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Enhancing aerobic digestion of full-scale waste activated sludge using free nitrous acid pretreatment

机译：游离亚硝酸预处理可增强对全尺寸活性污泥的需氧消化

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摘要

Aerobic digestion is one of the mainstream technologies for waste activated sludge (WAS) reduction and stabilization prior to disposal, but its effectiveness is limited by the poor degradation of WAS. This study presents a novel strategy based on free nitrous acid (FNA i.e. HNO2) pre-treatment to enhance full-scale WAS degradation in aerobic digestion. The full-scale WAS was subject to FNA treatment at 2.0 mg HNO2-N per L for 24 h. The degradation of the FNA-treated WAS was then compared to that of the same WAS without FNA pre-treatment by aerobically digesting the WAS with a full-scale activated sludge for 14 days. Approximately 50% of the FNA-treated WAS was degraded during the 14 day aerobic digestion compared to 32% achieved with the untreated WAS. The inorganic nitrogen production (originating from breakdown of WAS) from the FNA-treated WAS was 43 mg N per g of mixed liquor volatile suspended solids (MLVSS) in the 14 day aerobic digestion, whereas its production from the untreated WAS was only 29 mg N per g of MLVSS, confirming the effectiveness of the FNA pre-treatment in enhancing aerobic digestion of full-scale WAS. Economic analysis showed that the FNA pre-treatment method was economically attractive, saving a cost of %-15 500-64 500 per year depending on WAS disposal cost in a treatment plant with a population equivalent of 80 000.
机译：有氧消化是减少废物处理前活性污泥（WAS）和使其稳定的主流技术之一，但其有效性受到WAS降解不良的限制。这项研究提出了一种基于游离亚硝酸（FNA，即HNO2）预处理的新策略，以增强有氧消化中WAS的全面降解。以每升2.0 mg HNO2-N的水平对WAS进行FNA处理24小时。然后将FNA处理的WAS的降解与未进行FNA预处理的相同WAS的降解进行比较，方法是用全尺寸活性污泥需氧消化WAS 14天。在14天的有氧消化过程中，经过FNA处理的WAS约有50％降解，而未经处理的WAS达到了32％。在14天的需氧消化中，经FNA处理的WAS的无机氮产量（源自WAS的分解）为每毫克混合液挥发性悬浮固体（MLVSS）43 mg N，而未经处理的WAS的无机氮产量仅为29 mg N每克MLVSS中含有N，证实了FNA预处理在增强全面WAS的需氧消化中的有效性。经济分析表明，FNA预处理方法在经济上具有吸引力，根据在相当于80,000人口的污水处理厂中的WAS处置成本，每年可节省％-15 500-64 500。

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