Alejandro Moure Abelenda, K. Semple, A. Lag-Brotons, B. Herbert, G. Aggidis, F. Aiouache
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For analytical purposes, the sulfuric acid, water-soluble, and water-insoluble fractions of the blend were isolated after the incubation. The 1.07 mol/L sulfuric acid solution contained 23.69 ± 5.72 % more of ammonical nitrogen than the 0.11 mol/L solutions. However, in all cases the amount of nitrogen in the H2SO4 compartment was lower than the one in the water-soluble and water-insoluble fractions. Only the 15.52 ± 2.13 % of the nitrogen accounted after the incubation was found in the H2SO4 trap. The bottleneck of the NH3 stripping process was the rate of mass transfer at the interface between the blended fertilizer and the headspace of the closed chamber. The organic phosphorus was more susceptible to be adsorbed during the alkaline treatment with non-intrusive acidification than the nitrogen and carbon. 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引用次数: 5
摘要
本研究结合了两种养分管理策略,以提高废物来源肥料的适销性:(a)分离氨态氮和(b)制备散装土壤改良剂。将污染物含量较低的木粉煤灰作为碱性稳定剂添加到农业废弃物厌氧消化池中,促进氨的挥发和吸附过程,并作为营养补充。将39.71±1.44 g混合物在封闭腔(250 mL Schott Duran®瓶)中,在20°C和100 rpm下,与5.21±0.10 mL 10种不同浓度(0.11,0.21,0.32,0.43,0.54,0.64,0.75,0.86,0.96和1.07 mol/L)的硫酸阱中孵育60小时。为了便于分析,在孵育后分离出混合物的硫酸、水溶性和不水溶性部分。1.07 mol/L硫酸溶液比0.11 mol/L硫酸溶液含氨态氮多23.69±5.72%。然而,在所有情况下,H2SO4室中的氮含量都低于水溶性和不水溶性馏分中的氮含量。在H2SO4陷阱中,孵育后的氮仅占15.52±2.13%。NH3汽提过程的瓶颈是混合肥与密闭腔顶空界面处的传质速率。在非侵入式酸化碱性处理中,有机磷比氮和碳更容易被吸附。在与消化液混合之前,将灰分作为吸附剂活化,可以改善混合料作为缓释肥料的性能,因为更多的营养物质会以不溶于水的部分结束。
Alkaline Wood Ash, Turbulence, and Traps with Excess of Sulfuric Acid Do Not Strip Completely the Ammonia off an Agro-waste Digestate
The present study combined two nutrient management strategies to improve the marketability of a waste-derived fertilizer: (a) isolation of ammoniacal nitrogen and (b) preparation of a bulk soil amendment. The wood fly ash with low content of pollutants was added to an agrowaste anaerobic digestate as alkaline stabilizer, which promoted the volatilization of ammonia and adsorption processes, and as nutrient supplement. The 39.71 ± 1.44 g blend was incubated for 60 hours at 20°C and 100 rpm in a closed chamber (250-mL Schott Duran® bottle) with a 5.21 ± 0.10 mL sulfuric acid trap of 10 different concentrations (0.11, 0.21, 0.32, 0.43, 0.54, 0.64, 0.75, 0.86, 0.96, and 1.07 mol/L). For analytical purposes, the sulfuric acid, water-soluble, and water-insoluble fractions of the blend were isolated after the incubation. The 1.07 mol/L sulfuric acid solution contained 23.69 ± 5.72 % more of ammonical nitrogen than the 0.11 mol/L solutions. However, in all cases the amount of nitrogen in the H2SO4 compartment was lower than the one in the water-soluble and water-insoluble fractions. Only the 15.52 ± 2.13 % of the nitrogen accounted after the incubation was found in the H2SO4 trap. The bottleneck of the NH3 stripping process was the rate of mass transfer at the interface between the blended fertilizer and the headspace of the closed chamber. The organic phosphorus was more susceptible to be adsorbed during the alkaline treatment with non-intrusive acidification than the nitrogen and carbon. Activation of the ash as adsorbent before mixing with the digestate should improve the properties of the blend as slow release fertilizer, since more nutrients would end in the water-insoluble fraction.