scholarly journals Application of surface response method (RSM) to optimize ammonia nitrogen removal from fresh leachate using combination of ultrasound and ultraviolet

2020 ◽  
Vol 81 (2) ◽  
pp. 358-366 ◽  
Author(s):  
Mohammad Hasan Zarghi ◽  
Neamat Jaafarzadeh ◽  
Aliakbar Roudbari ◽  
Amir Zahedi
Keyword(s):  
Removal Efficiency ◽  
Nitrogen Removal ◽  
Landfill Leachate ◽  
Ultraviolet Irradiation ◽  
Contact Time ◽  
Ammonia Nitrogen ◽  
Quadratic Model ◽  
Nitrogen Levels ◽  
Ultrasound Frequency ◽  
Response Method

Abstract Ammonia nitrogen levels are very high in leachate. This study was conducted to optimize the removal of ammonia nitrogen from fresh landfill leachate using a combination of ultrasound waves and ultraviolet irradiation. A sample of fresh landfill leachate was obtained from a municipal landfill site, located in Shahroud (Semnan, Iran) and its ammonia nitrogen was measured by spectrophotometric method. Ultrasound and ultraviolet irradiation were simultaneously used to remove ammonia nitrogen. Box–Behnken design (BBD) based on response surface method (RSM) was applied to analyze and optimize ammonia nitrogen removal by different variables, including pH, contact time, ultrasound frequency and UV intensity. Based on this method, 29 samples with three replications were tested. The analysis of variance indicated quadratic model was significant for removal of ammonia nitrogen from leachate. According to the model, 99.7% removal efficiency (%) of ammonia nitrogen was obtained in the optimal conditions (pH at 9.7, contact time of 59.1 min, ultrasound frequency of 54 kHz and UV intensity of 40 W). The removal efficiency of ammonia nitrogen was obtained 98.6% from the laboratory experiment in these conditions, which agrees well with the predicted response value.

Removal of Ammonia Nitrogen from Landfill Leachate by Ultrasound/Ultraviolet Process

2013 ◽  
Vol 448-453 ◽  
pp. 536-539
Author(s):  
Bin Liu ◽  
Xu Ya Peng ◽  
Qi Tian ◽  
Hua Zhao
Keyword(s):  
Removal Efficiency ◽  
Nitrogen Removal ◽  
Landfill Leachate ◽  
Nitrogen Concentration ◽  
Ammonia Nitrogen ◽  
Aeration Rate ◽  
Ammonia Removal ◽  
Ultrasonic Power ◽  
High Concentration ◽  
Leachate Treatment

Landfill leachate treatment is a major problem to be solved in the field of environmental protection, and ammonia nitrogen is one of the major pollutants in landfill leachate, whose processing technology needs further improvement. In this paper, ultrasound/ultraviolet co-oxidation technology was directly applied to the treatment of high concentration landfill leachate without the pretreatment operations of dilution, filter, and adjusting the pH conditions. The results showed that: ultrasonic and ultraviolet had certain effects on the ammonia nitrogen removal, and the ammonia nitrogen removing effects became better when the ultrasonic power was greater, or the ultraviolet wavelength was shorter. When the ultrasonic power was 100 W, the ammonia nitrogen removal efficiency was 25.2%, and the UV of 254 nm could decompose 20.2% of the ammonia nitrogen in landfill leathate. In the condition of aeration, ultrasonic and ultraviolet had good synergistic effect on leachate ammonia nitrogen treatment. When the ultrasonic power was 100 W, UV wavelength was 254 nm, and the aeration rate was 150 L/h, the ammonia removal efficiency of high concentration leachate (ammonia nitrogen concentration of 1800 mg/L) reached 98.5% after 6 hours. The paper's research results provide a useful reference for the removal of landfill leachate ammonia nitrogen.

Combined organic carbon and complete nitrogen removal using anaerobic and aerobic upflow filters

1994 ◽  
Vol 30 (12) ◽  
pp. 297-306 ◽  
Author(s):  
Joseph Akunna ◽  
Claude Bizeau ◽  
René Moletta ◽  
Nicolas Bernet ◽  
Alain Héduit
Keyword(s):  
Organic Carbon ◽  
Removal Efficiency ◽  
Nitrogen Removal ◽  
Nitrogen Loss ◽  
Ammonia Nitrogen ◽  
Cod Removal ◽  
Cod Removal Efficiency ◽  
Treated Effluent ◽  
Treated Effluents ◽  
Aerobic And Anaerobic

Two laboratory upflow aerobic and anaerobic filters fed with synthetic wastewaters were used to study firstly the effects of aeration rate on the nitrification of anaerobically pre-treated effluents and secondly the effects of recycle-to-influent ratios on methane production rate, denitrification and nitrification performances of a combined aerobic and anaerobic wastewater treatment process. Nitrification of anaerobically pre-treated effluent was accompanied by aerobic post-treatment for residual COD removal. A comparison of nitrification performances using autotrophic medium and anaerobically pre-treated effluents (containing 1203 mg COD 1−1) with the same ammonia nitrogen concentration of about 300 mg NH4-N 1−1 showed that 3% of added ammonia nitrogen was assimilated by autotrophic nitrifiers during nitrification of the autotrophic medium while up to 30% was assimilated by both nitrifiers and heterotrophs during organic carbon removal and nitrification of anaerobically pre-treated effluent. Furthermore, it was suspected that significant nitrogen loss through denitrification occured in the aerobic filter especially at low aeration rates. In the study of the combined aerobic-anaerobic system, maximum ammonia nitrogen removal of 70% through denitrification was obtained at recycle-to-influent ratios of 4 and 5. COD removal efficiency in the anaerobic filter decreased from 77 to 60% for recycle-to-influent ratios of zero to 5. Overall COD removal efficiency of the entire system was constant at about 99% due to heterotrophic COD removal in the aerobic filter.

Phosphorus and Nitrogen Removal from Sewage by Modified Honeycomb Cinder

2013 ◽  
Vol 726-731 ◽  
pp. 2931-2935
Author(s):  
Qi Bin Liang ◽  
Yun Gen Liu ◽  
Kun Tian
Keyword(s):  
Nitrogen Removal ◽  
Phosphorus Removal ◽  
Contact Time ◽  
Low Cost ◽  
Ammonia Nitrogen ◽  
Domestic Sewage ◽  
Operating Conditions ◽  
Optimal Conditions ◽  
Batch Experiments ◽  
Adsorption Capacities

The study aimed at phosphorus and nitrogen removal by honeycomb cinder modified with Zinc chloride (ZnCl2). By bench-scale batch experiments, honeycomb cinders with different modification time and ZnCl2 dosage were modified and its adsorption capacities were evaluated by methylence blue as the adsorbate. Under the optimal modification conditions, large amount modified honeycomb cinders were prepared to remove the phosphorus and nitrogen from domestic sewage, which different operating conditions of honeycomb cinders dosage, and contact time were considered. The results show that removal efficiencies of total phosphate (TP), orthophosphate (PO43-P), total nitrogen (TN) and ammonia nitrogen (NH4+-N) could reach 89.9%, 96.7%, 18.9% and 23.3% under the optimal conditions, respectively. Modified honeycomb cinders might be an effective and low cost adsorbent for phosphorus removal.

The Ammonia Nitrogen Removal Enhanced by Biological Aerobic Filter Packed with a Novel Lightweight Zeolite Particles

2013 ◽  
Vol 361-363 ◽  
pp. 764-767
Author(s):  
Hai Tang ◽  
Long Ouyang ◽  
Xiang Zhao
Keyword(s):  
Removal Efficiency ◽  
Nitrogen Removal ◽  
Ammonia Nitrogen ◽  
Exponential Equation ◽  
N Concentration ◽  
N Removal ◽  
Optimal Value ◽  
Relationship Of ◽  
The Relationship

The ammonia nitrogen (NH4-N) removal enhanced by biological aerobic filter (BAF) packed with novel micro-mesoporous lightweight zeolite particles (LZP) as carrier. The results showed that the biofilm can quickly grow up using LZP as media in the BAF. HLR of 1.2 was chosen as the optimal value under the average influent NH4+-N concentration of 24.6 mg/L, percent NH4-N removal of 87% and NLR of 0.24 kgN/m3.d was achieved. The kinetic performance of the LZP-BAF indicated that the relationship of NH4-N removal efficiency with the L could be described by an exponential equation (Ce/Ci=exp (-1.24/L0.344)).

scholarly journals Comparative Study on Advanced Nitrogen Removal of Landfill Leachate Treated by SBR and SBBR

Water ◽  
2021 ◽  
Vol 13 (22) ◽  
pp. 3240
Author(s):  
Jinfeng Jiang ◽  
Liang Ma ◽  
Lianjie Hao ◽  
Daoji Wu ◽  
Kai Wang
Keyword(s):  
Total Nitrogen ◽  
Nitrogen Removal ◽  
Landfill Leachate ◽  
Batch Reactor ◽  
Nitrogen Concentration ◽  
Carbon Sources ◽  
Oxygen Demand ◽  
Ammonia Nitrogen ◽  
Two Systems ◽  
Advanced Nitrogen Removal

In order to achieve advanced nitrogen removal from landfill leachate without the addition of external carbon sources, a Sequencing Batch Reactor (SBR) and a Sequencing Biofilm Batch Reactor (SBBR) were proposed for the treatment of actual landfill leachate with ammonia nitrogen (NH4+-N) and chemical oxygen demand (COD) concentrations of 1000 ± 100 mg/L and 4000 ± 100 mg/L, respectively. The operating modes of both systems are anaerobic–aerobic–anoxic. After 110 days of start-up and biomass acclimation, the effluent COD and the total nitrogen (TN) of the two systems were 650 ± 50 mg/L and 20 ± 10 mg/L, respectively. The removal rates of COD and total nitrogen could reach around 85% and above 95%, respectively. Therefore, advanced nitrogen removal was implemented in landfill leachate without adding any carbon sources. After the two systems were acclimated, nitrogen removing cycles of SBR and SBBR were 24 h and 20 h, respectively. The nitrogen removing efficiency of SBBR was improved by 16.7% in comparison to SBR. In the typical cycle of the two groups of reactors, the nitrification time of the system was the same, which was 5.5 h, indicating that although the fiber filler occupied part of the reactor space, it had no significant impact on the nitrification performance of the system. At the end of aeration, the internal carbon source content of sludge of SBBR was equivalent to that of the SBR system. However, the total nitrogen concentration of SBBR was only 129 mg/L, which is 33.8% lower than that of SBR at 195 mg/L. The main reason was that biofilm enhanced the simultaneous nitrification and denitrification (SND) effect of the system.

scholarly journals Melamine-formaldehyde-silica and melamine-silica-cellulose composites in removing Iron and N-ammonia from landfill leachate

2021 ◽  
Vol 10 (12) ◽  
pp. e347101220602
Author(s):  
Evânia Carvalho dos Santos ◽  
Jarbas Soares de Mesquita Junior ◽  
Darlisson Slag Neri Silva ◽  
Francisco Cardoso Figueiredo ◽  
Rafael Marinho Bandeira ◽  
...  
Keyword(s):  
Removal Efficiency ◽  
Adsorption Kinetics ◽  
Landfill Leachate ◽  
Low Cost ◽  
Ammonia Nitrogen ◽  
Melamine Formaldehyde ◽  
Pollutant Load ◽  
Comparative Tests ◽  
Cellulose Composites

Melamine-formaldehyde based composites are versatile and can be applied in the treatment of contaminated effluents such as landfill leachate that have a high pollutant load, as they are rich in nitrogen atoms, the sites allow interaction with molecules, atoms or ions of interest. Aiming compares the efficiency of two materials based on the same precursors, evaluating the efficiency of two composites, melamine-silica (PMF-Si) and melamine-silica-cellulose (Cel-M-Si) in removing iron and ammonia nitrogen in landfill leachate. Adsorption kinetics showed that PMF-Si and Cel-M-Si composites adsorb iron from 30 min, with an average removal of ~ 93.4%. Application of Cel-M-Si to removed leachate ca. 75.7% iron and 76.6% ammonia nitrogen. In contrast, it was observed that PMF-Si had a removal efficiency of 70.9% for iron and 55.0% for ammonia nitrogen. The comparative tests allowed to conclude that the composites PMF-Si and Cel-M-Si have potential for the treatment of landfill leachate, being low cost materials and easy synthesis.

Studies on Anoxic Aerobic Alternate Frequency of Oxidation Ditch for Removing Nitrogen and Phosphorus

2012 ◽  
Vol 610-613 ◽  
pp. 1573-1578
Author(s):  
Yu Hong Zhou
Keyword(s):  
Removal Efficiency ◽  
Nitrogen Removal ◽  
Sequencing Batch Reactor ◽  
Batch Reactor ◽  
Operating Mode ◽  
Ammonia Nitrogen ◽  
Oxidation Ditch ◽  
Nitrogen And Phosphorus ◽  
Phosphorus Species ◽  
Biological Removal

Biological removal of nitrogen and phosphorus species from an artificial wastewater was investigated in a sequencing batch reactor ( SBR) by changing operating mode which simulation oxidation ditch aeration realization of point and achieved alternate anoxic/aerobic, The results show that: the total control for 6 h reaction time, including aeration 3 h, stop aeration 3 h, four conditions under the condition of 30 min, 10 min, 5 min, 3 min anoxic/ aerobic alternate of COD, ammonia nitrogen removal not too big effect, TN, TP influence is bigger. COD removal efficiency is above 89% for four modes and effluent COD is lower than 35mg/L.Ammonia nitrogen average removal efficiency is above 90% for four modes and effluent ammonia is less than 5mg/L.Total nitrogen removal rates was 68.71%, 67.70%, 60.36%, 37.27% respectively for four modes. In instantaneous influent, anoxic and aerobic alternating time should not be less than 5min for TN removal. Mode Ⅰto Ⅳ removal efficiency of TP was 23.05%, -2.17%, 1.19%, 43.61% respectively.

scholarly journals Efficient Utilization of Waste Carbon Source for Advanced Nitrogen Removal of Landfill Leachate

2017 ◽  
Vol 2017 ◽  
pp. 1-6 ◽  
Author(s):  
Kai Wang ◽  
Wenjun Yin ◽  
Fengxun Tan ◽  
Daoji Wu
Keyword(s):  
Carbon Source ◽  
Total Nitrogen ◽  
Nitrogen Removal ◽  
Landfill Leachate ◽  
Removal Rate ◽  
Batch Reactor ◽  
Critical Factor ◽  
Ammonia Nitrogen ◽  
The Real ◽  
Advanced Nitrogen Removal

A modified single sequencing batch reactor (SBR) was developed to remove the nitrogen of the real landfill leachate in this study. To take the full advantage of the SBR, stir phase was added before and after aeration, respectively. The new mechanism in this experiment could improve the removal of nitrogen efficiently by the utilization of carbon source in the raw leachate. This experiment adopts the SBR process to dispose of the real leachate, in which the COD and ammonia nitrogen concentrations were about 3800 mg/L and 1000 mg/L, respectively. Results showed that the removal rates of COD and total nitrogen were above 85% and 95%, respectively, and the effluent COD and total nitrogen were less than 500 mg/L and 40 mg/L under the condition of not adding any carbon source. Also, the specific nitrogen removal rate was 1.48 mgN/(h·gvss). In this process, polyhydroxyalkanoate (PHA) as a critical factor for the highly efficient nitrogen removal (>95%) was approved to be the primary carbon source in the sludge. Because most of the organic matter in raw water was used for denitrification, in the duration of this 160-day experiment, zero discharge of sludge was realized when the effluent suspended solids were 30–50 mg/L.

Effect of Activated Attapulgite on Ammonia-Nitrogen Removal

2012 ◽  
Vol 549 ◽  
pp. 92-95
Author(s):  
Fei Liu ◽  
Tao Hu ◽  
Shi Ying Ren ◽  
Ying Ying Shi
Keyword(s):  
Removal Efficiency ◽  
Nitrogen Removal ◽  
Microwave Power ◽  
Ph Value ◽  
Influence Factors ◽  
Ammonia Nitrogen ◽  
Heating Time

The removal of ammonia-nitrogen (NH4+–N) in water by activated attapulgite was investigated. The study focuses on the effect of different activated attapulgite. The influence factors include microwave power, heating time and pH value in solution. The results show that heating 4 minutes, microwave power of 89 watts, and pH value of 9 are the best conditions to remove NH4+-N in the wastewater and the removal efficiency can above 80%. The attapulgite activated by microwave and alkali can remove NH4+-N in breeding waste effectively and the removal efficiency can reach 84.15%.

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