Effect of ammonia nitrogen mass concentration on anaerobic digestion process for treating light industrial wastewater under normal and low temperature
Anaerobic digestion process was established in the Up-flow Anaerobic Sludge Blanket(UASB).The study focused on the effect of ammonia nitrogen mass concentration on the performance of anaerobic digestion process for treating light industrial wastewater under normal and low-temperature conditions(<25℃).The results showed that intermitting sludge addition and controlling the reflux ratio of 7.5 were beneficial for the start-up of the anaerobic digestion process.Ammonia nitrogen mass concentration ranging from 400～1400 mg/L had no adverse effect on anaerobic digestion performance,while that in 400～800 mg/L slightly promoted anaerobic digestion per-formance.However,the higher ammonia nitrogen mass concentration led to the death of some microorganisms and an increase of the extracellular polymeric substance and soluble microbial products.In addition,the increase of ammonia nitrogen mass concentration was not conducive to the growth of hydrogenotrophic Methanobacterium.The relative abundance of Methanobacterium decreased from 75.5%to 6.3%.However,it was beneficial to the prolif-eration of acetotrophic Methanosaeta and facultative Methanosarcina and their relative abundances increased from 19.8%and 1.7%to 63.8%and 29.1%,respectively.Under normal and low temperature conditions,anaerobic digestion process could treat high COD light industrial wastewater with ammonia nitrogen mass concentration of 0～1400 mg/L,but the dominant methanogenic archaea would undergo significant revolution.
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