ORIGINAL RESEARCH
The Effect of Anaerobic Co-Substrate on Removal of COD, Phenol and Methane Production in Coal Gasification Wastewater Treatment
Yajie Li 1, 2  
,   Lingyu Liu 1,   Qingshui Wang 1,   Jiazi Wu 1,   Tonghui Liu 1,   Yaoliang Hong 1,   Wenru Liu 1
,   Juan Mei 1  
 
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1
School of Environmental Science and Engineering, Jiangsu Provincial Key Laboratory of Environmental Science and Engineering, Suzhou University of Science and Technology, Suzhou 215009, China
2
Jiangsu Key Laboratory of Anaerobic Biotechnology, School of Environment and Civil Engineering, Jiangnan University, Wuxi 214122, China
CORRESPONDING AUTHOR
Juan Mei   

Suzhou University of Science and Technology, China
Submission date: 2020-02-07
Final revision date: 2020-04-06
Acceptance date: 2020-04-09
Online publication date: 2020-07-13
Publication date: 2020-08-05
 
Pol. J. Environ. Stud. 2020;29(6):4175–4181
 
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ABSTRACT
In this paper, potato starch wastewater (PSW) was adopted as anaerobic co-substrate added in influent of coal gasification wastewater (CGW). The control anaerobic biofilters (AF) and supplemented AF were investigated in our research. Without co-digestion, both of the COD and total phenol removal rates were only 30%, respectively. However, adding PSW (COD = 1000 mg/L) as co-substrate meanwhile increasing concentration of CGW in influent step by step from phase 1 to phase 3. In phase 1 and 2, the effluent COD and total phenol reached 1000 mg/L and 50 mg/L, respectively. Further increasing COD of PSW to 1500 mg/L in phase 4, the removal rates of COD and total phenol almost reached 50%, respectively. The methane production rate was increased to 260 mLCH4/gCOD/d. In order to further improve the treatment efficiency in co-digestion, the two-stage AFs were adopted in our next study, the result indicated that with adding PSW (COD = 1500 mg/L) in the first stage AF (R1) and extending the HRT of R1 to 48 h, both of the total removal rates of COD and total phenol almost reached 75%, respectively, meanwhile methane production rate of the second AF (R2) rising to 300 mLCH4/gCOD/d in phase 4.
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ISSN:1230-1485