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Hassimi Abu Hasan,Siti Rozaimah Sheikh Abdullah,Noorhisham Tan Kofli,Shy Jay Yeoh 한국공업화학회 2016 Journal of Industrial and Engineering Chemistry Vol.37 No.-
In this study, the interaction of pH, biomass and initial concentrations of lead (Pb) and manganese (Mn)ions in simultaneous removal of Pb and Mn were investigated using the Box–Behnken design. The resultsshowed that there was a significant interaction between pH-Pb:Mn concentrations, pH-biomassconcentration and Pb:Mn-biomass concentrations. The maximum uptake of Pb and Mn was achieved atpH 7. By increasing the Pb and Mn concentrations from 10 to 50 mg/L, the uptake capacities alsoincreased. By increasing the biomass concentration from 0.3 to 1.5 g/L, the uptakes (g/g) of both metalions by Bacillus cereus I6 was depleted. The precipitation of Pb and Mn on the surface of B. cereus I6 cellswas confirmed by energy dispersive X-ray (EDX) transmission electron microscopy (TEM), and Fouriertransform infrared (FTIR). Thus, simultaneous biosorption of Pb and Mn by isolated I6 strain can beefficiently performed under different interactions of environmental factors.
Hassimi Abu Hasan,Siti Rozaimah Sheikh Abdullah,Siti Kartom Kamarudin,Noorhisham Tan Kofli 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.30 No.-
This study was conducted to determine an effective completion point of the simultaneous removal ofNH4+–N and Mn2+, using a biological aerated filter (BAF). The simultaneous removal was performed andmonitored under two operation modes: i.e., batch and continuous. Each mode was operated bysupplying continuous aeration for 7.5 h and intermittent aeration for 6 h. The results showed a higherperformance of the simultaneous removal of NH4+–N and Mn2+ for the batch with full operation ofaeration. The effective curves were detected for dissolved oxygen (DO), oxidation-reduction potential(ORP) and pH profiles, correlating with the complete simultaneous removal of NH4+–N and Mn2+. Byrecognising the curves, the complete simultaneous NH4+–N and Mn2+ removal can be predictedeffectively, affecting a reduction in human capital and operating costs.
Fathiyyah Mohd Zainudin,Hassimi Abu Hasan,Siti Rozaimah Sheikh Abdullah 한국공업화학회 2018 Journal of Industrial and Engineering Chemistry Vol.57 No.-
In developing countries such as Malaysia, chlorination is a popular and inexpensive technique fordisinfecting water before distribution to consumers. However, the chlorination process results in theformation of low concentrations of toxic trihalomethanes (THMs), which may, over long periods ofexposure, lead to adverse effects in consumers. Thus, these compounds should be prevented fromforming and removed from drinking water and wastewater through either physicochemical or biologicaltechniques. In this paper, an overview of the various technologies for the removal of THM precursors andTHMs is presented. In addition, emerging technology using microbes to effectively biodegrade THMs isalso discussed. Biodegradation technology has the potential to eliminate THM precursors and THMs fromwater and wastewater and has the advantages of being a green technology and being inexpensive tooperate and maintain compared with other physicochemical techniques.
Asia Fadhile Almansoory,Hassimi Abu Hasan,Mushrifah Idris,Siti Rozaimah Sheikh Abdullah,Nurina Anuar,El Mubarak Musa Tibin 한국공업화학회 2017 Journal of Industrial and Engineering Chemistry Vol.47 No.-
Based on the nutritional and physiological requirements of a native hydrocarbon-degrading bacterium(HDB), Serratia marcescens, an investigation on the potential biosurfactant production by this bacterialspecies was conducted. The effects of different carbon sources, nitrogen sources, salinity, pH,temperature, and agitation speeds were extensively studied. The optimal conditions of biosurfactantproduction and surface tension were determined using central composite design (CCD) by settingglycerol, peptone and ammonium sulphate (NH4)2SO4 in a range of 3–7%, 2–6 g/L and 3–7 g/L,respectively. The results showed that biosurfactant was highly produced at pH 8, a temperature of 30 C, asalinity of 1% and a speed of 200 rpm after 5 days (120 h) of incubation. The optimal conditions wereobtained at 5% glycerol, 4 g/L peptone and 5 g/L (NH4)2SO4 with a maximum biosurfactant production of1.42 g/L and a minimum surface tension of 28.4 mN/m. Thus, the HDB S. marcescens shows good potentialas a biosurfactant-producing bacterium to be used in any environmental application and as an alternativeto chemical surfactants.
Blocking mechanism of PES membrane during ultrafiltration of POME
Muhammad Said,Akil Ahmad,Abdul Wahab Mohammad,Mohd Tusirin Mohd Nor,Siti Rozaimah Sheikh Abdullah 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.21 No.1
Ultrafiltration (UF) is one of the options for secondary treatment of palm oil mill effluent (POME). However, membrane fouling is still amajor problemin this process. The effects of pressure, temperature,pH and ionic strength on flux decline were further studied using Hermia’s model. It was found thatstandard blocking, cake layer, and intermediate blocking can be dominant mechanisms depending onthe operating conditions. The rejections of some parameters were also investigated. The optimumconditions were found to be 5 bars, 40 8C and pH of 9.05. Hydrophobicity of the membrane can alsoinfluence the percentage rejection of parameters.
Oginawati Katharina,Susetyo Septian Hadi,Rahmawati Sri Intan,Kurniawan Setyo Budi,Abdullah Siti Rozaimah Sheikh 한국독성학회 2022 Toxicological Research Vol.38 No.2
This study aims to determine the distribution of organochlorine pesticide pollution in water, sediments, mollusks, and fish at Saguling Dam as baseline data of organochlorine pollution. Samples were obtained from 12 locations, with 9 and 3 sampling points inside and outside the dam, respectively. Measurement of organochlorine residues was carried out using methods of extraction, purification, evaporation, and gas chromatography. Results showed the presence of several types of organochlorine compounds, namely, lindane, aldrin, dieldrin, heptachlor, dichlorodiphenyltrichloroethane (DDT), and endosulfan. Aldrin was dominant in water (2–37 μg/L) and sediments (2–1438 μg/L), while DDT and heptachlor were dominant organochlorine compounds in mollusks (13–2758 μg/L) and fish (11–104 μg/L), respectively. Sediments demonstrated higher organochlorine concentrations than water, mollusk, and fish. The distribution of organochlorine was affected by land use around the Citarum watershed and pollutant input from tributaries.