Acidophiles are a group of microorganisms that thrive in acidic environments where pH level is far below the neutral value 7.0. They belong to a larger family called extremophiles, which is a group that thrives in various extreme environmental conditions which are normally inhospitable to other organisms. Several human activities such as mining, construction and other industrial processes release highly acidic effluents and wastes into the environment. Those acidic wastes and wastewaters contain different types of pollutants such as heavy metals, radioactive, and organic, whose have adverse effects on human being as well as on other living organisms. To protect the whole ecosystem, those pollutants containing effluents or wastes must be clean properly before releasing into environment. Physicochemical cleanup processes under extremely acidic conditions are not always successful due to high cost and release of toxic byproducts. While in case of biological methods, except acidophiles, no other microorganisms cannot survive in highly acidic conditions. Therefore, acidophiles can be a good choice for remediation of different types of contaminants present in acidic conditions. In this review article, various roles of acidophilic microorganisms responsible for removing heavy metals and radioactive pollutants from acidic environments were discussed. Bioremediation of various acidic organic pollutants by using acidophiles was also studied. Overall, this review could be helpful to extend our knowledge as well as to do further relevant novel studies in the field of acidic pollutants remediation by applying acidophilic microorganisms.
With cities sprawling and populations booming in developing regions, ensuring social sustainability in urban areas has become more urgent. This study investigates the challenges of implementing social sustainability initiatives for cities in developing countries, focusing on Dhaka as a representative city. A mixed-method approach involving structured questionnaire surveys and key informant interviews was used to collect quantitative and qualitative data. The study identified eighteen challenges to implementing social sustainability initiatives in Dhaka city, including a lack of poor urban governance, an inefficient city management system, a lack of political stability, a long delay in the planning approval process, etc. Additionally, experts identified additional challenges that require attention. The study offers empirical evidence to assist government officials, policymakers, and urban planners overcome these challenges and implement social sustainability effectively. To address the identified challenges, the study recommends revisiting the Structure Plan, Urban Area Plan, Detailed Area Plan, and Urban Sector Policy-2011. It highlights the crucial role of community social workers in mitigating specific issues in socially sustainable urban development. Eventually, the study will contribute to the implementation of SDG-11 in the 2030 Agenda for Sustainable Development by bridging the gap between urbanization and socially sustainable cities.