Judul: Penentuan Tahanan Nanofiltrasi Menggunakan Model Tahanan Seri Pada Pemisahan Beta-Karoten dan Alfa-Tokoferol Minyak Sawit Dalam Isopronal
Abstrak: Palm oil contains high concentration of carotenoids anf tochoperols that can be recoveredby adsorption using attapulgite and desorption in isopropanol and then applying membrane technology to separate the beta-carotene and alpha-condition of nanofiltration and to obtain resistance of membranes using the series resistance model. titania membraneswith different pore diameters (5 and 10 nm) were used to conduct the study on nanofiltration membranes. Applied pressure was range from 1.5 to 2.5 bar and crossflow velocity was range from 0.14 to 0.97 m s-1. It was found that membrane 5 nm had optimum transmembrane pressure at 2 bar and feed flow velocity at 0.42 m s-1 with permeate flux 0.96 L m-2 h-1. On n the other side, membrane 10 nm had optimum transmembrane pressure at 2.2 bar and feed flow velocity at 0.69 m -1' with permeate flux 2.4 L m-2 h-1 . The intrinsic membrane resistances, Rm, the total membrane resistances, R'm, and the fouling T esistances, Rf, of membrane 5 nm were 0.25, 2.08 and 1.29 bar m2 h -1, respectively, with the resistance index, Ø, was 1.04 m2 h -1. On the other side, membrane 10 nm had Rm, R'm and Rf 0.78, 0.49 and 0.24 bar m2 h L-1, respectively, with 0 was 0.42 m2 h L-I. The conclusion of this research is nofiltration 5 and 10 nm are ineffective to separate beta-carotene and alpha- tocopherol in isopropanol because permeate flux and rejection are very low with resistances of membranes and resistance index are very high. So that to increase V g gg the permeate flux and rejection needed study about usage of different membrane and solvent type, conditioning of feed and controlling of aggregate alpha- tocopherol in isopropanol.
Keyword: Nanofiltration, Series resistance, Beta-carotene, Alpha-tocopherol, Isopropanol, Vitamin E, Reologi, Membran, Model tahanan seri, Nilai tahanan foulig (Rf), Nilai indeks polarisasi konsentrasi, Pengaruh laju air umpan terhadap Flulig

Judul: The Effect of Pressure Variations on the Application of Nanofiltration Membranes in Aquaculture Recirculating Systems
Abstrak: Penggunaan membran nanofiltrasi dengan pengoperasian jangka panjang sebagai unit pengolahan menimbulkan fouling yang tak terhindarkan akibat adanya proses polarisasi konsentrasi pada permukaan membran. Konsentrasi terpolarisasi dan kenaikan tekanan osmotik juga penyebab penurunan fluks permeate. Penelitian bertujuan menganalisis pengaruh tekanan yang diterapkan pada sistem resirkulasi akuakultur dengan teknologi membran nanofiltrasi terhadap konsentrasi kontaminan permeate. Penelitian ini dilakukan pada bulan Maret – Juli 2023 yang berlokasi di Laboratorium Terpadu Departemen Teknik Sipil dan Lingkungan, Fakultas Teknologi Pertanian, Institut Pertanian Bogor. Penelitian ini menggunakan tiga variasi tekanan yang berbeda yakni tekanan 5, 6, dan 7 bar. Variasi 7 bar memiliki nilai efisiensi penolakan kontaminan amonia dan nitrit sebesar 100%. Pemodelan dilakukan untuk estimasi konsentrasi kontaminan nitrit di permeate membran nanofiltrasi. Hasil uji validasi dengan regresi linear menunjukkan pengembangan pemodelan sangat baik dalam mengestimasi konsentrasi kontaminan permeate membran nanofiltrasi karena memiliki indikator nilai R square mendekati satu., The use of nanofiltration membranes with long-term operation as a treatment unit causes unavoidable fouling due to the concentration polarization process on the surface of the membrane. Polarized concentrations and increased osmotic pressure also cause a decrease in permeate flux. The aim of this study was to analyze the effect of pressure applied to the aquaculture recirculating system with nanofiltration membrane technology on the concentration of permeate contaminants. This research was conducted in March – July 2023 located at the Integrated Laboratory of the Department of Civil and Environmental Engineering, Faculty of Agricultural Technology, Bogor Agricultural University. This study used three different pressure variations, namely 5, 6, and 7 bar. The 7 bar variation has an efficiency value of 100% for rejecting ammonia and nitrite contaminants. Modeling was performed to estimate the concentration of nitrite contaminants in the permeate nanofiltration membrane. The results of the validation test with linear regression showed that the development of modeling was very good in estimating nanofiltration membrane permeate contaminant concentrations because it had an indicator value of R square close to one.
Keyword: estimasi konsetrasi, fluks, membran nanofiltrasi, tekanan

Judul: Prevalence of Bird Lice on Rock Pigeon (Columba livia) in 99Wonderland Park, Selangor, Malaysia
Abstrak: Rock Pigeon (Columba livia) have coexisted with humans for thousands of years and are used for various purposes such as food and in sports. Rock pigeons may have the potential to be infested with a wide range of ectoparasites, which can have a significant impact on their life cycle. This study aims to measure the prevalence of Columba livia with bird lice in 99Wonderland Park, Selangor, Malaysia in the year 2020 and to ascertain the impact of bird lice on the health of these infested birds. Data were collected from clinical records for the month of January to December in the year 2020 from 99Wonderland Park, Selangor, Malaysia. Lice were identified in 42 of the 80 Rock pigeons examined so, the overall prevalence of lice infestations was 52.5%. The prevalence of ectoparasites was found to be higher in young Rock pigeons (60.4%) as compared to adult Rock pigeons (37.4%). Columbicola columbae (wing lice) and Colpocephalum turbinatum (body lice) are two species of lice that have been detected. Body lice were more prevalent in young Columba livia birds at 47.6% whereas wing lice were more prevalent in adult Columba livia birds at 16.7%. Most of the lice were found in the thorax and abdomen area followed by the head and neck area., Merpati Batu (Columba livia) telah hidup berdampingan dengan manusia selama ribuan tahun dan digunakan untuk berbagai keperluan seperti makanan dan olahraga. Merpati batu dapat terinfestasi dengan berbagai ektoparasit, yang dapat berdampak signifikan pada siklus hidup mereka. Penelitian ini bertujuan untuk mengetahui prevalensi Columba livia dengan kutu burung di 99 Wonderland Park, Selangor, Malaysia pada tahun 2020 dan untuk memastikan dampaknya terhadap kesehatan burung yang terinfestasi. Data dikumpulkan dari catatan klinis dari bulan Januari hingga Desember tahun 2020 dari 99Wonderland Park, Selangor, Malaysia. Kutu diidentifikasi pada 42 dari 80 merpati batu yang diperiksa sehingga, prevalensi keseluruhan infestasi kutu adalah 52,5%. Prevalensi ektoparasit ditemukan lebih tinggi pada merpati batu muda (60,4%) dibandingkan dengan merpati batu dewasa (37,4%). Columbicola columbae (kutu sayap) dan Colpocephalum turbinatum (kutu badan) adalah dua spesies kutu yang telah ditemukan. Kutu badan lebih banyak ditemukan pada burung Columba livia muda sebesar 47,6% sedangkan kutu sayap lebih banyak ditemukan pada burung Columba livia dewasa sebesar 16,7%. Sebagian besar kutu ditemukan di daerah dada dan abdomen diikuti daerah kepala dan leher.
Keyword: Columba livia, prevalence, ectoparasite, wing lice, body lice, Columba livia, prevalensi, ektoparasit, kutu sayap, kutu badan