SCH Number 2001101120

Project Info

Title

Joint Outfall System Nitrification/Denitrification Facilities

Description

The proposed projects will include the construction of NDN facilities at the Districts' five WRPs. The Projects' facilities include the modification of existing aeration basins incorporating either the Modified Ludzack-Ettinger or Step-Feed NDN processes. Due to capacity limitations at the WNWRP, a second clarifier will be added to the treatment system. The proposed facilities will provide for the removal of TIN and ammonia, allowing the Districts to meet the TIN and ammonia limits of existing WDR permits. However, by removing the ammonia in the wastewater to meet permit limits, the Districts are faced with the potential formation of THMs, a known carcinogen that forms during the chlorination disinfection process in the absence of ammonia. To achieve both removal of ammonia and reduction of THM formation, the Districts will add a small amount of ammonia to the wastewater prior to disinfection.

4 documents in project