Tannery effluent Chemical parameters Chromium Water hyacinthThe present study was conducted to explore the efficiency of water hyacinth (Eichhornia crassipes) to cleanup of tannery effluent in terms of pH, TDS, EC, BOD and most importantly Cr. The study period was from November, 2013 to April, 2014. After 7 days of treatment by water hyacinth, the removal rates were: 68.15% for BOD, 59.82% for TDS and 46.56% for EC, where the corresponding rates after 15 days were: 81.73% for BOD, 67.15% for TDS and 61.93% for EC. After treatment with water hyacinth, pH of effluent reached to nearly neutral level from alkaline condition. In this study, major focus was on Cr removal and the treatment of tannery effluent using water hyacinth resulted in 32.42% reduction of Cr after 7 days and 54.72% after 15 days. The present results revealed that water hyacinth had the strong capability of absorbing Cr. On the other hand, the reduction rates after 15 days for sedimentation were: 54.23% for BOD, 30.21% for TDS, 22.28% for EC and 14.37% for Cr. After comparing the two treatment processes, it was found that the reduction rate by phytoremediation process was much higher than that of sedimentation process. This result reflected the high efficiency of water hyacinth to reduce pollutant especially Cr from tannery effluent as eco-friendly sustainable technology.
This study was carried out to investigate the mode of fertilizer and pesticide use and their impact on soil fertility and surrounding environment. It is revealed that paddy is the mostly produced crop in this area and fertilizers and pesticides were intensively used for boosting up the production of crops. Among all the fertilizers Urea is the mostly used fertilizer followed by Urea , MP, DAP/TSP and also organic fertilizer (although in less amount). Among the pesticides used in study area to kill pest, Furadan and Diazinon were most demanded. Farmers of this area used either greater amount or less amount of fertilizer than the standard amount provided by government. Most of the farmers and agrochemical dealers were not aware about the impact of fertilizer and pesticide on crop production and environment as well. This outcome draws base line situation which can be useful towards further relevant research as well as to develop policy in agrochemicals use in agriculture.
The present study was conducted to investigate existing culture conditions of pangus (Pangasius hypophthalmus) at farms in Trishal Upazila under Mymensingh district during January to June, 2016. Data were collected with questionnaire by personal interviewing of the respondents. The study result showed that- the farmers of large category are about 60% where 47% farmers have leased pond. Most of the farmer use deep tube-well water as source, 87% farmers practice monoculture of pangus and monitored the health of fish in a regular basis. Only 13% farmer reported diseases occurred in their pond. Most of the pangus farmers used homemade or local farm made supplementary feeds for pangus culture. The study showed that development of better farming system, improving water management, stocking of quality fingerlings, health monitoring and use of prime and standard quality feed has resulted better pangus production in Trishal area.
J. Environ. Sci. & Natural Resources, 11(1-2): 97-107 2018
The present study was conducted to carry out a comparative study on farm materials (water, soil, feed) and the quality parameters of pangus (Pangasianodon hypophthalamus) of five different farms in Trishal area under Mymensingh district. The study was carried out during May-June, 2016. Most of the pangus farmers used homemade or farm made supplementary feeds for pangus culture The percent moisture, protein, lipid and ash content in fresh fish ranged from 77.05 to 78.79, 14.21 to14.84, 3.55 to 4.49 and 2.03 to 2.67 whereas after 24 hrs of death of fishes, these percent values changed as 77.05 to 78.79, 14.21 to14.84, 3.55 to 4.49 and 2.03 to 2.67. Slight changes observed in different quality parameters in the fish samples 24 hrs after death as dead fishes were preserved at chilling temperature in a homestead refrigerator till analysis. Therefore, the study could be concluded that- though the values for different parameters of farm materials (water, soil, feed) and quality parameters of fish samples differed but was mostly not significant. The differences observed in the parameters might be due to the variations in management techniques of each farm.
J. Environ. Sci. & Natural Resources, 11(1-2): 109-119 2018
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