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Coal-washing wastewater is the residual produced by the coal industry, which may represent a high risk of serious environmental problems worldwide. However, prevailing coal-washing treatment processes are hardly ideal for achieving the goal of solid–liquid separation due to the wastewater's extremely stable physicochemical …
Other researchers have shown that hydrothermal processes cause the rapid dehydrochlorination of polyvinyl chloride at temperatures of approximately 250–350 °C [4], thus producing HCl hydrochloride and polyenes. As compared with traditional waste treatment technology, this is a positive side effect of the hydrothermal process.
Coal chemical wastewater (CCW) is a type of refractory industrial wastewater, and its treatment has become the main bottleneck restricting the sustainable …
Due to the highly complex nature of FGD wastewater, several stages are required to treat wastewater blowdown from the FGD scrubber to meet NPDES requirements for surface water discharge. This …
The scarcity of water resources and environmental pollution in the coal mining areas of western China severely restricts high-quality mine development and construction there. Treating mine water as a valuable unconventional water resource for large-scale processing and efficient utilization is a crucial approach. This paper …
This study aimed to develop Refuse Derived Fuel (RDF) with high Calorific Value (CV) from mixed hazardous wastes and biomass. The potential utilization of newly developed RDF in cement production as a fuel substitute for coal has been investigated. In this work, five types of mixed hazardous industrial wastes (rubber waste, mixed waste, …
Management of coal mining and coal processing wastes, particularly of high sulfur coals, can generate excessive amounts of sulfate (SO 4 2−) and chloride (Cl …
Treatment of Coal Washery Waste The major pollutant of the coal washery is the suspended solids. As such this waste is usually treated in a clarifier with or without coagulation.
The aim of this research was to evaluate the technoeconomic prospect of hydrochar production through co-hydrothermal carbonization of coal waste (CW) and food waste (FW). A process flow diagram was developed that considered seven reactors, six pumps, and other necessary equipment for producing 49,192 kg/h hydrochar. Three …
Coal fly ash is one of the potential waste materials for adsorption applications. Coal is a significant source of power across the globe, and a considerable portion of it (30–40 %) is used to generate electricity. Coal-fired power plants generate metric tons of fly ash (FA), bottom ash, and carcinogens [11], [12]. Ash is produced at a …
The treatment of coal gasification wastewater (CGW) poses a serious challenge on the sustainable development of the global coal industry. The CGW contains a broad spectrum of high-strength recalcitrant substances, including phenolic, monocyclic and polycyclic aromatic hydrocarbons, heterocyclic nitrogenous compounds and long chain …
1. Introduction. Coal gasification slag (CGS) is a solid waste produced during coal gasification [1] and gasification converts flammable components into combustible gases such as H 2, CO, CH 4 [2].Coal gasification technology is considered as a major technology for efficient and clean coal utilization [3].Gasification techniques are …
AC, including granular activated carbon (GAC) and powdered activated carbon (PAC), was the first to be used for enhancing biological treatment of CCW. AC …
Tertiary Treatment. Tertiary treatment is the third and final process. During tertiary treatment, wastewater flows through several filter beds composed of gravel, sand and anthracite coal to remove small suspended solids. The water flows through serpentine tanks where chlorine is used to kill any remaining viruses or bacteria.
The coal chemical industry wastewater can be divided into four categories: coal coking wastewater, coal gasification wastewater, coal liquefaction wastewater, and coal pyrolysis wastewater (CPW). Research on CPW is very important because coal pyrolysis is a core coal utilization technology for main coal conversion processes like …
The basic requirements for coal chemical wastewater treatment and reuse include three aspects: (1) clearly identifying the sources of wastewater and categorically collecting them, (2) implementing graded treatment based on water quality, and (3) specifying pathways for reuse based on water quality after wastewater treatment. The …
Coal gangue is a rock formed by co deposition with coal during the coal formation process. It is a solid waste discharged during excavation, mining, and coal washing processes [12]. At present, China has accumulated over 50 billion tons of coal gangue, and an additional about 500 to 800 million tons of coal gangue will be …
A number of water treatment systems are in place, mainly in the gold, coal, nickel, and copper industries. The systems are installed at operational, industrial scale plants, where mine drainage or pit water, waste water from tailing storage facilities, and even "produced water" from coal seam methane production are treated.
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., …
This article reviews several standard processes for denitrification and the recovery of nitrogen. The review includes the advantages and disadvantages of the different techniques and the factors that affect each process. Among them, biological methods seem to be the most efficient treatment processes, with >90% removal efficiency.
Finally, as with all coal-fueled plants, a secondary effluent stream is run-off from the coal and slag storage areas and the process area. TECO Energy, the owner/operator of the Polk plant indicates that control of this effluent can involve significant effort and cost. 7 Waste Water Treatment
Combining coal waste and sewage sludge, which are then put through a thermal process, is a viable way to reduce energy consumption and pollution.
The most conventional method for coal waste disposal is using TSFs where there are high potential areas to cause serious environmental problems. In order to reclaim or reuse water for processing operations, slurries are reserved on the top surface of TSFs. ... Metallurgical coals of higher market value are normally treated in fines treatment ...
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: …
Processing of energy resources such as coal, oil or gas, as in the case of metals, produces liquid waste, and solid waste - drill cuttings. As a result of coal mining, a waste rock, in the case of coal constitute about 30% (Kopacz, 2015), and the rest of the generated waste are tailings containing gangue and large amounts of water, which is ...
The three waste types were wastewater treatment sludge, wood waste and dairy waste. The wastes contained approximately 1.3–2% total solids (TS) and 20 400–26 700 mg/l chemical oxygen demand (COD).
Sustainable wastewater technologies minimize mining's environmental footprint. Mining for some minerals, including coal, has been diminishing globally due to increased financial, social, and environmental pressures, …
For example, when we pyrolyze coal, at around 300–400°C, condensable coal-tar is released along with other volatiles due to reaction type (i), but at the same time, steps (ii) and (iii) occur in the remaining solid. ... allowing only few of the aforementioned steps to complete. For treatment of waste, for example, the process is terminated ...
Management of coal mining and coal processing wastes, particularly of high sulfur coals, can generate excessive amounts of sulfate (SO4 2−) and chloride (Cl−) in mine drainage that are known to negatively impact quality of both surface and ground water. The U.S. Environmental Protection Agency provides guidance to states on allowable SO4 2− …
A pile of coal in front of industrial chimneys. Credit: Waldo Swiegers/Bloomberg Creative Photos/ Getty Images. Lire en Francais. Combining coal waste and sewage sludge, which are then put through ...