EFFICIENCY OF CLEANING OF CHROME-CONTAINING WASTE WATER IN GALVANIC PRODUCTION

2020 ◽  
pp. 144-151
Author(s):  
L.N. Olshanskaya ◽  
I.A. Tiltigin ◽  
T.V. Osipova
Keyword(s):  
Waste Water ◽  
Comparative Analysis ◽  
Ion Exchange ◽  
Industrial Effluents ◽  
Promising Method ◽  
Combined Method ◽  
Galvanic Production

A promising method for purification of chromium-containing wastewater from galvanic plants is considered. A review and comparative analysis of existing methods and technologies for purifying industrial effluents from organochromic compounds: reagent, biological, ion-exchange, etc. are presented. The advantages of using the combined method of purification of chromium-containing wastewater based on electroflotation with preliminary electrocoagulation are shown. The effectiveness of the proposed combined method was evaluated and the scheme of the electroflotocoagulator was developed.

scholarly journals Environmental Pollution Around Dhaka EPZ and its Impact on Surface and Groundwater

1970 ◽  
Vol 46 (2) ◽  
pp. 153-162 ◽  
Author(s):  
MKA Khan ◽  
M Alam ◽  
MS Islam ◽  
MQ Hassan ◽  
MA Al-Mansur
Keyword(s):  
Waste Water ◽  
Water Samples ◽  
Industrial Effluent ◽  
Industrial Effluents ◽  
Industrial Sector ◽  
Background Concentration ◽  
Physical Parameters ◽  
Clay Layer ◽  
Surrounding Area ◽  
Surface And Groundwater

Industrial sector is gradually playing a more important role in Bangladesh economy and EPZs have provided a good platform of industrial establishment. Dhaka EPZ since its establishment has altered the fragile environment of the surrounding area. Huge amount of effluents discharged from Dhaka EPZ has been polluting the surface and groundwater. Surface water contamination by industrial effluents released from Dhaka Export Processing Zone (DEPZ) and the ramification to groundwater have been estimated. The study involves analyzing physicochemical properties along with major Anionic contaminants in waste water samples. Conversely their potential transmission into groundwater has been evaluated by analyzing HTW water samples from the surrounding area. Some important physical parameters were measured while collecting the sample in field condition. The suite of 6 major anions (F-, Cl-, NO2-, NO3-, SO4-2 and HCO3-) have been measured in ppm level of concentration by analyzing with chemically suppressed Ion Chromatograph while HCO3- content was determined by Titration method. Analysis reveals pH maximum 9.55, DO maximum 2.40 mg/L, TDS maximum 1280 mg/L, Bi-carbonate maximum 891 mg/L, Sulfate maximum 452 mg/L, Chloride maximum 179 mg/L, Nitrate maximum 44 mg/L and Fluoride not above detection limit. Higher concentration of Cl-, SO4-2, NO3- in waste water samples compared to the standard by DOE (Department of Environment) as well as background concentration from uncontaminated water can be correlated with industrial effluent discharge. On the other hand low level of concentration found in groundwater samples indicates that groundwater is still safe. This phenomenon is explained by the presence of impervious clay layer. Key words: Dhaka EPZ; Effluent; Madhupur Tract; Contaminants; DOE; Environment; Clay layer DOI: http://dx.doi.org/10.3329/bjsir.v46i2.8181 Bangladesh J. Sci. Ind. Res. 46(2), 153-162, 2011

Comparative Analysis of Forest Height Retrieval Methods by Polarimetric SAR Interferometry

2013 ◽  
Vol 726-731 ◽  
pp. 4686-4689
Author(s):  
Zhu Bo Zhou ◽  
Hong Zhang Ma ◽  
Xiao Bo Zhu ◽  
Lin Sun
Keyword(s):  
Comparative Analysis ◽  
Difference Method ◽  
Sar Interferometry ◽  
Combined Method ◽  
Polarimetric Sar ◽  
Forest Height ◽  
L Band ◽  
Polarimetric Sar Interferometry ◽  
Combined Methods

The objective of this paper is to compare and analyze the forest height retrieval methods from Polarimetric SAR Interferometry(POLINSAR).Both of the methods based on DEM difference and that on interferometry coherence amplitude are generalized, analyzed, and compared.Also in this paper combined methods of DEM difference and interferometry coherence amplitude are proposed and validated.The ESA fullpolarimetric interferometry L-band data are used for forest height analysis.The results show that the height is severely underestimated using DEM difference method,In constast,interferometry coherence amplitude method has a overest imation of height.The combined method of DEM difference and interferometry coherence amplitude has a much better estimate,closer to the true height than these two methods.

Synthesis of ion-exchange membranes for electrodialytic treatment of industrial effluents

Desalination ◽  
1983 ◽  
Vol 46 (1-3) ◽  
pp. 353-360 ◽  
Author(s):  
B. Chakravorty ◽  
R.N. Mukherjee ◽  
S. Basu
Keyword(s):  
Ion Exchange ◽  
Industrial Effluents ◽  
Ion Exchange Membranes
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