Ammonia removal from mixed dewatering liquors by three different deammonification technologies,Environmental Science: Water Research & Technology

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Ammonia removal from mixed dewatering liquors by three different deammonification technologies
Environmental Science: Water Research & Technology ( IF 3.5 ) Pub Date : 2020-11-03 , DOI: 10.1039/d0ew00875c
Pascal Ochs _{1,

2,

3,

4,

5} , Benjamin D. Martin _{3,

4,

5,

6} , Eve Germain _{3,

4,

5,

6} , Tom Stephenson _{1,

2,

3} , Mark C. M. van Loosdrecht _{7,

8,

9} , Ana Soares _{1,

2,

3}

Affiliation

Deammonification is an established biological nitrogen removal process for dewatering liquors from anaerobic digestion. Different deammonification technologies are being commercialised varying in control philosophy, biomass structure and reactor design. In this study three different pilot scale deammonification technologies were investigated to assess total nitrogen removal from mixed (pre and post digestion) dewatering liquors originated from thermal hydrolysis based anaerobic digestion process. The technologies tested included a suspended sludge sequencing batch reactor (S-SBR), a moving bed biofilm reactor (MEDIA) and a granular sludge sequencing batch reactor (G-SBR). This is the first study to compare side-by-side, three different deammonification technologies. All tested technologies were operated according to the manufacturer guidelines and demonstrated suitable nitrogen removal at loads varying between 0.3–0.8 kgN m⁻³ d⁻¹. During the operation of three technologies, periods of poor effluent quality due to disruptions or imbalances in the biological reactions were observed. The S-SBR had the lowest number of imbalances with 14 cases relating to free nitrous acid inhibition. Both S-SBR and MEDIA presented the highest nitrogen removal rate with 0.72 and 0.68 kgN m⁻³ d⁻¹, respectively. The G-SBR achieved nitrogen removal rates of 0.31 kgN m⁻³ d⁻¹ while presenting the highest number of imbalances that were related to inhibitive concentration of free ammonia or free nitrous acid of anammox. These inhibitions were caused by the control system relying on surrogate measurements for ammonia. Finally, only the S-SBR was operated at temperatures below 20 °C, caused by seasonal fluctuations, but still achieved nitrogen removal rates of 0.30 kgN m⁻³ d⁻¹. The number of deammonification technologies is growing, however, only a few but contradictive comparison studies exist. This comparison study can provide support for selection of sidestream deammonification technologies, by identifying the critical parameters.

中文翻译：

通过三种不同的脱氨技术从混合脱水液中去除氨

脱氨是一种成熟的生物脱氮工艺，用于将厌氧消化液脱水。在控制原理，生物质结构和反应器设计方面，不同的脱氨技术正在商业化。在这项研究中，研究了三种不同的中试规模的脱氨技术，以评估从基于热水解厌氧消化工艺的混合（消化前和消化后）脱水液中去除的总氮。测试的技术包括悬浮污泥测序批处理反应器（S-SBR），移动床生物膜反应器（MEDIA）和颗粒污泥测序批处理反应器（G-SBR）。这是首次比较三种不同脱氨技术的研究。^-3 d^-1。在使用三种技术的过程中，观察到由于生物反应的中断或不平衡而导致出水质量差的时期。S-SBR的失衡数最低，其中14例涉及游离亚硝酸抑制。S-SBR和MEDIA均表现出最高的脱氮率，分别为0.72和0.68 kgN m^-3 d^-1。G-SBR的脱氮率达到0.31 kgN m^-3 d^-1同时呈现出与抑制厌氧氨合的游离氨或游离亚硝酸浓度有关的最大数量的失衡。这些抑制作用是由控制系统依赖于替代氨的测量值引起的。最后，由于季节性波动，仅S-SBR在低于20°C的温度下运行，但脱氮率仍达到0.30 kgN m ^-3 d ^-1。脱氨技术的数量正在增长，但是，仅有少数但矛盾的比较研究存在。通过确定关键参数，该比较研究可以为选择侧流脱氨技术提供支持。

更新日期：2020-11-12

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