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All Journal Jurnal Ilmu Kelautan Spermonde Jurnal Industri Hasil Perkebunan
Alimuddin Hamzah Assegaf
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Agriculture, Biological Sciences & Forestry Chemical Engineering, Chemistry & Bioengineering Earth & Planetary Sciences Environmental Science Industrial & Manufacturing Engineering

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SOME CHARACTERISTICS OF ATMOSPHERIC BOUNDARY LAYER OVER MAKASSAR Alimuddin Hamzah Assegaf; Wasir Samad; Sakka Sakka
Jurnal Ilmu Kelautan SPERMONDE VOLUME 4 NOMOR 1, 2018
Publisher : Hasanuddin University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20956/jiks.v4i1.3797

Abstract

Some upper air atmospheric parameters measured during period of 2011-2016 by means of radiosonde located at Hasanuddin International Airport were examined for characterization of boundary layer over Makassar, Indonesia. These data, combined with surface atmospheric parameters were used to calculate some boundary layer parameters using AERMET model which based on Monin-Obukhov similarity theory. The obtained Monin-Obukhov length which reflecting atmospheric stability then converted into traditional Pasquill-Gifford stability classification. Examination of wind characteristics of wind showing clearly their dependence of the day, season and height. Winds dominantly flows from the southeast during the daytime with the relatively larger velocity and from the northwest with smaller velocity during the nighttime. Interpretation of monin-obukhov length using Pasquill-Gifford stability classification showing that the atmosphere was dominantly unstable during the daytime and dominantly stable during the nighttime. These atmospheric stabilities were also varied during seasons. The height of convective boundary layer (CBL) was start to rise in the morning and reaching its maximum in the afternoon (18:00) at the mean value of 2 km. Meanwhile, the height of mechanical boundary layer (MBL) during the day time forming parabolic curve with its maximum value of 1.2 km at noon. These indicated that any released pollution from the stack will be less dispersed during the nighttime due to the fact of lower mixing height, lower wind speed, atmosphere become more stable, and it dispersed in different direction compare to the daytime.
PEMBUATAN BIOBRIKET DARI SERASAH DAN AMPAS KOPI SERTA PENAMBAHAN LIMBAH BUBUK KAKAO SEBAGAI PENGAROMA Achmad Hadiasyah; Alimuddin Hamzah Assegaf; Farid Samawi
Jurnal Industri Hasil Perkebunan Vol 16, No 2 (2021): Jurnal Industri Hasil Perkebunan
Publisher : BBSPJI Hasil Perkebunan, Mineral Logam, dan Maritim

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33104/jihp.v16i2.7101

Abstract

Serasah memiliki nilai kalori sebesar 6180,41 kal/g (Naparin dkk, 2019) dan ampas kopi memiliki nilai kalori sebesar 4713 kal/g (Kusuma et al, 2017), merupakan contoh jenis sampah organik yang bisa di manfaatkan sebagai sumber energi alternatif dalam bentuk biobriket. Biobriket adalah kumpulan arang dari biomassa yang telah terkarbonisasi. Selain untuk mendapatkan komposisi yang tepat antara serasah dan ampas kopi yang memenuhi syarat mutu sesuai SNI 01-6235-2000, Penelitian ini juga fokus pada peningkatan mutu biobriket dari segi aroma yang khas dengan penambahan limbah bubuk kakao. Penelitian ini menggunakan desain percobaan faktorial dengan perlakuan komposisi serasah masing-masing 90%,70%, 50% serta komposisi ampas kopi masing-masing10%,30% dan 50%. Hasil penelitian menunjukkan kadar air yakni 6,59% -7,88%, kadar abu yakni 6,81% -8,01%, kadar zat terbang yakni 40,20%-41,88%, kadar karbon terikat yakni 43,57%-44,91% dan nilai kalori yakni 5000,84 cal/g – 5031,78 cal/g. Penerimaan panelis terhadap aroma perlakuan 90% serasah dan 10% ampas kopi ialah 6 40%) suka; 8(53%) cukup suka; 1(7%) tidak suka ; perlakuan 70% serasah dan 30% ampas kopi ialah 7 (47%) suka; 7(46%) cukup suka; 1(7%) tidak suka; perlakuan 50% serasah dan 50% ampas kopi ialah 7(47%) suka; 8(53%) cukup suka. Perlakuan terbaik pada penelitian ini adalah perlakuan 90% serasah dan 10% ampas kopi.
Co-Authors Achmad Hadiasyah Farid Samawi Sakka Sakka Wasir Samad