IELTS Writing Task 1 Sample Essay #1: Process Diagram, Electricity from Household Compost

The present process diagram depicts the seven stages involved in an innovative electricity generation method, using methane fermented from household compost.

Overall, the process involves two stages, namely methane production and electricity generation. Methane is first captured, stored, and compressed; it is then burned to produce electricity. In this way, a home can meet a portion of its power needs in an environmentally friendly way and without paying for electricity from the grid.

In the first stage, capturing methane is accomplished by placing a steel tank in the ground and filling it up to 75% with compost, which includes leaves, food, and scraps. After water is added, the fermented methane from the mixture is captured and transferred to a storage via several pipes. Next, the gas is compressed, and then it is transferred to the electricity generation phase through a long pipe.

In the second stage, the gas is burned in the combustion engine, which releases mechanical energy. Next, the mechanical energy is transformed into electrical energy in a generator and transferred to a large battery, where it is stored. Finally, the electricity, which was being stored, is connected to the home’s electrical system.

(194 words)

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