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首页> 外文期刊>International Journal of Technology >Enhancing Removal Efficiency of Ammonia and Nitrate in Shrimp Farm Wastewater using Biofloc Technology and Effective Microorganisms 4 (EM4)
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Enhancing Removal Efficiency of Ammonia and Nitrate in Shrimp Farm Wastewater using Biofloc Technology and Effective Microorganisms 4 (EM4)

机译：使用Biofloc技术和有效微生物4（EM4）提高虾场废水中氨和硝酸盐的去除效率

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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.
机译：虾场产生的废水中含有高浓度的氨和硝酸盐，这些氨和硝酸盐是由饲料残渣和虾类分泌物产生的。本研究旨在通过应用Biofloc技术（BFT）结合有效微生物4（EM4）分析虾场废水中氨和硝酸盐的浓度变化，并确定降低氨和硝酸盐浓度的最佳EM4浓度。使用三个尺寸为40x25x30 cm3的处理池，在实验室规模下进行了30天的实验。每个装有7 L / min的曝气器和30瓦灯的储罐包含不同的EM4浓度：3毫升/升; 5毫升/升7毫升/升，15升淡水和20只小虾。在所有三个处理池中观察结束时，记录的水参数（如DO）范围为4.11-4.48 mg / l，pH 7.7-8.4和温度29.1-30.7oC。营养水平包括氨和硝酸盐，随着每个处理池中氨的最大去除量的下降，EM4为3 ml / l，5 ml / l和7 ml / l，分别为74.1％，84.2％和88.9％，而硝酸盐分别为68.4％，72.6％和83.7％。氨和硝酸盐浓度分别降低至约0.634 mg / l和1.261 mg / l。 EM4剂量为7 ml / l被认为是降低氨和硝酸盐浓度的最佳浓度。可以得出结论，BFT和EM4的组合成功地去除了虾场废水中的氨和硝酸盐，并在安全水平上维持了养分和水质，从而有潜力用作虾类养殖的水循环利用。

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