scholarly journals Enhancing volatile fatty acids production from waste activated sludge by a novel cation-exchange resin assistant strategy

2021 ◽  
Vol 278 ◽  
pp. 123236 ◽  
Author(s):  
Heliang Pang ◽  
Junguo He ◽  
Yingqun Ma ◽  
Xinlei Pan ◽  
Yanshi Zheng ◽  
...  
Keyword(s):  
Fatty Acids ◽  
Activated Sludge ◽  
Cation Exchange ◽  
Volatile Fatty Acids ◽  
Exchange Resin ◽  
Cation Exchange Resin ◽  
Waste Activated Sludge

Waste Activated Sludge Treated by the Cation Exchange Resin Method for Microbial Flocculant Preparation

2012 ◽  
Vol 518-523 ◽  
pp. 3585-3589 ◽  
Author(s):  
Zhi Qiang Zhang ◽  
Jiao Zhang
Keyword(s):  
Activated Sludge ◽  
Cation Exchange ◽  
Municipal Wastewater ◽  
Exchange Resin ◽  
Cation Exchange Resin ◽  
Waste Activated Sludge ◽  
Flocculating Activity ◽  
Microbial Flocculant ◽  
Stirring Intensity ◽  
Sludge Concentration

As a concomitant of wastewater biological treatment, waste activated sludge (WAS) has become a current problem due to its huge production and potential environmental pollution. In this paper, the WAS from municipal wastewater treatment plant (WWTP) treated by the cation exchange resin (CER) method for microbial flocculant (MBF) preparation was introduced. Various influencing factors, including sludge pH, sludge concentration, CER dosage, stirring intensity, and treatment time, were systematically investigated. The MBF extracted from neutral or alkalescent sludge shows higher flocculating activity than that from acid sludge. Increasing sludge concentration is beneficial to the MBF extraction. The flocculating activity of the extracted MBF can be enhanced by increasing the stirring intensity or the added CER dose. However, with extending extraction time, the flocculating activity of the extracted MBF increases and reaches to a peak, and then hold the line on the whole. Therefore, the CER method is feasible to extract MBF from excess sludge, which could provide a new way for WAS resource reuse, as well as cut down the cost of MBF preparation.

scholarly journals Volatile Fatty Acids and Biomethane Recovery from Thickened Waste Activated Sludge: Hydrothermal Pretreatment’s Retention Time Impact

Processes ◽  
2020 ◽  
Vol 8 (12) ◽  
pp. 1580
Author(s):  
Farokh laqa Kakar ◽  
Ahmed El Sayed ◽  
Neha Purohit ◽  
Elsayed Elbeshbishy
Keyword(s):  
Fatty Acids ◽  
Activated Sludge ◽  
Retention Time ◽  
Volatile Fatty Acids ◽  
Oxygen Demand ◽  
Hydrothermal Pretreatment ◽  
Waste Activated Sludge ◽  
Optimum Conditions ◽  
Pretreatment Temperature ◽  
Biomethane Production

The main objective of this study was to evaluate the hydrothermal pretreatment’s retention time influence on the volatile fatty acids and biomethane production from thickened waste activated sludge under mesophilic conditions. Six different retention times of 10, 20, 30, 40, 50, and 60 min were investigated while the hydrothermal pretreatment temperature was kept at 170 °C. The results showed that the chemical oxygen demand (COD) solubilization increased by increasing the hydrothermal pretreatment retention time up to 30 min and stabilized afterwards. The highest COD solubilization of 48% was observed for the sample pretreated at 170 °C for 30 min. Similarly, the sample pretreated at 170 °C for 30 min demonstrated the highest volatile fatty acids yield of 14.5 g COD/Lsubstrate added and a methane yield of 225 mL CH4/g TCODadded compared to 4.3 g COD/Lsubstrate added and 163 mL CH4/g TCODadded for the raw sample, respectively. The outcome of this study revealed that the optimum conditions for solubilization are not necessarily associated with the best fermentation and/or digestion performance.

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