Iron foam coupled hydrolysis acidification for trichloroacetaldehyde treatment: strengthening characteristics and mechanism

2021 ◽  
pp. 126047
Author(s):  
Xiangmiao Tian ◽  
Xiaoguang Jin ◽  
Jie Wang ◽  
Zhiqiang Shen ◽  
Yuexi Zhou ◽  
...  
Keyword(s):  
Hydrolysis Acidification

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.

Application of Fenton sludge coupled hydrolysis acidification in pretreatment of wastewater containing PVA: Performance and mechanisms

2022 ◽  
Vol 304 ◽  
pp. 114305
Author(s):  
Yanqiong Wang ◽  
Hongwu Wang ◽  
Hui Jin ◽  
Xiaoqin Zhou ◽  
Hongbin Chen
Keyword(s):  
Hydrolysis Acidification

scholarly journals Newly Designed Hydrolysis Acidification Flat-Sheet Ceramic Membrane Bioreactor for Treating High-Strength Dyeing Wastewater

2019 ◽  
Vol 16 (5) ◽  
pp. 777 ◽  
Author(s):  
Yue Jin ◽  
Dunqiu Wang ◽  
Wenjie Zhang
Keyword(s):  
Membrane Bioreactor ◽  
Ceramic Membrane ◽  
Removal Rate ◽  
High Strength ◽  
Organic Loading Rate ◽  
Pseudomonas Sp ◽  
Dyeing Wastewater ◽  
Flat Sheet ◽  
Cost Effective Treatment ◽  
Hydrolysis Acidification

Cost-effective treatment of dyeing wastewater remains a challenge. In this study, a newly designed hydrolysis acidification flat-sheet ceramic membrane bioreactor (HA-CMBR) was used in treating high-strength dyeing wastewater. The start-up phase of the HA-CMBR was accomplished in 29 days by using cultivated seed sludge. Chemical oxygen demand (COD) removal rate reached about 62% with influent COD of 7800 mg/L and an organic loading rate of 7.80 kg-COD/(m3·d). Chromaticity removal exceeded 99%. The results show that the HA-CMBR has good removal performance in treating dyeing wastewater. The HA-CMBR could run with low energy consumption at trans-membrane pressure (TMP) <10 kPa due to the good water permeability of the flat-sheet ceramic membrane. New strains with 92%–96% similarity to Alkalibaculum bacchi, Pseudomonas sp., Desulfovibrio sp., and Halothiobacillaceae were identified in the HA-CMBR. Microbial population analysis indicated that Desulfovibrio sp., Deltaproteobacteria, Halothiobacillaceae, Alkalibaculum sp., Pseudomonas sp., Desulfomicrobium sp., and Chlorobaculum sp. dominated in the HA-CMBR.

Biological pretreatment of tannery wastewater using a full-scale hydrolysis acidification system

2014 ◽  
Vol 95 ◽  
pp. 41-45 ◽  
Author(s):  
Ke Wang ◽  
Weiguang Li ◽  
Xujin Gong ◽  
Xiangkun Li ◽  
Weijie Liu ◽  
...  
Keyword(s):  
Full Scale ◽  
Tannery Wastewater ◽  
Biological Pretreatment ◽  
Hydrolysis Acidification

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.

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