Huzairy Hassan
Thumbnail Image
Preferred name
Huzairy Hassan
Official Name
Hassan, Huzairy
Alternative Name
Hassan, H.
Hassan, Huzairy
Main Affiliation
Scopus Author ID
55389539900
Researcher ID
GYR-0674-2022

Research Output

Filters

14
Reset filters

Settings
Now showing 1 - 10 of 14
Thumbnail Image
Publication

Utilization of agricultural by-products for alpha-amylase production under solid state fermentation by Bacillus subtilis

2012-08-18 , Huzairy Hassan , Khairiah Abd Karim

The production of alpha-amylase by Bacillus subtilis was investigated under different cultivation conditions on two different solid substrates as the support, i.e. oil palm empty fruit bunch (OPEFB) fibers and rice straw using solid state fermentation (SSF) process. Both solid substrates were first pre-treated using NaOH to remove lignin and silica and to break down the hemicellulose structures. The influences of incubation time, incubation temperature and the additional carbon and nitrogen sources on the production of alpha-amylase by B. subtilis were investigated. After 48 h of incubation, the highest enzyme activities were obtained at 39.9 U/g and 23.5 U/g for rice straw and OPEFB fibers, respectively. The optimum temperature for alpha-amylase production was observed at 45°C for the OPEFB fibers and 55°C for the rice straw. Among the defined carbohydrates, the addition of glucose (0.02 g/g dry substrate) has significantly improved the production of alpha-amylase. Similar effect was observed when yeast extract (0.01 g/g dry substrate) was supplemented as the additional nitrogen source. Rice straw appeared to be the best solid substrate in producing alpha-amylase (276 U/g) in SSF under these optimum cultivation conditions.

View
Thumbnail Image
Publication

Chloramphenicol and methylene blue adsorption by modestly treated paper sewage sludge-based activated carbon

2023-12-01 , Aziz A. , Huzairy Hassan , Ahmad M.A.

Refractory pollutants like pharmaceuticals and dyes have become excessively prevalent in most Malaysian water bodies because of the growing textile and pharmaceutical industries. Hence, this work employed activated carbon prepared from freely available paper mill sewage sludge for removing chloramphenicol (CAP) and methylene blue (MB). Modest treatment of low-temperature carbonisation assisted with a short activation time of microwave radiation had been used. Analysis of variance of central composite design resulted in the optimum conditions of 440-W radiation power and 3-min activation time for optimum removal of 70% CAP and 51% MB. The surface area of the paper mill sewage sludge activated carbon (PMSSAC) improved greatly from 1.14 to 412 m2/g, with the highest adsorption capacity of 13 mg/g. The scanning electron microscope images demonstrated the efficiency of microwave radiation treatment, where more cavities and pores were observed on activated carbon for improved adsorbate penetration. The Freundlich isotherm and the pseudo-second-order model appeared to best fit the kinetic data. Furthermore, the high affinity of adsorbate towards the PMSSAC surface could be the plausible mechanism, as indicated by the high amount of adsorption within the initial stage of adsorption. Thus, it is envisaged that our PMSSAC could be effectively employed in actual wastewater systems, as evidenced by excellent CAP and MB removal. Graphical abstract: [Figure not available: see fulltext.]

View
Thumbnail Image
Publication

Application of OPEFB fibre based electrode in microbial fuel cell system for electricity generation and chlorophenol degradation

2021-05-24 , Raudzah Mohd Zahir , Huzairy Hassan , Ahmad Anas Nagoor Gunny

Microbial fuel cell (MFC) has emerged as one of the potential technologies for sustainable bioelectrical energy recovery and reduction of recalcitrant wastes. The MFC performance is greatly influenced by the anode materials which serve as the support for exoelectrogenic bacteria attachment. In this study, oil palm empty fruit bunch (OPEFB) is proposed as an alternative anode material prepared via a direct carbonization process using tube furnace owing to its good conductivity property. The carbonization process was conducted under nitrogen gas flow at 900℃ with a constant heating rate of 5℃/min. The anode was prepared by mixing the carbonized OPEFB with polytetrafluoroethylene (PTFE) binder. When used in MFC, the OPEFB-anode generated a maximum current density of 97.30 mA/m2, which is comparatively higher than that of the conventional carbon cloth anode (76.24 mA/m2). Our MFC system had also resulted considerable chemical oxygen demand (COD) and 2-chlorophenol reductions of 77% and 75%, respectively. This study could support future research on freely-available OPEFB materials for high performance MFC anode.

View
Thumbnail Image
Publication

Carbonized chilli stalk adsorbent to remove methylene blue dye from aqueous solution: Equilibrium and kinetics studies

2021-05-24 , Aziz A. , Huzairy Hassan , Yahaya N.K.E.M. , Karim J. , Ahmad M.A. , Karim K.A.

The fast growth of textile industry has led to afflictive water pollution problems. The discharge of dyes into the environment poses health threats to the ecosystem due to their carcinogenicity and mutagenicity. Adsorption process is among the most utilized approach in treating textile wastewater. Chilli stalk which is abundantly available as agrowaste was transformed into adsorbent through carbonization process at various temperatures for the adsorption of methylene blue (MB). Dye batch adsorption studies were conducted to evaluate the effects of initial dye concentration (25 – 300 mg/L), contact time (0 – 24 hours) and carbonization temperature (350 - 400 °C). The surface characteristics, proximate and elemental analyses, surface morphology and chemistry were studied on both chilli stalk (CS) and carbonized chilli stalk adsorbent (CCSA). The maximum MB dye removal was 97.04% at 400 °C of carbonization temperature. The data fitted Freundlich isotherm model and pseudo-second-order kinetic model for adsorption equilibrium and kinetic studies, respectively.

View
Thumbnail Image
Publication

Current status on Microbial Fuel Cell (MFC) technology

2022-01-01 , Huzairy Hassan , Raudzah Mohd Zahir , Ahmad M.A. , Mismisuraya Meor Ahmad

Agricultural and industrial activities in Malaysia have adversely impacted environmental quality leading local researchers to mobilize their expertise and resources to protect the environment from this alarming situation. The palm oil industry, for instance, generates an abundance of wastes (such as palm oil mill effluent [POME]), which calls for effective technological tools to reduce these recalcitrant wastes from spreading further. Microbial fuel cell (MFC) is an emerging technology for wastewater treatment and electricity generation simultaneously, which appears to be the most advantageous solution for these environmental concerns. This chapter reviews the prospects of MFC research with a special emphasis on the current MFC status in Malaysia. It begins with an overview of MFC principles, electron transfer mechanisms, and bio-electrochemical performance. Following that, a review of the recent MFC developments and activities by Malaysian researchers is discussed with an emphasis on POME utilization. This chapter concludes with several resolutions to the main challenges researchers and scientists are facing regarding the scalability of MFC for electricity recovery and wastewater treatment.

View
Thumbnail Image
Publication

Dual-response quadratic model for optimisation of electricity generation and chlorophenol degradation by electro-degradative Bacillus subtilis in microbial fuel cell system

2022-01-01 , Huzairy Hassan , Jin B. , Dai S.

The interactions within microbial, chemical and electronic elements in microbial fuel cell (MFC) system can be crucial for its bio-electrochemical activities and overall performance. Therefore, this study explored polynomial models by response surface methodology (RSM) to better understand interactions among anode pH, cathode pH and inoculum size for optimising MFC system for generation of electricity and degradation of 2,4-dichlorophenol. A statistical central composite design by RSM was used to develop the quadratic model designs. The optimised parameters were determined and evaluated by statistical results and the best MFC systematic outcomes in terms of current generation and chlorophenol degradation. Statistical results revealed that the optimum current density of 106 mA/m2 could be achieved at anode pH 7.5, cathode pH 6.3–6.6 and 21–28% for inoculum size. Anode–cathode pHs interaction was found to positively influence the current generation through extracellular electron transfer mechanism. The phenolic degradation was found to have lower response using these three parameter interactions. Only inoculum size-cathode pH interaction appeared to be significant where the optimum predicted phenolic degradation could be attained at pH 7.6 for cathode pH and 29.6% for inoculum size.

View
Thumbnail Image
Publication

Methylene blue dye removal using Parkia speciosa pod based activated carbon

2021-05-24 , Aziz A. , Huzairy Hassan , Yahaya N.K.E.M. , Karim J. , Ahmad M.A.

Critical environmental issues have emerged from wastewater of industrial textile effluent discharge which consists of refractory dyes. Effective methods such as activated carbon (AC) adsorption is extremely demanded for solving this environmental pollution. In this study, low-cost AC was developed from Parkia speciosa pods (PSP) using microwave-assisted activation technique for the methylene blue (MB) dye adsorption. Optimization on activating conditions in terms of MB removal and AC yield was performed using response surface methodology (RSM). The optimum microwave irradiation power (MIP) of 416.50 W was found to have significant effect on MB removal at 2 minutes activation. The Parkia speciosa pods activated carbon (PSPAC) possessed intermediate surface area and total pore volume of 51.3 m2/g and 0.0681 cm3/g, respectively. PSPAC surface morphology was microscopically observed with highly porous structure indicating characteristics of good AC. Batch adsorption studies with various initial concentrations discovered that MB adsorption increased with increasing initial concentrations and contact time. The experimental data was in close fit using Langmuir isotherm and followed pseudo-first-order kinetic models. The MB dye adsorption process was governed by simultaneous surface adsorption and intraparticle diffusion. The results of studies proved that PSPAC is a potential adsorbent for dye-contaminated wastewater.

View
Thumbnail Image
Publication

Effect of photodegradation on chemical characteristics and enzymatic digestibility of chicken feather keratin

2024-03-21 , Aziz F. , Zarina Zakaria , Syazwani Mahmad Puzi , Huzairy Hassan

The rapid development of poultry industry has correlated with increased production of keratin containing wastes that possessed complex morphology which difficult to degrade. UV irradiation pretreatment provide an initial stage of degradation before they are further degrade using fermentation process into ready to use protein. Untreated and treated with UV light chicken feathers morphology of fibers and cuticle cells were observed using SEM. A feather protein hydrolysate was produced by keratinolytic bacteria Bacillus subtilis under submerged fermentation. Keratinolytic kinetic is study using Michealis-Menten kinetics where Km value for treated chicken feathers with UV was 22.4591 M which is smaller compare to untreated chicken feathers, 42.3065 M. The smaller Km value shows tightly binding of keratinase and chicken feathers powder. Chicken feathers that were treated with UVC has the highest protein content about 3.19 mg/mL of protein while untreated chicken feathers only contains 2.29 mg/mL of protein.

View
Thumbnail Image
Publication

Optimization of chlorophenols adsorption using OPEFB biosorbent

2022-11-18 , Huzairy Hassan , Mohd Azmier Ahmad , Lim Chia Hooi , Bello Olugbenga Solomon

Palm oil industry have long been one of the most important economic drivers in the country. However, the abundance of wastes generated such as oil palm empty fruit bunch (OPEFB) and palm oil mill effluent (POME) have resulted in serious environmental issues that necessitate immediate response. This work investigates the optimization of biosorption of chlorophenols, which are commonly found in POME, using treated OPEFB biosorbent. The surface of biosorbent was modified by physical or chemical treatment. The biosorption capacity for 2,3-dichlorophenol (2,3-DCP) are higher than that of 2-chlorophenol (2-CP). Therefore, 2,3-DCP was further examined in the optimization study by Full 2k factorial design and Central Composite Design (CCD). A full 25-1 factorial design with five factors and two levels was used to screen the significant factors that influenced the biosorption process. These results were applied in the optimization using CCD with three factors (initial 2,3-DCP concentration, pH of solution and OPEFB biosorbent dosage). It is found the optimum conditions for 2,3-DCP biosorption were 200?ppm initial concentration, pH 5 and 0.15?g dosage. The maximum biosorption capacity was 13.65?mg/g. Langmuir biosorption isotherm best described the biosorption of 2,3-DCP onto OPEFB biosorbent at different initial concentrations of 2,3-DCP solution. Pseudo-second order was found to best fit the biosorption system by OPEFB biosorbent. Therefore, it is worth considering the potential use of OPEFB biomass as a biosorbent in the application of the treatment of toxic pollutants.

View
Thumbnail Image
Publication

Utilization of agricultural by-products for alpha-amylase production under solid state fermentation by bacillus subtilis

2012 , Huzairy Hassan , Khairiah Abd Karim

The production of alpha-amylase by Bacillus subtilis was investigated under different cultivation conditions on two different solid substrates as the support, i.e. oil palm empty fruit bunch (OPEFB) fibers and rice straw using solid state fermentation (SSF) process. Both solid substrates were first pre-treated using NaOH to remove lignin and silica and to break down the hemicellulose structures. The influences of incubation time, incubation temperature and the additional carbon and nitrogen sources on the production of alpha-amylase by B. subtilis were investigated. After 48 h of incubation, the highest enzyme activities were obtained at 39.9 U/g and 23.5 U/g for rice straw and OPEFB fibers, respectively. The optimum temperature for alpha-amylase production was observed at 45°C for the OPEFB fibers and 55°C for the rice straw. Among the defined carbohydrates, the addition of glucose (0.02 g/g dry substrate) has significantly improved the production of alpha-amylase. Similar effect was observed when yeast extract (0.01 g/g dry substrate) was supplemented as the additional nitrogen source. Rice straw appeared to be the best solid substrate in producing alpha-amylase (276 U/g) in SSF under these optimum cultivation conditions

View