Journal
BIORESOURCE TECHNOLOGY
Volume 355, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2022.127199
Keywords
Swine wastewater; One-stage PNA; Ammonia concentration; BOD5; N ratio; DO
Funding
- Environmental Restoration and Conservation Agency of Japan [JPMEERF20211005]
- program of Advanced Graduate School Pioneering Research Support Project for PhD Students
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A study evaluated the nitrogen and biodegradable organic matter removal of swine manure digestate using the SNADCO process. The results showed that AnAOB played a major role in nitrogen removal, while denitrifying bacteria had a smaller contribution. In terms of COD removal, ordinary heterotrophic organisms and denitrifying bacteria were important contributors. Specific bacteria activity tests and microbial analysis revealed that a highly efficient synergism between functional microorganisms is crucial for the stability of the SNADCO process.
A simultaneous partial nitritation, anammox, denitrification, and COD oxidation (SNADCO) process was used to evaluate the nitrogen and biodegradable organic matter removal of swine manure digestate based on a nitrite limitation and ammonium surplus strategy. As influent ammonium concentration increased from 500 mg/L to 2100 mg/L, the 5 day biochemical oxygen demand (BOD5) maintained at a high removal efficiency of 95.4%. However, nitrogen removal efficiency (NRE) decreased from 90.9% to 68.2% due to the inhibition of AnAOB caused by an ammonium concentration of 2100 mg/L. The contribution of AnAOB to nitrogen removal was 75.6-86.5%, while that of denitrifying bacteria was 4.6-7.0%. In the case of COD removal, the contributions were from ordinary heterotrophic organisms and denitrifying bacteria, at 27.1-64.9% and 11.2-22.1%, respectively. The results of specific bacteria activity tests and microbial analysis showed that a highly efficient synergism between functional microorganisms is essential for the stability of the SNADCO process.
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