Biological Nitrogen Removal Database

A manually curated data resource for microbial nitrogen removal


Anammox


Experimental setup


Influent:Synthetic wastewater

Anammox system:nan

Anammox reactor:Membrane sequencing batch reactor (MSBR)

Medium:Hollow fibre membrane module

Culture taken from:Anammox biomass

Microorganism cultured:nan

Respiration:Anaerobic

Electron donor:Ammonium sulfate ((NH4)2SO4)

Electron acceptor:Sodium Nitrite (NaNO2)

PH:7.8–8.7

Maximum sludge concentration:0.4

HRT:1 d

NH4–N Influent conc(mg/L):75.3–283.4

NO2–N Influent conc(mg/L):83.7–315.4

SO4–S Influent conc(mg/L):nan


Experimental Information


NH4–N Removal efficiency (%):73.6

NO2–N Removal efficiency (%):nan

SO4-S Removal efficiency (%):nan

NLR kg-N/m3/d:0.7

NRR kg-N/m3/d:0.7


Information about Article


Major findings:Salts precipitation on the biomass surface interferes with microbial activity and caused a decrease of the nitrogen removal rate. The MSBR could be a suitable system for nitrogen removal using Anammox biomass. Either biomass wash-out or contact with air were avoided by the use of the membrane. The system maintained a good activity even during periods in which a little amount of nitrite accumulated and sporadic sludge buoyancy was detected. Nitrite accumulation was removed by stopping the feeding during an operating cycle.

Authors:Trigo et al., 2006

Title:Start-up of the Anammox process in a membrane bioreactor

Pubmed link:Link

Full research link:Link

Abstract:The start-up of an Anammox process was studied in a membrane sequencing batch reactor (MSBR) in which a submerged hollow fibre membrane module was used to retain the biomass. The reactor was seed with Anammox biomass and fed using the Van de Graaf medium. During a first operating stage, salt precipitation was observed and interfered with microbial activity and caused a decrease of the nitrogen removal rate of the reactor from 100 to only 10 mgl(-1) per day. Salt precipitation was avoided by diminishing adequately the Ca and P concentrations of the Van de Graaf medium during the last operating stage. This action increased quickly the activity of the system, and nitrogen removal rate reached up to 710 mgl(-1) per day with almost full nitrite removal. Sporadic flotation of the sludge was observed in the MSBR. The use of the membrane avoided biomass wash-out from the system. Moreover, a surprising fact was that Anammox biomass did not grow in flocs in the MSBR, but in granules. This fact showed that this kind of microorganisms have a trend to grow in aggregates. Results indicated that the use of the MSBR could be a suitable system for nitrogen removal by using the Anammox reaction.