Treating mine water as a resource is the only way to alleviate water shortage and the environmental pollution issues generated at mining sites in areas of northern and western China. By investigating 77 coal mine water treatment stations in western China, we sought to analyze the application status, direct operating costs, and the challenges of using membrane separation technology for this ...
This treatment process works well to reduce the suspended solids, metals, and acidity in the wastewater, but it leaves in solution the highly soluble salts, including calcium, magnesium, sodium ...
The abovementioned four coal liquefaction residue treatment process schemes have the same process of fluidized pyrolysis reaction parts, and the material balance of the reaction is shown in Table 3. For a direct coal liquefaction plant with an oil output of 1 million tons/year, the byproduct coal liquefaction residue is about 700,000 tons/year.
The treatment process of the wastewater from fixedbed gasification is complex and the operation cost is high (Yang and Corsolini, 2019). Coal chemical projects consume a large quantity of water and produce a lot of wastewater, respectively (Chen et al., 2020). Most of the coal chemical projects are located in the northwest region of China ...
In order to solve the problem of mine water treatment in the production process of coal mine enterprises, the source and characteristics of mine water are introduced, and the zero discharge technology of mine water is studied and applied in engineering, the zero discharge technology of mine water includes three stages: pretreatment, concentration and reduction, and evaporation and crystallization.
The process of dealing with — or remediating — a closed mine site can come with several key issues and challenges, especially from a water treatment perspective. At the end of their productive working lives, it is vitally important to ensure that mines are managed in a manner that mitigates or eliminates any potentially adverse effects.
Furthermore, the biotoxicity assessment will provide a critical reference for rethinking the feasibility and ecofriendly of the treatment process. Coal chemical wastewater (CCW) was known for a typical industrial wastewater with the large discharge amount and complex composition.
Optimum process conditions were selected based on the minimum loss of NaOH and maximum PD (so that reactor volume required per ton of raw coal treatment can be minimized) along with the desired ...
The whole treatment process of CPW is shown in Fig. 1. The coal particles are introduced into the drying unit to provide steam for CLG and the remaining dry coal enters into the pyrolysis unit to produce pyrolysis gas and char. The CPW is generated during cooling and separation of pyrolysis gas. The dotted red line represents the impact of CPW ...
A new technology for removing mercury from coal by mild thermal coal treatment using a rotary kiln is presented. Experiments performed at the large laboratory scale show that 93% of the mercury is removed; moreover, the thermal properties of the fuel obtained from the process are also improved. In this article, we describe the physicochemical ...
Patent: Coal treatment process and apparatusCoal treatment process and apparatus
In this study, coal fly ash was functionalized, using a simple onestep process (loading with Al3+ and sulfonation), to yield a solid acid catalyst (S/AlCFA) with strong acid sites. The catalyst was then used to produce furfural from xylose in a biphasic system (H2O(NaCl)/tetrahydrofuran). The furfural yield reached 82% at 180 °C60 min with catalyst/xylose ratio of : (w/w).
I claim: 1. A process for treating coal to reduce the level of ashforming impurities contained therein comprising: a. grinding raw coal to a particle size of less than about 40 microns in a substantially air free environment to form a coalfraction which comprises a major portion of hydrophobic coal particles and a minor portion of hydrophilic coal particles, and an impuritiesfraction ...
Biochemical treatment is the main process of coal chemical wastewater treatment (Zhao and Liu, 2016). 90% of the pollutants are removed through the biochemical section (Shi et al., 2020a). COD and NH 3 N in the influent are 2000 mg/L and 120 mg/L, and that in the effluent are 200 mg/L and 20 mg/L, respectively (Zheng et al., 2020).
In the process of coal gasification wastewater treatment, in order to achieve a better treatment effect, ozone oxidation, or catalytic ozone oxidation is often used in combination with biotechnology such as MBR and biological fluidized bed. The laboratory has studied the treatment effect of coaltogas wastewater by the combination of ...
In surface mining, the ground covering the coal seam (the overburden) is first removed to expose the coal seam for extraction. The elements of a surface mining operation are (1) topsoil removal and storage for later use, (2) drilling and blasting the strata overlying the coal seam, (3) loading and transporting this fragmented overburden material (called spoil), (4) drilling and blasting the ...
In short, there are the following six types of coal slime water treatment processes: 1. Direct flotation separation→ tailings coal concentration → water pressure filtration. This process can quickly realize the effective closedcircuit circulation of coal slime water, improve the utilization rate of clean coal recycling, and enhance the economic benefits of enterprises.
The process of pyrite oxidation, the role of bacteria and other factors, and its effects on water resources have been known for centuries ... Passive treatment of acidic coal mine drainage: the Anna S Mine passive treatment complex. Mine Water Environ., 29 (2010), pp. 165175, /s.
In conclusion, multiple lines of evidence were provided to clarify the regulation mechanism of microbial metabolism on the efficient degradation of aromatic compounds for biochemical treatment process of coal chemical wastewater in pilot scale. The results laid a good foundation for realizing the harmless treatment of coal chemical wastewater.
Precombustion treatment. Refined coal is the product of a coalupgrading technology that removes moisture and certain pollutants from lowerrank coals such as subbituminous and lignite (brown) coals. ... Capturing carbon dioxide emissions from coal is a process in which a relatively pure stream of carbon dioxide (CO 2) from industrial sources ...
What is coal pyrolysis: coal pyrolysis involves subjecting coal to high temperature of 400450°C, in the absence of oxygen. When oxygen or steam is present, coal will start burning, and the process is no longer known as pyrolysis but rather referred as combustion and gasification. The benefits of coal pyrolysis are enormous and are listed ...
tivated sludge from a coal chemical wastewater treatment process was reported by using the prepared CuCe/Al2O3 catalyst. The effects of the catalyst dosage, reaction temperature and time, and the initial oxygen pressure on the reactivity of the system were investigated. In addition, the characteristics of the produced liquid and solid were ...
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