Judul: Kajian Proses Koagulasi Sebagai Perlakuan Pendahuluan Pada Teknik Pemisahan Mikroalga dengan Sedimentasi
Abstrak: Microalgae can grow fast in wastewater. Several techniques have been developed to remove it, but do not provide optimal results. Chemical and electro-coagulation as a pre-treatment of sedimentation technique was examined to remove microalgae from the wastewater. The wastewater used were effluent from animal farm and slaughterhouse. Chemical coagulant used are Poly Aluminium Chloride (PAC) and ferrous sulfate, whereas for electrocoagulation iron electrode was used. The efficiency of Total Suspended Solid (TSS) removal as a measure of microalgae removal reached to 98% for slaughterhouse wastewater at pH 7 with a PAC dose of 100 mg/L, 98% for animal farm wastewater at pH 7.25 with a PAC dose of 200 mg/L, 99% for slaughterhouse wastewater at pH 6.5 with a ferrous sulfate dose of 65 mg/L and 80% for animal farm wastewater at pH 6.75 with a ferrous sulfate dose of 120 mg/L. The efficiency of TSS removal as a measure of microalgae removal reached to 79% and 49% for slaughterhouse and animal farm wastewater on the direct current of 15 volt and operation time 40 minutes. In addition to microalgae removal, chemical and electrocoagulation lead to reduction of the wastewater turbidity, color, Chemical Oxygen Demand (COD) and phosphate.
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Judul: Kajian teknik elektrokoagulasi untuk pemisahan mikroalga
Abstrak: Although microalgae can grow fast in liquid wastes, there was no efficient technique yet for remove them. An electro-coagulation technique was examined to remove microalgae from the liquid wastes. For the batch system electro-coagulation process used in this experiments two aluminum electrode. This type of metal selected because it could introduce the coagulation agent into the liquid, there by microalgae could be removed. The used wastes are wastewater from animal husbandry and synthetic wastewater. The experiment was done by batch method used 1 Liter microalgae for each treatment on direct current variated from 9, 12 and 15 Volt and operation time from 10 to 40 minutes. The result of treatment were remarkably good and the efficiencies to total suspended solid (TSS) as the amount of microalgae removed reached to 51,55% for husbandry wastewater and 28,98% for synthetic on the direct current of 15 Volt and operation time 40 minutes. Beside can removed microalgae from wastewater electro-coagulation give effect for the other parameters of the wastewater like turbidity, color, concentration of COD, concentration of phosphate and pH value. The reduction of those parameters value reached along with the raising direct current voltage and operating time.
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Judul: Karakteristik Suara Song Burung Kenari (Serinus canaria) Postur Besar dan Kecil.
Abstrak: Burung kenari (Serinus canaria) memiliki nyanyian yang sangat bervariasi dengan durasi yang panjang dan merupakan tipe burung bernyanyi open learners. Penelitian ini bertujuan menganalisis karakteristik suara song burung kenari (Serinus canaria). Penelitian dilakukan pada bulan April sampai Juni 2017 di Bogor, Jawa Barat. Perekaman suara song terhadap 12 ekor burung kenari jantan dilakukan dengan menggunakan mikrofon Sennheiser ME66 dan alat perekam Sony PCM-D50. Burung kenari yang digunakan merupakan burung yang pernah mengikuti kontes burung kicau dan memiliki predikat juara kontes burung. Amplitudo, durasi suara, frekuensi, dan volume suara burung dianalisis dengan menggunakan software Raven Pro 1.4. Data tersebut selanjutnya dianalisis deskriptif. Hasil analisis suara menunjukkan bahwa burung kenari memiliki banyak syllable, suara song rapat dan tidak terputus-putus, tempo yang cepat, dan adanya pengulangan suku kata pada setiap suara song. Burung kenari postur kecil memiliki rataan durasi lebih panjang dibandingkan dengan kenari postur besar, tetapi burung kenari besar memiliki rataan max amplitudo, average power, max power, min amplitudo, peak amplitudo, dan peak frekuensi.
Keyword: karakteristik suara (song), kenari, syllable