Partial nitrification to nitrite for treating ammonium-rich organic wastewater by immobilized biomass system

Yan, Jia; Hu, Yong

doi:10.1016/j.biortech.2008.11.038

Cited by 62 publications

(18 citation statements)

References 23 publications

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“…However, it is worth to notice that during continuous experiment immobilization would positively affect the stability of the process and will provide some protection from adverse pH, temperatures and toxic shocks [23]. Yan and Hu [24] studied partial nitrification to nitrite for treating ammonium-rich organic wastewater by immobilized biomass system. The effect of pH and temperature on partial nitrification was evidently weakened in sodium alginate immobilized biomass beads.…”

Section: Discussionmentioning

confidence: 99%

Immobilization of Anammox biomass in sodium alginate

2018

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Abstract. Anaerobic ammonium oxidation (anammox) is a process of ammonium and nitrite conversion into nitrogen gas. Nowadays, anammox is applied into many wastewater treatment plants worldwide. However, anammox bacteria are characterized by a slow growth rate, which may cause problems in maintaining the biomass in the system. The promising technique which can help to maintain the biomass in the reactor and effectively prevent loss of anammox bacteria from a system is immobilization. Selection and optimization of the appropriate immobilization technique for investigated biomass is crucial for conducting an effective process. One of the ways for bacteria immobilization is gel entrapment. The main goal of the study was to test sodium alginate as an immobilization medium for anammox biomass. In the present study procedure of immobilization in sodium alginate was optimised, then the mechanical and chemical properties of the obtained pellets were investigated. Series of batch experiments revealed that immobilized anammox biomass was able to remove ammonia and nitrite nitrogen effectively. The calculated specific anammox activity (SAA) for immobilized anammox biomass was 0.18 g N·gVSS -1 ·d -1 , while for nonimmobilized biomass was 0.36 g N·gVSS -1 ·d -1 .

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Section: Discussionmentioning

confidence: 99%

Immobilization of Anammox biomass in sodium alginate

2018

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“…The complete nitrification was expected at the DO concentration of above 1.7 mg/L in conventional activated sludge processes. [11] However, the excessive aeration may result in the decrease in ammoniaoxidizing bacteria (AOB) activity [12] and TP removal. [13] In this study, when DO was kept to about 2.0 mg/L, the quality of the the effluent was acceptable according to the top most requirement of discharge standard of pollutants for municipal wastewater treatment plant (GB18918-2002) in China.…”

Section: Effect Of Dissolved Oxygen On the Performance Of The Integramentioning

confidence: 99%

Simultaneous removal of nitrogen, phosphorus and COD in an integrated OCO reactor

Mao

Liu

et al. 2014

Environmental Technology

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An integrated OCO reactor with two side-ditch separators based on the anaerobic/anoxic/oxic (A2/O) process was developed for municipal wastewater treatment in this study. The effects of dissolved oxygen (DO) concentration, hydraulic retention time (HRT) and the ratio of chemical oxygen demand (COD) to total nitrogen (C/N) in the influent were investigated for optimization, in order to achieve the removal of total nitrogen (TN), total phosphorus (TP) and COD in the reactor simultaneously. When the DO concentration of 2.0 mg/L in the aerobic zone, HRT of 12 h and C/N ratio of 8:1 were applied in the reactor, the superior removal efficiencies of COD, TN and TP reached 96%, 81% and 92%, respectively. The modification in integrated OCO system was characterized by the mixing of the liquid refluxed from anoxic and aerobic zones with the influent in the anaerobic zone. And the risk of activated sludge bulking was decreased successfully by enhancing phosphorus removal without any chemical auxiliary methods. Quite precise prediction results with the correlation coefficients (R) of 0.9584-0.9948 were forecasted by the back-propagation neural network model. All the results indicated that the integrated OCO process is able to remove TN, TP and COD in a reactor simultaneously.

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“…Quan et al, 2011;Yan et al, 2009;Takei et al, 2011;Sun et al, 2011;kimura et al, 2013 Takei et al, 2011;Quan et al, 2010;Magrí et al, 2012). Quan et al, (2010) …”

Section: 서 론unclassified

Comparison of nitrogen removal efficiency on process stability for granular and immobilized anammox bacteria

)¹,

배효관

정진영³

et al. 2014

Journal of Korean Society of Water and Wastewater

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: Immobilization of anaerobic ammonium oxidizing bacteria has been studied to enhance the biomass retention of the slowly growing bacteria and the process stability. The purpose of this study was to compare the nitrogen removal efficiency of granular and immobilized anammox bacteria with poly vinyl alcohol and alginate. The specific anammox activity of the granular, homoginized and immobilized anammox bacteria were 0.016±0.0002 gN/gVSS/d, 0.011±0.001 gN/gVSS/d and 0.007±0.0005 gN/gVSS/d, respectively. Although the activity decreased to 43.7 % of the original one due to low pH and O 2 exposure during the homogination and the immobilization, it was rapidly recovered within 7 days in the following continuous culture.When synthetic T-N concentrations of 100, 200, 400, 800 mg/L were fed, the immobilized anammox bacteria showed higher nitrogen removal efficiencies at all operational conditions than those of granular anammox bacteria. When the sludge retention time was shorten below 30.7 days and the reject water was fed, the nitrite removal efficiency of the granular anammox bacteria dropped to 8 % of the initial value, while that of the immobilized anammox bacteria was maintained over 95 % of the initial one.The immobilization with poly vinyl alcohol and alginate would be a feasible method to improve the performance and stability of the anammox process.

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Partial nitrification to nitrite for treating ammonium-rich organic wastewater by immobilized biomass system

Cited by 62 publications

References 23 publications

Immobilization of Anammox biomass in sodium alginate

Immobilization of Anammox biomass in sodium alginate

Simultaneous removal of nitrogen, phosphorus and COD in an integrated OCO reactor

Comparison of nitrogen removal efficiency on process stability for granular and immobilized anammox bacteria

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