Nitrogen is one of the essential nutrients for plants. Even though its availability in the air is abundant, it cannot be utilized yet due to its structure. Plasma electrolysis by air injection is effectively degrade organic textile dyes waste. In this study we propose a novel air plasma electrolysis (APE) where direct air injection into plasma zone inside electrolysis plasma can converts air into nitrate, while simultaneously the degradation of dyes waste produces organic nitrogen. Degradation of organic textile dye by APE can also transform nitrogen-rich organic wastewater into nitrogen fertilizers. In this experiment, Remazol red as a compound in the azo dye group was used as a model for organic textile dye wastewater. Air plasma electrolysis reactor equipped with a stainless-steel cathode, a tungsten anode, with various air injection rates and electric power. The results show 99.82% Remazol red degradation and 41.41 mmol of nitrate production. Preliminary efficacy tests on tomato plants showed that the nitrogen fertilizers produced from Remazol red produce the best plant growth. This study shows that APE simultaneously reduces organic textile dye waste, transforms them into potential organic fertilizer, and at the same time, synthesizes nitrates.
Phenolic compounds are pollutants which have high toxicity and could be harmful to the environment even at low concentrations. The degradation of phenolic has been conducted by various methods including photocatalytic and ozonation. However, these methods require high costs and large energy. Therefore, plasma electrolysis by the Fenton reaction may be an alternative method for phenol degradation. The purpose of this study is to determine the optimum conditions for phenol degradation by adding Fe2+ ions. The result shows that the most effective phenol degradation was obtained by using an optimum power of 700 watts with an air injection flow rate of 0.2 L/min and addition Fe2+ 20 ppm ions for 30 min experiments. Based on these conditions, the concentration of phenol in waste was reduced to 0.425 mg/L and the highest percentage of phenol degradation (99.58%) was observed. The final phenol concentrations obtained in this study met the quality standards for clean water at a concentration of 1 mg/L as well as the quality standards for drinking water treatment at a concentration of 0.5 mg/L.
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