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Abstrak :
ABSTRACT
Indonesia merupakan negara dengan produktivitas tambak udang tertinggi yakni sebesar 267 kg/ha pada tahun 2012. Potensi yang besar tersebut menyebabkan Indonesia menerapkan budidaya tambak udang semi intensif, dengan memanfaatkan luas sekecil mungkin dan padat penebaran sebesar mungkin. Budidaya tersebut akan menghasilkan air limbah dengan kadar amonia dan nitrat yang tinggi yang berasal dari sisa pakan dan kotoran udang. Kadar amonia dan nitrat pada air tambak udang dapat diolah menggunakan teknologi bioflok dengan bantuan Effective Microorganisms 4 (EM4). Penelitian ini dilaksanakan selama 31 hari dalam skala laboratorium menggunakan akuarium berukuran 40 cm x 25 cm x 30 cm yang berisikan 15 liter air tambak dan udang sebanyak 20 ekor, dengan variasi konsentrasi EM4 3 ml/l, 5 ml/l, dan 7 ml/l. Berdasarkan uji statistik dengan Independet t-test perbandingan variasi konsentrasi EM4 3ml/l dengan 5 ml/l dan EM4 5 ml/l dengan 7 ml/l menghasilkan perbedaan yang tidak signifikan sedangan perbandingan konsentrasi EM4 3 ml/l dengan 7 ml/l menunjukkan perbedaan yang signifikan sehingga kedua konsentrasi tersebut dapat dikomparasikan. Persentase penurunan rata-rata amonia untuk pemberian konsentrasi EM4 3 ml/l, 5 ml/l, dan 7 ml/l masing-masing 74,079%, 84,161% dan 88,864%. Sedangkan persentase penurunan nitrat pemberian konsentrasi EM4 3 ml/l, 5 ml/l, dan 7 ml/l masing-masing 68,429%, 72,579% dan 83,650%.

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ABSTRACT
Indonesia is a country has a high shrimp farms production, as many as 267 kg/ha in 2012. That great potential caused Indonesia to apply semi-intensive shrimp aquaculture, by utilizing the smallest area with the highest stocking rate. The shrimp farms generates wastewater which contained high levels of ammonia and nitrate from feed residue and dirt shrimp. Ammonia and nitrate levels in wastewater shrimp farms can be processed using biofloc technology by helping Effective Microorganisms 4 (EM4). This research was carried in 31 days with laboratory scale using an aquarium measuring 40 cm x 25 cm x 30 cm containing 15 liters water in ponds and shrimp as many as 20 shrimps, with the variations of EM4 consentrations, which is 3 ml/l, 5 ml/l, and 7 ml/l. Based on the statistical test by Independent t-test, comparison of various concentration EM4 3ml/l with 5 ml/l and EM4 5 ml/l and 7 ml/l resulted in not significant difference while the comparison of various 3 ml/l with 7 ml/l showed a significant difference so that two concentration can be compared. The biggest reduction percentage of ammonia for aquarium with EM4 concentration 3 ml/l, 5 ml/l, and 7 ml/l respectively 74,079%, 84,161% and 88,864%, while the biggest reduction percentage of nitrate respectively were 68,429%, 72,579% and 83,650%.

Abstrak :
Shrimp farms generates wastewater which contain high concentration of ammonia and nitrate produced from feed residue and shrimp secretion. This study aimed to analyse concentration changes of ammonia and nitrate in shrimp farm wastewater by applying Biofloc Technology (BFT) combined with Effective Microorganisms 4 (EM4), and to determine the optimum concentration of EM4 in reducing ammonia and nitrate concentration. Experiment was carried out for 30 days in laboratory scale using three treatment tanks sized of 40x25x30 cm3. Each tanks equipped with aerator 7 L/min and lamp 30 watts contains different EM4 concentration: 3 ml/l; 5 ml/l; and 7 ml/l, 15 liters of fresh water, and 20 young shrimps. By the end of observation in all three treatment tanks, water parameter such as DO was recorded in ranged between 4.11-4.48 mg/l, pH 7.7-8.4, and temperature 29.1-30.7oC. Nutrients level include ammonia and nitrate were declined with the maximum removal of ammonia concentration from each treatment tank for EM4 3 ml/l, 5 ml/l, and 7 ml/l were 74.1%, 84.2%, and 88.9%, whereas for nitrate were 68.4%, 72.6%, and 83.7%, respectively. Ammonia and nitrate concentration were reduced to about 0.634 mg/l and 1.261 mg/l, respectively. Dosage EM4 of 7 ml/l was considered as the optimum concentration in reducing ammonia and nitrate concentration. It can be concluded that combination of BFT and EM4 is successfully work in removing ammonia and nitrate wasted in shrimp farm wastewater and maintain the nutrients and water quality in the safety level so that potential to be used as water recycle for shrimp aquaculture