PurposeThe aim of the present study is to assess the selected heating systems (furnace and boiler) commonly used in the dwellings of seven post-USSR (the Union of Soviet Socialist Republics) countries. The systems were assessed in terms of their cost and environmental performance, with natural gas and electricity used as the main source of energy.Design/methodology/approachThe cost-effectiveness and environmental performance of the selected heating systems that have been commonly used in the selected post-USSR countries was assessed. Current energy (natural gas and electricity) prices that are applied in those countries were used.FindingsResults show that the furnace is the cheapest option, while natural gas is the cheapest source of energy, despite its high price in Tajikistan and Kyrgyzstan. Both heating systems could be considered eco-friendly options, although their efficiencies need to be considered at the design stage. Turkmenistan, Uzbekistan and Kazakhstan, which are the top natural gas producers, offer natural gas for the selected heating systems as both cost-effective and eco-friendly options.Practical implicationsA considerable reduction in electricity consumption and less harm to our environment can be achieved through the systems used in residential buildings in the region.Originality/valueThe outcomes of the present study offer value (in terms of cost-effective and eco-friendly options) for the end-users in the region.

The purpose of this study is to investigate the use of maize cob carbon powder as an adsorbent for the removal of zinc (II) and chromium (VI) ions from industrial effluent. The non-degradable and toxic nature of these metal ions make their removal from wastewater crucial prior to discharge into the environment. Despite the many techniques that have been developed for the removal of heavy metals, many have proven to be inefficient, generate sludge, and are expensive. Adsorption processes have been shown to be one of the most efficient methods for the removal of toxic metal ions from contaminated water. Activated carbon is commonly used for this purpose but is expensive. Considering this, the search for more economical and safe options has led to the investigation of low-cost adsorbents as alternatives to activated carbon. In this study, maize cob carbon powder was chosen as the adsorbent due to its low cost, non-toxicity, and availability. A batch experimental approach was utilized to investigate the effects of temperature, pH, adsorbent loading, contact time, and initial metal ion concentration on the adsorption process. The results of the study indicate that maize cob carbon powder can be effectively used as an economical adsorbent for the treatment of contaminated water.

The purpose of this study is to investigate the use of maize cob carbon powder as an adsorbent for the removal of zinc (II) and chromium (VI) ions from industrial e uent. The non-degradable and toxic nature of these metal ions make their removal from wastewater crucial prior to discharge into the environment.Despite the many techniques that have been developed for the removal of heavy metals, many have proven to be ine cient, generate sludge, and are expensive. Adsorption processes have been shown to be one of the most e cient methods for the removal of toxic metal ions from contaminated water. Activated carbon is commonly used for this purpose but is expensive. Considering this, the search for more economical and safe options has led to the investigation of low-cost adsorbents as alternatives to activated carbon. In this study, maize cob carbon powder was chosen as the adsorbent due to its low cost, non-toxicity, and availability. A batch experimental approach was utilized to investigate the effects of temperature, pH, adsorbent loading, contact time, and initial metal ion concentration on the adsorption process. The results of the study indicate that maize cob carbon powder can be effectively used as an economical adsorbent for the treatment of contaminated water.

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This paperwork studies a biosorption method in waste and drainage water treatment in the Don river basin under Voronezh climate conditions. The research question is: how an effective biosorption method in the Voronezh region. In this experiment Eichhornia (water hyacinth) is used as a biosorbent plant and the authors analyze the removing of some contaminants with eichhornia from wastewater. The experiment took place in the Rozhdestvenskaya Khava village of the Novousmansky district in the Voronezh region. According to experimental parameters in a period of 30 days, the effectiveness of this method is examined. An experiment is compared with similar previous experiments. Finally, at the end of this article the authors list conclusions and some recommendations according to the results of the experiment.