Amani Badawi*, Samar M. Al Sawy and Hamza M. Khalil
DOI: 10.37421/2380-2391.2021.8.339
Red Sea is considered as enclosed water bodies, where natural and human-induced stresses created intense impacts on marine ecosystem. Coastal surface sediments are widely utilized as indicator for pollution level. Recent sediments were collected from selected five sites along the Egyptian northern coast of the Red Sea, located between El Quseir and Marsa Alam areas. Concentration and distribution of eight heavy metals (Cu, Zn, Pb, Cd, Fe, Mn, Ni and Co), combined with some geochemical parameter and grain size analysis have been evaluated, to assess quality of benthic environment, the source and threats gradient on coastal marine environment. Three level of threats gradient have been distinguished, mainly originated from anthropogenic sources and ranged from relatively high in El Quseir Harbor, moderate in El Hamrawein and low in Marsa Abu Dabbab, Wadi El Quseir El-Kadium and Sharm EI-Bahari. Un-severe heavy metal pollution gradient are represented in the investigated sites.
DOI: 10.37421/2380-2391.2021.8.342
DOI: 10.37421/2380-2391.2021.8.341
DOI: 10.37421/2380-2391.2021.8.343
DOI: 10.37421/2380-2391.2021.8.344
DOI: 10.37421/2380-2391.2021.8.338
DOI: 10.37421/2380-2391.2021.8.336
DOI: 10.37421/2380-2391.2021.8.337
DOI: 10.37421/2380-2391.2021.8.335
James K. Mbugua*, Gabriel A. Waswa, Damaris M. Nduta and Joseph M. Mwaniki
DOI: 10.37421/2380-2391.2021.8.334
The trace amount of carbon dioxide and hydrogen sulphide in raw biogas lowers its calorific value, causes corrosion and makes it hard to compress the biogas into cylinders. Raw biogas was obtained from anaerobic digestion of cow dung and market wastes. The gas was stored in tubes or urine bags before upgrading process. Eburru natural zeolite rocks were used as the upgrade materials. The measured initial level of raw biogas was 0.0227% H2S, > 20% CO2 and 52-56% CH4. The total removal using zeolite was observed to be 75% CO2 and 95.34% H2S leading to 83.45 – 91.23% methane levels. The morphological structure of zeolitic rocks accounted for its higher upgrading properties. In addition, the porosity in these rocks meant that CO2 and H2S were adsorbed resulting in higher CH4 levels in the upgraded biogas.
Nabeela Firdous*, Irfan Ahmed Shaikh, Sana Islam and Fariha Arooj
DOI: 10.37421/2380-2391.2021.8.330
Dyeing wash-off operations in textile industries quite water intensive resulting into the generation of highly polluted wastewater. This study evaluated the treatment efficiency of electrocoagulation process to decolorize the synthetic effluent of CI Reactive Yellow 145 and then, the treated effluent was reused for 08 subsequent wash-off cycles of textile dyeing. The process parameters (Electrolysis time, applied current density and pH) were optimized and the maximum colour removal efficiency (98%) was achieved at pH 7, 10 minutes treatment time and current density of 90 A/m2. The fabric quality was assessed in terms of Colour difference and wash fastness properties. The Colour difference values of all dyed fabric samples up to 8 reuse cycles were ranged 0.38 to 0.85 which is industrially acceptable quality limit (ΔEcmc < 1). The wash fastness and Colour strength properties were also comparable to that of conventionally washed off fabric samples. However, an increase in pH, COD, TDS and turbidity was observed after every reuse but it did not deteriorate the quality of dyeing. This approach of reuse of electrocoagulation treated dye wash-off liquor up to 8 cycles provides a sustainable solution for textile industry.
DOI: 10.37421/2380-2391.2021.8.331
DOI: 10.37421/2380-2391.2021.8.334
DOI: 10.37421/2380-2391.2021.8.332
DOI: 10.37421/2380-2391.2021.8.333
Journal of Environmental Analytical Chemistry received 996 citations as per Google Scholar report
