Water purification unit generates its own energy

Jul 25, 2011

A new biological water purification facility developed by Siemens generates enough methane gas to power its own operations. It also produces much less sludge than conventional systems. The pilot facility for this process, which is located at a site run by Singapore’s Public Utilities Board, has been operating in an energy- neutral manner since June 2010. Now, the city state is building a much larger pilot facility – one that will process 300 times more effluent than its predecessor, or about as much sewage water as is produced by around 1,000 people.

A typical urban biological purification facility accommodates water from 10,000 to 100,000 residents. Today an aerobic (ventilated) process is used in which bacteria break down impurities in water by digesting them and converting them into new bacterial substances. This produced bacteria flakes filled with impurities — forming sludge that is then separated and either deposited in landfills or burned. But the organic impurities contain ten times more energy than needed to do the cleaning itself. They can therefore be used to generate , which could be used in gas-fired power plants or combined heat-and-power plants. However, sludge concentrations in municipal sewage systems are too low to produce methane economically. 

With this in mind, development engineers from Water Technologies have developed a technology for charging bacteria flakes with organic impurities for an extremely short time during ventilation. As a result, bacterial reproduction is minimized. After most of the water is separated, the bacteria ferment the impurities into methane in an anaerobic process step. After two aerobic steps and one anaerobic step, the sludge has been broken down so that the least possible amount of remains and the largest possible amount of methane is available, as reported in the latest issue of the research magazine "Pictures of the Future".

The pilot facility now in operation cleans around half a cubic meter of wastewater per day. A conventional water treatment plant requires a little less than 0.25 kilowatt-hours of energy to do this, so the pilot unit needs to generate roughly that amount of energy in the form of methane. A bigger facility could be run in an energy- neutral manner. Market launch of the technology is scheduled for 2012.

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User comments : 3

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poof
1 / 5 (2) Jul 25, 2011
So its a fart powered plant?
tarheelchief
5 / 5 (1) Jul 26, 2011
This is a wonderful solution for the African,South American,and Middle Eastern nations.
Lord_jag
not rated yet Jul 28, 2011
It's wonderful for all nations if it can be scaled up enough.

Right now 1 cubic meter of water per day. Is there any reason it couldn't work for city with a million people? Perhaps one on every city block.