Design of Indigenous Small Scale Low-Cost Tubular Biogas Digester with Portable Container Box /

Abstract

This research addresses Pakistan's energy crisis and its impact on small households by proposing an Indigenous Small Scale Low-Cost Tubular Biogas Digester within a Portable Container Box. The compact digester is designed to meet the energy needs of small households, a critical improvement over larger models available in the market. Housed within a specially designed portable container box for easy installation, portability, and protection, this solution aims to overcome the limited availability of suitable tubular biogas digesters in Pakistan, particularly for small rural households.

The Tubular Biogas Digester's theoretical output of 0.43 m3 per day surpasses the 0.42 m3 peak output of the compared pseudo dome biogas digester, underscoring the enhanced viability of the proposed solution.

Moreover, financial viability is confirmed through several key indicators. The Net Present Value (NPV) of Rs 5,526.18, calculated with an 8% discount rate, signifies that expected cash inflows from the project surpass initial investment costs, establishing its feasibility. The Return on Investment (ROI) of 15.95% demonstrates robust profitability relative to project costs. The Discounted Payback Period (DPP) of 9.05 years, well within the 10- year project lifespan, suggests not only the recovery of the initial investment but also positive cash flows in the future. The Internal Rate of Return (IRR) at 9.5%, exceeding the discount rate, further reinforces financial feasibility and positive returns.