Abstract
This study investigates the efficacy of floating treatment wetlands (FTWs) for retrofitting waste-stabilization ponds (WSPs) operating in cold continental climates, such that in Alberta, Canada. The objective was to determine whether WSPs augmented with FTWs could achieve equal or superior treatment efficiency at shorter hydraulic retention times (HRTs of 25–45 days) than those required in the conventional WSPs (60–365 days). A field study was carried out on treatment of domestic wastewater in a two-stage pilot-scale FTW mesocosm (i.e., FTW treatment train composed of Stage 1 and Stage 2 FTW cells (), with an overall volume of 84 and per cell). An identical system without FTW served as a control (i.e., control treatment train of ). Overall, the FTW-augmented WSP system achieved greater treatment of 5-day biochemical oxygen demand (), total suspended solids (TSS), total nitrogen (TN), ammonium nitrogen (), dissolved reactive phosphorus (DRP), and total phosphorus (TP) than the control. The corresponding removal efficiencies were 91.5% versus 85.0%, 91.3% versus 87.7%, 85.0% versus 75.6%, 93.9% versus 86.1%, 77.6% versus 57.7%, and 75.8% versus 58.7%, with a statistically significant difference () for all except TSS. This difference in performance resulted from the better performance of the Stage 1 FTW cell for , TN, and removal, and the Stage 2 FTW cell for DRP and TP removal. Simultaneous nitrification-denitrification (SND) occurred in the FTW treatment train, whereas only nitrification occurred in the control treatment train, which resulted in statistically higher TN removal efficiency in the former. Contribution of plant uptake to phosphorus removal was marginal (6.76%) and adsorption-desorption on solid particles was assumed to be the major removal pathway. The FTWs generally decreased the physicochemical parameters, with stronger effects on diurnal variations than seasonal fluctuations. The effect of FTW on daily physicochemical conditions played a key role in superior performance of FTW treatment.
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Data Availability Statement
All data, models, and code generated or used during the study appear in the published article.
Acknowledgments
This project was completed with the financial support of Environment Canada (through the Lake Winnipeg Basin Stewardship Fund), Source2Source, Natural Sciences and Engineering Research Council of Canada (NSERC), and Mitacs. Without the ongoing guidance and cosupervision of Dr. Jianxun He (University of Calgary) and Bernie Amell (Source2Source), this project could not achieve its goals and objectives. Technical support in the laboratory was provided by Daniel Larson and Mirsad Berbic, which was indispensable to the analysis. The authors would like to extend their gratitude to specific individuals who provided additional materials, labor, and guidance for this project, including Sadegh Hosseini (University of Calgary), Cecilia Chung, Wendell Koning, and Rob Wolfe (Alberta Environment and Parks), Dave Churchill and his staff (Wheatland County), Erik Vandist (Vita Water Technologies), Ray Shaw (Knutson and Shaw Growers), and Anton Skorobogatov (Source2Source).
References
ABMI (Alberta Biodiversity Monitoring Institute). 2019a. “Small fruited bulrush (Scirpus microcarpus).” Accessed June 1, 2020. https://abmi.ca/home/data-analytics/biobrowser-home/species-profile?tsn=99004233.
ABMI (Alberta Biodiversity Monitoring Institute). 2019b. “Water sedge (Carex aquatilis).” Accessed June 1, 2020. https://abmi.ca/home/data-analytics/biobrowser-home/species-profile?tsn=99004107.
Afzal, M., M. Arslan, J. A. Müller, G. Shabir, E. Islam, R. Tahseen, M. Anwar-ul-Haq, A. J. Hashmat, S. Iqbal, and Q. M. Khan. 2019. “Floating treatment wetlands as a suitable option for large-scale wastewater treatment.” Nat. Sustainability 2 (9): 863–871. https://doi.org/10.1038/s41893-019-0350-y.
Alberta Government. 2013. “Wastewater systems standards for performance and design, Standards and guidelines for municipal waterworks.” In Part 3 of Standards and guidelines for municipal waterworks, wastewater, and storm drainage systems. Edmonton, AB, Canada: Alberta Queen’s Printer.
Ali, H. Q., A. Farooq, and M. Ahmed. 2017. “Monitoring the wastewater treatment efficiency of oxidation ponds at Chokera, Faisalabad Hafiz.” Mehran Univ. Res. J. Eng. Technol. 36 (4): 987–994. https://doi.org/10.22581/muet1982.1704.23.
APHA (American Public Health Association). 2012. Standard methods for the examination of water and wastewater. 22nd ed. Washington, DC: APHA.
Banmann, C. L. 2016. The application of floating treatment wetlands for stabilization pond enhancement in southern Alberta. Alberta, Canada: Univ. of Calgary.
Barco, A., and M. Borin. 2017. “Treatment performance and macrophytes growth in a restored hybrid constructed wetland for municipal wastewater treatment.” Ecol. Eng. 107 (Oct): 160–171. https://doi.org/10.1016/j.ecoleng.2017.07.004.
Benvenuti, T., F. Hamerski, A. Giacobbo, A. M. Bernardes, J. Zoppas-Ferreira, and M. A. S. Rodrigues. 2018. “Constructed floating wetland for the treatment of domestic sewage: A real-scale study.” J. Environ. Chem. Eng. 6 (5): 5706–5711. https://doi.org/10.1016/j.jece.2018.08.067.
Borne, K. E. 2014. “Floating treatment wetland influences on the fate and removal performance of phosphorus in stormwater retention ponds.” Ecol. Eng. 69 (Aug): 76–82. https://doi.org/10.1016/j.ecoleng.2014.03.062.
Borne, K. E., E. A. Fassman, and C. C. Tanner. 2013. “Floating treatment wetland retrofit to improve stormwater pond performance for suspended solids, copper and zinc.” Ecol. Eng. 54 (May): 173–182. https://doi.org/10.1016/j.ecoleng.2013.01.031.
Borne, K. E., E. A. Fassman-Beck, and C. C. Tanner. 2014. “Floating treatment wetland influences on the fate of metals in road runoff retention ponds.” Water Res. 48 (Jan): 430–442. https://doi.org/10.1016/j.watres.2013.09.056.
Daughtry, C. S. T., C. L. Walthall, M. S. Kim, and E. B. Colstoun. 2000. “Estimating corn leaf chlorophyll concentration from leaf and canopy reflectance.” Remote Sens. Environ. 74 (2): 229–239. https://doi.org/https://doi.org/10.1016/S0034-4257(00)00113-9.
Davey, M. E., and G. A. O’Toole. 2000. “Microbial biofilms: From ecology to molecular genetics.” Microbiol. Mol. Biol. Rev. 64 (4): 847–867. https://doi.org/10.1128/MMBR.64.4.847-867.2000.
Environment Canada. 2016. “Daily data report for October 2016: Strathmore AGDM Alberta.” Accessed June 1, 2020. https://climate.weather.gc.ca/climate_data/daily_data_e.html?StationID=42725&timeframe=2&StartYear=1840&EndYear=2020&Day=7&Year=2016&Month=10#.
Garcia Chanc, L. M., S. C. Van Brunt, J. C. Majsztrik, and S. A. White. 2019. “Short- and long-term dynamics of nutrient removal in floating treatment wetlands.” Water Res. 159 (Aug): 153–163. https://doi.org/10.1016/j.watres.2019.05.012.
George, I., P. Crop, and P. Servais. 2002. “Fecal coliform removal in wastewater treatment plants studied by plate counts and enzymatic methods.” Water Res. 36 (10): 2607–2617. https://doi.org/10.1016/S0043-1354(01)00475-4.
Gottschall, N., C. Boutin, A. Crolla, C. Kinsley, and P. Champagne. 2007. “The role of plants in the removal of nutrients at a constructed wetland treating agricultural (dairy) wastewater, Ontario, Canada.” Ecol. Eng. 29 (2): 154–163. https://doi.org/10.1016/j.ecoleng.2006.06.004.
Hauser, A. S. 2006. “Carex aquatilis.” In Fire effects information system. Washington, DC: USDA.
Hayashi, M. 2004. “Temperature-electrical conductivity relation of water for environmental monitoring and geophysical data inversion.” Environ. Monit. Assess. 96 (1–3): 119–128. https://doi.org/10.1023/B:EMAS.0000031719.83065.68.
Headley, T. R., and C. C. Tanner. 2012. “Constructed wetlands with floating emergent macrophytes: An innovative stormwater treatment technology.” Crit. Rev. Environ. Sci. Technol. 42 (21): 2261–2310. https://doi.org/10.1080/10643389.2011.574108.
Ho, L. T., W. Van Echelpoel, and P. L. M. Goethals. 2017. “Design of waste stabilization pond systems: A review.” Water Res. 123 (Oct): 236–248. https://doi.org/10.1016/j.watres.2017.06.071.
Hubbard, R. K., G. J. Gascho, and G. L. Newton. 2004. “Use of floating vegetation to remove nutrients from swine lagoon wastewater.” Trans. Am. Soc. Agric. Eng. 47 (6): 1963–1972. https://doi.org/10.13031/2013.17809.
Kadlec, R. H., and S. D. Wallace. 2009. Treatment wetlands. 2nd ed. New York: CRC Press.
Keizer-Vlek, H. E., P. F. M. Verdonschot, R. C. M. Verdonschot, and D. Dekkers. 2014. “The contribution of plant uptake to nutrient removal by floating treatment wetlands.” Ecol. Eng. 73 (Dec): 684–690. https://doi.org/10.1016/j.ecoleng.2014.09.081.
Krause-Jensen, D., and K. Sand-Jensen. 1998. “Light attenuation and photosynthesis of aquatic plant communities.” Am. Socienty Limnol. Oceanogr. 43 (3): 396–407. https://doi.org/10.4319/lo.1998.43.3.0396.
Li, H., H. Hao, X. Yang, L. Xiang, F. Zhao, H. Jiang, and Z. He. 2012. “Purification of refinery wastewater by different perennial grasses growing in a floating bed.” J. Plant Nutr. 35 (1): 93–110. https://doi.org/10.1080/01904167.2012.631670.
Lv, H., D. Liu, Y. Zhang, D. Yuan, F. Wang, J. Yang, X. Wu, W. Zhang, and X. Dai. 2019. “Effects of temperature variation on wastewater sludge electro-dewatering.” J. Cleaner Prod. 214 (Mar): 873–880. https://doi.org/10.1016/j.jclepro.2019.01.033.
Maucieri, C., A. Mietto, A. C. Barbera, and M. Borin. 2016. “Treatment performance and greenhouse gas emission of a pilot hybrid constructed wetland system treating digestate liquid fraction.” Ecol. Eng. 94 (Sep): 406–417. https://doi.org/10.1016/j.ecoleng.2016.05.062.
Metcalf & Eddy. 2014. Wastewater engineering: Treatment and recourse recovery. 5th ed. Edited by George Tchobanoglous, H. D. Stensel, R. Tsuchihashi, and F. L. Burton. New York: Metcalf & Eddy.
Mietto, A., M. Borin, M. Salvato, P. Ronco, and N. Tadiello. 2013. “Tech-IA floating system introduced in urban wastewater treatment plants in the Veneto region—Italy.” Water Sci. Technol. 68 (5): 1144–1150. https://doi.org/10.2166/wst.2013.357.
Muñoz, R., and B. Guieysse. 2006. “Algal-bacterial processes for the treatment of hazardous contaminants: A review.” Water Res. 40 (15): 2799–2815. https://doi.org/10.1016/j.watres.2006.06.011.
Neori, A. 2000. “Bioactive chemicals and biological-biochemical activities and their functions in rhizospheres of wetland plants.” Bot. Rev. 66 (3): 350–378. https://doi.org/10.1007/BF02868922.
Neumann, G., and V. Römheld. 1999. “Root excretion of carboxylic acids and protons in phosphorus-deficient plants.” Plant Soil 211 (1): 121–130. https://doi.org/10.1023/A:1004380832118.
Park, J. B. K., J. P. S. Sukias, and C. C. Tanner. 2019. “Floating treatment wetlands supplemented with aeration and biofilm attachment surfaces for efficient domestic wastewater treatment.” Ecol. Eng. 139 (Nov): 105582. https://doi.org/10.1016/j.ecoleng.2019.105582.
Pavlineri, N., N. T. Skoulikidis, and V. A. Tsihrintzis. 2017. “Constructed floating wetlands: A review of research, design, operation and management aspects, and data meta-analysis.” Chem. Eng. J. 308 (Jan): 1120–1132. https://doi.org/10.1016/j.cej.2016.09.140.
Pishgar, R., J. Lee, J. A. Dominic, S. Hosseini, J. H. Tay, and A. Chu. 2020. “Augmentation of biogranules for enhanced performance of full-scale lagoon-based municipal wastewater treatment plants.” Appl. Biochem. Biotechnol. 2020 (Mar): 1–18. https://doi.org/10.1007/s12010-020-03256-3.
Price, D. S., D. W. Smith, and S. J. Stanley. 1995. “Performance of lagoons experiencing seasonal ice cover.” Water Environ. Res. 67 (3): 318–326. https://doi.org/10.2175/106143095X131538.
Sawyer, C. N., P. L. McCarty, and G. F. Parkin. 1994. Chemistry for environmental engineering. 4th ed. New York: McGraw-Hill.
Schwammberger, P. F., T. Lucke, C. Walker, and S. J. Trueman. 2019. “Nutrient uptake by constructed floating wetland plants during the construction phase of an urban residential development.” Sci. Total Environ. 677 (Aug): 390–403. https://doi.org/10.1016/j.scitotenv.2019.04.341.
Schwammberger, P. F., C. M. Yule, and N. W. Tindale. 2020. “Rapid plant responses following relocation of a constructed floating wetland from a construction site into an urban stormwater retention pond.” Sci. Total Environ. 699 (Jan): 134372. https://doi.org/10.1016/j.scitotenv.2019.134372.
Shilton, A., and J. Harrison. 2003. “Development of guidelines for improved hydraulic design of waste stabilisation ponds.” Water Sci. Technol. 48 (2): 173–180. https://doi.org/10.2166/wst.2003.0114.
Spangler, J. T., D. J. Sample, L. J. Fox, J. P. Albano, and S. A. White. 2019a. “Assessing nitrogen and phosphorus removal potential of five plant species in floating treatment wetlands receiving simulated nursery runoff.” Environ. Sci. Pollut. Res. 26 (6): 5751–5768. https://doi.org/10.1007/s11356-018-3964-0.
Spangler, J. T., D. J. Sample, L. J. Fox, J. S. Owen, and S. A. White. 2019b. “Floating treatment wetland aided nutrient removal from agricultural runoff using two wetland species.” Ecol. Eng. 127 (Feb): 468–479. https://doi.org/10.1016/j.ecoleng.2018.12.017.
Tanner, C. C., and T. R. Headley. 2011. “Components of floating emergent macrophyte treatment wetlands influencing removal of stormwater pollutants.” Ecol. Eng. 37 (3): 474–486. https://doi.org/10.1016/j.ecoleng.2010.12.012.
Van De Moortel, A. M. K., E. Meers, N. De Pauw, and F. M. G. Tack. 2010. “Effects of vegetation, season and temperature on the removal of pollutants in experimental floating treatment wetlands.” Water Air Soil Pollut. 212 (1–4): 281–297. https://doi.org/10.1007/s11270-010-0342-z.
Verdejo, A., M. D. Curt, and J. Fernández. 2015. “Effects of supplemental aeration on total nitrogen removal in a floating helophytes filter (FHF) for wastewater treatment.” Pol. J. Environ. Stud. 24 (1): 307–316.
Werker, A. G., J. M. Dougherty, J. L. Mchenry, and W. A. Van Loon. 2002. “Treatment variability for wetland wastewater treatment design in cold climates.” Ecol. Eng. 19 (1): 1–11. https://doi.org/10.1016/S0925-8574(02)00016-2.
White, S. A., and M. M. Cousins. 2013. “Floating treatment wetland aided remediation of nitrogen and phosphorus from simulated stormwater runoff.” Ecol. Eng. 61 (Dec): 207–215. https://doi.org/10.1016/j.ecoleng.2013.09.020.
Winston, R. J., W. F. Hunt, S. G. Kennedy, L. S. Merriman, J. Chandler, and D. Brown. 2013. “Evaluation of floating treatment wetlands as retrofits to existing stormwater retention ponds.” Ecol. Eng. 54 (May): 254–265. https://doi.org/10.1016/j.ecoleng.2013.01.023.
Yang, Z., S. Zheng, J. Chen, and M. Sun. 2008. “Purification of nitrate-rich agricultural runoff by a hydroponic system.” Bioresour. Technol. 99 (17): 8049–8053. https://doi.org/10.1016/j.biortech.2008.03.040.
Zhai, X., N. Piwpuan, C. A. Arias, T. Headley, and H. Brix. 2013. “Can root exudates from emergent wetland plants fuel denitrification in subsurface flow constructed wetland systems?” Ecol. Eng. 61 (Dec): 555–563. https://doi.org/10.1016/j.ecoleng.2013.02.014.
Zhou, X., and G. Wang. 2010. “Nutrient concentration variations during Oenanthe javanica growth and decay in the ecological floating bed system.” J. Environ. Sci. 22 (11): 1710–1717. https://doi.org/10.1016/S1001-0742(09)60310-7.
Zhou, X. H., G. X. Wang, and F. Yang. 2012. “Nitrogen removal from eutrophic river waters by using Rumex acetosa cultivated in ecological floating beds.” Fresenius Environ. Bull. 21 (7): 1920–1982.
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Received: Sep 22, 2020
Accepted: Dec 18, 2020
Published online: Mar 19, 2021
Published in print: Jun 1, 2021
Discussion open until: Aug 19, 2021
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