An Investigation on the Pattern of Land Use Change in Dhaka City Using Remote Sensing and GIS Application

This study assessed the extent and trend of landuse/cover change in three selected area of Dhaka city, Bangladesh. This paper examined the use of GIS and Remote Sensing in mapping Land Use/Land Cover in Dhaka city of Landsat imageries of 1960, 2000 and 2014 were downloaded from the Landsat website and to detect the changes that has taken place in this status between these periods. Remote sensing and GIS based software (ILWIS) were used to produce and analysis the land use maps and least square method was functioned to identify the trend of land use change in the study areas. The images were analyzed using unsupervised classification approach in ILWIS 4.1 environment. The present study expressed the experiences of unplanned land use change in Dhaka city. And it is found that the study area follows the pattern of urbanization without planned development. Consequently, the pattern of unplanned land use change in Dhaka city will make it a haphazard city in World.DOI: http://dx.doi.org/10.3329/jesnr.v7i2.22217 J. Environ. Sci. &amp; Natural Resources, 7(2): 105-109 2014</jats:p

Hospital Waste Generation and Management in Mymensingh Municipality

The study was conducted on hospital waste generation in Mymensingh municipality and also its management technique. Data was collected through questionnaire interview from local residents, superintendents, nurses, observation and secondary sources. The results revealed that wastes are collected every alternative day and though sometime in irregular basis. Hospital wastes causes different health hazards like bad smell, infestation of animals, diarrhoea, skin diseases etc. due to irregular collection, unsafe handling, disposal, storage, transportation and finally dumped with municipal wastes. Shortage of dustbin is common in every hospitals and clinics in Mymensingh municipality. The study also revealed that 1500-2000 kg wastes were generated per day in Mymensingh municipality area in which 25% infectious and 75% non- infectious. These huge amount of wastes could be treated or disposed by the process like incineration, deep-burial, local autoclaving, micro waving, disinfections destruction &amp; drugs disposal in secured landfills, chemical treatment etc.J. Environ. Sci. &amp; Natural Resources, 8(1): 135-138 2015</jats:p

Textural Influence on Surface and Subsurface Soil Temperatures under Various Conditions

An experiment was conducted at the field laboratory of Department of Environmental Science, Bangladesh Agricultural University, Mymensingh to study the textural influence on surface and subsurface soil temperatures under various conditions. The experiment consisted of four types of soil (red, sandy, clay and peat). Observations were made at three conditions viz. bare, moist and vegetation cover. Sandy soil at bare condition showed the highest surface temperature followed by peat, red and clay soils. Sand surface produced nearly 10ºC higher values than from clay soil at around midday hours. In four types of soils, the amplitude of the daily surface temperature wave decreased in the order sand &gt; peat &gt; red &gt; clay at bare dry condition. In case of subsurface temperature observed at 10 cm depth, red, clay and peat soils showed insignificant differences. Soil surface temperatures of 4 types soils under moisture condition at around mid days showed similar pattern as in dry condition i.e. sand &gt; peat &gt; red &gt; clay. Soil subsurface temperatures of 4 types soils under moisture condition at around mid days showed similar pattern as in surface temperature. Among three conditions, sandy soil emitted highest long wave radiation (-649.88 Wm-2) at bare condition. The long wave radiation emitted by the surface was lower when the soil was wet and has vegetation cover. Air temperature positively correlated with soil temperature.J. Environ. Sci. &amp; Natural Resources, 8(2): 147-151 2015</jats:p

Assessment of Physico-chemical Characteristics of Textile Effluent at Different Stages of Treatment Process

The study was conducted to observe effluent management technique, physico-chemical characteristic (BOD, TDS, DO, pH, EC, temperature, color, odor, transparency and heavy metals) at different steps of effluent treatment process and compare those with standards of Bangladesh Environmental Conservation Rules (ECR)-1997. Nine effluent samples were collected from Impress Newtex Composite Textile Ltd Industries at Gorai under Mirzapur Upazila during the month of January to June 2013. The color and odor of the inlet effluent samples were highly colored and emit foul smell, respectively but in case of outlet effluent samples very low. The DO, BOD, TDS, EC, pH, temperature, transparency value of all collected samples from ETP outlet were 5 mg/l, 42 mg/l, 2245 mg/l, 192 ?s/cm, 6.5, 31.2 cm, respectively which fulfils ECR (1997) standards for inland surface water, public sewerage water and land for irrigation excepts the value of TDS. In case of heavy metal (Pb, Zn &amp;Ni) assessment the concentrations of all collected samples were within the permissible limit according to ECR, 1997 accepts Pb for inland surface water and land for irrigation. Different types of dyes and chemicals were used during fabrics dyeing. As a result, the values of different physico-chemical parameters were more in inlet effluent but due to treatment its shows less value at the outlet effluent which fulfils ECR (1997) standards requirement. Only best management practices can ensure the best effluent quality discharged into the environment as well as best performance of ETP.DOI: http://dx.doi.org/10.3329/jesnr.v7i2.22204 J. Environ. Sci. &amp; Natural Resources, 7(2): 53-58 2014</jats:p