Influence of oxygen flow rate on reaction rate of organic matter in leachate from aerated waste layer containing mainly incineration ash

Asakura, Hiroshi; Endo, Kazuto; Yamada, Masato; Inoue, Yuzo; Ono, Yusaku

doi:10.1016/j.wasman.2010.06.001

Cited by 7 publications

(4 citation statements)

References 17 publications

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“…Figure 7 shows the relationship between OFR and TOC solid reduction, with pH of leachate (at day 65) as parameter. The range of OFR by natural ventilation (amount of oxygen introduced to a semi-aerobic landfill by convection and diffusion flow) previously reported by the authors (Asakura et al, 2010) in the same experiment is also shown in Fig. 7.…”

Section: Discussionsupporting

confidence: 62%

Influence of oxygen flow rate and compost addition on reduction of organic matter in aerated waste layer containing mainly incineration residue

Asakura

Nakagawa

Endo

et al. 2013

Journal of Environmental Sciences

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1Landfilling municipal solid waste incineration (MSWI) residue alkalizes the waste layer, 2 causing a subsequent decrease in microbial activity and a delay in the decomposition of 3 organic matter. In this study, efficiencies of neutralization of the leachate and organic 4 matter decomposition in the waste layer in a column filled with MSWI residue using 5 aeration and compost addition were evaluated. Total organic carbon (TOC) reduction in 6 the waste layer is large at high oxygen flow rate (OFR). To effectively accelerate TOC 7 reduction in the waste layer to which compost was added, a high OFR exceeding that by 8 natural ventilation was required. At day 65, the pH of the leachate when OFR was above 9 10 2 mol-O 2 /(day·m 3 ) was lower than that when OFR was below 10 1 mol-O 2 /(day·m 3 ). 10At the same OFR, the pH of waste sample was lower than that of waste sample with 11 compost. Although leachate neutralization could be effected by compost addition, TOC 12 reduction in the waste layer became rather small. It is possible that humic substances in 13 compost prevent the decomposition of TOC in MSWI residue.14 15

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Section: Discussionsupporting

confidence: 62%

Influence of oxygen flow rate and compost addition on reduction of organic matter in aerated waste layer containing mainly incineration residue

Asakura

Nakagawa

Endo

et al. 2013

Journal of Environmental Sciences

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“…This indicates that DOM itself has the potential to alter zooplankton behavior. A possible explanation could be a change in waterborne oxygen concentration due to chemical consumption in oxidation processes (Asakura et al, 2010;Ylla et al, 2012).…”

Section: Discussionmentioning

confidence: 99%

Water Browning Influences the Behavioral Effects of Ultraviolet Radiation on Zooplankton

Wolf

Heuschele

2018

Front. Ecol. Evol.

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In the last decades, limnic water bodies in the Northern hemisphere have experienced a noticeable browning, i.e., increasing levels of dissolved organic matter (DOM). While the effects on primary producers is usually considered negative (light attenuation), zooplankton is thought to benefit from increased DOM, which absorbs harmful ultraviolet radiation (UVR). However, behavioral alterations due to browning in zooplankton have not yet been studied. We investigated the effects of a DOM gradient, alone and in combination with UVR, on the swimming behavior of Daphnia magna. Making use of a computer-controlled imaging system, we repeatedly filmed individuals over 6 h and analyzed the video material to unravel effects on exploration behavior and other motility patterns. The results show that increasing DOM buffers the detrimental effects of UVR on swimming behavior. This is likely due to attenuation of UVR by DOM. Interestingly, DOM also raised the overall swimming activity independent of UVR exposure. Our findings highlight the importance of DOM in freshwater systems, not only because of its physico-chemical properties, but also due to its higher-level effects on zooplankton communities.

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“…Untreated organic wastes were landfilled, which not only causes serious pollution of soil, water, and air but also wastes salt resources [24][25][26][27]. Incineration is considered to be an effective treatment because it can efficiently decompose organic matter at high temperatures [28][29][30][31], so that the NaCl in the industrial waste salt can be recycled. However, the decomposition process of organic matter produces a large number of toxic gases, which pose a great threat to the environment [32,33].…”

Section: Introductionmentioning

confidence: 99%

Recovery of Valuable Metals and NaCl from Cobalt-Rich Crust and Industrial Waste Salt via Roasting Coupling Technology

Feng

et al. 2021

J. Sustain. Metall.

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Ocean cobalt crust has attracted much attention due to the high economic potential of various metals. A large amount of industrial waste salt is usually filled or deposited without treatment, causing severe environmental pollution and waste of salt resources. In this work, to recover valuable metals (Cu, Co, Ni, and Mn) and NaCl from cobalt-rich crust and industrial waste salt and diminish energy consumption, a roasting coupling technology has been proposed and process and mechanism were investigated. In the reduction roasting process, the organic matter in industrial waste salt was continuously pyrolyzed, producing a large amount of reducing gases such as CO, CH 4 , and H 2 , which could react with the MnO 2 and Fe 2 O 3 in the cobalt-rich crust to destroy its original crystal structure. The results revealed that the reduction process of cobalt-rich crust was gradually completed from the surface layer of particles to the core. The NaCl and Cu, Co, Ni, and Mn in the roasting residues can be recovered by water leaching and acid leaching, respectively. Under the mass ratio of industrial waste salt to ocean cobalt-rich crust of 7:5, the roasting temperature of 973.15 K, and the roasting time of 25 min, the leaching efficiency of Cu, Co, Ni, and Mn reached 96.03%, 97.98%, 98.52%, and 99.74%, respectively, and the 98.49% recovery rate of NaCl could be achieved. The present process may simultaneously realize the extraction of metals from the cobalt-rich crust and the resource utilization of waste salt.The contributing editor for this article was Zhi Sun.

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Influence of oxygen flow rate on reaction rate of organic matter in leachate from aerated waste layer containing mainly incineration ash

Cited by 7 publications

References 17 publications

Influence of oxygen flow rate and compost addition on reduction of organic matter in aerated waste layer containing mainly incineration residue

Influence of oxygen flow rate and compost addition on reduction of organic matter in aerated waste layer containing mainly incineration residue

Water Browning Influences the Behavioral Effects of Ultraviolet Radiation on Zooplankton

Recovery of Valuable Metals and NaCl from Cobalt-Rich Crust and Industrial Waste Salt via Roasting Coupling Technology

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