Treatment of Ammonia Nitrogen Wastewater in Low Concentration by Two-Stage Ozonization

Treatment of Ammonia Nitrogen Wastewater in Low Concentration by Two-Stage Ozonization

Ammonia nitrogen wastewater (about 100 mg/L) was treated by two-stage ozone oxidation method. The effects of ozone flow rate and initial pH on ammonia removal were studied, and the mechanism of ammonia nitrogen removal by ozone oxidation was discussed. After the primary stage of ozone oxidation, the ammonia removal efficiency reached 59.32% and pH decreased to 6.63 under conditions of 1 L/min o...

Ammonia Wastewater Treatment by Immobilized Activated Sludge

Two-stage anaerobic process treating high concentration methanol wastewater and

In our study, two-stage anaerobic system was employed to treat high concentration methanol wastewater. The results showed the COD removal efficiency was over 90% at the volume loading of 26.8kgCOD/(m.d) and two-stage anaerobic digestion of methanol wastewater was more efficient and stabler than one stage. The pH of the two UASBs was always lower than 6.0, which wasn’t the suitable condition tha...

Ammonia Nitrogen Removal by Single-stage Process: A Review

Single-stage nitrogen removal from ammonium-rich streams has been studied extensively during the last decade in view of rising cost of traditional treatment methods and stringent discharge standards. This system has been developed under different names (DEMON, CANON, OLAND, SNAP and SNAD) to carry out simultaneous aerobic, anaerobic ammonium oxidizing and denitrification reactions in the same r...

Low-ammonia niche of ammonia-oxidizing archaea in rotating biological contactors of a municipal wastewater treatment plant

The first step of nitrification is catalysed by both ammonia-oxidizing bacteria (AOB) and archaea (AOA), but physicochemical controls on the relative abundance and function of these two groups are not yet fully understood, especially in freshwater environments. This study investigated ammonia-oxidizing populations in nitrifying rotating biological contactors (RBCs) from a municipal wastewater t...