coal waste treatment process

Physicochemical, structural analysis of coal discards (and …

The optimal combination methodology and response surface methodology were used to study the relationship between the important process parameters, namely …

Hydrothermal treatment of municipal solid waste into coal …

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).

Hydrothermal carbonization of biomass and waste: A …

The replacement of traditional and non-renewable resources by shifting towards renewable-based strategies is a strategy implemented by the European Union for a circular economy-based society. Among the various methods to produce renewable biofuels, hydrothermal carbonization is promising in terms of waste management. …

Management of coal processing wastes: studies on an …

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− …

Optimization modeling and mechanism discussion on …

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 …

Analysis and standardization of coal chemical wastewater treatment …

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 …

2.4. Gasification Process Aqueous Effluents/Wastewater

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

Technoeconomic analysis of co-hydrothermal carbonization of coal waste …

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 …

Constructed wetland as a green remediation …

The wastewater from underground coal gasification (UCG) process has extremely complex composition and high concentrations of toxic and refractory compounds including phenolics, aliphatic and …

Separation and Recovery of Valuable Carbon

Coal gangue (CG), an industrial solid waste with high contents of Li and Ga, has attracted the attention of researchers. However, the utilization of CG remains an economic challenge. Pre-enrichment of Li and Ga by flotation was carried out with a view to improving the comprehensive utilization of CG. Mineral composition, time-of-flight …

Overview of enhancing biological treatment of coal chemical …

AC, including granular activated carbon (GAC) and powdered activated carbon (PAC), was the first to be used for enhancing biological treatment of CCW. AC …

Coal-fired power plant desulfurization wastewater treatment process

Principles of Zero Discharge Treatment of Desulfurization Wastewater. 1) In addition to the desulfurization wastewater of coal-fired power plants, various types of wastewater can basically achieve "one water for multiple uses, cascade utilization" after treatment, and no waste water is discharged.

Coal-based adsorbents for water and wastewater treatment

Coal fly ash, a by-product of coal combustion, has been regarded as a problematic solid waste [50], [51], mainly due to the presence of potentially toxic trace elements (e.g. Cd, Cr, Ni, Pb) and organic compounds (e.g., polychlorinated biphenys, polycyclic aromatic hydrocarbons) [52].Its utilization has received a great deal of …

A comprehensive review of the pyrolysis process: from …

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 ...

Mechanical properties and micro characterization of coal …

Industrial solid waste coal gangue (CG) is used as the research object, and the mechanical activation-water washing pretreatment method was used to explore the feasibility of carbon removal by water washing and the improvement and microscopic mechanism of the treatment process on the cementitious activity of CG.

Modification and resource utilization of coal gasification slag …

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 …

CHARACTERISTICS AND IMPACT OF DIFFERENT INDUSTRIAL EFFLUENTS FROM COAL

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.

A review on the coal gasification wastewater treatment technologies

The 1977–2015 literature on treatment of the coal gasification 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 …

Mine Water Treatment, Resource Utilization and Prospects in Coal …

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 …

Overview of enhancing biological treatment of coal chemical …

Coal chemical wastewater (CCW) is a type of refractory industrial wastewater, and its treatment has become the main bottleneck restricting the sustainable …

Coal waste management practices in the USA: an overview

The coal processing waste consists of 20 % in-seam dilution and 80 % OSD, primarily from roof strata. The in-seam pyritic sulfur content is 2.6 %, organic …

Review on treatment technologies of coal gasification wastewater …

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., …

Processes | Special Issue : Advances in Solid Waste Treatment …

High-quality research articles on the various aspects of waste treatment technology and management are brought together, covering both the current status and remaining challenges. Topics include but are not limited to: Waste treatment technologies, including physical, chemical, thermal, and biological processes; Zero waste, markets, and policies;

The Water Treatment Process | Santa Clara Valley Water

At the Santa Teresa plant, the waste backwash water enters a mini-treatment plant to pre-clean it before it is pumped back to the starting point again. This will further reduce the possibility of parasites like giardia and cryptosporidium cycling back to the main treatment process. At the Rinconada plant, the waste backwash water is conveyed to ...

State of the art of biological processes for coal gasification

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 …

Coal and sewage waste process explored

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 ...

An Overview of Coal-Fired Power Plant FGD …

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 …

Coal and sewage waste process explored

Combining coal waste and sewage sludge, which are then put through a thermal process, is a viable way to reduce energy consumption and pollution.

Overview of Drinking Water Treatment Technologies | US …

Furthermore, this large volume concentrate stream is laden with removed contaminants, salts and dissolved solids and will require discharge or disposal. Also, the high pressures used in these treatment processes can result in significant energy consumption. Pre-treatment processes are frequently required to prevent membrane …

Waste management in the mining industry of metals ores, coal…

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 ...