Seasonality in physico-chemical parameters of tannery wastewater passing through the East Calcutta wetland ecosystem / B. Chattopadhyay in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 88, N° 1 (01-02/2004)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 88, N° 1 (01-02/2004) Titre : Seasonality in physico-chemical parameters of tannery wastewater passing through the East Calcutta wetland ecosystem Type de document : texte imprimé Auteurs : B. Chattopadhyay, Auteur ; S. Chatterjee, Auteur ; Subhra Kumar Mukhopadhyay, Auteur Année de publication : 2004 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Cuirs et peaux -- Industrie -- Aspect de l'environnement Cuirs et peaux -- Industrie -- Inde Eaux usées -- Analyse Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Areas under investigation are located within the East Calcutta wetlands, India, a declared Ramsar site (lat.22°33’ - 22°40’N; long. 88°25’ - 88°35’E). Peripheral regions of East Calcutta wetland areas harbour 538 tanneries and a large amount of composite tannery effluent and solid wastes from these tannery agglomerates are discharged without pre-treatment. In the present investigation physico-chemical parameters, like air and water temperatures, water velocity, pH, conductivity, TDS, TSS, DO, NO3 1-, PO4 3-, Cl1-, S2-, total hardness, alkalinity, acidity, BOD5 20 and COD of the composite wastewater were measured for two years to record changes along the gradient, seasonal events and the ameliorating capacities of the wetland ecosystem. The Dissolved Oxygen (DO) content of the wastewater increased gradually along the length of the canal from the source towards the river mouth. Water velocity at different study sites varied from 0.061 – 0.333 m s-1. Such quiescent flow led to lower concentrations of TSS at distant sites. There was a 10 fold increment of DO at Site-II, 44 fold at Site-III and 424 fold at Site-IV compared to Site-I. A considerable gain in phosphate concentration was recorded from Site-II onwards, when a large amount of domestic sewage was mixed with the composite effluent. Unlike phosphate, nitrate was present in considerable amounts in the tannery wastewater. Seasonal fluctuation of both CO3 hardness and total hardness showed comparable patterns there were two peaks, one each during spring and in post monsoon periods. Sulphide concentrations at different sites along the wastewater-carrying canal did not reduce greatly with distance from the source. At most sites a rise in the sulphide concentrations in summer and winter months and a dip during the post-monsoon period were evident. Significant amelioration of the tannery effluent was made by the wetland biota. Note de contenu : - MATERIALS AND METHODS : Sampling sites - Analysis of samples - RESULTS : Temperature - Dissolved Oxygen - Total Dissolved Solids and Conductivity - Total Suspended Solids - Phosphate - Nitrogen - Alkalinity - Chlorides - Sulphides - BOD - COD - - Table 1 : Seasonal fluctuations of physico-chemical parameters of wastewater at Site-I - Table 2 : Seasonal fluctuations of physico-chemical parameters of wastewater at Site-II - Table 3 : Seasonal fluctuations of physico-chemical parameters of wastewater at Site-III - Table 4 : Seasonal fluctuations of physico-chemical parameters of wastewater at Site IV - Table 5 : Mean and standard deviation values (N = 24each) of the physico-chemical parameters measured at the study sites (April 1998 - March 2000) - Table 6 : Factor score coefficient matrix of physico-chemical parameters (N = 24 each) at the study sites (Sites I –VI) and all the sites put together - Table 7 : Multiple regression based on factor analysis considering parameter of component 1 having R.F.L.=1.00 as dependent and other dominant parameters of component 1 as independent variables En ligne : https://drive.google.com/file/d/1DLir7oWklL7hCqLA8BRI4162a6zmnec_/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39653 [article]

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