Determination of biological removal of recalcitrant organic contaminants in coal gasification waste water

Abstract

Coal gasification waste water treatment needed a sustainable and affordable plan to eliminate the organic contaminants in order to lower the potential environmental and human health risk. In this paper, a laboratory-scale anaerobic-aerobic intermittent system carried out 66 operational cycles together for the treatment of coal gasification waste water and the removal capacity of each organic pollutant. Contaminants included phenols, carboxylic acids, long-chain hydrocarbons, and heterocyclic compounds, wherein the relative content of phenol is up to 57.86%. The long-term removal of 77 organic contaminants was evaluated at different hydraulic retention time (anaerobic24 h + aerobic48 h and anaerobic48 h +aerobic48 h). Contaminant removal ranged from no measurable removal to near-complete removal with effluent concentrations below the detection limit. Contaminant removals followed one of four trends: steady-state removal throughout, increasing removal to steady state (acclimation), decreasing removal, and no removal. Organic degradation and transformation in the reaction were analysed by gas chromatography/mass spectrometry technology.

Preparation and Property Characterization of Eu2SmSbO7/ZnBiEuO4 Heterojunction Photocatalysts and Photocatalytic Degradation of Chlorpyrifos under Visible Light Irradiation

“…After preliminary physical filtration, some methods have been invented for the degradation of small particle organic pollutants that are easily dissolved in water, such as chlorination, electrocatalysis, and anaerobic-aerobic biological treatment [23][24][25][26][27][28][29][30][31]. All the above methods have some drawbacks.…”

Slurrying Property and Mechanism of Coal–Coal Gasification Wastewater–Slurry

“…Statistics indicate that the conversion of 1 ton of coal emits ∼0.8–1.1 tons of wastewater . Such wastewater generally contains high amounts of toxic substances, such as phenols, ammonia, cyanide, thiocyanide, and heterocyclic and polycyclic aromatic compounds. − The components of different wastewater sources vary significantly, depending on coal type and gasification. Consequently, the treatment of coal gasification wastewater has become one of the challenging problems in industrial wastewater disposal.…”