Judul: Penanganan Limbah Ternak Sapi Perah di Tiga Lokasi di Daerah Bogor
Abstrak: Peranan usaha peternakan sapi perah pada ulnumnya untuk memenuhi permintaan konsumen akan susu segar yang sangat dibutuhkan ole11 setiap orang. Selain menghasilkan susu usaha petemakan sapi perah menghasilkan limbah berupa kotoran (feses) dan urine serta sisa-sisa pakan. Limbah petemakan dalam jumlah yang besar dapat menimbulkan permasalahan jika tidak ditangani dengan benar dan akan memberi keuntungan yang cukup besar jika ditangani secara baik dan memanfaatkannya, khususnya untuk lahan pertanian dan perkebunan.
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Judul: Kemampuan Instalasi Biodugester dalam Mengurangi Beban Pencemaran Limbah Cair dari Peternakan Sapi Perah Kebon Pedes Bogor
Abstrak: Peternakan sapi perah di Indonesia merupakan usaha yang telah ada sejak zaman penjajahan Belanda hingga saat ini. Salah satunya peternakan sapi perah yang berada di Kelurahan Kebon Pedes, kecamatan Tanah Sareal, Kota Bogor. Awalnya Kelurahan Kebon Pedes merupakan wilayah yang masih jarang penduduknya dan masih terdapat lahan yang luas untuk petemaltan sapi perah. Seiring perkembangan waktu, dimana jumlah pemukiman dan penduduk semakin bertambah, kini wilayah Kelurahan Kebon Pedes telah bertambah menjadi wilayah yang padat akan permuukiman dari penduduk. Keadam demikian meayebabkan peternakan sapi perah semakin terdesak dan menyebabkan timbulnya berbagai macam masalah bagi masyarakat sekitar, diantaranya polusi udara dan pencemaran lingkungan perairan yang di akibatltan dari pembuangan limbah, terutama limbah cair peternakan.
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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