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A Novel Bioreactor for High Density Cultivation of Diverse Microbial Communities

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Published on: December 25, 2015

Multi-chambers of pilot-scale reactor enhanced partial nitritation performance.

Kuo Zhang¹, Xinjue Li¹, Maofu Chen²

¹College of Environmental Sciences and Engineering, Department of Environmental Sciences and Engineering, Peking University, Beijing 100871, PR China.

The Science of the Total Environment

|March 16, 2023

Summary

This summary is machine-generated.

A novel four-chamber reactor significantly improved partial nitritation for wastewater treatment, achieving over 90% nitrite accumulation. This enhanced reactor design boosts nitrogen removal efficiency and stability, even under fluctuating loads.

Keywords:

Anammox Microbial community Multi-chambers Nitrite accumulation Partial nitritation

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Published on: October 7, 2020

Area of Science:

Environmental Engineering
Microbial Ecology

Background:

Partial nitritation is crucial for anammox-based wastewater treatment but is sensitive to ammonium concentration and loading rates.
High free ammonium concentrations can inhibit nitrite oxidizing bacteria, impacting overall nitrogen removal efficiency.
Conventional reactors struggle with stability under fluctuating nitrogen loads.

Purpose of the Study:

To investigate the performance of a novel, multi-chambered nitritation reactor for treating high-nitrogen wastewater.
To assess the impact of reactor compartmentalization on free ammonium concentration and microbial community distribution.
To evaluate the enhanced stability and nitrogen removal efficiency compared to conventional reactors.

Main Methods:

A pilot-scale nitritation reactor divided into four chambers was employed.
Measurements of nitrite accumulation, free ammonium concentration, and microbial populations (Nitrosomonas) were conducted.
The reactor's response to varying ammonium loading rates and dissolved oxygen levels was analyzed.

Main Results:

The novel reactor achieved over 90% nitrite accumulation efficiency.
Free ammonium concentration was effectively managed in the front chambers, reducing inhibition of nitrite oxidizing bacteria.
Nitrosomonas bacteria were highly enriched in the initial chambers, indicating efficient ammonium oxidation.
The multi-chambered reactor demonstrated enhanced resistance to volumetric shock loading, maintaining stable effluent quality.

Conclusions:

The multi-chambered reactor design effectively improves nitrite accumulation efficiency in partial nitritation.
This compartmentalized approach offers a promising strategy for enhancing anammox process performance in wastewater treatment.
The reactor's improved stability and efficiency provide a new perspective for single-reactor partial nitritation systems.