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Journal of Water Resource and Protection 2009年第3期1卷 210-215页

作者： Raquibul ALAM md. delwar hossain 不详

Air-stripping method was used to remove ammonia from the wastewater collected from natural gas fertilizer factory. Different materials were used as packing materials for the air stripping system. The effect of pH over 10.5, air-water flow ratio, nature of packing materials, height of materials and initial influent concentration of ammonia on air stripping unit were investigated. An attempt has been made to find out the stripping con-stant. Stripping constant was found to be .001, 0014, .001 and .0009 for coal, plastic ring, stone chips and wood chips, respectively. Best result was found for plastic ring for its higher surface area. Wood chips did not give good result, because the chips amalgamate with each other and hence reduces the surface area.

关键词： Ammonia Air Stripping Packing Materials Stripping Constant

Contamination and Ecological Risk Assessment of Heavy Metal in the Sediment of Turag River, Bangladesh: An Index Analysis Approach

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Journal of Water Resource and Protection 2013年第2期5卷 239-248页

作者： Zoynab Banu md. Shariful Alam Chowdhury md. delwar hossain Ken’ichi Nakagami Department of Environmental Engineering Faculty of Civil Engineering Bangladesh University of Engineering and Technology (BUET) Dhaka Bangladesh DMC of Dhaka Water Supply Sector Development Project (DWSSDP) Dhaka Water Supply and Sewerage Authority (DWASA) & World Bank Scholar Graduate School of Policy Science Ritsumeikan University Kyoto Japan Gas Transmission Company Ltd. (GTCL) Under the Ministry of Power Energy and Mineral Resources Government of Bangladesh Bangladesh Graduate School of Policy Science Ritsumeikan Center for Sustainability Science Ritsumeikan University Kyoto Japan

Encroachment, disposal of untreated domestic and industrial wastewater and dumping of solid wastes have degraded the overall quality of the river Turag, which is located in Dhaka—the Capital City of Bangladesh. The present study investigated the extent of pollution of sediments of this river and analyzed the regional variability for the concentrations of Cr, Pb, Zn, Cu and Cd—all of concern because of their potential toxicity, using atomic absorption spectrophotometer. As per US EPA sediment quality guideline, metal concentrations ranged between Cd: 0.00 - 0.80, Cr: 32.00 - 75.50, Cu: 46.30 - 60.00, Pb: 28.30 - 36.40, and Zn: 94.60 - 190.10 mg/kg in the Turag river sediments. Cr, Cu, Zn belongs to moderately to highly polluted, Pb and Cd belongs to not polluted for Turag river. The heavy metals contamination in the sediments were also evaluated by applying Index of geo-accumulation (Igeo), contamination factor (Cf), pollution load index (PLI) etc. Toxicity characteristics leaching procedure (TCLP) test (US EPA 1311) for sediment samples have been performed also for metals (Pb, Cd, Cr, Cu and Zn) to determine the readily toxicity level of heavy metals. Sieve analysis of sediment performed in this study to determine the physical characteristic of sediment samples. The metal concentrations are well below the regulated level as per US EPA. This index can be complemented with the contamination index, which allows more site-specific and accurate information on contaminant levels. If the aim of work on contamination evaluation is to assess the overall contamination of a study area, the indices are highly appropriate.

关键词： Heavy Metal TCLP Test Sediment Geo-Accumulation Index Ecological Risk Index Contamination Factor Turag River etc.

Evaluation of Economical and Ecological Aspects of Denim Garments Dyeing with Fluorescent Dye

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Journal of Materials Science and Chemical Engineering 2013年第7期1卷 1-6页

作者： Muhammad Abdur Rashid md. delwar hossain Muhammad Mufidul Islam md. Nakib-Ul-Hasan Department of Textile Engineering Dhaka University of Engineering & Technology (DUET) Gazipur Bangladesh Department of Textile Engineering Northern University Bangladesh Dhaka Bangladesh

In this study the existing process (3 steps) and proposed process (2 steps) were evaluated during dyeing of denim fabric with fluorescent dye. It compared the effectiveness of these two processes of fluorescent dyeing in the textile industry. Here at first the grey denim fabric was pretreated by scouring and bleaching. Then the fabric was dyed in existing process i.e. through catanizing, dyeing and binding at 10% and 15% shades. Again the pretreated fabric was dyed in proposed process i.e. through catanizing and (dyeing and binding) with same shades. Then the properties of two types of dyed fabric were compared. This study provides a set of experimental results, discussion and comparison between the two processes. The results show that the proposed process has less power and time consumption and more water savings compared to existing process. So the evaluation reflected that the proposed process was much more effective than existing process of denim dyeing with fluorescent dye.

关键词： Fluorescent Dyestuff Denim Fabric Fastness Properties

Frequency of Malignancy in Solitary Thyroid Nodule in a Tertiary Level Hospital of Bangladesh

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International Journal of Otolaryngology and Head & Neck Surgery 2019年第4期8卷 132-138页

作者： md.Shazibur Rashid Najnin Akhter md.Shafiqur Rahman Jahangir Alam Majumd.r A. H. M. delwar md.Golam Mustafa Otolaryngology Comilla Medical College Cumilla Bangladesh Pediatrics Comilla Medical College Cumilla Bangladesh

Objectives: To determine the frequency of thyroid malignancy in clinically and sonographically solitary thyroid nodule in patients undergoing thyroidectomy in Comilla Medical College Hospital. Methods: A cross sectional study was carried out at the Department of Otolaryngology and Head Neck Surgery of Comilla Medical College Hospital during the period from January 2016 to January 2019. This study includes all patients admitted and undergoing surgery with solitary thyroid nodule. Results: Out of 188 patients 146 patients were female and 42 patients were male with female:male ratio of 3.4:1. Out of 188 patients 24 patients were found histologically thyroid malignancy. Among them 14 patients were male and 10 patients were female. Papillary carcinoma was found in all cases. Conclusions: Follicular carcinoma is rare in our country. Histopathological examiners may not efficiently be doing their job to differentiate carcinoma from adenoma.

关键词： Solitary Thyroid Nodule Papillary Carcinoma Follicular Carcinoma