Achieving nitrite accumulation in a continuous system treating low-strength domestic wastewater: switchover from batch start-up to continuous operation with process control

Peng, Yongzhen; Guo, Jianhua; Horn, Harald; Yang, Xiong; Wang, Shuying

doi:10.1007/s00253-011-3702-8

Cited by 28 publications

(13 citation statements)

References 50 publications

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“…The validity and applicability of the approach is confirmed using experimental data obtained with two independent wastewater treatment systems, including SBR 45 and CSTR 46 , respectively. Experimental data of the SBR related scenario were collected from two reactors with a working volume of 14 L. Both reactors were seeded with the same inoculum from a full-scale municipal WWTP, but operated in different modes 45 .…”

Section: Methodsmentioning

confidence: 59%

A Novel Protocol for Model Calibration in Biological Wastewater Treatment

Zhu¹,

Guo²,

Ni³

et al. 2016

Environmental Engineering and Activated Sludge Processes

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Activated sludge models (ASMs) have been widely used for process design, operation and optimization in wastewater treatment plants. However, it is still a challenge to achieve an efficient calibration for reliable application by using the conventional approaches. Hereby, we propose a novel calibration protocol, i.e. Numerical Optimal Approaching Procedure (NOAP), for the systematic calibration of ASMs. The NOAP consists of three key steps in an iterative scheme flow: i) global factors sensitivity analysis for factors fixing; ii) pseudo-global parameter correlation analysis for non-identifiable factors detection; and iii) formation of a parameter subset through an estimation by using genetic algorithm. The validity and applicability are confirmed using experimental data obtained from two independent wastewater treatment systems, including a sequencing batch reactor and a continuous stirred-tank reactor. The results indicate that the NOAP can effectively determine the optimal parameter subset and successfully perform model calibration and validation for these two different systems. The proposed NOAP is expected to use for automatic calibration of ASMs and be applied potentially to other ordinary differential equations models.A ctivated sludge is the most widely used biological technology for treating domestic and industrial wastewater. After its development with 100 years of history, many novel and modified processes have been developed to meet the more and more stringent discharge and emission limits. However, most of operating systems are suffering some drawbacks, such as substantial energy consumption, excessive greenhouse gas emission, and labour-intensive industry. As a powerful tool, Activated Sludge Models (ASMs) have proven to be very useful in process design, operation and optimization 1,2 . To date, ASMs for the simulation of biological nutrients removal processes have been updated from the first version of ASM1 to more complicated extensions, including ASM2, ASM2d, and ASM3 3 , and further to the extended ASM3s 4-10 in order to satisfy various requirements.However, ASMs are large and overparameterized models in terms of having many stoichiometric and kinetic parameters. Some of the model parameters as well as the model structure have to be adjusted, since microbial community structure and dominant species can vary in different wastewater treatment systems with different influent characteristics or operation schemes 6,7,[11][12][13][14] . In addition, the collected data from full-scale plants as well as pilot-or lab-scale reactors can hardly provide reliable estimations of all the parameters simultaneously due to the well-known problem of poorly identifiable parameters [15][16][17][18][19][20] . Thus, the approach to properly select the subsets of parameters for model calibration plays a crucial role on simulation results and model applications [21][22][23][24][25] . Until now, substantial studies have been conducted to develop effective model calibration approaches, which can be distinguished into two m...

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Section: Methodsmentioning

confidence: 59%

A Novel Protocol for Model Calibration in Biological Wastewater Treatment

Zhu¹,

Guo²,

Ni³

et al. 2016

Environmental Engineering and Activated Sludge Processes

Self Cite

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show abstract

“…Effective nitrite accumulation in the nitrification reactor could be influenced by a lot of factors, such as DO, pH, temperature, salinity and so on20. Among these factors, DO and pH were more widely investigated and could significantly affect nitrite accumulation in biological nitrification reactor21.…”

Section: Resultsmentioning

confidence: 99%

Biological Nitrogen Removal through Nitritation Coupled with Thiosulfate-Driven Denitritation

Qian

Zhou

Zhang

et al. 2016

Sci Rep

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A novel biological nitrogen removal system based on nitritation coupled with thiosulfate-driven denitritation (Nitritation-TDD) was developed to achieve a high nitrogen removal rate and low sludge production. A nitritation sequential batch reactor (nitritation SBR) and an anoxic up-flow sludge bed (AnUSB) reactor were applied for effective nitritation and denitritation, respectively. Above 75% nitrite was accumulated in the nitritation SBR with an influent ammonia loading rate of 0.43 kg N/d/m3. During Nitritation-TDD operation, particle sizes (d50) of the sludge decreased from 406 to 225 um in nitritation SBR and from 327–183 um in AnUSB reactor. Pyrosequencing tests revealed that ammonium-oxidizing bacteria (AOB) population was stabilized at approximately 7.0% (calculated as population of AOB-related genus divided by the total microbial population) in the nitritation SBR. In contrast, nitrite-oxidizing bacteria (NOB) population decreased from 6.5–0.6% over the same time, indicating the effective nitrite accumulation in the nitritation SBR. Thiobacillus, accounting for 34.2% in the AnUSB reactor, was mainly responsible for nitrogen removal via autotrophic denitritation, using an external source of thiosulfate as electron donor. Also, it was found that free nitrous acid could directly affect the denitritation activity.

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“…Since the dilute and cold conditions of mainstream are not well-suited for suppression of NOB, short-cut nitrogen removal, in particular deammonification, is yet to be implemented in full-scale. ScBNR via NO2 -pathway has been proven difficult in treating low N wastewater (Guo et al, 2009a) especially in continuous processes (Peng et al, 2012, Ma et al, 2009. Considering the difficulty of suppression of NOB in continuous mainstream processes, reports of successful nitritation are rare.…”

Section: Introductionmentioning

confidence: 99%

NOB Repression for Mainstream Nitrite-Shunt and Deammonification: A Pilot Study

Regmi¹,

Holgate²,

Bunce³

et al. 2013

proc water environ fed

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Highlights1) Short-cut nitrogen removal was demonstrated in a two-sludge NO2 --shunt process followed by AMX polishing at 25 ºC 2) An aeration control strategy was developed and implemented in the NO2 --shunt phase to produce an effluent with equal NOx-N and NH4 + -N 3) NOB suppression was realized in a single CSTR and maintained without using any external inhibitors at 25 ºC 4) Mainstream AMX polishing was demonstrated in an un-aerated MBBR 5) Mainstream NOB out-selection strategies and mechanisms have been suggested AbstractMainstream deammonification is regarded as a paradigm shift from the conventional aerobic wastewater treatment that is capable of promoting more sustainable nitrogen removal. It is understood that for deammonification to be successful in mainstream wastewater treatment, the suppression of NOB in the cold and dilute conditions associated with mainstream applications needs to be resolved. While NOB suppression in low C/N sidestreams is generally well understood, the mainstream application remains elusive. Since known factors that favor NOB suppression in sidestream such as high free NH3, high temperature, and free HNO2 are not available in mainstream, it has been recognized that operational strategies based on a different set of parameters are needed to suppress NOB. The prospect of mainstream deammonification in treatment plants that lack anaerobic digestion (e.g., incinerator plants) and therefore the potential for sidestream-generated ammonia oxidizing bacteria (AOB) bioaugmentation (without NOB) beckons an entirely different approach that might include separating the nitritation and anaerobic ammonia oxidation (AMX) steps. To prove the viability of mainstream NOB suppression and deammonification, a pilot study was conducted. The pilot study incorporates two unique stages operated in series, known as an A/B process. The A-stage included a low solids retention time (SRT), high-rate activated sludge (HRAS) process targeted at 30-60% influent chemical oxygen demand (COD) removal. The B-stage included a two-sludge deammonification process incorporating a Nitritation-Denitritation through Modulating Aeration (NiDeMA) CSTR with a clarifier followed by a fully-anoxic AMX moving bed bioreactor (MBBR). This paper considers the B-Stage, which includes the NiDeMA CSTR operated under cyclical dissolved oxygen (DO) conditions based on a control strategy applying on-line in-situ NH4 + , NO2 -, and NO3 -1959 WEFTEC 2013 measurements and an unaerated AMX MBBR. This aeration scheme combined with aggressive SRT limitation provided NOB suppression which was confirmed through weekly nitrogen processing rate measurements coupled with targeted qPCR of the bacterial community. The fully anoxic AMX MBBR has demonstrated near complete removal of NO2 -. Consequently, NOB suppression mechanisms have been postulated, and an operational framework has been put forward paving the way for mainstream deammonification in treatment plants that do not have anaerobic digestion.

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Achieving nitrite accumulation in a continuous system treating low-strength domestic wastewater: switchover from batch start-up to continuous operation with process control

Cited by 28 publications

References 50 publications

A Novel Protocol for Model Calibration in Biological Wastewater Treatment

A Novel Protocol for Model Calibration in Biological Wastewater Treatment

Biological Nitrogen Removal through Nitritation Coupled with Thiosulfate-Driven Denitritation

NOB Repression for Mainstream Nitrite-Shunt and Deammonification: A Pilot Study

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