Leaching behavior of estuarine sediments and cement-stabilized sediments in upland management environments

Gardner, Kevin H.; Tsiatsios, Christopher J.; Melton, Jeffrey S.; Seager, Thomas P.

doi:10.1016/j.wasman.2006.09.002

Cited by 19 publications

(7 citation statements)

References 16 publications

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“…Detailed description of this model is reported elsewhere (Kinniburgh et al 1999). If compared with the widely used Gaussian model for DOC behavior description (Birceanu et al 2008;Buerge-Weirich and Sulzberger 2004;Dean et al 2005;Gardner et al 2007;Hesterberg et al 2006), the NICA-Donnan model provide a more realistic assessment of metalhumic complexation and has been shown in several studies to be a versatile model capable of describing observed humic ion-binding behavior well over a wide range of conditions (Christensen et al 1998;Pinheiro et al 1999). Based on the research of Bryan et al (2002) it is assumed that 70% of the organic matter is active with respect to proton and metal binding, with a mean conversion for DOM to DOC of 1.4.…”

Section: Phosphorus Speciationmentioning

confidence: 99%

Speciation and Transport of Phosphorus in Source Area Rainfall–Runoff

Berretta

Sansalone

2011

Water Air Soil Pollut

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Phosphorus (P) delivered by urban rainfall-runoff partitions and speciates during the transport process. This study examines transport and speciation of P in rainfall and runoff across 15 wet weather events from a paved source area dominated by biogenic loads and to a lesser degree, anthropogenic loads. The mean and median event-based source area total phosphorus is 3.6 and 3.5 mg/l, respectively. The mean and median event-based source area dissolved fraction (f d ) are 0.31 and 0.32 illustrating that P is predominately bound to particulate matter fractions. The majority of events across the monitoring campaign produce a weak mass-limited transport of dissolved phosphorus (DP). With respect to the DP fraction in runoff (pH range of 6.4 to 8.6), the dominant species are orthophosphates (HPO 4 −2 and H 2 PO 4 − ) which account for more than 90% of DP mass. The order of species predominance is consistently HPO 4 −2 ≈H 2 PO 4 − >>CaHPO 4 >MgHPO 4 . With rainfall pH ranging from 4.2 to 4.9 and a f d ≈1.0, H 2 PO 4 − accounts for 95% to 99% of DP in rainfall.Despite the inherent variability of a large dataset (362 samples across 15 events) the speciation of DP is influenced primarily by pH, with a range from 4.2 (rainfall) up to 8.6 (runoff) that results in an order of magnitude change in P species concentration and determines the order between the dominant orthophosphate species. For this source area, the role of alkalinity, dissolved organic carbon and partitioning on DP speciation are minor compared to the influence of pH.

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Section: Phosphorus Speciationmentioning

confidence: 99%

Speciation and Transport of Phosphorus in Source Area Rainfall–Runoff

Berretta

Sansalone

2011

Water Air Soil Pollut

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“…Few studies have been conducted on the substitution of sand by dredged sediments in cemented mortars for civilian engineering use (Dubois et al, 2011), as most studies deal with a simple stabilization-solidification process (Chen et al, 2009;Gardner et al, 2007;Paria and Yuet, 2006;Zentar et al, 2012). In the case of a valorization process, cement proportions are usually higher to improve the mechanical behavior, and admixtures can be added to improve durability or other formulation parameters such as workability.…”

Section: Introductionmentioning

confidence: 99%

Feasibility of the reuse of total and processed contaminated marine sediments as fine aggregates in cemented mortars

Couvidat

Benzaazoua

Chatain

et al. 2016

Construction and Building Materials

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In a context promoting waste sustainable management, dredged sediments are assessed for valorization as substitute for sand in non-structural cemented mortars. Full substitution of sand by total sediment revealed low mechanical performances at UCS testing, linked to a high porosity. However, mechanical strength was improved, and porosity reduced, by using 80µmsized sediment. Thus, porosity is correlated to the presence of a fine fraction and its constitution, which brought a higher water demand during formulation. This research confirmed that the reuse of the coarser fraction of a marine sediment offered an interesting valorization potential as cemented mortars for non-structural applications.

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“…Karamalidis and Voudrias [6,11] show the optimum Portland cement and blended cement (with pozzolanic material) additions to refinery oily sludge, in terms of reducing the leaching of VOCs, alkanes and polycyclic aromatic hydrocarbons (PAHs) for solidified samples. Contaminated dredged sediments with high organic matter contents were used in mixtures of sand, fly-ash, cement and water to obtain a S/S secondary product; this product shows that the dissolved organic carbon (DOC) released concentration plays a significant role in the leaching of metals and metalloids [12]. Wastes such as foundry sludge [13] and petroleum drill cuttings [14] containing a mixture of organic compounds, heavy metals and water-soluble salts were immobilized using different S/S procedures based on Portland cement, lime and pozzolanic binders, in addition to a wide range of additives; in both studies [13,14] the leachability results of the S/S products showed a reduction of the heavy metals and organic pollutants relative to the initial waste and compliance with EU acceptance criteria for non-hazardous landfills.…”

Section: Introductionmentioning

confidence: 99%