Prediction and quantification of bioclogging depth limit and rate based on numerical simulation and experimental validation in managed aquifer recharge
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Abstract Many microorganisms are naturally occurring in both recharging water and porous media, and microorganisms will grow and clog the pores of porous media. Porous media show different clogging depth and rate, which depends on the carbon source concentration. The bioclogging depth limit and rate under the effect of the nutrient concentration can be disentangled through column experiments and numerical simulation approaches. We use the TOUGHREACT method‐based on the monod equation of microbial growth to explore the process of microbial growth and permeability change, and correct with experimental results. The experimental results show the influence of nutrient concentration (glucose) on microbial growth and clogging of porous medium, and leads to clogging of porous medium. The clogging rate was defined as the rate of change of hydraulic conductivity with time for quantitative study of bioclogging in our study. Simulated results found that the clogging rate increases 0.035 and 0.00673 (m/d/min) respectively in the glucose concentration range of 0.045–0.6 and 0.6–5 mmol/L, simultaneously, the ultimate clogging depth decreases 18.2 and 1.7 mm respectively in the glucose concentration range of 0.045–0.6 and 0.6–5 mmol/L. The aim of this study was to evaluate the effects of nutrient concentrations on bioclogging and shed light on the establishment of nutrient concentration standards for recharge water during groundwater artificial recharge.Keywords:
Clogging
Infiltration (HVAC)
Permeameter
Clogging
Subsurface Flow
Ditch
Constructed wetland
Hydraulic head
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The effect of infiltration rate on biological clogging and water quality changes is investigated experimentally using a sand column. The concentration of soluble COD in the effluent is stable during 3 months of infiltration, and the lower the initial infiltration rate is, the higher the average percentage of the reduction of soluble COD becomes. The soluble COD is primarily removed in the surface layer. The hydraulic conductivity in the bottom layer decreases at the highest infiltration rate. The variation of infiltration rate is divided into four stages. In addition, the biological‐clogging model is proposed, and the mechanism of biological clogging is discussed.
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The artificial recharge through artesian well is one of the direct method. The troubling problem in this method is clogging of the recharge well or adjacent aquifer materials.Writers have experienced that clogging chiefly has been attributed to the different chemical characteristic of both the native ground water and the reharge water and air in the recharge water, through the testing work carried out by the group of investigation of the Geological Survey of Japan. The clogging because of them occured temporarily and its agent was adequately removed by intermittent pumping and recharging of the recharge well. But it would seem that the permanent decreasing of permeability of adjacent aquifer occurred as a result of the repeated pumping.Therefore, the preliminary evaluation necessitates the consideration of adequacy of the recharge water to the native ground water.
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