Judul: Pemanfaatan Karbon Aktif dari Limbah Padat Industri Agar-agar sebagai Adsorben Logam Berat dan Bahan Organik dari Limbah Industri Tekstil
Abstrak: Limbah padat agar-agar merupakan limbah yang dihasilkan dari industri agar-agar dimana jumlahnya mencapai 65–70% dari total bahan baku. Limbah agar-agar diketahui mengandung selulosa yang cukup tinggi sehingga berpotensi untuk dimanfaatkan sebagai bahan baku pembuatan karbon aktif. Tujuan dari penelitian ini yaitu untuk membuat kabon aktif dari limbah padat agar-agar serta untuk mengetahui karakteristik karbon aktif yang dihasilkan. Karbon aktif terbaik kemudian diaplikasikan sebagai adsorben limbah industri tekstil. Penelitian dilaksanakan pada bulan Maret hingga Juli 2012. Karakterisasi limbah padat agar, pembuatan serta karakterisasi karbon aktif dilakukan di Laboratorium Karakterisasi Bahan Baku Hasil Perairan dan Laboratorium Biokimia Hasil Perairan, Departemen Teknologi Hasil Perairan, Fakultas Perikanan dan Ilmu Kelautan. Pengujian serat kasar dilakukan di Laboratorium Analisis Pangan, Departemen Ilmu dan Teknologi Pangan, Fakultas Teknologi Pertanian. Pengujian logam dilakukan di Laboratorium Bersama, Departemen Kimia, Fakultas Matematika dan Ilmu Pengetahuan Alam, sedangkan pengujian BOD dan COD dilakukan di Laboratorium Produktivitas dan Lingkungan Perairan, Departemen Manajemen Sumberdaya Perairan, Fakultas Perikanan dan Ilmu Kelautan, Institut Pertanian Bogor.
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Judul: Kombinasi Pemanfaatan Arang Aktif dari Limbah Padat Agar dan Kayu Apu (Pistia stratiotes) dalam Pengolahan Limbah Cair Industri Tekstil
Abstrak: The activated carbon (AC) is very popular used in sewage treatment, due to its high ability of adsorption. Waste water treatment in this research involves sea grass waste AC and aquatic plants, Pistia stratiotes. This research aims to asses the ability of active carbon made from solid waste which combined with Water Lettuce (P. stratiotes) in the processing of textiles industry wastewater. The results of the study showed the combination of AC and P. stratiotes is more efficient to reduce organic and inorganic contaminants than each single treatment. Active carbon and P. stratiotes combination is capable of reducing the TSS, total chrome, COD, and color concentration in a row of 90.90%, 83.91%, 25.73%, and 31.24%. All wastewater parameters measured already meet the quality standard at the end of the observation, except COD. The existence of nutrient used by P. stratiotes was marked by an increase in dissolved oxygen and plants biomass.
Keyword: textiles industry wastewater, Pistia stratiotes, nutrient, activated carbon, Bogor Agricultural University (IPB)

Judul: Dynamical System of Hepatitis B in Three Groups with Vaccination
Abstrak: The aim of this study is to modify the hepatitis B transmission model in three age groups involving vaccination from the model conducted by Zhoe and Zhang.The method used is to analyze the stability of the fixed point and its basic reproduction number (R_0). Performed stability analysis and numerical simulation to see population dynamics. Next, a sensitivity analysis of the parameters was carried out to see its effect on R_0. From the analysis obtained two fixed points, namely non-endemic and endemic fixed points. Non-endemic fixed points are locally asymptotically stable if R_0 <1 Meanwhile, the endemic fixed point is locally asymptotically stable if R_0 > 1. Hepatitis vaccination affects the number of susceptible population, because the more successful the vaccination, the smaller the number of susceptible populations so that the smaller the population will be infected.
Keyword: Dynamic, Hepatitis B, Vaccine, Mathematical model