Judul: Penggunaan Teknologi Membran Nanofiltrasi di Dalam Sistem Resirkulasi Akuakultur untuk Optimalisasi Kualitas Efluen
Abstrak: Air limbah budidaya perikanan mengandung bahan organik yang tinggi. Membran nanofiltrasi dapat diterapkan di dalam RAS karena memiliki kemampuan tinggi untuk menghilangkan partikel organik dan anorganik kecil. Penelitian ini bertujuan menganalisis kualitas air limbah budidaya ikan koi setelah diolah menggunakan membran nanofiltrasi (NF). Terdapat enam perlakuan yang dibedakan berdasarkan persen recovery dan aliran retentat, yaitu variasi 1 30% retentat dikembalikan, variasi 2 70% retentat dikembalikan, variasi 3 50% retentat dikembalikan, variasi 4 30% retentat dibuang, variasi 5 70% retentat dibuang, dan variasi 6 50% retentat dibuang. Hasil penelitian menunjukkan NF secara keseluruhan optimal dalam mereduksi kontaminan nitrit dan TSS. Variasi paling efektif dalam mereduksi parameter-parameter pencemar terdapat pada variasi 5.
Keyword: fluks, membran nanofiltrasi, RAS

Judul: Variation of Multimedia Filter Thickness on Processing Performance of Aquaculture Recirculation System for Ornamental Fish Cultivation
Abstrak: Limbah cair ini memiliki banyak unsur hara diantaranya kandungan bahan organik dan anorganik, logam, dan ammonia. Sehingga, membutuhkan penanganan khusus untuk dapat mereduksi kandungannya. Penelitian ini bertujuan menganalisis potensi reduksi pencemaran air limbah hasil budidaya ikan hias koi dengan variasi debit dan ketebalan Multimedia Filter (MMF). Adapun desain dalam penelitian adalah 6 kombinasi debit dan ketebalan MMF, yaitu variasi 1 debit 45 L/menit ketebalan 30 cm, variasi 2 debit 22,5 L/menit ketebalan 30 cm, variasi 3 debit debit 45 L/menit ketebalan 60 cm, variasi 4 debit 22,5 L/menit ketebalan 60 cm, variasi 4 debit 45 L/menit ketebalan 90 cm, dan variasi 4 debit 22,5 L/menit ketebalan 90 cm. Hasil menunjukan bahwa variasi 5 dapat mereduksi seluruh parameter sesuai dengan standar baku mutu. Hasil filtrasi MMF pada variasi lima dapat mereduksi parameter ammonia dan nitrit sebesar 99,85% dan 99,80%.
Keyword: Ammonia, multimedia filter, nano membrane, RAS, zeolite

Judul: Lejeuneaceae Subfamily Ptychanthoideae (Hepaticae) in  West Java
Abstrak: Subfamily Ptychanthoideae of the family Lejeuneaceae (Hepaticae) in West Java is still poorly known. Publications on this subfamily are out of dated and written in the 19th or early of 20th century. The last taxonomic treatment of Ptychanthoideae of West Java was in 1933, many species names have changed since then. Studies on Ptychanthoideae of West Java are urgently needed. Studies on the Ptychanthoideae were based on the specimens collected from West Java. A total number of 361 of specimens deposited in the Herbarium Bogoriense (BO), Herbarium Biotrop (BIOT), Gottingen Herbarium (GOET) and Bangi Herbarium (UKMB) were examined, those are old and several recent specimens collected in West Java. Recent collections were made from Telaga Warna, Ciater, Gunung Halimun Salak National Park, Cibodas Botanical Garden, Bodogol Education Center and Conservation (Gunung Gede Pangrango National Park), University of Indonesia Campus Depok, including several collections from Banten Province. Twenty four species of Lejeuneaceae subfamily Ptychanthoideae are known from West Java, belonging to 8 genera namely Acrolejeunea (Spruce) Schiffn. (2 species), Archilejeunea (Spruce) Schiffn. (1 species), Lopholejeunea (Spruce) Schiffn. (10 species), Mastigolejeunea (Spruce) Schiffn. (3 species), Ptychanthus Nees (1 species), Schiffneriolejeunea Verd. (1 species), Spruceanthus Verd. (2 species) and Thysananthus Lindenb. (4 species). Two new records of Ptychanthoideae: Mastigolejeunea indica Steph. and Thysananthus minor Verdoorn are reported for Java. A determination key to the species is presented including their descriptions and illustrations.
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