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Zaheer Aslam Ibnelwaleed A. Hussein Mohammad Anwar Parvez Waqar Ahmad Ihsanullah 《Journal of the Air & Waste Management Association (1995)》2019,69(2):246-257
Waste oil fly ash (OFA) collected from disposal of power generation plants was treated by physicochemical activation technique to improve the surface properties of OFA. This synthesized material was further used for potential hydrogen sulfide (H2S) adsorption from synthetic natural gas. The raw OFA was basically modified with a mixture of acids (20% nitric acid [HNO3] and 80% phosphoric acid [H3PO4]), and it was further treated with 2 M potassium hydroxide (KOH) to enhance the surface affinity as well as surface area of synthesized activated carbon. Correspondingly, it enhanced the adsorption of H2S. Crystallinity, surface morphology, and pore volume distribution of prepared activated carbon were investigated using X-ray diffraction (XRD), scanning electron microscopy (SEM), and Brunauer-Emmett-Teller (BET) analyses. Fourier transform infrared (FTIR) study was also performed to identify the functional groups during different synthesis stages of modified activated carbon. The Langmuir, Freundlich, Sips, and dual-site Langmuir (DSL) models were used to study the kinetic and breakthrough behavior of H2S adsorption over alkali-modified activated carbon. Modeling results of isotherms indicated that OFA has dual sites with high and low affinity for H2S adsorption. The Clark model, Thomas model, and Yoon-Nelson model were used to examine the effects of flow rate and inlet concentration on the adsorption of H2S. Maximum uptake capacity of 8.5 mg/g was achieved at 100 ppm inlet concentration and flow rate of 0.2 L/min.
Implications: Utilization of worthless oil fly ash from power plant is important not only for cleaning the environment but also for solid waste minimization. This research scope is to eradicate one pollutant by using another pollutant (waste ash) as a raw material. Chemical functionalization of synthesized activated carbon from oil fly ash would lead to attachment of functional groups of basic nature to attract the acidic H2S. Such type of treatment can enhance the uptake capacity of sorbent several times. 相似文献
13.
Analyses on phenological and morphological variations of mangrove forests along the southwest coast of Bangladesh 总被引:1,自引:0,他引:1
Drastic changes in river discharge and salinity levels are threatening the phenology and morphology of the coastal mangrove forests of the Sundarbans of Bangladesh. We have used AVHRR GIMMS (1985–2006) and MODIS (2005–2010) satellite Normalized Difference Vegetation Index (NDVI) data to identify the temporal variation of the phenology of the mangroves. Linear interpolation and Fourier-based adjustment were applied to remove noise from the NDVI time series. Then linear regression analysis on a single area (8 km ? 8 km) and a composite of 36 areas for three NDVI statistics the annual minimum, annual average, and annual maximum were performed--over the time periods 1985–1990, 1990–2000, 2000–2006 and 2005–2010 to identify possible functional changes in NDVI time series around the Sundarbans. Furthermore, we used fourteen LANDSAT images spanning the period 1989–2010 to estimate the spatiotemporal rate of shoreline changes over the three time periods 1989–2000, 2000–2006, and 2006–2010. A decreasing trend in the annual minimum NDVI was observed in most of the areas of the Sundarbans for the period 1990–2000. During the years 2000–2006, the trends of the three NDVI statistics became significantly positive, indicating an improvement of the mangrove phenology. In the period 2005–2010, a decreasing trend in all the NDVI variables was again dominant. The coast underwent rapid erosion from 1989–2000 and 2006–2010. However, the rate substantially declined between 2000 and 2006, when accretion was dominant. The advent of the upstream Farakka barrage caused a significant reduction in the Ganges-Gorai River discharge and increased the salinity in and around the Sundarbans. Our study concludes that this may be responsible for the degradation of mangrove phenology and accelerated erosion in the earlier and recent periods. In the interim, 2000–2006, improved river discharge and salinity levels due to the Ganges water sharing agreement (1996) and dredging of the Gorai River bed (1998–1999) enhanced the mangrove phenology and helped the coast to gain land. 相似文献
14.
Metal contamination of surface soils of industrial city Sialkot,Pakistan: a multivariate and GIS approach 总被引:3,自引:0,他引:3
Riffat Naseem Malik Waqar Azeem Jadoon Syed Zahoor Husain 《Environmental geochemistry and health》2010,32(3):179-191
In this study concentrations of selected metals viz., Ca, Cd, Co, Cr, Cu, Fe, K, Mg, Na, Ni, Pb and Zn in surface soils of
Sialkot city known worldwide for tanneries and pharmaceutical industries were measured to assess the status of urban soil
pollution and to identify sources of contamination. Hierarchical cluster analysis (HACA) indicated concentrations of Mg and
Ca related to parent rock material, Cd, Co, and Pb with traffic related activities, Cr, Cu, Ni and Zn either associated with
automobiles activities or industrial pollution and Fe, K and Na related with anthropogenic activities or lithogenous materials.
Correlation analyses and principal component analysis based on factor analysis confirmed the results of HACA. Spatial distribution
maps exhibited relatively higher concentrations of Cd, Co, Cu, Ni, Pb, Cr and Zn along traffic routes in the city and streams.
The results highlighted concentration of Cd, Ni, Cr, Zn, and Pb measured in urban soil exceeded the permissible limit of surface
soils and advocated an imperative need for detailed baseline investigations of spatial distribution of heavy metals and other
contaminants for the formulation of geochemical database that should be made available to stakeholder involved in monitoring,
assessment and conservation of soil contamination for future planning and management of the Sialkot city. 相似文献
15.
Abid Ali Khan Rubia Zahid Gaur V.K. Tyagi Anwar Khursheed Beni Lew Indu Mehrotra A.A. Kazmi 《Resources, Conservation and Recycling》2011,55(12):1232-1251
The upflow anaerobic sludge blanket (UASB) process is reported to be a sustainable technology for domestic wastewaters treatment in developing countries and for small communities. However, the inability of UASB process to meet the desired disposal standards has given enough impetus for subsequent post treatment. In order to upgrade the UASB based sewage treatment plants (STPs) to achieve desired effluent quality for disposal or for reuse, various technological options are available and broadly differentiated as primary post-treatment for the removal of organic and inorganic compounds and suspended matter; secondary post-treatment for the removal of hardly degradable soluble matter, colloidal and nutrients; and polishing systems for removals of pathogens. Hence, this paper discusses the different systems for the treatment of UASB reactor effluent treating sewage. Additionally, a comparative review, an economic evaluation of some of the emerging options was conducted and based on the extensive review of different integrated combination, i.e. UASB-different aerobic systems, a treatment concept based on natural biological mineralization route recognized as an advanced technology to meet all practical aspects to make it a sustainable for environmental protection, resource preservation and recovering maximum resources. 相似文献
16.
Ishak Khairul Anwar Safian Nur Azmina Mohamed Annuar Mohamad Suffian Mohamad 《Journal of Polymers and the Environment》2022,30(4):1662-1672
Journal of Polymers and the Environment - The application of microbiologically produced polymer, i.e., medium-chain-length poly-3-hydroxyalkanoate (mcl-PHA), in environmental remediation technology... 相似文献
17.
Phulpoto Anwar Hussain Qazi Muneer Ahmed Haq Ihsan Ul Phul Abdul Rahman Ahmed Safia Kanhar Nisar Ahmed 《Environmental science and pollution research international》2018,25(17):16578-16578
Environmental Science and Pollution Research - The original publication of this paper contains a mistake. 相似文献
18.
Ahmad Manzoor Khattak Shoukat Iqbal Khan Anwar Rahman Zia Ur 《Environmental and Ecological Statistics》2020,27(2):203-232
Environmental and Ecological Statistics - The paper proposes a new perspective in the environmental and resource economics literature by examining innovation (measured by R&D expenditures),... 相似文献
19.
Boiling of water, for purification, commonly practiced in the world, has many problems associated with it like danger of scalding,scaling in the vessels, removal of useful minerals and blandness of taste etc. Water can be made safe for drinking simply by heating at 65℃ for 6 minutes. A colour indicating strip was developed which changes colour from red to purple at 67℃. Use of this strip can help in pasteurizing water without the above problems and with considerable energy saving. 相似文献
20.