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Anammox in a UASB reactor treating saline wastewater

Anammox in a UASB reactor treating saline wastewater,10.1016/j.psep.2011.05.001,Process Safety and Environmental Protection,Ren-Cun Jin,Chun Ma,Qaisar

Anammox in a UASB reactor treating saline wastewater  
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The feasibility of an anammox (anaerobic ammonium oxidation) UASB (upflow anaerobic sludge blanket) bioreactor to treat ammonium-rich brines was investigated in batch and continuous-flow experiments. The evidence from batch tests indicated that the anammox activity was significantly inhibited under highly saline conditions while the inhibition was reversible. Saline shock loading of 30gNaCll−1 caused a 67.5% decrease in specific anammox activity (SAA) compared to reference biomass (not exposed to salt). However, the acclimatized biomass displayed a SAA value just 45.1% lower than that of the reference biomass. When transferred from brine to freshwater, the salt-exposed biomass resumed its activity by 43.1%. Subsequent to appropriate acclimatization, careful manipulation nitrite concentration, nitrogen loading rate (NLR), and other operational parameters for 77 days, the results of continuous-flow experiment revealed that under the salinity of 30gNaCll−1 the reactor performed well and the substrate removal capacity (nitrogen removal rate, NRR, of 448±15mgl−1d−1) was comparable to the condition of freshwater (NRR of 464±13mgl−1d−1). However, the anammox UASB bioreactor was prone to malfunction under transient operating conditions.
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