Quick Cultivation of Micro-Aerobic Granular Sludge for Simultaneous Nitrogen Removal

2011 ◽  
Vol 415-417 ◽  
pp. 1239-1242
Author(s):  
Xiao Liu ◽  
Li Na Guo
Keyword(s):  
Nitrogen Removal ◽  
Settling Velocity ◽  
Average Particle Size ◽  
Sewage Treatment ◽  
Granular Sludge ◽  
Aerobic Granular Sludge ◽  
Average Particle ◽  
Excess Sludge ◽  
Effluent Recirculation ◽  
Oxygenation Rate

In order to accelerate the cultivation of micro-aerobic granular sludge for domestic sewage treatment, an expanded granular sludge bed (EGSB) reactor seeded with excess sludge was employed. It was found that micro-aerobic granules can form and grew compact within one month, and remained stable during the later operation, the mature cultivation had average particle size of 0.81mm, and 64% of the granules had settling velocity above 35m•h-1. Moreover, excellent COD and nitrogen removal were obtained. For hydraulic retention time (HRT) of 5h, as the recirculation ratio and oxygenation rate were set at 6.5 and 0.25g•L-1d-1respectively, COD removal ranged in 80%-91%, leaving effluent COD below 50mg•L-1. The removal efficiency of ammonium and total nitrogen (TN) were 72%-89% and 76%-87%, respectively with effluent concentration down to 3-12mg•L-1and 5-14mg•L-1. Results showed that the efficiency of simultaneous nitrogen removal was much influenced by effluent recirculation and oxygenation rate in micro-aerobic EGSB reactor.

scholarly journals Energy efficient treatment of A-stage effluent: pilot-scale experiences with shortcut nitrogen removal

2016 ◽  
Vol 73 (9) ◽  
pp. 2150-2158 ◽  
Author(s):  
D. Seuntjens ◽  
B. L. M. Bundervoet ◽  
H. Mollen ◽  
C. De Mulder ◽  
E. Wypkema ◽  
...  
Keyword(s):  
Average Particle Size ◽  
Sewage Treatment ◽  
Treatment Plant ◽  
Oxygen Demand ◽  
Granular Sludge ◽  
Pilot Scale ◽  
High Rate ◽  
Average Particle ◽  
Efficient Treatment ◽  
N Removal

Energy autarky of sewage treatment plants, while reaching chemical oxygen demand (COD) and N discharge limits, can be achieved by means of shortcut N-removal. This study presents the results of a shortcut N-removal pilot, located at the biological two-‘stage (high/low rate) wastewater treatment plant of Breda, The Netherlands. The pilot treated real effluent of a high-rate activated sludge (COD/N = 3), fed in a continuous mode at realistic loading rates (90–100 g N/(m3·d)). The operational strategy, which included increased stress on the sludge settling velocity, showed development of a semi-granular sludge, with average particle size of 280 μm (ø4,3), resulting in increased suppression of nitrite-oxidizing bacteria. The process was able to remove part of the nitrogen (51 ± 23%) over nitrite, with COD/N removal ratios of 3.2 ± 0.9. The latter are lower than the current operation of the full-scale B-stage in Breda (6.8–9.4), showing promising results for carbon-efficient N-removal, while producing a well settling sludge (SVI30 < 100 mL/g).

Formation and Characteristics of Aerobic Granular Sludge for Simultaneous Phosphorus and Nitrogen Removal in a SBR

2011 ◽  
Vol 356-360 ◽  
pp. 1630-1636
Author(s):  
Guo Jing Yang ◽  
Xiao Ming Li ◽  
Qi Yang ◽  
Kun Luo
Keyword(s):  
Nitrogen Removal ◽  
Sequencing Batch Reactor ◽  
Settling Velocity ◽  
Selective Pressure ◽  
Batch Reactor ◽  
Treatment Plant ◽  
Granular Sludge ◽  
Aerobic Granular Sludge ◽  
Conventional Activated Sludge ◽  
Sedimentation Time

With inoculum sludge from a conventional activated sludge wastewater treatment plant, formation of aerobic granular sludge for simultaneous phosphorus and nitrogen removal was realized in a sequencing batch reactor by the selective pressure as a driving force. Selective pressure created by means of decreasing sedimentation time and increasing substrate loading enhanced the formation of aerobic granular sludge, which followed four consecutive stages: acclimation, granulation, growth and maturation. Under the condition that the substrate loading were increased to 500mg COD/(L•d) and 48mg NH4 +-N/(L•d), the granules were the dominant sludge forms with most of diameter about 0.5–2.0 mm, a minimal settling velocity of 0.55 cm/s and a MLSS of 6800 mg/L after 120 days operation. The granules were composed of filamentous species with varying degrees of rod- and coccal-type bacteria. Microscopic examination revealed that granules microecosystem was more stable and should be less vulnerable to the changes of mixed liquor condition.

Nitrifier Augmentation for High Ammonia Nitrogen Removal by Aerobic Granular Sludge at Low Temperatures

2016 ◽  
Vol 44 (5) ◽  
pp. 525-531 ◽  
Author(s):  
Shuo Wang ◽  
Qianqian Yang ◽  
Wenxin Shi ◽  
Shuili Yu ◽  
Yan Wang ◽  
...  
Keyword(s):  
Nitrogen Removal ◽  
Low Temperatures ◽  
Granular Sludge ◽  
Ammonia Nitrogen ◽  
Aerobic Granular Sludge ◽  
High Ammonia

Strategies to improve aerobic granular sludge stability and nitrogen removal based on feeding mode and substrate

2019 ◽  
Vol 84 ◽  
pp. 144-154 ◽  
Author(s):  
Quan Yuan ◽  
Hui Gong ◽  
Hao Xi ◽  
Heng Xu ◽  
Zhengyu Jin ◽  
...  
Keyword(s):  
Nitrogen Removal ◽  
Granular Sludge ◽  
Aerobic Granular Sludge ◽  
Feeding Mode

Effect of chromium (VI) on the multiple nitrogen removal pathways and microbial community of aerobic granular sludge

2017 ◽  
Vol 39 (13) ◽  
pp. 1682-1696 ◽  
Author(s):  
Xiao-ying Zheng ◽  
Dan Lu ◽  
Ming-yang Wang ◽  
Wei Chen ◽  
Gan Zhou ◽  
...  
Keyword(s):  
Microbial Community ◽  
Nitrogen Removal ◽  
Granular Sludge ◽  
Aerobic Granular Sludge ◽  
Chromium Vi

scholarly journals The treatment of solvent recovery raffinate by aerobic granular sludge in a pilot-scale sequencing batch reactor

2015 ◽  
Vol 13 (3) ◽  
pp. 746-757 ◽  
Author(s):  
Bei Long ◽  
Chang-zhu Yang ◽  
Wen-hong Pu ◽  
Jia-kuan Yang ◽  
Guo-sheng Jiang ◽  
...  
Keyword(s):  
Suspended Solids ◽  
Sequencing Batch Reactor ◽  
Batch Reactor ◽  
Granular Sludge ◽  
Pilot Scale ◽  
Volume Index ◽  
Aerobic Granular Sludge ◽  
Average Particle ◽  
Solvent Recovery ◽  
Mixed Liquor

Mature aerobic granular sludge (AGS) was inoculated for the start-up of a pilot-scale sequencing batch reactor for the treatment of high concentration solvent recovery raffinate (SRR). The proportion of simulated wastewater (SW) (w/w) in the influent gradually decreased to zero during the operation, while volume of SRR gradually increased from zero to 10.84 L. AGS was successfully domesticated after 48 days, which maintained its structure during the operation. The domesticated AGS was orange, irregular, smooth and compact. Sludge volume index (SVI), SV30/SV5, mixed liquor volatile suspended solids/mixed liquor suspended solids (MLVSS/MLSS), extracellular polymeric substances, proteins/polysaccharides, average particle size, granulation rate, specific oxygen utilization rates (SOUR)H and (SOUR)N of AGS were about 38 mL/g, 0.97, 0.52, 39.73 mg/g MLVSS, 1.17, 1.51 mm, 96.66%, 47.40 mg O2/h g volatile suspended solids (VSS) and 8.96 mg O2/h g VSS, respectively. Good removal effect was achieved by the reactor. Finally, the removal rates of chemical oxygen demand (COD), total inorganic nitrogen (TIN), NH4+-N and total phosphorus (TP) were more than 98%, 96%, 97% and 97%, respectively. The result indicated gradually increasing the proportion of real wastewater in influent was a useful domestication method, and the feasibility of AGS for treatment of high C/N ratio industrial wastewater.

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