Recent advancements in the biological treatment of high strength ammonia wastewater

Evaluating fixed-film nitrification systems in autotrophic mode: enhanced biomass retention does not improve bioreactor performance during alkalinity induced stress

“…In this sense, these tests could be viewed as simulated ammonia shock load events, since the prevailing ammonia concentration in each bioreactor prior to conversion to batch mode was presumably The energy required to maintain continuous aeration is often one of the largest costs associated with the operation of BNR systems and reducing the energy demand is a major focus of ongoing research and development. 38 Hence, the batch experiment was repeated with and without continuous aeration to determine whether any advantage associated with higher biomass retention would persist in the absence of continuous aeration. The biomass concentration in each bioreactor had an important impact on the ammonia removal rate during batch mode operation when aeration and mixing was maintained, with CSTR-H demonstrating the fastest ammonia removal rate, followed by CSTR-M, and CSTR-C (Fig.…”

Quantum Mechanical Versus Polarizable Embedding Schemes: A Study of the Xray Absorption Spectra of Aqueous Ammonia and Ammonium

“…Another point of interest is the rapid rotation of ammonia in liquid water, which has been under debate for several years . Ammonia and ammonium are also known in the context of wastewater treatment as the primary forms of inorganic nitrogen . Moreover, ammonia solution has emerged as a potentially effective CO 2 absorbent, , an important feature in times of increasing environmental pollution.…”

Nitrospira dominant pin-point flocs with granule-like settleability in stirred tank reactors with oxic/hypoxic/oxic zones

“…Ammonia, produced as a by-product in various domestic and industrial sources, such as agricultural and commercial processes, when released into the environment can lead to effects on human and ecosystem health ( Soler et al, 2021 ). The ineffective removal of ammonia in wastewater treatment can result in eutrophication, as a result of increasing populations, and subsequently reducing oxygen levels that harm aquatic ecosystems ( Ronan et al, 2021 ).…”

“…Nitrification is a bottleneck in ammonia removal processes because nitrifiers compete with the heterotrophs for space and nutrients in the outer layers of biofilms and flocs. Autotrophic nitrifiers are slow-growing and are more prone to washout ( Aqeel et al, 2019 ; Ronan et al, 2021 ; Christiaens et al, 2022 ). It has been reported that the proportion of nitrifying bacteria in wastewater treatment systems is as low as 0.4%, which is below the detection limit of certain molecular techniques such as dot blot and DNA hybridization ( Dionisi et al, 2002 ).…”