scholarly journals Review of Nano Zero Valent Iron Oxidation and Alginate Beads for Degradation of Chemical Oxygen Demand and Turbidity in Wastewater

2020 ◽  
Keyword(s):  
Chemical Oxygen Demand ◽  
Iron Oxidation ◽  
Oxygen Demand ◽  
Alginate Beads ◽  
Zero Valent Iron ◽  
Nano Zero Valent Iron

Removal of hexavalent chromium using nano zero valent iron and bacterial consortium immobilized alginate beads in a continuous flow reactor

2018 ◽  
Vol 12 ◽  
pp. 104-114 ◽  
Author(s):  
Ravikumar K.V.G. ◽  
Shruthi Vathaluru Sudakaran ◽  
Mrudula Pulimi ◽  
Chandrasekaran Natarajan ◽  
Amitava Mukherjee
Keyword(s):  
Hexavalent Chromium ◽  
Continuous Flow ◽  
Flow Reactor ◽  
Bacterial Consortium ◽  
Alginate Beads ◽  
Zero Valent Iron ◽  
Continuous Flow Reactor ◽  
Nano Zero Valent Iron

scholarly journals Enriched Co-Treatment of Pharmaceutical and Acidic Metal-Containing Wastewater with Nano Zero-Valent Iron

Minerals ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 220
Author(s):  
Thobeka Pearl Makhathini ◽  
Jean Mulopo ◽  
Babatunde Femi Bakare
Keyword(s):  
Mine Drainage ◽  
Oxygen Demand ◽  
Cost Effective ◽  
Zero Valent Iron ◽  
Silica Sand ◽  
Reaction Products ◽  
Sulfate Removal ◽  
Total Dissolved Nitrogen ◽  
Nano Zero Valent Iron ◽  
Co Precipitation

Among traditional hazardous waste sources, pharmaceutical-containing wastewater and acidic mine drainage need treatment to preserve the expected water supply quality. A nano zero-valent iron (nZVI)-enriched treatment of these two streams is evaluated for simultaneous removal of various heavy metal ions, organic pollutants, sulfates, the efficiency of the treatment system, and separation of reaction products in the fluidized-bed reactor. The reactor packed with silica sand was inoculated with sludge from an anaerobic digester, then 1–3 g/L of nZVI slurry added to cotreat a hospital feed and acid mine wastewater at 5:2 v/v. The biotreatment process is monitored through an oxidation–reduction potential (Eh) for 90 days. The removal pathway for the nZVI used co-precipitation, sorption, and reduction. The removal load for Zn and Mn was approximately 198 mg Zn/g Fe and 207 mg Mn/g Fe, correspondingly; achieving sulfate (removal efficiency of 94% and organic matter i.e., chemical oxygen demand (COD), biological oxygen demand (BOD), dissolved organic carbon (DOC), total dissolved nitrogen (TDN) reduced significantly, but ibuprofen and naproxen achieved 31% and 27% removal, respectively. This enriched cotreatment system exhibited a high reducing condition in the reactor, as confirmed by Eh; hence, the nZVI was dosed only a few times in biotreatment duration, demonstrating a cost-effective system.

Organic-coated nanoparticulate zero valent iron for remediation of chemical oxygen demand (COD) and dissolved metals from tropical landfill leachate

2014 ◽  
Vol 21 (11) ◽  
pp. 7075-7087 ◽  
Author(s):  
S. S. R. M. D. H. R. Wijesekara ◽  
B. F. A. Basnayake ◽  
Meththika Vithanage
Keyword(s):  
Chemical Oxygen Demand ◽  
Landfill Leachate ◽  
Oxygen Demand ◽  
Zero Valent Iron ◽  
Dissolved Metals

REMOVAL OF DYE AND CHEMICAL OXYGEN DEMAND (COD) REDUCTION FROM TEXTILE INDUSTRIAL WASTEWATER USING HYBRID BIOREACTORS

2014 ◽  
Vol 13 (1) ◽  
pp. 43-50 ◽  
Author(s):  
Ghasem Najafpour Darzi ◽  
Reza Katal ◽  
Hossein Zare ◽  
Seyed Omid Rastegar ◽  
Poorya Mavaddat
Keyword(s):  
Chemical Oxygen Demand ◽  
Industrial Wastewater ◽  
Oxygen Demand ◽  
Cod Reduction

REDUCTION OF TOTAL SUSPENDED SOLIDS AND CHEMICAL OXYGEN DEMAND FROM PALM OIL MILL EFFLUENTS USING THE ELECTROCOAGULATION PROCESS

2015 ◽  
Vol 14 (12) ◽  
pp. 2897-2903
Author(s):  
Abdul Aziz Abdul Raman ◽  
Firdaus Ghazali ◽  
Shaliza Ibrahim ◽  
Diya'uddeen Basheer Hasan
Keyword(s):  
Chemical Oxygen Demand ◽  
Palm Oil ◽  
Suspended Solids ◽  
Oxygen Demand ◽  
Total Suspended Solids ◽  
Electrocoagulation Process ◽  
Palm Oil Mill

Spatio-temporal Variations in Water Quality Parameter Trends in River Waters

2018 ◽  
Vol 69 (10) ◽  
pp. 2940-2952 ◽  
Author(s):  
Martina Zelenakova ◽  
Pavol Purcz ◽  
Radu Daniel Pintilii ◽  
Peter Blistan ◽  
Petr Hlustik ◽  
...  
Keyword(s):  
Water Quality ◽  
Chemical Oxygen Demand ◽  
Quality Indicators ◽  
Water Resource Management ◽  
Oxygen Demand ◽  
Temporal Variations ◽  
Water Quality Parameter ◽  
Agricultural Activity ◽  
Water Quality Indicators ◽  
Nitrite Nitrogen

Evaluating trends in water quality indicators is a crucial issue in integrated water resource management in any country. In this study eight chemical and physical water quality indicators were analysed in seven river profiles in the River Laborec in eastern Slovakia. The analysed water quality parameters were biochemical oxygen demand (BOD5), chemical oxygen demand (CODCr), pH, temperature (t), ammonium nitrogen (NH4+-N), nitrite nitrogen (NO2--N), nitrate nitrogen (NO3--N), and total phosphorus (TP). Data from the monitored indicators were provided by the Ko�ice branch of the Slovakian Water Management Company, over a period of 15 years from 1999 to 2013. Mann�Kendall non-parametric statistical test was used for the trend analysis. Biochemical and chemical oxygen demand, ammonium and nitrite nitrogen content exhibit decreasing trends in the River Laborec. Decreasing agricultural activity in the area has had a significant impact on the trends in these parameters. However, NO2--N was the significant parameter of water quality because it mostly exceeds the limit value set in Slovak legislation, Regulation No. 269/2010 Coll. In addition, water temperature revealed an increasing trend which could be caused by global increase in air temperature. These results indicate that human activity significantly impacts the water quality.

Nano Zero Valent Iron Composites for Water Decontamination: A Review

2018 ◽  
Vol 5 (2) ◽  
pp. 88-101
Author(s):  
Nivedita Shukla ◽  
Amit Saxena ◽  
Vatsana Gupta ◽  
Ashok Singh Rawat ◽  
Sarita Shrivastava ◽  
...  
Keyword(s):  
Zero Valent Iron ◽  
Water Decontamination ◽  
Nano Zero Valent Iron

Treatment of a complex landfill leachate with peat

1978 ◽  
Vol 5 (1) ◽  
pp. 83-97 ◽  
Author(s):  
Robert D. Cameron
Keyword(s):  
Chemical Oxygen Demand ◽  
Ferric Chloride ◽  
Landfill Leachate ◽  
Metal Removal ◽  
Oxygen Demand ◽  
Treatment Method ◽  
Manganese Concentration ◽  
Chemical Pretreatment ◽  
Iron Manganese

The use of cheap, locally available peat as a treatment method for landfill leachate was investigated by passing leachate through plexiglass columns filled with an amorphous-granular peat. Preliminary adjustment of pH showed that reducing pH to 4.8 dramatically reduced adsorption. Increasing the pH to 8.4, metal removal was increased owing to filtration of precipitated metals. The best adsorption of metals occurred at the 'natural' pH of 7.1. Manganese was found to be the limiting pollutant. At the 0.05 mg/ℓ maximum acceptable manganese concentration 94% of the total metals were removed, requiring 159 kg of peat per 1000 ℓ of leachate.Resting the peat for 1 month did significantly increase removal capacity.Desorption of some contaminants occurred when water was percolated through the peat. The desorption test effluent was not toxic to fish although iron, lead and COD (chemical oxygen demand) exceeded acceptable values.Chemical pretreatment using lime and ferric chloride achieved significant iron, manganese and calcium removals. Chemical pretreatment followed by peat adsorption offered no advantage other than reducing toxicity to fish.Peat treatment alone was effective in reducing concentrations to a level that was non-toxic to fish.

scholarly journals Impact of phosphate adsorption on the mobility of PANI‐supported nano zero‐valent iron

2021 ◽  
Author(s):  
Dantong Lin ◽  
Scott Bradford ◽  
Liming Hu ◽  
Irene M. C. Lo
Keyword(s):  
Zero Valent Iron ◽  
Phosphate Adsorption ◽  
Nano Zero Valent Iron
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