Assessment of heavy metals (total chromium, lead, and manganese) contamination of residential soil and homegrown vegetables near a former chemical manufacturing facility in Tarnaveni, Romania

Chromium-like heavy toxic metals seriously influence the metabolism of living organisms and cause permanent threatening of health. Microorganisms can help to detoxify those hazardous heavy metals in the environment by the process of bioremediation. Two bacterial genera were isolated from industrial sludge designated P1 and P2. From the 16srRNA study, it is revealed that P1 is Bacillus cereus and P2 is Enterobacter sp. They are deposited in NCMR and NCBI and received the accession no. MCC 3868 for P1 and MCC 3788 for P2. P1 is gram positive, motile, and P2 is gram negative, motile. Eighteen antibiotics have been taken for antibiotic assay; P1 is resistant to 12; P2 is resistant to 8 antibiotics. For growth pattern analysis in chromium, three parameters have been selected, and they are temperature, pH, and biomass. In LD50 and above parameters, total chromium uptake by those bacteria in stressed conditions have been recorded. The two bacteria are not antagonistic to each other so they are used to bioremediate chromium from their contaminated sites and also treated as consortium.

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Carduus nutans L and the Effect on the Heavy Metals and Microenvironment Biota

Revista de Chimie ◽

10.37358/rc.17.7.5708 ◽

2017 ◽

Vol 68 (7) ◽

pp. 1524-1527

Author(s):

Luminita Cojocariu ◽

Despina Maria Bordean ◽

Aurica Breica Borozan ◽

Simona Nita ◽

Adina Horablaga

Keyword(s):

Heavy Metals ◽

Zinc Concentration ◽

Rhizosphere Soil ◽

Atomic Absorption Spectrophotometry ◽

Soil Samples ◽

Total Chromium ◽

Carduus Nutans ◽

Flame Atomic Absorption ◽

Number Of Bacteria ◽

Iron And Manganese

The aim of the study was to identify the effect of Carduus nutans L on the heavy metals and microenvironment biota. Ten plants of Carduus nutans L were collected togheter with the rhizosphere soil and as reference the soil was collectued from an abandonated pasture where no vegetation was growing. The metal concentrations in the filtrate were determined by flame atomic absorption spectrophotometry and the total number of bacteria and actinomycetes from the average soil samples was established. Based on the mathematical models we managed to identify the effects of the heavy metals present in the Carduus nutans L rhizosphere soil samples on the development and presence of bacteria and actinomycetes colonies. We can state that iron and manganese influence the CFU of bacteria and actinomycetes and these in their turn have an impact on the zinc concentration in soil which will influence total chromium content and copper concentrations.

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Removal of Iron and Total Chromium Contaminations in Landfill Leachate by Using Electrocoagulation Process

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.660.279 ◽

2015 ◽

Vol 660 ◽

pp. 279-283 ◽

Cited By ~ 7

Author(s):

Mohd Khairul Nizam Mahmad ◽

M.A.Z. Mohd Remy Rozainy ◽

Ismail Abustan ◽

Norlia Baharun

Keyword(s):

Heavy Metals ◽

Electrolyte Solution ◽

Research Work ◽

Operation Time ◽

Final Concentration ◽

Steel Grade ◽

Total Chromium ◽

Initial Ph ◽

Electrocoagulation Process ◽

Main Factor

This research work involves the study removal of Iron and Total Chromium by electrocoagulation process. This project focused on leachate landfill from Pulau Burung, Nibong Tebal, Penang as an electrolyte solution. These heavy metals are the main factor contributing to pollution in leachate landfill. Types of electrodes used in this study were Aluminium (grade 5052) and Stainless Steel (grade 316). The ranges of initial pH applied were pH (3, 4, 5, 6 and 7) and voltages applied were 1.5V, 2.0V and 2.5V. These three parameters were evaluated and the operation time was 60 minutes. At the end of electrocoagulation process, the solutions were stored and analysed using AAS to determine the final concentration of electrolyte solution.

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Estimating fouling and hydraulic debottlenecking of a clarifier piping system in the expansion of a chemical manufacturing plant

Chemical Product and Process Modeling ◽

10.1515/cppm-2020-0029 ◽

2020 ◽

Vol 0 (0) ◽

Author(s):

Avinashkumar V. Karre ◽

Deepak Sharma ◽

Kalliat T. Valsaraj

Keyword(s):

Hydraulic System ◽

Gulf Coast ◽

Piping System ◽

Manufacturing Plant ◽

Hydraulic Systems ◽

Manufacturing Facility ◽

Pressure Losses ◽

Chemical Manufacturing ◽

Plant Data ◽

Liquid Movement

AbstractDebottlenecking and estimating fouling in a clarifier piping system for the expansion of an existing chemical manufacturing facility in the U.S. Gulf Coast was analyzed and modified. The existing clarifier piping system fitting data was gathered for the real-world operation from the field. This data was used in the Applied Flow Technology (AFT) Fathom, a program used to study hydraulic systems. The hydraulic results with and without recommended piping modifications along with changing piping roughness factors were also analyzed. The two piping roughness factor cases tested were roughness of 0.152 mm and fouling of 25.4 mm. The AFT Fathom results showed that without piping modifications and specifying fouling of 25.4 mm, required flow cannot be established due to insufficient driving force for liquid movement. The measured field flow data confirmed that the reduced clarifier capacity was due to high pressure losses in the hydraulic system. Also, it was found that the existing clarifier nozzle was inadequately designed originally, and replacing the nozzle showed an increase in the clarifier capacity due to reduced entrainment of the air. These modifications were further adapted in the plant expansion and operations were validated using the actual plant data. The plant data matched closely with the estimated capacities of the clarifiers. AFT Fathom hydraulic software was effective in predicting a fouling severity in the clarifier piping system and debottlenecking of the clarifier capacity was done. The conclusions derived from this study can be used all over the world where clarifiers are utilized.

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Impact of heavy metals on human toxicity using LCA: The case study of Walloon corn

Matériaux & Techniques ◽

10.1051/mattech/2019010 ◽

2019 ◽

Vol 107 (1) ◽

pp. 110 ◽

Cited By ~ 1

Author(s):

Saïcha Gerbinet ◽

Florence Van Stappen ◽

Sandra Belboom ◽

Eric Pezennec ◽

Angélique Léonard

Keyword(s):

Heavy Metals ◽

Large Contribution ◽

Human Toxicity ◽

Local Data ◽

Total Chromium ◽

Data Field ◽

Background Data ◽

The Impact ◽

Impact Of Pesticides

This paper focuses on potential errors when assessing the human toxicity of corn farming in Wallonia, Belgium. The USEtox method is applied to the farming of 1 hectare of corn. Local data are used for farming data and GaBi datasets for background data. Field emissions due to farming are calculated by the most prevailing models. The results in human toxicity, cancer effect, underline the large contribution of chromium (Cr) emissions. But when characterizing fertilizer composition, only the total chromium is measured and therefore unspecified chromium is used as emissions. However, it is known that chromium in the natural environment is mostly the non-toxic form Cr (III), which would greatly decrease the impact as the characterization factor for unspecified chromium is, in USEtox, the average of Cr (III) and the toxic form Cr (VI). The impact for human toxicity, non-cancer effect is mostly related to zinc emissions even if zinc is relatively harmless. The impact of pesticides is negligible in both cases. These results show that caution must be taken when examining/interpreting toxicity categories.

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HEAVY METALS IN POULTRY AND FISH FEED INGREDIENTS IN BANGLADESH: A POTENTIAL THREAT TO OUR NEXT GENERATION

International Journal of Engineering Applied Sciences and Technology ◽

10.33564/ijeast.2020.v05i08.009 ◽

2020 ◽

Vol 5 (8) ◽

Author(s):

Asia Akter ◽

Prof Dr. Md. Nadiruzzaman Mondol ◽

Prof Dr. Afrose Sultana Chamon ◽

Prof Dr. Syed Mohammad Abu Faiz

Keyword(s):

Heavy Metals ◽

Sampling Site ◽

Poultry Feed ◽

Fish Feed ◽

Sample Type ◽

Protein Concentrate ◽

Potential Threat ◽

Total Chromium ◽

Feed Ingredients ◽

Tannery Waste

Hazaribagh the area of leather processing industries; is the main place of Bangladesh from where the poultry and fish feed have produced and supplied all over the country. Solid tannery waste and sliced- cut pieces of skin and hide are proteineceous. These wastes are converted to protein - concentrate to be used in poultry feed, fish feed and bio fertilizer without any appropriate treatment. Although total Chromium content in tannery waste based poultry and fish feed has been determined previously but no studies appear to have been on others heavy metals i.e. Zn, Pb, Cd, Ni, Mn and Fe. AAS is used to determine the heavy metals concentration in ppm. A total three types of sample were collected from different location of sampling site. The sample represents the various stages of protein - concentrate production from solid waste to final products i.e. poultry and fish feed ingredients. All heavy metals were not only detected in all sample type but also significantly higher than the MAC value for poultry and fish feed ingredients and cross the permissible limit for human.

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