Municipal sewage sludge can produce biodiesel at low cost. Using newly developed technology, they can obtain biodiesel fuel from urban sewage sludge. Compared with ordinary diesel oil extracted from petroleum, its production cost per gallon (1 gallon is about 3.8 liters) is only about 10 cents higher. Urban sewage sludge is the residual material left after the sewage treatment plant treats the urban sewage. In the bi-monthly journal of Energy and Fuel published by the American Chemical Society, researcher David Cagebo wrote that the demand for biodiesel has led to the search for low-cost biodiesel feedstock. Soybeans, sunflower seeds and other crops have been used as raw materials for biodiesel, but their prices are on the high side. Sewage sludge is an attractive alternative to biodiesel feedstock. Their supply is very rich, and the amount of sewage sludge in the United States alone is as high as 7 million tons per year. Cagbo said that sludge is a good source of biodiesel feedstock. To help the production of biodiesel, sewage treatment plants can use microorganisms to increase the content of grease. This measure alone may increase the annual output of biodiesel to 10 billion gallons, which will be more than three times the current US national biodiesel production. In terms of long-term development, the production of biodiesel from sewage sludge will be very profitable. The current production cost per gallon of biodiesel is approximately US $ 3.11. To make biodiesel competitive in the market, the production cost of biodiesel should be reduced to the cost of $ 3 per gallon of ordinary diesel, or lower. However, the article cautiously stated that the use of sewage sludge to obtain biodiesel technology for commercialization still has considerable challenges, including sludge collection, separation of biodiesel from other substances, stability of biodiesel quality, and fatty acids in the production process Salt formation and management issues.
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