Piggery wastewater treatment using Alcaligenes faecalis strain No. 4 with heterotrophic nitrification and aerobic denitrification

Mathematical simulating the process of aerobic granular sludge treating high carbon and nitrogen concentration wastewater

“…It implies that the N removal is conducted mainly by heterotrophic nitrification and aerobic denitrification. Joo also reported that the heterotrophic nitrifier could aerobically remove high strength of COD and ammonia simultaneously [22]. The above results strongly suggest that heterotrophic nitrifiers and aerobic denitrifiers play important roles in these wastewater treatment systems, and heterotrophic nitrification and aerobic denitrification processes exist widely in wastewater treatment.…”

“…Recently, aerobic process of treating high carbon and nitrogen wastewater (e.g. piggery wastewater, high salinity and high nitrogen organic wastewater and synthetic wastewater at low temperature) without any pretreatment were reported [22,[28][29][30]. PCR-DGGE and clone library analysis showed the heterotrophic nitrifiers and aerobic denitrifiers were the dominant microorganisms in these aerobic wastewater treatment system.…”

“…With the increase of C/N in inflow, the AOB and nitrite oxidizing bacteria (NOB) significantly decrease, while the heterotrophic bacteria gradually increase [20,21]. In recent years, there are many reports about heterotrophic nitrification and aerobic denitrification [22][23][24]. Different from autotrophic nitrifiers, heterotrophicnitrifying bacteria can simultaneously using carbon and nitrogen pollutants.…”

“…On the other hand, in a high carbon and nitrogen wastewater treatment, a strong aeration is generally necessary, which might cause high dissolved oxygen (DO) concentration in the particles. And researches [22,23] showed that denitrification could be carried out in the presence of oxygen.…”

“…Meanwhile, the process of heterotrophic nitrification and aerobic denitrification has always been related to high C/N ratios [22,24]. Recently, aerobic process of treating high carbon and nitrogen wastewater (e.g.…”