Removal of N and P in a Rotating Biological Contactor Plant: Case Study Agnita, Romania
Abstract
:1. Introduction
2. Materials and Methods
- Daily average inflow: 2607 m3 (dry weather);
- Daily maximal inflow: 2971 m3 (35 L/s);
- Q max during rain: 540 m3/h (150 L/s);
Analysis
3. Results and Discussion
4. Conclusions
Supplementary Materials
Author Contributions
Funding
Data Availability Statement
Acknowledgments
Conflicts of Interest
References
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Inflow Concentration | Inflow Load | |||
---|---|---|---|---|
BOD | 220 | mg/L | 573 | kg/day |
COD | 440 | mg/L | 1147 | kg/day |
TSS | 256 | mg/L | 667 | kg/day |
TKN | 45 | mg/L | 118 | kg/day |
Total P | 9 | mg/L | 24 | kg/day |
Characteristic | Value | Characteristic | Value |
---|---|---|---|
Type of RBC | Modular | Disc diameter (mm) | 3000 |
Number of lines | 4 | Disc thickness (mm) | 1.5 |
Line volume (m3) | 58.87 | Distance between discs (mm) | 20 |
Number of modules per line | 2 | Disc material | HDPE |
Number of biodisc sets per module | 2 | Rotation speed (min−1) | 2 |
Number of individual discs per set | 103 (each of 10 sectors) | Water retention time (hours) | 2.17 |
Parameter | Analytical Standard or Method | Equipment | Maximal Permitted Limits mg/L |
---|---|---|---|
pH | SR ISO 10523/2012, PO-01 | WTW pH/Conductivity Multimeter model 330i with SENTIX® 41 electrode | 6.5–8.5 |
COD | SR ISO 6060/1996 | Velp eco 16 thermoreactor Merck Spectroquant® Multy Spectrophotometer | 125.0 |
BOD | SR EN ISO 5815-1/2020 Method WTW 997,230 OxiTop, PO-07 | WTW incubator model TS 606/2-i WTW OxiTop® bottles | 25.0 |
NH4+ | SR ISO 7150-1/2001 | WTW PhotoLab S6 Spectrophotometer | Not yet |
Total N | SR EN 25,663:2000 Method WTW Ntot TC LR 251995, PO-09 | WTW Thermoreactor CR 2200, Merck Spectroquant® Multy Spectrophotometer | 15.0 |
Total P | SR EN ISO 6878/2008 | WTW Thermoreactor CR 2200, Merck Spectroquant® Multy Spectrophotometer | Not yet |
TSS | SR EN 872/2009 | Classical filtration equipment | 35.0 |
Year | Inflow m3 | Total P, mg/L | Elimination Efficiency, % | |
---|---|---|---|---|
Influent | Effluent | |||
2016 | 419,271 | 5.83 | 3.52 | 39.62 |
2017 | 351,662 | 5.76 | 3.38 | 41.32 |
2018 | 382,011 | 4.48 | 2.09 | 53.35 |
2019 | 335,185 | 5.54 | 2.7 | 51.26 |
2020 | 253,793 | 6.65 | 2.72 | 59.10 |
2021 | 307,925 | 6.67 | 3.03 | 53.46 |
Parameter Sampling Place | 2021 | 2022 | ||
---|---|---|---|---|
NH4+ mg/L | Total N mg/L | NH4+ mg/L | Total N mg/L | |
Influent | 45.35 | 47 | 40.54 | 53.09 |
After primary settler | 33.2 | 39 | 35.22 | 46.08 |
Removal efficiency—primary settler | 26.79 | 17.02 | 13.12 | 13.20 |
After biodiscs | 5.01 | 13.50 | 3.80 | 15.00 |
Removal efficiency biodiscs | 84.91 | 65.38 | 89.21 | 67.45 |
After secondary settler | 4.16 | 10.79 | 2.38 | 11.75 |
Removal efficiency—secondary settler | 16.97 | 20.07 | 37.37 | 21.67 |
Total removal efficiency | 90.83 | 77.04 | 94.13 | 77.87 |
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Gaspar, E.; Munteanu, I.; Sintea, S. Removal of N and P in a Rotating Biological Contactor Plant: Case Study Agnita, Romania. Water 2022, 14, 3670. https://doi.org/10.3390/w14223670
Gaspar E, Munteanu I, Sintea S. Removal of N and P in a Rotating Biological Contactor Plant: Case Study Agnita, Romania. Water. 2022; 14(22):3670. https://doi.org/10.3390/w14223670
Chicago/Turabian StyleGaspar, Eniko, Ioan Munteanu, and Silviu Sintea. 2022. "Removal of N and P in a Rotating Biological Contactor Plant: Case Study Agnita, Romania" Water 14, no. 22: 3670. https://doi.org/10.3390/w14223670