Technical Abstract: Reductions in wastewater malodor that were effected by a second generation implementation of Environmentally Superior Technology (EST) were monitored over a 15 month period that encompassed three cycles of pig production. The wastewater treatment system consisted of three modules: solids separation, biological nitrogen removal, and phosphorus recovery/wastewater disinfection. While approximately over 90% of the wastewater suspended solids were removed in the first stage of treatment, little reduction in malodorous compounds occurred, indicating that malodors largely remained with the liquid waste stream. The greatest improvements in wastewater quality occurred in the nitrogen treatment module: there was over 99% reduction in aromatic malodors (e.g. p-cresol, skatole) and almost 90% reduction in volatile fatty acids (e.g. propanoate and butanoate) in nitrogen module effluent as compared to raw flushed manure. The system consistently achieved high performance standards, even during the first cycle of livestock production when system performance was being optimized. These findings showed that the combination of two simple processes into a practical treatment system can be very effective in reducing malodors from livestock wastewater.