Judul: Potensi Tanaman Air Mencuat Cyperus haspan L. dalam Memperbaiki Kualitas Air Limbah Rumah Potong Hewan dengan Sistem Artificial Wetland
Abstrak: Slaughterhouse is an industry which facilitates the community to meet the needs of animal protein (meat), but also produces waste. Slaughterhouse wastewater organic waste classified as potentially contaminants. Therefore be treated in environmental friendly as well as affordable wastewater treatment. Cyperus haspan L. can be used for waste water treatment system with Artificial Wetlands. The aim of this research is to test the potential of aquatic plants to reduce levels of pollutants in wastewater slaughterhouse. The main research done with treatment the water using replicates plant biomass. The analysis was done by measuring the water quality parameters of BOD, COD, TSS, nitrate, and orthophosphate three times as well as the parameters of temperature, pH, and DO every day within 20 days. Data analysis were using a completely randomized design over time (RAL in time). The results showed that, Cyperus haspan L. from Slaughterhouse waste can reduce pollutants by 71 % BOD and 94 % TSS for 10 days of observation at the beginning. Daily specific growth of each treatment was 0,1014 (g/day); 0,0568 (g/day); and 0,0449 (g/day).
Keyword: wastewater, slaughterhouse, Cyperus haspan L., Artificial wetlands, Bogor Agricultural University (IPB)

Judul: IPB (Bogor Agricultural University)
Abstrak: Isu menurunnya kualitas air menjadi semakin kuat dengan meningkatnya jumlah industri yang membuang limbah cair ke perairan tanpa dilakukan pengolahan limbah atau kurang memadainya perlakuan yang seharusnya dilakukan oleh industri. Penelitian kajian pemanfaatan media dan tumbuhan air sebagai pengendali limbah cair, dikenal dengan konsep fitoremediasi. Penelitian ini bertujuan untuk : (1) Mengetahui karakteristik tingkat pencemaran perairan sungai Tapung Kiri, (2) melakukan kajian efektivitas pemanfaatan media penyaring dan tumbuhan air lokal dalam mengurangi bahan pencemar dari limbah cair, (3) menyusun teknik pengolahan limbah cair dengan media penyaring dan pemanfaatan tumbuhan air lokal dalam mengurangi bahan pencemar limbah cair. Percobaan dilakukan dalam tiga tahap yang meliputi, persiapan, prapenelitian, dan percobaan utama. Percobaan utama dilakukan dengan rancangan petak terbagi (split plot design). Hasil penelitian menunjukkan bahwa perairan sungai Tapung Kiri secara umum dari hulu ke hilir tergolong kategori tercemar berat. Kombinasi media aluvial-zeolit mampu menurun kadar bahan pencemar lebih tinggi dari media aluvial yakni 9 parameter mampu menurun kadar bahan pencemar berkisar antara 75-100%, tumbuhan air gabungan Scirpus grossus-Pistia stratiotes (wlingen-kiapu) mampu menurunkan kadar bahan pencemar lebih tinggi dari perlakuan lainnya yakni 11 parameter menurun kadar bahan pencemarnya berkisar antara 75-100%. Teknik pengolah limbah yang terbaik digunakan adalah gabungan media tanah aluvial-zeolit dengan gabungan tumbuhan air Scirpus grossus-Pistia stratiotes, yakni 13 parameter mampu menurun kadar bahan pencemar berkisar antara 75-100%, dan diikuti Echinodorus paleafolius-Pistia stratiotes (11 parameter) serta Limnocharis flava-Pistia stratiotes (11parameter).
Keyword: Wastewater, Filter media, Aquatic plants

Judul: Metrik Einstein (Anti-) Self-Dual Berdimensi Empat dengan Metode Cartan
Abstrak: Gravitational field equation can be formulated in differential forms (differential geometry), which describes gravity as a manifestation of the curvature of space-time. Curvature of space-time is characterized by a metric that satisfies the gravitational field equation. With differential forms it can be formulated the (anti-) self-dual Einstein equation, which is a modification of the Cartan structure in (anti-) self-dual basis. Calculation of (anti-) self-dual metric with (anti-) self-dual Einstein equation is simpler than the calculation using Christoffel symbols.
Keyword: