WEBJan 1, 2024 · Owing to the differences in raw coal and production processes, the water quality of wastewater varies, making it difficult to establish fixed treatment methods for it (Shi et al., 2023b). Owing to the complex composition of coal chemical wastewater, single conventional wastewater treatment process cannot meet treatment requirements.
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WEBJun 1, 2024 · Moreover, the removal rate of PAHs in the conventional biochemical treatment process is only 8–15 % (Jia et al. 2016). Consequently, the key challenge in clean production and highquality development in the coal chemical industry is the urgent need to realize the effective degradation of aromatic compounds and the harmless .
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WEBJan 1, 2017 · After treatment, the concentration of phenols in the wastewater was reduced to 450 mg/L, suitable for connection with a biochemical treatment process (Yu et al., 2010). In this process the cost for removing phenol, ammonia and other pollutants is the high energy consumption for distillation and stripper process (Feng et al., 2009).
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WEBDec 1, 2021 · This review analyzes all the treatment technologies of the typical coal chemical wastewater projects investigated in China based on these three processes. From the evaluation of the advantages and ...
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WEBTo analyze the bottleneck of industrial coalgasifiion wastewater treatment process,the full process modeling and flowsheeting were completed based on the further development of Aspen representative components,the thermodynamic method and the calculating module for each unit were selected based on the analysis of the industrial .
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WEBAug 15, 2023 · The extraction process of CBM involves the dewatering of coal seams, enabling the release of trapped methane gas [1].However, one of the primary challenges encountered during CBM production is the significant amount of water that accompanies the extracted gas [2].This water, known as produced water, poses a major problem in terms .
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WEBMar 4, 2021 · Coal chemical enterprises should undertake one to two environmental protection demonstration tasks, while also undertaking process demonstration tasks. Coal chemical industry enterprises should conduct wastewater treatment technology demonstration from the aspects of highconcentration organic wastewater treatment, .
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WEBIn industrial chemistry, coal gasifiion is the process of producing syngas—a mixture consisting primarily of carbon monoxide (CO), hydrogen (H 2), carbon dioxide (CO 2), methane (CH 4), and water vapour (H 2 O)—from coal and water, air and/or oxygen.. Historically, coal was gasified to produce coal gas, also known as "town gas".Coal gas .
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WEBFeb 1, 2023 · Cui et al. [10] proposed a new water treatment index system for the whole process of coal chemical industry, which combined the process of each unit and clarified the concentration limits of the index and the quality standard for the recycling water. However, most of the researchers focus only on zero liquid discharge (ZLD) without .
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WEBJul 1, 2023 · Section snippets Source of inoculum and real wastewater. Coal chemical wastewater (CCW) and excess sludge used for the operation of A/O bioprocess in this study were collected from a fullscale A 2 /O process in Sinopec Nanjing chemical industries Co., Ltd in China. The effluent from the first anaerobic unit of fullscale A 2 /O process was .
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WEBJan 20, 2017 · 1. Introduction. In Lurgi and BGL (British Gas Lurgi) coal gasifiion process, wastewater containing high concentration of phenol and ammonia are discharged (Zhang et al., 2015).The flow rate of this wastewater is large and included pollutants are various (Wei et al., 2016).The concentration of phenol and COD in the wastewater is in a .
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WEBNov 10, 2016 · Coal gasifiion wastewater treatment process, especially for the wastewater produced by pressurized fixed bed gasifiion, has already become one of the key factors which restrict the ...
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WEBIn this study, the toxic organics removal and biotoxicity reduction of coal chemical wastewater (CCW) along a novel fullscale treatment process based on the pretreatment processanaerobic processbiological enhanced (BE) processanoxic/oxic (A/O) processadvanced treatment process was evaluated.
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WEBA process for converting a finely divided carbonaceous material, particularly coal, to a fuel gas. A finely divided or pulverized carbonaceous feed material, such as coal, is pretreated at a temperature of about 700 to 800/sup 0/F in order to destroy the caking properties of a caking coal feed in a fluidized pretreatment zone, or, alternatively to dry a noncaking .
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WEBJul 10, 2020 · 1. Introduction. Coal plays a significant role in the energy mix of China (Dudley, 2019), which accounts for approximately % of the total installed capacity (National Bureau of Statistics of the People's Republic of China, 2019).With the everincreasing stringent limits on pollution emissions from the energy industry in China, flue .
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WEBSep 1, 2016 · The treatment of coal gasifiion wastewater (CGW) poses a serious challenge on the sustainable development of the global coal industry. The CGW contains a broad spectrum of highstrength recalcitrant substances, including phenolic, monocyclic and polycyclic aromatic hydrocarbons, heterocyclic nitrogenous compounds and long chain .
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WEBJul 10, 2020 · Zero emission of wastewater from coalfired power plants (CFPPs) is one of the pathways for cleaner electricity production. It is expected that lowcost and reliable zero liquid discharge (ZLD) of flue gas desulphurization (FGD) wastewater will be achieved by applying the forced circulation multieffect distillation and crystallization (FCMEDC) .
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WEBFeb 1, 2020 · Generation and treatment process of coal gasifiion wastewater. Water treatment in coal liquefaction. According to National Plan for MediumandLong Term Energy Development, coal liquefaction capacity is to increase to 30 million t/a (NDRC, 2007) in 2020. The planned coal liquefaction projects have achieved million t/a in .
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WEBApr 3, 2018 · An investigation was carried out aimed at checking the feasibility of the novel bioelectroFenton process with FeVO 4 /CF hode on advanced treatment of coal gasifiion wastewater. The maximum power density arrived mW/m 3 in MFCFeVO 4 /CF system, which was corresponding to a current density of A/m 3 at the .
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WEBJun 25, 2020 · The article presents a comprehensive study of the hydrolysis acidifiion process during anaerobic treatment of coal gasifiion wastewater (CGW), a complex and toxic industrial effluent. The authors analyze the evolution of dissolved organic matter and biotoxicity in different stages of the process, and compare the performance of .
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WEBNov 15, 2016 · It causes that the simulations probably deviate seriously from actual data. Therefore, the accuracy of the simulations for industrial coal gasifiion wastewater treatment units needs to be improved further. These tasks should promote the simulation, design, and optimization of the treatment process of coal gasifiion wastewater.
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WEBAug 1, 2004 · The Bas process consists of the following stages: stage where barium sulphate is reduced to barium sulphide at 1 050°C, using coal as the reductant. removal stage ...
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WEBFeb 4, 2010 · Coalgasifiion wastewater poses serious problems in the Lurgi process. It cannot be easily purified, as the high pH value of the wastewater limits the dephenolization efficiency of extraction. This work proposes a new process to remove ammonia and sour gas in order to reduce the pH value of the wastewater from 9 to below 7, and next to .
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WEBJun 25, 2020 · Coal gasifiion wastewater (CGW) contains several types of aromatic pollutants, which impart high biotoxicity and reduce the quality of anaerobic treatment. Two types of hydrolysis acidifiion processes, namely microaerobic hybrid reactor (HA1) and upflow anaerobic sludge blanket reactor (HA2), were developed for pretreatment .
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WEBApr 1, 2024 · The treatment of diverse mine waters and coal chemical effluent has grown to be a serious environmental issue with the growth of the coal mining and coal chemical industries [1, 2].The world coal consumption chart (Fig. 1) shows that China had the highest coal usage in 2021, reaching EJ [3].Coal gasifiion is one of the primary uses of .
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WEBJan 1, 2022 · Table 1 shows the A/A/O process effectively removed organic and inorganic pollutants from CWW. The total COD removal by A/A/O process during the operation period was approximately % with the average COD in the A1 effluent, A2 effluent and O effluent at 2056, 987 and 215 mg L −1, than twothirds of COD was .
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WEBSep 30, 2021 · Beneficiation of coal is a water intensive process, and the water is recovered in downstream operations in the high rate thickener (HRT) and vacuum belt filtration (VBF). Clean coal particles entering the HRT have an inherent tendency to enter the overflow because they are extremely fine and hydrophobic. Hence, flocculants .
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WEBJan 1, 1980 · The 1977–2015 literature on treatment of the coal gasifiion wastewater is reviewed. An overview based on ammonia and phenol recovery, biochemical treatments and advanced treatment technologies is presented with the purpose of unveiling the reasons behind problems of high concentration of persistent organic pollutants being .
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WEBDec 5, 2020 · Coking wastewater is one of coal chemical wastewater, which contains various refractory organic pollutants. To meet the more and more rigorous discharge standard and increase the reuse ratio of coking wastewater, advanced treatment process must be set for treating the biologically treated coking wastewater.
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WEBTreatment Processes. In a typical pressure treatment process, wood is placed in a horizontal cylinder up to 150 ft. long and 7 ft. in diameter as shown in Figure 3. The cylinder is flooded with the chemical followed by a cycle of pressure and vacuum. Pressure treatment methods are classified into two basics groups: fullcell and emptycell ...
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WEBFeb 1, 2021 · Coal gasifiion brine (CGB) is a typical hypersaline organic wastewater and its proper treatment is a challenging task. In the study membrane distillation (MD) experiments were conducted with raw and pretreated CGB as the feeds. The flux evolutions and permeate quality in different processes were compared to study the interaction .
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WEBNov 15, 2016 · It causes that the simulations probably deviate seriously from actual data. Therefore, the accuracy of the simulations for industrial coal gasifiion wastewater treatment units needs to be improved further. These tasks should promote the simulation, design, and optimization of the treatment process of coal gasifiion wastewater. 2.
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WEBFeb 15, 2021 · Coal fly ash (CFA) is a byproduct of coal combustion in coalfired power stations. ... The variation of pH during the treatment process was monitored. The final pH of the treated wastewater increased from,,,, and to,,,,, respectively. This could be caused by the dissolution of the residual .
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WEBJul 1, 2023 · The above two experimental results show that the MBR process has a good treatment effect on coal chemical wastewater. Although MBR has been used successfully in the industrial wastewater treatment industry. However, for many years, membrane fouling has been a hot spot and focus in MBR research.
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A material supplier from Belgium would like to produce limestone powder for his custome...
India is rich in various mineral resources and it is an important mineral processing market
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