Enhancement of simultaneous nitrogen and phosphorus removal using intermittent aeration mechanism
| Autor: | Ahmed Eldyasti, Parnian Izadi, Parin Izadi |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
0106 biological sciences
Environmental Engineering Nitrogen Microorganism chemistry.chemical_element 010501 environmental sciences 01 natural sciences Waste Disposal Fluid Nutrient Bioreactors 010608 biotechnology Environmental Chemistry 0105 earth and related environmental sciences General Environmental Science Sewage Phosphorus General Medicine Microbial consortium Pulp and paper industry 6. Clean water Enhanced biological phosphorus removal chemistry Microbial population biology Environmental science Sewage treatment Aeration |
| Zdroj: | Journal of environmental sciences (China). 109 |
| ISSN: | 1001-0742 |
| Popis: | Biological nutrient removal grows into complicated scenario due to the microbial consortium shift and kinetic competition between phosphorus (P)-accumulating and nitrogen (N)-removing microorganisms. In this study, three sequential batch reactors with constant operational conditions except aeration patterns at 6 h cycle periods were tested. Intermittent aeration was applied to develop a robust nutrient removal system aimed to achieve high energy saving and removal efficiency. The results showed higher correspondence of P-uptake, polymeric substance synthesis and glycogen degradation in intermittent-aeration with longer interval periods compared to continuous-aeration. Increasing the intermittent-aeration duration from 25 to 50 min, resulted in higher process performance where the system exhibited approximately 30% higher nutrient removal. This study indicated that nutrient removal strongly depends on reaction phase configuration representing the importance of aeration pattern. The microbial community examined the variation in abundance of bacterial groups in suspended sludge, where the 50 min intermittent aeration, favored the growth of P-accumulating organisms and nitrogen removal microbial groups, indicating the complications related to nutrient removal systems. Successful intermittently aerated process with high capability of simple implementation to conventional systems by elemental retrofitting, is applicable for upgrading wastewater treatment plants. With aeration as a major operational cost, this process is a promising approach to potentially remove nutrients in high competence, in distinction to optimizing cost-efficacy of the system. |
| Databáze: | OpenAIRE |
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