An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.
An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.
Tannery effluents are one of the major sources of environmental pollution with various toxic parameters and the effluent generated during liming and pickling operations of leather processing are even more dangerous due to their high and low pH range, respectively. In the present work, liming and pickling streams generated during the production of chrome tanned cow hide shoe upper was treated at different ratios and optimized the pH range 6.5 - 7.5. The effluents were mixed at different ratios without adding any foreign chemicals and obtained the results 88% reduction of COD, 94% reduction of BOD and 97% removal of total solids. DOI: http://dx.doi.org/10.3329/jbas.v38i2.21348 Journal of Bangladesh Academy of Sciences, Vol. 38, No. 2, 235-239, 2014
Abstract In the leather industry, 8–12% of chromium compound is used in tanning and around 60–70% of the applied chromium is consumed by the leather fibre and the rest of them are discharged to the effluent. This chromium has an adverse impact on the environment as well as on humans. Chromium (III) can be oxidized into chromium (VI) in many ways which are considered carcinogenic as well as mutagenic. Activated carbon generated from liming pelt trimming which is left over as a tannery solid waste with vegetable tannin (mimosa) was employed to investigate chromium (VI) adsorption from aqueous solutions. Activated carbon was prepared in a muffle furnace at 600oC in the presence of sulfuric acid. Batch tests were performed to determine how several factors, such as pH, contact time, adsorbent dosage, initial chromium content, and temperature affected the adsorption process. The excellent maximum chromium (VI) removal efficiency was found 99.15% from aqueous solutions at pH 1 and an adsorbent dosage of 15 g/L. According to the kinetic investigation, the chromium (VI) removal by the activated carbon followed a pseudo-second-order kinetic with an R2 of 0.9889. Thermodynamic parameters including ΔGo, ΔHo, and ΔSo revealed that the adsorption of chromium ions on the activated carbon was exothermic and spontaneous. The results prove that chromium (VI) could be removed from industrial wastewater using a very promising, cost-efficient biosorbent made from tannery solid waste. The novelty of the current approach is to utilize the tannery solid waste as an adsorbent to reduce the dangerous chemicals from the wastewater where pollutants will be eliminated by the treatment of waste.
An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.
An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.
An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.
An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.
Abstract. Southern region of Bangladesh is characterized by unfavorable ecosystem such as heavy rain, storm, salinity, water scarcity in dry season. Agricultural machinery especially conservation machinery is less practiced in this region. Mungbean and jute were planted at farmers‘ fields of Barishal and Khulna districts, respectively. The zero till planter (ZT), strip till planter (ST), bed planter (BP) and power tiller operated seeder (PTOS) along with conventional tilling were used for planting of mungbean and ST, PTOS along with conventional tillage cum broadcasting and conventional tillage cum jute seedling transplanting method were used for planting of jute. The effective field capacities of ZT, ST, BP, PTOS and power tiller for mungbean planting were 0.097, 0.104, 0.082, 0.111, and 0.081 ha h-1. The effective field capacities of ST, PTOS and power tiller for jute planting in dryland and wetland tillage were found 0.098, 0.099, 0.100 and 0.096 ha h-1.Fuel saving by ZT, ST, BP, and PTOS was about 60% to 75% than that of power tiller. Significantly the highest grain yields of mungbean were found from zero till and strip till planted methods than those of other methods. Dry stalk and fiber yields were found from PTOS planted jute followed by strip till and conventional tillage cum broadcasting jutes. The highest benefit cost ratio (BCR) for planting of mungbean was obtained from ST (2.60) and ZT (2.40) followed by other methods. For planting of jute the highest BCR was obtained from PTOS (2.54) and ST (2.31) methods.Therefore, ZT and the ST may be recommended in Barishal region for planting of mungbean and PTOS and the ST in Khulna region for planting of jute.
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