Production and beneficial impact of biochar for environmental application: A comprehensive review

[Display omitted] •Review the existing knowledge on the biochar properties and its future perspectives;•Biochar derived from physic-chemical and bio-engineering techniques from feedstock’s;•Different modification technologies were mentioned in this review;•Modified biochar had better function in application compared with original biochar;•Providing cumulative information for environmental application of biochar. This review focuses on a holistic view of biochar, production from feedstock’s, engineering production strategies, its applications and future prospects. This article reveals a systematic emphasis on the continuation and development of biochar and its production methods such as Physical engineering, chemical and bio-engineering techniques. In addition, biochar alternatives such as nutrient formations and surface area made it a promising cheap source of carbon-based products such as anaerobic digestion, gasification, and pyrolysis, commercially available wastewater treatment, carbons, energy storage, microbial fuel cell electrodes, and super-capacitors repair have been reviewed. This paper also covers the knowledge blanks of strategies and ideas for the future in the field of engineering biochar production techniques and application as well as expand the technology used in the circular bio-economy.