Combined Anaerobic/Aerobic Digestion: Effect of Aerobic Retention Time on Nitrogen and Solids Removal

Jongmin Kim; Novak, John T.
September 2011
Water Environment Research (10614303);Sep/Oct2011, Vol. 83 Issue 9/10, p802
Academic Journal
A combined anaerobic/aerobic sludge digestion system was studied to determine the effect of aerobic solids retention time (SRT) on its solids and nitrogen removal efficiencies. After the anaerobic digester reached steady state, effluent from the anaerobic digester was fed to aerobic digesters that were operated at 2- to 5-day SRTs. The anaerobic system was fed with a mixture of primary and secondary sludge from a local municipal wastewater treatment plant. Both systems were fed once per a day. The aerobic reactor was continuously aerated with ambient air, maintaining dissolved oxygen level at 1.1 ± 0.3 mg/L. At a 4-day or longer SRT, more than 11% additional volatile solids and 90% or greater ammonia were removed in the aerobic digester, while 32.8 mg-N/L or more nitrite/nitrate also was measured. Most total Kjeldahl nitrogen removal was via ammonia removal, while little organic nitrogen was removed in the aerobic digester.


Related Articles

  • EXPERIENCES GAINED IN THE OPERATION OF ANAEROBIC TREATMENT PLANTS IN GERMANY. Austermann-Haun, U.; Seyfried, C. F. // Water Science & Technology;1994, Vol. 30 Issue 12, p415 

    In the western part of Germany there are 77 full scale anaerobic treatment plants treating industrial wastewater. The ISAH (Institut fur Siedlungswasserwirtschaft und Abfalltechnik at the University of Hannover) is or was involved in the investigations, the design and/or operation of 14 of these...

  • Tracking influent inorganic suspended solids through wastewater treatment plants. Ekama, G. A.; Wentzel, M. C.; Sötemann, S. W. // Water Science & Technology;2006, Vol. 54 Issue 8, p101 

    From an experimental and theoretical investigation of the continuity of influent inorganic suspended solids (ISS) along the links connecting the primary settling tank (PST), fully aerobic or N removal activated sludge (AS) and anaerobic and aerobic sludge digestion unit operations, it was found...

  • Enhanced biological phosphorus removal in the retrofitting from an anoxic selector to an anaerobic selector in a full-scale activated sludge process in Singapore. Cao, Y.; Ang, C. M.; Chua, K. C.; Woo, F. W.; Chi, H.; Bhawna, B.; Chong, C. T.; Ganesan, N.; Ooi, K. E.; Wah, Y. L. // Water Science & Technology;2009, Vol. 59 Issue 5, p857 

    This paper presents the investigation results of retrofitting an anoxic selector to an anaerobic selector through stepwise reduction of air supply in a full-scale activated sludge process with a focus on enhanced biological phosphorus removal (EBPR). The process experienced gradual shift from a...

  • Denitrification of Wastewater Using Sludge and Methanol as a Carbon Source. S., Dholam Sujit; B., Attarde S.; D., Wagh N.; T., Ingale S. // Universal Journal of Environmental Research & Technology;2014, Vol. 4 Issue 3, p172 

    External carbon sources can enhance denitrification rates and thus improve nitrogen removal in wastewater treatment plants. When external carbon sources are added, no severe effect could be observed from an operational point of view. Denitrification is a process in which the oxidized nitrogen...

  • Ammonia volatilisation in waste stabilisation ponds: a cascade of misinterpretations? Valero, M. A. Camargo; Mara, D. D. // Water Science & Technology;2010, Vol. 61 Issue 3, p555 

    Ammonia volatilisation has generally been reported as, or assumed to be, the main nitrogen removal mechanism in waste stabilisation ponds (WSP). Nitrogen removal via ammonia volatilisation is based on two observations: (a) in-pond pH values can reach high values (>9, even >10), so increasing the...

  • Sequential anaerobic/anaerobic digestion for enhanced sludge stabilization: comparison of the process performance for mixed and waste sludge. Tomei, M.; Carozza, Nicola // Environmental Science & Pollution Research;May2015, Vol. 22 Issue 10, p7271 

    Sequential anaerobic-aerobic digestion has been demonstrated as a promising alternative for enhanced sludge stabilization. In this paper, a feasibility study of the sequential digestion applied to real waste activated sludge (WAS) and mixed sludge is presented. Process performance is evaluated...

  • Sewage wastewater treatment plant inverted AAO process design. Wang Li // Advanced Materials Research;2014, Vol. 1079/1080, p480 

    The graduation design topic for a sewage treatment plant processes design - inverted AAO process in durian. Main task is tantamount to design according to the requirement of the nature of the city sewage, sewage, scale preliminary design to complete sewage treatment plant and single processing...

  • Difficulties in maintaining long-term partial nitritation of ammonium-rich sludge digester liquids in a moving-bed biofilm reactor (MBBR). Fux, C.; Huang, D.; Monti, A.; Siegrist, H. // Water Science & Technology;2004, Vol. 49 Issue 10, p53 

    Nitrogen can be eliminated effectively from sludge digester effluents by anaerobic ammonium oxidation (anammox), but 55-60% of the ammonium must first be oxidized to nitrite. Although a continuous flow stirred tank reactor (CSTR) with suspended biomass could be used, its hydraulic dilution rate...


    The article provides information on California's wastewater reforms while conserving the environment. It cites Kerman where the wastewater division showcases solar energy and Antioch where the Delta Diablo Sanitation District converts nitrogen from wastewater into a renewable energy source....


Read the Article


Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics