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The demand of sewage treatment plants is increasing day by day, especially in the countries like India. Biological and chemical unit of such sewage treatment plants are critical and needs to be designed and developed to achieve desired level of reliability, maintainability and availability.

This paper investigates and optimizes the availability of biological and chemical unit of a sewage treatment plant. A novel mathematical model for this unit is developed using the Markovian birth-death process. A set of Chapman–Kolmogorov differential equations are derived for the model and a generalized solution is discovered using soft computing techniques namely genetic algorithm (GA) and particle swarm optimization (PSO).

Nature-inspired optimization techniques results of availability function depicted that PSO outperforms GA. The optimum value of the availability of biological and chemical processing unit is 0.9324 corresponding to population size 100, the number of evolutions 300, mutation 0.6 and crossover 0.85 achieved using GA while PSO results reflect that optimum achieved availability is 0.936240 after 45 iterations. Finally, it is revealed that PSO outperforms than GA.

This paper investigates and optimizes the availability of biological and chemical units of a sewage treatment plant. A novel mathematical model for this unit is developed using the Markovian birth-death process.

Availability model of biological and chemical units of a sewage treatment is developed using field failure data and judgments collected from the experts. Furthermore, availability of the system has been optimized to achieve desired level of reliability and maintainability.

India is one of the world's largest exporters of products and services. Given the outstanding contribution of services in India's foreign trade, this study examines the changing international trade pattern for India. It is a nation that is heavily dependent on imports and exports. This study examines the changing international trade pattern for India with the existence of certain global disruptions. The analysis highlights a growing trade surplus in services and an increasing trade deficit (i.e. imports higher than exports) in goods. India needs to have policies in place to emerge as a strong economy in this post-pandemic era. This chapter provides a set of examples based on the research findings. The research suggests that the growing economy and supportive government policies offer greater opportunities for the country in the longer period if urgent policy initiatives and support are extended to existing and potential manufacturing and services sectors. It ultimately seeks to highlight key opportunities, challenges and suggestions to protect and promote India's international trade.