Evaluation of autotrophic growth of ammonia-oxidizers associated with granular activated carbon used for drinking water purification by DNA-stable isotope probing

Effects of dynamic operating conditions on nitrification in biological rapid sand filters for drinking water treatment

“…Recent attention has been paid to the role of AOA in ammonium oxidation, although their quantitative contribution to ammonium oxidation in drinking water filters has yet to be determined (Niu et al, 2013). Based on an amoA based quantification, AOA and AOB were found to be nearly equally abundant in the filter, with AOA comprising 25% to 53% of the ammonium oxidizers (Fig.…”

“…In trickling filters with high ammonium concentrations (1.5-4.7 mg NH 4 -N L -1 ), de Vet et al (2011) reported minimal AOA contribution to ammonium oxidation. In GAC filters treating low levels of ammonium (< 0.1 mg NH 4 -N L -1 ), Niu et al (2013) concluded that AOA, and not AOB, were mainly responsible for ammonium oxidation. At an average inlet ammonium concentration of 0.1 mg NH 4 -N L -1 , it is debatable whether AOB or AOA support most of the ammonium oxidization.…”

“…Nitrification is a two-step biological process conducted by autotrophic bacteria and archaea (Niu et al, 2013). First ammonia-oxidizing bacteria (AOB) or archaea (AOA) oxidize ammonium to nitrite, which is then oxidized to nitrate by nitrite oxidizing bacteria (NOB).…”

Development of attapulgite composite ceramsite/quartz sand double-layer biofilter for micropolluted drinking source water purification

“…Ammonia removal in ACC/QSDLBF and QSSLBF during start-up phase Ammonia present in raw water is mostly in the form of ammonium (NH 4 ? -N), which increases the chlorine demand and acts as a precursor of trichloramine under some conditions, thereby yielding an undesirable odor and taste to potable water (Niu et al 2013). Indeed, the drinking water national standard (GB5749-2006) of China requests the ammonia concentration in tap water to a relatively low level (\0.5 mg/L).…”

Adsorption and transformation of ammonium ion in a loose-pore geothermal reservoir: Batch and column experiments

“…While heterotrophic nitrification generally occurs under a low pH condition (De and Kowalchuk, 2001;Ge et al, 2015;GutierrezZamora et al, 2015;Miller and Smith, 2009), the autotrophic aerobic nitrification of ammonium ion is a two-step process, carried out by two categories of chemolithotrophic microorganisms: ammonia-oxidizing bacteria (AOB) or archaea (AOA), and nitrite-oxidizing bacteria (NOB). In both steps oxygen is the electron acceptor (Niu et al, 2013). The process can be described by the following equation (Campos et al, 1999):…”