Hassan Sawalha

Hassan Sawalha
Palestine Polytechnic University · Department of Mechanical Engineering

PhD

About

44
Publications
16,628
Reads
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694
Citations
Citations since 2016
15 Research Items
461 Citations
2016201720182019202020212022020406080100
2016201720182019202020212022020406080100
2016201720182019202020212022020406080100
2016201720182019202020212022020406080100
Additional affiliations
July 2013 - January 2015
An-Najah National University
Position
  • Head of Department
April 2005 - April 2009
Wageningen University & Research
Position
  • Researcher

Publications

Publications (44)
Article
Full-text available
The objective of this study is to investigate the effect of addition of various types of emulsifiers on the morph/ology and thermal and mechanical and properties of organogels. For the preparation of the organogels, γ‐oryzanol and β‐sitosterol mixed at 60:40 w/w ratio were dissolved in decane containing various types of emulsifiers, including Span...
Article
Full-text available
The main aim of this study was to perform a parametric study for treating a model dye containing wastewater (i.e., methylene blue, MB) using locally available biomass wastes in Palestine as the adsorbent. Eight different types of biomasses were investigated in batch adsorption tests, including coffee grains, almond shells, pistachio shells, date pi...
Article
Full-text available
Rapid population growth and urbanization are two main drivers for the over-abstraction of conventional freshwater resources in various parts of the world, which leads to the situation of water scarcity (per capita availability <1000 m3/year). Predictions based on the World Bank projected population data and the FAO AQUASTAT database for freshwater...
Article
The main aim of this research is to review and analyze the requirements for plastic materials that come into contact with food (and water), with a particular emphasis on the restricted substance list (RSL) for plastic containers used for storing water (and food). In addition, at the international and regional levels, chemical regulations, allowable...
Article
The main aim of this review was to provide insights on the possible cleaner production (CP) options for leather manufacturing industries and propose suitable resource recovery technologies. A real case study from local tanneries in Palestine has been presented. All the processes involved in the leather tannery industry have been reviewed based on r...
Article
Full-text available
The present study investigates the effect of oil type on the formation, morphology and mechanical properties of phytosterol-based organogels. The formation of organogels can be satisfactorily predicted with a criterion based on Hansen Solubility Parameters (HSPs), provided that the sterol and sterol ester in these systems assemble as tubules. When...
Article
Full-text available
The main aim of this study was to remove hydrogen sulfide (H2S) from biogas by adsorption using synthesized activated carbon prepared using locally available biomass. The effect of the type of precursors, impregnation reagent and bed height was studied in continuous reactors. Three types of biomass wastes (almond shells, eucalyptus and coffee grain...
Conference Paper
Full-text available
Cleaner production (CP) options for leather manufacturing in Hebron, Palestine, are evaluated for the purpose of examining the potential adoption of the identified CP options. The approach was descriptive combined with field and laboratory testing. Field visits and sampling from six factories were the primary data sources. All processes in the inve...
Conference Paper
Full-text available
The present study aims determining the pollution loads from the wastewater (WW) released from the leather tanning industry in Palestine. WW samples were collected from all leather manufacturing processes from seven tanneries located in Hebron, Palestine. The physicochemical characteristics of the WW including, chemical oxygen demand (COD), total so...
Chapter
Tannery industries are one of the heaviest polluting industries in the world due to critical environmental problems resulting from wastewater containing heavy metals and high chemical oxygen demand. Tanneries, especially in developing countries, are still being operated by conventional production methods and most of the existing tanneries do not fo...
Article
Leather manufacturing industry has major environmental impacts. Characterization of tannery's wastewater (WW) is a key step in the management of wastewater released from various processes. This study presents some physicochemical characteristics measured in wastewater. It compares the pollution loads released from both goat and cow hides processing...
Article
Full-text available
The conclusion and recommendations from this special issue on water challenges in Palestine were drawn by the 4 editors of this special issue according to the following thematic research topics: 1 water resources in Palestine, particularly the West Bank 2 water issues in Gaza 3 drinking water issues 4 water governance assessments 5 pollution issues...
Article
Carvedilol poly(d,l)-lactide nanoparticles/microparticles were prepared. The size and morphology of the developed particles were optimized to study the carvedilol release profile by studying the effect of organic solvents and polymer amount through atomic force microscopy analysis. Spherical particles were obtained with a minimum size of 125 nm in...
Article
Core–shell polymer microcapsules are well known for their biomedical applications as drug carriers when they are filled with drugs and gas-filled microcapsules that can be used as ultrasound contrast agents. The properties of microcapsules are strongly dependent on their size (distribution); therefore, equipment that allows the preparation of small...
Article
Full-text available
Galvanization industry generates wastewater that is mainly contaminated with heavy metals. There are more than 20 galvanization plants in Palestine that discharge their wastewater into local environment or sewer system without any proper treatment. This study aims at characterizing wastewater generated from galvanization industry to identify the ma...
Article
Full-text available
The phase behavior of binary mixtures of γ-oryzanol and β-sitosterol and ternary mixtures of γ-oryzanol and β-sitosterol in sunflower oil was studied. Binary mixtures of γ-oryzanol and β-sitosterol show double-eutectic behavior. Complex phase behavior with two intermediate mixed solid phases was derived from differential scanning calorimetry (DSC)...
Article
Full-text available
The present study aims at studying the possibility of compounding polyethylene using stone cutting solid waste (lime stone powder). Stone cutting waste powder (SCWP) mainly consists of calcium carbonate is usually disposed in open fields, roadside, sewage and agricultural land leading to several environmental and health problems. Samples of SCWP we...
Article
Mixtures of γ-oryzanol and β-sitosterol were used to structure different oils (decane, limonene, sunflower oil, castor oil, and eugenol). The γ-oryzanol and β-sitosterol mixtures self-assemble into double-walled hollow tubules (∼10 nm in diameter) in the oil phase, which aggregate to form a network resulting in firm organogels. The self-assembly of...
Article
Full-text available
We report that the stability of an aqueous food grade fibril system upon pH change is affected by the presence of peptides that are formed during the process of fibril formation. We discuss several other relationships between food relevant properties and nano-scale characteristics, and compare these relationships for aqueous fibril systems to those...
Article
Full-text available
Small-angle neutron scattering (SANS) experiments have been performed on self-assembled tubules of sitosterol and oryzanol in triglyceride oils to investigate details of their structure. Alternative organic phases (deuterated and non-deuterated decane, limonene, castor oil and eugenol) were used to both vary the contrast with respect to the tubules...
Article
In this study, water-in-oil emulsions were prepared from water containing different salt concentrations dispersed in an oil phase containing a mixture of β-sitosterol and γ-oryzanol. In pure oil, the β-sitosterol and γ-oryzanol molecules self-assemble into tubular microstructures to produce a firm organogel. However, in the emulsion, the water mole...
Article
In this study, w/o-emulsions were prepared from water containing different salt concentrations dispersed in an oil phase containing mixture of β-sitosterol and γ-oryzanol. In pure oil the β-sitosterol and γ-oryzanol molecules self-assemble into tubular microstructures to produce a firm organogel. However, in the emulsion the water molecules bind to...
Article
Water-in-oil emulsions were prepared, structured only by a mixture of sitosterol and oryzanol and without further emulsifiers, containing 16 and 32% total sterol(esters)s on lipid phase and 10, 30 or 60% water. Previously, mixtures of β-sitosterol + γ-oryzanol were shown to form self-assembled tubules in triglyceride oil with diameter 7.2 ± 0.1 nm...
Article
Full-text available
The gelation process of mixtures of γ-oryzanol and sitosterol structurants in sunflower oil was studied using light scattering, rheology, and micro-scanning calorimetry (Micro-DSC). The relation between temperature and the critical aggregation concentration (CAC) of tubule formation of γ-oryzanol and sitosterol was determined using these techniques...
Article
Poly(L-lactide) (PLLA) films exhibit toughening by the addition of oils to the polymer casting. This was investigated by casting films from solution and evaporation in air; the investigated oils were linear alkanes, cyclic alkanes, and two terpenes (limonene and eugenol). The addition of the oils greatly influenced the morphology and thermal and me...
Article
Hollow polylactide microcapsules were prepared by multistage premix membrane emulsification of polylactide/dichloromethane/oil solutions in water (nonsolvent). The effects of the different oils on the morphology, thermal, and mechanical properties of the hollow microcapsules were investigated. All oils resulted in hollow microcapsules with controll...
Article
This thesis aims at preparation of hollow polylactide (PLA) microcapsules for use as ultrasound contrast agents with controlled size, structure and mechanical and thermal properties. The microcapsules were prepared with multistage premix membrane emulsification. The mechanical and thermal properties of the microcapsules, and of films that were prep...
Article
Full-text available
Hollow polylactide microcapsules that can be used as ultrasound contrast agents were prepared using premix membrane emulsification. Polylactide/dichloromethane and dodecane solutions were emulsified together with a nonsolvent phase (water or a water–alcohol mixture) by repeated passage through a glass fibre membrane. The solvent, dichloromethane, d...
Article
Full-text available
Polylactide microspheres were prepared by pre-mix membrane emulsification and subsequent extraction of solvent in a coagulation bath, and ultimately to the gas phase. The polymer was dissolved in dichloromethane and emulsified with water or water–methanol mixtures by repeated passage through a glass membrane. During and after emulsification, the dr...
Article
In this study, the strength, ductility, and porosity of polylactide films prepared by immersion precipitation and film casting in air were investigated. To induce extra porosity in the films, dodecane was added to the polymer casting solution. The structure, porosity, and mechanical properties of the films were evaluated. The ultimate strength and...
Article
Full-text available
The influence of nonsolvent, crystallinity of the polymer film, and addition of dodecane (a poor solvent for the polymer and for the nonsolvent) on the morphology of polylactides films has been investigated and was related to phase separation behavior. Both amorphous poly-DL-lactide (PDLLA) and crystalline poly-L-lactide (PLLA) were dissolved in di...
Conference Paper
Full-text available
This paper evaluates the level of environmental impact of olive oil production in Palestine. The paper methodology is based on conducting a local survey; after designing a questionnaire covering the basic aspects of the paper which included oil production yield, water consumptions in olive washing and in oil recovery, wastewater generation relative...
Conference Paper
Full-text available
This paper aimed at evaluating flocculation-Sedimentation process (FSP) used in local stone cutting plants in Palestine. A pilot plant was built by scaling down the existing industrial FSP. The effects of various design and operating parameters on the flow field in the sedimentation vessel, and particle separation efficiency were investigated exper...
Conference Paper
Full-text available
The aim of this study was to evaluate the existing industrial Flocculation-Sedimentation Process through building pilot scale device simulating the industrial process. The effect of design and operating parameters on separation efficiency was then investigated experimentally.
Article
Water-in-oil emulsions were prepared, structured only by a mixture of sitosterol and oryzanol and without further emulsifiers, containing 16 and 32% total sterol(esters)s on lipid phase and 10, 30 or 60% water. Previously, mixtures of β-sitosterol + γ-oryzanol were shown to form self-assembled tubules in triglyceride oil with diameter 7.2 ± 0.1 nm...

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Projects

Project (1)
Project
Managing heavy metals contaminated industrial wastewater from inorganic chemical industries: Implementing cleaner production for sustainability