Comprehensive assessment of free nitrous acid-based technology to establish partial nitrification

2018 ◽  
Vol 4 (12) ◽  
pp. 2113-2124
Author(s):  
Cancan Jiang ◽  
Shengjun Xu ◽  
Rui Wang ◽  
Sining Zhou ◽  
Shanghua Wu ◽  
...  
Keyword(s):  
Activated Sludge ◽  
Nitrous Acid ◽  
Comprehensive Assessment ◽  
Partial Nitrification ◽  
Free Nitrous Acid ◽  
Promising Technology ◽  
Nitrite Oxidizing Bacteria

Treating activated sludge with free nitrous acid (FNA) to selectively eliminate nitrite-oxidizing bacteria (NOB) and retain ammonium-oxidizing bacteria (AOB) is increasingly regarded as a promising technology for achieving partial nitrification.

scholarly journals Effect of Free Ammonia, Free Nitrous Acid, and Alkalinity on the Partial Nitrification of Pretreated Pig Slurry, Using an Alternating Oxic/Anoxic SBR

2017 ◽  
Vol 2017 ◽  
pp. 1-7 ◽  
Author(s):  
Marisol Belmonte ◽  
Chia-Fang Hsieh ◽  
José Luis Campos ◽  
Lorna Guerrero ◽  
Ramón Méndez ◽  
...  
Keyword(s):  
Nitrous Acid ◽  
Batch Reactor ◽  
Inhibitory Effect ◽  
Free Ammonia ◽  
Partial Nitrification ◽  
Total Alkalinity ◽  
Pig Slurry ◽  
Solid Retention Time ◽  
Free Nitrous Acid ◽  
Nitrite Oxidizing Bacteria

The effect of free ammonia (NH3or FA), free nitrous acid (HNO2or FNA), and total alkalinity (TA) on the performance of a partial nitrification (PN) sequencing batch reactor (SBR) treating anaerobically pretreated pig slurry was studied. The SBR was operated under alternating oxic/anoxic (O/A) conditions and was fed during anoxic phases. This strategy allowed using organic matter to partially remove nitrite (NO2-) and nitrate (NO3-) generated during oxic phases. The desiredNH4+toNO2-ratio of 1.3 g N/g N was obtained when an Ammonium Loading Rate (ALR) of 0.09 gNH4+-N/L·d was applied. The system was operated at a solid retention time (SRT) of 15–20 d and dissolved oxygen (DO) levels higher than 3 mg O2/L during the whole operational period. PN mainly occurred caused by the inhibitory effect of FNA on nitrite oxidizing bacteria (NOB). Once HNO2concentration was negligible,NH4+was fully oxidized toNO3-in spite of the presence of FA. The use of biomass acclimated to ammonium as inoculum avoided a possible effect of FA on NOB activity.

scholarly journals Performance and mechanism of free nitrous acid on the solubilization of waste activated sludge

RSC Advances ◽  
2018 ◽  
Vol 8 (29) ◽  
pp. 15897-15905 ◽  
Author(s):  
Jinsong Wang ◽  
Zhaoji Zhang ◽  
Xin Ye ◽  
Fuyi Huang ◽  
Shaohua Chen
Keyword(s):  
Activated Sludge ◽  
Nitrous Acid ◽  
Large Concentration ◽  
Waste Activated Sludge ◽  
Free Nitrous Acid ◽  
Performance And Mechanism

The mechanism of sludge solubilization induced by free nitrous acid over a large concentration range was investigated using SIET and FCM.

Free Nitrous Acid (FNA)-Based Pretreatment Enhances Methane Production from Waste Activated Sludge

2013 ◽  
Vol 47 (20) ◽  
pp. 11897-11904 ◽  
Author(s):  
Qilin Wang ◽  
Liu Ye ◽  
Guangming Jiang ◽  
Paul D. Jensen ◽  
Damien J. Batstone ◽  
...  
Keyword(s):  
Activated Sludge ◽  
Methane Production ◽  
Nitrous Acid ◽  
Waste Activated Sludge ◽  
Free Nitrous Acid

Optimization of free nitrous acid pre-treatment on waste activated sludge

2018 ◽  
Vol 252 ◽  
pp. 216-220 ◽  
Author(s):  
S. Zahedi ◽  
M. Romero-Güiza ◽  
Pilar Icaran ◽  
Z. Yuan ◽  
M. Pijuan
Keyword(s):  
Activated Sludge ◽  
Nitrous Acid ◽  
Waste Activated Sludge ◽  
Free Nitrous Acid ◽  
Pre Treatment

Model-based study of nitrite accumulation with OUR control in two continuous nitrifying activated sludge configurations

2009 ◽  
Vol 60 (10) ◽  
pp. 2685-2693 ◽  
Author(s):  
Irene Jubany ◽  
Juan Antonio Baeza ◽  
Javier Lafuente ◽  
Julian Carrera
Keyword(s):  
Partial Nitrification ◽  
Nitrite Accumulation ◽  
Good Tool ◽  
Free Nitrous Acid ◽  
Stirred Tank Reactors ◽  
Inhibitory Compounds ◽  
Nitrite Oxidizing Bacteria ◽  
In Series ◽  
Continuous Stirred Tank ◽  
Different Characteristics

Achievement of partial nitrification relies on the different characteristics of the microorganisms involved in the two steps of nitrification (AOB, ammonium oxidizing bacteria and NOB, nitrite oxidizing bacteria). Several configurations and conditions have been used to achieve partial nitrification taking into account their different responses in front of some environmental conditions like pH, temperature (T), dissolved oxygen (DO) and the inhibitory compounds free ammonia (FA) and free nitrous acid (FNA). This work is a theoretical study about the utilization of a control strategy based on controlling OUR by manipulating the influent flow-rate together with additional changes in T, pH or DO for achieving stable partial nitrification. Two different configurations were simulated. Configuration A consisted of three continuous stirred-tank reactors in series plus a settler, while configuration B consisted of a single reactor with the same total volume and a settler. The developed control system was shown as a good tool to achieve partial nitrification with both configurations. Nevertheless, configuration A showed better results and partial nitrification was obtained even under theoretically unfavourable conditions as T = 15°C, pH = 8.3 and DO = 3 mg O2 L−1.

Sign in / Sign up

Export Citation Format

Share Document