Parameter-efficient bioclogging model: calibration and comparison with laboratory data
- 102 Downloads
A parameter-efficient bioclogging model coupled with hydrodynamics was developed with a stepwise numerical calculation. Column lab tests were carried out to calibrate and verify the bioclogging model developed in this paper. The results showed that the experimental data fit well with the simulation data, which indicated that the developed model was reasonable. According to the sensitivity analysis of the parameters, the BOD (biochemical oxygen demand) loading rate and deposition coefficient are the key parameters for bioclogging. The results illustrate how the clogging is impacted by changing the BOD loading rate and can predict the biofilm accumulation within the substrate, the microbial saturation along the substrate profile over time, and the biofilter longevity based on the biomass growth. The model could dynamically describe the entire process of biological clogging and could quantitatively predict the amount of biofilm accumulated in the pores with the increasing operation time, which provides a basis for the prediction of biological clogging.
KeywordsVertical flow constructed wetland Bioclogging Parameter-efficient model
This study was financially supported by the Natural Science Foundation of China (51509070) and the Fundamental Research Funds for the Central Universities (2018B11614).
- Caselles-Osorio A, Porta A, Porras M, García J (2007) Effect of high organic loading rates of particulate and dissolved organic matter on the efficiency of shallow experimental horizontal subsurface-flow constructed wetlands. Water Air Soil Pollut 183(1–4):367–375Google Scholar
- EPA of China (1989) The methods for water and wastewater monitoring & analysis, third edn. Environmental Technolge & Science Press of China, Peking, p 254Google Scholar
- Pedescoll A, Knowles PR, Davies P, García J, Puigagut J (2012) A comparison of in situ constant and falling head permeameter tests to assess the distribution of clogging within horizontal subsurface flow constructed wetlands. Water Air Soil. Pollut 223(5):2263–2275Google Scholar
- Saeed T, Sun G (2017) Pollutant removals employing unsaturated and partially saturated vertical flow wetlands: a comparative study. Chem Eng J 325:332–341Google Scholar
- Shao C, Zhou Z, Li J (2017) Wu, J. Biological clogging model based on biological filter packed with glass beads. Chin. J. Environ Eng 11(10):5368–5374Google Scholar
- Taylor SW, Milly PDC, Jaffé PR (1990) Biofilm growth and the related changes in the physical properties of a porous medium. Water Resour Res 26(9):1261–2169Google Scholar
- The Professional Standards Compilation Group of People’s Republic of China (1999) In: Standard for soil test method (GB/T50123-1999). China Planning Press, Beijing, pp 68–74Google Scholar
- Weintraub L, Chen CW, Tsai W, Herr J, Goldstein RA, Siegrist R (2002) Modifications of WARMF to assess the efficacy of onsite wastewater systems on public health. Water Environ Fed 2002(10):152–165Google Scholar