Effect of alum on nitrification during simultaneous phosphorous removal in anoxic/oxic reactor

Banu, J. Rajesh; Do, Khac‐Uan; Kaliappan, S.; Yeom, Ikjun

doi:10.1007/s12257-008-0279-x

Cited by 15 publications

(3 citation statements)

References 19 publications

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“…In other words, the addition of the external carbon source -1 in Run 1 and 0.7 and 0.9 mg l -1 in Run 2. The present study recorded high phosphorous removal efficiency when compared to other similar systems used to treat domestic wastewater (Rajesh et al 2008;Yu and Zhou 2010). The improvement of phosphorous removal is likely due to the use of UCT-like recirculation which is beneficial for PAO organisms and subsequent phosphorous removal.…”

Section: Sludge Characteristicssupporting

confidence: 54%

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Effects of sludge pretreatment on sludge reduction in a lab-scale anaerobic/anoxic/oxic system treating domestic wastewater

Uan

Yeom

Arulazhagan

et al. 2012

Int. J. Environ. Sci. Technol.

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Excess sludge disposal is one of the serious challenges in biological wastewater treatment. Reduction of sludge production would be an ideal way to solve sludgeassociated problems rather than the post-treatment of the sludge produced. In this study, a new wastewater treatment process combining anaerobic/anoxic/oxic system with thermochemical sludge pretreatment was tested in a laboratory scale experiment. In this study, the effects of the sludge pretreatment on the excess sludge production in anaerobic/anoxic/oxic were investigated. The system was operated in two Runs (1 and 2). In Run 1, the system was operated as a reference and in Run 2, a part of the mixed liquid was pretreated thermochemically and was returned to the bioreactor. The average solubilization efficiency of pretreated sludge was found to be about 35 % during the study period of 220 days. Sludge production rate in Run 2 was less than that in Run 1 by about 52 %. Total phosphorous was removed by enhanced biological phosphorous removal with the removal efficiency of 83-87 % and 81-83 % for Run 1 and Run 2, respectively. Total nitrogen removal in Run 2 (79-82 %) was slightly higher than that in Run 1 (68-75 %). The mixed liquor suspended solids/ mixed liquor volatile suspended solids ratio was identical after both runs in the range 78-83 %. The effluent water qualities were not significantly affected when operated with thermochemical pretreatment at pH 11 and 60°C for 3 h during 7 months. From the present study it is concluded that thermochemical sludge pretreatment of anaerobic/anoxic/ oxic process plays an important role in reduction of sludge production.

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Section: Sludge Characteristicssupporting

confidence: 54%

“…It was basically composed of a mixed carbon source, macronutrients (N and P), an alkalinity control (NaHCO 3 ) and a microelement solution (Rajesh et al 2008 and TP of 5.0 ± 0.1 mg l -1 with pH 6-7. The sludge from aerobic basin was withdrawn at a flow rate of 2 % Q.…”

Section: Methodsmentioning

confidence: 99%

Effects of sludge pretreatment on sludge reduction in a lab-scale anaerobic/anoxic/oxic system treating domestic wastewater

Uan

Yeom

Arulazhagan

et al. 2012

Int. J. Environ. Sci. Technol.

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“…Do et al (2013) conducted the study with the main objective to investigate the influence of sludge pretreatment on the nitrification rate and found that the nitrogen removal efficiency reduced from 85 to 74%. Moreover, similar results are also coherent with other authors (Banu et al 2008(Banu et al , 2009.…”

Section: N-mineralization Of Compostsupporting

confidence: 93%

Humification of poultry waste and rice husk using additives and its application

Mushtaq

Iqbal

Khalid³

et al. 2018

Int J Recycl Org Waste Agricult

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Purpose The purpose of this study was to assess the efficacy of inorganic additives during the humification of poultry waste and rice husk. Methods Poultry waste mixture was treated with aluminum sulfate 3% and rock phosphate 2% during co-composting of mixture in mechanical composter and evaluated the potential of humification and compost nitrogen mineralization in incubation and pot study. Results The mesophilic to thermophilic phase of composting mixture is prolonged due to the rise in temperature, pH and ammonia that steadily decrease near the maturation phase. The humification rate (HR), humification index (HI), degree of polymerization (DP) and cation exchange capacity (CEC) increased in enriched compost as compared to unenriched with the composting process. The germination index (GI) of enriched compost (C/N:10.8) was significantly greater than unenriched compost (C/N:23.43). These all maturity indices, i.e., C/N, CE, HI, DP, HR revealed the significant correlation with each other. In the incubation study, nitrogen mineralization was also evaluated and nitrogen was applied at the rate of 50 kg-N/ha using the enriched and unenriched compost and found high mineralization in enriched compost due to low C/N. A laboratoryscale pot experiment was also conducted, applied the compost at a rate of 100 kg-N/ha and recorded the encouraging results in growth and nutrition value of Abelmoschus esculentus plant. Conclusion It was concluded that use of additives have a significant impact on humification of poultry waste.

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