THE IMPACT OF RIVER BED SEDIMENTATION ON THE SUNDARBANS MANGROVE FOREST (BANGLADESH) WITH ITS EXCEPTIONAL ECOLOGICAL VALUE

The present contribution focuses on challenges for conservation efforts of the Sundarbans mangrove forest in Bangladesh, which is a World Heritage Site. Current threats to its ecology may affect the forest's diminishing population of Royal Bengal Tigers. Moreover, the vegetation and wildlife are under threat because of significantly increasing concentrations of salt in the water. The effect of dredging in the Passur River is insignificant in terms of the so-called Outstanding Universal Value of the forest because the measured Environmental Risk Index is relatively low. The toxicity level is to be 29%. The salinity levels of the Sundarbans vary from 54,025 dS/m to 69,152 dS/m for south western rivers, which is some 50% higher than the typical salinity value of 43,320 dS/m. This has a strongly negative effect on the soil, agriculture, fisheries, flora, and wildlife; all this is detrimental for the Outstanding Universal Value of the Sundarbans. Examination of the current physical, chemical, and biological processes that pay a role in the Sundarbans natural setup and ecosystem indicates that it is under significant environmental stress

An Investigation of the Effectiveness of Recycled Coconut Fiber and Rice Husk as Filter Media for Wastewater Treatment

The most vitally significant ingredient that all life on earth needs in order to survive is water. The global rate of wastewater discharge is rising quickly in tandem with population growth. As a result, wastewater treatment is a viable option to take into account for increased water demands. This investigation's primary objectives are to examine the contaminants found in wastewater and assess the efficiency of filtering collected wastewater using a mixture of coconut fibers, rice husks, sand, and stone chips. The untreated wastewater was gathered from KUET's six separate residence halls in Bangladesh. Inflow water and outflow water from filter media were used to measure a number of wastewater quality characteristics for the samples that were collected. Physical and chemical tests such as those for suspended particles, pH, turbidity, total coliform, and fecal coliform are among the factors examined in this study. Both coconut fiber and rice husk have been found to be useful as filter medium for the removal of contaminants present in wastewater. Because coconut fiber has a large number of micro pores with a standard surface area, it eliminates fungus and rice husk functions as an adsorbent for pollutants in wastewater