Related Experiment Video
Updated: May 23, 2026
07:59
Estimating Sediment Denitrification Rates Using Cores and N2O Microsensors
Published on: December 6, 2018
[Control for MUCT process operation using nitrate concentration in the secondary anoxic zone].
Xiao-Ling Wang1, Jun Yin, Shang Gao
1School of Municipal and Environmental Engineering, Jilin Architectural and Civil Engineering Institute, Changchun 130021, China. smile_gyb@sina.com
Huan Jing Ke Xue= Huanjing Kexue
|March 29, 2012
Summary
Controlling nitrate concentration in the secondary anoxic zone is key for optimal nitrogen and phosphorus removal in the MUCT process. Maintaining nitrate levels at 2.5 mg/L ensures efficient nutrient reduction.
Area of Science:
- Environmental Engineering
- Wastewater Treatment Technologies
- Nutrient Removal Processes
Context:
- The study investigates the control of the Multi-stage Conventional Treatment (MUCT) process for enhanced nutrient removal.
- Simulated domestic sewage with controlled influent concentrations of Chemical Oxygen Demand (COD), Total Nitrogen (TN), and Total Phosphorus (TP) was utilized.
- Influent COD was maintained at (290 ± 10) mg/L, TN at (55 ± 0.5) mg/L, and TP at (7.0 ± 0.5) mg/L.
Purpose:
- To evaluate the feasibility of controlling MUCT process operation based on nitrate concentration in the secondary anoxic zone.
- To determine the optimal nitrate concentration for simultaneous nitrogen and phosphorus removal.
- To analyze the impact of nitrate concentration on phosphorus release, uptake, and denitrification.
Summary:
- Effluent Total Nitrogen (TN) and Total Phosphorus (TP) concentrations were significantly influenced by the nitrate concentration in the secondary anoxic zone (S(NO3-)).
- Optimal control for nitrogen and phosphorus removal was achieved by maintaining S(NO3-) at 2.5 mg/L.
- Mass balance analysis confirmed S(NO3-) as a critical factor influencing phosphorus dynamics and denitrification efficiency within the MUCT system.
Impact:
- Provides a key operational parameter for optimizing MUCT process performance.
- Offers a cost-effective strategy for enhanced nutrient removal in wastewater treatment.
- Contributes to a better understanding of the interplay between nitrogen and phosphorus removal mechanisms in biological treatment systems.
More Related Videos
Related Concept Videos
01:202° Amines to N-Nitrosamines: Reaction with NaNO2
Secondary amines react with nitrous acid to form N-nitrosamines, as depicted in Figure 1. Nitrous acid, a weak and unstable acid, is formed in situ from an aqueous solution of sodium nitrite and strong acids, such as hydrochloric acid or sulfuric acid, in cold conditions. In the presence of an acid, the nitrous acid gets protonated. The subsequent loss of water results in the formation of the electrophile known as nitrosonium ion.
01:18Bioreactor Controls-II
In aerobic fermentations, oxygen is vital for microbial growth and metabolite production. Since air comprises only about 20% oxygen and the gas is poorly soluble in water—just 9 ppm at 20°C—supplying sufficient oxygen becomes a critical challenge, especially in high-demand processes like yeast growth or citric acid production. Even a fully saturated broth may offer only a few seconds of oxygen availability.To address this, sterile or scrubbed air is introduced into the fermentor via a sparger...
01:15Metabolism of Chemolithotrophs
Chemolithotrophs are microorganisms that obtain energy by oxidizing inorganic molecules such as hydrogen gas (H₂), ammonia (NH₃), reduced sulfur compounds (H₂S, S²⁻), and ferrous iron (Fe²⁺). Unlike heterotrophic organisms that rely on organic carbon, chemolithotrophs transfer electrons from these inorganic donors to the electron transport chain (ETC), generating a proton motive force (PMF) that drives ATP synthesis through oxidative phosphorylation. However, because inorganic electron donors...
01:28Bioreactor Controls-I
Maintaining optimal conditions within fermenters is essential for maximizing microbial productivity and ensuring process efficiency. This lesson focuses on key parameters—temperature, foam, pH, carbon dioxide, oxygen, and pressure—and their precise measurement and control strategies in fermentation systems.Temperature ControlTemperature regulation is critical due to the exothermic nature of many fermentation processes. In small laboratory fermenters, temperature is commonly monitored using...
01:25Microbial Mats
Microbial communities forming biofilms and mats represent complex, spatially structured ecosystems where metabolic processes are stratified according to light, oxygen, and nutrient gradients. Biofilms are initial colonization stages, only a few millimeters thick, while mature microbial mats can reach centimeter-scale thickness and display intricate vertical organization. Their structural and functional heterogeneity allows microorganisms to occupy distinct ecological niches within a few...