SIZE OF WWTP 22 000 m3/d (5 812 000 GPD)
START OF OPERATION November, 2013
Issue
Soon after the reconstruction of WWTP and launching a new biological reactor with EPDM membrane disc diffusers in 2009, the aeration system appeared to be highly uneconomical. In order to keep the constant dissolved oxygen DO concentration of 1.5-2.0 mg O2/l in the reactor, three blowers with capacity of 4500 m3/h each had to work continuously almost all the time.
Solution
Because of its low economic efficiency and tearing of some diffusers noticed at the beginning of 2013, it was decided to replace the existing aeration system. Esmil company installed 600 m (1970 ft) of highly efficient PE tube air diffusers with high mechanical strength and longevity. Previously installed air diffusers were replaced gradually section by section.
Results
| Bioreactor Size | 3 sections, 6000 m3 (1,6 MG) each with an operating height approx. 6 m |
| Type of biological treatment process | Aerobic suspended growth |
| DO concentration | 2.0 mg O2/l |
| Supply air flow rate | 4500-9000 m3/h (2650-5300 cfm) |
End User’s Comment
After we launched the first section of the reactor with Esmil tube air diffusers, the quantity of consumed air as well as the energy was significantly reduced. Wastewater saturation with oxygen became more stable and uniform throughout the whole basin. After the old aeration system in all reactor sections was replaced with Esmil air diffusers, the quantity of consumed air was reduced up to 3
times. From November 2013 so far there has been no diffuser breaking detected or any other problems occurred.
