Case study MunicipalWastewater

Capacity 50,000m3/d

Challenges

Faced by Existing Plants The design capacity of the WWTP is 50,000,m3/d，the A2/O process be applied for biological treatment process, below data shows the influent and effluent parameters of the existing plant：

The effluent parameters requirement of completed plant

Solution

Placing MBBRl media into activated sludge basins creates a combination of suspended and attached growth biology that optimizes the benefits of both of these systems. Each individual piece of MBBR media has been specifically designed with a very high surface area-to-volume ratio to support the growth of biofilm. The surface area provided by the MBBR media creates additional active biology above and beyond the limits of the suspended activated sludge system.

This can increase reactor capacity, in terms of organic loading, or support more advanced treatment of the wastewater due to longer sludge age. The additional fixed film biomass does not need to be settled out and returned and therefore does not increase the solids loading to the secondary clarifier, a factor that often limits the treatment capacity of activated sludge systems. IFAS technology addresses the need for increasing activated sludge plant capacity without additional clarifier or aeration basin volume. The fixed biomass also contributes to the ability of the process to respond to organic or hydraulic shock loads and to recover from upsets.

The MBBR IFAS process is the perfect solution for upgrading existing plants to support Biological Nutrient Removal without adding reactor volume. Portions of existing aerobic zones can be partitioned into anaerobic or anoxic zones for advanced BNR treatment and the addition of MBBR media to the remaining aerobic zones increases the Solids Retention Time (SRT) to a level needed for nitrification.

Results

Effluent COD and NH4-N were well removed, the effluent quanlity could conforms to owner’s permitted criteria.