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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School of Environmental Science and Engineering, Jiangsu Provincial Key Laboratory of Environmental Science and Engineering, Suzhou University of Science and Technology, Suzhou 215009, China
Jiangsu Key Laboratory of Anaerobic Biotechnology, School of Environment and Civil Engineering, Jiangnan University, Wuxi 214122, China
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
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.