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ฝาก paper ไว้ให้คนสายชีวะและสิ่งแวดล้อมอ่านหน่อยครับ http://www.lanfaxlabs.com.au/papers/P53-03-Szymanski-Patterson.PDF
Abstract The use of effective microorganisms (EM) for reducing volumes of sewage sludge has often been suggested as feasible in either wastewater treatment plants or on-site wastewater treatment systems such as septic tanks. The organisms are supposed to eliminate the volumes of sludge produced, with the benefits of reduced sludge handling, and consequently lower costs and decreased impacts upon the environment. This project aimed to test the hypothesis that EM is beneficial in reducing sludge volumes. Two areas of experimentation were undertaken, one at a controlled experiment at the Coffs Harbour Wastewater Treatment Plant (CHWTP) and a second on five domestic septic tanks in the Armidale-Dumaresq area (northern NSW).
Results from CHWTP showed a significant decrease in pH levels with increased EM dose, improved settlement of the sludge, but a significant increase in BOD5. There was a significantly higher level of solids in the treated tanks compared to the control. The lack of consistency between the tank treatments with respect to quality and quantity of sludge remained an issue. The septic tanks indicated a pattern of similar conditions following a final application, suggesting domination by a particular type of microorganism. However, there was no reduction in suspended solids content in the effluent.
It is concluded that there were not sufficient changes to sludge volume (CHWTP) or suspended solids (septic tanks) to indicate a clear benefit from the use of EM in wastewater.
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