Understanding and regulating the impact of tetracycline to the anaerobic fermentation of waste activated sludge

2021 ◽  
pp. 127929
Author(s):  
Dandan He ◽  
Jun Xiao ◽  
Dongbo Wang ◽  
Xuran Liu ◽  
Yifu Li ◽  
...  
Keyword(s):  
Activated Sludge ◽  
Anaerobic Fermentation ◽  
Waste Activated Sludge ◽  
The Impact

scholarly journals Effect of DEHP on SCFA Production by Anaerobic Fermentation of Waste Activated Sludge

2020 ◽  
Vol 2020 ◽  
pp. 1-12
Author(s):  
Rui Gong ◽  
Xiang Tang ◽  
Changzheng Fan ◽  
Baowei Zhang ◽  
Man Zhou
Keyword(s):  
Activated Sludge ◽  
Microbial Communities ◽  
Wastewater Treatment Plants ◽  
Anaerobic Fermentation ◽  
Total Yield ◽  
Short Chain Fatty Acids ◽  
Raw Material ◽  
Waste Activated Sludge ◽  
Diethylhexyl Phthalate ◽  
The Impact

Diethylhexyl phthalate (DEHP) is a common plasticizer in industrial production. Recently, environmental problems caused by microplastics have drawn wide attention. As the microplastics have a large specific surface area, the release rate of the plasticizer from the microplastics to the environment is accelerated. The DEHP in the wastewater enters the wastewater treatment plants (WWTPs) along with the urban pipeline. After DEHP enters the WWTPs, it may affect the anaerobic fermentation with waste activated sludge (WAS) as raw material. So far, there has been no study on the effect of DEHP on anaerobic fermentation of WAS. Our study focused on the impact of exogenous DEHP on WAS anaerobic fermentation, and the results showed that DEHP mainly affects the solubilization stage of sludge anaerobic digestion, but has no significant effect on other stages. It does not affect the total yield and composition of short-chain fatty acids (SCFA). However, DEHP inhibited the solubilization process of WAS anaerobic fermentation, which was mainly manifested by the changes of soluble protein and soluble polysaccharide in the system. The results of the analysis of microbial communities revealed that the addition of DEHP did not change the diversity of microbial communities, but caused a change in the abundance of microbial organisms. DEHP reduced the abundance of acetogen bacteria and increased the abundance of methanogens. This work provides some insights into WAS fermentation systems in the presence of DEHP and helps to gain a better understanding of the potential environmental hazards of microplastics.

scholarly journals Comparison of the impacts of thermal pretreatment on waste activated sludge using aerobic and anaerobic digestion

2018 ◽  
Vol 78 (8) ◽  
pp. 1772-1781 ◽  
Author(s):  
Hyungjun (Brian) Jo ◽  
Wayne Parker ◽  
Peiman Kianmehr
Keyword(s):  
Anaerobic Digestion ◽  
Activated Sludge ◽  
Oxygen Demand ◽  
Waste Activated Sludge ◽  
Thermal Pretreatment ◽  
Decay Products ◽  
Anaerobic Biodegradability ◽  
Pretreatment Conditions ◽  
The Impact ◽  
Aerobic And Anaerobic

Abstract A range of thermal pretreatment conditions were used to evaluate the impact of high pressure thermal hydrolysis on the biodegradability of waste activated sludge (WAS) under aerobic and anaerobic conditions. It was found that pretreatment did not increase the overall extent to which WAS could be aerobically biodegraded. Thermal pretreatment transformed the biodegradable fraction of WAS (XH) to readily biodegradable chemical oxygen demand (COD) (SB) (16.5–34.6%) and slowly biodegradable COD (XB) (45.8–63.6%). The impact of pretreatment temperature and duration on WAS COD fractionation did not follow a consistent pattern as changes in COD solubilization did not correspond to the observed generation of SB through pretreatment. The pretreated WAS (PWAS) COD fractionations determined from aerobic respirometry were employed in anaerobic modeling and it was concluded that the aerobic and anaerobic biodegradability of PWAS differed. It was found that thermal pretreatment resulted in as much as 50% of the endogenous decay products becoming biodegradable in anaerobic digestion. Overall, it was concluded that the COD fractionation that was developed based upon the aerobic respirometry was valid. However, it was necessary to implement a first-order decay process that reflected changes in the anaerobic biodegradability of the endogenous products through pretreatment.

Phosphorus recovery as vivianite from waste activated sludge via optimizing iron source and pH value during anaerobic fermentation

2019 ◽  
Vol 293 ◽  
pp. 122088 ◽  
Author(s):  
Jiashun Cao ◽  
Yang Wu ◽  
Jianan Zhao ◽  
Shuo Jin ◽  
Muhammad Aleem ◽  
...  
Keyword(s):  
Activated Sludge ◽  
Ph Value ◽  
Anaerobic Fermentation ◽  
Phosphorus Recovery ◽  
Waste Activated Sludge ◽  
Iron Source
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