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| Municipal Sewage Sludge/BioSolids | |
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Environmental Energy Company's technology enables municipal treatment facilities to significantly increase their solids processing capacity while at the same time improving the quality and efficiency of their operations. Our technology for improving municipal treatment is based on the patented AGF Process. This basic process has been improved through its application on a number of projects. Improvements address: removal of inorganic sands and silts; gas cleaning for efficient reuse; and CO2 sequestering for controlling scale (struvite) formation. We have also developed the "Simply Class A" Process which is the most economical and energy efficient process for producing a Class A product. Patents are pending on each of these improvements. The AGF process has been assessed by a variety of organizations involved in municipal treatment. The Water Environment Federation described it in its "Biosolids Management: Assessment of Innovative Processes." The Seattle regional sewage treatment provider, King County Metro, performed an extensive study of alternative wastewater practices. They concluded: "..the AGF process can attain similar or greater solids destruction than conventional digestion systems with one-half to one-third the digester volume. Certainly the greatest benefit to King County is the potential to increase the capacity of the existing digesters by two to three times. The additional benefit of more gas production and less biosolids to dewater, haul and apply make this an even more attractive technology." See the excerpted pages in PDF of King County's assessment We have prepared a example economic analysis in which we show the AGF Benefits based on soley operational savings. This is available as a PDF document, AGF Economic Benefits Deriving from Energy Production and Solids Disposal Reduction |
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After having designed, built, and monitored the AGF for full scale facilities, the following has been observed about the process: |
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| • its economic benefits will pay for any capital costs in less than two years. | |
| • it expands the capacity of digesters by 2 to 3 times their current capacity. | |
| • it uses less energy than that required to mix a single digester. | |
| • it substantially improves the volatile solids destruction by converting 70% to 80% of the solids to gas as compared to 40% for aerobic digestion and 50% to 60% for conventional and thermophilic digestion. | |
| • it produces a Class A pasteurized product which is not restricted in its use by the public. | |
| • unlike other Class A processes, it consumes no additional energy than required to heat a conventional digester. | |
| • it produces an odorless product, unlike othe digestion and stabilization processes. | |
| • it does not require extensive sludge pre-thickening. A more dilute raw sludge can be fed to the digester. | |
| • it reduces the time to dewater solids by a factor of 4 to 5 the time to dewater using conventional belt presses. Hence, the capacity of existing dewatering facilities is substantially improved and the allocation of staff to that operation is reduced. | |
| • it eliminates the need to store biosolids, since more sludge can be stored in the digesters by increasing the solids concentration. | |
| • it eliminates foaming. | |
| • it eliminates struvite scaling. | |
| • it produces a high quality gas containing 75% to 80% methane and little sulfide. | |
| • it produces a high quality effluent from which nitrogen and phosphorus can be recovered much more economically than other processes. |
| email: engineer@makingenergy.com |
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phone 360-923-2000
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