Step-wise temperature decreasing cultivates a biofilm with high nitrogen removal rates at 9°C in short-term anammox biofilm tests

2016 ◽  
Vol 37 (15) ◽  
pp. 1933-1946 ◽  
Author(s):  
Ivar Zekker ◽  
Ergo Rikmann ◽  
Anni Mandel ◽  
Kristel Kroon ◽  
Andrus Seiman ◽  
...  
Keyword(s):  
Nitrogen Removal ◽  
High Nitrogen ◽  
Short Term ◽  
Removal Rates

scholarly journals How Waterlogged Conditions Influence the Nitrogen Removal Performance in a Micro Constructed Wetland

2021 ◽  
Author(s):  
Lumeng Xie ◽  
Ying Liu ◽  
Shiqiang Zhao ◽  
Liyi Dai ◽  
Mingxiang Zhang ◽  
...  
Keyword(s):  
Root System ◽  
Removal Efficiency ◽  
Nitrogen Removal ◽  
Constructed Wetland ◽  
Plant Biomass ◽  
Lythrum Salicaria ◽  
Short Term ◽  
Removal Rates ◽  
Wetland Ecosystems ◽  
The Relationship

Abstract Growing populations and industrialization have led to raised wetland ecosystems nitrogen(N) loads. A micro constructed wetland planted with Lythrum salicaria L treating an artificial wastewater was used to investigate the short-term variations in the plant biomass and the removal efficiency of N. Our results showed that the biomass of Lythrum salicaria L. increased rapidly during the experiment due to their extensive root system and vigorous spread, and waterlogged conditions had little effect on the relationship between biomass and the concentration of TN in soil and effluent. Under different waterlogged conditions, the removal rates of TN in the water were all more than 60%, providing a reference for waterlogged conditions used in wetland eutrophication restoration.

scholarly journals Evaluation of a novel low-carbon to nitrogen- and temperature-tolerant simultaneously nitrifying–denitrifying bacterium and its use in the treatment of river water

RSC Advances ◽  
2018 ◽  
Vol 8 (48) ◽  
pp. 27417-27422 ◽  
Author(s):  
Peng Jin ◽  
Yinyan Chen ◽  
Zhanwang Zheng ◽  
Qizhen Du
Keyword(s):  
Low Temperature ◽  
River Water ◽  
Removal Efficiency ◽  
Nitrogen Removal ◽  
Simultaneous Nitrification And Denitrification ◽  
Low Carbon ◽  
High Nitrogen ◽  
Denitrifying Bacterium ◽  
Nitrification And Denitrification

A novel simultaneous nitrification and denitrification Klebsiella sp. exhibits high nitrogen removal efficiency under low-temperature and low C/N wastewater.

scholarly journals Performance of the anammox sequencing batch reactor treating synthetic and real landfill leachate

2018 ◽  
Vol 44 ◽  
pp. 00179 ◽  
Author(s):  
Mariusz Tomaszewski ◽  
Grzegorz Cema ◽  
Tomasz Twardowski ◽  
Aleksandra Ziembińska-Buczyńska
Keyword(s):  
Nitrogen Removal ◽  
Landfill Leachate ◽  
Sequencing Batch Reactor ◽  
Batch Reactor ◽  
Nitrogen Loading ◽  
Synthetic Wastewater ◽  
High Nitrogen ◽  
Removal Capacity ◽  
Anammox Activity ◽  
Anammox Process

The anaerobic ammonium oxidation (anammox) process is one of the most energy efficient and environmentally-friendly bioprocess for the treatment of the wastewater with high nitrogen concentration. The aim of this work was to study the influence of the high nitrogen loading rate (NLR) on the nitrogen removal in the laboratory-scale anammox sequencing batch reactor (SBR), during the shift from the synthetic wastewater to landfill leachate. In both cases with the increase of NLR from 0.5 to 1.1 – 1.2 kg N/m3d, the nitrogen removal rate (NRR) increases to about 1 kg N/m3d, but higher NLR caused substrates accumulation and affects anammox process efficiency. Maximum specific anammox activity was determined as 0.638 g N/g VSSd (NRR 1.023 kg N/m3d) and 0.594 g N/g VSSd (NRR 1.241 kg N/m3d) during synthetic and real wastewater treatment, respectively. Both values are similar and this is probably the nitrogen removal capacity of the used anammox biomass. This indicates, that landfill leachate did not influence the nitrogen removal capacity of the anammox process.

Improving nitrogen removal in predenitrification-nitrification biofilters

2004 ◽  
Vol 48 (11-12) ◽  
pp. 419-428 ◽  
Author(s):  
L. Larrea ◽  
A. Abad ◽  
J. Gayarre
Keyword(s):  
Dissolved Oxygen ◽  
Activated Sludge ◽  
Nitrogen Removal ◽  
Suspended Solids ◽  
Complete Removal ◽  
Cod Removal ◽  
Nitrification Rate ◽  
Removal Rates ◽  
N Removal ◽  
Activated Sludge Processes

The effect on NH4-N removal rates in nitrification biofilters of filtered biodegradable COD and particulate COD leaving predenitrification biofilters was studied in a lab scale plant configured with the separated system of biofilters for secondary nitrogen removal from urban wastewaters. Applying a typical COD load of 11 kg/m3.day to the predenitrification biofilter and maximizing its COD removal by adding nitrates or by operating an improved control of the internal recycle, only 60% removal of filtered biodegradable COD was found. This value corresponds to the complete removal of the readily biodegradable substrate (30% of influent filtered COD) and 36% of filtered slowly biodegradable substrate (50% of influent COD). The remaining 64% of the latter entered the nitrification biofilter, causing competition between heterotrophs and nitrifiers for dissolved oxygen in the inner layers of the biofilm. Consequently the nitrification rate had relatively low values (0.5 kgN/m3.d) at 14°C despite using dissolved oxygen levels of 6 mg/l. This behaviour may explain the lower nitrification rates obtained in some cases of nitrification biofilters compared to those in tertiary nitrification after activated sludge processes. The particulate COD entering the nitrification biofilter is associated with the suspended solids leaving the denitrification biofilter which are adsorbed by the external layers of the biofilm, increasing its thickness. The activity of the nitrifiers was affected because of a lack of oxygen when the thickness was left to grow considerably. Therefore no significant particulate COD effect is expected to occur as long as backwashing is carried out with the appropriate frequency.

High nitrogen removal rate using ANAMMOX process at short hydraulic retention time

2013 ◽  
Vol 67 (5) ◽  
pp. 968-975 ◽  
Author(s):  
C. G. Casagrande ◽  
A. Kunz ◽  
M. C. De Prá ◽  
C. R. Bressan ◽  
H. M. Soares
Keyword(s):  
Nitrogen Removal ◽  
Removal Rate ◽  
Uasb Reactor ◽  
Anaerobic Sludge ◽  
Ammonium Oxidation ◽  
High Nitrogen ◽  
Total N ◽  
Column Reactor ◽  
Anaerobic Sludge Blanket ◽  
Anammox Process

The anaerobic ammonium oxidation (ANAMMOX) is a chemolithoautotrophic process, which converts NH4+ to N2 using nitrite (NO2−) as the electron acceptor. This process has very high nitrogen removal rates (NRRs) and is an alternative to classical nitrification/denitrification wastewater treatment. In the present work, a strategy for nitrogen removal using ANAMMOX process was tested evaluating their performance when submitted to high loading rates and very short hydraulic retention times (HRTs). An up-flow ANAMMOX column reactor was inoculated with 30% biomass (v v−1) fed from 100 to 200 mg L−1 of total N (NO2−-N + NH4+-N) at 35 °C. After start-up and process stability the maximum NRR in the up-flow anaerobic sludge blanket (UASB) reactor was 18.3 g-N L−1 d−1 operated at 0.2 h of HRT. FISH (fluorescence in situ hybridization) analysis and process stoichiometry confirmed that ANAMMOX was the prevalent process for nitrogen removal during the experiments. The results point out that high NRRs can be obtained at very short HRTs using up-flow ANAMMOX column reactor configuration.

Nitrogen removal from water containing high nitrate nitrogen in a paddy field (wetland)

2003 ◽  
Vol 48 (10) ◽  
pp. 209-216 ◽  
Author(s):  
H. Nakasone ◽  
H. Kuroda ◽  
T. Kato ◽  
T. Tabuchi
Keyword(s):  
Ground Water ◽  
River Water ◽  
Green Tea ◽  
Nitrogen Removal ◽  
Nitrate Nitrogen ◽  
Nitrogen Concentration ◽  
Spring Water ◽  
Paddy Fields ◽  
High Nitrogen ◽  
High Nitrogen Concentration

Nowadays, it has become very common to find in Japan that nitrate nitrogen concentrations are very high in spring water and in well water where the land use of a watershed is agricultural. We have often observed around 50 mg/L of nitrate nitrogen in the spring water where we live. Crops produced in those fields are mainly vegetables such as celery, cabbage, lettuce, carrots, and so on. Green tea is also popular in Japan. In order to produce good quality green tea, farmers apply a great amount of nitrogen fertilizer. This amount can reach up to 1,000 kg/ha in some areas, although the average application amounts to 628 kg/ha in Japan. As a result, ground water that is rich in nitrate flows into the river, which results in a high nitrogen concentration in river water and ground water. Further, this causes a low pH in river water in some tributary rivers in Japan, though this kind of case is very rare. We knew from field tests that if water contained a high nitrogen concentration and was introduced into paddy fields, high nitrogen removal would be performed. This paper presents the outline and results of a system on how to remove nitrogen using paddy fields (wetlands). Further, this paper presents the evaluated results of the removal quantity at the watershed level.

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