Influence of operational parameters on nitrogen removal efficiency and microbial communities in a full-scale activated sludge process

Kim, Young Beom; Cho, Hyun Uk; Lee, Dong Hoon; Park, Donghee; Park, Jong

doi:10.1016/j.watres.2011.08.063

Cited by 91 publications

(38 citation statements)

References 35 publications

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“…As a result of this initiative a new Sewage Treatment Plant (STP-Phase IV) having capacity of 10 million gallons per day (mgd) based upon the activated sludge process (ASP) was established in Sector I-9 of Islamabad in 2009 [2]. ASP is a well established and proven wastewater treatment technique [7] and one of the most widely used biological treatments of wastewaters containing carbon and nitrogen pollutants [8].…”

Section: Introductionmentioning

confidence: 99%

“…Research targeting a full-scale wastewater treatment process (WWTP) has rarely been attempted and results from lab scale experiments have proved difficult to extrapolate to real WWTP conditions [8]. One of the major issues when carrying out this study was that since a full scale plant treating urban wastewater was utilized, any applied control strategy had to meet the legal effluent discharge standards, i.e., NEQS for this plant.…”

Section: Introductionmentioning

confidence: 99%

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Influence of Temperature on the Performance of a Full-Scale Activated Sludge Process Operated at Varying Solids Retention Times Whilst Treating Municipal Sewage

Shahzad

Khan

Paul

2015

Water

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Abstract:In this study, the solid retention time (SRT) was varied with the ambient temperature for a full-scale municipal activated sludge plant with capacity of 200,000 PE (Population Equivalent) located in a humid sub-tropical environment. The effects of ambient temperature on treatment performance were investigated. Off-line samples were collected and analyzed from the treatment plant. The actual temperature variation during the study period was divided into three overlapping ranges and the SRT was adjusted accordingly with temperature in order to achieve the desired effluent quality. The plant's observed effluent quality and thereby its overall removal efficiency was evaluated in terms of measuring standard biochemical parameters. The results indicate that significant improvement in effluent quality can be obtained by applying the variable SRT (5-7 days) dependent on temperature variation.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Influence of Temperature on the Performance of a Full-Scale Activated Sludge Process Operated at Varying Solids Retention Times Whilst Treating Municipal Sewage

Shahzad

Khan

Paul

2015

Water

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“…Tolerant plants and soil media are used to treat wastewater efficiently at low-energy consumption. The corporate function of plants, soil media and microorganisms can produce effluent which removes more nitrogen than the effluent produced by conventional WWTPs (Vymazal 2007(Vymazal , 2011Kim et al 2011).…”

Section: Introductionmentioning

confidence: 99%

Study of nitrogen removal performance in pilot-scale multi-stage vermi-biofilter: operating conditions impacts and nitrogen speciation transformation

et al. 2015

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The present work investigates pollutant removal and the transformation of nitrogen from sewage wastewater using a pilot-scale multi-stage bio-vermifilter system. Over a study period of 48 weeks, the pollutant removal performance of the system was measured and the effects of hydraulic loading rate (HLR) and dry-wet ratio (D/W) were estimated. The relationship between oxygen transfer rate and load of oxygen necessity was calculated and analysed for system optimisation. The method for diluting the isotope d 15 N-NO 3 -was applied to study nitrogen transfer. Moreover, statistical correlations were analysed to determine the crucial factors which influence nitrogen transfer efficiency. The system removes pollutants efficiently; specifically, the average removal efficiencies are 94.2 % for chemical oxygen demand (COD), 93.3 % for NH 4 ? -N, and 58.2 % for total nitrogen (T-N). Lowering HLR and D/W can enhance nitrogen removal. Nitrogen speciation and transformation were examined under an optimised condition with an HLR of 0.36 m day -1 and a D/W of 3. The results of isotope d 15 N-NO 3 -dilution showed that NO 3 --N was mainly produced in trickling bio-filter and vermibio-filter (VBF)

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“…This shift may result in loss of microbial populations which need to be replenished in order for the system to recover its functional ability . Thus, efficient nitrification in engineered systems such as MBR depends on a combination of environmental and operational parameters which include pH, temperature (Gerardi 2002;Kim et al 2011) DO and substrate concentration (Bae et al 2002;Liu et al 2010a) and the presence of inhibitory or toxic substances (Ç eçen et al 2010). …”

Section: Ammonia-oxidizing Archaea (Aoa): the New Player In Mbr Nitrimentioning

confidence: 99%

Ecophysiology of nitrifying communities in membrane bioreactors

Awolusi

Kumari

Bux

2014

Int. J. Environ. Sci. Technol.

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Membrane bioreactors (MBRs) are rapidly becoming the technology of choice over conventional activated sludge treatment systems due to their smaller footprint, reduced sludge production, rapid start-up of biological processes, complete removal of suspended solids and better effluent quality. The retention of sufficient amount of slow-growing nitrifiers makes it feasible for the MBRs to achieve strong tolerance against the shock loads with stable and highly efficient nitrogen removal. Various studies have focused on the ecophysiology of nitrifiers in MBRs as well as their distinctive operational parameters as well as their impact on the selection and activity of nitrifying community. Several techniques have been employed over the years to understand the nitrifying community and their interaction within the MBR system, which led to its modification from the initial design. This review focuses on the identification of optimal operational and environmental conditions for efficient nitrification in MBRs. The advantages and limitations of different techniques employed for investigating the nitrifying communities in MBRs are also emphasized.

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Influence of operational parameters on nitrogen removal efficiency and microbial communities in a full-scale activated sludge process

Cited by 91 publications

References 35 publications

Influence of Temperature on the Performance of a Full-Scale Activated Sludge Process Operated at Varying Solids Retention Times Whilst Treating Municipal Sewage

Influence of Temperature on the Performance of a Full-Scale Activated Sludge Process Operated at Varying Solids Retention Times Whilst Treating Municipal Sewage

Study of nitrogen removal performance in pilot-scale multi-stage vermi-biofilter: operating conditions impacts and nitrogen speciation transformation

Ecophysiology of nitrifying communities in membrane bioreactors

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