Low-dissolved-oxygen nitrification in tropical sewage: an investigation on potential, performance and functional microbial community

Water Science and Technology : a Journal of the International Association on Water Pollution Research
S W HowA S M Chua

Abstract

Intensive aeration for nitrification is a major energy consumer in sewage treatment plants (STPs). Low-dissolved-oxygen (low-DO) nitrification has the potential to lower the aeration demand. However, the applicability of low-DO nitrification in the tropical climate is not well-understood. In this study, the potential of low-DO nitrification in tropical setting was first examined using batch kinetic experiments. Subsequently, the performance of low-DO nitrification was investigated in a laboratory-scale sequential batch reactor (SBR) for 42 days using real tropical sewage. The batch kinetic experiments showed that the seed sludge has a relatively high oxygen affinity. Thus, the rate of nitrification was not significantly reduced at low DO concentrations (0.5 mg/L). During the operation of the low-DO nitrification SBR, 90% of NH4-N was removed. The active low-DO nitrification was mainly attributed to the limited biodegradable organics in the sewage. Fluorescence in-situ hybridisation and 16S rRNA amplicon sequencing revealed the nitrifiers were related to Nitrospira genus and Nitrosomonadaceae family. Phylogenetic analysis suggests 47% of the operational taxonomic units in Nitrospira genus are closely related to a comammox bacter...Continue Reading

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Citations

Apr 26, 2020·Water Science and Technology : a Journal of the International Association on Water Pollution Research·Jianfeng WenWendong Tao
Apr 16, 2020·Water Science and Technology : a Journal of the International Association on Water Pollution Research·Seow Wah HowAdeline Seak May Chua

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