effluent recycling
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Processes ◽  
2021 ◽  
Vol 9 (5) ◽  
pp. 878
Author(s):  
Apinya Singkhala ◽  
Chonticha Mamimin ◽  
Alissara Reungsang ◽  
Sompong O-Thong

A sudden pH drops always inhibits the anaerobic digestion (AD) reactor for biogas production from palm oil mill effluent (POME). The pH adjustment of POME by oil palm ash addition and the biogas effluent recycling effect on the preventing of pH drop and change of the archaea community was investigated. The pH adjustment of POME to 7.5 increased the methane yield two times more than raw POME (pH 4.3). The optimal dose for pH adjustment by oil palm ash addition was 5% w/v with a methane yield of 440 mL-CH4/gVS. The optimal dose for pH adjustment by biogas effluent recycling was 20% v/v with a methane yield of 351 mL-CH4/gVS. Methane production from POME in a continuous reactor with pH adjustment by 5% w/v oil palm ash and 20% v/v biogas effluent recycling was 19.1 ± 0.25 and 13.8 ± 0.3 m3 CH4/m3-POME, respectively. The pH adjustment by oil palm ash enhanced methane production for the long-term operation with the stability of pH, alkalinity, and archaea community. Oil palm ash increased the number of Methanosarcina mazei and Methanothermobacter defluvii. Oil palm ash is a cost-effective alkali material as a source of buffer and trace metals for preventing the pH drop and the increased methanogen population in the AD process.


2021 ◽  
Vol 319 ◽  
pp. 124196 ◽  
Author(s):  
Florian Paillet ◽  
Carole Barrau ◽  
Renaud Escudié ◽  
Nicolas Bernet ◽  
Eric Trably

2019 ◽  
Vol 12 (1) ◽  
pp. 91-96
Author(s):  
Stanislava Kecskésová ◽  
Zuzana Imreová ◽  
Bibiána Kožárová ◽  
Ján Derco ◽  
Miloslav Drtil

Abstract Undissociated HNO2 (up to 2 mg dm−3) was confirmed as substrate inhibitor for granular biomass from a denitritation upflow sludge bed reactor used for biological removal of nitrite. On the contrary, total nitrite nitrogen (N-NO2 up to 500 mg dm−3) and methanol (COD up to 2000 mg dm−3) were not proven to be inhibitors. pH also affected the denitritation efficiency (optimal pH was 5.9). Reduction of HNO2 concentration in the reactor by effluent recycling is recommended.


2017 ◽  
Vol 332 ◽  
pp. 96-104 ◽  
Author(s):  
A. Michau ◽  
F. Maury ◽  
F. Schuster ◽  
R. Boichot ◽  
M. Pons ◽  
...  

2017 ◽  
Vol 161 ◽  
pp. 792-802 ◽  
Author(s):  
Ruth Sánchez-Hernández ◽  
Isabel Padilla ◽  
Sol López-Andrés ◽  
Aurora López-Delgado

2016 ◽  
Vol 39 (2) ◽  
pp. 335-342 ◽  
Author(s):  
Sherif Elsayed ◽  
Nikolaos Boukis ◽  
Dominik Patzelt ◽  
Stefan Hindersin ◽  
Martin Kerner ◽  
...  

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