Strong nitrogenous and agro-wastewater: current technological overview and future direction

Area of Science:

• Environmental Science
• Environmental Engineering
• Water Treatment Technologies

Background:

• Global nitrogen input has significantly increased over the past four decades.
• Animal farms and agro-industries are major sources of nitrogenous and organic waste.
• Effective treatment of this waste is crucial to prevent environmental pollution.

Purpose of the Study:

• To review and highlight effective methods for nitrogen removal from industrial and agricultural wastewater.
• To discuss the applicability of various biological and physico-chemical processes for treating nitrogen-rich effluents.
• To emphasize the importance of waste reuse and recycling for sustainable nitrogen management.

Main Methods:

• Review of biological processes including nitrification and denitrification.
• Evaluation of physico-chemical methods such as struvite precipitation and advanced oxidation processes.
• Assessment of membrane technologies like membrane bioreactors and reverse osmosis.

Main Results:

• Biological nitrification/denitrification and struvite precipitation are effective for strong nitrogenous waste.
• Advanced oxidation processes are superior to activated carbon for refractory organic removal in secondary treatment.
• Membrane bioreactors excel in solids separation, while reverse osmosis is efficient for water reuse.

Conclusions:

• Integrated approaches combining biological treatment with advanced technologies are effective for comprehensive wastewater management.
• Water reuse and recycling of nitrogenous wastes are essential for mitigating pollution and promoting resource recovery.
• Sustainable management of nitrogenous and organic pollution requires continuous innovation in treatment technologies.