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.

scholarly journals Two-stage air stripping combined with hydrolysis acidification process for coal gasification wastewater pretreatment

2019 ◽  
Vol 79 (11) ◽  
pp. 2185-2194 ◽  
Author(s):  
Xiurong Chen ◽  
Xiaoli Sun ◽  
Xiaoxiao Wang ◽  
Peng Xu ◽  
Chenchen Yang ◽  
...  
Keyword(s):  
Biological Treatment ◽  
Coal Gasification ◽  
Ammonium Ion ◽  
Air Stripping ◽  
Second Stage ◽  
Whole Process ◽  
Volatile Phenol ◽  
Coal Gasification Wastewater ◽  
Gas Washing ◽  
Hydrolysis Acidification

Abstract Coal gasification wastewater is mainly from gas washing, condensation and purification processes in the gas furnace with high NH3-N (nitrogen in water in the form of free ammonia (NH3) and ammonium ion (NH4+)), TN (total nitrogen) and refractory organics content, which will inhibit the subsequent biological treatment. The ‘air stripping – hydrolysis acidification – air stripping’ process was proposed as the pretreatment for coal gasification wastewater to improve the biodegradability and nitrogen removal, which could reduce the subsequent biological treatment load. The first-stage air stripping process before hydrolysis acidification could achieve a significant removal of NH3-N (97.0%) and volatile phenol (70.0%), reducing the corresponding toxicity on hydrolysis acidification. The group with air stripping had more abundant microbial communities and a more effective organic degradation performance in hydrolysis acidification than that without air stripping. The second-stage air stripping removed NH3-N released from hydrolysis acidification, and significantly reduced the TN concentration in effluent. The whole process achieved a TN removal from 2,000 ± 100 mg/L to 160 ± 80 mg/L, and a total phenols removal from 700 ± 50 mg/L to 80 ±20 mg/L.

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).

scholarly journals Enhanced Degradation of Phenolic Compounds in Coal Gasification Wastewater by Methods of Microelectrolysis Fe-C and Anaerobic-Anoxic—Oxic Moving Bed Biofilm Reactor (A2O-MBBR)

Processes ◽  
2020 ◽  
Vol 8 (10) ◽  
pp. 1258
Author(s):  
Do Tra Huong ◽  
Van Tu Nguyen ◽  
Xuan Linh Ha ◽  
Hien Lan Nguyen Thi ◽  
Thi Thoa Duong ◽  
...  
Keyword(s):  
Coal Gasification ◽  
Combined Treatment ◽  
Biofilm Reactor ◽  
Phenol Removal ◽  
Joint Stock Company ◽  
N Content ◽  
Total N ◽  
Moving Bed ◽  
Internal Electrolysis ◽  
Coal Gasification Wastewater

The coal gasification wastewater figures prominently among types of industrial effluents due to its complex and phenolic composition, posing great difficulty for conventional water treatment processes. Since the coking wastewater is toxic and mutagenic to humans and animals, treatment of coal gasification wastewater is genuinely necessary. In this study, we established a lab-scale A2O (Anaerobic-Anoxic—Oxic) with moving bed biological reactor (MBBR) system and evaluated some water indicators of wastewater pretreated with internal electrolysis, of wastewater output of the established A2O-MBBR system, and of the wastewater treated by the combination thereof. The wastewater was taken from a coking plant at Thai Nguyen Iron and Steel Joint Stock Company in Vietnam. COD, BOD5, NH4+-N, phenol, and pH of the input coal gasification wastewater were 2359, 1105, 319, 172 mg/L, and 8 ± 0.1, respectively. The conditions of internal electrolysis were as follows: 720 min of reaction time, pH = 4, 25 g/L Fe-C dosage, and 100 mg/L PAM dosage. After internal electrolysis process, the removal of COD, BOD5, NH4+-N, and phenol were 53.7%, 56.7% 60.5%, and 73.3%, respectively. After 24 h of treatment, the treatment efficiencies of the combined treatment process are as follows: 100% phenol removal, 71.3% of TSS removal; 97.7% reduction of BOD5, and 97.1% reduction of COD; total N content reduced by 97.6%; total P content decreased by 81.6%; and NH4+-N content decreased by 97.5%. All above indicators after treatment have met QCVN 52: 2017/BTNMT (column A) Vietnamese standard for steel industry wastewater.

Mesoporous lignite-coke as an effective adsorbent for coal gasification wastewater treatment

2017 ◽  
Vol 3 (1) ◽  
pp. 169-174 ◽  
Author(s):  
Hongguang An ◽  
Zhenqiang Liu ◽  
Xiaoxin Cao ◽  
Jilin Teng ◽  
Wenhua Miao ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Wastewater Treatment ◽  
High Molecular Weight ◽  
Coal Gasification ◽  
Refractory Compounds ◽  
Coal Gasification Wastewater

Mesoporous lignite-coke as an effective adsorbent for high molecular weight refractory compounds in coal gasification wastewater treatment.

Process Simulation and Optimization on Phenol Extraction for Coal-Gasification Wastewater

2012 ◽  
Vol 550-553 ◽  
pp. 2349-2353 ◽  
Author(s):  
Chu Fen Yang ◽  
Jian Wei Guo ◽  
Shi Ying Yang ◽  
Guan Feng Wei
Keyword(s):  
Process Parameters ◽  
Coal Gasification ◽  
Phenol Removal ◽  
Solvent Ratio ◽  
Reflux Ratio ◽  
High Concentration ◽  
Residual Solvent ◽  
Simulation And Optimization ◽  
Phenol Extraction ◽  
Coal Gasification Wastewater

Coal-gasification wastewater is an industrial toxic wastewater with high concentration of phenols. To provide process parameters for industrial practice, simulation and optimization were carried out on the phenol removal process for coal-gasification wastewater which included phenol extraction, solvent distillation and residual solvent stripping. Calculation results showed that the optimized process parameters were as the following. When solvent ratio was 1:6, after four-stage extraction by methyl isobutyl ketone, the concentration of phenols in the wastewater can be reduced to below 200mg/L from 5000mg/L. While in the solvent distillation column, to make the solvent recycling usable and cut down solvent consumption, the column stages was recommended as 15, reflux ratio R as 0.1360, and feed stage as 10. Moreover, to recover the residual solvent in the wastewater, the number of theoretical stages for the stripper was proposed as 5, and distillate rate as 2388kg/hr.

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