scholarly journals INHANCEMENT OF SOME CITRUS TREES TOLERANCE TO GASEOUS POLLUTANTS AND HEAVY METALS BY USING DIFFERENT ANTIOXIDANTS AND EFFECTIVE MICROORGANISMS

2015 ◽  
Vol 6 (1) ◽  
pp. 109-121
Author(s):  
E. EL-Baz ◽  
M. Mostafa ◽  
L. Arafat ◽  
M. Aboryia
Keyword(s):  
Heavy Metals ◽  
Gaseous Pollutants ◽  
Effective Microorganisms ◽  
Citrus Trees

The Study of Combustion of Municipal Waste in a Fluidised Bed Combustor

2003 ◽  
Author(s):  
I. Gulyurtlu ◽  
T. Crujeira ◽  
P. Abelha ◽  
D. Boavida ◽  
J. Seabra ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Combustion Efficiency ◽  
Solid Particles ◽  
Gaseous Pollutants ◽  
Fluidised Bed ◽  
Combustion Gases ◽  
Air Supply ◽  
Control Devices ◽  
Emission Limits ◽  
Bed Material

The combustion behaviour of municipal solid waste was studied in a pilot fluidised bed combustor. The waste was pelletised prior to its use. Both co-firing with coal and combustion of waste alone were under taken. The combustion studies were carried out on the pilot installation of INETI. The fluidised bed combustor is square in cross section with each side being 300 mm long. Its height is 5000 mm. There is a second air supply to the freeboard at different heights to deal with high volatile fuels. There was a continuous monitoring of the temperatures in the bed, as well as the composition of the combustion gases. The combustion gases leaving the reactor were let go through the recycling cyclone first to capture most of particulates elutriated out of the combustor. There was a second cyclone which was employed with the aim of increasing the overall efficiency of collecting solid particles. The gaseous pollutants leaving the stack were sampled under iso-kinetic conditions for particulate matter, chlorine compounds and heavy metals. The ash streams were characterised for heavy metals. The results obtained were compared with national legislation. The results obtained suggest that i) the combustion efficiency was very high, ii) there was an enrichment of ashes with heavy metals in the cyclones compared to the bed material, iii) in general, the gaseous pollutants were below the permited limits, and iv) for the compliance with the new European Directive for stricter emission limits adequate control devices, like bag filters, should be integrated with RDF combustion.

scholarly journals Simulating the dispersion of poisonous organic chemical compounds in wastewater treatment process through the active sludge method using the TOXChem model

2021 ◽  
Vol 5 (1) ◽  
pp. 025-031
Author(s):  
Masoomi Seyyed Roohollah ◽  
Azizi Mostafa ◽  
Aghlmand Reza ◽  
Gheibi Mohammad ◽  
Kian Zahra
Keyword(s):  
Heavy Metals ◽  
Wastewater Treatment ◽  
Chemical Structure ◽  
Treatment Process ◽  
Treatment Plant ◽  
Chemical Compounds ◽  
Organic Chemical ◽  
Gaseous Pollutants ◽  
Active Sludge ◽  
Wastewater Treatment Process

Naturally, microorganisms decompose the organic material existing in nature, both in the presence or absence of oxygen. The majority of materials such as poisonous chemical compounds, heavy metals, would prevent the treatment process from taking place, lead to the entry of these contaminants into the environment results in the emergence of numerous diseases. In the present study, using the TOXChem4.1 simulation model, attempts were made to simulate a wastewater treatment plant and then assess the dispersions of contaminants including 1,2-Dimethylnaphthalene, 1,3-Dinitropyrene, 1,6-Dimethylnaphthalene, 1,6-Dinitropyrene, and 17a-ethinylestradiol (EE2) in concentrations of a common scenario. The results of computer simulations showed that the EE2 contaminant is of the highest percentage of decomposition among others, due to its wider chemical structure. Consequently, it is clear that such contaminant is of the highest mass in the sludge exiting the treatment plant. In addition, the results of the simulations demonstrated that the highest volumes of gaseous pollutants take place in the modulation and initial sedimentation units.

scholarly journals Changes in the pollution of Lodz voivodship rainwater as a result of changes in pollutant immissions

2019 ◽  
pp. 31-37 ◽  
Author(s):  
Justyna Czerwińska ◽  
Grzegorz Wielgosiński
Keyword(s):  
Heavy Metals ◽  
Air Quality ◽  
Surface Water ◽  
Plant Protection ◽  
Atmospheric Precipitation ◽  
Plant Protection Products ◽  
Pollutant Emissions ◽  
Gaseous Pollutants ◽  
Atmospheric Air ◽  
Sanitary Condition

Increasing urbanization rates, particularly in cities, cause an increase in pollutant emissions into the environment. Immission of pollutants is the amount of particulate or gaseous pollutants that is received by the environment. Natural precipitation, i.e. rainwater, is polluted during the contact with air. As a result of atmospheric precipitation groundwater and soil become polluted. The pollutants also penetrate surface water, causing further contamination. In rainwater that goes to the sewage system, there are pollutants such as hydrocarbons, heavy metals, slurries, plant protection products and many more. This is largely dependent on the type of management of the catchment, its sanitary condition, and the time and intensity of precipitation. Another important factor is the composition of pollutants emitted into the atmospheric air in each area. The work shows changes in the pollution of rainwater in Lodz Voivodship in the years 2010-2016 and presents analysis of the data collected by the Regional Inspectorate for Environmental Protection. The analysis shows that the state of rainwater is steadily deteriorating which is directly related to air quality.

Damage to DNA of effective microorganisms by heavy metals: Impact on wastewater treatment

2008 ◽  
Vol 20 (12) ◽  
pp. 1514-1518 ◽  
Author(s):  
Sheng ZHOU ◽  
Chaohai WEI ◽  
Chaodeng LIAO ◽  
Haizhen WU
Keyword(s):  
Heavy Metals ◽  
Wastewater Treatment ◽  
Effective Microorganisms

Prediction of gaseous pollutants and heavy metals during fluidized bed incineration of dye sludge

2001 ◽  
Vol 18 (4) ◽  
pp. 506-511 ◽  
Author(s):  
Jeong-Gook Jang ◽  
Woo-Hyun Kim ◽  
Mi-Ran Kim ◽  
Hai-Soo Chun ◽  
Jea-Keun Lee
Keyword(s):  
Heavy Metals ◽  
Fluidized Bed ◽  
Gaseous Pollutants ◽  
Fluidized Bed Incineration

Sampling and analysis of the air-water interface with SEM and EDS of microlayers

1989 ◽  
Vol 47 ◽  
pp. 1004-1005
Author(s):  
Randall W. Smith ◽  
John Dash
Keyword(s):  
Heavy Metals ◽  
Surface Microlayer ◽  
Surface Films ◽  
Water Interface ◽  
Physical Processes ◽  
Infrared Spectroscopic Analysis ◽  
Eds Analysis ◽  
Air Water Interface ◽  
Significant Area ◽  
Bulk Chemical

The structure of the air-water interface forms a boundary layer that involves biological ,chemical geological and physical processes in its formation. Freshwater and sea surface microlayers form at the air-water interface and include a diverse assemblage of organic matter, detritus, microorganisms, plankton and heavy metals. The sampling of microlayers and the examination of components is presently a significant area of study because of the input of anthropogenic materials and their accumulation at the air-water interface. The neustonic organisms present in this environment may be sensitive to the toxic components of these inputs. Hardy reports that over 20 different methods have been developed for sampling of microlayers, primarily for bulk chemical analysis. We report here the examination of microlayer films for the documentation of structure and composition.Baier and Gucinski reported the use of Langmuir-Blogett films obtained on germanium prisms for infrared spectroscopic analysis (IR-ATR) of components. The sampling of microlayers has been done by collecting fi1ms on glass plates and teflon drums, We found that microlayers could be collected on 11 mm glass cover slips by pulling a Langmuir-Blogett film from a surface microlayer. Comparative collections were made on methylcel1ulose filter pads. The films could be air-dried or preserved in Lugol's Iodine Several slicks or surface films were sampled in September, 1987 in Chesapeake Bay, Maryland and in August, 1988 in Sequim Bay, Washington, For glass coverslips the films were air-dried, mounted on SEM pegs, ringed with colloidal silver, and sputter coated with Au-Pd, The Langmuir-Blogett film technique maintained the structure of the microlayer intact for examination, SEM observation and EDS analysis were then used to determine organisms and relative concentrations of heavy metals, using a Link AN 10000 EDS system with an ISI SS40 SEM unit. Typical heavy microlayer films are shown in Figure 3.

Nicotianamine: mediator of transport of iron and heavy metals in the phloem?

1993 ◽  
Vol 88 (3) ◽  
pp. 522-529 ◽  
Author(s):  
Udo W. Stephan ◽  
Gunter Scholz
Keyword(s):  
Heavy Metals
Sign in / Sign up

Export Citation Format

Share Document