MBBR Bio Filter Media Combination Retention Screen
The MBBR bio filter media combination retention screen ensure all the MBBR bio carriers remain in their respective zones for the duration of the plant’s life. MBBR carrier media retention screens are available in cylindrical or flat models, depending on a facility’s needs and utilize either a wedge wire or perforated plate design. Each retention screen has a specific opening allowing for smooth operation with the smallest number of screens, while also creating minimum head loss per stage.
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Product Introduction
Product Description
The MBBR bio filter media combination retention screen ensure all the MBBR bio carriers remain in their respective zones for the duration of the plant’s life. MBBR carrier media retention screens are available in cylindrical or flat models, depending on a facility’s needs and utilize either a wedge wire or perforated plate design. Each retention screen has a specific opening allowing for smooth operation with the smallest number of screens, while also creating minimum head loss per stage.
 | * Case Study: Municipal Wastewater * Start Up: October 2016 * Capacity: 200,000 m3/d * Location: Anhui China |
Challenge
Existing biological treatment plant is A/O oxidation ditch process, customer required that the effluent standard should be up from one-class B to one-class A , to solve the problem of COD and NH4-N out of standard.
Solution
| One cost-effective solution to achieve nutrient removal is the biological treament process. This process employs the benefits of fixed-film systems into the suspended growth activated sludge process. This hybrid process is referred to as Integrated Fixed-film Activated Sludge (IFAS) technology. The IFAS process is typically divided into a series of stages that include anaerobic, anoxic, and aerobic volumes. Within the IFAS process, media is filled in the aerobic stages and retained by stainless steel MBBR combination retention screen located at the effluent end of the process stage. |  |
Results
The plant operates efficiently since the start up. Due to the low water temperature of 10℃, an almost full development of the biofilm was noticed in less than a month.
The COD average value of the effluent is 60 ~ 65mg/l before oxidation ditch reform, and the NH4-N was 5 ~ 10mg/l, which could not meet the effluent standard of class A.After the transformation, the average effluent COD was below 50mg/l, and the NH4-N was below 2mg/l. After post deep bed denitrification process, the COD average value of effuent is below 40mg/l, and the total nitrogen is below 10mg/l, it could meets the requirements of class A effluent standard.
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