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Fenton process was investigated for the purpose of biological sludge disintegration. The Box–Wilson experimental design was employed to evaluate the effects of major process variables (Fe(II) and H2O2 concentrations) on both disintegration and dewatering performance of sludge. Results showed that 4 g Fe(II)/kg total solids (TSs) and 60 g H2O2/kg TS are efficient for floc disintegration. Fenton pre‐treatment enhanced the biodegradability of sludge. For 4 g Fe(II)/kg TS and 60 g H2O2/kg TS, 19.4% higher methane production was achieved compared to raw sludge in biochemical methane potential assay. Fenton pre‐treatment resulted in the release of organic sludge components into the liquid phase. For 4 g Fe(II)/kg TS and 60 g H2O2/kg TS, dissolved organic carbon and total nitrogen in sludge's supernatant increased by 75.74 and 60.60%, respectively. Fenton pre‐treatment enhanced the filterability of sludge and it can be applied for conditioning purpose before mechanical dewatering units. 相似文献
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Yu. L. Gulbin 《Geology of Ore Deposits》2015,57(8):699-711
Phase equilibria in medium-grade metapelites of the Northern Ladoga area are calculated with the pseudosection method and Theriak/Domono software on the basis of zoning in garnets. It is shown that garnet in the staurolite-bearing parageneses crystallized at 520–600°C against the background of a pressure release from 7.0 to 3.5–4.0 kbar. The evolution of the mineral composition of rocks in the course of porphyroblast formation is discussed, placing special emphasis on the comparative analysis of P–T paths of garnet growth under decompression conditions. 相似文献
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Yu. L. Gulbin 《Geology of Ore Deposits》2013,55(8):613-624
The kinetics of zoned garnet porphyroblast growth is exemplified in a sample of garnet-staurolite-biotite schist from the northern Ladoga region. The diffusion-controlled porphyroblast growth was accompanied by a decrease in the kinetic coefficient during phase reactions. Even at insignificant (1–2°C) thermal overstepping, the leading role of diffusion as a factor that controls kinetics of porphyroblast growth in medium-grade metapelites is consistent with the parameters of metamorphic crystallization: T = 500–650°C, t = 1 Ma; D A1 app = 10?14 cm2/s, L = 0.2–0.6 cm, r = 1–3 mm, ΔC Al = 1.5 × 10?4–1.5 × 10?3 mol/cm3. 相似文献
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The surface microtopography of garnet from metamorphic schists of the northern Ladoga region has been investigated. The morphology of garnet is distinguished by a rough stepped surface on dodecahedral faces {110} and by the absence of sharp crystal edges. As follows from experimental results on crystal growth under hydrothermal conditions, the microtopography pattern gives evidence for a highly oversaturated inter-granular medium and the important role of diffusion as a factor controlling garnet growth. 相似文献
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Yu. L. Gulbin 《Geology of Ore Deposits》2012,54(8):616-624
The fluid regime of medium-grade metapelitic systems was studied with mineral fugometers. It has been established that at least some of the rocks under consideration contain mineral assemblages equilibrated with the participation of fluids with an appreciably lowered mole fraction of the aqueous component (0.4–0.7). The data obtained are used to explain the systematic discrepancy between the temperature estimated with the garnet-biotite geothermometer and the program THERMOCALC. It has been suggested that the negative correlation between the temperature intervals of crystallization and the nucleation temperature of the studied garnets is related to the kinetic features of porphyroblast growth. 相似文献