Individual and Competitive Adsorption of Copper, Zinc and Lead in Soils with Contrasting Texture

Kummer, Larissa; Gonçalves, Morgana Suszek; Zemiani, Adriana; Melo, Vander de Freitas; Gomes, Simone Damasceno

doi:10.9734/jeai/2018/43891

Cited by 3 publications

(2 citation statements)

References 22 publications

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“…Soils with high organic matter, high CEC, and high pH exhibited strong adsorption for Zn, but with no exception for Cd, Cu, Ni, and Pb [41]. However, competitive adsorption behaviors between different heavy metals would produce great influence [42,43]. When Cu was present, Zn was weakly bound to soil surfaces and was released in high amounts during desorption [44].…”

Section: Risk Assessment Of Groundwater By Heavy Metals In Sludgementioning

confidence: 99%

Woodland for Sludge Disposal in Beijing: Sustainable?

Shi

et al. 2022

Sustainability

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The sludge products of urban sewage treatment plants in Beijing are increasing year by year, and there is a large amount of stagnation, which requires scientific and reasonable disposal strategies. Currently, the woodland in the mountainous area of Beijing is considered the main means for sludge disposal; however, because the heavy metals in the sludge may cause potential pollution to the soil and groundwater, it is unclear how much sludge can be applied per unit area. To ensure the sustainable disposal of sludge, it is necessary to measure the risk of heavy metals on soil and groundwater under different sludge application rates to determine the most scientific disposal plan. In this study, the undisturbed soil columns obtained from the field were used to clarify the migration behaviors and accumulation of eight hazardous heavy metals under simulated rainfall conditions, and three sets of tests (the application rates of sludge products were 30 t·ha−1·a−1, 60 t·ha−1·a−1 and 120 t·ha−1·a−1 respectively) were set based on the supply–demand relationship between Beijing’s annual sludge output and the woodland area available for sludge disposal. The results showed that there were significant differences in the migration rules of heavy metals under different application rates, which were mainly reflected in the differences in accumulation in each layer of the soil. In terms of the leaching efficiency of heavy metals, except for Cadmium, the leaching rates of other heavy metals did not exceed 0.1%, indicating that most heavy metals accumulated in the soil. During the application process of sludge products, Arsenic and Cadmium posed a greater potential risk to groundwater than other heavy metals, to which should be paid sufficient attention. Based on the accumulation of heavy metals in soil, Arsenic was the main factor limiting the amount and frequency of sludge product application. The application rate of 60 t·ha−1·a−1 was preferred compared with the other two tests because it presented minimal risk to groundwater and soil in the short term, while the total amount of sludge disposal can be maximized.

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Section: Risk Assessment Of Groundwater By Heavy Metals In Sludgementioning

confidence: 99%

Woodland for Sludge Disposal in Beijing: Sustainable?

Shi

et al. 2022

Sustainability

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“…In sludge application, the high concentration of zinc (heavy metal) in the sludge (514 mg.kg -1 ) used in the present study, and reported by Amaral et al (2018), was responsible for the impacts in this category. According to Kummer et al (2018), zinc has a low potential for adsorption in soils and, thus, is easily leached into rivers and groundwater.…”

Section: Environmental Assessment Of the Stp With Sludge Destined For Agriculture Usementioning

confidence: 99%

Evaluation of the environmental life cycle of an STP that employs a low-rate trickling filter as post-treatment of a UASB reactor and different sludge-management alternatives

Amaral¹,

Rietow²,

Aisse³

2021

Rev. ambiente água

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This study aimed to undertake an environmental life cycle assessment (LCA) of a sewage treatment plant (STP) equipped with low-rate trickling filters (TFs) as post-treatment of upflow anaerobic sludge blanket (UASB). The STP is located in South Brazil and uses landfill and agriculture as sludge-disposal alternatives. The evaluation was performed using the LCA technique and SimaPro® 9 software. The results revealed that the gases methane (CH4) and sulfur dioxide (SO2), emitted into the atmosphere after the partial burning of the biogas in flares, are mainly responsible for impacts in the categories of global warming (GW) and terrestrial acidification (TA), respectively. Due to the low rate of hydraulic sewage application in TFs, nitrous oxide (N2O) emissions stood out due to their high impact in the category of stratospheric ozone depletion (SOD). The use of sludge in agriculture obtained a greater potential for environmental impact compared to landfills in five of the eight categories evaluated. The main impacts of agricultural use were in the category of human toxicity (HT), due to the high concentration of zinc present in the sludge, and in the category TA, due to the emission of ammonia (NH3) during hygienization of the sludge. In turn, the main positive aspects were avoided products, such as urea, phosphate fertilizer and limestone. The results contribute to a greater discussion of sewage-treatment processes, as well as sludge-management alternatives used in developing countries.

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