EFFECTS OF INITIAL ALKALINITY AND TEMPERATURE ON ANAEROBIC FERMENTATION PROCESS OF PIGGERY WASTEWATER

LIAO Jie; XIE Wei; LIU Chaoxiang; FAN Hongyong

doi:10.13205/j.hjgc.202302008

Volume 41 Issue 2

Feb. 2023

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LIAO Jie, XIE Wei, LIU Chaoxiang, FAN Hongyong. EFFECTS OF INITIAL ALKALINITY AND TEMPERATURE ON ANAEROBIC FERMENTATION PROCESS OF PIGGERY WASTEWATER[J]. ENVIRONMENTAL ENGINEERING , 2023, 41(2): 53-59,65. doi: 10.13205/j.hjgc.202302008

Citation:

LIAO Jie, XIE Wei, LIU Chaoxiang, FAN Hongyong. EFFECTS OF INITIAL ALKALINITY AND TEMPERATURE ON ANAEROBIC FERMENTATION PROCESS OF PIGGERY WASTEWATER[J]. ENVIRONMENTAL ENGINEERING , 2023, 41(2): 53-59,65. doi: 10.13205/j.hjgc.202302008

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EFFECTS OF INITIAL ALKALINITY AND TEMPERATURE ON ANAEROBIC FERMENTATION PROCESS OF PIGGERY WASTEWATER

doi: 10.13205/j.hjgc.202302008

1. The Key Laboratory of Water Resources Utilization and Protection of Xiamen, School of Environmental Science and Engineering, Xiamen University of Technology, Xiamen 361024, China;
2. School of Environmental and Safety Engineering, Fuzhou University, Fuzhou 350108, China;
3. School of Environmental and Municipal Engineering, Qingdao University of Technology, Qingdao 266033, China

Received Date: 2022-06-16
Available Online: 2023-05-25
Publish Date: 2023-02-01

Abstract

Abstract

The anaerobic fermentation process of piggery wastewater at different initial alkalinity levels (3503, 5500, 7500 mg/L, as CaCO₃) and temperature (20, 35, 50℃) was studied by sequential batch experiment. The characteristics of its influences on pH, volatile fatty acids, gas production, biogas slurry nutrients, heavy metal content, antibiotics and resistance genes were investigated. The results revealed that the initial alkalinity adjustment could delay the initiation of the hydrolysis and acidification stage of anaerobic fermentation, strengthen the process of acid production and increase total acid production. The highest pH maintenance ability was presented with the operation of the highest level of alkalinity. The initial alkalinity regulation was suitable for anaerobic fermentation at moderate and high temperature with the purpose of producing acid. 35℃ and 50℃ was conducive to releasing nutrients from fermentation substrates, and the highest nutrient concentration was (1365.14±124.38)~(1471.71±135.29) mg/L at 50℃. Anaerobic fermentation at 50℃ was more conducive to the reduction of soluble heavy metals (Cu,Zn) in biogas slurry, and the reduction ratios were (81.53±9.51)~(86.04±7.72)% and (96.48±8.73)~(97.81±10.29)%, respectively. Anaerobic fermentation could reduce the concentrations of antibiotics (oxytetracycline and norfloxacin) in biogas slurry, and the highest reduction rate was (14.61±1.39)~(56.26±5.24)% and (23.83±3.21)~(85.84±17.35)% at 50℃ compared with 20℃ and 35℃, respectively. The relative abundance of resistance genes were decreased at 50℃ and appropriate initial alkalinity regulation effectively. The results of this research could provide a reference for the optimization of the anaerobic fermentation process of livestock wastewater.
- alkalinity,
- temperature,
- anaerobic fermentation,
- piggery wastewater,
- antibiotic

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References(37)

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