scholarly journals The comparison of efficiency of Fenton and photo-Fenton treatment of stabilised landfill leachate / Porównanie efektywności oczyszczania odcieków z ustabilizowanego składowiska odpadów komunalnych w procesie Fentona i foto-Fentona

2015 ◽  
Vol 26 (3) ◽  
pp. 49-53 ◽  
Author(s):  
Anna Kwarciak-Kozłowska ◽  
Aleksandra Krzywicka
Keyword(s):  
Landfill Leachate ◽  
Fenton Reaction ◽  
Ferrous Sulphate ◽  
Oxygen Demand ◽  
Ammonia Nitrogen ◽  
Ammonia Removal ◽  
Mass Ratio ◽  
Leachate Treatment ◽  
Initial Ph ◽  
Removal Efficiencies

Abstract The goal of this article was to compare the efficiency of Fenton and photo-Fenton reaction used for stabilised landfill leachate treatment. The mass ratio of COD:H2O2 was fixed to 1:2 for every stages. The dose of reagents (ferrous sulphate/hydrogen peroxide) was different and ranged from 0.1 to 0.5. To determine the efficiency of treatment, the BOD (biochemical oxygen demand COD (chemical oxygen demand), TOC (total organic carbon) , ammonia nitrogen and BOD/COD ratio was measured. The experiment was carried out under the following conditions: temperature was 25ºC, the initial pH was adjusted to 3.0. Every processes were lasting 60 minutes. The most appropriate dose of reagents was 0.25 (Fe2+/H2O2). It was found that the application of UV contributed to increase of COD, TOC and ammonia removal efficiencies by an average of 14%.

scholarly journals Treatment of Leachate Using Up-Flow Anaerobic Sludge Blanket Reactors/Vertical Flow Subsurface Constructed Wetlands

2020 ◽  
Vol 27 (1) ◽  
pp. 129-137
Author(s):  
Şevket Tulun
Keyword(s):  
Total Nitrogen ◽  
Landfill Leachate ◽  
Oxygen Demand ◽  
Ammonia Nitrogen ◽  
Organic Content ◽  
Ammonia Removal ◽  
Anaerobic Sludge ◽  
Vertical Flow ◽  
Physico Chemical ◽  
Anaerobic Sludge Blanket

AbstractThe composition of local solid waste consists mainly of biodegradable waste with high moisture and organic content. After being landfilled, the waste decomposes through a series of combined physico-chemical and biological processes, resulting in the generation of landfill leachate. Unless treated properly, the leachate poses a serious threat to the environment and to public health. In this study, the use of an engineered system consisting of an up-flow anaerobic sludge blanket reactor and a vertical flow subsurface constructed wetland for the treatment of landfill leachate was investigated. The leachate obtained from a landfill facility in Aksaray, Turkey was fed into both systems and laboratory tests showed that, over the 6-week study period, the systems were able to efficiently remove chemical oxygen demand (88.6 %) and total nitrogen (80.7 %). The results of this study suggested that Typha angustifolia significantly increased the removal of total nitrogen. The higher ammonia removal occurred in the anaerobic system and also the removal efficiency increased in planted bed, it is presumed to be the result of the ammonia nitrogen uptake by the roots of the plant.

scholarly journals Enhancement of COD, ammonia, phosphate and sulfide simultaneous removal by the anaerobic photosynthetic bacterium of Ectothiorhodospira magna in batch and sequencing batch culture

2018 ◽  
Vol 78 (9) ◽  
pp. 1852-1860 ◽  
Author(s):  
Xin Zhao ◽  
Xuejie Li ◽  
Nan Qi ◽  
Zhongtian Fu ◽  
Meng Chen ◽  
...  
Keyword(s):  
Batch Culture ◽  
Water Purification ◽  
Oxygen Demand ◽  
Photosynthetic Bacterium ◽  
Ammonia Nitrogen ◽  
Simultaneous Removal ◽  
Initial Ph ◽  
Photosynthetic Microorganism ◽  
Removal Efficiencies ◽  
First Time

AbstractAn anaerobic photosynthetic bacterium, with chemical oxygen demand (COD), ammonia nitrogen (NH3-N), total phosphorus (TP) and sulfide (S2−) simultaneous removal ability, strain SU6, was isolated and identified as belonging to Ectothiorhodospira magna. Its removal efficiencies were simultaneously evaluated in batch culture and influenced in sequencing batch culture. The maximum COD, NH3-N, TP and S2− removal rates of 93.04%, 86.70%, 37.55% and 99.99% were obtained in batch culture with an initial pH 8.0 at 35 °C after 72 h. The simultaneous removal efficiency was enhanced in sequencing batch culture, and 789.27 mg/L COD, 68.91 mg/L NH3-N, 70.20 mg/L S2− and 5.26 mg/L TP were removed by the end of the last cycle within 24 h. This was the first time of reporting contaminants' simultaneous removal by a pure-cultured photosynthetic bacterium. The experimental results demonstrate that E. magna can efficiently serve as a good candidate in anaerobic wastewater contaminants' simultaneous removal, and maybe as another model anaerobic photosynthetic microorganism for water purification investigations.

Effects of ion exchange resins in different mobile ion forms on semi-aerobic landfill leachate treatment

2010 ◽  
Vol 61 (3) ◽  
pp. 641-649 ◽  
Author(s):  
Mohammed J. K. Bashir ◽  
Hamidi Abdul Aziz ◽  
Mohd Suffian Yusoff ◽  
A. A. M. Huqe ◽  
Soraya Mohajeri
Keyword(s):  
Ion Exchange ◽  
Landfill Leachate ◽  
Oxygen Demand ◽  
Ammonia Nitrogen ◽  
Ion Exchange Resins ◽  
Leachate Treatment ◽  
Cationic Resin ◽  
Exchange Resins ◽  
Sodium Form ◽  
Cationic Exchanger

Landfill leachate is one of the major contamination sources. In this study, the ability of synthetic ion exchange resins which carry different mobile ion for removing color, chemical oxygen demand (COD), and ammonia nitrogen (NH3-N) from stabilized leachate was investigated. The synthetic resin INDION 225 Na as a cationic exchanger and INDION FFIP MB as an anionic exchanger were used in this study. INDION 225 Na was used in hydrogen form (H+) and in sodium form (Na+), while INDION FFIP MB resin was used in hydroxide form (OH−) and in calcium form (Cl−) form. The results indicated better removal of color, COD and NH3-N by using INDION 225 Na in H+ as compared with Na+ form, while no performance differences were observed by using INDION FFIP MB in OH− or Cl− form. Applying cationic resin followed by anionic resin achieved 97, 88 and 94, percent removal of color, COD and NH3-N. The residual amounts were 160 Pt-Co, 290 mg/L and 110 mg/L of color, COD and NH3-N respectively.

Landfill leachate treatment using the sequencing batch biofilm reactor method integrated with the electro-Fenton process

2014 ◽  
Vol 68 (6) ◽  
Author(s):  
Dao-Bin Zhang ◽  
Xiao-Gang Wu ◽  
Yi-Si Wang ◽  
Hui Zhang
Keyword(s):  
Landfill Leachate ◽  
Oxygen Demand ◽  
Ammonia Nitrogen ◽  
Biological Oxygen Demand ◽  
Biofilm Reactor ◽  
Electrolysis Time ◽  
Fenton Process ◽  
Optimal Conditions ◽  
Leachate Treatment ◽  
Sequencing Batch Biofilm Reactor

AbstractA study was conducted on the treatment of landfill leachate by combining the sequencing batch biofilm reactor (SBBR) method with the electro-Fenton method. The reduction of chemical oxygen demand (COD), biological oxygen demand (BOD5), and ammonia nitrogen (NH4+-N) from the leachate by the SBBR method was investigated. For the electro-Fenton experiment, the changes in COD and total organic carbon (TOC) with the increase in H2O2 dosage and electrolysis time under optimal conditions were also analysed. The results showed that the average efficiencies of reduction of COD, BOD5, and NH4+ -N achieved using the SBBR method were 21.6 %, 54.7 %, and 56.1 %, respectively. The bio-effluent was degraded by the subsequent electro-Fenton process, which was rapid over the first 30 min then subsequently slowed. After 60 min of the electro-Fenton treatment, the efficiencies of reduction of TOC, COD, and BOD5 were 40.5 %, 71.6 %, and 61.0 %, respectively. There is a good correlation between the absorbance of leachate at 254 nm (UV254) and COD or TOC during the electro-Fenton treatment.

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.

Ocean bacteria: performance on CODCr and NH4+-N removal in landfill leachate treatment

2015 ◽  
Vol 71 (6) ◽  
pp. 817-822
Author(s):  
Yali Feng ◽  
Aifei Yi ◽  
Haoran Li ◽  
Weida Wang ◽  
Yunlong Du
Keyword(s):  
Landfill Leachate ◽  
Oxygen Demand ◽  
Test Results ◽  
Leachate Treatment ◽  
N Removal ◽  
Redox Active ◽  
Laboratory Test Results ◽  
Ocean Sediment ◽  
Initial Ph ◽  
Oxygen Condition

An experiment was carried out to investigate the performance of mixed ocean bacteria, isolated from the ocean sediment, on landfill leachate treatment. In this treatment, ocean bacteria were the only constituent added to remove organics and NH4+-N. Given their considerable influence on wastewater purification, factors such as inoculum, initial pH, processing time and oxygen condition, were directly involved in this research. As indicated by laboratory test results, chemical oxygen demand (CODCr) and NH4+-N removal could reach 94.45% and 67.87%, respectively, after 3 days of treatment, in conditions of natural pH 6.3 and with the application of oxygen. The volt–ampere characteristics of the bacteria solution verified the redox-active ability of the bacteria in landfill leachate treatment.

scholarly journals Molecular weight distribution of pollutants in leachate from full scale landfill site

2016 ◽  
Vol 18 (2) ◽  
pp. 360-370
Keyword(s):  
Molecular Weight ◽  
Molecular Weight Distribution ◽  
Landfill Leachate ◽  
Weight Distribution ◽  
Oxygen Demand ◽  
Ammonia Nitrogen ◽  
Treatment Technology ◽  
Leachate Treatment ◽  
Treatment Processes ◽  
Appropriate Treatment

<div> <p>The main objective of this study was to investigate the differences between the main pollutants in young and intermediate age landfill leachate in terms of molecular weight distribution (MWD). Parameters of chemical oxygen demand (COD), five day - biochemical oxygen demand (BOD<sub>5</sub>), ultraviolet-visible spectrophotometry (UV-VIS spectrum), total kjehldahl nitrogen (TKN), ammonia nitrogen (NH<sub>4</sub>-N) and colour were fractioned by membranes with the nominal pore size of 1&micro;m, 0.05 &micro;m, 100 kDa, 50 kDa, 10 kDa, 1 kDa and 0.5 kDa. According to the MWD results appropriate treatment technology could be choosen easily. According to the MWD results the ratio of soluble fractions (&lt; 0.5 kDa) to total COD was 34% in young leachate (YL), whereas low molecular weight (MW) fractions were dominant in intermediate leachate (IL) having this ratio of 71%. Presence of lower MW compounds in IL was also confirmed with UV-VIS absorbance spectra and its spectrum was higher than the YL. According to the specific ultraviolet absorption (SUVA) values, the organic contents of all of these processes were hydrophilic. TKN and NH<sub>4</sub>-N analysis showed that in IL all the nitrogen present is in ammoniacal form, instead in YL there is still the presence of organic nitrogen. Furthermore more than half of the TKN was less than 0.5 kDa while 6 % and 16 % TKN found in wastewater from IL and YL was higher than 1 &micro;m respectively. The observations of this study may provide useful criteria to choose a suitable landfill leachate treatment processes.</p> </div> <p>&nbsp;</p>

Management and treatment of landfill leachate by a system of constructed wetlands and ponds in Singapore

2013 ◽  
Vol 68 (5) ◽  
pp. 1114-1122 ◽  
Author(s):  
C. H. Sim ◽  
B. S. Quek ◽  
R. B. E. Shutes ◽  
K. H. Goh
Keyword(s):  
Water Quality ◽  
Landfill Leachate ◽  
Oxygen Demand ◽  
Treatment System ◽  
Plant Management ◽  
Leachate Treatment ◽  
Reed Beds ◽  
Treated Effluent ◽  
Removal Efficiencies ◽  
Pre Treatment

Lorong Halus, Singapore's first landfill leachate treatment system, consists of a pre-treatment system (8,000 m2), five constructed reed beds (38,000 m2), five polishing ponds (13,000 m2), an education centre and a learning trail for visitors. Eight species of wetland plants (total 160,000 plants) were selected for their ability to uptake nutrients, tolerance to low phosphorus concentrations and resistance to pest infestations. The wetland was launched in March 2011 and water quality monitoring started in April 2011. The removal efficiencies of the pre-treatment system from April 2011 to August 2012 are biochemical oxygen demand (BOD5) 57.4%; chemical oxygen demand (COD) 23.6%; total suspended solids (TSS) 55.1%; ammoniacal nitrogen (NH4-N) 76.8%; total phosphorus (TP) 33.3% and total nitrogen (TN) 60.2%. Removal efficiencies of the reed beds are BOD5 47.0%; COD 42.2%; TSS 57.0%; NH4-N 82.5%; TP 29.3% and TN 83.9%. Plant growth is generally satisfactory, but the lower than designed volume of leachate has adversely affected some sections of plants and resulted in uneven flow distribution in reed beds. The plant management programme includes improving plant regrowth by harvesting of alternate strips of plants and replanting. The treated effluent meets water quality limits for discharge to the public sewer and is subsequently treated by the NEWater treatment system, which recycles water for industrial and indirect potable use.

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.

scholarly journals Electricity generation and pollutants removal of landfill leachate by osmotic microbial fuel cells with different forward osmosis membranes

2021 ◽  
Author(s):  
Nan Jiang ◽  
Li Huang ◽  
Manhong Huang ◽  
Teng Cai ◽  
Jialing Song ◽  
...  
Keyword(s):  
Fuel Cells ◽  
Active Layer ◽  
Landfill Leachate ◽  
Microbial Fuel Cells ◽  
Forward Osmosis ◽  
Feed Solution ◽  
Cellulose Triacetate ◽  
Ammonia Nitrogen ◽  
Pollutant Removal ◽  
Leachate Treatment

Abstract In this study, thin-film composite with embedded polyester screen, cellulose triacetate with a cast nonwoven and cellulose triacetate with embedded polyester screen (CTA-ES) were examined as the intermediate membranes in osmotic microbial fuel cells (OsMFCs). The reactors were fed with actual landfill leachate and the performance was studied in two operation modes: active layer facing draw solution and active layer facing feed solution (AL-FS). The OsMFC with CTA-ES exhibited the best energy generation (maximum power density: 0.44 W m-2) and pollutant removal efficiency (ammonia nitrogen: 70.12 ± 0.28%, total nitrogen: 74.04 ± 0.33%) in the AL-FS mode, which could be ascribed to the lowest internal resistance (236.75 ohm) and highest microbial richness. Pseudomonas was the highest proportion of microbial in OsMFCs. The results of this study has demonstrated the potential of OsMFCs for landfill leachate treatment.

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