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This wastewater-treatment technology can cut sludge by 50% or more

By Chemical Engineering |

A biological wastewater-treatment technology can reduce sludge by 50% or more in some situations compared to the amount generated by a traditional activated-sludge wastewater-treatment process, according to The Dow Chemical Co. (Midland, Mich.; http://www.dow.com). Actual sludge reductions vary based on the particulars of the water stream and the specific contaminants at the site. The lowered sludge generation can significantly extend the life of a landfill and lower disposal costs. Dow began marketing the technology last month to the petroleum refining industry. Known as Automated Chemostat Treatment (ACT), the technology was developed by BioPetroClean (New York; http://www.biopetroclean.com) as a more efficient way to reduce levels of total petroleum hydrocarbons (HCs) in either fresh or salt wastewater. ACT is based on the application of a customized bacterial cocktail to a wastewater tank. The bacteria mix is tailored for a specific application and a particular plant. The process depends on identifying and selecting indigenous HC-consuming species that are young and entering the log-growth phase of their lifecycle and subjecting them to a proprietary nutrient package that can be continuously adjusted inside a bioreactor. “No…
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