Long-term leaching behavior of phenol in cement/activated-carbon solidified/stabilized hazardous waste

Liu, Jianguo; Nie, Xiaoqin; Zeng, Xianwei; Su, Zhaoji

doi:10.1016/j.jenvman.2012.11.026

Cited by 15 publications

(7 citation statements)

References 23 publications

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“…Liu et al 11 investigated the law of oxidative aging of HDPE and the main influencing factors through experiments, and then developed a method for calculation of the half-life of HDPE on this basis. Other studies investigated the long-term effects of solidified materials on solidifying and stabilizing harmful ingredients in solid waste (leachate) 13 .…”

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confidence: 99%

Framework, method and case study for the calculation of end of life for HWL and parameter sensitivity analysis

Xiang

Liu

et al. 2020

Sci Rep

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Mass construction and operation of hazardous waste landfill infrastructure has greatly improved China’s waste management and environmental safety. However, the deterioration of engineering materials and the failure of landfill may lead to the release of untreated leachate rich in persistent toxic pollutants to the soil and shallow groundwater. Accordingly, we develop the framework and process model to predict landfill life by coupling the landfill hydrological performance model and material degradation model. We found that the decrease rate of the concentration of persistent pollutants in leachate was significantly slower than the deterioration rate of the landfill engineering materials. As a result, when the materials failed, the leachate with high concentrations of persistent pollutants continued to leak, resulting in the pollutants concentration in surrounding groundwater exceeding the acceptable concentration at around 385 a, which is the average life of a landfill. Further simulation indicated that hydrogeological conditions and the initial concentration of leachate will affect landfill lifespan. The correlation coefficients of concentration, the thickness of vadose zone and the thickness of aquifer are − 0.79, 0.99 and 0.72 respectively, so the thickness of vadose zone having the greatest impact on the life of a landfill. The results presented herein indicate hazardous waste landfill infrastructure reinvestment should be directed toward long-term monitoring and maintenance, waste second-disposal, and site restoration.

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confidence: 99%

Framework, method and case study for the calculation of end of life for HWL and parameter sensitivity analysis

Xiang

Liu

et al. 2020

Sci Rep

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“…Several studies evaluated the leaching behaviour of waste under acid leachant (Baba et al, 2008;Cruz Payán et al, 2012;Hartley et al, 2004;Liu et al, 2013). In the present research acid conditions were assessed performing the column leaching test by using acidified demineralised water as leaching agent.…”

Section: Column Leaching Tests Assessing Ambient Conditionsmentioning

confidence: 96%

“…Temperature and mechanical constraints were studied following the indications of the European Council (2002). Even if the landfill body is mostly characterized by alkaline environment, acid conditions were studied ad absurdum as a critical aspect that can accelerate the elution process (Du et al, 2012;Liu et al, 2013).…”

Section: Column Leaching Tests Assessing Ambient Conditionsmentioning

confidence: 99%

“…Several researches have been performed on various waste categories aim to study the leaching behaviour by means of batch and column tests: stabilised/solidified waste (Barna et al, 1997;De Windt et al, 2007;Liu et al, 2013;Malviya and Chaudhary, 2006;Poon et al, 2001), mining waste (Al-Abed et al, 2008;Turner et al, 2009), construction and demolition waste (Butera et al, 2014;Butera et al, 2015;Delay et al, 2007;Lopez Meza et al, 2008;Nielsen et al, 2006;Roussat et al, 2008), contaminated soils (Cruz Payán et al, 2012;Gardner et al, 2007;Hartley et al, 2004), fly-ash stabilised soils (Bin-Shafique et al, 2006), soils used in construction works (Quaghebeur et al, 2006). To our knowledge, the leaching behaviour of WHPS and its alteration to foreseeable landfill conditions has not yet been studied.…”

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confidence: 99%

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Leaching behaviour of hazardous waste under the impact of different ambient conditions

et al. 2017

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The overall objective of this study is to provide an improved basis for the assessment of the leaching behaviour of waste marked as hazardous partly stabilised (European waste catalogue code 19 03 04). Four samples of hazardous partly stabilised waste were subjected to two leaching tests: up-flow column tests and batch equilibrium tests. The research was carried out in two directions: the first aims at comparing the results of the two experimental setups while the second aims at assessing the impact of different ambient conditions on the leaching behaviour of waste. Concerning this latter objective the effect of mesophilic temperature, mechanical constraints and acid environment were tested through column percolation tests. Results showed no significant differences between batch and column leaching test outcomes when comparing average concentrations calculated at a liquid to solid ratio of 10:1 l kg TS. Among the tested ambient conditions, the presence of an acid environment (pH=4.5) accelerated the leaching process resulting in a higher cumulative released quantity measured on the majority of the investigated polluting substances. On the contrary, the effect of temperature and mechanical constraints seemed to not affect the process showing final contents even lower than values found for the standard test. This result was furthermore confirmed by the application of the principal component analysis.

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“…Toxicity characteristic leaching procedure (TCLP) test showed that the increase in MC and cement reduces cresol leaching and enhances the method's performance up to 70%. Liu et al 7 investigated the long-term leaching behavior of phenol in S/S hazardous wastes with different amounts of cement and activated carbon. They showed that phenol was better stabilized, its leaching ratio was decreased by adding activated carbon in cement-based S/S of phenol-containing hazardous waste, and the pore volume and specific surface area of the S/S products were increased.…”

Section: Introductionmentioning

confidence: 99%

Enhancement of the quick lime‐based solidification/stabilization of oily wastes using modified clay

Jebeli

Heidarzadeh

2021

J of Chemical Tech & Biotech

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BACKGROUND: This research investigated the solidification/stabilization process (S/S) efficiency of contaminated soil by total petroleum hydrocarbons (TPH) in the waste of a used oil treatment plant using quick lime (QL) as a binder and modified clay (MC) as an additive. Several objectives were considered, including reducing the mobility and leaching of TPH, investigating the effect of MC on the QL hydration process in the presence of organic matter, the possibility of S/S waste reuse, and estimating the S/S cost for the optimum mixture. RESULTS:The unconfined compressive strength (UCS) increased about 45% by increasing 25% of QL without MC, but these S/S wastes did not satisfy the waste reuse standards. Additionally, adding any ratio of MC to samples containing QL increased UCS significantly. The UCS of all samples at the age of 28 days with different QL and MC proportions obtained more than 350 kPa (the minimum UCS required for S/S waste disposal in the landfill). Moreover, the toxicity characteristic leaching procedure (TCLP) test revealed that TPH leaching of contaminated soil was 3.8 mg L −1 but adding only 15% of QL could reduce TPH leaching to less than 1 mg L −1 , which is the maximum allowable TPH leaching.CONCLUSION: The combination of QL and MC decreased TPH leaching, significantly. The scanning electron microscopy analysis also showed that QL hydration was improved by increasing the amount of MC. Finally, a sample with 35% QL and 15% MC was selected as an optimum sample due to its cost of $80.5/ton.

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Long-term leaching behavior of phenol in cement/activated-carbon solidified/stabilized hazardous waste

Cited by 15 publications

References 23 publications

Framework, method and case study for the calculation of end of life for HWL and parameter sensitivity analysis

Framework, method and case study for the calculation of end of life for HWL and parameter sensitivity analysis

Leaching behaviour of hazardous waste under the impact of different ambient conditions

Enhancement of the quick lime‐based solidification/stabilization of oily wastes using modified clay

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