ABSTRACT

Ammonia (NH₃) stripping by microwave irradiation was used to increase the efficiency of anaerobic digestion. The effects of final temperature (FT) (80 ≤ FT ≤ 100°C) and microwave irradiation time (MIT) (2.5 ≤ MIT ≤ 5.5 min) of NH₃ stripping, and hydraulic retention time (HRT) (7 ≤ HRT ≤ 20 d) in anaerobic digester were quantified. NH₃ concentration decreased from 2794 to 140 mg/L within 5.5 min at FT = 100°C. The highest cumulative biogas production (>1800 mL/L) and efficiency of volatile solid removal (> 68%) were achieved at FT = 100°C and MIT = 5.5 min. The removal efficiency of volatile solid in digesters fed with untreated swine wastewater (control) and swine wastewater treated by NH₃ stripping decreased as HRT decreased. The highest relative improvement of properties compared to the control occurred at 10 or 15 d HRT. Increases in biogas production compared to the control increased with the NH₃ stripping as HRT was reduced to 10 d (243% higher at 10 d). The methane content of the produced biogas was 64–69% for control and 68–75% with NH₃ stripping in the range of 10–20 d HRT. NH₃ stripping using microwave irradiation is an effective pretreatment to improve the anaerobic digestion of swine wastewater.

摘要

通过微波辐射进行的氨 (NH ₃ ) 汽提被用于提高厌氧消化的效率。 NH _{3汽提的最终温度（} FT）（80≤FT≤100   ℃）和微波辐射时间（MIT）（2.5≤MIT≤5.5min  ）和水力停留时间（HRT）（7≤HRT≤20）的影响d) 在厌氧消化池中进行定量。在FT = 100°C 时， NH ₃浓度在 5.5 分钟内从 2794 降至 140 mg/L  。在FT  = 100°C 和MIT时实现了最高的累积沼气产量 (>1800 mL/L) 和挥发性固体去除效率 (> 68%) = 5.5 分钟 随着 HRT 的降低，使用未经处理的猪废水（对照）和经过 NH _{3汽提处理的猪废水的消化池中挥发性固体的去除效率降低。}与对照相比，性能的最高相对改善发生在 10 或 15 天 HRT 时。随着 HRT 减少至 10 天（在 10 天时高出 243%）， NH ₃汽提与对照相比沼气产量增加。在 10-20 天的 HRT 范围内，所产生沼气的甲烷含量为 64-69%（对照）和 68-75%（NH _{3汽提）。}使用微波辐射去除NH ₃是提高猪废水厌氧消化的有效预处理方法。