The removal effects of main toxic organic pollutants in semi-coking wastewater by combined treatment process were investigated, while the genotoxicity relevance of wastewater from different treatment units were monitored by using Vicia faba bioassays. Results showed that 37 kinds of toxic organic pollutants were detected in the crude sewage, most of them were …
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MODERN DELAYED COKING PROCESS The delayed coker is the only main process in a modern petroleum refinery that is a batch-continuous process. The flow through the tube furnace is continuous. The feed stream is switched between two drums. One drum is on-line filling with coke while the other drum is being steam-stripped, cooled, decoked, pressure
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The removal effects of main toxic organic pollutants in semi-coking wastewater by combined treatment process were investigated, while the genotoxicity relevance of wastewater from different treatment units were monitored by using Vicia faba bioassays. Results showed that 37 kinds of toxic organic po …
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The wastewater from coal carbonization was divided into two categories: the semi-coking wastewater produced from the middle- (700–800 °C) and low- (500–600 °C) temperature carbonization processes and the coking wastewater produced from the high-temperature carbonization process (950–1050 °C).The semi-coking and coking wastewater exhibit similar …
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Light oil (coal), semi-coking process chemical information summary.
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In this paper, the authors analyze the properties and composition of shale coke obtained by coking of light and heavy shale oil fractions at temperatures around 500 °C and a variation of …
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Materials. The carbon source was semi-coking wastewater acquired from Yulin, Shaanxi, China. The content of phenols in semi-coking wastewater was determined by (National Standard, 2014), and the content was about 3,000 mg L −1 (Wang et al., 2020).The chemicals, including, formaldehyde, ethanol, acetone, potassium hydroxide, and hydrochloric acid, were purchased …
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Figure 1 shows the process of treating semi-coking wastewater. The pilot scale process was designed to handle 5–10 t/d of raw semi-coking wastewater. Methyl isobutyl ketone was used as the extractant, whereas the extractant to wastewater volume ratio was 1 to 8, respectively. In addition, the extraction time was 15 min.
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The emergent semi-coking wastewater had the characteristics such as large amounts of discharge, high toxicity, high concentration ammonia nitrogen and chemical oxygen demand (COD), which make it more difficult to treat by biological method (Ailijiang et al., 2021).Phenols and petroleum hydrocarbons with higher concentration were concurrently …
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Radical release and evolution during the coking process were studied to improve the understanding of chemical and carbon structural transformation during the coking process. The ESR technique was used to detect unpaired electrons on stable radicals to investigate the structural transformation from the plastic layer to semi-coke during pyrolysis.
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LFC process is designed and developed by the United States. The coal is dried and retorted into semi coke by inert gas heat carrier in two steps in two rotary furnaces of drying and retorting. COED process was proposed by the United States in 1962. Pulverized coal is dry distilled into semi coke by hot gas in four continuous fluidized beds.
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Five benzenes, 11 phenols, and five polycyclic aromatic hydrocarbons (PAHs) were investigated as the dominant contaminants in semi-coking wastewater. Because of residual extractant, the phenols extraction process increased acute toxicity to V. fischeri and immobilization and lethal toxicity to D. magna.
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3.1 The Heating Rate of Coal in Coking Chamber Temperature conditions in a coal charge during coking depend on the location towards heating walls of a coke oven. In general, temperature distribution in a coal charge during coking process is mainly connected with the location towards heating walls and with the time of coking. Three zones have
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Semi coke is the solid products, obtained from low-rank bituminous coal, lignite, or peat by carbonization at low temperature (500–750 °C) in a retort furnace. In general, semi coke is also a by-product or intermediate product of the conversion of coal into liquid and gaseous …
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The detailed information about the molecular structure transformation in the thermoplastic stage has not been acquired. Therefore, the insight into and the establishment of the 3D carbon structures of the semi-coke during the coking process is crucial for achieving a comprehensive understanding of the carbon structure evolution.
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Semantic Scholar extracted view of "Treatment effects and genotoxicity relevance of the toxic organic pollutants in semi-coking wastewater by combined treatment process." ... GC/MS was used to investigate the organic pollutants removal in the activated sludge process for treating coking plant wastewater. A new C 18 mini column was applied for ...
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화학 물질 안전 데이터시트 MSDS/SDS Light Oil (Coal), Semi-Coking Process; Fresh Oil; [The Volatile Organic Liquid Condensed From The Gas Evolved In The Low-Temperature (Less Than 700캜 (1292캟)) Destructive Distillation Of Coalposed Primarily Of C6-10
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Semi-coke is made by charging coal into hot ovens, usually in the temperature range 350-500°C. Layers of plastic coal are formed parallel to the heated oven surfaces and these move …
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The process optimization experiment was carried out by adjusting the dilution multiples of semi-coking wastewater to 20, 50, 100, 200, 500 and 1000, respectively. It can be seen from Fig. 4 b that the removal rates of COD, NH 3 -N and VP continued to increase when diluted 20–200 times, and the removal rate decreased when diluted 200 ∼1000 ...
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In order to address the low thermal efficiency of low-rank coal combustion and the accompanying serious environmental issues, formed coke was prepared using a carbonization consolidation method with low-rank coal …
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Delayed Coking. Figure 6.6 shows a flow scheme in a delayed coking progress and a photograph of a delayed coking unit. The s above the drums that contain the drill stems are used to drill out the coke from the coke drums at the end of the coking cycle. ... while coke is removed intermittently in a semi-continuous process scheme ...
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The microbial community consisting of Pseudomonas stutzeri N2 and Rhodococcus qingshengii FF could effectively and simultaneously remove phenols and petroleum hydrocarbons, and these two strains possess great potential of being applied in aerobic biological treatment process of large-scale semi-coking wastewater.
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As illustrated in Fig. S1, the designed semi-coking wastewater treatment processes of a coking enterprise in Yulin, Shanxi Province, China, consisted of pretreatment, biological treatment and advanced oxidation process with a capacity of ∼3000 m 3 /d. The pretreatment units included an oil-water separator, two ammonia-stripping towers, and a ...
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Semi-coking wastewater contains a rich source of toxic and refractory compounds. Three-dimensional electro-Fenton (3D/EF) process used CuFe 2 O 4 as heterocatalyst and activated carbon (AC) as particle electrode was constructed for degrading semi-coking wastewater greenly and efficiently. CuFe 2 O 4 nanoparticles were prepared by coprecipitation method and …
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The transformation of the carbon structure of coal during the coking process influences the coke microstructure and microtexture, and ultimately, the coke quality. ... Mechanism of carbon structure transformation in plastic layer and semi-coke during coking of Australian metallurgical coals. / Chen, Yixin; Lee, Soonho; Tahmasebi, Arash et al.
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This study employs a combined phenolic condensation-persulfate advanced oxidation technology to treat high-concentration semi-coking wastewater, focusing on …
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The degassed coal is semi-coke, it is broken into 3-4mm particle size, and briquetted with binder, then oxidized at 200-300 degrees Celsius to obtain hardened briquette. Finally, the briquette is coked at a temperature higher …
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Current semi-coking wastewater treatment process has low performance of pollutants removal and consumes a large amount of high-grade steams. It far exceeds the semi-coke plants' utilities supply capacity and easily lead to the breakdown of whole treatment system. This paper identified the bottleneck of current process as followed: low removal ...
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coking wastewater, but the COD concentration of semi-coking wastewater is approximately 10 times higher, and the concentrations of ammonia nitrogen and phenols are also significantly higher than coking wastewater (Bokun et al., 2020). Semi-coking wastewater is the most harmful type of wastewater due to its high COD and high toxicity (Ma et al.,
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Delayed coking is a semi-continuous process in which the heated charge is transferred to large soaking (or coking) drums, which provide the long residence time needed to allow the cracking …
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