste: Is Zero Liquid Discharge Feasible?, Alexander Robertson, Long Nghiem
Treatment Of High Tds Liquid Waste: Is Zero Liquid Discharge Feasible?, Alexander Robertson, Long Nghiem
Faculty of Engineering - Papers (Archive)
A zero liquid discharge treatment system for the disposal of saline industrial liquid waste was proposed and evaluated in this study. Microfiltration was selected as a pretreatment process after a qualitative assessment against `conventional¿ options. Two reverse osmosis (RO) membranes were examined for the pre-concentration of liquid waste using a laboratory scale membrane rig. The results were used to validate the use of the ROSA simulation package. ROSA simulation was conducted with liquid waste having a range of salinity of up to 100,000 ppm of total dissolved solid (TDS). Results reported here indicated that RO membranes were highly suitable for …
Evaluating Waste Concrete For The Treatment Of Acid Sulphate Soil Groundwater From Coastal Floodplains, Gyanendra Regmi, Buddhima Indraratna, Long Nghiem, Laura Banasiak
Evaluating Waste Concrete For The Treatment Of Acid Sulphate Soil Groundwater From Coastal Floodplains, Gyanendra Regmi, Buddhima Indraratna, Long Nghiem, Laura Banasiak
Faculty of Engineering - Papers (Archive)
The treatment of acidic groundwater generated from acid sulphate soil (ASS) terrain is a challenging environmental issue in coastal floodplains of Australia. In this study, a laboratory column experiment was conducted to assess the performance of waste concrete for treating the acidic groundwater leachate from ASS terrain of the Shoalhaven region of NSW. The groundwater was highly acidic (pH of 2.5–3.5) and contained elevated concentrations of iron (10–90 mg/L) and aluminium (30–45 mg/L). Passage of the acidic groundwater through the column filled with waste concrete resulted in a significant improvement in water quality. Reduction in the concentration of iron and …
Is Halogen Content The Most Important Factor In The Removal Of Halogenated Trace Organics By Mbr Treatment?, Faisal I. Hai, Nichanan Tadkaew, James A. Mcdonald, Stuart J. Khan, Long Nghiem
Is Halogen Content The Most Important Factor In The Removal Of Halogenated Trace Organics By Mbr Treatment?, Faisal I. Hai, Nichanan Tadkaew, James A. Mcdonald, Stuart J. Khan, Long Nghiem
Faculty of Engineering - Papers (Archive)
Incorporating Sustainable Practice in Mechanics of Structures and Materials covers a wide range of topics, from composite structures, via fire engineering and masonry structures, to timber engineering. Valuable reference for academics, researchers and practicing engineers working in structural engineering and structural mechanics. Summary Incorporating Sustainable Practice in Mechanics of Structures and Materials is a collection of peer-reviewed papers presented at the 21st Australasian Conference on the Mechanics of Structures and Materials (ACMSM21, Victoria, University, Melbourne, Australia, 7th – 10th of December 2010). The contributions from academics, researchers and practicing engineers from 17 countries, mainly from Australasia and the Asia-pacific region, …
Removal Of Trace Organics By Mbr Treatment: The Role Of Molecular Properties, Nichanan Tadkaew, Faisal I. Hai, James A. Mcdonald, Stuart J. Khan, Long Nghiem
Removal Of Trace Organics By Mbr Treatment: The Role Of Molecular Properties, Nichanan Tadkaew, Faisal I. Hai, James A. Mcdonald, Stuart J. Khan, Long Nghiem
Faculty of Engineering - Papers (Archive)
This study examined the relationship between specific molecular features of trace organic contaminants and their removal efficiencies by a laboratory scale membrane bioreactor (MBR). Removal efficiencies of 40 trace organic compounds were assessed under stable operating conditions. The reported results demonstrate an apparent correlation between chemical structures and the removal of trace organic contaminants by the laboratory scale MBR system. The removal of all 14 very hydrophobic (Log D > 3.2) trace organic compounds selected in this study was consistently high and was above 85%. The occurrence and types of electron withdrawing or donating functional groups appear to be important factors …
Influence Of Heat Treatment On Superconductivity Of Mgb2 Bulk Sintered In Flowing Welding Grade Ar Atmosphere, Yun Zhang, Cheng Lu, Sihai Zhou, K. C. Chung, Y. K. Kim, S. X. Dou
Influence Of Heat Treatment On Superconductivity Of Mgb2 Bulk Sintered In Flowing Welding Grade Ar Atmosphere, Yun Zhang, Cheng Lu, Sihai Zhou, K. C. Chung, Y. K. Kim, S. X. Dou
Faculty of Engineering - Papers (Archive)
In this paper, MgB2 samples were sintered in flowing welding grade Ar. The effect of the sintering time varying from 10 minutes to 3 hours on superconductivity of MgB2 has been investigated. It has been found that both Hc2 and Hirr increase with the sintering time and they have linear relationships with microstrain. The sample sintered for 30 min exhibits the highest Jc at high fields. The reason can be attributed to the improved connectivity and the increased Hc2.
Mathematical Model To Predict Solids Content Of Water Treatment Residuals During Drying, Ali Gharaibeh, Muttucumaru Sivakumar, Dharmappa Hagare
Mathematical Model To Predict Solids Content Of Water Treatment Residuals During Drying, Ali Gharaibeh, Muttucumaru Sivakumar, Dharmappa Hagare
Faculty of Engineering - Papers (Archive)
Dewatering and drying of residuals are extremely energy intensive processes, which are necessary to reduce the quantity of wet residuals produced from the water and wastewater treatment operations. Meteorological conditions are a major factor in the drying of residuals, which can greatly affect the drying period. A mathematical model is developed for the process of drying of water treatment residuals. A steady-state heat-balance equation is applied for a control volume of residuals that takes into account the heat transfer by radiation, convection, and evaporation. The mathematical model was validated using drying experiments conducted in a wind tunnel as well as …
Dairy Shed Wastewater Treatment By Anaerobic Digestion Technology, Ling Tie, Muttucumaru Sivakumar
Dairy Shed Wastewater Treatment By Anaerobic Digestion Technology, Ling Tie, Muttucumaru Sivakumar
Faculty of Engineering - Papers (Archive)
Continued growth and consolidation of the livestock industry such as dairy industry has generated large-quantities and high-strength manure, which has long been identified as a major contributor to diffuse source pollution in Australia. However, conventional dairy shed wastewater treatment practices in Australia such as two pond systems still do not provide sufficient treatment. In addition, relevant laws and regulations in terms of nutrient management plans and manure solids disposal require new waste management approaches. Anaerobic digestion (AD) is an efficient, small footprint, cost effective and sustainable technology that should be applied in Australian dairy farms, and has the potential not …
The Application Of Linear Elastic Fracture Mechanics To Optimize The Vacuum Heat Treatment And Nitriding Of Hot-Work Tool Steels, V. Leskovsek, Borivoj Sustarsic, David J. Nolan
The Application Of Linear Elastic Fracture Mechanics To Optimize The Vacuum Heat Treatment And Nitriding Of Hot-Work Tool Steels, V. Leskovsek, Borivoj Sustarsic, David J. Nolan
Faculty of Engineering - Papers (Archive)
Linear elastic fracture mechanics was used to optimise the vacuum-heat-treatment procedures for conventional hot-work AISIHII tool steel. The fracture toughness was determined with non-standard, circumferetially notched and fatigue-precracked tensile-test specimens.
Membrane Bioreactor Technology For Decentralised Wastewater Treatment, Nichanan Tadkaew, Long Nghiem, Muttucumaru Sivakumar
Membrane Bioreactor Technology For Decentralised Wastewater Treatment, Nichanan Tadkaew, Long Nghiem, Muttucumaru Sivakumar
Faculty of Engineering - Papers (Archive)
Driven by stricter environmental regulations and legalisation on wastewater discharge and shrinking fresh water resources, water treatment has become an area of significant concern while at the same time there is a growing interest in utilising non-traditional water resources by means of water reclamation and water recycling.
Drying Of Water Treatment Plant Residuals, Ali Mohammad Gharaibeh, Muttucumaru Sivakumar, Hagare Dharmappa
Drying Of Water Treatment Plant Residuals, Ali Mohammad Gharaibeh, Muttucumaru Sivakumar, Hagare Dharmappa
Faculty of Engineering - Papers (Archive)
Drying of ferric chloride water treatment plant residuals have been studied in two experimental sand drying beds. One bed was open and the other was covered with glass to study respectively the open bed drying of residuals under normal weather conditions and passive solar energy drying. The covered bed was fabricated, with a view, to simulate the solar distillation stills. A weather station was used to monitor the dynamic weather conditions in order to study their effect on the drying process. Solids content, drainage water volumes and distillate from the covered bed were measured on a daily basis. The aim …