A novel heterotrophic nitrifying and aerobic denitrifying bacterium, Zobellella taiwanensis DN-7, can remove high-strength ammonium

Abstract

A novel heterotrophic bacterium capable of heterotrophic nitrification and aerobic denitrification was isolated from ammonium contaminated landfill leachate and physiochemical and phylogenetically identified as Zobellella taiwanensis DN-7. DN-7 converted nitrate, nitrate, and ammonium to N2 as the primary end product. Single factor experiments suggested that the optimal conditions for ammonium removal were trisodium citrate as carbon source, C/N ratio 8, pH 8.0-10.0, salinity less than 3 %, temperature 30 °C, and rotation speed more than 150 rpm. Specifically, DN-7 could remove 1000.0 and 2000.0 mg/L NH4 (+)-N completely within 96 and 216 h, with maximum removal rates of 19.6 and 17.3 mg L(-1) h(-1), respectively. These results demonstrated that DN-7 is a promising candidate for application of high-strength ammonium wastewater treatments.

Nitrogen removal by a metal‐resistant bacterium, Pseudomonas putida ZN1, capable of heterotrophic nitrification–aerobic denitrification

“…Moreover, the trend of OD 600 peaks matches with that of maximum ammonium removal rate, and both the maximum values are obtained at 30 °C and reach separately 1.29 and 9.17 mg L −1 h −1 . As a result, 30 °C might be the optimum culture condition for ammonium removal by strain ZN1, which belongs to the optimal temperature range of most heterotrophic nitrifying‐aerobic denitrifying bacteria (25–37 °C) …”

“…As a result, 30 ∘ C might be the optimum culture condition for ammonium removal by strain ZN1, which belongs to the optimal temperature range of most heterotrophic nitrifying-aerobic denitrifying bacteria (25-37 ∘ C). 17,24,25 Dissolved oxygen Dissolved oxygen plays a major role in nitrification and denitrification processes. The concentration of dissolved oxygen in the medium was controlled by adjusting the shaking speed.…”

Removal of High-Strength of Ammonium and Phenol from Coking Wastewater by Alcaligenes faecalis No.4

“…When high-strength ammonium is involved in CW, COD in the wastewater is not sufficient to complete the removal of ammonium [1][2][3][4][5]. Recently, many bacteria have been known to be capable of heterotrophic nitrification and aerobic denitrification [6][7][8][9][10][11][12][13][14]. The use of these bacteria provides advantages over the conventional nitrogen removal process of aerobic nitrification and an anaerobic denitrification because ammonium removal is achieved in one reactor using one type of bacteria under aerobic conditions.…”

Enhanced nitrogen removal of low C/N wastewater using a novel microbial fuel cell (MFC) with Cupriavidus sp. S1 as a biocathode catalyst (BCS1)

“…To date, bacteria with this capability has been found extensively, namely Pseudomonas putida ZN1, Vibrio diabolicus SF16, Pseudomonas stutzeri YG‐24, Zobellella taiwanensis DN‐7 and Cupriavidus sp. S1 . The high total nitrogen (TN) removal efficiency of above 90% was usually obtained under aerobic condition.…”