Control of aeration, aerobic SRT and COD input for mainstream nitritation/denitritation

Regmi, Pusker; Miller, Mark W.; Holgate, Becky; Bunce, Ryder; Park, Hongkeun; Chandran, Kartik; Wett, Bernhard; Murthy, Sudhir; Bott, Charles

doi:10.1016/j.watres.2014.03.035

Cited by 395 publications

(248 citation statements)

References 39 publications

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“…This strategy has been adopted for the treatment of both high-and lowammonium used water (Blackburne et al 2008;Fernandes et al 2013;Ruiz et al 2003). However, recent studies showed that higher DO of around 1.5 mg/L was still beneficial to (Cao et al 2013;Ge et al 2014;Regmi et al 2014). Using a tropical full-scale used water treatment plant in Singapore as the case study, Cao et al (2013) showed that 75 % of nitrite accumulation was achieved in the oxic units operated at the DO concentrations of 1.4-1.8 mg/L.…”

Section: Selective Retention Of Aob Against Nob: a Challenge Of Mainsmentioning

confidence: 99%

“…In general, the deammonification process can be classified as sidestream for high-ammonia used water (e.g., anaerobic digester liquor) and mainstream for low-ammonia used water (e.g., municipal used water). Large-scale application of the sidestream deammonification process has been widely reported (Lackner et al 2014), while the mainstream deammonification is being explored at its infancy stage (Regmi et al 2014;Wett et al 2013).…”

Section: Introductionmentioning

confidence: 99%

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The challenges of mainstream deammonification process for municipal used water treatment

Zhou

Qin

et al. 2015

Appl Microbiol Biotechnol

175

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The deammonification process combining partial nitritation and anaerobic ammonium oxidation has been considered as a viable option for energy-efficient used water treatment. So far, many full-scale sidestream deammonification plants handling high-ammonia used water have been in successful operation since Anammox bacteria were first discovered in the 1990s. However, large-scale application of this process for treating municipal used water with low ammonia concentration has rarely been reported. Compared to the sidestream deammonification process, the mainstream deammonification process for municipal used water treatment faces three main challenges, i.e., (i) high COD/N ratio leading to denitrifiers outcompeting Anammox bacteria, (ii) numerous difficulties in selective retention of ammonia-oxidizing bacteria (AOB) over nitrite-oxidizing bacteria (NOB), and (iii) sufficient accumulation of Anammox bacteria. Therefore, this paper attempts to provide a detailed analysis of these challenges and possible solutions towards sustainable mainstream deammonification process.

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Section: Selective Retention Of Aob Against Nob: a Challenge Of Mainsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The challenges of mainstream deammonification process for municipal used water treatment

Zhou

Qin

et al. 2015

Appl Microbiol Biotechnol

175

View full text Add to dashboard Cite

show abstract

“…The reader is referred to Regmi et al (2014) for detailed description of the pilot setup and operation. The AVN controlled process includes a single 340 L aeration tank operated as a continuously stirred tank reactor (CSTR) followed by a clarifier.…”

Section: Long Term Experimental Pilot Tests Hrsd Pilot Study -Avn Conmentioning

confidence: 99%

Population balance models: a useful complementary modelling framework for future WWTP modelling

Torfs

Ducoste

Vanrolleghem

et al. 2014

Water Science and Technology

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Population balance models (PBMs) represent a powerful modelling framework for the description of the dynamics of properties that are characterised by distributions. This distribution of properties under transient conditions has been demonstrated in many chemical engineering applications. Modelling efforts of several current and future unit processes in wastewater treatment plants could potentially benefit from this framework, especially when distributed dynamics have a significant impact on the overall unit process performance. In these cases, current models that rely on average properties cannot sufficiently capture the true behaviour and even lead to completely wrong conclusions. Examples of distributed properties are bubble size, floc size, crystal size or granule size. In these cases, PBMs can be used to develop new knowledge that can be embedded in our current models to improve their predictive capability. Hence, PBMs should be regarded as a complementary modelling framework to biokinetic models. This paper provides an overview of current applications, future potential and limitations of PBMs in the field of wastewater treatment modelling, thereby looking over the fence to other scientific disciplines.

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“…Highly efficient and stable nitrite accumulation is the first step (Peng and Zhu 2006;Wyffels et al 2004) The controlling parameters for nitrite accumulation include free ammonium (FA), free nitrous acid (FNA), dissolved oxygen (DO), SRT, and ammonium sludge load (Chuang et al 2007;Chen et al 2010;Vadivelu et al 2007). Shortening SRT to 1-3.5 days could facilitate NOB washout (Regmi et al 2014). DO level less than 1.0 mg/L is favorable for the inhibition of nitrite-oxidizing bacteria (NOB) (Kim et al 2008), and de Graaff et al (2010) indicated that DO of 1.5-1.7 mg/L was superior for nitrite accumulation in the treatment of high ammonium wastewater.…”

Section: Introductionmentioning

confidence: 99%

Response of nitrite accumulation and microbial community to free ammonia and dissolved oxygen treatment of high ammonium wastewater

Sui

Liu

Zhang

et al. 2016

Appl Microbiol Biotechnol

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The effects of free ammonia (FA) and dissolved oxygen (DO) on nitrite accumulation in the treatment of high ammonium wastewater and on the evolution of the microbial community were investigated. Under high DO conditions (3.75±0.49 mg/L), FA as high as 10.61±2.89 mg NH 3 /L maintained stable nitrite accumulation rate (NAR) of 84 % with NH 4 + -N load of 2.05 kg N/(m 3 day) at sludge retention time (SRT) of 15-18 days. After 56 days of operation, Proteobacteria and Nitrosomonas were the dominant phylum and genus, respectively; Nitrosomonas increased from 21.14 to 54.57 %. By contrast, under relative low DO and low FA, nitrite-oxidizing bacteria (NOB) were nearly eliminated (NOB/AOB of 0; ammonium-oxidizing bacteria (AOB)), and NAR of 94 % was achieved with lower NH 4 + -N load of 0.48 kg N/(m 3 day). DO correlated with AOB and NOB abundance, and FA decreased NOB activity and the NOB/AOB ratio. In conclusion, high FA and high DO conditions are optimal for efficient nitrite accumulation.

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Control of aeration, aerobic SRT and COD input for mainstream nitritation/denitritation

Cited by 395 publications

References 39 publications

The challenges of mainstream deammonification process for municipal used water treatment

The challenges of mainstream deammonification process for municipal used water treatment

Population balance models: a useful complementary modelling framework for future WWTP modelling

Response of nitrite accumulation and microbial community to free ammonia and dissolved oxygen treatment of high ammonium wastewater

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