Journal
BIORESOURCE TECHNOLOGY
Volume 357, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2022.127349
Keywords
Free ammonia nitrogen; Substrate dilution; Buffer system; Syntrophic bacteria; Anaerobic treatment
Funding
- China Scholarship Council
Ask authors/readers for more resources
This study investigated the treatment of protein-rich dairy product wastewater in an anaerobic membrane bioreactor. The results showed that substrate dilution is essential in overcoming ammonia inhibition. Moreover, ammonia inhibition resulted in changes in the relative abundance of certain bacteria in the wastewater.
Dairy product wastewater contains high-strength organic matter suitable for anaerobic treatment, but excessive protein degradation may lead to an ammonia inhibition problem. This work studied protein-rich dairy product wastewater treatment in the anaerobic membrane bioreactor. The results showed that a temporary self detoxification phase of ammonia inhibition from the change of pH buffer system was vital for rapid reactor recovery by substrate dilution. The ammonia washout from the reactor was simulated by a kinetic model. After ammonia inhibition, the relative abundance of syntrophic lactic and propionic acids oxidising bacteria significantly reduced along with fermentative bacteria involved in mixed organic acids production. Nevertheless, the relative abundance of the protein degradation bacteria producing acetic acid and H-2/CO2 increased. A potential metabolic process change was proposed by profiling the functional community. To conclude, substrate dilution is essential for overcoming ammonia inhibition in the anaerobic treatment of protein-rich dairy product wastewater.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available