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Natural gas (methane) forms an essential part of modern power supply. However, natural gas storage and transportation are associated with fire and explosion hazard, which restricts extensive application of natural gas as a fuel. The adsorption technique is among the most promising and safe ways for natural gas storage and transportation, which allows a significant increase in the methane density up to values characteristic of liquids as a result of physical adsorption in microporous adsorbents at moderate pressures. The review considers adsorption systems for natural gas (methane) storage based on metal-organic frameworks, which possess high characteristic energy of adsorption and a regular nanoporous structure with high pore volumes and specific surface areas. The possibility of controlling the porous structure and physicochemical behaviour of metal-organic frameworks during their synthesis and functionalization is analyzed, including the fabrication of composites and shaping, which may enhance their performance in the adsorption storage and transportation of natural gas. The bibliography includes 315 references.

Selection of a suitable site for constructing a new landfill is one of the most challenging issues for town planners in developing countries. A study was conducted to locate the most suitable site for constructing a sanitary landfill in the city of Harare using Geospatial techniques and Multi-Criteria Evaluation. To identify appropriate landfill sites, nine input map layers including proximity to settlements/built up area, proximity to protected areas, proximity to airports, proximity to road and railway networks, surface water, slope, elevation and soil type were used for mapping, analysis and evaluation. Each criterion was identified and weighted using Analytic Hierarchy Process. A final map was generated which identified potential areas for the location of a landfill site. Results revealed that 1.31% of the total area of Harare was identified as mostly suitable, 24.73% as moderately suitable to suitable and 76.96% as unsuitable to construct a sanitary landfill. Six sites were identified as most suitable sites for a landfill. These selected sites require further geotechnical and hydrogeological analyses to identify the final site in the city to construct a sanitary landfill.

The use of gas fuel has considerable environmental advantages over traditional types of fuel based on petroleum products or fossil coal. The adsorption technology for methane (natural gas) uptake, storage and transportation can serve as a connecting link in gas supply to customers. The review considers characteristics of adsorption systems for methane storage. The key methods used for the synthesis of microporous carbon adsorbents based on various organic and inorganic carbon-containing compounds are described. Methods for increasing the efficiency of methane storage systems based on carbon adsorbents are analyzed. Theoretical approaches to optimization of the properties of methane – carbon adsorbent systems are discussed. The bibliography includes 174 references.