Effects of temperature and mean cell residence time on biological nutrient removal processes

McClintock, Samuel A.; Randall, Clifford W.; Pattarkine, Vikram M.

doi:10.2175/wer.65.2.3

Cited by 43 publications

(30 citation statements)

References 2 publications

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“…Because stored polyphosphate and cations, mainly potassium and magnesium, were measured as MLSS, it was expected that lower MLVSS/MLSS ratios would be observed as the amount of P increased in the sludge. McClintock 18 reported an MLVSS/MLSS ratio of approximately 70% in a system with high amounts of P in the sludge (>10% P/VSS), and a ratio of 80% or greater in a system with low amounts of P in the sludge (<4% P/VSS).…”

Section: Effect Of C/p Ratio On Nitrogen Removal Efficiencymentioning

confidence: 99%

Nutrient removal performance of an anaerobic–anoxic–aerobic process as a function of influent C/P ratio

Peng

Wang

et al. 2005

J of Chemical Tech & Biotech

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The laboratory scale anaerobic-anoxic-aerobic (A 2 O) process fed with synthetic brewage wastewater was designed to investigate the effects of changing feed C/P ratio on the performance of biological nutrient removal (BNR) processes. In the experiment, the influent chemical oxygen demand (COD) concentration was kept at approximately 300 mg L −1 while the total phosphorus concentration was varied to obtain the desired C/P ratio. Results showed that when the C/P ratio was lower than 32, phosphorus removal efficiency increased as C/P ratio increased linearly, while when the C/P ratio was higher than 32, the P removal efficiency was maintained at 90-98%, and effluent P concentration was lower than 0.5 mg L −1 . However, regardless of the C/P ratio, excellent COD removal (90% or higher) and good total nitrogen removal (75-84%) were maintained throughout the experiments. It was also found that very good linear correlation was obtained between COD uptake per unit P released in the anaerobic zone and C/P ratio. In addition, the P content in the wasted activated sludge increased with the decrease in the C/P ratio. Based on the results, it was recommended that the wastewater C/P ratio and its effects be incorporated into BNR design and operational procedures, appropriate C/P ratios were used to achieve the effluent treatment goals.

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Section: Effect Of C/p Ratio On Nitrogen Removal Efficiencymentioning

confidence: 99%

Nutrient removal performance of an anaerobic–anoxic–aerobic process as a function of influent C/P ratio

Peng

Wang

et al. 2005

J of Chemical Tech & Biotech

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“…However, the results were inconsistent due to non-comparable experimental designs. Low temperature was reported to have an adverse impact on BPR efficiency (McClintock et al 1991;Mamais et al 1992). In other studies (Krichten et al 1985;Vinconneau et al 1985), better BPR was observed at lower temperatures (5 o C) than at higher temperatures (10 and 15 o C).…”

Section: Effect Of Temperaturementioning

confidence: 86%

Problems in Dairy Wastewater Treatment

Park¹,

Ahn²,

Whang³

et al. 2001

proc water environ fed

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Operational data from nine dairy wastewater plants in Wisconsin were collected and analyzed to determine reasons for frequent deterioration of biological phosphorus removal (BPR) efficiency and to optimize BPR for various wastewater treatment processes. Several major factors affecting BPR were identified from the data obtained from dairy wastewater treatment plants. First, many dairy wastewater treatment plants suffer low F/M ratios during off-days, leading to sludge bulking and unstable and poor BPR efficiency. Most dairies do not have an equalization tank or the size is inadequate to alleviate the fluctuation in flow and organic loading. Second, many dairy wastewaters are nutrient deficient. Currently, there are few plants adding ammonia or urea steadily and automatically. Third, many dairies have a severe pH swing within a matter of hours. Fourth, seasonal temperature variations are also found to have a significant effect on the microbial population, leading to the decrease in BPR efficiency. Fifth, frequent chemicals spills, notably brine solution, led to poor BPR as well as decreased COD removal efficiency. Last, the fluctuation in flow, organic loading, and pH magnified the impact to small anaerobic/anoxic tanks compared with large conventional continuously-stirred tank reactors. Laboratory-scale tests confirmed the effects of the COD/P ratio and pH on BPR efficiency. As the influent COD/P ratio increased, the phosphorous release during the anaerobic stage increased, resulting in improved BPR efficiency. When influent pH was greater than 8.5 under the condition tested, microorganisms lost their stability in a bench-scale batch test. Several suggestions for achieving stable and efficient BPR are provided.

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“…The average reactor temperature for the period was about 17.5 o C. Using the EPA (1993) recommended temperature correction equation for nitrification, the specific nitrification rate at 20 o C can be calculated as 2.2 mg N/g VSS/hr. At an aeration SRT of 6.8 days, this specific nitrification rate is located on the curve presented by McClintock et al (1993).…”

Section: Nitrification and Nitrogen Removalmentioning

confidence: 93%

A Study of a Nutrient Removal Modified Sequencing Batch Reactor

Yang¹,

McKinney²,

Mikkelson³

et al. 2001

proc water environ fed

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The Modified Sequencing Batch Reactor, MSBR ® system combines the advantages of a flowthrough activated sludge system and sequencing batch reactor technology. A nutrient removal MSBR system adds the features of biological nutrient removal to the activated sludge system. Additionally, thickening of return mixed liquor suspended solids combined with anaerobic mixed liquor flow splitting to the anoxic cells was developed in this study. The improved system achieved high removal efficiency for BOD 5 , COD, total nitrogen, and phosphorus.

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Effects of temperature and mean cell residence time on biological nutrient removal processes

Cited by 43 publications

References 2 publications

Nutrient removal performance of an anaerobic–anoxic–aerobic process as a function of influent C/P ratio

Nutrient removal performance of an anaerobic–anoxic–aerobic process as a function of influent C/P ratio

Problems in Dairy Wastewater Treatment

A Study of a Nutrient Removal Modified Sequencing Batch Reactor

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