Nitrogen transformations during aerobic/anoxic sludge digestion

Al-Ghusain, Ibrahim A.; Hamoda, Mohamed F.; El-Ghany, Mohamed N. Abd

doi:10.1016/s0960-8524(02)00087-1

Cited by 24 publications

(10 citation statements)

References 11 publications

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“…Data found in the bibliography show that values of between 2.86 and 5.07 kg CaCO 3 /kg N-NH 4 + should be used [12,13]. During the present study, bicarbonate was added to the feed wastewater (2.8 kg NaHCO 3 /m 3 ) to be used as a source of carbon by autotrophic microorganisms [14], thus favouring the nitrification process. The pH in the reactor ranged between 8.0 and 8.5.…”

Section: Study Of the Biodegradation Of Coke Wastewater With The Addimentioning

confidence: 90%

Simultaneous removal of phenol, ammonium and thiocyanate from coke wastewater by aerobic biodegradation

Vázquez

Rodríguez

Marañón

et al. 2006

Journal of Hazardous Materials

144

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Section: Study Of the Biodegradation Of Coke Wastewater With The Addimentioning

confidence: 90%

Simultaneous removal of phenol, ammonium and thiocyanate from coke wastewater by aerobic biodegradation

Vázquez

Rodríguez

Marañón

et al. 2006

Journal of Hazardous Materials

144

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“…The digesters were operated at 12 h aerobic and 12 h anoxic. According to Al-Ghusain et al, a 50% aerobic/50% anoxic A/A digestion daily cycle seems to be most suitable for process operation concerning biosolids reduction and nitrogen removal [1]. Air was pumped from the bottom of the reactor, ensuring the dissolved oxygen (DO) concentration maintained in the range 5.5 and 6.0mg/L.…”

Section: Aerobic/anoxic Digestion Processmentioning

confidence: 99%

“…Aerobic/anoxic digestion is a technology for reducing biosolids' volume and low removal rate at sewage treatment [1]. Many studies have been applied to improve degradation, including ultrasound [2,3], ball mill [4] and thermal [5] and microwave [6] treatment.…”

Section: Introductionmentioning

confidence: 99%

Ultrasonic Pretreatment for Performance in Aerobic/Anoxic Sludge Digestion

Zheng

Sun

et al. 2012

2012 International Conference on Biomedical Engineering and Biotechnology

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Effect of ultrasonic pretreatment on aerobic/anoxic sludge digestion was investigated. In the first part of this study , the ultrasonic conditions for sludge pretreatment was optimized with orthogonal experiment for achieving better biological activity and disintegration of sludge, then the influence of sonication on the aerobic/anoxic digestibility was studied. The results revealed that the optimal ultrasonic condition is 28kHz, 0.15W/mL for 10 min. The aerobic/anoxic digestion was improved by sonication, using ultrasonic irradiation with optimal parameters, the VSS removal efficiency at the optimal conditions was increased by 20.30%, and digestion time was shorten by 8 d, compared to the control.

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“…Maharaj and Elefsiniotis (2001) found that the VSS reduction increased from 50-74.6% during the anaerobic digestion of industrial and municipal wastewaters as the temperature was increased from 8-25°C. Al-Ghusain et al (2002) reported VSS concentrations of 4725 and 4549 mg L −1 during anaerobic sludge digestion at the temperatures of 30 and 40°C, respectively.…”

Section: ------------------------------------------------------------mentioning

confidence: 99%

Effect of Diurnally Cyclic Temperature on the Performance of a Continuous Mix Anaerobic Digester

Ghaly¹,

Hattab²

2011

American Journal of Biochemistry and Biotechnology

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Problem statement: Concentrated livestock production is a major contributor to environmental problems through the production of large quantity of husks on relatively small land area. Anaerobic digestion represents a valuable means of cover by these husks into methane while reducing manure pollution problems. Methodology: An experimental apparatus, including data acquisition and control system, was developed and used to investigate the effects of two diurnally cyclic temperature ranges (20-40 and 15-25°C) and four levels of hydraulic retention times (25, 20, 15 and 10 d) on the performance of anaerobic reactors operated on screened dairy manure. Results: The reactor temperature exhibited a lag relative to the chamber temperature. For the 20-40°C temperature cycles, the average lag at the maximum chamber temperature was 3.75 h while the lag at the minimum chamber temperature was 4.37 h. For the 15-25°C temperature cycle, the average lag at maximum chamber temperatures was 3.61 while the lag of the minimum chamber temperature was 4.34 h. The effluent solids content, total Kjeldahl nitrogen and ammonium nitrogen concentrations were not adversely affected by the reactor diurnally cyclic temperature. The observed values of these parameters compared fairly well with the values obtained by other researchers. The effluent total solids, volatile suspended solids, TKN, NH 4 -N and methane content of the biogas diurnally cyclic patterns were out of phase with the diurnally cyclic pattern of the reactor temperature by about 12 h under most of the investigated operating conditions. The pH and the carbon dioxide content of the biogas all exhibited a diurnally cyclic pattern which was in phase with the reactor diurnally cyclic temperature. The reductions in total solids, total suspended solids, fixed suspended solids, total Kjeldahl nitrogen, ammonium nitrogen and methane yield were all significantly affected by the diurnal temperature range and hydraulic retention time. Conclusion: The measured reactor pH followed a diurnally cyclic pattern which was in phase with the reactor temperature. At the operating temperature cycle of 20-40°C, the reactor pH ranged from 6.80-7.54 while VFA concentration ranged from 44.7-154.8 mg L .

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Nitrogen transformations during aerobic/anoxic sludge digestion

Cited by 24 publications

References 11 publications

Simultaneous removal of phenol, ammonium and thiocyanate from coke wastewater by aerobic biodegradation

Simultaneous removal of phenol, ammonium and thiocyanate from coke wastewater by aerobic biodegradation

Ultrasonic Pretreatment for Performance in Aerobic/Anoxic Sludge Digestion

Effect of Diurnally Cyclic Temperature on the Performance of a Continuous Mix Anaerobic Digester

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