Performance of heterotrophic partial denitrification under feast-famine condition of electron donor: A case study using acetate as external carbon source

Nitrate residual as a key parameter to efficiently control partial denitrification coupling with anammox

“…While the AnAOB process is easily controlled whenever nitrite is available, PdN selection has become a critical step determining success of the PdN‐AnAOB approach (Kumar & Lin, ). Nitrite accumulation as indicator of PdN has been reported in many studies when fast carbon sources such as acetate (Du et al, ; Ge et al, ; Gong et al, ; Le et al, ; Van Rijn, Tal, & Barak, ; Yang, Wang, & Zhou, ) or glycerol (Baideme et al, ; Bill et al, ; Park, Brotto, Loosdrecht, & Chandran, ; Sharp et al, ; Uprety, ) were used for denitrification. Furthermore, other research also showed that COD/N ratio, pH, DO level, and SRT could be important factors impacting PdN performance (Almeida, Júlio, Reis, & Carrondo, ; Beccari, Passino, Ramadori, & Tandoi, ; Glass & Silverstein, ; Obaja, MacÉ, & Mata‐Alvarez, ).…”

Integrating waste activated sludge (WAS) acidification with denitrification by adding nitrite (NO2−)

“…The concentrations of atomic N as NO 2 À were 250 mg L À1 at both pH tested (Table 1), indicating that acidogenesis was inhibited. However, VFAs yields were still higher in these two fermentors (Table 1), in particular, acetic and propionic acids, the appropriate organic carbon sources for denitrification [9,28,29], accounted for more than 50% of detected VFAs. Other studies found that FNA also inhibited denitrifiers at the range of 0.01e0.025 mg L À1 as HNO 2 -N [30].…”

Emerging biological processes for municipal wastewater treatment

“…Due to the fact that cytochrome c or the quinol pool in the respiratory chain Emerging biological processes for municipal wastewater treatment 123 is the electron source for both nitrate and nitrite reductases (Chen & Strous, 2013), a low COD/N ratio of 2.0-3.0 generally may lead to a situation lacking electrons for further reduction of nitrite to nitric oxide (Table 4.2). As a result, nitrite accumulation is to be expected (Cao et al, 2017a;Du et al, 2016a;Gong et al, 2013). Moreover, other operational parameters, such as carbon source, hydraulic retention time (HRT), pH, nitrate etc., have all been examined for regulating nitrite accumulation (Figure 4.4).…”