Abstract
Nitrogen concentrations are often found in ammonia, nitrite, nitrate, and neutral nitrogen waters. This research has investigated the simultaneous removal of biological nitrogen nitrification and denitrification (SND) in a continuous flow system of activated sludge processes. This research was conducted by variations in carbon sources is namely glucose and methanol. Variations of C / N ratios of 5, 10, and 20 were also carried out. The main parameters were analyzed every day until the end of the research period. The main parameter analyzed is ammonia-nitrogen. Besides, additional parameters were also analyzed in the form of COD, nitrate-nitrogen, nitrite-nitrogen, pH, MLSS, SVI, and DO. The results of research indicate artificially excess nitrogen wastewater can be treated using SND and can produce sufficiently good effluent quality if the operations are running optimally. The highest ammonia-nitrogen removal efficiency of 100% shown by the variation of the carbon methanol source and value of the C / N 20 ratio then followed by the C / N 10 ratio of 78% and the C / N 5 ratio of 59%. Overall, the data shown appropriate controls for carbon and nitrogen inputs are needed to achieve an efficient SND. Proper SND technology can save operating time and energy, and may replace two traditional stages: biological nitrification and denitrification processes.
Highlights
Nitrogen compounds are nutrient elements and the main components making up organic substances needed for the growth of microorganisms
Ammonia-nitrogen removal contained in excess artificial nitrogen wastewater is one of the parameters in this research using the activated sludge system with the Simultaneous Nitrification Denitrification (SND) method
In the variation of the carbon methanol source, the most optimal ammonia removal at a C / N ratio of 100% was on the 4th day andthe allowance was 100%.Whereas when the C / N 5 ratio gets an ammonia allowance of 60% on the 4th day and the average allowance is at 59%
Summary
Nitrogen compounds are nutrient elements and the main components making up organic substances needed for the growth of microorganisms. Pollution of water bodies by nutrients in the form of nitrogen compounds is one of the problems that arise due to the development of the industry. Biological treatment processes with activated sludge are most commonly used to remove nitrogen due to high efficiency and low cost [2]. According to Machat (2009) that in its development the process of nitrification and denitrification canbe carriedout inone process and bothofthese stepscanbe carried out simultaneously inone reactor which leads to simplification of the equipment needed [1]. This process has been labeled "Simultaneous Nitrification Denitrification" or SND
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