Judul: Telaah kualitas dan kuantitas limbah industri tapioka serta cara pengendaliannya di daerah Bogor dan sekitarnya
Abstrak: Penelitian ini dilakukan guna memperoleh gambaran tentang beberapa segi kegiatan industri tapioka di daerah Begor dan sekitarnya, terutama yang berkaitan dengan pe­nanganan limbahnya. Selanjutnya secara terperinci dila­kukan telaah sifat air industri tapioka yang cukup opti­mal., analisis sifat limbahnya baik kualitas maupun kuan­titasnya, analisis berbagai perubahan sifat limbah selama proses netralisasi, telaah cara pengendalian limbah yang praktis serta kemungkinan pemanfaatan limbah padat (ong­gok) sebagai substrat protein sel tunggal dan biogas.
Keyword: Cassava flour;, Wastes;, Environmental control;, Biodegradable;, Profit margin;, Manihot utilissima;

Judul: Studi kualitas air dan limbah cair industri tapioka rakyat di daerah Bogor
Abstrak: Penelitian ini bertujuan untuk mengetahui macam dan kualitas, air yang digunakan pada industri tapioka rakyat di daerah Bogor, serta kualitas limbah yang dibuang ke perairan sekitarnya. Pengamatan dilakukan terhadap cara penjernihan air dan sifat fisika-kimia air seperti kadar oksigen, bahan organik, pH, kekeruhan, besi, sulphat dan lain-lain. Sedangkan sifat limbah yang dianalisa adalah temperatur kekeruhan, pH, karbon dioksida, bahan organik, BOD-5, padatan tersuspensi, kadar oksigen, dan asam sianida. Penilaian kualitas air didasarkan kepada standar air minum menurut Peraturan Menteri Kesehatan RI, Sk. Men. Kes. RI. No. 01/BIRHUKMAS/ 1/75. tgl 26 April 1975. Pemakaian standar tersebut disebabkan belum terciptanya standar air untuk industri tapioka dan karena tapioka digunakan sebagai bahan pangan. Penilaian terhadap limbah didasarkan kepada hasil pengukuran beberapa sifat fisika-kimia serta indikator adanya pertumbuhan organisme terutama ikan.
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Judul: Hybrid solar cells of ZnO nanoparticles/chlorophyll was modified metal ions (Zn2+ and Cu2+ )
Abstrak: Zinc Oxide (ZnO) is a n-type semiconductor with a wide the energy band (Band Gap) is 3.37 eV at room temperature and 3.34 eV at low temperature with a large exiton binding energy is 60 meV. ZnO has been synthesized by hydrothermal method, resulting in a decrease in particle size over the duration of the hydrothermal changes. Crystallographic structure of ZnO were characterized using XRD, has shown the characteristic pattern of a hexagonal wurtzite structure, the crystallite size increases to changes in particle size. Changes in particle size has also led to a change in the absorption peak of ZnO as has been demonstrated posted under test using the optical properties of UV-Vis spectrophotometer. Changes of this uptake has also led to changes in the energy band gap, which increases its band gap energy of the particle size. In electronic applications, especially in solar cells. Chlorophyll is considered less effective, because of their very nature are easily degraded as a result of several reactions which are acid, lighting and temperature. The results of the stability test using a halogen lamp 34 W/m2 for 5 hours, that the substitution of chlorophyll with metal ions Zn2+ and Cu2+ has been shown to form more stable than natural chlorophyll. The characterization of the optical properties, the combination of ZnO / chlorophyll in the form of hybrid films has led to a shift in the absorption region of ZnO becomes more widely from the UV to Visible. ZnO/chlorophyll has absorption range of 350-515 nm, ZnO / Zn-feofitin 332-401 nm and 332-632 nm for Cu-feofitin. The combination of ZnO/chlorophyll and CuSCN as a solid electrolite in hybrid solar cell, a modified chlorophyll with metal ions Zn2+ and Cu2+ has been shown to form a more stable I-V curve. It is characterized by its fill factor value greater than natural chlorophyll. Nevertheless, solar cells with natural chlorophyll has been able to produce higher efficiency values of chlorophyll were substituted.
Keyword: Hydrothermal, ZnO/Chlorophyll modified, Hybrid Solar Cell