Advantages

Disadvantages

Lower dosage of phosphorus required as a growth factor for anaerobic bacteria

Heavy metals can prevent digestion

Lower excess sludge production

Ammonia toxicity

Lower energy usage

Sensitive to changes in temperature and pH, as well as various toxic substances existing in influent of the reactor or byproducts produced in the reactor

Useable biogas production

Removal of more than 90% of BOD

Higher organic loading rates

Remain high concentration of ammonia in effluent

Lower operating costs

Long time for start up