Jul 31 2011
Teijin Limited announced today that a pilot project conducted with the Japan Sewage Works Agency (JSWA) over a period of two and a half years has demonstrated the effectiveness of an energy-saving municipal sewage processing system based on Teijin’s Multi-Stage Activated Biological Process (MSABP) wastewater treatment technology.
In the first-half of the project, an 18-month pilot test conducted through last year, it was shown that a wastewater treatment flow using MSABP for the raw water from the first sedimentation pond with no final sedimentation pond can reduce excess sludge by 87% and energy consumption including energy for sludge treatment by 8%, compared to the standard activated sludge process.
In the second half of the project, Teijin and JSWA removed the first sedimentation pond and maintained the final sedimentation pond to create a treatment flow similar to the oxidation ditch process, which is commonly adopted in small-scale sewage treatment facilities. The results showed that the MSABP-based system can reduce excess sludge by 78% and energy consumption including energy for sludge treatment by 12%, compared to the oxidation ditch process. In addition, it demonstrated that a carbonaceous biochemical oxygen demand (CBOD, a water quality indicator) of less than 15mg/L can be stably achieved and that the nitrogen component in sewage, which can cause red tide and algae blooms, can be gasified and eliminated.
Teijin’s MSABP system utilizes special biological carriers packed with high concentrations of microorganisms in multistage aeration tanks. The microorganisms are changed from tank to tank to form a food chain, in which even highly concentrated or persistent effluent is decomposed. The system significantly suppresses the generation of excess sludge, thereby eliminating the need for sludge disposal. The result is a low-maintenance, cost-effective solution that uses reduced amount of energy.
Currently, Teijin’s MSABP system is being used for wastewater treatment in chemical, dyeing and food manufacturing plants in Indonesia and China. It also is being field tested for sewage treatment in the rural community of Yixing, Jiangsu Province, China. Recently, a textile factory in Angola selected the MSABP system for its wastewater treatment. Teijin will continue to develop a wide range of wastewater treatment solutions that boast superior effectiveness and environmental friendliness for applications worldwide.
MSABP is a registered trademark of Aquarius Technologies Inc.