Advanced treatment of biologically pretreated coal gasification wastewater using a novel expansive flow biological intermittent aerated filter process with a ceramic filler from reused coal fly ash

Zhuang, Haifeng; Shan, Shengdao; Fang, Chengran; Yuan, Xiaoli

doi:10.1039/c6ra01638c

Cited by 16 publications

(2 citation statements)

References 23 publications

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“…However, the main characteristics of the effluents after biological treatment were as follows: 100-200 mg·L −1 of COD, 0.01-0.08 of BOD 5 /COD ratio (B/C), 40-70 mg·L −1 of total nitrogen (TN), 10-20 mg·L −1 of NH 4 + -N, and 90-120 mg·L −1 of TOC [13][14][15][16]. Moreover, most studies only used simple indexes to express the characteristics of LCGW, and none have analyzed the effects of qualities on treatment process or the transformation of organic compounds during treatment.…”

Section: Introductionmentioning

confidence: 99%

The Organic Pollutant Characteristics of Lurgi Coal Gasification Wastewater before and after Ozonation

Wang

Zhang

Jiang

et al. 2018

Journal of Chemistry

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e effluent of distilled and extracted Lurgi coal gasification wastewater has been found to have low biodegradability and high toxicity, which inhibits further biodegradation. However, ozonation enhances the biodegradability and reduces the toxicity of this effluent, enabling further biological treatment and increased removal of organic materials. In this study, the dissolved organic matters in Lurgi coal gasification wastewater were isolated into six classes by resin adsorbents, after which TOC, UV 254 , UV-Vis, and 3D EEM were employed to quantitatively and qualitatively analyze organic materials in each part of the fractionated samples.e HoA and HiN fraction accounted for large amounts of the Lurgi coal gasification wastewater, and their TOC values were about 380.21 mg·L −1 and 646.84 mg·L −1 , respectively. After ozonation, the TOC removal rates of HoA and HiN reached 42.85% and 67.13%, respectively. e UV 254 of HoA was basically stable before and after ozonation, while that of HiN increased continuously because a portion of the humic macromolecular organic materials in HoA was oxidized to HiN. Additionally, UV-Vis analysis revealed that the larger molecular organics of HoA were oxidized during ozonation, resulting in high biodegradability. Finally, the 3D EEM spectra indicated that the macromolecular organics were oxidized to smaller molecules with the degradation of soluble microbial by-products.

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Section: Introductionmentioning

confidence: 99%

The Organic Pollutant Characteristics of Lurgi Coal Gasification Wastewater before and after Ozonation

Wang

Zhang

Jiang

et al. 2018

Journal of Chemistry

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“…In addition, another genus identified in our reactors (Truepera sp.) was previously found in biological filter performing simultaneous nitrification and denitrification [165], and, more interestingly, also detected during cathodic denitrification [166] and performing nitrite reduction in BES [167].…”

Section: Community Structure Assessmentmentioning

confidence: 92%

Microbial electrochemical systems for nitrate removal from diluted streams

Sander¹

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Increased concentrations of nitrogen compounds comprise one important factor contributing to deterioration of aquatic systems, both engineered and natural environments. In engineered Recirculating Aquaculture Systems (RAS), fish excretion and the addition of excess feed lead to build up of ammonium, which is further converted to less toxic nitrate within a (biological) nitrification unit. Although nitrate can accumulate to concentrations higher than 500 mg L -1 NO3 --N, it is suggested that its concentration should not overcome 50 mg L -1 NO3 --N in freshwater cultures and 100 mg L -1 NO3 --N in seawater cultures. Furthermore, the increased environmental regulations and licencing requirements have further imposed considerably stricter limits for discharge of aquaculture effluents to natural environments (i.e. <3 mg L -1 as Total Nitrogen in Queensland prawn farms). Similarly, other industrial activities and commissioned domestic wastewater treatment plants are also required to treat their wastewater streams to very low (diluted) concentrations of nitrogen before discharging them into natural environments. Therefore, either for recirculation of aquaculture water streams or for discharge purposes of various types of wastewaters, it is recommended that the concentration of nitrogen compounds should be monitored and controlled at low levels.Since the organic matter present in wastewaters is generally not sufficient to enable complete biological heterotrophic denitrification, typical denitrification processes require addition of an external carbon source (e.g. methanol). Recently, bioelectrochemical cathodic denitrification have been proposed as an alternative to organic matter addition, providing electrons through an inert conductive surface (cathode) directly to a biofilm performing (autotrophic) denitrification. Furthermore, electrons can be generated abiotically by splitting water, which simultaneously oxygenates the water, providing additional benefits for water reuse in aquaculture systems.Thus, the overall aim of this research project is to develop a Bioelectrochemical system as an alternative technology for denitrification and simultaneous oxygen generation in recirculating streams, which will enable the maintenance of diluted streams with low levels of nitrogen either for recirculation or discharge purposes. Furthermore, the technology should also be applicable as a polishing mechanism for denitrification from other diluted ii streams containing low levels of nitrate, such as secondary (treated) effluents from activated sludge systems.Since Dissimilatory Nitrate Reduction to Ammonium (DNRA) can be considered an undesired competitive pathway during cathodic denitrification, it is important to demonstrate and quantify the occurrence of this pathway. To assess this phenomenon, a carbon cloth cathodic electrode was inoculated with a mix culture denitrifying microbial community and poised at -0.9 V vs. standard hydrogen electrode (SHE). Results showed that more than 40% of nitrogen added as nitrate was co...

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Performance and microbial community analysis of bio-electrocoagulation on simultaneous nitrification and denitrification in submerged membrane bioreactor at limited dissolved oxygen

Dong

Qian

et al. 2018

Bioresource Technology

115

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Advanced treatment of biologically pretreated coal gasification wastewater using a novel expansive flow biological intermittent aerated filter process with a ceramic filler from reused coal fly ash

Abstract: A novel expansive flow biological intermittent aerated filter (BIAF) process was employed for the advanced treatment of real biologically pretreated coal gasification wastewater (CGW) which had poor biodegradability and a low carbon/nitrogen ratio.

Cited by 16 publications

References 23 publications

The Organic Pollutant Characteristics of Lurgi Coal Gasification Wastewater before and after Ozonation

The Organic Pollutant Characteristics of Lurgi Coal Gasification Wastewater before and after Ozonation

Microbial electrochemical systems for nitrate removal from diluted streams

Performance and microbial community analysis of bio-electrocoagulation on simultaneous nitrification and denitrification in submerged membrane bioreactor at limited dissolved oxygen

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