Microbial Reduction of Hexavalent Chromium in Landfill Leachate

2004 ◽  
Vol 57 (10) ◽  
pp. 967 ◽  
Author(s):  
Yarong Li ◽  
Gary K.-C. Low ◽  
Ying Lei ◽  
Cheryl E. Halim ◽  
Rose Amal
Keyword(s):  
Hexavalent Chromium ◽  
Landfill Leachate ◽  
Organic Material ◽  
Microbial Reduction ◽  
Landfill Leachates ◽  
Microbial Process ◽  
Chromium Vi ◽  
Alkaline Conditions ◽  
High Concentrations ◽  
Reducing Properties

Landfill leachates were found to exhibit reducing properties whereby chromium(vi) was converted into chromium(iii). The reduction is attributed to a microbial process in the presence of high concentrations of organic materials in the leachates. Nonputrescible landfill leachate (NPLL) was found to reduce CrVI to a lesser extent than the municipal landfill leachate (MLL). Microbial reduction of CrVI was also found to occur under alkaline conditions in extracts from a cementitious waste. A 55% reduction of CrVI was achieved by enriching the extract with bacteria and organic material.

Microbial reduction of hexavalent chromium by landfill leachate

2007 ◽  
Vol 142 (1-2) ◽  
pp. 153-159 ◽  
Author(s):  
Yarong Li ◽  
Gary K.-C. Low ◽  
Jason A. Scott ◽  
Rose Amal
Keyword(s):  
Hexavalent Chromium ◽  
Landfill Leachate ◽  
Microbial Reduction

scholarly journals Ammonia nitrogen desorption from sanitary landfill leachate in filling towers

2014 ◽  
Vol 34 (3) ◽  
pp. 542-553 ◽  
Author(s):  
Valderi D. Leite ◽  
Aldre J. M. Barros ◽  
Wilton S. Lopes ◽  
José T. de Sousa
Keyword(s):  
Landfill Leachate ◽  
Ammonia Nitrogen ◽  
Limiting Factors ◽  
Sanitary Landfill ◽  
Landfill Leachates ◽  
Desorption Process ◽  
Treatment Processes ◽  
Nitrogen Desorption ◽  
High Concentrations ◽  
Sanitary Landfill Leachate

Sanitary landfill leachates present high concentrations of carbonaceous and nitrogenous materials. The crucial point is that carbonaceous materials are of difficult biodegradation, what compromises the performance of biological treatment processes, while nitrogenous materials, such as ammonia nitrogen, probably preclude the use of biological treatments. Therefore, the aim of this work was to study the desorption process of ammonia nitrogen from sanitary landfill leachate in filling towers. Desorption was carried out in filling towers of 35 L capacity. The leachate was collected from a sanitary landfill located in João Pessoa, Paraíba State, Brazil. Desorption efficiency for the pH values adopted in four treatments was 93% minimum and 95.5% maximum, with aeration mean time ranging from 3 to 6 hours. The limiting factors of ammonia nitrogen desorption from sanitary landfill leachates in filling towers are associated with the use of alkalizer species for pH correction, and electricity costs for aeration.

Breakthrough analysis for hexavalent chromium removal from drinking water in a fixed bed column

2009 ◽  
Vol 9 (6) ◽  
pp. 661-670 ◽  
Author(s):  
S. P. Dubey ◽  
K. Gopal
Keyword(s):  
Aqueous Solution ◽  
Hexavalent Chromium ◽  
Fixed Bed ◽  
Entropy Change ◽  
Spectroscopic Technique ◽  
Fixed Bed Column ◽  
Chromium Vi ◽  
Fixed Bed Adsorption ◽  
Optimal Column ◽  
Eucalyptus Bark

The activated carbon of Eucalyptus globulus was tested for their effectiveness in removing hexavalent chromium from aqueous solution using column experiments. Result revealed that adsorption of chromium(VI) on eucalyptus bark carbon was endothermic in nature. Thermodynamic parameters such as the entropy change, enthalpy change and Gibbs free energy change were found to be 1.39 kJ mol−1 K−1, 1.08 kJ mol−1 and −3.85 kJ mol−1, respectively. Different chromium concentrations were used for the fixed bed adsorption studies. The pre- and post-treated adsorbents were characterized using a FTIR spectroscopic technique. It was concluded that Eucalyptus bark carbon column could be used effectively for removal of hexavalent chromium from aqueous solution at optimal column conditions. This study showed that this biological material is potential adsorbent of Cr(VI) from water.

scholarly journals Characterizing Seasonal Variation in Landfill Leachate Using Leachate Pollution Index (LPI) at Nam Son Solid Waste Landfill in Hanoi, Vietnam

Environments ◽  
2021 ◽  
Vol 8 (3) ◽  
pp. 17
Author(s):  
Son Tran Hoai ◽  
Huong Nguyen Lan ◽  
Nga Tran Thi Viet ◽  
Giang Nguyen Hoang ◽  
Ken Kawamoto
Keyword(s):  
Environmental Pollution ◽  
Landfill Leachate ◽  
Pollution Index ◽  
Temporal Variations ◽  
Inorganic Pollutants ◽  
Landfill Leachates ◽  
Leachate Treatment ◽  
Waste Landfill ◽  
Permissible Limits ◽  
Leachate Pollution Index

The improper treatment of landfill leachates is one of the major problems associated with waste landfilling and causes serious environmental pollution at waste landfill sites and their surroundings. To develop a suitable landfill leachate treatment system and to minimize the risk of environmental pollution, it is important to characterize seasonal and temporal variations of landfill leachates. This study investigated the leachate quality of the Nam Son waste landfill in Hanoi, Vietnam in 2017–2019 and characterized the potential risks of landfill leachate using a leachate pollution index (LPI). The results of this study showed that the seasonal and temporal variation of the overall LPI during the monitoring period was small and in the range of 20–25 (values 2.5 times higher than the maximum permissible limits of Vietnam National Technical Regulation on Industrial Wastewater). The LPI sub-indices attributed to organic and inorganic pollutants were major components of the LPI. Especially, the annually averaged values of LPI of inorganic pollutants were 7.7 times higher than the maximum permissible limits, suggesting that the treatment of inorganic pollutants, such as ammonium-nitrogen (NH4+–N) and total nitrogen (TN), is highly required at Nam Son landfill to prevent environmental pollution surrounding the landfill site.

Hexavalent Chromium (VI) Removal by Aspergillus niger

2017 ◽  
pp. 673-688
Author(s):  
Ismael Acosta-Rodriguez ◽  
Juan F. Cardenas-González ◽  
María de Guadalupe Moctezuma-Zárate ◽  
Adriana Rodriguez Perez ◽  
Victor M. Martínez-Juárez
Keyword(s):  
Aspergillus Niger ◽  
Hexavalent Chromium ◽  
Chromium Vi

scholarly journals CHARACTERISTICS OF LEACHATE AT IHIAGWA DUMPSITE, IMO STATE NIGERIA AND THEIR IMPLICATIONS FOR SURFACE WATER POLLUTION

2021 ◽  
pp. 1-11
Author(s):  
CT Nelson ◽  
GT Amangabara ◽  
CO Owuama ◽  
CN Nzeh ◽  
CN Uyo
Keyword(s):  
Heavy Metals ◽  
Chemical Properties ◽  
Total Solid ◽  
Toxic Substances ◽  
Landfill Leachates ◽  
Total Chloride ◽  
Metal Cyanide ◽  
Physico Chemical ◽  
High Concentrations ◽  
Total Dissolved Solid

Open dumpsite is the most common way to eliminate solid urban wastes in this part of the world. An important problem associated to landfills and open dumpsite is the production of leachates. The leachates from these dumpsites have many toxic substances, which may adversely affect the environmental health. Thus in order to have a better management of characteristics of Ihiagwa-Nekede waste dump leachates, representative leachate samples were collected and analyzed for Physico-chemical properties and levels of heavy metals in them. Results indicate pH7.38, temperature 28.30 ℃ - 28.40℃, total dissolved solid 124.01mg/l-125.45mg/l, magnesium hardness 4.40mg/l-7.32mg/l, sulphate 3.60mg/l-3.70mg/l, and nitrate 27.00mg/l-27.60mg/l. Other parameters indicated as follows Conductivity1910𝜇𝑠/𝑐𝑚-1930.00 𝜇𝑠/𝑐𝑚, total chloride 891.72mg/l-891.74mg/l, carbonate 1708.00mg/l-1904.00mg/l, Ammonia 9.39mg/l-9.40mg/l, calcium hardness 373.17mg/l-375.61mg/l, total solid 2423.00mg/l-2454.00mg/l, phosphate 13.52mg/l-13.54mg/l. The heavy metal: cyanide 2.25mg/l-2.33mg/l, zinc 18.08mg/l-18.38mg/l, copper 19.90mg/l20.48mg/l, iron10.67mg/l-10.82mg/l, lead 1.27mg/l-1.41mg/l, and manganese 3.00mg/l-3.61mg/l, all these exceeded the WHO standards. The obtained results showed that the landfill leachates are characterized by high concentrations of heavy metals and other disease causing elements and therefore require urgent treatment to forestall the contamination of groundwater system and the nearby Otamiri River.

scholarly journals Pennisetum sinese: A Potential Phytoremediation Plant for Chromium Deletion from Soil

2020 ◽  
Vol 12 (9) ◽  
pp. 3651
Author(s):  
Xiaofei Chen ◽  
Jianhua Tong ◽  
Yi Su ◽  
Langtao Xiao
Keyword(s):  
Biomass Energy ◽  
Raw Material ◽  
Chromium Removal ◽  
High Accumulation ◽  
Chromium Vi ◽  
Livestock Feed ◽  
Low Concentrations ◽  
Plantlet Growth ◽  
Mushroom Culture ◽  
High Concentrations

Chromium is one of the major pollutants in water and soil. Thus, it is urgent to develop a new method for chromium removal from the environment. Phytoremediation is a promising approach for heavy metal pollution recovery. As a perennial giant grass with a fast growth rate, Pennisetum sinese has been widely used as livestock feed, mushroom culture medium and biomass energy raw material. Interestingly, we have found a high adsorption capacity of P. sinese for chromium. P. sinese was treated with different concentrations of chromium for 15 days. Results showed that P. sinese plantlets grew well under low concentrations (less than 500 μM) of chromium (VI). The plantlet growth was inhibited when treated with high concentrations of chromium (more than 1000 μM). Up to 150.99 and 979.03 mg·kg−1 DW of chromium accumulated in the aerial part and root, respectively, under a treatment of 2000 μM Cr. The bioaccumulation factor (BCF) of P. sinese varied from 10.87 to 17.56, and reached a maximum value at the concentration of 500 μM. The results indicated that P. sinese showed strong tolerance and high accumulation capability under Cr stress. Therefore, the chromium removal potential of P. sinese has a great application prospect in phytoremediation.

Microbial Reduction of Hexavalent Chromium under Vadose Zone Conditions

2003 ◽  
Vol 32 (1) ◽  
pp. 317-324 ◽  
Author(s):  
Douglas S. Oliver ◽  
Fred J. Brockman ◽  
Robert S. Bowman ◽  
Thomas L. Kieft
Keyword(s):  
Hexavalent Chromium ◽  
Vadose Zone ◽  
Microbial Reduction
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