scholarly journals APPLICATION OF ANOXIC BATCH PROCESS TO TREAT HIGH NITROGEN CONCENTRATION OF LEAKAGE FROM OLD LANDFILLS

2009 ◽  
Vol 12 (2) ◽  
pp. 64-73
Author(s):  
Huy Quang Le ◽  
Dan Phuoc Nguyen ◽  
Phong Thanh Nguyen
Keyword(s):  
Biological Treatment ◽  
Batch Reactor ◽  
Nitrogen Concentration ◽  
Batch Process ◽  
Ammonia Removal ◽  
Nitrogen Loading ◽  
Total N ◽  
Nitrite Removal ◽  
Biological Methods ◽  
High Nitrogen Concentration

This study aims to treat TNO, (nitrogen oxides include nitrite and nitrate) in leakage of old landfills by anoxic biological methods with TNO, concentration is about 1,000 mg/L. Anoxic sequencing batch reactor is applied in this study. Denitrification using anoxic reactor hasn't had obvious indication of anammox mechanism, however, nitrogen removal through denitrification is high if it is supplied with sufficient carbon. The optimal ratio between added COD and N-nitrite is 1.5:1 and the ratio between reducing COD and reducing nitrite is 2.2:1 in which 30% of reducing COD is available COD nitrite removal may achieve 95% if nitrogen loading is 0.115 (kg reducing N-NO/moday) or 0.115 (g reducing N-NO/g MLSS. day). Therefore, total N-ammonia removal of biological treatment is about 80-85%.

Development and optimisation of VFA driven DEAMOX process for treatment of strong nitrogenous anaerobic effluents

2008 ◽  
Vol 57 (3) ◽  
pp. 323-328 ◽  
Author(s):  
S. V. Kalyuzhnyi ◽  
M. A. Gladchenko ◽  
Ho Kang ◽  
A. Mulder ◽  
A. Versprille
Keyword(s):  
Total Nitrogen ◽  
Electron Donor ◽  
Volatile Fatty Acids ◽  
Stable Process ◽  
Ammonia Removal ◽  
Nitrogen Loading ◽  
Ammonium Oxidation ◽  
Total N ◽  
Reject Water ◽  
Total Nitrogen Removal

The recently proposed DEAMOX (DEnitrifying AMmonium OXidation) process combines the anammox reaction with autotrophic denitrifying conditions using sulphide as an electron donor for the production of nitrite from nitrate within an anaerobic biofilm. This paper firstly presents a feasibility study of the DEAMOX process using synthetic (ammonia + nitrate) wastewater where sulphide is replaced by volatile fatty acids (VFA) as a more widespread electron donor for partial denitrification. Under the influent N-NH4+/N-NO3− and COD/N-NO3− ratios of 1 and 2.3, respectively, the typical efficiencies of ammonia removal were around 40% (no matter whether a VFA mixture or only acetate were used) for nitrogen loading rates (NLR) up to 1236 mg N/l/d. This parameter increased to 80% by increasing the influent COD/N-NO3− ratio to 3.48 and decreasing the influent N-NH4+/N-NO3− ratio to 0.29. As a result, the total nitrogen removal increased to 95%. The proposed process was further tested with typical strong nitrogenous effluent such as reject water (total N, 530–566 mg N/l; total COD, 1530–1780 mg/l) after thermophilic sludge anaerobic digestion. For this, the raw wastewater was split and partially (∼50%) fed to a nitrifying reactor (to generate nitrate) and the remaining part (∼50%) was directed to the DEAMOX reactor where this stream was mixed with the nitrified effluent. Stable process performance up to NLR of 1,243 mg N/l/d in the DEAMOX reactor was achieved resulting in 40, 100, and 66% removal of ammonia, NOx−, and total nitrogen, respectively.

Fast Pyrolysis of Soy Hulls in a Fluidized Bed Reactor: Main Components of the Bio-Oil

2014 ◽  
Vol 802 ◽  
pp. 239-244
Author(s):  
Tiago José Pires de Oliveira ◽  
Cássia Regina Cardoso ◽  
Carlos Henrique Ataíde
Keyword(s):  
Fluidized Bed ◽  
Batch Reactor ◽  
Nitrogen Concentration ◽  
Fast Pyrolysis ◽  
Vapor Condensation ◽  
Internal Diameter ◽  
Bio Oil ◽  
Soy Hulls ◽  
Main Components ◽  
High Nitrogen Concentration

The fast pyrolysis is an efficient and promising process of thermal decomposition. The process consists in the reaction of organic materials in the total or partial absence of oxygen to produce condensable vapor, non-condensable gases and char. Bio-oil is generated after vapor condensation and it can be converted into fuels and/or chemicals. Fast pyrolysis of soy hulls was conducted in a batch reactor fluidized bed, made of stainless steel, with internal diameter of 78 mm and 1069 mm height. The fast pyrolysis of soy hulls, mixed with inert (sand), was carried out at approximately 550 °C. Atmosphere with high nitrogen concentration was used. The present study aimed to investigate the chemical composition of the soy hulls bio-oil using gas chromatography and mass spectrometry techniques.

scholarly journals Nitrogen Removal for Liquid-Ammonia Mercerization Wastewater via Partial Nitritation/Anammox Based on Zeolite Sequencing Batch Reactor

Water ◽  
2020 ◽  
Vol 12 (8) ◽  
pp. 2234
Author(s):  
Lei Zheng ◽  
Yongxing Chen ◽  
Songwei Zhou ◽  
Yuchen Chen ◽  
Xingxing Wang ◽  
...  
Keyword(s):  
Nitrogen Removal ◽  
Textile Industry ◽  
Liquid Ammonia ◽  
Sequencing Batch Reactor ◽  
Batch Reactor ◽  
Ammonia Removal ◽  
Nitrogen Loading ◽  
Nitrite Accumulation ◽  
Sequencing Analysis ◽  
Partial Nitritation

Liquid-ammonia mercerization is commonly used to enhance the quality of cotton fabric in the textile industry, resulting in a large amount of liquid-ammonia mercerization wastewater (LMWW) containing high concentration of ammonia to be disposed of. This study proposes a partial nitritation/anammox (PN/A) process based on stable nitritation by a zeolite sequencing batch reactor (ZSBR) for the nitrogen removal of LMWW. The ZSBR could quickly achieve stably full nitritation with a nitrite accumulation ratio higher than 97% and an ammonia removal rate of 0.86 kg N·m−3·d−1 for the raw LMWW with an ammonia level of 1490 mg/L. In order to avoid anammox inhibition by free nitrous acid, the ZSBR was successfully changed to PN operation with diluted LMWW for effluent meeting anammox requirements. The next anammox reactor (an up-flow blanket filter (UBF)) realized a total nitrogen removal efficiency of 70.0% with a NLR (nitrogen loading rate) of 0.82 kg N·m−3·d−1 for LMWW. High-throughput sequencing analysis results indicated that Nitrosomonas and Candidatus Kuenenia were the dominant bacteria in ZSBR and UBF, respectively. All results revealed that the PN/A process based on ZSBR as the PN pretreatment process was feasible for LMWW, facilitating cost-effective and low-carbon nitrogen removal for LMWW treatment in the textile industry in the future.

Formation and characteristics of nitritation granules cultivated in sequencing batch reactor by stepwise increase of N/C ratio

2011 ◽  
Vol 64 (7) ◽  
pp. 1479-1487 ◽  
Author(s):  
Ling-yun Li ◽  
Yong-zhen Peng ◽  
Shu-ying Wang ◽  
Lei Wu ◽  
Yong Ma ◽  
...  
Keyword(s):  
Sequencing Batch Reactor ◽  
Batch Reactor ◽  
Ammonia Removal ◽  
Nitrogen Loading ◽  
Volume Index ◽  
Synthetic Wastewater ◽  
Nitrifying Bacteria ◽  
Stepwise Increase ◽  
Start Up ◽  
Total Bacteria

The cultivation of nitritation granules in sequencing batch reactor (SBR) by seeding conventional floccular activated sludge was investigated using ethanol-based synthetic wastewater. Reducing settling time offers selection pressure for aerobic granulation, and stepwise increase of influent N/C ratio can help to selectively enrich ammonia oxidizing bacteria (AOB) in aerobic granules. The spherical shaped granules were observed with the mean diameter of 1.25 mm, average settling velocity of 1.9 cm s−1 and the sludge volume index (SVI) of 18.5–31.4 ml g−1. After 25 days of operation, the nitrogen loading rate reached 0.0455 kg NH4+-N (kg MLSS·d)−1, which was 4.55 times higher than that of the start-up period. The mature granules showed high nitrification ability. Ammonia removal efficiency was above 95% and nitrite accumulation ratio was in the range of 80–95%. The nitrifying bacteria were quantified by fluorescence in situ hybridization analysis, which indicated that AOB was 14.9 ± 0.5% of the total bacteria and nitrite oxidizing bacteria (NOB) was 0.89 ± 0.1% of the total bacteria. Therefore, AOB was the dominant nitrifying bacteria. It was concluded that the associated inhibition of free ammonia at the start of each cycle and free nitrous acid during the later phase of aeration may be the key factors to start up and maintain the stable nitritation.

scholarly journals PENGARUH PENAMBAHAN IMPELLER TERHADAP KINERJA SEQUENCING BATCH REACTOR PADA LIMBAH CAIR TAHU

2021 ◽  
Vol 7 (1) ◽  
Author(s):  
Irma Ilham Yadaturrahmah ◽  
Novirina Hendrasarie
Keyword(s):  
Wastewater Treatment ◽  
Retention Time ◽  
Industrial Wastewater ◽  
Biological Treatment ◽  
Sequencing Batch Reactor ◽  
Hydraulic Retention Time ◽  
Batch Reactor ◽  
Organic Content ◽  
Total N ◽  
N Removal

Saat ini usaha industri tahu sedang berkembang. Limbah yang dihasilkan dari industri tahu akan menjadi suatu permasalahan bagi lingkungan. Pengolahan air limbah industri tahu dapat dilakukan dengan cara pengolahan biologis karena dapat menurunkan kandungan organik pada air limbah tahu.  Salah satu teknologi pengolahan limbah yang efektif dan efisien adalah Sequencing Batch Reactor (SBR).  Prinsip operasi SBR adalah mengisi dan menarik (fill and draw), yang terdiri dari lima tahap yaitu pengisian (fill), reaksi (reaction), pengendapan (settle), pembuangan air olahan (decand) dan pembuangan lumpur (idle).  Penelitian ini bertujuan untuk mengetahui kinerja SBR dengan penambahan impeller pada fase aerobik dalam menurunkan kandungan BOD, PO4 dan N Total pada air limbah tahu. SBR dioperasikan dengan waktu retensi hidrolik (HRT) dan kecepatan pengadukan yang bervariasi, yaitu masing-masing sebesar 24, 36 jam dan 48 jam serta kecepatan pengadukan sebesar 50, 100 dan 150 rpm. Dari hasil penelitian didapatkan HRT dan kecepatan pengadukan optimum, yaitu masing-masing sebesar 48 jam dan 150 rpm. Dengan efisiensi penyisihan BOD, PO4 dan N Total yang dihasilkan, masing-masing sebesar 93,33%, 90,97% dan 93,73%. Kata kunci: air limbah tahu, impeller, kecepatan, pengadukan, Sequencing Batch Reactor (SBR), waktu retensi hidrolik (HRT).  Currently the tofu industry is growing. The waste produced from the tofu industry will be a problem for the environment. Tofu industrial wastewater treatment can be done by biological treatment because it can reduce the organic content in tofu wastewater. One of the effective and efficient waste treatments is Sequencing Batch Reactor (SBR). The principle of operation of the SBR is fill and draw, which consists of five stages, fill,, reaction, settle, decand and idle. This study aims to see the performance of SBR with the addition of an impeller in the aerobic phase in reducing the content of BOD, PO4 and Total N in tofu wastewater. SBR is operated with a hydraulic retention time (HRT) and varying stirring speeds, namely 24, 36 and 48 hours respectively and stirring speeds of 50, 100 and 150 rpm. The results showed that the optimal HRT and stirring speed were 48 hours and 150 rpm, respectively. With the efficiency of BOD, PO4 and Total N removal produced, respectively 93,33%, 90,97% and 93,73%. Keywords: Hydraulic Retention Time (HRT), impeller, Sequencing Batch Reactor (SBR), speed, stirring, Tofu Industrial Wastewater. 

Effects of HRT on biological nitrogen removal in single-stage autotrophic process

2016 ◽  
Vol 1 (2) ◽  
pp. 18 ◽  
Author(s):  
Hong Liang ◽  
Shutong Liu ◽  
Xue Li ◽  
Xueying Sun ◽  
Dawen Gao
Keyword(s):  
Removal Efficiency ◽  
Nitrogen Removal ◽  
Removal Rate ◽  
Batch Reactor ◽  
Ammonia Removal ◽  
Nitrogen Loading ◽  
Single Stage ◽  
Biological Nitrogen Removal ◽  
External Circulation ◽  
Biological Nitrogen

An external circulation Sequencing Batch Reactor (ecSBR) was used to study the efficiency of nitrogen removal by autotrophic microbe. With gradually reducing the dissolved oxygen (DO) concentration from 1.2 mg/L to 0.04 mg/L, the single-stage autotrophic biological nitrogen removal (sABNR) process could be operated stably. After removing the aeration, the process could still stay sABNR stably, and the concentration of NH4+-N was 0.9 mg/L in effluent, the rate of nitrate (produced)/NH4+-N (removed) was in the range of 0.12–0.40. The results showed that the concentration of NH4+-N in effluent was 0.8, 0.8 and 9.9 mg/L with the hydraulic retention time (HRT) at 8 h, 6 h and 4 h respectively, the removal efficiency of ammonia were 98.2%, 98.1% and 73.6% respectively. The rate of nitrate (produced)/NH4+-N (consumed) was 0.05 at HRT 6 h, and the nitrogen loading rate (NLR) and nitrogen removal rate (NRR) were 169.7 and 129.7 g/m3/d, the removal efficiency of total nitrogen (TN) was 77.5%. In conclusion the optimal HRT was 6 h instead of 8 h or 4 h enough for ammonia removal without causing energy wastage. 

Total nitrogen concentration in leaves of potatoes (Solanum tuberosumL.) as an index of nutritional status

1976 ◽  
Vol 87 (2) ◽  
pp. 293-296 ◽  
Author(s):  
A. Gupta ◽  
M. C. Saxena
Keyword(s):  
Total Nitrogen ◽  
Tuber Yield ◽  
Critical Concentration ◽  
Nitrogen Concentration ◽  
Curvilinear Relationship ◽  
N Application ◽  
Total N ◽  
Potato Plants ◽  
N Concentration ◽  
Total Nitrogen Concentration

SummaryLeaf samples were collected, at weekly intervals, throughout the growing season, from potato (Solanum tuberosumL.) plants supplied with varying amounts of nitrogen (0, 60, 120, 180 and 240 kg N/ha) and analysed for total N. Application of nitrogen increased the N concentration in the green leaves at all stages of growth. There was a significant curvilinear relationship between the final tuber yield and the total N concentration in the leaves at 48–90 days after planting in 1968–9 and at 79–107 days after planting in 1969–70. The N concentration at 70–90 days after planting was consistently related to the final tuber yield in both years. Thus this period was ideal for assessing the nitrogen status of potato plants. The critical concentration of total nitrogen generally decreased with advance in age. It ranged from 4·65% at 76 days to 3·30% at 90 days during 1968–9, whereas in 1969–70 it ranged from 4·20% at 79 days to 3·80% at 93 days. During the period from 83 to 86 days the critical percentage was around 3·6% in both the years.

Degradation of wine distillery wastewaters by the combination of aerobic biological treatment with chemical oxidation by Fenton's reagent

2005 ◽  
Vol 51 (1) ◽  
pp. 167-174 ◽  
Author(s):  
J. Beltran de Heredia ◽  
J. Torregrosa ◽  
J.R. Dominguez ◽  
E. Partido
Keyword(s):  
Chemical Oxygen Demand ◽  
Aromatic Compounds ◽  
Biological Treatment ◽  
Batch Reactor ◽  
Oxygen Demand ◽  
Chemical Oxidation ◽  
Utilization Rate ◽  
Fenton’S Reagent ◽  
Kinetic Rate Constant ◽  
Fenton's Reagent

The degradation of wine distillery wastewaters by aerobic biological treatment has been investigated in a batch reactor. The evolution of the chemical oxygen demand, biomass and total contents of polyphenolic and aromatic compounds was followed through each experiment. According to the Contois model, a kinetic expression for the substrate utilization rate is derived, and its biokinetic constant is evaluated. The final effluents of the aerobic biological experiments were oxidized by Fenton's reagent. The evolution of chemical oxygen demand, hydrogen peroxide concentration and total contents of polyphenolic and aromatic compounds was followed through each experiment. A kinetic model to interpret the experimental data is proposed. The kinetic rate constant of the global reaction is determined.

Research on Nitrogen Removal Performance of Leachate Treatment of WSIP Reactor

2011 ◽  
Vol 55-57 ◽  
pp. 789-795
Author(s):  
Xiu Ju Duan ◽  
Qiang He ◽  
Ya Li Liu
Keyword(s):  
Nitrogen Removal ◽  
Biological Treatment ◽  
Orthogonal Experiment ◽  
Ammonia Nitrogen ◽  
Ammonia Removal ◽  
Leachate Treatment ◽  
Treatment Performance ◽  
Biomass Retention ◽  
Nitrification And Denitrification

This thesis put forward the treatment concept of “without Biomass Retention Sequential Batch Intensified Pretreatment (WSIP)” in leachate treatment, for sake of improving performance of nitrogen removal, optimizing excess water’s nutritional ratio and benefitting the follow-up aerobic biological treatment. Based on orthogonal experiment of WSIP Reactor’s leachate treatment performance, Conclusions can be drew: the removal performance of ammonia nitrogen and TN is higher of WSIP, in which short-cut nitrification and denitrification can be realized; HRT, DO and sequential period are remarkable factors of ammonia removal performance, TN removal performance and realization of short-cut nitrification and denitrification; In normal temperature, the most perfect functional parameter of WSIP Reactor is: HRT=4d, DO=0.75mg/L and sequential period is 6h.

Sign in / Sign up

Export Citation Format

Share Document