Organic Soil Activation At High Temperature

Chemical and microbial activation energies of soil organic …

Chemical and microbial activation energies of soil organic matter decomposition Jens Leifeld & Margit von Lützow Received: 5 May 2012 /Revised: 17 May 2013 /Accepted: 24 May 2013 /Published online: 8 August 2013 ... High intrinsic temperature sensitivity may be posi-tively related to the number of enzymatic steps required for substrate ...

Generation, activation, and recycling of ammonium persulfate for …

Additionally, the remediation efficiency of PS-AOPs is easily affected by natural substances in the soil, the low solubility of organic pollutants, and the restriction of activation efficiency of PS; therefore, the amount of PS required as a remediation reagent is typically many times greater than the theoretical value, resulting in high ...

Chemical and microbial activation energies of soil organic matter

where R is the gas constant, T is the absolute temperature, k is the respiration rate, and A is the frequency or pre-exponential factor. The slope of ln k vs. T −1 equals − Ea / R.. After incubation, samples were sieved to <2 mm, dried at 105 °C, and ground. Soil C and N was determined by elemental analysis (Euro EA, HEKAtech, Germany) and soil pH was measured …

Sensitivity of soil respiration rate with respect to temperature

Soil temperature, soil moisture and oxygen concentration are among the most important variables that influence the rate of soil organic carbon (SOC) decomposition and its sensitivity to environmental change (Singh and Gupta, 1977; Davidson et al., 2011; Moyano et al., 2013; Sierra et al., 2015).The temperature sensitivity of SOC decomposition rate at low …

Effect of high-temperature dehydroxylation on acidification …

After high-temperature treatment, the Al coordination structure of montmorillonite was transformed from six-coordination to four-coordination. ... Soil acidification accelerated the weathering of soil clay minerals and the activation of soil solid Al. ... Hong ZN, Xu RK (2022) Aluminum mobilization as influenced by soil organic matter during ...

Activated persulfate for organic chemical degradation: A review

For instance, soil organic matter under basic conditions enhanced activated persulfate degradation of nitrobenzene and hexachloroethane, while a subsequent study proposed that activation by phenols contained in the soil was partially responsible (Ahmad et al., 2010, Ahmad et al., 2013).

Temperature and soil organic matter decomposition rates …

We conclude that important advances in understanding the temper-ature response of the processes that control substrate availability, depolymerization, microbial efficiency, and enzyme production will be needed to predict the fate of soil carbon stocks in a warmer world.

Thermal assisted heterogeneous activation of peroxymonosulfate …

In order to study the function of organic carbon in soil during the in situ remediation, soil was heated in a muffle oven at 600 °C for 6 h to remove the OC and labeled as soil-600 as a contrast. ... the influence of temperature as a crucial activation factor on the removal of PFOA by the combination of FAC/PMS or NAC/PMS was investigated ...

Drying-rewetting cycles decrease temperature sensitivity of soil

Temperature sensitivity (Q 10) of SOC decomposition indicates the response to a temperature increase of 10 °C (Rey et al., 2005).It is a critical parameter in soil carbon (C) and nitrogen (N) dynamics models and earth system models, helping assess the feedback between global warming and terrestrial CO 2 emissions (Oikawa et al., 2014).The Q 10 has large spatial …

Chemical and microbial activation energies of soil organic …

We analyzed reaction rates, thermal stability indices, and activation energies (Ea) during (i) microbial respiration (EaRh) and (ii) controlled combustion by differential scanning calorimetry …

Temperature sensitivity of soil enzyme kinetics under N and P

The temperature sensitivity of Vmax is negatively related to the activation energy based on the Arrhenius equation; a highly efficient soil enzyme system depends on lower activation energy, rendering Vmax temperature independent (Marx et al., 2007).

Soil organic carbon stability mediate soil phosphorus in …

Phosphorus (P) is a critical macronutrient for high-productivity crop cultivation (Zhang et al., 2020).The amount of phosphate fertilizers application reached 66.0–261 kg P ha −1 in the vegetable production system in China, which are commonly in excess of crop requirements, contributing to the soil P level higher than the critical level (46–58 mg kg −1, Yan et al., 2013).

(PDF) Effects of Temperature and Moisture on Soil Organic …

The correlation analysis reveals that high temperature and drought environment were unfavorable for developing vegetation roots and would lead to a decrease in BGB. ... an apparent activation ...

Temperature sensitivity of soil carbon decomposition and …

The temperature sensitivity of decomposition of the enormous global stocks of soil organic matter (SOM) 1,2,3,4 has recently received considerable interest, including several high-profile ...

Transformation characteristics of organic matter and phosphorus …

In addition, soil on which compost products are applied has a positive effect on crop yields, and the long-term effects of compost application are good. Compost containing high concentrations of organic matter can significantly reduce soil pH, improve nutrient absorption, and promote plant growth [23], [73]. As a result, organic matter is the ...

Activation of persulfate (PS) and peroxymonosulfate (PMS) and

For soil remediation, the increase of temperature limited the transport of PS in soil affecting the removal of organic pollutants in soil [24]. It is noted that the solubility of organic pollutants might increase with the increase of temperature. ... Similar to heat activation, ultrasonic activation was also considered as heat activation ...

Soil Respiration and Soil Organic Matter Decomposition in Response …

When the temperature sensitivity of soil respiration is determined via short-term incubation studies, the temperature response of microbial respiration can be well approximated by Arrhenius-type and Q 10 models (i.e. Jenkins and Adams, 2010, Reichstein et al., 2005).In this respect, soil microbial respiration does not differ from the instantaneous temperature response …

Temperature Sensitivity (Q10) of Soil Basal Respiration as a …

Most molecules of organic matter are stable, i.e., their energy of activation is high, so that they begin to decompose under high temperatures . On the contrary, glucose is characterized by the low energy of activation and can be mineralized under lower temperatures, and this is the cause of much quicker decomposition of added glucose than soil ...

Biochar for a sustainable future: Environmentally friendly …

Fast pyrolysis produces biochar with a higher surface area and micropore volume, suitable for applications requiring high adsorption capacity. In fact, at high temperatures (>600 °C) the micropore volume increases [33] while also biochar obtained at high temperatures and longer reaction times indicates a higher surface area [34].

Soil organic matter dynamics and stability: Climate vs. time

Soil represents the largest stock of terrestrial carbon (C) (Jobbágy and Jackson, 2000).With 2,500 Gt C, soil stocks ca. 3 times more C than the atmosphere and 4.5 times more C than the biosphere (Lal, 2004).The soil organic carbon (SOC) pool is continuously exchanging C with the atmosphere (ca. 60 Mt C yr −1) (Amundson, 2001).Given the massive role of soil as a …

Remediation HCHs POPs-contaminated soil by activated …

Among the commonly applied field activating conditions, heat activation at 40 °C is highly effective for the remediation of soil contaminated with high levels of γ-HCH by efficiently generating high levels of reactive radicals to overcome the competition of soil organic materials and other oxidizable species against the oxidation of γ-HCH ...

Changes to soil organic matter decomposition rate and its temperature

Forest swamps store a large amount of organic carbon (C) under anaerobic conditions. It is estimated that global wetlands (about 6% of land surface area) store about 541 Pg C, accounting for 34.6% of soil C pools in terrestrial ecosystems (Zoltai and Martikainen, 1996).Soil C density or accumulation is particularly high in cold-temperate forest swamps, …

Chemical and microbial activation energies of soil organic matter

A high temperature sensitivity of microbial respiration is linked to parameters independent of chemical oxidizability, in our case, organic matter C/N ratio and soil pH.

Thermal activation of persulfates for organic wastewater …

A relatively low temperature is satisfactory for PDS activation, while an extremely high temperature is required to activate PMS without a catalyst in solution. Both 1 O 2 and •OH were observed in a NaOH/heat (75 °C)/PMS system, and 1 O 2 played a predominant role generated from alkaline activation [81]. This report indicated the difficulty ...

The temperature sensitivity of soil organic matter decomposition is

This describes the temperature sensitivity of enzyme-catalysed reactions, with the hypothesis that reactions with a high activation energy (E A) should also show a high temperature sensitivity, meaning that turnover of chemically more recalcitrant compounds should be more responsive to changing temperatures (Bosatta and Ågren, 1999, Sierra, 2012).

Changes in Temperature Sensitivity and Activation Energy of Soil

Here, we focused on three main grassland types (alpine meadow, steppe, and desert) and conducted a soil incubation experiment at five different temperatures (5, 10, 15, 20, and 25°C) …

Chemical and microbial activation energies of soil organic matter

Polycyclic aromatic hydrocarbons degradation mechanisms in …

The main mechanisms in the microwave heating-activated PS process include microwave induced thermal activation; high-temperature desorption processes; high-temperature diffusion and mass ... the remediation effect commonly affected by soil conditions (i.e., organic matter, soil texture, anions, and pH values, et al), the optimized designs are ...

Unveiling the radical to nonradical pathway transformation in

Peroxymonosulfate (PMS)-based Fenton-like processes appear as promising strategies for the soil and groundwater remediation of refractory organic pollutants, due to its high stability and ability to generate powerful radicals [1].The strong oxidizing radicals, including SO 4 •− (+2.60 ∼ +3.10 VNHE) and • OH (+1.90 ∼ +2.70 VNHE), can be generated by activating PMS through …

Synergetic degradation of perfluorooctanoic acid (PFOA) in soil …

The soil temperature increased rapidly within 3 h, and the soil temperatures at the locations S2–S4 reached 85.4, 100.8 and 99.9 °C, respectively (SI Table S5). According to the research results in Section 3.1, this temperature range could effectively activate PS in soil.

Soil organic carbon stabilization is influenced by microbial …

This study investigates the effects of temperature (ambient: 25 °C; elevated: 27.5 °C) and soil microbial diversity (low, medium, and high) on the formation of stabilized SOC, …

Linking temperature sensitivity of soil organic matter

Enzyme-kinetic hypothesis suggests that decomposition of low-quality substrate (recalcitrant molecular structure) requires higher activation energy and thus has greater temperature …

Treatment of PAH-contaminated soil by persulfate: a review

When soil organic matter was removed, Fe/Mn oxides were responsible for PS activation with significant correlations between PS t 1/2 and free Fe/Mn-oxide content [24]. No correlation with the content of other Fe or Mn species was observed, showing that Fe/Mn oxides exhibit better reactivity for PS decomposition among Fe/Mn minerals [24] .

Soil Temperature: Impacting Plant Growth And Development

Variation in soil temperature (very low to high temperature) affects the absorption of soil water by the plant roots. ... Soil temperature influences organic matter decomposition, which in turn affects plant growth. ... It is required for seed imbibition, enzymatic activation, degradation, translocation, and the utilisation of reserve storage ...