Temporal Variation of Nitrogen and Sulfur Species of Food Waste and Sludge during Anaerobic Co-Digestion

Sustainability

卷:14

Zhi Qian¹  Xiaopeng Ge²  Yuxiu Zhang³  Pengzhou Kang³ 

[1] College of Resources and Environment, University of Chinese Academy of Sciences, Beijing 100049, China;

[2] Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China;

[3] School of Chemical and Environmental Engineering, China University of Mining & Technology (Beijing), Beijing 100083, China;

关键词: food waste;    sewage sludge;    anaerobic co-digestion;    nitrogen;    sulfur;   

DOI  :  10.3390/su14094982

来源: DOAJ

【 摘 要 】

Anaerobic co-digestion (AcoD) has been a widely accepted method to treat food waste (FW) and sewage sludge (SS). However, there is a knowledge gap regarding the key speciation transformation of nitrogen and sulfur in AcoD. Here, we explored the changes of nitrogen (N) and sulfur (S) compounds in liquid digestion and biogas, as well as the composition of microbial community structure and related metabolic functions. The results showed that H₂S in the biogas was the main form of S in the early stage, and then, it was converted into SO₄²⁻ and SO₃²⁻, while NH₃ and NH₄⁺ were the main forms of N during the AcoD. In addition, bacterial diversity was associated with N and S compounds; Syntrophomonas and Aminobacterium were positively correlated to H₂S, NH₃, NH₄⁺ and SO₃²⁻, and Saccharibacteria_genera_incertae_sedis, Candidatus_Cloacamonas and Thermomonas were positively correlated to SO₄²⁻ and NO₂⁻. Additionally, the FAPROTAX prediction showed that the functional composition related to N and S metabolism was different from SS and inoculum after the AcoD. This study provides detailed information of conversion of N and S of the AcoD, which could lay a foundation for the subsequent regulation of the mechanism of nitrogen and sulfur compounds in the methanogenic process.

【 授权许可】

Unknown