Judul: Adsorpsi asam lemak bebas minyak goreng bekas menggunakan adsorben limbah padat tapioka
Abstrak: Produk reaksi degradasi yang terdapat dalam minyak akan menurunkan mutu minyak menimbulkan pengaruh buruk bagi kesehatan. Penelitian ini mempelajari kemampuan limbah padat tapioka sebagai adsorben untuk menurunkan kadar asam lemak bebas (ALB) dan bilangan peroksida (BV) pada minyak goreng bekas. Penelitian ini terdiri atas tiga tahap. Tahap pertama adalah preparasi limbah padat tapioka. Tahap kedua berupa aktivasi kimia limbah padat tapioka menggunakan asam fosfat 10, 20, dan 30% dengan waktu aktivasi selama 2, 4, dan 6 jam. Tahap terakhir adalah penentuan kondisi optimum berupa konsentrasi asam fosfat, waktu serta penentuan isoterm adsorpsi dan aplikasi pada minyak goreng bekas. Hasil penelitian menunjukkan bahwa limbah padat tapioka dapat menyerap asam lemak bebas dan bilangan peroksida pada minyak goreng bekas. Semakin besar kadar asam fosfat yang digunakan, semakin banyak asam lemak bebas yang terserap sehingga efisiensi penjerapannya naik. Penggunaan limbah padat tapioka dapat menurunkan ALB dari 2,15 menjadi 0,60% dan BV berkurang dari 5,82 menjadi 2,01 mg O2/100 g. Model isoterm adsorpsi limbah padat tapioka dikaji dengan 2 model isoterm, yaitu isoterm Langmuir dan Freundlich. Model isoterm Freundlich memberikan nilai regresi sebesar 97,57% yang menunjukkan bahwa adsorpsi asam lemak bebas dengan limbah padat tapioka sesuai dengan model Freundlich.
Keyword: Semidrying oil, Full otomate, Adsorbat

Judul: Adsorpsi asam lemak bebas dan zat warna menggunakan campuran kaolin-limbah padat tapioka
Abstrak: Adsorption of free fatty acids in used cooking oil and methylene blue dye is studied. The results showed that the mixture of kaolin and tapioca solid waste is a potential adsorbent for the adsorption free fatty acids and dyes. The effect of kaolin activation treatment, such as heating temperature and the use of acid is also studied. The best activation results for the kaolin activation used in the free fatty acid adsorption was heating treatment at 750 °C followed by treatment with H2SO4 30%, whereas for methylene blue adsorption by acid treatment only. Activation of tapioca solid waste was using 30% H3PO4 treatment. Optimum conditions for adsorption, adsorption capacity, and adsorption efficiency of a mixture of kaolin and tapioca solid waste showed different results and specific for each type of sample used. For the same amount of adsorbent, free fatty acid adsorption was reached in 90 minutes using the ratio of activated kaolin and tapioca solid waste of 25:75 (1:3). Meanwhile, methylene blue adsorption was achieved at 30 minutes with the ratio of activated kaolin and tapioca solid waste of 75:25 (3:1). The results showed that the type of adsorption isotherm for free fatty acids was Freundlich isotherm, whereas for methylene blue adsorption was Langmuir isotherm.
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Judul: Etno-ornitologi Burung Kancilan Flores (Pachycephala nudigula nudigula Hartert 1897) pada Masyarakat Lio di Taman Nasional Kelimutu
Abstrak: Bare-throathed whistler is one of several wild birds in Kelimutu National Park (TNKL) that is believed to have correlation with Lio Community‟s belief. The estimation of Bare-throated whistler‟s population in Kelimutu National Park was about 186.41-1668.07 individual by the density about 0.0389-0.3481 ind/ha with the sex ratio 6.2:1 that spreaded on area with height of 1100 – 1600 masl. The characteristic of Bare-throated whistler‟s habitat is a natural forest with various canopy level, high plant species diversity and high density. The habitat characteristics related to the availability of food in the form of insects, cover, safety and a nesting site. Generally the most of Lio community knew the existence of Bare-throated whistler directly or from their parents‟ stories. The perceptions of Lio Community to the Bare-throated whistler‟s existence is generally support the conservation efforts. The perceptions construct the Lio Community‟s atitude that tend to be conservative to the existence of Bare-throated whistler. The attitude shown by their behavior that not cathing the Bare-throated whistler from the TNKL‟s area or the outside. The attitude have an important role to the existence of Bare-throated whistler in Kelimutu National Park‟s area.
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