Understanding the formation of recalcitrant dissolved organic nitrogen as a result of thermal hydrolysis and anaerobic digestion of municipal sludge,Environmental Science: Water Research & Technology

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Understanding the formation of recalcitrant dissolved organic nitrogen as a result of thermal hydrolysis and anaerobic digestion of municipal sludge
Environmental Science: Water Research & Technology ( IF 3.5 ) Pub Date : 2021-1-12 , DOI: 10.1039/d0ew00944j
Dian Zhang _{1,

2,

3,

4} , Zhaohui An _{1,

2,

3,

4} , Mary Strawn _{4,

5,

6} , Tom Broderick _{4,

5,

6} , Wendell Khunjar _{4,

7,

8} , Zhi-Wu Wang _{1,

2,

3,

4}

Affiliation

This study for the first time investigated the turnover of dissolved organic nitrogen (DON) in lab-scale thermal hydrolysis pretreatment (THP) operated for 2.5 hours at different temperatures with and without mesophilic anaerobic digestion (AD) at a solids retention time of 15 days. Results showed that THP at the temperature ranging from 110 to 190 °C substantially increased the levels of recalcitrant dissolved organic nitrogen (rDON) by 110–310% as defined by DON that can survive aerobic incubation for more than 3 days at oxygen utilization rates <0.002 ml L⁻¹ h⁻¹. At all THP temperatures, rDON made up 14–16% of the DON generated from THP and 71–77% of the DON coming out of the AD following THP. The mesophilic AD cannot reduce the total rDON level but increased the high molecular weight fractions of rDON, recalcitrant soluble chemical oxygen demand (rSCOD), color and UV-quenching. Because of this anaerobic transformation, the originally strong correlation of rDON to the THP temperature, rSCOD, color and UV-quenching disappeared after mesophilic AD.

中文翻译：

了解城市污泥的热水解和厌氧消化导致难分解的溶解有机氮的形成

这项研究首次研究了实验室规模的热水解预处理（THP）在不同温度下进行2.5小时，有和没有中温厌氧消化（AD），固体保留时间为15天的情况下溶解有机氮（DON）的转化率。。结果表明，THP在110到190°C的温度范围内，使DON定义的顽固性可溶有机氮（rDON）含量显着增加了110-310％，可以在需氧条件下在有氧条件下存活3天以上。 0.002毫升L ^-1小时^-1。在所有THP温度下，rDON占THP产生的DON的14–16％，THP产生的AD产生的DON的71–77％。中温AD不能降低总rDON水平，但会增加rDON的高分子量分数，难降解的可溶性化学需氧量（rSCOD），颜色和紫外线猝灭。由于这种厌氧转化，中温AD后rDON与THP温度，rSCOD，颜色和UV猝灭之间的强烈相关性消失了。

更新日期：2021-01-21

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