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)
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 gasifi...
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doaj-6438aa4411754f9aaaa6ff71f3fb2f042020-11-25T03:58:28ZengMDPI AGProcesses2227-97172020-10-0181258125810.3390/pr8101258Enhanced Degradation of Phenolic Compounds in Coal Gasification Wastewater by Methods of Microelectrolysis Fe-C and Anaerobic-Anoxic—Oxic Moving Bed Biofilm Reactor (A2O-MBBR)Do Tra Huong0Van Tu Nguyen1Xuan Linh Ha2Hien Lan Nguyen Thi3Thi Thoa Duong4Duy Chinh Nguyen5Hong-Tham Nguyen Thi6Thai Nguyen University of Education, Thai Nguyen University, Thai Nguyen Province 250000, VietnamInstitute of Chemistry and Materials, Institute of Military Science and Technology, Hanoi City 100 000, VietnamInternational School, Thai Nguyen University, Thai Nguyen 250000, VietnamThai Nguyen University of Education, Thai Nguyen University, Thai Nguyen Province 250000, VietnamThai Nguyen University of Education, Thai Nguyen University, Thai Nguyen Province 250000, VietnamNTT Hi-Tech Institute, Nguyen Tat Thanh University, Ho Chi Minh City 700000, VietnamNTT Hi-Tech Institute, Nguyen Tat Thanh University, Ho Chi Minh City 700000, VietnamThe 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, BOD<sub>5</sub>, NH<sub>4</sub><sup>+</sup>-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, BOD<sub>5</sub>, NH<sub>4</sub><sup>+</sup>-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 BOD<sub>5</sub>, and 97.1% reduction of COD; total N content reduced by 97.6%; total P content decreased by 81.6%; and NH<sub>4</sub><sup>+</sup>-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.https://www.mdpi.com/2227-9717/8/10/1258internal electrolysisFe-C materialscoal gasification wastewaterA2O-MBBR |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Do Tra Huong Van Tu Nguyen Xuan Linh Ha Hien Lan Nguyen Thi Thi Thoa Duong Duy Chinh Nguyen Hong-Tham Nguyen Thi |
spellingShingle |
Do Tra Huong Van Tu Nguyen Xuan Linh Ha Hien Lan Nguyen Thi Thi Thoa Duong Duy Chinh Nguyen Hong-Tham Nguyen Thi 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 internal electrolysis Fe-C materials coal gasification wastewater A2O-MBBR |
author_facet |
Do Tra Huong Van Tu Nguyen Xuan Linh Ha Hien Lan Nguyen Thi Thi Thoa Duong Duy Chinh Nguyen Hong-Tham Nguyen Thi |
author_sort |
Do Tra Huong |
title |
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) |
title_short |
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) |
title_full |
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) |
title_fullStr |
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) |
title_full_unstemmed |
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) |
title_sort |
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) |
publisher |
MDPI AG |
series |
Processes |
issn |
2227-9717 |
publishDate |
2020-10-01 |
description |
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, BOD<sub>5</sub>, NH<sub>4</sub><sup>+</sup>-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, BOD<sub>5</sub>, NH<sub>4</sub><sup>+</sup>-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 BOD<sub>5</sub>, and 97.1% reduction of COD; total N content reduced by 97.6%; total P content decreased by 81.6%; and NH<sub>4</sub><sup>+</sup>-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. |
topic |
internal electrolysis Fe-C materials coal gasification wastewater A2O-MBBR |
url |
https://www.mdpi.com/2227-9717/8/10/1258 |
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