Strategies for enhanced deammonification performance and reduced nitrous oxide emissions.

Deammonification's performance and associated nitrous oxide emissions (NO) depend on operational conditions. While studies have investigated factors for high performances and low emissions separately, this study investigated optimizing deammonification performance while simultaneously reducing NO emissions. Using a design of experiment (DoE) method, two models were developed for the prediction of the nitrogen removal rate and NO emissions during single-stage deammonification considering three operational factors (i.

Photoacoustic Spectroscopy for the Quantification of NO in the Off-Gas of Wastewater Treatment Plants.

Different configurations of photoacoustic (PA) setups for the online-measurement of gaseous NO, employing semiconductor lasers at 2.9 and 4.5 μm, were developed and tested.

Unexpected Diversity and High Abundance of Putative Nitric Oxide Dismutase (Nod) Genes in Contaminated Aquifers and Wastewater Treatment Systems.

Unlabelled: It has recently been suggested that oxygenic dismutation of NO into N and O may occur in the anaerobic methanotrophic "Candidatus Methylomirabilis oxyfera" and the alkane-oxidizing gammaproteobacterium HdN1. It may represent a new pathway in microbial nitrogen cycling catalyzed by a putative NO dismutase (Nod). The formed O enables microbes to employ aerobic catabolic pathways in anoxic habitats, suggesting an ecophysiological niche space of substantial appeal for bioremediation and water treatment.

The role of residual quantities of suspended sludge on nitrogen removal efficiency in a deammonifying moving bed biofilm reactor.

In a moving bed biofilm reactor (MBBR) system, the vast majority of biomass is immobilized as biofilm besides small amounts of suspension. In this study, the influence of the individual biomass components of a deammonifying MBBR, the biofilm on carriers (BC), residual suspended biomass (SB) with a volatile suspended solids concentration of 0.09±0.