Ammonium nitrogen dosing strategy for developing phosphorus mining from marine sediments driven by anaerobic reactors: Observation from two carbon-fed systems
Few studies have explored the role of carbon:nitrogen ratio in affecting internal release of phosphorus (P) under anaerobic environments, although the importance of the Redfield ratio has been well established on marine microbial communities. This study investigated the external addition of carbon (acetic acid and glucose) and ammonia nitrogen (NH4-N) on P release mechanisms from marine sediment. The results showed that extra NH4-N loading significantly suppressed the decomposition of P (p<0.05) from marine sediments and during the 24-day anaerobic operation, the maximum P release was 4.07 mg/L and 7.14 mg/L in acetic acid- and glucose-fed system, respectively, without extra NH4-N addition. Enrichment of families Clostridiaceae and Leptotrichiaceae in the glucose-fed system under under anaerobic environments could be the main driver for rapid glucose consumption, while additional NH4-N reduced the relative abundance of sulfate-reducing bacteria, which suppressed P decomposition.