Process Optimization of a Municipal WWTP in South China after Upgrading

WWTP; upgrading; nitrogen and phosphorus removal; process optimization; sludge nitrification rate; accurate chemicals addition; fall re oxygenation

The discharge standard of a wastewater treatment plant after upgrading was raised from the national first level B to level A and the local standard of Guangdong Province. The new discharge limits on total nitrogen, ammonia nitrogen and total phosphorus, were 25%, 37.5% and 50% lower than those of the original standard. The main process was still AAO oxidation ditch after upgrading, which posed a great challenge to the operation and management. The process operation was optimized by analysis of sludge nitrification rate, total nitrogen and total phosphorus composition, accurate chemicals addition, fall re oxygenation, and etc.