An advanced anaerobic expanded granular sludge bed (AnaEG) for the treatment of coal gasification wastewater

RSC Advances ◽  
2014 ◽  
Vol 4 (101) ◽  
pp. 57580-57586 ◽  
Author(s):  
Chunjie Li ◽  
Salma Tabassum ◽  
Zhenjia Zhang
Keyword(s):  
Industrial Wastewater ◽  
Coal Gasification ◽  
State Of The Art ◽  
Granular Sludge ◽  
Anaerobic Treatment ◽  
High Toxicity ◽  
Coal Gasification Wastewater

A state-of-the-art advanced anaerobic expanded granular sludge bed (AnaEG) was developed for the anaerobic treatment of coal gasification wastewater (typical industrial wastewater with poor biodegradability and high toxicity).

Degradation of Carcinogenic Hydroquinone in Coal Gasification Wastewater by Using Anaerobic Shaker Test

2014 ◽  
Vol 1049-1050 ◽  
pp. 39-43 ◽  
Author(s):  
Qin Hong Ji ◽  
Salma Tabassum ◽  
Chun Feng Chu ◽  
Chun Jie Li ◽  
Zhen Jia Zhang
Keyword(s):  
Industrial Wastewater ◽  
Coal Gasification ◽  
Anaerobic Sludge ◽  
Phenol Removal ◽  
Operational Parameters ◽  
Pollutant Degradation ◽  
Refractory Compounds ◽  
Coal Gasification Wastewater ◽  
Hydrolysis Acidification ◽  
Wastewater Samples

Coal gasification wastewater, as a typical industrial wastewater has poor biodegradability and high toxicity. In this paper, simple anaerobic shaker test was conducted to investigate the degradation of hydroquinone in coal gasification wastewater. Anaerobic sludge shaker test were run for 27, 50 and 73 days, the phenol concentration were adjusted to 300 mg/L and 500 mg/L with pH 7.5, respectively. The experimental results also showed that this system could effectively deal with COD and phenol removal and remain in a stable level when the operational parameters altered while the hydrolysis acidification at 45h is appropriate. Organics degradation and transformation of anaerobic coal gasification wastewater samples at 12h, 24h, 36h, 48h, and 60h were analyzed by GC/MS and it was found that hydrolysis acidification played an important role in degradation of methyl phenol, hydroquinone and refractory compounds. Therefore, the results illustrated that the simple anaerobic shaker process is an easy way for pollutant degradation and treat coal gasification wastewater effectively.

Anaerobic Treatment of Coal Gasification Wastewater

1987 ◽  
Vol 19 (1-2) ◽  
pp. 229-236 ◽  
Author(s):  
Makram T. Suidan ◽  
Peter Fox ◽  
John T. Pfeffer
Keyword(s):  
Activated Carbon ◽  
Coal Gasification ◽  
Physical Adsorption ◽  
Oxygen Demand ◽  
Granular Activated Carbon ◽  
Anaerobic Treatment ◽  
Partial Replacement ◽  
Anaerobic Culture ◽  
Second Stage ◽  
Coal Gasification Wastewater

A sequence of unit processes consisting of a berl-saddle-packed anaerobic filter, an expanded-bed, granular activated carbon anaerobic reactor and an activated sludge nitrification system was employed for the treatment of synthetically prepared coal gasification wastewater. After acclimation, the coal gasification wastewater was fed to the treatment process train at three different chemical oxygen demand levels; these were 1,513. 3,027, and 7,567 mg/ℓ, respectively. No biological activity was observed in the first-stage filter, while excellent removal of organic matter was achieved in the second and third stages of the treatment systems. However, toxicity to the anaerobic culture in the second-stage reactor was observed during the second and third loading levels. This toxicity was overcome by employing a partial replacement schedule of the granular activated carbon medium in the reactor. This study represents an example of how biodegradation and physical adsorption may be successfully combined during the treatment of wastewaters containing toxic or inhibitory substances.

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

2018 ◽  
Vol 2018 ◽  
pp. 1-9
Author(s):  
Chunrong Wang ◽  
Qi Zhang ◽  
Longxin Jiang ◽  
Zhifei Hou
Keyword(s):  
Biological Treatment ◽  
Coal Gasification ◽  
Organic Materials ◽  
Organic Pollutant ◽  
High Toxicity ◽  
Toc Removal ◽  
Dissolved Organic Matters ◽  
Before And After ◽  
Coal Gasification Wastewater ◽  
By Products

The 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, UV254, UV-Vis, and 3D EEM were employed to quantitatively and qualitatively analyze organic materials in each part of the fractionated samples. The 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. The UV254 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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