Rui Hu's research while affiliated with Hohai University and other places

... A joint probability distribution is then used to describe the likelihood of a specific realization occurring. Because geological deposition processes may lead to spatial correlations between parameters at different locations, the joint probability distribution needs to consider an autocorrelation function, along with mean and variance [44,45]. ...

... Additional head or pressure signals can be included either sequentially or simultaneously. The travel time inversion and the geostatistical inversion as implemented by SimSLE are compared by Qiu et al. (2023) for a heterogeneous synthetic test case. We refer to the respective references for further inversion algorithms, i.e., to Cardiff and Barrash (2011), Kitanidis (1995), and Tiedeman and Barrash (2020) The parameter vector can be updated at specific time steps using techniques such as Kalman filtering (Dodangeh et al., 2023;Panzeri et al., 2013) or history matching (White, 2018) when new data is obtained. ...

... Rockfill dams exhibit excellent adaptability to various foundations and are widely used in areas with deep overburden. However, the complex geological and topographical conditions in these areas, combined with uncertainties in the materials used to build rockfill dams, have resulted in failures like cracking [8,9] and seepage [10,11] during construction and operation. These issues have hindered the development of high earth-rock dams and increased safety risks [12]. ...

... It may take many different forms, such as composite iron matrix, iron fillings, iron nails, steel wool, sponge iron or cleaned scrap iron (Wenk et al., 2014). Each of these materials offers advantages for the intended application and they are also widely available and affordable (Hu et al., 2019;Makota et al., 2017). The type of iron material used, the physicochemical properties of the water, the starting arsenic concentration, and the arsenic speciation all affect how effective zero valent iron is at removing arsenic from the water (Biterna et al., 2010). ...

... However, most previous works studying contaminant removal in Fe 0 -H 2 O systems were conducted under intensive mixing conditions (i.e., via well-mixed batch experiments), which result in mechanical abrasion of the surfaces and disturbance of (hydr)oxide film formation at the surface of Fe 0 [21-40]; therefore, they will not be taken into further consideration in the present study, since they may report overestimated removal efficiencies of contaminants. As suggested by recent works [41,42], only non-disturbed (or very slowly) shaken batch experiments are appropriate for the investigation of contaminant removal in Fe 0 -H 2 O systems; unfortunately, as far as we know, there are no studies regarding anionic contaminant removal in Fe 0 -H 2 O systems conducted under such experimental conditions. ...

... Although there are examples of a good longevity of this reactive medium in full scale (Wilkin et al., 2014), there are numerous cases when a significant reduction of the barrier permeability occurred (Henderson and Demond, 2007). This phenomenon is mainly caused by the formation of iron oxides and hydroxides which, due to their expansive nature, reduce the porosity and permeability of the barrier (Cao et al., 2021;Hu et al., 2018). Mixing ZVI with another granular medium is a well-established strategy to prevent permeability reduction (Bilardi et al., 2020;Hu et al., 2020;Moraci et al., 2017Moraci et al., , 2015Ruhl et al., 2014). ...

... Moreover, if a reactivity database of iron nails is made available, Fe 0 material selection criteria for specific water types (e.g., carbonate-rich) can be developed. Finally, the non-linear kinetics of long-term iron corrosion should be taken into consideration in the design process [79][80][81]84,85]. However, Banerji and Chaudhari [5] have also propagated the thinking mistake that As III is oxidized to As V prior to removal. ...

... Fluoride (F − ) is an essential ion for humans to maintain the health of bones and teeth within the concentration range of 0.5-1.0 mg L −1 , but long-term exposure to concentrated F − may lead to serious diseases, such as pneumonia, dental fluorosis and bone cancer (Aoba and Fejerskov, 2002;Heimann et al., 2018;Mahoney et al., 1991;Wing et al., 1991). The major anthropogenic source of concentrated F − is the discharge of Science of the Total Environment 838 (2022) 156336 industrial wastewater from semiconductor manufacture, metallurgy, chemical fertilizer and organic fluorine chemical production (Aldaco et al., 2007;Aoudj et al., 2017;Chang and Liu, 2007;Won et al., 2012). ...

... 14 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 The results depict very limited water defluoridation (E < 20 %). This corroborates recent results by [66][67][68]. Knowing the less efficiency of GI for Fremoval, the experiments were designed to investigate whether filamentous SW can perform better. The order of reactivity based on the mean values in Figure 6a enables the following order of reactivity: SW8 (non reactive) < SW7 < SW6 < SW3 < SW4 < SW5 < SW2 < SW1 It is surprising that SW1, representative for the "low reactive" materials exhibited the highest removal performance. ...

... One of the proposals found in the literature is the construction of very affordable iron-based water filters that have good adsorption capacity [136]. The need for periodic replacement of these filters is a common barrier to adopting this technology, but there are already proposals for devices that encourage the user to change them after the specified service life [137]. The results reported by Soto-Gómez et al. [138] suggest that cuttlefish ink is an inexpensive substitute suitable for exploiting the transport of contaminants into groundwater and could be used to develop affordable water filtration systems. ...