How to Produce Electricity from Sanitation & Supply Water From The Electricity

A city of Denmark as the world's first city power generation with sewage and drainage water and going to use it to supply water in the city.

Because of Aarhus city's Marselibarga wastewater treatment plant improvement, it will be capable of producing 150 percent more electricity. This is more than the plant’s total electricity demand. 200,000 people who living in the urban, required water will be supply with the additional power. After all needs the excess electricity to be sold the local grid.

The plant generates electricity by creating bio-gas from the city’s sewage and water used for domestic purposes. General Manager of Aarhus water Lars SCODA said, "We did not use wind turbines, solar panels or any additional waste from the restaurant to generation electricity."

This technology is not new, but the harsh environment law of disposal of waste and achieves reduction of nitrate and phosphate pollution and co-ordination between them, daily and seasonal pressure in the pipes that to be control by energy recovery and reduce maintenance costs for these infrastructures has been the main supporter to achieve the success in Aarhus. 

Though in order to increase Marselibargera's facilities massive investments of approximately 3 million euros are needed, Aarhus Water expects, through low maintenance costs and the sale of excess electricity will be able to regain it within five years.

Other cities of Denmark, including Copenhagen, are trying to emulate Aarhus example.
As a result of the growth of the world population, especially in developing countries in order to supply water will require more electricity. According to the IEA's World Energy Outlook 2016, next 25 years, the amount of electricity used will double in the water sector.