The Experts below are selected from a list of 11403 Experts worldwide ranked by ideXlab platform
Pretty Mori Budiman - One of the best experts on this subject based on the ideXlab platform.
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improving photofermentative biohydrogen production by using intermittent Ultrasonication and combined industrial effluents from palm oil pulp and paper mills
Energy Conversion and Management, 2017Co-Authors: Pretty Mori Budiman, Ramakrishnan Nagasundara Ramanan, Jamaliah Md JahimAbstract:Abstract An Ultrasonication technique was applied intermittently onto photofermentation broth during the first six hours of photofermentation to improve biohydrogen production by using Rhodobacter sphaeroides NCIMB8253. In this research, photofermentation broth consisted of a combination of palm oil (25%, v/v), pulp and paper (75%, v/v) mill effluents as well as liquid inoculum. The effects of amplitude (10, 20 and 30%, A) and Ultrasonication duration (5, 10 and 15 min, T) were investigated in terms of their influences on photofermentative biohydrogen yield and total chemical oxygen demand (COD total ) removal. The recommended Ultrasonication parameters were found at the middle range of amplitude and duration (A20T10). Using A20T10 intermittent treatment, the production of biohydrogen could be maximized up to 14.438 mL H 2 /mL medium with a COD total removal and light efficiency of 52.2% and 7.412%, respectively. By comparing the treatment without intermittent Ultrasonication, an increase of biohydrogen yield by 44.6% was achieved in A20T10 treatment. A total energy input of 306.1 J/mL (A20T10 treatment) was supplied to improve substrate consumption and light distribution during the photofermentation, which led to the increase of biohydrogen yield.
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Ultrasonication pre treatment of combined effluents from palm oil pulp and paper mills for improving photofermentative biohydrogen production
Energy Conversion and Management, 2016Co-Authors: Pretty Mori BudimanAbstract:Abstract The improvement of batch photofermentative biohydrogen production was investigated using Ultrasonication pre-treatment on a combined effluent of palm oil and pulp and paper mills. The effects of the amplitude (30–90%) and Ultrasonication duration (5–60 min) were investigated in terms of their influences on the biohydrogen yield and chemical oxygen demand (COD) removal. The recommended Ultrasonication parameters were found at the higher ranges of amplitude and duration (A70T45). Using A70T45 Ultrasonication, the production of biohydrogen at 30 °C could be enhanced up to 8.72 mL H 2 /mL medium , with a total COD removal of 36.9%. During pre-treatment at A70T45, an energy input of 775 J/mL was supplied to disintegrate complex compounds into simpler structures. As a result, an increase in the soluble organic matter concentration was achieved, which led to enhanced biohydrogen production. On the other hand, the lowest biohydrogen yield (4.67 mL H 2 /mL medium ) and total COD removal (28.8%) were obtained in the control without pre-treatment. The enthalpy of the photofermentation process was estimated to be 141.1 kJ/mol with a threshold temperature of 30.9 °C based on a modified Arrhenius approach.
A M N L Abesinghe - One of the best experts on this subject based on the ideXlab platform.
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effects of Ultrasonication on the physicochemical properties of milk fat globules of bubalus bubalis water buffalo under processing conditions a comparison with shear homogenization
Innovative Food Science and Emerging Technologies, 2020Co-Authors: Bhesh Bhandari, A M N L Abesinghe, J K Vidanarachchi, Nazrul Islam, Sangeeta Prakash, K F S T Silva, M A KarimAbstract:Abstract Ultrasonication has been widely studied in bovine milk but the effects of ultrasound (US) on the buffalo's milk fat globules (MFG) are not well known yet. In this study, buffalo's milk samples were ultrasonicated at 20 kHz and physicochemical properties were assessed under different processing conditions. Shear homogenization was performed with 1188 J/mL energy density for the comparison. Results show that Ultrasonication reduced the average volume-weighted mean diameter (D[4,3]) of MFG by 93% and increased the surface area by a factor of 8.5 compared to the native counterparts. The zeta-potential (ZP) of MFG are increased by Ultrasonication compared to fresh milk (−26.37 vs. −18.22 mV) indicating better stability. Changing the pH of ultrasonicated milk to the isoelectric pH (pI) reduced the zeta-potential (ZP) by −19.8 mV and increased the (D[4,3]) > 0.4 mm indicating the gelation. The size of milk particles increased up to 76–586 μm and the ZP was reduced by 3.1 mV with the increase of ionic strength from 50 to 200 mM. Heating of milk at 90 °C for 30 min increased D[4,3] in US homogenized milk by 22%. Both Ultrasonication and shear-homogenization increased the free saturated fatty acids by 2.75–3 g/100 g fat compared to raw buffalo's milk. Ultrasonication increased the gel hardness by 98% compared and shear-homogenized milks. The results of this study indicate that the Ultrasonication reduced the size of buffalo's MFG up to sub-micron level with superior stability while improving (P Industrial relevance Buffalo set-yoghurts made with unhomogenized milk exhibit higher syneresis and poor stability upon shear-induced breakdown, which are mainly due to the porous gel structure containing a large number of bigger fat globules. Under the large scale production, buffalo set-yoghurts are often fortified with dairy/non-dairy solids and stabilizers in order to prevent this problem. However, the use of some inexpensive, non-food grade alternatives are also reported in some parts of the world for the cottage or medium level production of buffalo yoghurts. In this work, it was shown that Ultrasonication with the energy density of 1188 J/mL can be used to produce buffalo set-yoghurts with superior gel strength and therefore, can be used as an unconventional approach to improve the product quality.
Jamaliah Md Jahim - One of the best experts on this subject based on the ideXlab platform.
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improving photofermentative biohydrogen production by using intermittent Ultrasonication and combined industrial effluents from palm oil pulp and paper mills
Energy Conversion and Management, 2017Co-Authors: Pretty Mori Budiman, Ramakrishnan Nagasundara Ramanan, Jamaliah Md JahimAbstract:Abstract An Ultrasonication technique was applied intermittently onto photofermentation broth during the first six hours of photofermentation to improve biohydrogen production by using Rhodobacter sphaeroides NCIMB8253. In this research, photofermentation broth consisted of a combination of palm oil (25%, v/v), pulp and paper (75%, v/v) mill effluents as well as liquid inoculum. The effects of amplitude (10, 20 and 30%, A) and Ultrasonication duration (5, 10 and 15 min, T) were investigated in terms of their influences on photofermentative biohydrogen yield and total chemical oxygen demand (COD total ) removal. The recommended Ultrasonication parameters were found at the middle range of amplitude and duration (A20T10). Using A20T10 intermittent treatment, the production of biohydrogen could be maximized up to 14.438 mL H 2 /mL medium with a COD total removal and light efficiency of 52.2% and 7.412%, respectively. By comparing the treatment without intermittent Ultrasonication, an increase of biohydrogen yield by 44.6% was achieved in A20T10 treatment. A total energy input of 306.1 J/mL (A20T10 treatment) was supplied to improve substrate consumption and light distribution during the photofermentation, which led to the increase of biohydrogen yield.
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reusing pulp and paper mill effluent as a bioresource to produce biohydrogen through ultrasonicated rhodobacter sphaeroides
Energy Conversion and Management, 2016Co-Authors: Jacqueline Xiao Wen Hay, Joon Ching Juan, Jamaliah Md JahimAbstract:Abstract Pulp and paper industry is a water-intensive industry. This industry commonly produces considerable amount of effluent, especially from virgin raw materials processing. The effluent, namely pulp and paper mill effluent has the potential to adversely affect the receiving watercourses. However, the nutrients in the pulp and paper mill effluent could be reused as a substrate in biohydrogen production. In this study, photofermentative biohydrogen production was investigated using Rhodobacter sphaeroides and pulp and paper mill effluent as a substrate. An application of low power ultrasound on R. sphaeroides was predicted to increase photofermentative biohydrogen production but excessive ultrasound effects might inhibit the production due to possible cell disruption. Hence, various Ultrasonication duration (5, 10 and 15 min) and amplitude (15%, 30% and 45%) were applied on the bacteria to determine the recommended Ultrasonication conditions for improving biohydrogen production. The recommended conditions were operated at Ultrasonication amplitude and duration of 30% and 10 min, respectively. A maximum biohydrogen yield of 9.62 mL bioH 2 /mL medium was obtained under this condition, which was 66.7% higher than the result obtained using R. sphaeroides without undergoing Ultrasonication (control). The light efficiency and cell concentration were increased by 67% and 150%, respectively, using Ultrasonication amplitude and duration of 30% and 10 min, respectively as compared to the control. The present results demonstrated that moderate power of Ultrasonication applied on R. sphaeroides was an effective method for enhancing photofermentative biohydrogen production using raw pulp and paper mill effluent as a bioresource.
Munishwar N. Gupta - One of the best experts on this subject based on the ideXlab platform.
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Extraction of oil from Jatropha curcas L. seed kernels by combination of Ultrasonication and aqueous enzymatic oil extraction
Bioresource Technology, 2005Co-Authors: Shweta Shah, Aparna Sharma, Munishwar N. GuptaAbstract:Use of Ultrasonication as a pretreatment before aqueous oil extraction and aqueous enzymatic oil extraction was found to be useful in the case of extraction of oil from the seeds of Jatropha curcas L. The use of Ultrasonication for 10 min at pH 9.0 followed by aqueous oil extraction gave a yield of 67%. However, the maximum yield of 74% was obtained by Ultrasonication for 5 min followed by aqueous enzymatic oil extraction using an alkaline protease at pH 9.0. Use of Ultrasonication also resulted in reducing the process time from 18 to 6 h.
A Das - One of the best experts on this subject based on the ideXlab platform.
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on the microstructural refinement in commercial purity al and al 10 wt cu alloy under Ultrasonication during solidification
Materials & Design, 2017Co-Authors: Hiren Kotadia, Ma Qian, D G Eskin, A DasAbstract:Physical grain refinement is examined under high-intensity Ultrasonication during solidification in commercial purity Al (CP-Al) and binary Al-10 wt% Cu alloy melts cooled naturally in air and compared against chemical inoculation using Al-5Ti-1B grain refiner. The coarse dendritic unrefined base microstructure was completely replaced with a fine equiaxed grain structure in the case of either inoculation or Ultrasonication. However, Ultrasonication produced more effective refinement over chemical inoculation with a two-fold and eight-fold increase in the grain density in CP-Al and Al-10%Cu alloy, respectively. While combining chemical inoculation with Ultrasonication produced the finest grain structure in CP-Al, no further improvement over Ultrasonication was noted for the Al-10%Cu alloy. Noticeable reduction in nucleation undercooling, of similar magnitude to chemical inoculation, was observed under Ultrasonication. Cooling curve observations indicate strongly enhanced heterogeneous nucleation under Ultrasonication. It appears that although chemical inoculation utilises higher potency nucleants, more nucleation events are favoured under cavitation.
